New MP4 muxer + Queue changes + Storage fixes

Main changes:
* correctly check the available space (CircularFile.java)
* misc cleanup (CircularFile.java)
* use the "Error Reporter" for non-http errors
* rewrite network state checking and add better support for API 21 (Lollipop) or higher
* implement "metered networks"
* add buttons in "Downloads" activity to start/pause all pending downloads, ignoring the queue flag or if the network is "metered"
* add workaround for VPN connections and/or network switching. Example: switching WiFi to 3G
* rewrite DataReader ¡Webm muxer is now 57% more faster!
* rewrite CircularFile, use file buffers instead of memory buffers. Less troubles in low-end devices
* fix missing offset for KaxCluster (WebMWriter.java), manifested as no thumbnails on file explorers

Download queue:
* remember queue status, unless the user pause the download (un-queue)
* semi-automatic downloads, between networks. Effective if the user create a new download or the downloads activity is starts
* allow enqueue failed downloads
* new option, queue limit, enabled by default. Used to allow one or multiple downloads at same time

Miscellaneous:
* fix crash while selecting details/error menu (mistake on MissionFragment.java)
* misc serialize changes (DownloadMission.java)
* minor UI tweaks
* allow overwrite paused downloads
* fix wrong icons for grid/list button in downloads
* add share option
* implement #2006
* correct misspelled word in strings.xml (es) (cmn)
* fix MissionAdapter crash during device shutdown

New Mp4Muxer + required changes:
* new mp4 muxer (from dash only) with this, muxing on Android 7 is possible now!!!
* re-work in SharpStream
* drop mp4 dash muxer
* misc changes: add warning in SecondaryStreamHelper.java,
* strip m4a DASH files to normal m4a format (youtube only)

Fix storage issues:
* warn to the user if is choosing a "read only" download directory (for external SD Cards), useless is rooted :)
* "write proof" allow post-processing resuming only if the device ran out of space
* implement "insufficient storage" error for downloads

app/src/main/java/org/schabi/newpipe/download/DownloadDialog.java

@@ -7,6 +7,7 @@ import android.preference.PreferenceManager;
 import android.support.annotation.IdRes;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
+import android.support.annotation.StringRes;
 import android.support.v4.app.DialogFragment;
 import android.support.v7.app.AlertDialog;
 import android.support.v7.widget.Toolbar;
@@ -52,6 +53,7 @@ import icepick.State;
 import io.reactivex.disposables.CompositeDisposable;
 import us.shandian.giga.postprocessing.Postprocessing;
 import us.shandian.giga.service.DownloadManagerService;
+import us.shandian.giga.service.DownloadManagerService.MissionCheck;
 
 public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheckedChangeListener, AdapterView.OnItemSelectedListener {
     private static final String TAG = "DialogFragment";
@@ -263,7 +265,7 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
     }
 
     @Override
-    public void onSaveInstanceState(Bundle outState) {
+    public void onSaveInstanceState(@NonNull Bundle outState) {
         super.onSaveInstanceState(outState);
         Icepick.saveInstanceState(this, outState);
     }
@@ -476,23 +478,40 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
 
         final String finalFileName = fileName;
 
-        DownloadManagerService.checkForRunningMission(context, location, fileName, (listed, finished) -> {
+        DownloadManagerService.checkForRunningMission(context, location, fileName, (MissionCheck result) -> {
-            if (listed) {
+            @StringRes int msgBtn;
+            @StringRes int msgBody;
+
+            switch (result) {
+                case Finished:
+                    msgBtn = R.string.overwrite;
+                    msgBody = R.string.overwrite_warning;
+                    break;
+                case Pending:
+                    msgBtn = R.string.overwrite;
+                    msgBody = R.string.download_already_pending;
+                    break;
+                case PendingRunning:
+                    msgBtn = R.string.generate_unique_name;
+                    msgBody = R.string.download_already_running;
+                    break;
+                default:
+                    downloadSelected(context, stream, location, finalFileName, kind, threads);
+                    return;
+            }
+
+            // overwrite or unique name actions are done by the download manager
+
             AlertDialog.Builder builder = new AlertDialog.Builder(context);
             builder.setTitle(R.string.download_dialog_title)
-                        .setMessage(finished ? R.string.overwrite_warning : R.string.download_already_running)
+                    .setMessage(msgBody)
                     .setPositiveButton(
-                                finished ? R.string.overwrite : R.string.generate_unique_name,
+                            msgBtn,
                             (dialog, which) -> downloadSelected(context, stream, location, finalFileName, kind, threads)
                     )
-                        .setNegativeButton(android.R.string.cancel, (dialog, which) -> {
+                    .setNegativeButton(android.R.string.cancel, (dialog, which) -> dialog.cancel())
-                            dialog.cancel();
-                        })
                     .create()
                     .show();
-            } else {
-                downloadSelected(context, stream, location, finalFileName, kind, threads);
-            }
         });
     }
 
@@ -503,14 +522,18 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
         String secondaryStreamUrl = null;
         long nearLength = 0;
 
-        if (selectedStream instanceof VideoStream) {
+        if (selectedStream instanceof AudioStream) {
+            if (selectedStream.getFormat() == MediaFormat.M4A) {
+                psName = Postprocessing.ALGORITHM_M4A_NO_DASH;
+            }
+        } else if (selectedStream instanceof VideoStream) {
             SecondaryStreamHelper<AudioStream> secondaryStream = videoStreamsAdapter
                     .getAllSecondary()
                     .get(wrappedVideoStreams.getStreamsList().indexOf(selectedStream));
 
             if (secondaryStream != null) {
                 secondaryStreamUrl = secondaryStream.getStream().getUrl();
-                psName = selectedStream.getFormat() == MediaFormat.MPEG_4 ? Postprocessing.ALGORITHM_MP4_MUXER : Postprocessing.ALGORITHM_WEBM_MUXER;
+                psName = selectedStream.getFormat() == MediaFormat.MPEG_4 ? Postprocessing.ALGORITHM_MP4_FROM_DASH_MUXER : Postprocessing.ALGORITHM_WEBM_MUXER;
                 psArgs = null;
                 long videoSize = wrappedVideoStreams.getSizeInBytes((VideoStream) selectedStream);
 

app/src/main/java/org/schabi/newpipe/report/UserAction.java

@@ -17,7 +17,9 @@ public enum UserAction {
     REQUESTED_KIOSK("requested kiosk"),
     REQUESTED_COMMENTS("requested comments"),
     DELETE_FROM_HISTORY("delete from history"),
-    PLAY_STREAM("Play stream");
+    PLAY_STREAM("Play stream"),
+    DOWNLOAD_POSTPROCESSING("download post-processing"),
+    DOWNLOAD_FAILED("download failed");
 
 
     private final String message;

app/src/main/java/org/schabi/newpipe/settings/DownloadSettingsFragment.java

@@ -1,6 +1,7 @@
 package org.schabi.newpipe.settings;
 
 import android.app.Activity;
+import android.app.AlertDialog;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
@@ -12,6 +13,8 @@ import com.nononsenseapps.filepicker.Utils;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.util.FilePickerActivityHelper;
 
+import java.io.File;
+
 public class DownloadSettingsFragment extends BasePreferenceFragment {
     private static final int REQUEST_DOWNLOAD_PATH = 0x1235;
     private static final int REQUEST_DOWNLOAD_AUDIO_PATH = 0x1236;
@@ -78,6 +81,15 @@ public class DownloadSettingsFragment extends BasePreferenceFragment {
 
             defaultPreferences.edit().putString(key, path).apply();
             updatePreferencesSummary();
+
+            File target = new File(path);
+            if (!target.canWrite()) {
+                AlertDialog.Builder msg = new AlertDialog.Builder(getContext());
+                msg.setTitle(R.string.download_to_sdcard_error_title);
+                msg.setMessage(R.string.download_to_sdcard_error_message);
+                msg.setPositiveButton(android.R.string.ok, (dialogInterface, i) -> { });
+                msg.show();
+            }
         }
     }
 }

app/src/main/java/org/schabi/newpipe/streams/DataReader.java

@@ -1,9 +1,10 @@
 package org.schabi.newpipe.streams;
 
+import org.schabi.newpipe.streams.io.SharpStream;
+
 import java.io.EOFException;
 import java.io.IOException;
-
+import java.io.InputStream;
-import org.schabi.newpipe.streams.io.SharpStream;
 
 /**
  * @author kapodamy
@@ -15,89 +16,237 @@ public class DataReader {
     public final static int INTEGER_SIZE = 4;
     public final static int FLOAT_SIZE = 4;
 
-    private long pos;
+    private long position = 0;
-    public final SharpStream stream;
+    private final SharpStream stream;
-    private final boolean rewind;
+
+    private InputStream view;
+    private int viewSize;
 
     public DataReader(SharpStream stream) {
-        this.rewind = stream.canRewind();
         this.stream = stream;
-        this.pos = 0L;
+        this.readOffset = this.readBuffer.length;
     }
 
     public long position() {
-        return pos;
+        return position;
     }
 
-    public final int readInt() throws IOException {
+    public int read() throws IOException {
+        if (fillBuffer()) {
+            return -1;
+        }
+
+        position++;
+        readCount--;
+
+        return readBuffer[readOffset++] & 0xFF;
+    }
+
+    public long skipBytes(long amount) throws IOException {
+        if (readCount < 0) {
+            return 0;
+        } else if (readCount == 0) {
+            amount = stream.skip(amount);
+        } else {
+            if (readCount > amount) {
+                readCount -= (int) amount;
+                readOffset += (int) amount;
+            } else {
+                amount = readCount + stream.skip(amount - readCount);
+                readCount = 0;
+                readOffset = readBuffer.length;
+            }
+        }
+
+        position += amount;
+        return amount;
+    }
+
+    public int readInt() throws IOException {
         primitiveRead(INTEGER_SIZE);
         return primitive[0] << 24 | primitive[1] << 16 | primitive[2] << 8 | primitive[3];
     }
 
-    public final int read() throws IOException {
+    public short readShort() throws IOException {
-        int value = stream.read();
+        primitiveRead(SHORT_SIZE);
-        if (value == -1) {
+        return (short) (primitive[0] << 8 | primitive[1]);
-            throw new EOFException();
     }
 
-        pos++;
+    public long readLong() throws IOException {
-        return value;
-    }
-
-    public final long skipBytes(long amount) throws IOException {
-        amount = stream.skip(amount);
-        pos += amount;
-        return amount;
-    }
-
-    public final long readLong() throws IOException {
         primitiveRead(LONG_SIZE);
         long high = primitive[0] << 24 | primitive[1] << 16 | primitive[2] << 8 | primitive[3];
         long low = primitive[4] << 24 | primitive[5] << 16 | primitive[6] << 8 | primitive[7];
         return high << 32 | low;
     }
 
-    public final short readShort() throws IOException {
+    public int read(byte[] buffer) throws IOException {
-        primitiveRead(SHORT_SIZE);
-        return (short) (primitive[0] << 8 | primitive[1]);
-    }
-
-    public final int read(byte[] buffer) throws IOException {
         return read(buffer, 0, buffer.length);
     }
 
-    public final int read(byte[] buffer, int offset, int count) throws IOException {
+    public int read(byte[] buffer, int offset, int count) throws IOException {
-        int res = stream.read(buffer, offset, count);
+        if (readCount < 0) {
-        pos += res;
+            return -1;
+        }
+        int total = 0;
 
-        return res;
+        if (count >= readBuffer.length) {
+            if (readCount > 0) {
+                System.arraycopy(readBuffer, readOffset, buffer, offset, readCount);
+                readOffset += readCount;
+
+                offset += readCount;
+                count -= readCount;
+
+                total = readCount;
+                readCount = 0;
+            }
+            total += Math.max(stream.read(buffer, offset, count), 0);
+        } else {
+            while (count > 0 && !fillBuffer()) {
+                int read = Math.min(readCount, count);
+                System.arraycopy(readBuffer, readOffset, buffer, offset, read);
+
+                readOffset += read;
+                readCount -= read;
+
+                offset += read;
+                count -= read;
+
+                total += read;
+            }
         }
 
-    public final boolean available() {
+        position += total;
-        return stream.available() > 0;
+        return total;
+    }
+
+    public boolean available() {
+        return readCount > 0 || stream.available() > 0;
     }
 
     public void rewind() throws IOException {
         stream.rewind();
-        pos = 0;
+
+        if ((position - viewSize) > 0) {
+            viewSize = 0;// drop view
+        } else {
+            viewSize += position;
+        }
+
+        position = 0;
+        readOffset = readBuffer.length;
     }
 
     public boolean canRewind() {
-        return rewind;
+        return stream.canRewind();
     }
 
-    private short[] primitive = new short[LONG_SIZE];
+    /**
+     * Wraps this instance of {@code DataReader} into {@code InputStream}
+     * object. Note: Any read in the {@code DataReader} will not modify
+     * (decrease) the view size
+     *
+     * @param size the size of the view
+     * @return the view
+     */
+    public InputStream getView(int size) {
+        if (view == null) {
+            view = new InputStream() {
+                @Override
+                public int read() throws IOException {
+                    if (viewSize < 1) {
+                        return -1;
+                    }
+                    int res = DataReader.this.read();
+                    if (res > 0) {
+                        viewSize--;
+                    }
+                    return res;
+                }
+
+                @Override
+                public int read(byte[] buffer) throws IOException {
+                    return read(buffer, 0, buffer.length);
+                }
+
+                @Override
+                public int read(byte[] buffer, int offset, int count) throws IOException {
+                    if (viewSize < 1) {
+                        return -1;
+                    }
+
+                    int res = DataReader.this.read(buffer, offset, Math.min(viewSize, count));
+                    viewSize -= res;
+
+                    return res;
+                }
+
+                @Override
+                public long skip(long amount) throws IOException {
+                    if (viewSize < 1) {
+                        return 0;
+                    }
+                    int res = (int) DataReader.this.skipBytes(Math.min(amount, viewSize));
+                    viewSize -= res;
+
+                    return res;
+                }
+
+                @Override
+                public int available() {
+                    return viewSize;
+                }
+
+                @Override
+                public void close() {
+                    viewSize = 0;
+                }
+
+                @Override
+                public boolean markSupported() {
+                    return false;
+                }
+
+            };
+        }
+        viewSize = size;
+
+        return view;
+    }
+
+    private final short[] primitive = new short[LONG_SIZE];
 
     private void primitiveRead(int amount) throws IOException {
         byte[] buffer = new byte[amount];
-        int read = stream.read(buffer, 0, amount);
+        int read = read(buffer, 0, amount);
-        pos += read;
+
         if (read != amount) {
-            throw new EOFException("Truncated data, missing " + String.valueOf(amount - read) + " bytes");
+            throw new EOFException("Truncated stream, missing " + String.valueOf(amount - read) + " bytes");
         }
 
-        for (int i = 0; i < buffer.length; i++) {
+        for (int i = 0; i < amount; i++) {
-            primitive[i] = (short) (buffer[i] & 0xFF);// the "byte" datatype is signed and is very annoying
+            primitive[i] = (short) (buffer[i] & 0xFF);// the "byte" data type in java is signed and is very annoying
         }
     }
+
+    private final byte[] readBuffer = new byte[8 * 1024];
+    private int readOffset;
+    private int readCount;
+
+    private boolean fillBuffer() throws IOException {
+        if (readCount < 0) {
+            return true;
+        }
+        if (readOffset >= readBuffer.length) {
+            readCount = stream.read(readBuffer);
+            if (readCount < 1) {
+                readCount = -1;
+                return true;
+            }
+            readOffset = 0;
+        }
+
+        return readCount < 1;
+    }
+
 }

app/src/main/java/org/schabi/newpipe/streams/Mp4DashReader.java

@@ -1,17 +1,15 @@
 package org.schabi.newpipe.streams;
 
+import org.schabi.newpipe.streams.io.SharpStream;
+
 import java.io.EOFException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.UnsupportedEncodingException;
-
 import java.nio.ByteBuffer;
-
 import java.util.ArrayList;
 import java.util.NoSuchElementException;
 
-import org.schabi.newpipe.streams.io.SharpStream;
-
 /**
  * @author kapodamy
  */
@@ -35,14 +33,29 @@ public class Mp4DashReader {
     private static final int ATOM_TREX = 0x74726578;
     private static final int ATOM_TKHD = 0x746B6864;
     private static final int ATOM_MFRA = 0x6D667261;
-    private static final int ATOM_TFRA = 0x74667261;
     private static final int ATOM_MDHD = 0x6D646864;
+    private static final int ATOM_EDTS = 0x65647473;
+    private static final int ATOM_ELST = 0x656C7374;
+    private static final int ATOM_HDLR = 0x68646C72;
+    private static final int ATOM_MINF = 0x6D696E66;
+    private static final int ATOM_DINF = 0x64696E66;
+    private static final int ATOM_STBL = 0x7374626C;
+    private static final int ATOM_STSD = 0x73747364;
+    private static final int ATOM_VMHD = 0x766D6864;
+    private static final int ATOM_SMHD = 0x736D6864;
+
     private static final int BRAND_DASH = 0x64617368;
+    private static final int BRAND_ISO5 = 0x69736F35;
+
+    private static final int HANDLER_VIDE = 0x76696465;
+    private static final int HANDLER_SOUN = 0x736F756E;
+    private static final int HANDLER_SUBT = 0x73756274;
     // </editor-fold>
 
     private final DataReader stream;
 
     private Mp4Track[] tracks = null;
+    private int[] brands = null;
 
     private Box box;
     private Moof moof;
@@ -50,9 +63,10 @@ public class Mp4DashReader {
     private boolean chunkZero = false;
 
     private int selectedTrack = -1;
+    private Box backupBox = null;
 
     public enum TrackKind {
-        Audio, Video, Other
+        Audio, Video, Subtitles, Other
     }
 
     public Mp4DashReader(SharpStream source) {
@@ -65,8 +79,15 @@ public class Mp4DashReader {
         }
 
         box = readBox(ATOM_FTYP);
-        if (parse_ftyp() != BRAND_DASH) {
+        brands = parse_ftyp(box);
-            throw new NoSuchElementException("Main Brand is not dash");
+        switch (brands[0]) {
+            case BRAND_DASH:
+            case BRAND_ISO5:// ¿why not?
+                break;
+            default:
+                throw new NoSuchElementException(
+                        "Not a MPEG-4 DASH container, major brand is not 'dash' or 'iso5' is " + boxName(brands[0])
+                );
         }
 
         Moov moov = null;
@@ -84,8 +105,6 @@ public class Mp4DashReader {
                     break;
                 case ATOM_MFRA:
                     break;
-                case ATOM_MDAT:
-                    throw new IOException("Expected moof, found mdat");
             }
         }
 
@@ -107,15 +126,26 @@ public class Mp4DashReader {
                 }
             }
 
-            if (moov.trak[i].tkhd.bHeight == 0 && moov.trak[i].tkhd.bWidth == 0) {
+            switch (moov.trak[i].mdia.hdlr.subType) {
-                tracks[i].kind = moov.trak[i].tkhd.bVolume == 0 ? TrackKind.Other : TrackKind.Audio;
+                case HANDLER_VIDE:
-            } else {
                     tracks[i].kind = TrackKind.Video;
-            }
+                    break;
+                case HANDLER_SOUN:
+                    tracks[i].kind = TrackKind.Audio;
+                    break;
+                case HANDLER_SUBT:
+                    tracks[i].kind = TrackKind.Subtitles;
+                    break;
+                default:
+                    tracks[i].kind = TrackKind.Other;
+                    break;
             }
         }
 
-    public Mp4Track selectTrack(int index) {
+        backupBox = box;
+    }
+
+    Mp4Track selectTrack(int index) {
         selectedTrack = index;
         return tracks[index];
     }
@@ -126,7 +156,7 @@ public class Mp4DashReader {
      * @return list with a basic info
      * @throws IOException if the source stream is not seekeable
      */
-    public int getFragmentsCount() throws IOException {
+    int getFragmentsCount() throws IOException {
         if (selectedTrack < 0) {
             throw new IllegalStateException("track no selected");
         }
@@ -136,7 +166,6 @@ public class Mp4DashReader {
 
         Box tmp;
         int count = 0;
-        long orig_offset = stream.position();
 
         if (box.type == ATOM_MOOF) {
             tmp = box;
@@ -162,17 +191,36 @@ public class Mp4DashReader {
             ensure(tmp);
         } while (stream.available() && (tmp = readBox()) != null);
 
-        stream.rewind();
+        rewind();
-        stream.skipBytes((int) orig_offset);
 
         return count;
     }
 
+    public int[] getBrands() {
+        if (brands == null) throw new IllegalStateException("Not parsed");
+        return brands;
+    }
+
+    public void rewind() throws IOException {
+        if (!stream.canRewind()) {
+            throw new IOException("The provided stream doesn't allow seek");
+        }
+        if (box == null) {
+            return;
+        }
+
+        box = backupBox;
+        chunkZero = false;
+
+        stream.rewind();
+        stream.skipBytes(backupBox.offset + (DataReader.INTEGER_SIZE * 2));
+    }
+
     public Mp4Track[] getAvailableTracks() {
         return tracks;
     }
 
-    public Mp4TrackChunk getNextChunk() throws IOException {
+    public Mp4DashChunk getNextChunk(boolean infoOnly) throws IOException {
         Mp4Track track = tracks[selectedTrack];
 
         while (stream.available()) {
@@ -208,7 +256,7 @@ public class Mp4DashReader {
                             if (hasFlag(moof.traf.tfhd.bFlags, 0x10)) {
                                 moof.traf.trun.chunkSize = moof.traf.tfhd.defaultSampleSize * moof.traf.trun.entryCount;
                             } else {
-                                moof.traf.trun.chunkSize = box.size - 8;
+                                moof.traf.trun.chunkSize = (int) (box.size - 8);
                             }
                         }
                         if (!hasFlag(moof.traf.trun.bFlags, 0x900) && moof.traf.trun.chunkDuration == 0) {
@@ -228,9 +276,12 @@ public class Mp4DashReader {
                         continue;// find another chunk
                     }
 
-                    Mp4TrackChunk chunk = new Mp4TrackChunk();
+                    Mp4DashChunk chunk = new Mp4DashChunk();
                     chunk.moof = moof;
-                    chunk.data = new TrackDataChunk(stream, moof.traf.trun.chunkSize);
+                    if (!infoOnly) {
+                        chunk.data = stream.getView(moof.traf.trun.chunkSize);
+                    }
+
                     moof = null;
 
                     stream.skipBytes(chunk.moof.traf.trun.dataOffset);
@@ -269,6 +320,10 @@ public class Mp4DashReader {
         b.size = stream.readInt();
         b.type = stream.readInt();
 
+        if (b.size == 1) {
+            b.size = stream.readLong();
+        }
+
         return b;
     }
 
@@ -280,6 +335,25 @@ public class Mp4DashReader {
         return b;
     }
 
+    private byte[] readFullBox(Box ref) throws IOException {
+        // full box reading is limited to 2 GiB, and should be enough
+        int size = (int) ref.size;
+
+        ByteBuffer buffer = ByteBuffer.allocate(size);
+        buffer.putInt(size);
+        buffer.putInt(ref.type);
+
+        int read = size - 8;
+
+        if (stream.read(buffer.array(), 8, read) != read) {
+            throw new EOFException(
+                    String.format("EOF reached in box: type=%s offset=%s size=%s", boxName(ref.type), ref.offset, ref.size)
+            );
+        }
+
+        return buffer.array();
+    }
+
     private void ensure(Box ref) throws IOException {
         long skip = ref.offset + ref.size - stream.position();
 
@@ -310,6 +384,14 @@ public class Mp4DashReader {
         return null;
     }
 
+    private Box untilAnyBox(Box ref) throws IOException {
+        if (stream.position() >= (ref.offset + ref.size)) {
+            return null;
+        }
+
+        return readBox();
+    }
+
     // </editor-fold>
 
     // <editor-fold defaultState="collapsed" desc="Box readers">
@@ -448,11 +530,18 @@ public class Mp4DashReader {
         return obj;
     }
 
-    private int parse_ftyp() throws IOException {
+    private int[] parse_ftyp(Box ref) throws IOException {
-        int brand = stream.readInt();
+        int i = 0;
+        int[] list = new int[(int) ((ref.offset + ref.size - stream.position() - 4) / 4)];
+
+        list[i++] = stream.readInt();// major brand
+
         stream.skipBytes(4);// minor version
 
-        return brand;
+        for (; i < list.length; i++)
+            list[i] = stream.readInt();// compatible brands
+
+        return list;
     }
 
     private Mvhd parse_mvhd() throws IOException {
@@ -521,32 +610,66 @@ public class Mp4DashReader {
         trak.tkhd = parse_tkhd();
         ensure(b);
 
-        b = untilBox(ref, ATOM_MDIA);
+        while ((b = untilBox(ref, ATOM_MDIA, ATOM_EDTS)) != null) {
-        trak.mdia = new byte[b.size];
+            switch (b.type) {
+                case ATOM_MDIA:
+                    trak.mdia = parse_mdia(b);
+                    break;
+                case ATOM_EDTS:
+                    trak.edst_elst = parse_edts(b);
+                    break;
+            }
 
-        ByteBuffer buffer = ByteBuffer.wrap(trak.mdia);
+            ensure(b);
-        buffer.putInt(b.size);
+        }
-        buffer.putInt(ATOM_MDIA);
-        stream.read(trak.mdia, 8, b.size - 8);
-
-        trak.mdia_mdhd_timeScale = parse_mdia(buffer);
 
         return trak;
     }
 
-    private int parse_mdia(ByteBuffer data) {
+    private Mdia parse_mdia(Box ref) throws IOException {
-        while (data.hasRemaining()) {
+        Mdia obj = new Mdia();
-            int end = data.position() + data.getInt();
+
-            if (data.getInt() == ATOM_MDHD) {
+        Box b;
-                byte version = data.get();
+        while ((b = untilBox(ref, ATOM_MDHD, ATOM_HDLR, ATOM_MINF)) != null) {
-                data.position(data.position() + 3 + ((version == 0 ? 4 : 8) * 2));
+            switch (b.type) {
-                return data.getInt();
+                case ATOM_MDHD:
+                    obj.mdhd = readFullBox(b);
+
+                    // read time scale
+                    ByteBuffer buffer = ByteBuffer.wrap(obj.mdhd);
+                    byte version = buffer.get(8);
+                    buffer.position(12 + ((version == 0 ? 4 : 8) * 2));
+                    obj.mdhd_timeScale = buffer.getInt();
+                    break;
+                case ATOM_HDLR:
+                    obj.hdlr = parse_hdlr(b);
+                    break;
+                case ATOM_MINF:
+                    obj.minf = parse_minf(b);
+                    break;
+            }
+            ensure(b);
         }
 
-            data.position(end);
+        return obj;
     }
 
-        return 0;// this NEVER should happen
+    private Hdlr parse_hdlr(Box ref) throws IOException {
+        // version
+        // flags
+        stream.skipBytes(4);
+
+        Hdlr obj = new Hdlr();
+        obj.bReserved = new byte[12];
+
+        obj.type = stream.readInt();
+        obj.subType = stream.readInt();
+        stream.read(obj.bReserved);
+
+        // component name (is a ansi/ascii string)
+        stream.skipBytes((ref.offset + ref.size) - stream.position());
+
+        return obj;
     }
 
     private Moov parse_moov(Box ref) throws IOException {
@@ -570,7 +693,7 @@ public class Mp4DashReader {
             ensure(b);
         }
 
-        moov.trak = tmp.toArray(new Trak[tmp.size()]);
+        moov.trak = tmp.toArray(new Trak[0]);
 
         return moov;
     }
@@ -584,7 +707,7 @@ public class Mp4DashReader {
             ensure(b);
         }
 
-        return tmp.toArray(new Trex[tmp.size()]);
+        return tmp.toArray(new Trex[0]);
     }
 
     private Trex parse_trex() throws IOException {
@@ -602,74 +725,74 @@ public class Mp4DashReader {
         return obj;
     }
 
-    private Tfra parse_tfra() throws IOException {
+    private Elst parse_edts(Box ref) throws IOException {
-        int version = stream.read();
+        Box b = untilBox(ref, ATOM_ELST);
-
+        if (b == null) {
-        stream.skipBytes(3);// flags
+            return null;
-
-        Tfra tfra = new Tfra();
-        tfra.trackId = stream.readInt();
-
-        stream.skipBytes(3);// reserved
-        int bFlags = stream.read();
-        int size_tts = ((bFlags >> 4) & 3) + ((bFlags >> 2) & 3) + (bFlags & 3);
-
-        tfra.entries_time = new int[stream.readInt()];
-
-        for (int i = 0; i < tfra.entries_time.length; i++) {
-            tfra.entries_time[i] = version == 0 ? stream.readInt() : (int) stream.readLong();
-            stream.skipBytes(size_tts + (version == 0 ? 4 : 8));
         }
 
-        return tfra;
+        Elst obj = new Elst();
-    }
-
-    private Sidx parse_sidx() throws IOException {
-        int version = stream.read();
 
+        boolean v1 = stream.read() == 1;
         stream.skipBytes(3);// flags
 
-        Sidx obj = new Sidx();
+        int entryCount = stream.readInt();
-        obj.referenceId = stream.readInt();
+        if (entryCount < 1) {
-        obj.timescale = stream.readInt();
+            obj.bMediaRate = 0x00010000;// default media rate (1.0)
+            return obj;
+        }
 
-        // earliest presentation entries_time
+        if (v1) {
-        // first offset
+            stream.skipBytes(DataReader.LONG_SIZE);// segment duration
-        // reserved
+            obj.MediaTime = stream.readLong();
-        stream.skipBytes((2 * (version == 0 ? 4 : 8)) + 2);
+            // ignore all remain entries
+            stream.skipBytes((entryCount - 1) * (DataReader.LONG_SIZE * 2));
+        } else {
+            stream.skipBytes(DataReader.INTEGER_SIZE);// segment duration
+            obj.MediaTime = stream.readInt();
+        }
 
-        obj.entries_subsegmentDuration = new int[stream.readShort()];
+        obj.bMediaRate = stream.readInt();
 
-        for (int i = 0; i < obj.entries_subsegmentDuration.length; i++) {
+        return obj;
-            // reference type
+    }
-            // referenced size
-            stream.skipBytes(4);
-            obj.entries_subsegmentDuration[i] = stream.readInt();// unsigned int
 
-            // starts with SAP
+    private Minf parse_minf(Box ref) throws IOException {
-            // SAP type
+        Minf obj = new Minf();
-            // SAP delta entries_time
+
-            stream.skipBytes(4);
+        Box b;
+        while ((b = untilAnyBox(ref)) != null) {
+
+            switch (b.type) {
+                case ATOM_DINF:
+                    obj.dinf = readFullBox(b);
+                    break;
+                case ATOM_STBL:
+                    obj.stbl_stsd = parse_stbl(b);
+                    break;
+                case ATOM_VMHD:
+                case ATOM_SMHD:
+                    obj.$mhd = readFullBox(b);
+                    break;
+
+            }
+            ensure(b);
         }
 
         return obj;
     }
 
-    private Tfra[] parse_mfra(Box ref, int trackCount) throws IOException {
+    /**
-        ArrayList<Tfra> tmp = new ArrayList<>(trackCount);
+     * this only read the "stsd" box inside
-        long limit = ref.offset + ref.size;
+     */
+    private byte[] parse_stbl(Box ref) throws IOException {
+        Box b = untilBox(ref, ATOM_STSD);
 
-        while (stream.position() < limit) {
+        if (b == null) {
-            box = readBox();
+            return new byte[0];// this never should happens (missing codec startup data)
-
-            if (box.type == ATOM_TFRA) {
-                tmp.add(parse_tfra());
         }
 
-            ensure(box);
+        return readFullBox(b);
-        }
-
-        return tmp.toArray(new Tfra[tmp.size()]);
     }
 
     // </editor-fold>
@@ -679,14 +802,7 @@ public class Mp4DashReader {
 
         int type;
         long offset;
-        int size;
+        long size;
-    }
-
-    class Sidx {
-
-        int timescale;
-        int referenceId;
-        int[] entries_subsegmentDuration;
     }
 
     public class Moof {
@@ -711,12 +827,16 @@ public class Mp4DashReader {
         int defaultSampleFlags;
     }
 
-    public class TrunEntry {
+    class TrunEntry {
+
+        int sampleDuration;
+        int sampleSize;
+        int sampleFlags;
+        int sampleCompositionTimeOffset;
+
+        boolean hasCompositionTimeOffset;
+        boolean isKeyframe;
 
-        public int sampleDuration;
-        public int sampleSize;
-        public int sampleFlags;
-        public int sampleCompositionTimeOffset;
     }
 
     public class Trun {
@@ -749,6 +869,31 @@ public class Mp4DashReader {
                 entry.sampleCompositionTimeOffset = buffer.getInt();
             }
 
+            entry.hasCompositionTimeOffset = hasFlag(bFlags, 0x0800);
+            entry.isKeyframe = !hasFlag(entry.sampleFlags, 0x10000);
+
+            return entry;
+        }
+
+        public TrunEntry getAbsoluteEntry(int i, Tfhd header) {
+            TrunEntry entry = getEntry(i);
+
+            if (!hasFlag(bFlags, 0x0100) && hasFlag(header.bFlags, 0x20)) {
+                entry.sampleFlags = header.defaultSampleFlags;
+            }
+
+            if (!hasFlag(bFlags, 0x0200) && hasFlag(header.bFlags, 0x10)) {
+                entry.sampleSize = header.defaultSampleSize;
+            }
+
+            if (!hasFlag(bFlags, 0x0100) && hasFlag(header.bFlags, 0x08)) {
+                entry.sampleDuration = header.defaultSampleDuration;
+            }
+
+            if (i == 0 && hasFlag(bFlags, 0x0004)) {
+                entry.sampleFlags = bFirstSampleFlags;
+            }
+
             return entry;
         }
     }
@@ -768,9 +913,9 @@ public class Mp4DashReader {
     public class Trak {
 
         public Tkhd tkhd;
-        public int mdia_mdhd_timeScale;
+        public Elst edst_elst;
+        public Mdia mdia;
 
-        byte[] mdia;
     }
 
     class Mvhd {
@@ -786,12 +931,6 @@ public class Mp4DashReader {
         Trex[] mvex_trex;
     }
 
-    class Tfra {
-
-        int trackId;
-        int[] entries_time;
-    }
-
     public class Trex {
 
         private int trackId;
@@ -801,6 +940,34 @@ public class Mp4DashReader {
         int defaultSampleFlags;
     }
 
+    public class Elst {
+
+        public long MediaTime;
+        public int bMediaRate;
+    }
+
+    public class Mdia {
+
+        public int mdhd_timeScale;
+        public byte[] mdhd;
+        public Hdlr hdlr;
+        public Minf minf;
+    }
+
+    public class Hdlr {
+
+        public int type;
+        public int subType;
+        public byte[] bReserved;
+    }
+
+    public class Minf {
+
+        public byte[] dinf;
+        public byte[] stbl_stsd;
+        public byte[] $mhd;
+    }
+
     public class Mp4Track {
 
         public TrackKind kind;
@@ -808,10 +975,43 @@ public class Mp4DashReader {
         public Trex trex;
     }
 
-    public class Mp4TrackChunk {
+    public class Mp4DashChunk {
 
         public InputStream data;
         public Moof moof;
+        private int i = 0;
+
+        public TrunEntry getNextSampleInfo() {
+            if (i >= moof.traf.trun.entryCount) {
+                return null;
+            }
+            return moof.traf.trun.getAbsoluteEntry(i++, moof.traf.tfhd);
+        }
+
+        public Mp4DashSample getNextSample() throws IOException {
+            if (data == null) {
+                throw new IllegalStateException("This chunk has info only");
+            }
+            if (i >= moof.traf.trun.entryCount) {
+                return null;
+            }
+
+            Mp4DashSample sample = new Mp4DashSample();
+            sample.info = moof.traf.trun.getAbsoluteEntry(i++, moof.traf.tfhd);
+            sample.data = new byte[sample.info.sampleSize];
+
+            if (data.read(sample.data) != sample.info.sampleSize) {
+                throw new EOFException("EOF reached while reading a sample");
+            }
+
+            return sample;
+        }
+    }
+
+    public class Mp4DashSample {
+
+        public TrunEntry info;
+        public byte[] data;
     }
 //</editor-fold>
 }

app/src/main/java/org/schabi/newpipe/streams/Mp4DashWriter.java

@@ -1,623 +0,0 @@
-package org.schabi.newpipe.streams;
-
-import org.schabi.newpipe.streams.io.SharpStream;
-
-import org.schabi.newpipe.streams.Mp4DashReader.Mp4Track;
-import org.schabi.newpipe.streams.Mp4DashReader.Mp4TrackChunk;
-import org.schabi.newpipe.streams.Mp4DashReader.Trak;
-import org.schabi.newpipe.streams.Mp4DashReader.Trex;
-
-
-import java.io.IOException;
-import java.nio.ByteBuffer;
-import java.util.ArrayList;
-import java.util.List;
-
-import static org.schabi.newpipe.streams.Mp4DashReader.hasFlag;
-
-/**
- *
- * @author kapodamy
- */
-public class Mp4DashWriter {
-
-    private final static byte DIMENSIONAL_FIVE = 5;
-    private final static byte DIMENSIONAL_TWO = 2;
-    private final static short DEFAULT_TIMESCALE = 1000;
-    private final static int BUFFER_SIZE = 8 * 1024;
-    private final static byte DEFAULT_TREX_SIZE = 32;
-    private final static byte[] TFRA_TTS_DEFAULT = new byte[]{0x01, 0x01, 0x01};
-    private final static int EPOCH_OFFSET = 2082844800;
-
-    private Mp4Track[] infoTracks;
-    private SharpStream[] sourceTracks;
-
-    private Mp4DashReader[] readers;
-    private final long time;
-
-    private boolean done = false;
-    private boolean parsed = false;
-
-    private long written = 0;
-    private ArrayList<ArrayList<Integer>> chunkTimes;
-    private ArrayList<Long> moofOffsets;
-    private ArrayList<Integer> fragSizes;
-
-    public Mp4DashWriter(SharpStream... source) {
-        sourceTracks = source;
-        readers = new Mp4DashReader[sourceTracks.length];
-        infoTracks = new Mp4Track[sourceTracks.length];
-        time = (System.currentTimeMillis() / 1000L) + EPOCH_OFFSET;
-    }
-
-    public Mp4Track[] getTracksFromSource(int sourceIndex) throws IllegalStateException {
-        if (!parsed) {
-            throw new IllegalStateException("All sources must be parsed first");
-        }
-
-        return readers[sourceIndex].getAvailableTracks();
-    }
-
-    public void parseSources() throws IOException, IllegalStateException {
-        if (done) {
-            throw new IllegalStateException("already done");
-        }
-        if (parsed) {
-            throw new IllegalStateException("already parsed");
-        }
-
-        try {
-            for (int i = 0; i < readers.length; i++) {
-                readers[i] = new Mp4DashReader(sourceTracks[i]);
-                readers[i].parse();
-            }
-
-        } finally {
-            parsed = true;
-        }
-    }
-
-    public void selectTracks(int... trackIndex) throws IOException {
-        if (done) {
-            throw new IOException("already done");
-        }
-        if (chunkTimes != null) {
-            throw new IOException("tracks already selected");
-        }
-
-        try {
-            chunkTimes = new ArrayList<>(readers.length);
-            moofOffsets = new ArrayList<>(32);
-            fragSizes = new ArrayList<>(32);
-
-            for (int i = 0; i < readers.length; i++) {
-                infoTracks[i] = readers[i].selectTrack(trackIndex[i]);
-
-                chunkTimes.add(new ArrayList<Integer>(32));
-            }
-
-        } finally {
-            parsed = true;
-        }
-    }
-
-    public long getBytesWritten() {
-        return written;
-    }
-
-    public void build(SharpStream out) throws IOException, RuntimeException {
-        if (done) {
-            throw new RuntimeException("already done");
-        }
-        if (!out.canWrite()) {
-            throw new IOException("the provided output is not writable");
-        }
-
-        long sidxOffsets = -1;
-        int maxFrags = 0;
-
-        for (SharpStream stream : sourceTracks) {
-            if (!stream.canRewind()) {
-                sidxOffsets = -2;// sidx not available
-            }
-        }
-
-        try {
-            dump(make_ftyp(), out);
-            dump(make_moov(), out);
-
-            if (sidxOffsets == -1 && out.canRewind()) {
-                //<editor-fold defaultstate="collapsed" desc="calculate sidx">
-                int reserved = 0;
-                for (Mp4DashReader reader : readers) {
-                    int count = reader.getFragmentsCount();
-                    if (count > maxFrags) {
-                        maxFrags = count;
-                    }
-                    reserved += 12 + calcSidxBodySize(count);
-                }
-                if (maxFrags > 0xFFFF) {
-                    sidxOffsets = -3;// TODO: to many fragments, needs a multi-sidx implementation
-                } else {
-                    sidxOffsets = written;
-                    dump(make_free(reserved), out);
-                }
-                //</editor-fold>
-            }
-            ArrayList<Mp4TrackChunk> chunks = new ArrayList<>(readers.length);
-            chunks.add(null);
-
-            int read;
-            byte[] buffer = new byte[BUFFER_SIZE];
-            int sequenceNumber = 1;
-
-            while (true) {
-                chunks.clear();
-
-                for (int i = 0; i < readers.length; i++) {
-                    Mp4TrackChunk chunk = readers[i].getNextChunk();
-                    if (chunk == null || chunk.moof.traf.trun.chunkSize < 1) {
-                        continue;
-                    }
-                    chunk.moof.traf.tfhd.trackId = i + 1;
-                    chunks.add(chunk);
-
-                    if (sequenceNumber == 1) {
-                        if (chunk.moof.traf.trun.entryCount > 0 && hasFlag(chunk.moof.traf.trun.bFlags, 0x0800)) {
-                            chunkTimes.get(i).add(chunk.moof.traf.trun.getEntry(0).sampleCompositionTimeOffset);
-                        } else {
-                            chunkTimes.get(i).add(0);
-                        }
-                    }
-
-                    chunkTimes.get(i).add(chunk.moof.traf.trun.chunkDuration);
-                }
-
-                if (chunks.size() < 1) {
-                    break;
-                }
-
-                long offset = written;
-                moofOffsets.add(offset);
-
-                dump(make_moof(sequenceNumber++, chunks, offset), out);
-                dump(make_mdat(chunks), out);
-
-                for (Mp4TrackChunk chunk : chunks) {
-                    while ((read = chunk.data.read(buffer)) > 0) {
-                        out.write(buffer, 0, read);
-                        written += read;
-                    }
-                }
-
-                fragSizes.add((int) (written - offset));
-            }
-
-            dump(make_mfra(), out);
-
-            if (sidxOffsets > 0 && moofOffsets.size() == maxFrags) {
-                long len = written;
-
-                out.rewind();
-                out.skip(sidxOffsets);
-
-                written = sidxOffsets;
-                sidxOffsets = moofOffsets.get(0);
-
-                for (int i = 0; i < readers.length; i++) {
-                    dump(make_sidx(i, sidxOffsets - written), out);
-                }
-
-                written = len;
-            }
-        } finally {
-            done = true;
-        }
-    }
-
-    public boolean isDone() {
-        return done;
-    }
-
-    public boolean isParsed() {
-        return parsed;
-    }
-
-    public void close() {
-        done = true;
-        parsed = true;
-
-        for (SharpStream src : sourceTracks) {
-            src.dispose();
-        }
-
-        sourceTracks = null;
-        readers = null;
-        infoTracks = null;
-        moofOffsets = null;
-        chunkTimes = null;
-    }
-
-    // <editor-fold defaultstate="collapsed" desc="Utils">
-    private void dump(byte[][] buffer, SharpStream stream) throws IOException {
-        for (byte[] buff : buffer) {
-            stream.write(buff);
-            written += buff.length;
-        }
-    }
-
-    private byte[][] lengthFor(byte[][] buffer) {
-        int length = 0;
-        for (byte[] buff : buffer) {
-            length += buff.length;
-        }
-
-        ByteBuffer.wrap(buffer[0]).putInt(length);
-
-        return buffer;
-    }
-
-    private int calcSidxBodySize(int entryCount) {
-        return 4 + 4 + 8 + 8 + 4 + (entryCount * 12);
-    }
-    // </editor-fold>
-
-    // <editor-fold defaultstate="collapsed" desc="Box makers">
-    private byte[][] make_moof(int sequence, ArrayList<Mp4TrackChunk> chunks, long referenceOffset) {
-        int pos = 2;
-        TrunExtra[] extra = new TrunExtra[chunks.size()];
-
-        byte[][] buffer = new byte[pos + (extra.length * DIMENSIONAL_FIVE)][];
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x6D, 0x6F, 0x6F, 0x66,// info header
-            0x00, 0x00, 0x00, 0x10, 0x6D, 0x66, 0x68, 0x64, 0x00, 0x00, 0x00, 0x00//mfhd
-        };
-        buffer[1] = new byte[4];
-        ByteBuffer.wrap(buffer[1]).putInt(sequence);
-
-        for (int i = 0; i < extra.length; i++) {
-            extra[i] = new TrunExtra();
-            for (byte[] buff : make_traf(chunks.get(i), extra[i], referenceOffset)) {
-                buffer[pos++] = buff;
-            }
-        }
-
-        lengthFor(buffer);
-
-        int offset = 8 + ByteBuffer.wrap(buffer[0]).getInt();
-
-        for (int i = 0; i < extra.length; i++) {
-            extra[i].byteBuffer.putInt(offset);
-            offset += chunks.get(i).moof.traf.trun.chunkSize;
-        }
-
-        return buffer;
-    }
-
-    private byte[][] make_traf(Mp4TrackChunk chunk, TrunExtra extra, long moofOffset) {
-        byte[][] buffer = new byte[DIMENSIONAL_FIVE][];
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x74, 0x72, 0x61, 0x66,
-            0x00, 0x00, 0x00, 0x00, 0x74, 0x66, 0x68, 0x64
-        };
-
-        int flags = (chunk.moof.traf.tfhd.bFlags & 0x38) | 0x01;
-        byte tfhdBodySize = 8 + 8;
-        if (hasFlag(flags, 0x08)) {
-            tfhdBodySize += 4;
-        }
-        if (hasFlag(flags, 0x10)) {
-            tfhdBodySize += 4;
-        }
-        if (hasFlag(flags, 0x20)) {
-            tfhdBodySize += 4;
-        }
-        buffer[1] = new byte[tfhdBodySize];
-        ByteBuffer set = ByteBuffer.wrap(buffer[1]);
-        set.position(4);
-        set.putInt(chunk.moof.traf.tfhd.trackId);
-        set.putLong(moofOffset);
-        if (hasFlag(flags, 0x08)) {
-            set.putInt(chunk.moof.traf.tfhd.defaultSampleDuration);
-        }
-        if (hasFlag(flags, 0x10)) {
-            set.putInt(chunk.moof.traf.tfhd.defaultSampleSize);
-        }
-        if (hasFlag(flags, 0x20)) {
-            set.putInt(chunk.moof.traf.tfhd.defaultSampleFlags);
-        }
-        set.putInt(0, flags);
-        ByteBuffer.wrap(buffer[0]).putInt(8, 8 + tfhdBodySize);
-
-        buffer[2] = new byte[]{
-            0x00, 0x00, 0x00, 0x14,
-            0x74, 0x66, 0x64, 0x74,
-            0x01, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00
-        };
-
-        ByteBuffer.wrap(buffer[2]).putLong(12, chunk.moof.traf.tfdt);
-
-        buffer[3] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x74, 0x72, 0x75, 0x6E,
-            0x00, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00
-        };
-
-        buffer[4] = chunk.moof.traf.trun.bEntries;
-
-        lengthFor(buffer);
-
-        set = ByteBuffer.wrap(buffer[3]);
-        set.putInt(buffer[3].length + buffer[4].length);
-        set.position(8);
-        set.putInt((chunk.moof.traf.trun.bFlags | 0x01) & 0x0F01);
-        set.putInt(chunk.moof.traf.trun.entryCount);
-        extra.byteBuffer = set;
-
-        return buffer;
-    }
-
-    private byte[][] make_mdat(ArrayList<Mp4TrackChunk> chunks) {
-        byte[][] buffer = new byte[][]{
-            {
-                0x00, 0x00, 0x00, 0x00, 0x6D, 0x64, 0x61, 0x74
-            }
-        };
-
-        int length = 0;
-
-        for (Mp4TrackChunk chunk : chunks) {
-            length += chunk.moof.traf.trun.chunkSize;
-        }
-
-        ByteBuffer.wrap(buffer[0]).putInt(length + 8);
-
-        return buffer;
-    }
-
-    private byte[][] make_ftyp() {
-        return new byte[][]{
-            {
-                0x00, 0x00, 0x00, 0x20, 0x66, 0x74, 0x79, 0x70, 0x64, 0x61, 0x73, 0x68, 0x00, 0x00, 0x00, 0x00,
-                0x6D, 0x70, 0x34, 0x31, 0x69, 0x73, 0x6F, 0x6D, 0x69, 0x73, 0x6F, 0x36, 0x69, 0x73, 0x6F, 0x32
-            }
-        };
-    }
-
-    private byte[][] make_mvhd() {
-        byte[][] buffer = new byte[DIMENSIONAL_FIVE][];
-
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x78, 0x6D, 0x76, 0x68, 0x64, 0x01, 0x00, 0x00, 0x00
-        };
-        buffer[1] = new byte[28];
-        buffer[2] = new byte[]{
-            0x00, 0x01, 0x00, 0x00, 0x01, 0x00,// default volume and rate
-            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,// reserved values
-            // default matrix
-            0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-            0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-            0x40, 0x00, 0x00, 0x00
-        };
-        buffer[3] = new byte[24];// predefined
-        buffer[4] = ByteBuffer.allocate(4).putInt(infoTracks.length + 1).array();
-
-        long longestTrack = 0;
-
-        for (Mp4Track track : infoTracks) {
-            long tmp = (long) ((track.trak.tkhd.duration / (double) track.trak.mdia_mdhd_timeScale) * DEFAULT_TIMESCALE);
-            if (tmp > longestTrack) {
-                longestTrack = tmp;
-            }
-        }
-
-        ByteBuffer.wrap(buffer[1])
-                .putLong(time)
-                .putLong(time)
-                .putInt(DEFAULT_TIMESCALE)
-                .putLong(longestTrack);
-
-        return buffer;
-    }
-
-    private byte[][] make_trak(int trackId, Trak trak) throws RuntimeException {
-        if (trak.tkhd.matrix.length != 36) {
-            throw new RuntimeException("bad track matrix length (expected 36)");
-        }
-
-        byte[][] buffer = new byte[DIMENSIONAL_FIVE][];
-
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x74, 0x72, 0x61, 0x6B,// trak header
-            0x00, 0x00, 0x00, 0x68, 0x74, 0x6B, 0x68, 0x64, 0x01, 0x00, 0x00, 0x03 // tkhd header
-        };
-        buffer[1] = new byte[48];
-        buffer[2] = trak.tkhd.matrix;
-        buffer[3] = new byte[8];
-        buffer[4] = trak.mdia;
-
-        ByteBuffer set = ByteBuffer.wrap(buffer[1]);
-        set.putLong(time);
-        set.putLong(time);
-        set.putInt(trackId);
-        set.position(24);
-        set.putLong(trak.tkhd.duration);
-        set.position(40);
-        set.putShort(trak.tkhd.bLayer);
-        set.putShort(trak.tkhd.bAlternateGroup);
-        set.putShort(trak.tkhd.bVolume);
-
-        ByteBuffer.wrap(buffer[3])
-                .putInt(trak.tkhd.bWidth)
-                .putInt(trak.tkhd.bHeight);
-
-        return lengthFor(buffer);
-    }
-
-    private byte[][] make_moov() throws RuntimeException {
-        int pos = 1;
-        byte[][] buffer = new byte[2 + (DIMENSIONAL_TWO * infoTracks.length) + (DIMENSIONAL_FIVE * infoTracks.length) + DIMENSIONAL_FIVE + 1][];
-
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x6D, 0x6F, 0x6F, 0x76
-        };
-
-        for (byte[] buff : make_mvhd()) {
-            buffer[pos++] = buff;
-        }
-
-        for (int i = 0; i < infoTracks.length; i++) {
-            for (byte[] buff : make_trak(i + 1, infoTracks[i].trak)) {
-                buffer[pos++] = buff;
-            }
-        }
-
-        buffer[pos] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x6D, 0x76, 0x65, 0x78
-        };
-
-        ByteBuffer.wrap(buffer[pos++]).putInt((infoTracks.length * DEFAULT_TREX_SIZE) + 8);
-
-        for (int i = 0; i < infoTracks.length; i++) {
-            for (byte[] buff : make_trex(i + 1, infoTracks[i].trex)) {
-                buffer[pos++] = buff;
-            }
-        }
-
-        // default udta
-        buffer[pos] = new byte[]{
-            0x00, 0x00, 0x00, 0x5C, 0x75, 0x64, 0x74, 0x61, 0x00, 0x00, 0x00, 0x54, 0x6D, 0x65, 0x74, 0x61,
-            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0x68, 0x64, 0x6C, 0x72, 0x00, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00, 0x6D, 0x64, 0x69, 0x72, 0x61, 0x70, 0x70, 0x6C, 0x00, 0x00, 0x00, 0x00,
-            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x27, 0x69, 0x6C, 0x73, 0x74, 0x00, 0x00, 0x00,
-            0x1F, (byte) 0xA9, 0x63, 0x6D, 0x74, 0x00, 0x00, 0x00, 0x17, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00, 0x00,
-            0x01, 0x00, 0x00, 0x00, 0x00,
-            0x4E, 0x65, 0x77, 0x50, 0x69, 0x70, 0x65// "NewPipe" binary string
-        };
-
-        return lengthFor(buffer);
-    }
-
-    private byte[][] make_trex(int trackId, Trex trex) {
-        byte[][] buffer = new byte[][]{
-            {
-                0x00, 0x00, 0x00, 0x20, 0x74, 0x72, 0x65, 0x78, 0x00, 0x00, 0x00, 0x00
-            },
-            new byte[20]
-        };
-
-        ByteBuffer.wrap(buffer[1])
-                .putInt(trackId)
-                .putInt(trex.defaultSampleDescriptionIndex)
-                .putInt(trex.defaultSampleDuration)
-                .putInt(trex.defaultSampleSize)
-                .putInt(trex.defaultSampleFlags);
-
-        return buffer;
-    }
-
-    private byte[][] make_tfra(int trackId, List<Integer> times, List<Long> moofOffsets) {
-        int entryCount = times.size() - 1;
-        byte[][] buffer = new byte[DIMENSIONAL_TWO][];
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x74, 0x66, 0x72, 0x61, 0x01, 0x00, 0x00, 0x00
-        };
-        buffer[1] = new byte[12 + ((16 + TFRA_TTS_DEFAULT.length) * entryCount)];
-
-        ByteBuffer set = ByteBuffer.wrap(buffer[1]);
-        set.putInt(trackId);
-        set.position(8);
-        set.putInt(entryCount);
-
-        long decodeTime = 0;
-
-        for (int i = 0; i < entryCount; i++) {
-            decodeTime += times.get(i);
-            set.putLong(decodeTime);
-            set.putLong(moofOffsets.get(i));
-            set.put(TFRA_TTS_DEFAULT);// default values: traf number/trun number/sample number
-        }
-
-        return lengthFor(buffer);
-    }
-
-    private byte[][] make_mfra() {
-        byte[][] buffer = new byte[2 + (DIMENSIONAL_TWO * infoTracks.length)][];
-        buffer[0] = new byte[]{
-            0x00, 0x00, 0x00, 0x00, 0x6D, 0x66, 0x72, 0x61
-        };
-        int pos = 1;
-
-        for (int i = 0; i < infoTracks.length; i++) {
-            for (byte[] buff : make_tfra(i + 1, chunkTimes.get(i), moofOffsets)) {
-                buffer[pos++] = buff;
-            }
-        }
-
-        buffer[pos] = new byte[]{// mfro
-            0x00, 0x00, 0x00, 0x10, 0x6D, 0x66, 0x72, 0x6F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
-        };
-
-        lengthFor(buffer);
-
-        ByteBuffer set = ByteBuffer.wrap(buffer[pos]);
-        set.position(12);
-        set.put(buffer[0], 0, 4);
-
-        return buffer;
-
-    }
-
-    private byte[][] make_sidx(int internalTrackId, long firstOffset) {
-        List<Integer> times = chunkTimes.get(internalTrackId);
-        int count = times.size() - 1;// the first item is ignored (composition time)
-
-        if (count > 65535) {
-            throw new OutOfMemoryError("to many fragments. sidx limit is 65535, found " + String.valueOf(count));
-        }
-
-        byte[][] buffer = new byte[][]{
-            new byte[]{
-                0x00, 0x00, 0x00, 0x00, 0x73, 0x69, 0x64, 0x78, 0x01, 0x00, 0x00, 0x00
-            },
-            new byte[calcSidxBodySize(count)]
-        };
-
-        lengthFor(buffer);
-
-        ByteBuffer set = ByteBuffer.wrap(buffer[1]);
-        set.putInt(internalTrackId + 1);
-        set.putInt(infoTracks[internalTrackId].trak.mdia_mdhd_timeScale);
-        set.putLong(0);
-        set.putLong(firstOffset - ByteBuffer.wrap(buffer[0]).getInt());
-        set.putInt(0xFFFF & count);// unsigned
-
-        int i = 0;
-        while (i < count) {
-            set.putInt(fragSizes.get(i) & 0x7fffffff);// default reference type is 0
-            set.putInt(times.get(i + 1));
-            set.putInt(0x90000000);// default SAP settings
-            i++;
-        }
-
-        return buffer;
-    }
-
-    private byte[][] make_free(int totalSize) {
-        return lengthFor(new byte[][]{
-            new byte[]{0x00, 0x00, 0x00, 0x00, 0x66, 0x72, 0x65, 0x65},
-            new byte[totalSize - 8]// this is waste of RAM
-        });
-
-    }
-
-//</editor-fold>
-
-    class TrunExtra {
-
-        ByteBuffer byteBuffer;
-    }
-}

app/src/main/java/org/schabi/newpipe/streams/Mp4FromDashWriter.java

@@ -0,0 +1,810 @@
+package org.schabi.newpipe.streams;
+
+import org.schabi.newpipe.streams.Mp4DashReader.Hdlr;
+import org.schabi.newpipe.streams.Mp4DashReader.Mdia;
+import org.schabi.newpipe.streams.Mp4DashReader.Mp4DashChunk;
+import org.schabi.newpipe.streams.Mp4DashReader.Mp4DashSample;
+import org.schabi.newpipe.streams.Mp4DashReader.Mp4Track;
+import org.schabi.newpipe.streams.Mp4DashReader.TrunEntry;
+import org.schabi.newpipe.streams.io.SharpStream;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+/**
+ *
+ * @author kapodamy
+ */
+public class Mp4FromDashWriter {
+
+    private final static int EPOCH_OFFSET = 2082844800;
+    private final static short DEFAULT_TIMESCALE = 1000;
+    private final static byte SAMPLES_PER_CHUNK_INIT = 2;
+    private final static byte SAMPLES_PER_CHUNK = 6;// ffmpeg uses 2, basic uses 1 (with 60fps uses 21 or 22). NewPipe will use 6
+    private final static long THRESHOLD_FOR_CO64 = 0xFFFEFFFFL;// near 3.999 GiB
+    private final static int THRESHOLD_MOOV_LENGTH = (256 * 1024) + (2048 * 1024); // 2.2 MiB enough for: 1080p 60fps 00h35m00s
+
+    private final long time;
+
+    private ByteBuffer auxBuffer;
+    private SharpStream outStream;
+
+    private long lastWriteOffset = -1;
+    private long writeOffset;
+
+    private boolean moovSimulation = true;
+
+    private boolean done = false;
+    private boolean parsed = false;
+
+    private Mp4Track[] tracks;
+    private SharpStream[] sourceTracks;
+
+    private Mp4DashReader[] readers;
+    private Mp4DashChunk[] readersChunks;
+
+    private int overrideMainBrand = 0x00;
+
+    public Mp4FromDashWriter(SharpStream... sources) throws IOException {
+        for (SharpStream src : sources) {
+            if (!src.canRewind() && !src.canRead()) {
+                throw new IOException("All sources must be readable and allow rewind");
+            }
+        }
+
+        sourceTracks = sources;
+        readers = new Mp4DashReader[sourceTracks.length];
+        readersChunks = new Mp4DashChunk[readers.length];
+        time = (System.currentTimeMillis() / 1000L) + EPOCH_OFFSET;
+    }
+
+    public Mp4Track[] getTracksFromSource(int sourceIndex) throws IllegalStateException {
+        if (!parsed) {
+            throw new IllegalStateException("All sources must be parsed first");
+        }
+
+        return readers[sourceIndex].getAvailableTracks();
+    }
+
+    public void parseSources() throws IOException, IllegalStateException {
+        if (done) {
+            throw new IllegalStateException("already done");
+        }
+        if (parsed) {
+            throw new IllegalStateException("already parsed");
+        }
+
+        try {
+            for (int i = 0; i < readers.length; i++) {
+                readers[i] = new Mp4DashReader(sourceTracks[i]);
+                readers[i].parse();
+            }
+
+        } finally {
+            parsed = true;
+        }
+    }
+
+    public void selectTracks(int... trackIndex) throws IOException {
+        if (done) {
+            throw new IOException("already done");
+        }
+        if (tracks != null) {
+            throw new IOException("tracks already selected");
+        }
+
+        try {
+            tracks = new Mp4Track[readers.length];
+            for (int i = 0; i < readers.length; i++) {
+                tracks[i] = readers[i].selectTrack(trackIndex[i]);
+            }
+        } finally {
+            parsed = true;
+        }
+    }
+
+    public void setMainBrand(int brandId) {
+        overrideMainBrand = brandId;
+    }
+
+    public boolean isDone() {
+        return done;
+    }
+
+    public boolean isParsed() {
+        return parsed;
+    }
+
+    public void close() throws IOException {
+        done = true;
+        parsed = true;
+
+        for (SharpStream src : sourceTracks) {
+            src.dispose();
+        }
+
+        tracks = null;
+        sourceTracks = null;
+
+        readers = null;
+        readersChunks = null;
+
+        auxBuffer = null;
+        outStream = null;
+    }
+
+    public void build(SharpStream output) throws IOException {
+        if (done) {
+            throw new RuntimeException("already done");
+        }
+        if (!output.canWrite()) {
+            throw new IOException("the provided output is not writable");
+        }
+
+        //
+        // WARNING: the muxer requires at least 8 samples of every track
+        //          not allowed for very short tracks (less than 0.5 seconds)
+        //
+        outStream = output;
+        int read = 8;// mdat box header size
+        long totalSampleSize = 0;
+        int[] sampleExtra = new int[readers.length];
+        int[] defaultMediaTime = new int[readers.length];
+        int[] defaultSampleDuration = new int[readers.length];
+        int[] sampleCount = new int[readers.length];
+
+        TablesInfo[] tablesInfo = new TablesInfo[tracks.length];
+        for (int i = 0; i < tablesInfo.length; i++) {
+            tablesInfo[i] = new TablesInfo();
+        }
+
+        //<editor-fold defaultstate="expanded" desc="calculate stbl sample tables size and required moov values">
+        for (int i = 0; i < readers.length; i++) {
+            int samplesSize = 0;
+            int sampleSizeChanges = 0;
+            int compositionOffsetLast = -1;
+
+            Mp4DashChunk chunk;
+            while ((chunk = readers[i].getNextChunk(true)) != null) {
+
+                if (defaultMediaTime[i] < 1 && chunk.moof.traf.tfhd.defaultSampleDuration > 0) {
+                    defaultMediaTime[i] = chunk.moof.traf.tfhd.defaultSampleDuration;
+                }
+
+                read += chunk.moof.traf.trun.chunkSize;
+                sampleExtra[i] += chunk.moof.traf.trun.chunkDuration;// calculate track duration
+
+                TrunEntry info;
+                while ((info = chunk.getNextSampleInfo()) != null) {
+                    if (info.isKeyframe) {
+                        tablesInfo[i].stss++;
+                    }
+
+                    if (info.sampleDuration > defaultSampleDuration[i]) {
+                        defaultSampleDuration[i] = info.sampleDuration;
+                    }
+
+                    tablesInfo[i].stsz++;
+                    if (samplesSize != info.sampleSize) {
+                        samplesSize = info.sampleSize;
+                        sampleSizeChanges++;
+                    }
+
+                    if (info.hasCompositionTimeOffset) {
+                        if (info.sampleCompositionTimeOffset != compositionOffsetLast) {
+                            tablesInfo[i].ctts++;
+                            compositionOffsetLast = info.sampleCompositionTimeOffset;
+                        }
+                    }
+
+                    totalSampleSize += info.sampleSize;
+                }
+            }
+
+            if (defaultMediaTime[i] < 1) {
+                defaultMediaTime[i] = defaultSampleDuration[i];
+            }
+
+            readers[i].rewind();
+
+            int tmp = tablesInfo[i].stsz - SAMPLES_PER_CHUNK_INIT;
+            tablesInfo[i].stco = (tmp / SAMPLES_PER_CHUNK) + 1;// +1 for samples in first chunk
+
+            tmp = tmp % SAMPLES_PER_CHUNK;
+            if (tmp == 0) {
+                tablesInfo[i].stsc = 2;// first chunk (init) and succesive chunks
+                tablesInfo[i].stsc_bEntries = new int[]{
+                        1, SAMPLES_PER_CHUNK_INIT, 1,
+                        2, SAMPLES_PER_CHUNK, 1
+                };
+            } else {
+                tablesInfo[i].stsc = 3;// first chunk (init) and succesive chunks and remain chunk
+                tablesInfo[i].stsc_bEntries = new int[]{
+                        1, SAMPLES_PER_CHUNK_INIT, 1,
+                        2, SAMPLES_PER_CHUNK, 1,
+                        tablesInfo[i].stco + 1, tmp, 1
+                };
+                tablesInfo[i].stco++;
+            }
+
+            sampleCount[i] = tablesInfo[i].stsz;
+
+            if (sampleSizeChanges == 1) {
+                tablesInfo[i].stsz = 0;
+                tablesInfo[i].stsz_default = samplesSize;
+            } else {
+                tablesInfo[i].stsz_default = 0;
+            }
+
+            if (tablesInfo[i].stss == tablesInfo[i].stsz) {
+                tablesInfo[i].stss = -1;// for audio tracks (all samples are keyframes)
+            }
+
+            // ensure track duration
+            if (tracks[i].trak.tkhd.duration < 1) {
+                tracks[i].trak.tkhd.duration = sampleExtra[i];// this never should happen
+            }
+        }
+        //</editor-fold>
+
+        boolean is64 = read > THRESHOLD_FOR_CO64;
+
+        // calculate the moov size;
+        int auxSize = make_moov(defaultMediaTime, tablesInfo, is64);
+
+        if (auxSize < THRESHOLD_MOOV_LENGTH) {
+            auxBuffer = ByteBuffer.allocate(auxSize);// cache moov in the memory
+        }
+
+        moovSimulation = false;
+        writeOffset = 0;
+
+        final int ftyp_size = make_ftyp();
+
+        // reserve moov space in the output stream
+        if (outStream.canSetLength()) {
+            long length = writeOffset + auxSize;
+            outStream.setLength(length);
+            outSeek(length);
+        } else {
+            // hard way
+            int length = auxSize;
+            byte[] buffer = new byte[8 * 1024];// 8 KiB
+            while (length > 0) {
+                int count = Math.min(length, buffer.length);
+                outWrite(buffer, 0, count);
+                length -= count;
+            }
+        }
+        if (auxBuffer == null) {
+            outSeek(ftyp_size);
+        }
+
+        // tablesInfo contais row counts
+        // and after returning from make_moov() will contain table offsets
+        make_moov(defaultMediaTime, tablesInfo, is64);
+
+        // write tables: stts stsc
+        // reset for ctts table: sampleCount sampleExtra
+        for (int i = 0; i < readers.length; i++) {
+            writeEntryArray(tablesInfo[i].stts, 2, sampleCount[i], defaultSampleDuration[i]);
+            writeEntryArray(tablesInfo[i].stsc, tablesInfo[i].stsc_bEntries.length, tablesInfo[i].stsc_bEntries);
+            tablesInfo[i].stsc_bEntries = null;
+            if (tablesInfo[i].ctts > 0) {
+                sampleCount[i] = 1;// index is not base zero
+                sampleExtra[i] = -1;
+            }
+        }
+
+        if (auxBuffer == null) {
+            outRestore();
+        }
+
+        outWrite(make_mdat(totalSampleSize, is64));
+
+        int[] sampleIndex = new int[readers.length];
+        int[] sizes = new int[SAMPLES_PER_CHUNK];
+        int[] sync = new int[SAMPLES_PER_CHUNK];
+
+        int written = readers.length;
+        while (written > 0) {
+            written = 0;
+
+            for (int i = 0; i < readers.length; i++) {
+                if (sampleIndex[i] < 0) {
+                    continue;// track is done
+                }
+
+                long chunkOffset = writeOffset;
+                int syncCount = 0;
+                int limit = sampleIndex[i] == 0 ? SAMPLES_PER_CHUNK_INIT : SAMPLES_PER_CHUNK;
+
+                int j = 0;
+                for (; j < limit; j++) {
+                    Mp4DashSample sample = getNextSample(i);
+
+                    if (sample == null) {
+                        if (tablesInfo[i].ctts > 0 && sampleExtra[i] >= 0) {
+                            writeEntryArray(tablesInfo[i].ctts, 1, sampleCount[i], sampleExtra[i]);// flush last entries
+                        }
+                        sampleIndex[i] = -1;
+                        break;
+                    }
+
+                    sampleIndex[i]++;
+
+                    if (tablesInfo[i].ctts > 0) {
+                        if (sample.info.sampleCompositionTimeOffset == sampleExtra[i]) {
+                            sampleCount[i]++;
+                        } else {
+                            if (sampleExtra[i] >= 0) {
+                                tablesInfo[i].ctts = writeEntryArray(tablesInfo[i].ctts, 2, sampleCount[i], sampleExtra[i]);
+                                outRestore();
+                            }
+                            sampleCount[i] = 1;
+                            sampleExtra[i] = sample.info.sampleCompositionTimeOffset;
+                        }
+                    }
+
+                    if (tablesInfo[i].stss > 0 && sample.info.isKeyframe) {
+                        sync[syncCount++] = sampleIndex[i];
+                    }
+
+                    if (tablesInfo[i].stsz > 0) {
+                        sizes[j] = sample.data.length;
+                    }
+
+                    outWrite(sample.data, 0, sample.data.length);
+                }
+
+                if (j > 0) {
+                    written++;
+
+                    if (tablesInfo[i].stsz > 0) {
+                        tablesInfo[i].stsz = writeEntryArray(tablesInfo[i].stsz, j, sizes);
+                    }
+
+                    if (syncCount > 0) {
+                        tablesInfo[i].stss = writeEntryArray(tablesInfo[i].stss, syncCount, sync);
+                    }
+
+                    if (is64) {
+                        tablesInfo[i].stco = writeEntry64(tablesInfo[i].stco, chunkOffset);
+                    } else {
+                        tablesInfo[i].stco = writeEntryArray(tablesInfo[i].stco, 1, (int) chunkOffset);
+                    }
+
+                    outRestore();
+                }
+            }
+        }
+
+        if (auxBuffer != null) {
+            // dump moov
+            outSeek(ftyp_size);
+            outStream.write(auxBuffer.array(), 0, auxBuffer.capacity());
+            auxBuffer = null;
+        }
+    }
+
+    private Mp4DashSample getNextSample(int track) throws IOException {
+        if (readersChunks[track] == null) {
+            readersChunks[track] = readers[track].getNextChunk(false);
+            if (readersChunks[track] == null) {
+                return null;// EOF reached
+            }
+        }
+
+        Mp4DashSample sample = readersChunks[track].getNextSample();
+        if (sample == null) {
+            readersChunks[track] = null;
+            return getNextSample(track);
+        } else {
+            return sample;
+        }
+    }
+
+    // <editor-fold defaultstate="expanded" desc="Stbl handling">
+    private int writeEntry64(int offset, long value) throws IOException {
+        outBackup();
+
+        auxSeek(offset);
+        auxWrite(ByteBuffer.allocate(8).putLong(value).array());
+
+        return offset + 8;
+    }
+
+    private int writeEntryArray(int offset, int count, int... values) throws IOException {
+        outBackup();
+
+        auxSeek(offset);
+
+        int size = count * 4;
+        ByteBuffer buffer = ByteBuffer.allocate(size);
+
+        for (int i = 0; i < count; i++) {
+            buffer.putInt(values[i]);
+        }
+
+        auxWrite(buffer.array());
+
+        return offset + size;
+    }
+
+    private void outBackup() {
+        if (auxBuffer == null && lastWriteOffset < 0) {
+            lastWriteOffset = writeOffset;
+        }
+    }
+
+    /**
+     * Restore to the previous position before the first call to writeEntry64()
+     * or writeEntryArray() methods.
+     */
+    private void outRestore() throws IOException {
+        if (lastWriteOffset > 0) {
+            outSeek(lastWriteOffset);
+            lastWriteOffset = -1;
+        }
+    }
+    // </editor-fold>
+
+    // <editor-fold defaultstate="expanded" desc="Utils">
+    private void outWrite(byte[] buffer) throws IOException {
+        outWrite(buffer, 0, buffer.length);
+    }
+
+    private void outWrite(byte[] buffer, int offset, int count) throws IOException {
+        writeOffset += count;
+        outStream.write(buffer, offset, count);
+    }
+
+    private void outSeek(long offset) throws IOException {
+        if (outStream.canSeek()) {
+            outStream.seek(offset);
+            writeOffset = offset;
+        } else if (outStream.canRewind()) {
+            outStream.rewind();
+            writeOffset = 0;
+            outSkip(offset);
+        } else {
+            throw new IOException("cannot seek or rewind the output stream");
+        }
+    }
+
+    private void outSkip(long amount) throws IOException {
+        outStream.skip(amount);
+        writeOffset += amount;
+    }
+
+    private int lengthFor(int offset) throws IOException {
+        int size = auxOffset() - offset;
+
+        if (moovSimulation) {
+            return size;
+        }
+
+        auxSeek(offset);
+        auxWrite(size);
+        auxSkip(size - 4);
+
+        return size;
+    }
+
+    private int make(int type, int extra, int columns, int rows) throws IOException {
+        final byte base = 16;
+        int size = columns * rows * 4;
+        int total = size + base;
+        int offset = auxOffset();
+
+        if (extra >= 0) {
+            total += 4;
+        }
+
+        auxWrite(ByteBuffer.allocate(12)
+                .putInt(total)
+                .putInt(type)
+                .putInt(0x00)// default version & flags
+                .array()
+        );
+
+        if (extra >= 0) {
+            //size += 4;// commented for auxiliar buffer !!!
+            offset += 4;
+            auxWrite(extra);
+        }
+
+        auxWrite(rows);
+        auxSkip(size);
+
+        return offset + base;
+    }
+
+    private void auxWrite(int value) throws IOException {
+        auxWrite(ByteBuffer.allocate(4)
+                .putInt(value)
+                .array()
+        );
+    }
+
+    private void auxWrite(byte[] buffer) throws IOException {
+        if (moovSimulation) {
+            writeOffset += buffer.length;
+        } else if (auxBuffer == null) {
+            outWrite(buffer, 0, buffer.length);
+        } else {
+            auxBuffer.put(buffer);
+        }
+    }
+
+    private void auxSeek(int offset) throws IOException {
+        if (moovSimulation) {
+            writeOffset = offset;
+        } else if (auxBuffer == null) {
+            outSeek(offset);
+        } else {
+            auxBuffer.position(offset);
+        }
+    }
+
+    private void auxSkip(int amount) throws IOException {
+        if (moovSimulation) {
+            writeOffset += amount;
+        } else if (auxBuffer == null) {
+            outSkip(amount);
+        } else {
+            auxBuffer.position(auxBuffer.position() + amount);
+        }
+    }
+
+    private int auxOffset() {
+        return auxBuffer == null ? (int) writeOffset : auxBuffer.position();
+    }
+    // </editor-fold>
+
+    // <editor-fold defaultstate="expanded" desc="Box makers">
+    private int make_ftyp() throws IOException {
+        byte[] buffer = new byte[]{
+                0x00, 0x00, 0x00, 0x1C, 0x66, 0x74, 0x79, 0x70,// ftyp
+                0x6D, 0x70, 0x34, 0x32,// mayor brand (mp42)
+                0x00, 0x00, 0x02, 0x00,// default minor version (512)
+                0x6D, 0x70, 0x34, 0x31, 0x69, 0x73, 0x6F, 0x6D, 0x69, 0x73, 0x6F, 0x32// compatible brands: mp41 isom iso2
+        };
+
+        if (overrideMainBrand != 0)
+            ByteBuffer.wrap(buffer).putInt(8, overrideMainBrand);
+
+        outWrite(buffer);
+
+        return buffer.length;
+    }
+
+    private byte[] make_mdat(long refSize, boolean is64) {
+        if (is64) {
+            refSize += 16;
+        } else {
+            refSize += 8;
+        }
+
+        ByteBuffer buffer = ByteBuffer.allocate(is64 ? 16 : 8)
+                .putInt(is64 ? 0x01 : (int) refSize)
+                .putInt(0x6D646174);// mdat
+
+        if (is64) {
+            buffer.putLong(refSize);
+        }
+
+        return buffer.array();
+    }
+
+    private void make_mvhd(long longestTrack) throws IOException {
+        auxWrite(new byte[]{
+                0x00, 0x00, 0x00, 0x78, 0x6D, 0x76, 0x68, 0x64, 0x01, 0x00, 0x00, 0x00
+        });
+        auxWrite(ByteBuffer.allocate(28)
+                .putLong(time)
+                .putLong(time)
+                .putInt(DEFAULT_TIMESCALE)
+                .putLong(longestTrack)
+                .array()
+        );
+
+        auxWrite(new byte[]{
+                0x00, 0x01, 0x00, 0x00, 0x01, 0x00,// default volume and rate
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,// reserved values
+                // default matrix
+                0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x40, 0x00, 0x00, 0x00
+        });
+        auxWrite(new byte[24]);// predefined
+        auxWrite(ByteBuffer.allocate(4)
+                .putInt(tracks.length + 1)
+                .array()
+        );
+    }
+
+    private int make_moov(int[] defaultMediaTime, TablesInfo[] tablesInfo, boolean is64) throws RuntimeException, IOException {
+        int start = auxOffset();
+
+        auxWrite(new byte[]{
+                0x00, 0x00, 0x00, 0x00, 0x6D, 0x6F, 0x6F, 0x76
+        });
+
+        long longestTrack = 0;
+        long[] durations = new long[tracks.length];
+
+        for (int i = 0; i < durations.length; i++) {
+            durations[i] = (long) Math.ceil(
+                    ((double) tracks[i].trak.tkhd.duration / tracks[i].trak.mdia.mdhd_timeScale) * DEFAULT_TIMESCALE
+            );
+
+            if (durations[i] > longestTrack) {
+                longestTrack = durations[i];
+            }
+        }
+
+        make_mvhd(longestTrack);
+
+        for (int i = 0; i < tracks.length; i++) {
+            if (tracks[i].trak.tkhd.matrix.length != 36) {
+                throw new RuntimeException("bad track matrix length (expected 36) in track n°" + i);
+            }
+            make_trak(i, durations[i], defaultMediaTime[i], tablesInfo[i], is64);
+        }
+
+        // udta/meta/ilst/©too
+        auxWrite(new byte[]{
+                0x00, 0x00, 0x00, 0x5C, 0x75, 0x64, 0x74, 0x61, 0x00, 0x00, 0x00, 0x54, 0x6D, 0x65, 0x74, 0x61,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0x68, 0x64, 0x6C, 0x72, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x6D, 0x64, 0x69, 0x72, 0x61, 0x70, 0x70, 0x6C, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x27, 0x69, 0x6C, 0x73, 0x74, 0x00, 0x00, 0x00,
+                0x1F, (byte) 0xA9, 0x74, 0x6F, 0x6F, 0x00, 0x00, 0x00, 0x17, 0x64, 0x61, 0x74, 0x61, 0x00, 0x00,
+                0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
+                0x4E, 0x65, 0x77, 0x50, 0x69, 0x70, 0x65// "NewPipe" binary string
+        });
+
+        return lengthFor(start);
+    }
+
+    private void make_trak(int index, long duration, int defaultMediaTime, TablesInfo tables, boolean is64) throws IOException {
+        int start = auxOffset();
+
+        auxWrite(new byte[]{
+                0x00, 0x00, 0x00, 0x00, 0x74, 0x72, 0x61, 0x6B,// trak header
+                0x00, 0x00, 0x00, 0x68, 0x74, 0x6B, 0x68, 0x64, 0x01, 0x00, 0x00, 0x03 // tkhd header
+        });
+
+        ByteBuffer buffer = ByteBuffer.allocate(48);
+        buffer.putLong(time);
+        buffer.putLong(time);
+        buffer.putInt(index + 1);
+        buffer.position(24);
+        buffer.putLong(duration);
+        buffer.position(40);
+        buffer.putShort(tracks[index].trak.tkhd.bLayer);
+        buffer.putShort(tracks[index].trak.tkhd.bAlternateGroup);
+        buffer.putShort(tracks[index].trak.tkhd.bVolume);
+        auxWrite(buffer.array());
+
+        auxWrite(tracks[index].trak.tkhd.matrix);
+        auxWrite(ByteBuffer.allocate(8)
+                .putInt(tracks[index].trak.tkhd.bWidth)
+                .putInt(tracks[index].trak.tkhd.bHeight)
+                .array()
+        );
+
+        auxWrite(new byte[]{
+                0x00, 0x00, 0x00, 0x24, 0x65, 0x64, 0x74, 0x73,// edts header
+                0x00, 0x00, 0x00, 0x1C, 0x65, 0x6C, 0x73, 0x74, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01// elst header
+        });
+
+        int bMediaRate;
+        int mediaTime;
+
+        if (tracks[index].trak.edst_elst == null) {
+            // is a audio track ¿is edst/elst opcional for audio tracks?
+            mediaTime = 0x00;// ffmpeg set this value as zero, instead of defaultMediaTime
+            bMediaRate = 0x00010000;
+        } else {
+            mediaTime = (int) tracks[index].trak.edst_elst.MediaTime;
+            bMediaRate = tracks[index].trak.edst_elst.bMediaRate;
+        }
+
+        auxWrite(ByteBuffer
+                .allocate(12)
+                .putInt((int) duration)
+                .putInt(mediaTime)
+                .putInt(bMediaRate)
+                .array()
+        );
+
+        make_mdia(tracks[index].trak.mdia, tables, is64);
+
+        lengthFor(start);
+    }
+
+    private void make_mdia(Mdia mdia, TablesInfo tablesInfo, boolean is64) throws IOException {
+
+        int start_mdia = auxOffset();
+        auxWrite(new byte[]{0x00, 0x00, 0x00, 0x00, 0x6D, 0x64, 0x69, 0x61});// mdia
+        auxWrite(mdia.mdhd);
+        auxWrite(make_hdlr(mdia.hdlr));
+
+        int start_minf = auxOffset();
+        auxWrite(new byte[]{0x00, 0x00, 0x00, 0x00, 0x6D, 0x69, 0x6E, 0x66});// minf
+        auxWrite(mdia.minf.$mhd);
+        auxWrite(mdia.minf.dinf);
+
+        int start_stbl = auxOffset();
+        auxWrite(new byte[]{0x00, 0x00, 0x00, 0x00, 0x73, 0x74, 0x62, 0x6C});// stbl
+        auxWrite(mdia.minf.stbl_stsd);
+
+        //
+        // In audio tracks the following tables is not required: ssts ctts
+        // And stsz can be empty if has a default sample size
+        //
+        if (moovSimulation) {
+            make(0x73747473, -1, 2, 1);
+            if (tablesInfo.stss > 0) {
+                make(0x73747373, -1, 1, tablesInfo.stss);
+            }
+            if (tablesInfo.ctts > 0) {
+                make(0x63747473, -1, 2, tablesInfo.ctts);
+            }
+            make(0x73747363, -1, 3, tablesInfo.stsc);
+            make(0x7374737A, tablesInfo.stsz_default, 1, tablesInfo.stsz);
+            make(is64 ? 0x636F3634 : 0x7374636F, -1, is64 ? 2 : 1, tablesInfo.stco);
+        } else {
+            tablesInfo.stts = make(0x73747473, -1, 2, 1);
+            if (tablesInfo.stss > 0) {
+                tablesInfo.stss = make(0x73747373, -1, 1, tablesInfo.stss);
+            }
+            if (tablesInfo.ctts > 0) {
+                tablesInfo.ctts = make(0x63747473, -1, 2, tablesInfo.ctts);
+            }
+            tablesInfo.stsc = make(0x73747363, -1, 3, tablesInfo.stsc);
+            tablesInfo.stsz = make(0x7374737A, tablesInfo.stsz_default, 1, tablesInfo.stsz);
+            tablesInfo.stco = make(is64 ? 0x636F3634 : 0x7374636F, -1, is64 ? 2 : 1, tablesInfo.stco);
+        }
+
+        lengthFor(start_stbl);
+        lengthFor(start_minf);
+        lengthFor(start_mdia);
+    }
+
+    private byte[] make_hdlr(Hdlr hdlr) {
+        ByteBuffer buffer = ByteBuffer.wrap(new byte[]{
+                0x00, 0x00, 0x00, 0x77, 0x68, 0x64, 0x6C, 0x72,// hdlr
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                // binary string "ISO Media file created in NewPipe (A libre lightweight streaming frontend for Android)."
+                0x49, 0x53, 0x4F, 0x20, 0x4D, 0x65, 0x64, 0x69, 0x61, 0x20, 0x66, 0x69, 0x6C, 0x65, 0x20, 0x63,
+                0x72, 0x65, 0x61, 0x74, 0x65, 0x64, 0x20, 0x69, 0x6E, 0x20, 0x4E, 0x65, 0x77, 0x50, 0x69, 0x70,
+                0x65, 0x20, 0x28, 0x41, 0x20, 0x6C, 0x69, 0x62, 0x72, 0x65, 0x20, 0x6C, 0x69, 0x67, 0x68, 0x74,
+                0x77, 0x65, 0x69, 0x67, 0x68, 0x74, 0x20, 0x73, 0x74, 0x72, 0x65, 0x61, 0x6D, 0x69, 0x6E, 0x67,
+                0x20, 0x66, 0x72, 0x6F, 0x6E, 0x74, 0x65, 0x6E, 0x64, 0x20, 0x66, 0x6F, 0x72, 0x20, 0x41, 0x6E,
+                0x64, 0x72, 0x6F, 0x69, 0x64, 0x29, 0x2E
+        });
+
+        buffer.position(12);
+        buffer.putInt(hdlr.type);
+        buffer.putInt(hdlr.subType);
+        buffer.put(hdlr.bReserved);// always is a zero array
+
+        return buffer.array();
+    }
+    //</editor-fold>
+
+    class TablesInfo {
+
+        public int stts;
+        public int stsc;
+        public int[] stsc_bEntries;
+        public int ctts;
+        public int stsz;
+        public int stsz_default;
+        public int stss;
+        public int stco;
+    }
+}

app/src/main/java/org/schabi/newpipe/streams/SubtitleConverter.java

@@ -1,5 +1,6 @@
 package org.schabi.newpipe.streams;
 
+import org.schabi.newpipe.streams.io.SharpStream;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.w3c.dom.Node;
@@ -12,8 +13,6 @@ import java.nio.charset.Charset;
 import java.text.ParseException;
 import java.util.Locale;
 
-import org.schabi.newpipe.streams.io.SharpStream;
-
 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.ParserConfigurationException;
@@ -70,7 +69,7 @@ public class SubtitleConverter {
          * Language parsing is not supported
          */
 
-        byte[] buffer = new byte[source.available()];
+        byte[] buffer = new byte[(int) source.available()];
         source.read(buffer);
 
         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
@@ -206,7 +205,7 @@ public class SubtitleConverter {
         }
     }
 
-    private static NodeList selectNodes(Document xml, String[] path, String namespaceUri) throws XPathExpressionException {
+    private static NodeList selectNodes(Document xml, String[] path, String namespaceUri) {
         Element ref = xml.getDocumentElement();
 
         for (int i = 0; i < path.length - 1; i++) {

app/src/main/java/org/schabi/newpipe/streams/TrackDataChunk.java

@@ -1,65 +0,0 @@
-package org.schabi.newpipe.streams;
-
-import java.io.InputStream;
-import java.io.IOException;
-
-public class TrackDataChunk extends InputStream {
-
-    private final DataReader base;
-    private int size;
-
-    public TrackDataChunk(DataReader base, int size) {
-        this.base = base;
-        this.size = size;
-    }
-
-    @Override
-    public int read() throws IOException {
-        if (size < 1) {
-            return -1;
-        }
-
-        int res = base.read();
-
-        if (res >= 0) {
-            size--;
-        }
-
-        return res;
-    }
-
-    @Override
-    public int read(byte[] buffer) throws IOException {
-        return read(buffer, 0, buffer.length);
-    }
-
-    @Override
-    public int read(byte[] buffer, int offset, int count) throws IOException {
-        count = Math.min(size, count);
-        int read = base.read(buffer, offset, count);
-        size -= count;
-        return read;
-    }
-
-    @Override
-    public long skip(long amount) throws IOException {
-        long res = base.skipBytes(Math.min(amount, size));
-        size -= res;
-        return res;
-    }
-
-    @Override
-    public int available() {
-        return size;
-    }
-
-    @Override
-    public void close() {
-        size = 0;
-    }
-
-    @Override
-    public boolean markSupported() {
-        return false;
-    }
-}

app/src/main/java/org/schabi/newpipe/streams/WebMReader.java

@@ -1,12 +1,13 @@
 package org.schabi.newpipe.streams;
 
+import org.schabi.newpipe.streams.io.SharpStream;
+
 import java.io.EOFException;
 import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.NoSuchElementException;
-import java.util.Objects;
-
-import org.schabi.newpipe.streams.io.SharpStream;
 
 /**
  *
@@ -121,7 +122,7 @@ public class WebMReader {
     }
 
     private String readString(Element parent) throws IOException {
-        return new String(readBlob(parent), "utf-8");
+        return new String(readBlob(parent), StandardCharsets.UTF_8);// or use "utf-8"
     }
 
     private byte[] readBlob(Element parent) throws IOException {
@@ -193,6 +194,7 @@ public class WebMReader {
                     return elem;
                 }
             }
+
             ensure(elem);
         }
 
@@ -306,7 +308,7 @@ public class WebMReader {
                         entry.trackNumber = readNumber(elem);
                         break;
                     case ID_TrackType:
-                        entry.trackType = (int)readNumber(elem);
+                        entry.trackType = (int) readNumber(elem);
                         break;
                     case ID_CodecID:
                         entry.codecId = readString(elem);
@@ -445,7 +447,7 @@ public class WebMReader {
 
     public class SimpleBlock {
 
-        public TrackDataChunk data;
+        public InputStream data;
 
         SimpleBlock(Element ref) {
             this.ref = ref;
@@ -492,7 +494,7 @@ public class WebMReader {
 
                 currentSimpleBlock = readSimpleBlock(elem);
                 if (currentSimpleBlock.trackNumber == tracks[selectedTrack].trackNumber) {
-                    currentSimpleBlock.data = new TrackDataChunk(stream, (int) currentSimpleBlock.dataSize);
+                    currentSimpleBlock.data = stream.getView((int) currentSimpleBlock.dataSize);
                     return currentSimpleBlock;
                 }
 

app/src/main/java/org/schabi/newpipe/streams/WebMWriter.java

@@ -1,20 +1,20 @@
 package org.schabi.newpipe.streams;
 
+import android.support.annotation.NonNull;
+
 import org.schabi.newpipe.streams.WebMReader.Cluster;
 import org.schabi.newpipe.streams.WebMReader.Segment;
 import org.schabi.newpipe.streams.WebMReader.SimpleBlock;
 import org.schabi.newpipe.streams.WebMReader.WebMTrack;
+import org.schabi.newpipe.streams.io.SharpStream;
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.UnsupportedEncodingException;
 import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 
-import org.schabi.newpipe.streams.io.SharpStream;
-
 /**
- *
  * @author kapodamy
  */
 public class WebMWriter {
@@ -94,10 +94,6 @@ public class WebMWriter {
         }
     }
 
-    public long getBytesWritten() {
-        return written;
-    }
-
     public boolean isDone() {
         return done;
     }
@@ -200,7 +196,6 @@ public class WebMWriter {
         long nextCueTime = infoTracks[cuesForTrackId].trackType == 1 ? -1 : 0;
         ArrayList<KeyFrame> keyFrames = new ArrayList<>(32);
 
-        //ArrayList<Block> chunks = new ArrayList<>(readers.length);
         ArrayList<Long> clusterOffsets = new ArrayList<>(32);
         ArrayList<Integer> clusterSizes = new ArrayList<>(32);
 
@@ -283,24 +278,21 @@ public class WebMWriter {
 
         long segmentSize = written - offsetSegmentSizeSet - 7;
 
-        // final step write offsets and sizes
+        /* ---- final step write offsets and sizes ---- */
-        out.rewind();
+        seekTo(out, offsetSegmentSizeSet);
-        written = 0;
-
-        skipTo(out, offsetSegmentSizeSet);
         writeLong(out, segmentSize);
 
         if (predefinedDurations[durationFromTrackId] > -1) {
             duration += predefinedDurations[durationFromTrackId];// this value is full-filled in makeTrackEntry() method
         }
-        skipTo(out, offsetInfoDurationSet);
+        seekTo(out, offsetInfoDurationSet);
         writeFloat(out, duration);
 
         firstClusterOffset -= baseSegmentOffset;
-        skipTo(out, offsetClusterSet);
+        seekTo(out, offsetClusterSet);
         writeInt(out, firstClusterOffset);
 
-        skipTo(out, cueReservedOffset);
+        seekTo(out, cueReservedOffset);
 
         /* Cue */
         dump(new byte[]{0x1c, 0x53, (byte) 0xbb, 0x6b, 0x20, 0x00, 0x00}, out);
@@ -321,17 +313,14 @@ public class WebMWriter {
         voidBuffer.putShort((short) (firstClusterOffset - written - 4));
         dump(voidBuffer.array(), out);
 
-        out.rewind();
+        seekTo(out, offsetCuesSet);
-        written = 0;
-
-        skipTo(out, offsetCuesSet);
         writeInt(out, (int) (cueReservedOffset - baseSegmentOffset));
 
-        skipTo(out, cueReservedOffset + 5);
+        seekTo(out, cueReservedOffset + 5);
         writeShort(out, cueSize);
 
         for (int i = 0; i < clusterSizes.size(); i++) {
-            skipTo(out, clusterOffsets.get(i));
+            seekTo(out, clusterOffsets.get(i));
             byte[] size = ByteBuffer.allocate(4).putInt(clusterSizes.get(i) | 0x200000).array();
             out.write(size, 1, 3);
             written += 3;
@@ -365,20 +354,29 @@ public class WebMWriter {
         bloq.dataSize = (int) res.dataSize;
         bloq.trackNumber = internalTrackId;
         bloq.flags = res.flags;
-        bloq.absoluteTimecode = convertTimecode(res.relativeTimeCode, readersSegment[internalTrackId].info.timecodeScale, DEFAULT_TIMECODE_SCALE);
+        bloq.absoluteTimecode = convertTimecode(res.relativeTimeCode, readersSegment[internalTrackId].info.timecodeScale);
         bloq.absoluteTimecode += readersCluter[internalTrackId].timecode;
 
         return bloq;
     }
 
-    private short convertTimecode(int time, long oldTimeScale, int newTimeScale) {
+    private short convertTimecode(int time, long oldTimeScale) {
-        return (short) (time * (newTimeScale / oldTimeScale));
+        return (short) (time * (DEFAULT_TIMECODE_SCALE / oldTimeScale));
     }
 
-    private void skipTo(SharpStream stream, long absoluteOffset) throws IOException {
+    private void seekTo(SharpStream stream, long offset) throws IOException {
-        absoluteOffset -= written;
+        if (stream.canSeek()) {
-        written += absoluteOffset;
+            stream.seek(offset);
-        stream.skip(absoluteOffset);
+        } else {
+            if (offset > written) {
+                stream.skip(offset - written);
+            } else {
+                stream.rewind();
+                stream.skip(offset);
+            }
+        }
+
+        written = offset;
     }
 
     private void writeLong(SharpStream stream, long number) throws IOException {
@@ -618,9 +616,10 @@ public class WebMWriter {
 
         int offset = withLength ? 1 : 0;
         byte[] buffer = new byte[offset + length];
-        long marker = (long) Math.floor((length - 1) / 8);
+        long marker = (long) Math.floor((length - 1f) / 8f);
 
-        for (int i = length - 1, mul = 1; i >= 0; i--, mul *= 0x100) {
+        float mul = 1;
+        for (int i = length - 1; i >= 0; i--, mul *= 0x100) {
             long b = (long) Math.floor(number / mul);
             if (!withLength && i == marker) {
                 b = b | (0x80 >> (length - 1));
@@ -637,11 +636,7 @@ public class WebMWriter {
 
     private ArrayList<byte[]> encode(String value) {
         byte[] str;
-        try {
+        str = value.getBytes(StandardCharsets.UTF_8);// or use "utf-8"
-            str = value.getBytes("utf-8");
-        } catch (UnsupportedEncodingException err) {
-            str = value.getBytes();
-        }
 
         ArrayList<byte[]> buffer = new ArrayList<>(2);
         buffer.add(encode(str.length, false));
@@ -720,9 +715,10 @@ public class WebMWriter {
             return (flags & 0x80) == 0x80;
         }
 
+        @NonNull
         @Override
         public String toString() {
-            return String.format("trackNumber=%s  isKeyFrame=%S  absoluteTimecode=%s", trackNumber, (flags & 0x80) == 0x80, absoluteTimecode);
+            return String.format("trackNumber=%s  isKeyFrame=%S  absoluteTimecode=%s", trackNumber, isKeyframe(), absoluteTimecode);
         }
     }
 }

app/src/main/java/org/schabi/newpipe/streams/io/SharpStream.java

@@ -3,7 +3,7 @@ package org.schabi.newpipe.streams.io;
 import java.io.IOException;
 
 /**
- * based c#
+ * based on c#
  */
 public abstract class SharpStream {
 
@@ -15,23 +15,27 @@ public abstract class SharpStream {
 
     public abstract long skip(long amount) throws IOException;
 
-
+    public abstract long available();
-    public abstract int available();
 
     public abstract void rewind() throws IOException;
 
-
     public abstract void dispose();
 
     public abstract boolean isDisposed();
 
-
     public abstract boolean canRewind();
 
     public abstract boolean canRead();
 
     public abstract boolean canWrite();
 
+    public boolean canSetLength() {
+        return false;
+    }
+
+    public boolean canSeek() {
+        return false;
+    }
 
     public abstract void write(byte value) throws IOException;
 
@@ -39,9 +43,15 @@ public abstract class SharpStream {
 
     public abstract void write(byte[] buffer, int offset, int count) throws IOException;
 
-    public abstract void flush() throws IOException;
+    public void flush() throws IOException {
+        // STUB
+    }
 
     public void setLength(long length) throws IOException {
         throw new IOException("Not implemented");
     }
+
+    public void seek(long offset) throws IOException {
+        throw new IOException("Not implemented");
+    }
 }

app/src/main/java/org/schabi/newpipe/util/ListHelper.java

@@ -430,24 +430,26 @@ public final class ListHelper {
      */
     private static String getResolutionLimit(Context context) {
         String resolutionLimit = null;
-        if (!isWifiActive(context)) {
+        if (isMeteredNetwork(context)) {
             SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
             String defValue = context.getString(R.string.limit_data_usage_none_key);
             String value = preferences.getString(
                     context.getString(R.string.limit_mobile_data_usage_key), defValue);
-            resolutionLimit = value.equals(defValue) ? null : value;
+            resolutionLimit = defValue.equals(value) ? null : value;
         }
         return resolutionLimit;
     }
 
     /**
-     * Are we connected to wifi?
+     * The current network is metered (like mobile data)?
      * @param context App context
-     * @return {@code true} if connected to wifi
+     * @return {@code true} if connected to a metered network
      */
-    private static boolean isWifiActive(Context context)
+    private static boolean isMeteredNetwork(Context context)
     {
         ConnectivityManager manager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
-        return manager != null && manager.getActiveNetworkInfo() != null && manager.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;
+        if (manager == null || manager.getActiveNetworkInfo() == null) return false;
+
+        return manager.isActiveNetworkMetered();
     }
 }

app/src/main/java/org/schabi/newpipe/util/SecondaryStreamHelper.java

@@ -38,7 +38,7 @@ public class SecondaryStreamHelper<T extends Stream> {
     public static AudioStream getAudioStreamFor(@NonNull List<AudioStream> audioStreams, @NonNull VideoStream videoStream) {
         switch (videoStream.getFormat()) {
             case WEBM:
-            case MPEG_4:
+            case MPEG_4:// ¿is mpeg-4 DASH?
                 break;
             default:
                 return null;

app/src/main/java/us/shandian/giga/get/DownloadInitializer.java

@@ -164,9 +164,6 @@ public class DownloadInitializer extends Thread {
             }
         }
 
-        // hide marquee in the progress bar
-        mMission.done++;
-
         mMission.start();
     }
 

app/src/main/java/us/shandian/giga/get/DownloadMission.java

@@ -40,6 +40,9 @@ public class DownloadMission extends Mission {
     public static final int ERROR_UNKNOWN_HOST = 1005;
     public static final int ERROR_CONNECT_HOST = 1006;
     public static final int ERROR_POSTPROCESSING = 1007;
+    public static final int ERROR_POSTPROCESSING_STOPPED = 1008;
+    public static final int ERROR_POSTPROCESSING_HOLD = 1009;
+    public static final int ERROR_INSUFFICIENT_STORAGE = 1010;
     public static final int ERROR_HTTP_NO_CONTENT = 204;
     public static final int ERROR_HTTP_UNSUPPORTED_RANGE = 206;
 
@@ -83,8 +86,9 @@ public class DownloadMission extends Mission {
      * 0: ready
      * 1: running
      * 2: completed
+     * 3: hold
      */
-    public int postprocessingState;
+    public volatile int postprocessingState;
 
     /**
      * Indicate if the post-processing algorithm works on the same file
@@ -92,19 +96,19 @@ public class DownloadMission extends Mission {
     public boolean postprocessingThis;
 
     /**
-     * The current resource to download {@code urls[current]}
+     * The current resource to download, see {@code urls[current]} and {@code offsets[current]}
      */
     public int current;
 
     /**
      * Metadata where the mission state is saved
      */
-    public File metadata;
+    public transient File metadata;
 
     /**
      * maximum attempts
      */
-    public int maxRetry;
+    public transient int maxRetry;
 
     /**
      * Approximated final length, this represent the sum of all resources sizes
@@ -115,11 +119,11 @@ public class DownloadMission extends Mission {
     boolean fallback;
     private int finishCount;
     public transient boolean running;
-    public transient boolean enqueued = true;
+    public boolean enqueued;
 
     public int errCode = ERROR_NOTHING;
 
-    public transient Exception errObject = null;
+    public Exception errObject = null;
     public transient boolean recovered;
     public transient Handler mHandler;
     private transient boolean mWritingToFile;
@@ -131,7 +135,7 @@ public class DownloadMission extends Mission {
 
     private transient boolean deleted;
     int currentThreadCount;
-    private transient Thread[] threads = new Thread[0];
+    public transient volatile Thread[] threads = new Thread[0];
     private transient Thread init = null;
 
 
@@ -155,6 +159,8 @@ public class DownloadMission extends Mission {
         this.location = location;
         this.kind = kind;
         this.offsets = new long[urls.length];
+        this.enqueued = true;
+        this.maxRetry = 3;
 
         if (postprocessingName != null) {
             Postprocessing algorithm = Postprocessing.getAlgorithm(postprocessingName, null);
@@ -183,6 +189,7 @@ public class DownloadMission extends Mission {
      */
     boolean isBlockPreserved(long block) {
         checkBlock(block);
+        //noinspection ConstantConditions
         return blockState.containsKey(block) ? blockState.get(block) : false;
     }
 
@@ -247,6 +254,12 @@ public class DownloadMission extends Mission {
         HttpURLConnection conn = (HttpURLConnection) url.openConnection();
         conn.setInstanceFollowRedirects(true);
 
+        // BUG workaround: switching between networks can freeze the download forever
+
+        //conn.setRequestProperty("Connection", "close");
+        conn.setConnectTimeout(30000);
+        conn.setReadTimeout(10000);
+
         if (rangeStart >= 0) {
             String req = "bytes=" + rangeStart + "-";
             if (rangeEnd > 0) req += rangeEnd;
@@ -342,11 +355,32 @@ public class DownloadMission extends Mission {
         }
     }
 
-    synchronized void notifyError(int code, Exception err) {
+    public synchronized void notifyError(int code, Exception err) {
         Log.e(TAG, "notifyError() code = " + code, err);
 
+        if (err instanceof IOException) {
+            if (err.getMessage().contains("Permission denied")) {
+                code = ERROR_PERMISSION_DENIED;
+                err = null;
+            } else if (err.getMessage().contains("write failed: ENOSPC")) {
+                code = ERROR_INSUFFICIENT_STORAGE;
+                err = null;
+            } else {
+                try {
+                    File storage = new File(location);
+                    if (storage.canWrite() && storage.getUsableSpace() < (getLength() - done)) {
+                        code = ERROR_INSUFFICIENT_STORAGE;
+                        err = null;
+                    }
+                } catch (SecurityException e) {
+                    // is a permission error
+                }
+            }
+        }
+
         errCode = code;
         errObject = err;
+        enqueued = false;
 
         pause();
 
@@ -378,6 +412,7 @@ public class DownloadMission extends Mission {
 
             if (!doPostprocessing()) return;
 
+            enqueued = false;
             running = false;
             deleteThisFromFile();
 
@@ -386,7 +421,6 @@ public class DownloadMission extends Mission {
     }
 
     private void notifyPostProcessing(int state) {
-        if (DEBUG) {
         String action;
         switch (state) {
             case 1:
@@ -400,7 +434,6 @@ public class DownloadMission extends Mission {
         }
 
         Log.d(TAG, action + " postprocessing on " + location + File.separator + name);
-        }
 
         synchronized (blockState) {
             // don't return without fully write the current state
@@ -420,7 +453,6 @@ public class DownloadMission extends Mission {
         if (threads != null)
             for (Thread thread : threads) joinForThread(thread);
 
-        enqueued = false;
         running = true;
         errCode = ERROR_NOTHING;
 
@@ -463,7 +495,7 @@ public class DownloadMission extends Mission {
     }
 
     /**
-     * Pause the mission, does not affect the blocks that are being downloaded.
+     * Pause the mission
      */
     public synchronized void pause() {
         if (!running) return;
@@ -477,7 +509,6 @@ public class DownloadMission extends Mission {
 
         running = false;
         recovered = true;
-        enqueued = false;
 
         if (init != null && Thread.currentThread() != init && init.isAlive()) {
             init.interrupt();
@@ -514,7 +545,7 @@ public class DownloadMission extends Mission {
     }
 
     /**
-     * Removes the file and the meta file
+     * Removes the downloaded file and the meta file
      */
     @Override
     public boolean delete() {
@@ -580,12 +611,21 @@ public class DownloadMission extends Mission {
      * @return true, otherwise, false
      */
     public boolean isPsRunning() {
-        return postprocessingName != null && postprocessingState == 1;
+        return postprocessingName != null && (postprocessingState == 1 || postprocessingState == 3);
+    }
+
+    /**
+     * Indicated if the mission is ready
+     *
+     * @return true, otherwise, false
+     */
+    public boolean isInitialized() {
+        return blocks >= 0; // DownloadMissionInitializer was executed
     }
 
     public long getLength() {
         long calculated;
-        if (postprocessingState == 1) {
+        if (postprocessingState == 1 || postprocessingState == 3) {
             calculated = length;
         } else {
             calculated = offsets[current < offsets.length ? current : (offsets.length - 1)] + length;
@@ -596,14 +636,38 @@ public class DownloadMission extends Mission {
         return calculated > nearLength ? calculated : nearLength;
     }
 
+    /**
+     * set this mission state on the queue
+     *
+     * @param queue true to add to the queue, otherwise, false
+     */
+    public void setEnqueued(boolean queue) {
+        enqueued = queue;
+        runAsync(-2, this::writeThisToFile);
+    }
+
+    /**
+     * Attempts to continue a blocked post-processing
+     *
+     * @param recover {@code true} to retry, otherwise, {@code false} to cancel
+     */
+    public void psContinue(boolean recover) {
+        postprocessingState = 1;
+        errCode = recover ? ERROR_NOTHING : ERROR_POSTPROCESSING;
+        threads[0].interrupt();
+    }
+
     private boolean doPostprocessing() {
         if (postprocessingName == null || postprocessingState == 2) return true;
 
         notifyPostProcessing(1);
         notifyProgress(0);
 
+        if (DEBUG)
             Thread.currentThread().setName("[" + TAG + "]  post-processing = " + postprocessingName + "  filename = " + name);
 
+        threads = new Thread[]{Thread.currentThread()};
+
         Exception exception = null;
 
         try {

app/src/main/java/us/shandian/giga/get/Mission.java

@@ -47,6 +47,11 @@ public abstract class Mission implements Serializable {
         return new File(location, name);
     }
 
+    /**
+     * Delete the downloaded file
+     *
+     * @return {@code true] if and only if the file is successfully deleted, otherwise, {@code false}
+     */
     public boolean delete() {
         deleted = true;
         return getDownloadedFile().delete();

app/src/main/java/us/shandian/giga/postprocessing/M4aNoDash.java

@@ -0,0 +1,43 @@
+package us.shandian.giga.postprocessing;
+
+import org.schabi.newpipe.streams.Mp4DashReader;
+import org.schabi.newpipe.streams.Mp4FromDashWriter;
+import org.schabi.newpipe.streams.io.SharpStream;
+
+import java.io.IOException;
+
+import us.shandian.giga.get.DownloadMission;
+
+public class M4aNoDash extends Postprocessing {
+
+    M4aNoDash(DownloadMission mission) {
+        super(mission, 0, true);
+    }
+
+    @Override
+    boolean test(SharpStream... sources) throws IOException {
+        // check if the mp4 file is DASH (youtube)
+
+        Mp4DashReader reader = new Mp4DashReader(sources[0]);
+        reader.parse();
+
+        switch (reader.getBrands()[0]) {
+            case 0x64617368:// DASH
+            case 0x69736F35:// ISO5
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    @Override
+    int process(SharpStream out, SharpStream... sources) throws IOException {
+        Mp4FromDashWriter muxer = new Mp4FromDashWriter(sources[0]);
+        muxer.setMainBrand(0x4D344120);// binary string "M4A "
+        muxer.parseSources();
+        muxer.selectTracks(0);
+        muxer.build(out);
+
+        return OK_RESULT;
+    }
+}

app/src/main/java/us/shandian/giga/postprocessing/Mp4FromDashMuxer.java

@@ -1,6 +1,6 @@
 package us.shandian.giga.postprocessing;
 
-import org.schabi.newpipe.streams.Mp4DashWriter;
+import org.schabi.newpipe.streams.Mp4FromDashWriter;
 import org.schabi.newpipe.streams.io.SharpStream;
 
 import java.io.IOException;
@@ -10,15 +10,15 @@ import us.shandian.giga.get.DownloadMission;
 /**
  * @author kapodamy
  */
-class Mp4DashMuxer extends Postprocessing {
+class Mp4FromDashMuxer extends Postprocessing {
 
-    Mp4DashMuxer(DownloadMission mission) {
+    Mp4FromDashMuxer(DownloadMission mission) {
-        super(mission, 15360 * 1024/* 15 MiB */, true);
+        super(mission, 2 * 1024 * 1024/* 2 MiB */, true);
     }
 
     @Override
     int process(SharpStream out, SharpStream... sources) throws IOException {
-        Mp4DashWriter muxer = new Mp4DashWriter(sources);
+        Mp4FromDashWriter muxer = new Mp4FromDashWriter(sources);
         muxer.parseSources();
         muxer.selectTracks(0, 0);
         muxer.build(out);

app/src/main/java/us/shandian/giga/postprocessing/Mp4Muxer.java

@@ -1,136 +0,0 @@
-package us.shandian.giga.postprocessing;
-
-import android.media.MediaCodec.BufferInfo;
-import android.media.MediaExtractor;
-import android.media.MediaMuxer;
-import android.media.MediaMuxer.OutputFormat;
-import android.util.Log;
-
-import static org.schabi.newpipe.BuildConfig.DEBUG;
-
-import org.schabi.newpipe.streams.io.SharpStream;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.nio.ByteBuffer;
-
-import us.shandian.giga.get.DownloadMission;
-
-
-class Mp4Muxer extends Postprocessing {
-    private static final String TAG = "Mp4Muxer";
-    private static final int NOTIFY_BYTES_INTERVAL = 128 * 1024;// 128 KiB
-
-    Mp4Muxer(DownloadMission mission) {
-        super(mission, 0, false);
-    }
-
-    @Override
-    int process(SharpStream out, SharpStream... sources) throws IOException {
-        File dlFile = mission.getDownloadedFile();
-        File tmpFile = new File(mission.location, mission.name.concat(".tmp"));
-
-        if (tmpFile.exists())
-            if (!tmpFile.delete()) return DownloadMission.ERROR_FILE_CREATION;
-
-        if (!tmpFile.createNewFile()) return DownloadMission.ERROR_FILE_CREATION;
-
-        FileInputStream source = null;
-        MediaMuxer muxer = null;
-
-        //noinspection TryFinallyCanBeTryWithResources
-        try {
-            source = new FileInputStream(dlFile);
-            MediaExtractor tracks[] = {
-                    getMediaExtractor(source, mission.offsets[0], mission.offsets[1] - mission.offsets[0]),
-                    getMediaExtractor(source, mission.offsets[1], mission.length - mission.offsets[1])
-            };
-
-            muxer = new MediaMuxer(tmpFile.getAbsolutePath(), OutputFormat.MUXER_OUTPUT_MPEG_4);
-
-            int tracksIndex[] = {
-                    muxer.addTrack(tracks[0].getTrackFormat(0)),
-                    muxer.addTrack(tracks[1].getTrackFormat(0))
-            };
-
-            ByteBuffer buffer = ByteBuffer.allocate(512 * 1024);// 512 KiB
-            BufferInfo info = new BufferInfo();
-
-            long written = 0;
-            long nextReport = NOTIFY_BYTES_INTERVAL;
-
-            muxer.start();
-
-            while (true) {
-                int done = 0;
-
-                for (int i = 0; i < tracks.length; i++) {
-                    if (tracksIndex[i] < 0) continue;
-
-                    info.set(0,
-                            tracks[i].readSampleData(buffer, 0),
-                            tracks[i].getSampleTime(),
-                            tracks[i].getSampleFlags()
-                    );
-
-                    if (info.size >= 0) {
-                        muxer.writeSampleData(tracksIndex[i], buffer, info);
-                        written += info.size;
-                        done++;
-                    }
-                    if (!tracks[i].advance()) {
-                        // EOF reached
-                        tracks[i].release();
-                        tracksIndex[i] = -1;
-                    }
-
-                    if (written > nextReport) {
-                        nextReport = written + NOTIFY_BYTES_INTERVAL;
-                        super.progressReport(written);
-                    }
-                }
-
-                if (done < 1) break;
-            }
-
-            // this part should not fail
-            if (!dlFile.delete()) return DownloadMission.ERROR_FILE_CREATION;
-            if (!tmpFile.renameTo(dlFile)) return DownloadMission.ERROR_FILE_CREATION;
-
-            return OK_RESULT;
-        } finally {
-            try {
-                if (muxer != null) {
-                    muxer.stop();
-                    muxer.release();
-                }
-            } catch (Exception err) {
-                if (DEBUG)
-                    Log.e(TAG, "muxer stop/release failed", err);
-            }
-
-            if (source != null) {
-                try {
-                    source.close();
-                } catch (IOException e) {
-                    // nothing to do
-                }
-            }
-
-            // if the operation fails, delete the temporal file
-            if (tmpFile.exists()) {
-                //noinspection ResultOfMethodCallIgnored
-                tmpFile.delete();
-            }
-        }
-    }
-
-    private MediaExtractor getMediaExtractor(FileInputStream source, long offset, long length) throws IOException {
-        MediaExtractor extractor = new MediaExtractor();
-        extractor.setDataSource(source.getFD(), offset, length);
-        extractor.selectTrack(0);
-
-        return extractor;
-    }
-}

app/src/main/java/us/shandian/giga/postprocessing/Postprocessing.java

@@ -1,6 +1,7 @@
 package us.shandian.giga.postprocessing;
 
 import android.os.Message;
+import android.util.Log;
 
 import org.schabi.newpipe.streams.io.SharpStream;
 
@@ -9,17 +10,22 @@ import java.io.IOException;
 
 import us.shandian.giga.get.DownloadMission;
 import us.shandian.giga.postprocessing.io.ChunkFileInputStream;
-import us.shandian.giga.postprocessing.io.CircularFile;
+import us.shandian.giga.postprocessing.io.CircularFileWriter;
+import us.shandian.giga.postprocessing.io.CircularFileWriter.OffsetChecker;
 import us.shandian.giga.service.DownloadManagerService;
 
+import static us.shandian.giga.get.DownloadMission.ERROR_NOTHING;
+import static us.shandian.giga.get.DownloadMission.ERROR_POSTPROCESSING_HOLD;
+import static us.shandian.giga.get.DownloadMission.ERROR_UNKNOWN_EXCEPTION;
+
 public abstract class Postprocessing {
 
-    static final byte OK_RESULT = DownloadMission.ERROR_NOTHING;
+    static final byte OK_RESULT = ERROR_NOTHING;
 
     public static final String ALGORITHM_TTML_CONVERTER = "ttml";
-    public static final String ALGORITHM_MP4_DASH_MUXER = "mp4D";
-    public static final String ALGORITHM_MP4_MUXER = "mp4";
     public static final String ALGORITHM_WEBM_MUXER = "webm";
+    public static final String ALGORITHM_MP4_FROM_DASH_MUXER = "mp4D-mp4";
+    public static final String ALGORITHM_M4A_NO_DASH = "mp4D-m4a";
 
     public static Postprocessing getAlgorithm(String algorithmName, DownloadMission mission) {
         if (null == algorithmName) {
@@ -27,12 +33,12 @@ public abstract class Postprocessing {
         } else switch (algorithmName) {
             case ALGORITHM_TTML_CONVERTER:
                 return new TtmlConverter(mission);
-            case ALGORITHM_MP4_DASH_MUXER:
-                return new Mp4DashMuxer(mission);
-            case ALGORITHM_MP4_MUXER:
-                return new Mp4Muxer(mission);
             case ALGORITHM_WEBM_MUXER:
                 return new WebMMuxer(mission);
+            case ALGORITHM_MP4_FROM_DASH_MUXER:
+                return new Mp4FromDashMuxer(mission);
+            case ALGORITHM_M4A_NO_DASH:
+                return new M4aNoDash(mission);
             /*case "example-algorithm":
                 return new ExampleAlgorithm(mission);*/
             default:
@@ -65,7 +71,8 @@ public abstract class Postprocessing {
 
     public void run() throws IOException {
         File file = mission.getDownloadedFile();
-        CircularFile out = null;
+        File temp = null;
+        CircularFileWriter out = null;
         int result;
         long finalLength = -1;
 
@@ -81,29 +88,54 @@ public abstract class Postprocessing {
                 }
                 sources[i] = new ChunkFileInputStream(file, mission.offsets[i], mission.getDownloadedFile().length(), "rw");
 
-                int[] idx = {0};
+                if (test(sources)) {
-                CircularFile.OffsetChecker checker = () -> {
+                    for (SharpStream source : sources) source.rewind();
-                    while (idx[0] < sources.length) {
+
+                    OffsetChecker checker = () -> {
+                        for (ChunkFileInputStream source : sources) {
                             /*
                              * WARNING: never use rewind() in any chunk after any writing (especially on first chunks)
-                         *          or the CircularFile can lead to unexpected results
+                             *          or the CircularFileWriter can lead to unexpected results
                              */
-                        if (sources[idx[0]].isDisposed() || sources[idx[0]].available() < 1) {
+                            if (source.isDisposed() || source.available() < 1) {
-                            idx[0]++;
                                 continue;// the selected source is not used anymore
                             }
 
-                        return sources[idx[0]].getFilePointer() - 1;
+                            return source.getFilePointer() - 1;
                         }
 
                         return -1;
                     };
-                out = new CircularFile(file, 0, this::progressReport, checker);
+
+                    temp = new File(mission.location, mission.name + ".tmp");
+
+                    out = new CircularFileWriter(file, temp, checker);
+                    out.onProgress = this::progressReport;
+
+                    out.onWriteError = (err) -> {
+                        mission.postprocessingState = 3;
+                        mission.notifyError(ERROR_POSTPROCESSING_HOLD, err);
+
+                        try {
+                            synchronized (this) {
+                                while (mission.postprocessingState == 3)
+                                    wait();
+                            }
+                        } catch (InterruptedException e) {
+                            // nothing to do
+                            Log.e(this.getClass().getSimpleName(), "got InterruptedException");
+                        }
+
+                        return mission.errCode == ERROR_NOTHING;
+                    };
 
                     result = process(out, sources);
 
                     if (result == OK_RESULT)
                         finalLength = out.finalizeFile();
+                } else {
+                    result = OK_RESULT;
+                }
             } finally {
                 for (SharpStream source : sources) {
                     if (source != null && !source.isDisposed()) {
@@ -113,17 +145,22 @@ public abstract class Postprocessing {
                 if (out != null) {
                     out.dispose();
                 }
+                if (temp != null) {
+                    //noinspection ResultOfMethodCallIgnored
+                    temp.delete();
+                }
             }
         } else {
-            result = process(null);
+            result = test() ? process(null) : OK_RESULT;
         }
 
         if (result == OK_RESULT) {
-            if (finalLength < 0) finalLength = file.length();
+            if (finalLength != -1) {
                 mission.done = finalLength;
                 mission.length = finalLength;
+            }
         } else {
-            mission.errCode = DownloadMission.ERROR_UNKNOWN_EXCEPTION;
+            mission.errCode = ERROR_UNKNOWN_EXCEPTION;
             mission.errObject = new RuntimeException("post-processing algorithm returned " + result);
         }
 
@@ -134,7 +171,18 @@ public abstract class Postprocessing {
     }
 
     /**
-     * Abstract method to execute the pos-processing algorithm
+     * Test if the post-processing algorithm can be skipped
+     *
+     * @param sources files to be processed
+     * @return {@code true} if the post-processing is required, otherwise, {@code false}
+     * @throws IOException if an I/O error occurs.
+     */
+    boolean test(SharpStream... sources) throws IOException {
+        return true;
+    }
+
+    /**
+     * Abstract method to execute the post-processing algorithm
      *
      * @param out     output stream
      * @param sources files to be processed
@@ -151,7 +199,7 @@ public abstract class Postprocessing {
         return mission.postprocessingArgs[index];
     }
 
-    void progressReport(long done) {
+    private void progressReport(long done) {
         mission.done = done;
         if (mission.length < mission.done) mission.length = mission.done;
 

app/src/main/java/us/shandian/giga/postprocessing/io/ChunkFileInputStream.java

@@ -94,7 +94,7 @@ public class ChunkFileInputStream extends SharpStream {
     }
 
     @Override
-    public int available() {
+    public long available() {
         return (int) (length - position);
     }
 
@@ -147,7 +147,4 @@ public class ChunkFileInputStream extends SharpStream {
     public void write(byte[] buffer, int offset, int count) {
     }
 
-    @Override
-    public void flush() {
-    }
 }

app/src/main/java/us/shandian/giga/postprocessing/io/CircularFile.java

@@ -1,375 +0,0 @@
-package us.shandian.giga.postprocessing.io;
-
-import org.schabi.newpipe.streams.io.SharpStream;
-
-import java.io.File;
-import java.io.IOException;
-import java.io.RandomAccessFile;
-import java.util.ArrayList;
-
-public class CircularFile extends SharpStream {
-
-    private final static int AUX_BUFFER_SIZE = 1024 * 1024;// 1 MiB
-    private final static int AUX_BUFFER_SIZE2 = 512 * 1024;// 512 KiB
-    private final static int NOTIFY_BYTES_INTERVAL = 64 * 1024;// 64 KiB
-    private final static int QUEUE_BUFFER_SIZE = 8 * 1024;// 8 KiB
-    private final static boolean IMMEDIATE_AUX_BUFFER_FLUSH = false;
-
-    private RandomAccessFile out;
-    private long position;
-    private long maxLengthKnown = -1;
-
-    private ArrayList<ManagedBuffer> auxiliaryBuffers;
-    private OffsetChecker callback;
-    private ManagedBuffer queue;
-    private long startOffset;
-    private ProgressReport onProgress;
-    private long reportPosition;
-
-    public CircularFile(File file, long offset, ProgressReport progressReport, OffsetChecker checker) throws IOException {
-        if (checker == null) {
-            throw new NullPointerException("checker is null");
-        }
-
-        try {
-            queue = new ManagedBuffer(QUEUE_BUFFER_SIZE);
-            out = new RandomAccessFile(file, "rw");
-            out.seek(offset);
-            position = offset;
-        } catch (IOException err) {
-            try {
-                if (out != null) {
-                    out.close();
-                }
-            } catch (IOException e) {
-                // nothing to do
-            }
-            throw err;
-        }
-
-        auxiliaryBuffers = new ArrayList<>(15);
-        callback = checker;
-        startOffset = offset;
-        reportPosition = offset;
-        onProgress = progressReport;
-
-    }
-
-    /**
-     * Close the file without flushing any buffer
-     */
-    @Override
-    public void dispose() {
-        try {
-            auxiliaryBuffers = null;
-            if (out != null) {
-                out.close();
-                out = null;
-            }
-        } catch (IOException err) {
-            // nothing to do
-        }
-    }
-
-    /**
-     * Flush any buffer and close the output file. Use this method if the
-     * operation is successful
-     *
-     * @return the final length of the file
-     * @throws IOException if an I/O error occurs
-     */
-    public long finalizeFile() throws IOException {
-        flushEverything();
-
-        if (maxLengthKnown > -1) {
-            position = maxLengthKnown;
-        }
-        if (position < out.length()) {
-            out.setLength(position);
-        }
-
-        dispose();
-
-        return position;
-    }
-
-    @Override
-    public void write(byte b) throws IOException {
-        write(new byte[]{b}, 0, 1);
-    }
-
-    @Override
-    public void write(byte b[]) throws IOException {
-        write(b, 0, b.length);
-    }
-
-    @Override
-    public void write(byte b[], int off, int len) throws IOException {
-        if (len == 0) {
-            return;
-        }
-
-        long end = callback.check();
-        long available;
-
-        if (end == -1) {
-            available = Long.MAX_VALUE;
-        } else {
-            if (end < startOffset) {
-                throw new IOException("The reported offset is invalid. reported offset is " + String.valueOf(end));
-            }
-            available = end - position;
-        }
-
-        // Check if possible flush one or more auxiliary buffer
-        if (auxiliaryBuffers.size() > 0) {
-            ManagedBuffer aux = auxiliaryBuffers.get(0);
-
-            // check if there is enough space to flush it completely
-            while (available >= (aux.size + queue.size)) {
-                available -= aux.size;
-                writeQueue(aux.buffer, 0, aux.size);
-                aux.dereference();
-                auxiliaryBuffers.remove(0);
-
-                if (auxiliaryBuffers.size() < 1) {
-                    aux = null;
-                    break;
-                }
-                aux = auxiliaryBuffers.get(0);
-            }
-
-            if (IMMEDIATE_AUX_BUFFER_FLUSH) {
-                // try partial flush to avoid allocate another auxiliary buffer
-                if (aux != null && aux.available() < len && available > queue.size) {
-                    int size = Math.min(aux.size, (int) available - queue.size);
-
-                    writeQueue(aux.buffer, 0, size);
-                    aux.dereference(size);
-
-                    available -= size;
-                }
-            }
-        }
-
-        if (auxiliaryBuffers.size() < 1 && available > (len + queue.size)) {
-            writeQueue(b, off, len);
-        } else {
-            int i = auxiliaryBuffers.size() - 1;
-            while (len > 0) {
-                if (i < 0) {
-                    // allocate a new auxiliary buffer
-                    auxiliaryBuffers.add(new ManagedBuffer(AUX_BUFFER_SIZE));
-                    i++;
-                }
-
-                ManagedBuffer aux = auxiliaryBuffers.get(i);
-                available = aux.available();
-
-                if (available < 1) {
-                    // secondary auxiliary buffer
-                    available = len;
-                    aux = new ManagedBuffer(Math.max(len, AUX_BUFFER_SIZE2));
-                    auxiliaryBuffers.add(aux);
-                    i++;
-                } else {
-                    available = Math.min(len, available);
-                }
-
-                aux.write(b, off, (int) available);
-
-                len -= available;
-                if (len > 0) off += available;
-            }
-        }
-    }
-
-    private void writeOutside(byte buffer[], int offset, int length) throws IOException {
-        out.write(buffer, offset, length);
-        position += length;
-
-        if (onProgress != null && position > reportPosition) {
-            reportPosition = position + NOTIFY_BYTES_INTERVAL;
-            onProgress.report(position);
-        }
-    }
-
-    private void writeQueue(byte[] buffer, int offset, int length) throws IOException {
-        while (length > 0) {
-            if (queue.available() < length) {
-                flushQueue();
-
-                if (length >= queue.buffer.length) {
-                    writeOutside(buffer, offset, length);
-                    return;
-                }
-            }
-
-            int size = Math.min(queue.available(), length);
-            queue.write(buffer, offset, size);
-
-            offset += size;
-            length -= size;
-        }
-
-        if (queue.size >= queue.buffer.length) {
-            flushQueue();
-        }
-    }
-
-    private void flushQueue() throws IOException {
-        writeOutside(queue.buffer, 0, queue.size);
-        queue.size = 0;
-    }
-
-    private void flushEverything() throws IOException {
-        flushQueue();
-
-        if (auxiliaryBuffers.size() > 0) {
-            for (ManagedBuffer aux : auxiliaryBuffers) {
-                writeOutside(aux.buffer, 0, aux.size);
-                aux.dereference();
-            }
-            auxiliaryBuffers.clear();
-        }
-    }
-
-    /**
-     * Flush any buffer directly to the file. Warning: use this method ONLY if
-     * all read dependencies are disposed
-     *
-     * @throws IOException if the dependencies are not disposed
-     */
-    @Override
-    public void flush() throws IOException {
-        if (callback.check() != -1) {
-            throw new IOException("All read dependencies of this file must be disposed first");
-        }
-        flushEverything();
-
-        // Save the current file length in case the method {@code rewind()} is called
-        if (position > maxLengthKnown) {
-            maxLengthKnown = position;
-        }
-    }
-
-    @Override
-    public void rewind() throws IOException {
-        flush();
-        out.seek(startOffset);
-
-        if (onProgress != null) {
-            onProgress.report(-position);
-        }
-
-        position = startOffset;
-        reportPosition = startOffset;
-
-    }
-
-    @Override
-    public long skip(long amount) throws IOException {
-        flush();
-        position += amount;
-
-        out.seek(position);
-
-        return amount;
-    }
-
-    @Override
-    public boolean isDisposed() {
-        return out == null;
-    }
-
-    @Override
-    public boolean canRewind() {
-        return true;
-    }
-
-    @Override
-    public boolean canWrite() {
-        return true;
-    }
-
-    //<editor-fold defaultState="collapsed" desc="stub read methods">
-    @Override
-    public boolean canRead() {
-        return false;
-    }
-
-    @Override
-    public int read() {
-        throw new UnsupportedOperationException("write-only");
-    }
-
-    @Override
-    public int read(byte[] buffer) {
-        throw new UnsupportedOperationException("write-only");
-    }
-
-    @Override
-    public int read(byte[] buffer, int offset, int count) {
-        throw new UnsupportedOperationException("write-only");
-    }
-
-    @Override
-    public int available() {
-        throw new UnsupportedOperationException("write-only");
-    }
-//</editor-fold>
-
-    public interface OffsetChecker {
-
-        /**
-         * Checks the amount of available space ahead
-         *
-         * @return absolute offset in the file where no more data SHOULD NOT be
-         * written. If the value is -1 the whole file will be used
-         */
-        long check();
-    }
-
-    public interface ProgressReport {
-
-        void report(long progress);
-    }
-
-    class ManagedBuffer {
-
-        byte[] buffer;
-        int size;
-
-        ManagedBuffer(int length) {
-            buffer = new byte[length];
-        }
-
-        void dereference() {
-            buffer = null;
-            size = 0;
-        }
-
-        void dereference(int amount) {
-            if (amount > size) {
-                throw new IndexOutOfBoundsException("Invalid dereference amount (" + amount + ">=" + size + ")");
-            }
-            size -= amount;
-            System.arraycopy(buffer, amount, buffer, 0, size);
-        }
-
-        protected int available() {
-            return buffer.length - size;
-        }
-
-        private void write(byte[] b, int off, int len) {
-            System.arraycopy(b, off, buffer, size, len);
-            size += len;
-        }
-
-        @Override
-        public String toString() {
-            return "holding: " + String.valueOf(size) + " length: " + String.valueOf(buffer.length) + " available: " + String.valueOf(available());
-        }
-
-    }
-}

app/src/main/java/us/shandian/giga/postprocessing/io/CircularFileWriter.java

@@ -0,0 +1,459 @@
+package us.shandian.giga.postprocessing.io;
+
+import android.support.annotation.NonNull;
+
+import org.schabi.newpipe.streams.io.SharpStream;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+
+public class CircularFileWriter extends SharpStream {
+
+    private final static int QUEUE_BUFFER_SIZE = 8 * 1024;// 8 KiB
+    private final static int NOTIFY_BYTES_INTERVAL = 64 * 1024;// 64 KiB
+    private final static int THRESHOLD_AUX_LENGTH = 3 * 1024 * 1024;// 3 MiB
+
+    private OffsetChecker callback;
+
+    public ProgressReport onProgress;
+    public WriteErrorHandle onWriteError;
+
+    private long reportPosition;
+    private long maxLengthKnown = -1;
+
+    private BufferedFile out;
+    private BufferedFile aux;
+
+    public CircularFileWriter(File source, File temp, OffsetChecker checker) throws IOException {
+        if (checker == null) {
+            throw new NullPointerException("checker is null");
+        }
+
+        if (!temp.exists()) {
+            if (!temp.createNewFile()) {
+                throw new IOException("Cannot create a temporal file");
+            }
+        }
+
+        aux = new BufferedFile(temp);
+        out = new BufferedFile(source);
+
+        callback = checker;
+
+        reportPosition = NOTIFY_BYTES_INTERVAL;
+    }
+
+    private void flushAuxiliar() throws IOException {
+        if (aux.length < 1) {
+            return;
+        }
+
+        boolean underflow = out.getOffset() >= out.length;
+
+        out.flush();
+        aux.flush();
+
+        aux.target.seek(0);
+        out.target.seek(out.length);
+
+        long length = aux.length;
+        out.length += aux.length;
+
+        while (length > 0) {
+            int read = (int) Math.min(length, Integer.MAX_VALUE);
+            read = aux.target.read(aux.queue, 0, Math.min(read, aux.queue.length));
+
+            out.writeProof(aux.queue, read);
+            length -= read;
+        }
+
+        if (underflow) {
+            out.offset += aux.offset;
+            out.target.seek(out.offset);
+        } else {
+            out.offset = out.length;
+        }
+
+        if (out.length > maxLengthKnown) {
+            maxLengthKnown = out.length;
+        }
+
+        if (aux.length > THRESHOLD_AUX_LENGTH) {
+            aux.target.setLength(THRESHOLD_AUX_LENGTH);// or setLength(0);
+        }
+
+        aux.reset();
+    }
+
+    /**
+     * Flush any buffer and close the output file. Use this method if the
+     * operation is successful
+     *
+     * @return the final length of the file
+     * @throws IOException if an I/O error occurs
+     */
+    public long finalizeFile() throws IOException {
+        flushAuxiliar();
+
+        out.flush();
+
+        // change file length (if required)
+        long length = Math.max(maxLengthKnown, out.length);
+        if (length != out.target.length()) {
+            out.target.setLength(length);
+        }
+
+        dispose();
+
+        return length;
+    }
+
+    /**
+     * Close the file without flushing any buffer
+     */
+    @Override
+    public void dispose() {
+        if (out != null) {
+            out.dispose();
+            out = null;
+        }
+        if (aux != null) {
+            aux.dispose();
+            aux = null;
+        }
+    }
+
+    @Override
+    public void write(byte b) throws IOException {
+        write(new byte[]{b}, 0, 1);
+    }
+
+    @Override
+    public void write(byte b[]) throws IOException {
+        write(b, 0, b.length);
+    }
+
+    @Override
+    public void write(byte b[], int off, int len) throws IOException {
+        if (len == 0) {
+            return;
+        }
+
+        long available;
+        long offsetOut = out.getOffset();
+        long offsetAux = aux.getOffset();
+        long end = callback.check();
+
+        if (end == -1) {
+            available = Integer.MAX_VALUE;
+        } else if (end < offsetOut) {
+            throw new IOException("The reported offset is invalid: " + String.valueOf(offsetOut));
+        } else {
+            available = end - offsetOut;
+        }
+
+        boolean usingAux = aux.length > 0 && offsetOut >= out.length;
+        boolean underflow = offsetAux < aux.length || offsetOut < out.length;
+
+        if (usingAux) {
+            // before continue calculate the final length of aux
+            long length = offsetAux + len;
+            if (underflow) {
+                if (aux.length > length) {
+                    length = aux.length;// the length is not changed
+                }
+            } else {
+                length = aux.length + len;
+            }
+
+            if (length > available || length < THRESHOLD_AUX_LENGTH) {
+                aux.write(b, off, len);
+            } else {
+                if (underflow) {
+                    aux.write(b, off, len);
+                    flushAuxiliar();
+                } else {
+                    flushAuxiliar();
+                    out.write(b, off, len);// write directly on the output
+                }
+            }
+        } else {
+            if (underflow) {
+                available = out.length - offsetOut;
+            }
+
+            int length = Math.min(len, (int) available);
+            out.write(b, off, length);
+
+            len -= length;
+            off += length;
+
+            if (len > 0) {
+                aux.write(b, off, len);
+            }
+        }
+
+        if (onProgress != null) {
+            long absoluteOffset = out.getOffset() + aux.getOffset();
+            if (absoluteOffset > reportPosition) {
+                reportPosition = absoluteOffset + NOTIFY_BYTES_INTERVAL;
+                onProgress.report(absoluteOffset);
+            }
+        }
+    }
+
+    @Override
+    public void flush() throws IOException {
+        aux.flush();
+        out.flush();
+
+        long total = out.length + aux.length;
+        if (total > maxLengthKnown) {
+            maxLengthKnown = total;// save the current file length in case the method {@code rewind()} is called
+        }
+    }
+
+    @Override
+    public long skip(long amount) throws IOException {
+        seek(out.getOffset() + aux.getOffset() + amount);
+        return amount;
+    }
+
+    @Override
+    public void rewind() throws IOException {
+        if (onProgress != null) {
+            onProgress.report(-out.length - aux.length);// rollback the whole progress
+        }
+
+        seek(0);
+
+        reportPosition = NOTIFY_BYTES_INTERVAL;
+    }
+
+    @Override
+    public void seek(long offset) throws IOException {
+        long total = out.length + aux.length;
+        if (offset == total) {
+            return;// nothing to do
+        }
+
+        // flush everything, avoid any underflow
+        flush();
+
+        if (offset < 0 || offset > total) {
+            throw new IOException("desired offset is outside of range=0-" + total + " offset=" + offset);
+        }
+
+        if (offset > out.length) {
+            out.seek(out.length);
+            aux.seek(offset - out.length);
+        } else {
+            out.seek(offset);
+            aux.seek(0);
+        }
+    }
+
+    @Override
+    public boolean isDisposed() {
+        return out == null;
+    }
+
+    @Override
+    public boolean canRewind() {
+        return true;
+    }
+
+    @Override
+    public boolean canWrite() {
+        return true;
+    }
+
+    @Override
+    public boolean canSeek() {
+        return true;
+    }
+
+    // <editor-fold defaultstate="collapsed" desc="stub read methods">
+    @Override
+    public boolean canRead() {
+        return false;
+    }
+
+    @Override
+    public int read() {
+        throw new UnsupportedOperationException("write-only");
+    }
+
+    @Override
+    public int read(byte[] buffer
+    ) {
+        throw new UnsupportedOperationException("write-only");
+    }
+
+    @Override
+    public int read(byte[] buffer, int offset, int count
+    ) {
+        throw new UnsupportedOperationException("write-only");
+    }
+
+    @Override
+    public long available() {
+        throw new UnsupportedOperationException("write-only");
+    }
+    //</editor-fold>
+
+    public interface OffsetChecker {
+
+        /**
+         * Checks the amount of available space ahead
+         *
+         * @return absolute offset in the file where no more data SHOULD NOT be
+         * written. If the value is -1 the whole file will be used
+         */
+        long check();
+    }
+
+    public interface ProgressReport {
+
+        /**
+         * Report the size of the new file
+         *
+         * @param progress the new size
+         */
+        void report(long progress);
+    }
+
+    public interface WriteErrorHandle {
+
+        /**
+         * Attempts to handle a I/O exception
+         *
+         * @param err the cause
+         * @return {@code true} to retry and continue, otherwise, {@code false}
+         * and throw the exception
+         */
+        boolean handle(Exception err);
+    }
+
+    class BufferedFile {
+
+        protected final RandomAccessFile target;
+
+        private long offset;
+        protected long length;
+
+        private byte[] queue;
+        private int queueSize;
+
+        BufferedFile(File file) throws FileNotFoundException {
+            queue = new byte[QUEUE_BUFFER_SIZE];
+            target = new RandomAccessFile(file, "rw");
+        }
+
+        protected long getOffset() {
+            return offset + queueSize;// absolute offset in the file
+        }
+
+        protected void dispose() {
+            try {
+                queue = null;
+                target.close();
+            } catch (IOException e) {
+                // nothing to do
+            }
+        }
+
+        protected void write(byte b[], int off, int len) throws IOException {
+            while (len > 0) {
+                // if the queue is full, the method available() will flush the queue
+                int read = Math.min(available(), len);
+
+                // enqueue incoming buffer
+                System.arraycopy(b, off, queue, queueSize, read);
+                queueSize += read;
+
+                len -= read;
+                off += read;
+            }
+
+            long total = offset + queueSize;
+            if (total > length) {
+                length = total;// save length
+            }
+        }
+
+        protected void flush() throws IOException {
+            writeProof(queue, queueSize);
+            offset += queueSize;
+            queueSize = 0;
+        }
+
+        protected void rewind() throws IOException {
+            offset = 0;
+            target.seek(0);
+        }
+
+        protected int available() throws IOException {
+            if (queueSize >= queue.length) {
+                flush();
+                return queue.length;
+            }
+
+            return queue.length - queueSize;
+        }
+
+        protected void reset() throws IOException {
+            offset = 0;
+            length = 0;
+            target.seek(0);
+        }
+
+        protected void seek(long absoluteOffset) throws IOException {
+            offset = absoluteOffset;
+            target.seek(absoluteOffset);
+        }
+
+        protected void writeProof(byte[] buffer, int length) throws IOException {
+            if (onWriteError == null) {
+                target.write(buffer, 0, length);
+                return;
+            }
+
+            while (true) {
+                try {
+                    target.write(buffer, 0, length);
+                    return;
+                } catch (Exception e) {
+                    if (!onWriteError.handle(e)) {
+                        throw e;// give up
+                    }
+                }
+            }
+        }
+
+        @NonNull
+        @Override
+        public String toString() {
+            String absOffset;
+            String absLength;
+
+            try {
+                absOffset = Long.toString(target.getFilePointer());
+            } catch (IOException e) {
+                absOffset = "[" + e.getLocalizedMessage() + "]";
+            }
+            try {
+                absLength = Long.toString(target.length());
+            } catch (IOException e) {
+                absLength = "[" + e.getLocalizedMessage() + "]";
+            }
+
+            return String.format(
+                    "offset=%s  length=%s queue=%s  absOffset=%s  absLength=%s",
+                    offset, length, queueSize, absOffset, absLength
+            );
+        }
+    }
+}

app/src/main/java/us/shandian/giga/postprocessing/io/FileStream.java

@@ -1,126 +0,0 @@
-package us.shandian.giga.postprocessing.io;
-
-import org.schabi.newpipe.streams.io.SharpStream;
-
-import java.io.IOException;
-import java.io.RandomAccessFile;
-import java.nio.channels.FileChannel;
-
-/**
- * @author kapodamy
- */
-public class FileStream extends SharpStream {
-
-    public enum Mode {
-        Read,
-        ReadWrite
-    }
-
-    public RandomAccessFile source;
-    private final Mode mode;
-
-    public FileStream(String path, Mode mode) throws IOException {
-        String flags;
-
-        if (mode == Mode.Read) {
-            flags = "r";
-        } else {
-            flags = "rw";
-        }
-
-        this.mode = mode;
-        source = new RandomAccessFile(path, flags);
-    }
-
-    @Override
-    public int read() throws IOException {
-        return source.read();
-    }
-
-    @Override
-    public int read(byte b[]) throws IOException {
-        return read(b, 0, b.length);
-    }
-
-    @Override
-    public int read(byte b[], int off, int len) throws IOException {
-        return source.read(b, off, len);
-    }
-
-    @Override
-    public long skip(long pos) throws IOException {
-        FileChannel fc = source.getChannel();
-        fc.position(fc.position() + pos);
-        return pos;
-    }
-
-    @Override
-    public int available() {
-        try {
-            return (int) (source.length() - source.getFilePointer());
-        } catch (IOException ex) {
-            return 0;
-        }
-    }
-
-    @SuppressWarnings("EmptyCatchBlock")
-    @Override
-    public void dispose() {
-        try {
-            source.close();
-        } catch (IOException err) {
-
-        } finally {
-            source = null;
-        }
-    }
-
-    @Override
-    public boolean isDisposed() {
-        return source == null;
-    }
-
-    @Override
-    public void rewind() throws IOException {
-        source.getChannel().position(0);
-    }
-
-    @Override
-    public boolean canRewind() {
-        return true;
-    }
-
-    @Override
-    public boolean canRead() {
-        return mode == Mode.Read || mode == Mode.ReadWrite;
-    }
-
-    @Override
-    public boolean canWrite() {
-        return mode == Mode.ReadWrite;
-    }
-
-    @Override
-    public void write(byte value) throws IOException {
-        source.write(value);
-    }
-
-    @Override
-    public void write(byte[] buffer) throws IOException {
-        source.write(buffer);
-    }
-
-    @Override
-    public void write(byte[] buffer, int offset, int count) throws IOException {
-        source.write(buffer, offset, count);
-    }
-
-    @Override
-    public void flush() {
-    }
-
-    @Override
-    public void setLength(long length) throws IOException {
-        source.setLength(length);
-    }
-}

app/src/main/java/us/shandian/giga/postprocessing/io/SharpInputStream.java

@@ -14,6 +14,7 @@ import java.io.InputStream;
 
 /**
  * Wrapper for the classic {@link java.io.InputStream}
+ *
  * @author kapodamy
  */
 public class SharpInputStream extends InputStream {
@@ -49,7 +50,8 @@ public class SharpInputStream extends InputStream {
 
     @Override
     public int available() {
-        return base.available();
+        long res = base.available();
+        return res > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) res;
     }
 
     @Override

app/src/main/java/us/shandian/giga/service/DownloadManager.java

@@ -21,6 +21,8 @@ import us.shandian.giga.get.DownloadMission;
 import us.shandian.giga.get.FinishedMission;
 import us.shandian.giga.get.Mission;
 import us.shandian.giga.get.sqlite.DownloadDataSource;
+import us.shandian.giga.service.DownloadManagerService.DMChecker;
+import us.shandian.giga.service.DownloadManagerService.MissionCheck;
 import us.shandian.giga.util.Utility;
 
 import static org.schabi.newpipe.BuildConfig.DEBUG;
@@ -28,7 +30,7 @@ import static org.schabi.newpipe.BuildConfig.DEBUG;
 public class DownloadManager {
     private static final String TAG = DownloadManager.class.getSimpleName();
 
-    enum NetworkState {Unavailable, WifiOperating, MobileOperating, OtherOperating}
+    enum NetworkState {Unavailable, Operating, MeteredOperating}
 
     public final static int SPECIAL_NOTHING = 0;
     public final static int SPECIAL_PENDING = 1;
@@ -45,7 +47,9 @@ public class DownloadManager {
     private NetworkState mLastNetworkStatus = NetworkState.Unavailable;
 
     int mPrefMaxRetry;
-    boolean mPrefCrossNetwork;
+    boolean mPrefMeteredDownloads;
+    boolean mPrefQueueLimit;
+    private boolean mSelfMissionsControl;
 
     /**
      * Create a new instance
@@ -152,8 +156,8 @@ public class DownloadManager {
                         }
 
                         mis.postprocessingState = 0;
-                        mis.errCode = DownloadMission.ERROR_POSTPROCESSING;
+                        mis.errCode = DownloadMission.ERROR_POSTPROCESSING_STOPPED;
-                        mis.errObject = new RuntimeException("stopped unexpectedly");
+                        mis.errObject = null;
                     } else if (exists && !dl.isFile()) {
                         // probably a folder, this should never happens
                         if (!sub.delete()) {
@@ -162,20 +166,21 @@ public class DownloadManager {
                         continue;
                     }
 
-                    if (!exists) {
+                    if (!exists && mis.isInitialized()) {
                         // downloaded file deleted, reset mission state
                         DownloadMission m = new DownloadMission(mis.urls, mis.name, mis.location, mis.kind, mis.postprocessingName, mis.postprocessingArgs);
                         m.timestamp = mis.timestamp;
                         m.threadCount = mis.threadCount;
                         m.source = mis.source;
-                        m.maxRetry = mis.maxRetry;
                         m.nearLength = mis.nearLength;
+                        m.setEnqueued(mis.enqueued);
                         mis = m;
                     }
 
                     mis.running = false;
                     mis.recovered = exists;
                     mis.metadata = sub;
+                    mis.maxRetry = mPrefMaxRetry;
                     mis.mHandler = mHandler;
 
                     mMissionsPending.add(mis);
@@ -205,7 +210,9 @@ public class DownloadManager {
         synchronized (this) {
             // check for existing pending download
             DownloadMission pendingMission = getPendingMission(location, name);
+
             if (pendingMission != null) {
+                if (pendingMission.running) {
                     // generate unique filename (?)
                     try {
                         name = generateUniqueName(location, name);
@@ -215,7 +222,13 @@ public class DownloadManager {
                         Log.i(TAG, "Using " + name);
                     }
                 } else {
-                // check for existing finished download
+                    // dispose the mission
+                    mMissionsPending.remove(pendingMission);
+                    mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_DELETED);
+                    pendingMission.delete();
+                }
+            } else {
+                // check for existing finished download and dispose (if exists)
                 int index = getFinishedMissionIndex(location, name);
                 if (index >= 0) mDownloadDataSource.deleteMission(mMissionsFinished.remove(index));
             }
@@ -242,14 +255,17 @@ public class DownloadManager {
                 mission.timestamp = System.currentTimeMillis();
             }
 
+            mSelfMissionsControl = true;
             mMissionsPending.add(mission);
 
-            // Before starting, save the state in case the internet connection is not available
+            // Before continue, save the metadata in case the internet connection is not available
             Utility.writeToFile(mission.metadata, mission);
 
-            if (canDownloadInCurrentNetwork() && (getRunningMissionsCount() < 1)) {
+            boolean start = !mPrefQueueLimit || getRunningMissionsCount() < 1;
+
+            if (canDownloadInCurrentNetwork() && start) {
+                mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PROGRESS);
                 mission.start();
-                mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_RUNNING);
             }
         }
     }
@@ -257,13 +273,14 @@ public class DownloadManager {
 
     public void resumeMission(DownloadMission mission) {
         if (!mission.running) {
+            mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PROGRESS);
             mission.start();
-            mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_RUNNING);
         }
     }
 
     public void pauseMission(DownloadMission mission) {
         if (mission.running) {
+            mission.setEnqueued(false);
             mission.pause();
             mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PAUSED);
         }
@@ -335,7 +352,7 @@ public class DownloadManager {
         int count = 0;
         synchronized (this) {
             for (DownloadMission mission : mMissionsPending) {
-                if (mission.running && !mission.isFinished() && !mission.isPsFailed())
+                if (mission.running && !mission.isPsFailed() && !mission.isFinished())
                     count++;
             }
         }
@@ -343,12 +360,38 @@ public class DownloadManager {
         return count;
     }
 
-    void pauseAllMissions() {
+    public void pauseAllMissions(boolean force) {
+        boolean flag = false;
+
         synchronized (this) {
-            for (DownloadMission mission : mMissionsPending) mission.pause();
+            for (DownloadMission mission : mMissionsPending) {
+                if (!mission.running || mission.isPsRunning() || mission.isFinished()) continue;
+
+                if (force) mission.threads = null;// avoid waiting for threads
+
+                mission.pause();
+                flag = true;
             }
         }
 
+        if (flag) mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PAUSED);
+    }
+
+    public void startAllMissions() {
+        boolean flag = false;
+
+        synchronized (this) {
+            for (DownloadMission mission : mMissionsPending) {
+                if (mission.running || mission.isPsFailed() || mission.isFinished()) continue;
+
+                flag = true;
+                mission.start();
+            }
+        }
+
+        if (flag) mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PROGRESS);
+    }
+
 
     /**
      * Splits the filename into name and extension
@@ -415,31 +458,35 @@ public class DownloadManager {
     }
 
     /**
-     * runs another mission in queue if possible
+     * runs one or multiple missions in from queue if possible
      *
-     * @return true if exits pending missions running or a mission was started, otherwise, false
+     * @return true if one or multiple missions are running, otherwise, false
      */
-    boolean runAnotherMission() {
+    boolean runMissions() {
         synchronized (this) {
             if (mMissionsPending.size() < 1) return false;
-
-            int i = getRunningMissionsCount();
-            if (i > 0) return true;
-
             if (!canDownloadInCurrentNetwork()) return false;
 
-            for (DownloadMission mission : mMissionsPending) {
+            if (mPrefQueueLimit) {
-                if (!mission.running && mission.errCode == DownloadMission.ERROR_NOTHING && mission.enqueued) {
+                for (DownloadMission mission : mMissionsPending)
-                    resumeMission(mission);
+                    if (!mission.isFinished() && mission.running) return true;
-                    return true;
-                }
             }
 
-            return false;
+            boolean flag = false;
+            for (DownloadMission mission : mMissionsPending) {
+                if (mission.running || !mission.enqueued || mission.isFinished()) continue;
+
+                resumeMission(mission);
+                if (mPrefQueueLimit) return true;
+                flag = true;
+            }
+
+            return flag;
         }
     }
 
     public MissionIterator getIterator() {
+        mSelfMissionsControl = true;
         return new MissionIterator();
     }
 
@@ -457,31 +504,43 @@ public class DownloadManager {
 
     private boolean canDownloadInCurrentNetwork() {
         if (mLastNetworkStatus == NetworkState.Unavailable) return false;
-        return !(mPrefCrossNetwork && mLastNetworkStatus == NetworkState.MobileOperating);
+        return !(mPrefMeteredDownloads && mLastNetworkStatus == NetworkState.MeteredOperating);
     }
 
-    void handleConnectivityChange(NetworkState currentStatus) {
+    void handleConnectivityState(NetworkState currentStatus, boolean updateOnly) {
         if (currentStatus == mLastNetworkStatus) return;
 
         mLastNetworkStatus = currentStatus;
+        if (currentStatus == NetworkState.Unavailable) return;
 
-        if (currentStatus == NetworkState.Unavailable) {
+        if (!mSelfMissionsControl || updateOnly) {
-            return;
+            return;// don't touch anything without the user interaction
-        } else if (currentStatus != NetworkState.MobileOperating || !mPrefCrossNetwork) {
-            return;
         }
 
-        boolean flag = false;
+        boolean isMetered = mPrefMeteredDownloads && mLastNetworkStatus == NetworkState.MeteredOperating;
+
+        int running = 0;
+        int paused = 0;
         synchronized (this) {
             for (DownloadMission mission : mMissionsPending) {
-                if (mission.running && !mission.isFinished() && !mission.isPsRunning()) {
+                if (mission.isFinished() || mission.isPsRunning()) continue;
-                    flag = true;
+
+                if (mission.running && isMetered) {
+                    paused++;
                     mission.pause();
+                } else if (!mission.running && !isMetered && mission.enqueued) {
+                    running++;
+                    mission.start();
+                    if (mPrefQueueLimit) break;
                 }
             }
         }
 
-        if (flag) mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PAUSED);
+        if (running > 0) {
+            mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PROGRESS);
+            return;
+        }
+        if (paused > 0) mHandler.sendEmptyMessage(DownloadManagerService.MESSAGE_PAUSED);
     }
 
     void updateMaximumAttempts() {
@@ -506,21 +565,24 @@ public class DownloadManager {
         ), Toast.LENGTH_LONG).show();
     }
 
-    void checkForRunningMission(String location, String name, DownloadManagerService.DMChecker check) {
+    void checkForRunningMission(String location, String name, DMChecker check) {
-        boolean listed;
+        MissionCheck result = MissionCheck.None;
-        boolean finished = false;
 
         synchronized (this) {
-            DownloadMission mission = getPendingMission(location, name);
+            DownloadMission pending = getPendingMission(location, name);
-            if (mission != null) {
+
-                listed = true;
+            if (pending == null) {
+                if (getFinishedMissionIndex(location, name) >= 0) result = MissionCheck.Finished;
             } else {
-                listed = getFinishedMissionIndex(location, name) >= 0;
+                if (pending.isFinished()) {
-                finished = listed;
+                    result = MissionCheck.Finished;// this never should happen (race-condition)
+                } else {
+                    result = pending.running ? MissionCheck.PendingRunning : MissionCheck.Pending;
+                }
             }
         }
 
-        check.callback(listed, finished);
+        check.callback(result);
     }
 
     public class MissionIterator extends DiffUtil.Callback {
@@ -592,39 +654,6 @@ public class DownloadManager {
             return SPECIAL_NOTHING;
         }
 
-        public MissionItem getItemUnsafe(int position) {
-            synchronized (DownloadManager.this) {
-                int count = mMissionsPending.size();
-                int count2 = mMissionsFinished.size();
-
-                if (count > 0) {
-                    position--;
-                    if (position == -1)
-                        return new MissionItem(SPECIAL_PENDING);
-                    else if (position < count)
-                        return new MissionItem(SPECIAL_NOTHING, mMissionsPending.get(position));
-                    else if (position == count && count2 > 0)
-                        return new MissionItem(SPECIAL_FINISHED);
-                    else
-                        position -= count;
-                } else {
-                    if (count2 > 0 && position == 0) {
-                        return new MissionItem(SPECIAL_FINISHED);
-                    }
-                }
-
-                position--;
-
-                if (count2 < 1) {
-                    throw new RuntimeException(
-                            String.format("Out of range. pending_count=%s  finished_count=%s  position=%s", count, count2, position)
-                    );
-                }
-
-                return new MissionItem(SPECIAL_NOTHING, mMissionsFinished.get(position));
-            }
-        }
-
 
         public void start() {
             current = getSpecialItems();
@@ -647,6 +676,32 @@ public class DownloadManager {
             return hasFinished;
         }
 
+        /**
+         * Check if exists missions running and paused. Corrupted and hidden missions are not counted
+         *
+         * @return two-dimensional array contains the current missions state.
+         * 1° entry: true if has at least one mission running
+         * 2° entry: true if has at least one mission paused
+         */
+        public boolean[] hasValidPendingMissions() {
+            boolean running = false;
+            boolean paused = false;
+
+            synchronized (DownloadManager.this) {
+                for (DownloadMission mission : mMissionsPending) {
+                    if (hidden.contains(mission) || mission.isPsFailed() || mission.isFinished())
+                        continue;
+
+                    if (mission.running)
+                        paused = true;
+                    else
+                        running = true;
+                }
+            }
+
+            return new boolean[]{running, paused};
+        }
+
 
         @Override
         public int getOldListSize() {

app/src/main/java/us/shandian/giga/service/DownloadManagerService.java

@@ -15,7 +15,9 @@ import android.content.SharedPreferences;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.net.ConnectivityManager;
+import android.net.Network;
 import android.net.NetworkInfo;
+import android.net.NetworkRequest;
 import android.net.Uri;
 import android.os.Binder;
 import android.os.Build;
@@ -24,6 +26,7 @@ import android.os.IBinder;
 import android.os.Looper;
 import android.os.Message;
 import android.preference.PreferenceManager;
+import android.support.annotation.NonNull;
 import android.support.v4.app.NotificationCompat;
 import android.support.v4.app.NotificationCompat.Builder;
 import android.support.v4.content.PermissionChecker;
@@ -48,7 +51,6 @@ public class DownloadManagerService extends Service {
 
     private static final String TAG = "DownloadManagerService";
 
-    public static final int MESSAGE_RUNNING = 0;
     public static final int MESSAGE_PAUSED = 1;
     public static final int MESSAGE_FINISHED = 2;
     public static final int MESSAGE_PROGRESS = 3;
@@ -76,7 +78,7 @@ public class DownloadManagerService extends Service {
     private Notification mNotification;
     private Handler mHandler;
     private boolean mForeground = false;
-    private NotificationManager notificationManager = null;
+    private NotificationManager mNotificationManager = null;
     private boolean mDownloadNotificationEnable = true;
 
     private int downloadDoneCount = 0;
@@ -85,7 +87,9 @@ public class DownloadManagerService extends Service {
 
     private final ArrayList<Handler> mEchoObservers = new ArrayList<>(1);
 
-    private BroadcastReceiver mNetworkStateListener;
+    private ConnectivityManager mConnectivityManager;
+    private BroadcastReceiver mNetworkStateListener = null;
+    private ConnectivityManager.NetworkCallback mNetworkStateListenerL = null;
 
     private SharedPreferences mPrefs = null;
     private final SharedPreferences.OnSharedPreferenceChangeListener mPrefChangeListener = this::handlePreferenceChange;
@@ -147,25 +151,39 @@ public class DownloadManagerService extends Service {
                 .setContentText(getString(R.string.msg_running_detail));
 
         mNotification = builder.build();
-        notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 
+        mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
+        mConnectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
+
+        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            mNetworkStateListenerL = new ConnectivityManager.NetworkCallback() {
+                @Override
+                public void onAvailable(Network network) {
+                    handleConnectivityState(false);
+                }
+
+                @Override
+                public void onLost(Network network) {
+                    handleConnectivityState(false);
+                }
+            };
+            mConnectivityManager.registerNetworkCallback(new NetworkRequest.Builder().build(), mNetworkStateListenerL);
+        } else {
             mNetworkStateListener = new BroadcastReceiver() {
                 @Override
                 public void onReceive(Context context, Intent intent) {
-                if (intent.getBooleanExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, false)) {
+                    handleConnectivityState(false);
-                    handleConnectivityChange(null);
-                    return;
-                }
-                handleConnectivityChange(intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO));
                 }
             };
             registerReceiver(mNetworkStateListener, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
+        }
 
         mPrefs = PreferenceManager.getDefaultSharedPreferences(this);
         mPrefs.registerOnSharedPreferenceChangeListener(mPrefChangeListener);
 
         handlePreferenceChange(mPrefs, getString(R.string.downloads_cross_network));
         handlePreferenceChange(mPrefs, getString(R.string.downloads_maximum_retry));
+        handlePreferenceChange(mPrefs, getString(R.string.downloads_queue_limit));
 
         mLock = new LockManager(this);
     }
@@ -173,12 +191,11 @@ public class DownloadManagerService extends Service {
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
         if (DEBUG) {
-            if (intent == null) {
+            Log.d(TAG, intent == null ? "Restarting" : "Starting");
-                Log.d(TAG, "Restarting");
-                return START_NOT_STICKY;
-            }
-            Log.d(TAG, "Starting");
         }
+
+        if (intent == null) return START_NOT_STICKY;
+
         Log.i(TAG, "Got intent: " + intent);
         String action = intent.getAction();
         if (action != null) {
@@ -193,6 +210,8 @@ public class DownloadManagerService extends Service {
                 String source = intent.getStringExtra(EXTRA_SOURCE);
                 long nearLength = intent.getLongExtra(EXTRA_NEAR_LENGTH, 0);
 
+                handleConnectivityState(true);// first check the actual network status
+
                 mHandler.post(() -> mManager.startMission(urls, location, name, kind, threads, source, psName, psArgs, nearLength));
 
             } else if (downloadDoneNotification != null) {
@@ -221,21 +240,25 @@ public class DownloadManagerService extends Service {
 
         stopForeground(true);
 
-        if (notificationManager != null && downloadDoneNotification != null) {
+        if (mNotificationManager != null && downloadDoneNotification != null) {
             downloadDoneNotification.setDeleteIntent(null);// prevent NewPipe running when is killed, cleared from recent, etc
-            notificationManager.notify(DOWNLOADS_NOTIFICATION_ID, downloadDoneNotification.build());
+            mNotificationManager.notify(DOWNLOADS_NOTIFICATION_ID, downloadDoneNotification.build());
         }
 
-        mManager.pauseAllMissions();
-
         manageLock(false);
 
+        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
+            mConnectivityManager.unregisterNetworkCallback(mNetworkStateListenerL);
+        else
             unregisterReceiver(mNetworkStateListener);
+
         mPrefs.unregisterOnSharedPreferenceChangeListener(mPrefChangeListener);
 
         if (icDownloadDone != null) icDownloadDone.recycle();
         if (icDownloadFailed != null) icDownloadFailed.recycle();
         if (icLauncher != null) icLauncher.recycle();
+
+        mManager.pauseAllMissions(true);
     }
 
     @Override
@@ -264,15 +287,16 @@ public class DownloadManagerService extends Service {
                 notifyMediaScanner(mission.getDownloadedFile());
                 notifyFinishedDownload(mission.name);
                 mManager.setFinished(mission);
-                updateForegroundState(mManager.runAnotherMission());
+                handleConnectivityState(false);
+                updateForegroundState(mManager.runMissions());
                 break;
-            case MESSAGE_RUNNING:
             case MESSAGE_PROGRESS:
                 updateForegroundState(true);
                 break;
             case MESSAGE_ERROR:
                 notifyFailedDownload(mission);
-                updateForegroundState(mManager.runAnotherMission());
+                handleConnectivityState(false);
+                updateForegroundState(mManager.runMissions());
                 break;
             case MESSAGE_PAUSED:
                 updateForegroundState(mManager.getRunningMissionsCount() > 0);
@@ -293,36 +317,30 @@ public class DownloadManagerService extends Service {
         }
     }
 
-    private void handleConnectivityChange(NetworkInfo info) {
+    private void handleConnectivityState(boolean updateOnly) {
+        NetworkInfo info = mConnectivityManager.getActiveNetworkInfo();
         NetworkState status;
 
         if (info == null) {
             status = NetworkState.Unavailable;
-            Log.i(TAG, "actual connectivity status is unavailable");
+            Log.i(TAG, "Active network [connectivity is unavailable]");
-        } else if (!info.isAvailable() || !info.isConnected()) {
-            status = NetworkState.Unavailable;
-            Log.i(TAG, "actual connectivity status is not available and not connected");
-        } else {
-            int type = info.getType();
-            if (type == ConnectivityManager.TYPE_MOBILE || type == ConnectivityManager.TYPE_MOBILE_DUN) {
-                status = NetworkState.MobileOperating;
-            } else if (type == ConnectivityManager.TYPE_WIFI) {
-                status = NetworkState.WifiOperating;
-            } else if (type == ConnectivityManager.TYPE_WIMAX ||
-                    type == ConnectivityManager.TYPE_ETHERNET ||
-                    type == ConnectivityManager.TYPE_BLUETOOTH) {
-                status = NetworkState.OtherOperating;
         } else {
+            boolean connected = info.isConnected();
+            boolean metered = mConnectivityManager.isActiveNetworkMetered();
+
+            if (connected)
+                status = metered ? NetworkState.MeteredOperating : NetworkState.Operating;
+            else
                 status = NetworkState.Unavailable;
-            }
+
-            Log.i(TAG, "actual connectivity status is " + status.name());
+            Log.i(TAG, "Active network [connected=" + connected + " metered=" + metered + "] " + info.toString());
         }
 
         if (mManager == null) return;// avoid race-conditions while the service is starting
-        mManager.handleConnectivityChange(status);
+        mManager.handleConnectivityState(status, updateOnly);
     }
 
-    private void handlePreferenceChange(SharedPreferences prefs, String key) {
+    private void handlePreferenceChange(SharedPreferences prefs, @NonNull String key) {
         if (key.equals(getString(R.string.downloads_maximum_retry))) {
             try {
                 String value = prefs.getString(key, getString(R.string.downloads_maximum_retry_default));
@@ -332,7 +350,9 @@ public class DownloadManagerService extends Service {
             }
             mManager.updateMaximumAttempts();
         } else if (key.equals(getString(R.string.downloads_cross_network))) {
-            mManager.mPrefCrossNetwork = prefs.getBoolean(key, false);
+            mManager.mPrefMeteredDownloads = prefs.getBoolean(key, false);
+        } else if (key.equals(getString(R.string.downloads_queue_limit))) {
+            mManager.mPrefQueueLimit = prefs.getBoolean(key, true);
         }
     }
 
@@ -366,19 +386,20 @@ public class DownloadManagerService extends Service {
         context.startService(intent);
     }
 
-    public static void checkForRunningMission(Context context, String location, String name, DMChecker check) {
+    public static void checkForRunningMission(Context context, String location, String name, DMChecker checker) {
         Intent intent = new Intent();
         intent.setClass(context, DownloadManagerService.class);
+        context.startService(intent);
+
         context.bindService(intent, new ServiceConnection() {
             @Override
             public void onServiceConnected(ComponentName cname, IBinder service) {
                 try {
-                    ((DMBinder) service).getDownloadManager().checkForRunningMission(location, name, check);
+                    ((DMBinder) service).getDownloadManager().checkForRunningMission(location, name, checker);
                 } catch (Exception err) {
                     Log.w(TAG, "checkForRunningMission() callback is defective", err);
                 }
 
-                // TODO: find a efficient way to unbind the service. This destroy the service due idle, but is started again when the user start a download.
                 context.unbindService(this);
             }
 
@@ -389,7 +410,7 @@ public class DownloadManagerService extends Service {
     }
 
     public void notifyFinishedDownload(String name) {
-        if (!mDownloadNotificationEnable || notificationManager == null) {
+        if (!mDownloadNotificationEnable || mNotificationManager == null) {
             return;
         }
 
@@ -428,7 +449,7 @@ public class DownloadManagerService extends Service {
             downloadDoneNotification.setContentText(downloadDoneList);
         }
 
-        notificationManager.notify(DOWNLOADS_NOTIFICATION_ID, downloadDoneNotification.build());
+        mNotificationManager.notify(DOWNLOADS_NOTIFICATION_ID, downloadDoneNotification.build());
         downloadDoneCount++;
     }
 
@@ -458,7 +479,7 @@ public class DownloadManagerService extends Service {
                     .bigText(mission.name));
         }
 
-        notificationManager.notify(id, downloadFailedNotification.build());
+        mNotificationManager.notify(id, downloadFailedNotification.build());
     }
 
     private PendingIntent makePendingIntent(String action) {
@@ -487,7 +508,11 @@ public class DownloadManagerService extends Service {
         mLockAcquired = acquire;
     }
 
-    // Wrapper of DownloadManager
+
+    ////////////////////////////////////////////////////////////////////////////////////////////////
+    // Wrappers for DownloadManager
+    ////////////////////////////////////////////////////////////////////////////////////////////////
+
     public class DMBinder extends Binder {
         public DownloadManager getDownloadManager() {
             return mManager;
@@ -502,15 +527,15 @@ public class DownloadManagerService extends Service {
         }
 
         public void clearDownloadNotifications() {
-            if (notificationManager == null) return;
+            if (mNotificationManager == null) return;
             if (downloadDoneNotification != null) {
-                notificationManager.cancel(DOWNLOADS_NOTIFICATION_ID);
+                mNotificationManager.cancel(DOWNLOADS_NOTIFICATION_ID);
                 downloadDoneList.setLength(0);
                 downloadDoneCount = 0;
             }
             if (downloadFailedNotification != null) {
                 for (; downloadFailedNotificationID > DOWNLOADS_NOTIFICATION_ID; downloadFailedNotificationID--) {
-                    notificationManager.cancel(downloadFailedNotificationID);
+                    mNotificationManager.cancel(downloadFailedNotificationID);
                 }
                 mFailedDownloads.clear();
                 downloadFailedNotificationID++;
@@ -524,7 +549,9 @@ public class DownloadManagerService extends Service {
     }
 
     public interface DMChecker {
-        void callback(boolean listed, boolean finished);
+        void callback(MissionCheck result);
     }
 
+    public enum MissionCheck {None, Pending, PendingRunning, Finished}
+
 }

app/src/main/java/us/shandian/giga/ui/adapter/MissionAdapter.java

@@ -14,15 +14,17 @@ import android.os.Looper;
 import android.os.Message;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
+import android.support.annotation.StringRes;
 import android.support.v4.content.FileProvider;
 import android.support.v4.view.ViewCompat;
 import android.support.v7.app.AlertDialog;
 import android.support.v7.util.DiffUtil;
 import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.RecyclerView.ViewHolder;
 import android.support.v7.widget.RecyclerView.Adapter;
+import android.support.v7.widget.RecyclerView.ViewHolder;
 import android.util.Log;
 import android.util.SparseArray;
+import android.view.HapticFeedbackConstants;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -36,14 +38,17 @@ import android.widget.Toast;
 
 import org.schabi.newpipe.BuildConfig;
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.report.ErrorActivity;
+import org.schabi.newpipe.report.UserAction;
 import org.schabi.newpipe.util.NavigationHelper;
 
-import java.io.File;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
+import java.util.Collections;
 
 import us.shandian.giga.get.DownloadMission;
 import us.shandian.giga.get.FinishedMission;
+import us.shandian.giga.get.Mission;
 import us.shandian.giga.service.DownloadManager;
 import us.shandian.giga.service.DownloadManagerService;
 import us.shandian.giga.ui.common.Deleter;
@@ -57,10 +62,13 @@ import static us.shandian.giga.get.DownloadMission.ERROR_CONNECT_HOST;
 import static us.shandian.giga.get.DownloadMission.ERROR_FILE_CREATION;
 import static us.shandian.giga.get.DownloadMission.ERROR_HTTP_NO_CONTENT;
 import static us.shandian.giga.get.DownloadMission.ERROR_HTTP_UNSUPPORTED_RANGE;
+import static us.shandian.giga.get.DownloadMission.ERROR_INSUFFICIENT_STORAGE;
 import static us.shandian.giga.get.DownloadMission.ERROR_NOTHING;
 import static us.shandian.giga.get.DownloadMission.ERROR_PATH_CREATION;
 import static us.shandian.giga.get.DownloadMission.ERROR_PERMISSION_DENIED;
 import static us.shandian.giga.get.DownloadMission.ERROR_POSTPROCESSING;
+import static us.shandian.giga.get.DownloadMission.ERROR_POSTPROCESSING_HOLD;
+import static us.shandian.giga.get.DownloadMission.ERROR_POSTPROCESSING_STOPPED;
 import static us.shandian.giga.get.DownloadMission.ERROR_SSL_EXCEPTION;
 import static us.shandian.giga.get.DownloadMission.ERROR_UNKNOWN_EXCEPTION;
 import static us.shandian.giga.get.DownloadMission.ERROR_UNKNOWN_HOST;
@@ -69,6 +77,7 @@ public class MissionAdapter extends Adapter<ViewHolder> {
     private static final SparseArray<String> ALGORITHMS = new SparseArray<>();
     private static final String TAG = "MissionAdapter";
     private static final String UNDEFINED_PROGRESS = "--.-%";
+    private static final String DEFAULT_MIME_TYPE = "*/*";
 
 
     static {
@@ -85,9 +94,11 @@ public class MissionAdapter extends Adapter<ViewHolder> {
     private ArrayList<ViewHolderItem> mPendingDownloadsItems = new ArrayList<>();
     private Handler mHandler;
     private MenuItem mClear;
+    private MenuItem mStartButton;
+    private MenuItem mPauseButton;
     private View mEmptyMessage;
 
-    public MissionAdapter(Context context, DownloadManager downloadManager, MenuItem clearButton, View emptyMessage) {
+    public MissionAdapter(Context context, DownloadManager downloadManager, View emptyMessage) {
         mContext = context;
         mDownloadManager = downloadManager;
         mDeleter = null;
@@ -105,10 +116,18 @@ public class MissionAdapter extends Adapter<ViewHolder> {
                         onServiceMessage(msg);
                         break;
                 }
+
+                if (mStartButton != null && mPauseButton != null) switch (msg.what) {
+                    case DownloadManagerService.MESSAGE_DELETED:
+                    case DownloadManagerService.MESSAGE_ERROR:
+                    case DownloadManagerService.MESSAGE_FINISHED:
+                    case DownloadManagerService.MESSAGE_PAUSED:
+                        checkMasterButtonsVisibility();
+                        break;
+                }
             }
         };
 
-        mClear = clearButton;
         mEmptyMessage = emptyMessage;
 
         mIterator = downloadManager.getIterator();
@@ -225,8 +244,10 @@ public class MissionAdapter extends Adapter<ViewHolder> {
         long deltaDone = mission.done - h.lastDone;
         boolean hasError = mission.errCode != ERROR_NOTHING;
 
-        // on error hide marquee or show if condition (mission.done < 1 || mission.unknownLength) is true
+        // hide on error
-        h.progress.setMarquee(!hasError && (mission.done < 1 || mission.unknownLength));
+        // show if current resource length is not fetched
+        // show if length is unknown
+        h.progress.setMarquee(!hasError && (!mission.isInitialized() || mission.unknownLength));
 
         float progress;
         if (mission.unknownLength) {
@@ -305,36 +326,64 @@ public class MissionAdapter extends Adapter<ViewHolder> {
         }
     }
 
-    private boolean viewWithFileProvider(@NonNull File file) {
+    private void viewWithFileProvider(Mission mission) {
-        if (!file.exists()) return true;
+        if (checkInvalidFile(mission)) return;
 
-        String ext = Utility.getFileExt(file.getName());
+        String mimeType = resolveMimeType(mission);
-        if (ext == null) return false;
 
-        String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(ext.substring(1));
+        if (BuildConfig.DEBUG)
             Log.v(TAG, "Mime: " + mimeType + " package: " + BuildConfig.APPLICATION_ID + ".provider");
 
-        Uri uri = FileProvider.getUriForFile(mContext, BuildConfig.APPLICATION_ID + ".provider", file);
+        Uri uri = FileProvider.getUriForFile(
+                mContext,
+                BuildConfig.APPLICATION_ID + ".provider",
+                mission.getDownloadedFile()
+        );
 
         Intent intent = new Intent();
         intent.setAction(Intent.ACTION_VIEW);
         intent.setDataAndType(uri, mimeType);
         intent.addFlags(FLAG_GRANT_READ_URI_PERMISSION);
+
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
             intent.addFlags(FLAG_GRANT_PREFIX_URI_PERMISSION);
         }
-        if(Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) {
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M) {
             intent.addFlags(FLAG_ACTIVITY_NEW_TASK);
         }
+
         //mContext.grantUriPermission(packageName, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION);
-        Log.v(TAG, "Starting intent: " + intent);
+
         if (intent.resolveActivity(mContext.getPackageManager()) != null) {
             mContext.startActivity(intent);
         } else {
-            Toast noPlayerToast = Toast.makeText(mContext, R.string.toast_no_player, Toast.LENGTH_LONG);
+            Toast.makeText(mContext, R.string.toast_no_player, Toast.LENGTH_LONG).show();
-            noPlayerToast.show();
+        }
     }
 
+    private void shareFile(Mission mission) {
+        if (checkInvalidFile(mission)) return;
+
+        Intent intent = new Intent(Intent.ACTION_SEND);
+        intent.setType(resolveMimeType(mission));
+        intent.putExtra(Intent.EXTRA_STREAM, mission.getDownloadedFile().toURI());
+
+        mContext.startActivity(Intent.createChooser(intent, null));
+    }
+
+    private static String resolveMimeType(@NonNull Mission mission) {
+        String ext = Utility.getFileExt(mission.getDownloadedFile().getName());
+        if (ext == null) return DEFAULT_MIME_TYPE;
+
+        String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(ext.substring(1));
+
+        return mimeType == null ? DEFAULT_MIME_TYPE : mimeType;
+    }
+
+    private boolean checkInvalidFile(@NonNull Mission mission) {
+        if (mission.getDownloadedFile().exists()) return false;
+
+        Toast.makeText(mContext, R.string.missing_file, Toast.LENGTH_SHORT).show();
         return true;
     }
 
@@ -343,15 +392,9 @@ public class MissionAdapter extends Adapter<ViewHolder> {
     }
 
     private void onServiceMessage(@NonNull Message msg) {
-        switch (msg.what) {
+        if (msg.what == DownloadManagerService.MESSAGE_PROGRESS) {
-            case DownloadManagerService.MESSAGE_PROGRESS:
             setAutoRefresh(true);
             return;
-            case DownloadManagerService.MESSAGE_ERROR:
-            case DownloadManagerService.MESSAGE_FINISHED:
-                break;
-            default:
-                return;
         }
 
         for (int i = 0; i < mPendingDownloadsItems.size(); i++) {
@@ -370,74 +413,98 @@ public class MissionAdapter extends Adapter<ViewHolder> {
     }
 
     private void showError(@NonNull DownloadMission mission) {
-        StringBuilder str = new StringBuilder();
+        @StringRes int msg = R.string.general_error;
-        str.append(mContext.getString(R.string.label_code));
+        String msgEx = null;
-        str.append(": ");
-        str.append(mission.errCode);
-        str.append('\n');
 
         switch (mission.errCode) {
             case 416:
-                str.append(mContext.getString(R.string.error_http_requested_range_not_satisfiable));
+                msg = R.string.error_http_requested_range_not_satisfiable;
                 break;
             case 404:
-                str.append(mContext.getString(R.string.error_http_not_found));
+                msg = R.string.error_http_not_found;
                 break;
             case ERROR_NOTHING:
-                str.append("¿?");
+                return;// this never should happen
-                break;
             case ERROR_FILE_CREATION:
-                str.append(mContext.getString(R.string.error_file_creation));
+                msg = R.string.error_file_creation;
                 break;
             case ERROR_HTTP_NO_CONTENT:
-                str.append(mContext.getString(R.string.error_http_no_content));
+                msg = R.string.error_http_no_content;
                 break;
             case ERROR_HTTP_UNSUPPORTED_RANGE:
-                str.append(mContext.getString(R.string.error_http_unsupported_range));
+                msg = R.string.error_http_unsupported_range;
                 break;
             case ERROR_PATH_CREATION:
-                str.append(mContext.getString(R.string.error_path_creation));
+                msg = R.string.error_path_creation;
                 break;
             case ERROR_PERMISSION_DENIED:
-                str.append(mContext.getString(R.string.permission_denied));
+                msg = R.string.permission_denied;
                 break;
             case ERROR_SSL_EXCEPTION:
-                str.append(mContext.getString(R.string.error_ssl_exception));
+                msg = R.string.error_ssl_exception;
                 break;
             case ERROR_UNKNOWN_HOST:
-                str.append(mContext.getString(R.string.error_unknown_host));
+                msg = R.string.error_unknown_host;
                 break;
             case ERROR_CONNECT_HOST:
-                str.append(mContext.getString(R.string.error_connect_host));
+                msg = R.string.error_connect_host;
+                break;
+            case ERROR_POSTPROCESSING_STOPPED:
+                msg = R.string.error_postprocessing_stopped;
                 break;
             case ERROR_POSTPROCESSING:
-                str.append(mContext.getString(R.string.error_postprocessing_failed));
+            case ERROR_POSTPROCESSING_HOLD:
-            case ERROR_UNKNOWN_EXCEPTION:
+                showError(mission.errObject, UserAction.DOWNLOAD_POSTPROCESSING, R.string.error_postprocessing_failed);
+                return;
+            case ERROR_INSUFFICIENT_STORAGE:
+                msg = R.string.error_insufficient_storage;
                 break;
+            case ERROR_UNKNOWN_EXCEPTION:
+                showError(mission.errObject, UserAction.DOWNLOAD_FAILED, R.string.general_error);
+                return;
             default:
                 if (mission.errCode >= 100 && mission.errCode < 600) {
-                    str = new StringBuilder(8);
+                    msgEx = "HTTP " + mission.errCode;
-                    str.append("HTTP ");
-                    str.append(mission.errCode);
                 } else if (mission.errObject == null) {
-                    str.append("(not_decelerated_error_code)");
+                    msgEx = "(not_decelerated_error_code)";
+                } else {
+                    showError(mission.errObject, UserAction.DOWNLOAD_FAILED, msg);
+                    return;
                 }
                 break;
         }
 
-        if (mission.errObject != null) {
-            str.append("\n\n");
-            str.append(mission.errObject.toString());
-        }
-
         AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
-        builder.setTitle(mission.name)
+
-                .setMessage(str)
+        if (msgEx != null)
-                .setNegativeButton(android.R.string.ok, (dialog, which) -> dialog.cancel())
+            builder.setMessage(msgEx);
+        else
+            builder.setMessage(msg);
+
+        // add report button for non-HTTP errors (range 100-599)
+        if (mission.errObject != null && (mission.errCode < 100 || mission.errCode >= 600)) {
+            @StringRes final int mMsg = msg;
+            builder.setPositiveButton(R.string.error_report_title, (dialog, which) ->
+                    showError(mission.errObject, UserAction.DOWNLOAD_FAILED, mMsg)
+            );
+        }
+
+        builder.setNegativeButton(android.R.string.ok, (dialog, which) -> dialog.cancel())
+                .setTitle(mission.name)
                 .create()
                 .show();
     }
 
+    private void showError(Exception exception, UserAction action, @StringRes int reason) {
+        ErrorActivity.reportError(
+                mContext,
+                Collections.singletonList(exception),
+                null,
+                null,
+                ErrorActivity.ErrorInfo.make(action, "-", "-", reason)
+        );
+    }
+
     public void clearFinishedDownloads() {
         mDownloadManager.forgetFinishedDownloads();
         applyChanges();
@@ -466,16 +533,24 @@ public class MissionAdapter extends Adapter<ViewHolder> {
                     showError(mission);
                     return true;
                 case R.id.queue:
-                    h.queue.setChecked(!h.queue.isChecked());
+                    boolean flag = !h.queue.isChecked();
-                    mission.enqueued = h.queue.isChecked();
+                    h.queue.setChecked(flag);
+                    mission.setEnqueued(flag);
                     updateProgress(h);
                     return true;
+                case R.id.retry:
+                    mission.psContinue(true);
+                    return true;
+                case R.id.cancel:
+                    mission.psContinue(false);
+                    return false;
             }
         }
 
         switch (id) {
-            case R.id.open:
+            case R.id.menu_item_share:
-                return viewWithFileProvider(h.item.mission.getDownloadedFile());
+                shareFile(h.item.mission);
+                return true;
             case R.id.delete:
                 if (mDeleter == null) {
                     mDownloadManager.deleteMission(h.item.mission);
@@ -529,15 +604,42 @@ public class MissionAdapter extends Adapter<ViewHolder> {
     }
 
     public void setClearButton(MenuItem clearButton) {
-        if (mClear == null) clearButton.setVisible(mIterator.hasFinishedMissions());
+        if (mClear == null)
+            clearButton.setVisible(mIterator.hasFinishedMissions());
+
         mClear = clearButton;
     }
 
+    public void setMasterButtons(MenuItem startButton, MenuItem pauseButton) {
+        boolean init = mStartButton == null || mPauseButton == null;
+
+        mStartButton = startButton;
+        mPauseButton = pauseButton;
+
+        if (init) checkMasterButtonsVisibility();
+    }
+
     private void checkEmptyMessageVisibility() {
         int flag = mIterator.getOldListSize() > 0 ? View.GONE : View.VISIBLE;
         if (mEmptyMessage.getVisibility() != flag) mEmptyMessage.setVisibility(flag);
     }
 
+    private void checkMasterButtonsVisibility() {
+        boolean[] state = mIterator.hasValidPendingMissions();
+
+        mStartButton.setVisible(state[0]);
+        mPauseButton.setVisible(state[1]);
+    }
+
+    public void ensurePausedMissions() {
+        for (ViewHolderItem h : mPendingDownloadsItems) {
+            if (((DownloadMission) h.item.mission).running) continue;
+            updateProgress(h);
+            h.lastTimeStamp = -1;
+            h.lastDone = -1;
+        }
+    }
+
 
     public void deleterDispose(Bundle bundle) {
         if (mDeleter != null) mDeleter.dispose(bundle);
@@ -604,6 +706,8 @@ public class MissionAdapter extends Adapter<ViewHolder> {
         ProgressDrawable progress;
 
         PopupMenu popupMenu;
+        MenuItem retry;
+        MenuItem cancel;
         MenuItem start;
         MenuItem pause;
         MenuItem open;
@@ -636,22 +740,34 @@ public class MissionAdapter extends Adapter<ViewHolder> {
             button.setOnClickListener(v -> showPopupMenu());
 
             Menu menu = popupMenu.getMenu();
+            retry = menu.findItem(R.id.retry);
+            cancel = menu.findItem(R.id.cancel);
             start = menu.findItem(R.id.start);
             pause = menu.findItem(R.id.pause);
-            open = menu.findItem(R.id.open);
+            open = menu.findItem(R.id.menu_item_share);
             queue = menu.findItem(R.id.queue);
             showError = menu.findItem(R.id.error_message_view);
             delete = menu.findItem(R.id.delete);
             source = menu.findItem(R.id.source);
             checksum = menu.findItem(R.id.checksum);
 
-            itemView.setOnClickListener((v) -> {
+            itemView.setHapticFeedbackEnabled(true);
+
+            itemView.setOnClickListener(v -> {
                 if (item.mission instanceof FinishedMission)
-                    viewWithFileProvider(item.mission.getDownloadedFile());
+                    viewWithFileProvider(item.mission);
+            });
+
+            itemView.setOnLongClickListener(v -> {
+                v.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
+                showPopupMenu();
+                return true;
             });
         }
 
         private void showPopupMenu() {
+            retry.setVisible(false);
+            cancel.setVisible(false);
             start.setVisible(false);
             pause.setVisible(false);
             open.setVisible(false);
@@ -664,7 +780,16 @@ public class MissionAdapter extends Adapter<ViewHolder> {
             DownloadMission mission = item.mission instanceof DownloadMission ? (DownloadMission) item.mission : null;
 
             if (mission != null) {
-                if (!mission.isPsRunning()) {
+                if (mission.isPsRunning()) {
+                    switch (mission.errCode) {
+                        case ERROR_INSUFFICIENT_STORAGE:
+                        case ERROR_POSTPROCESSING_HOLD:
+                            retry.setVisible(true);
+                            cancel.setVisible(true);
+                            showError.setVisible(true);
+                            break;
+                    }
+                } else {
                     if (mission.running) {
                         pause.setVisible(true);
                     } else {

app/src/main/java/us/shandian/giga/ui/fragment/MissionsFragment.java

@@ -35,6 +35,8 @@ public class MissionsFragment extends Fragment {
     private boolean mLinear;
     private MenuItem mSwitch;
     private MenuItem mClear = null;
+    private MenuItem mStart = null;
+    private MenuItem mPause = null;
 
     private RecyclerView mList;
     private View mEmpty;
@@ -54,9 +56,11 @@ public class MissionsFragment extends Fragment {
             mBinder = (DownloadManagerService.DMBinder) binder;
             mBinder.clearDownloadNotifications();
 
-            mAdapter = new MissionAdapter(mContext, mBinder.getDownloadManager(), mClear, mEmpty);
+            mAdapter = new MissionAdapter(mContext, mBinder.getDownloadManager(), mEmpty);
             mAdapter.deleterLoad(mBundle, getView());
 
+            setAdapterButtons();
+
             mBundle = null;
 
             mBinder.addMissionEventListener(mAdapter.getMessenger());
@@ -132,7 +136,7 @@ public class MissionsFragment extends Fragment {
     public void onAttach(Activity activity) {
         super.onAttach(activity);
 
-        mContext = activity.getApplicationContext();
+        mContext = activity;
     }
 
 
@@ -154,7 +158,11 @@ public class MissionsFragment extends Fragment {
     public void onPrepareOptionsMenu(Menu menu) {
         mSwitch = menu.findItem(R.id.switch_mode);
         mClear = menu.findItem(R.id.clear_list);
-        if (mAdapter != null) mAdapter.setClearButton(mClear);
+        mStart = menu.findItem(R.id.start_downloads);
+        mPause = menu.findItem(R.id.pause_downloads);
+
+        if (mAdapter != null) setAdapterButtons();
+
         super.onPrepareOptionsMenu(menu);
     }
 
@@ -168,6 +176,14 @@ public class MissionsFragment extends Fragment {
             case R.id.clear_list:
                 mAdapter.clearFinishedDownloads();
                 return true;
+            case R.id.start_downloads:
+                item.setVisible(false);
+                mBinder.getDownloadManager().startAllMissions();
+                return true;
+            case R.id.pause_downloads:
+                item.setVisible(false);
+                mBinder.getDownloadManager().pauseAllMissions(false);
+                mAdapter.ensurePausedMissions();// update items view
             default:
                 return super.onOptionsItemSelected(item);
         }
@@ -193,9 +209,9 @@ public class MissionsFragment extends Fragment {
             int icon;
 
             if (mLinear)
-                icon = isLight ? R.drawable.ic_list_black_24dp : R.drawable.ic_list_white_24dp;
-            else
                 icon = isLight ? R.drawable.ic_grid_black_24dp : R.drawable.ic_grid_white_24dp;
+            else
+                icon = isLight ? R.drawable.ic_list_black_24dp : R.drawable.ic_list_white_24dp;
 
             mSwitch.setIcon(icon);
             mSwitch.setTitle(mLinear ? R.string.grid : R.string.list);
@@ -203,6 +219,13 @@ public class MissionsFragment extends Fragment {
         }
     }
 
+    private void setAdapterButtons() {
+        if (mClear == null || mStart == null || mPause == null) return;
+
+        mAdapter.setClearButton(mClear);
+        mAdapter.setMasterButtons(mStart, mPause);
+    }
+
     @Override
     public void onSaveInstanceState(Bundle outState) {
         super.onSaveInstanceState(outState);

app/src/main/res/menu/download_menu.xml

@@ -7,6 +7,18 @@
         android:title="@string/grid"
         app:showAsAction="ifRoom" />
 
+    <item android:id="@+id/start_downloads"
+        android:visible="false"
+        android:icon="?attr/play"
+        android:title="@string/start_downloads"
+        app:showAsAction="ifRoom" />
+
+    <item android:id="@+id/pause_downloads"
+        android:visible="false"
+        android:icon="?attr/pause"
+        android:title="@string/pause_downloads"
+        app:showAsAction="ifRoom" />
+
     <item android:id="@+id/clear_list"
         android:visible="false"
         android:icon="?attr/ic_delete"

app/src/main/res/menu/mission.xml

@@ -1,4 +1,13 @@
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item
+        android:id="@+id/retry"
+        android:title="@string/retry" />
+
+    <item
+        android:id="@+id/cancel"
+        android:title="@string/cancel" />
+
     <item
         android:id="@+id/start"
         android:title="@string/start" />
@@ -13,8 +22,8 @@
         android:checkable="true"/>
 
     <item
-        android:id="@+id/open"
+        android:id="@+id/menu_item_share"
-        android:title="@string/view" />
+        android:title="@string/share" />
 
     <item
         android:id="@+id/delete"

app/src/main/res/values-cmn/strings.xml

@@ -434,7 +434,7 @@
     <string name="permission_denied">系统拒绝该行动</string>
     <string name="download_failed">下载失败</string>
     <string name="download_finished">下载完成</string>
-    <string name="download_finished_more">%已下载完毕</string>
+    <string name="download_finished_more">%s已下载完毕</string>
     <string name="generate_unique_name">生成独特的名字</string>
     <string name="overwrite">覆写</string>
     <string name="overwrite_warning">同名的已下载文件已经存在</string>

app/src/main/res/values-es/strings.xml

@@ -159,7 +159,7 @@ abrir en modo popup</string>
     <string name="contribution_encouragement">Si tienes ideas de; traducción, cambios de diseño, limpieza de código o cambios de código realmente fuertes—la ayuda siempre es bienvenida. Cuanto más se hace, mejor se pone!</string>
     <string name="read_full_license">Leer licencia</string>
     <string name="contribution_title">Contribuir</string>
-    <string name="subscribe_button_title">Suscribirse</string>
+<string name="subscribe_button_title">Suscribirse</string>
     <string name="subscribed_button_title">Suscrito</string>
     <string name="channel_unsubscribed">Canal no suscrito</string>
     <string name="subscription_change_failed">No se pudo cambiar la suscripción</string>
@@ -211,8 +211,8 @@ abrir en modo popup</string>
         <item quantity="other">Vídeos</item>
     </plurals>
     <string name="item_deleted">Elemento eliminado</string>
-    <string name="delete_item_search_history">¿Desea eliminar este elemento del historial de búsqueda?</string>
+<string name="delete_item_search_history">¿Desea eliminar este elemento del historial de búsqueda?</string>
-    <string name="main_page_content">Contenido de la página principal</string>
+<string name="main_page_content">Contenido de la página principal</string>
     <string name="blank_page_summary">Página en blanco</string>
     <string name="kiosk_page_summary">Página del kiosco</string>
     <string name="subscription_page_summary">Página de suscripción</string>
@@ -224,7 +224,7 @@ abrir en modo popup</string>
     <string name="kiosk">Kiosco</string>
     <string name="trending">Tendencias</string>
     <string name="top_50">Top 50</string>
-    <string name="show_hold_to_append_summary">Mostrar sugerencia cuando se presiona el botón de segundo plano o popup en la página de detalles del vídeo</string>
+<string name="show_hold_to_append_summary">Mostrar sugerencia cuando se presiona el botón de segundo plano o popup en la página de detalles del vídeo</string>
     <string name="background_player_append">En cola en el reproductor de fondo</string>
     <string name="popup_playing_append">En cola en el reproductor popup</string>
     <string name="play_all">Reproducir todo</string>
@@ -242,7 +242,7 @@ abrir en modo popup</string>
     <string name="start_here_on_main">Comenzar a reproducir aquí</string>
     <string name="start_here_on_background">Comenzar aquí en segundo plano</string>
     <string name="start_here_on_popup">Comenzar aquí en popup</string>
-    <string name="show_hold_to_append_title">Mostrar consejo \"Mantener para poner en la cola\"</string>
+<string name="show_hold_to_append_title">Mostrar consejo \"Mantener para poner en la cola\"</string>
     <string name="new_and_hot">Nuevo y popular</string>
     <string name="hold_to_append">Mantener para poner en la cola</string>
     <string name="donation_title">Donar</string>
@@ -270,7 +270,7 @@ abrir en modo popup</string>
     <string name="popup_player">Reproductor de popup</string>
     <string name="preferred_player_fetcher_notification_title">Obteniendo información…</string>
     <string name="preferred_player_fetcher_notification_message">Cargando contenido solicitado</string>
-    <string name="import_data_title">Importar base de datos</string>
+<string name="import_data_title">Importar base de datos</string>
     <string name="export_data_title">Exportar base de datos</string>
     <string name="import_data_summary">Reemplazará su historial actual y sus suscripciones</string>
     <string name="export_data_summary">Exportar historial, suscripciones y listas de reproducción</string>
@@ -325,6 +325,7 @@ abrir en modo popup</string>
     <string name="live">DIRECTO</string>
     <string name="live_sync">SINCRONIZAR</string>
     <string name="file">Archivo</string>
+    <string name="missing_file">Archivo movido o eliminado</string>
     <string name="invalid_directory">No existe el directorio</string>
     <string name="invalid_source">No existe la fuente del archivo/contenido</string>
     <string name="invalid_file">El archivo no existe o insuficientes permisos para leerlo o escribir en él</string>
@@ -419,6 +420,8 @@ abrir en modo popup</string>
     <string name="overwrite">Sobrescribir</string>
     <string name="overwrite_warning">Ya existe un archivo descargado con este nombre</string>
     <string name="download_already_running">Hay una descarga en curso con este nombre</string>
+    <string name="download_already_pending">Hay una descarga pendiente con este nombre</string>
+
     <string name="grid">Mostrar como grilla</string>
     <string name="list">Mostrar como lista</string>
     <string name="clear_finished_download">Limpiar descargas finalizadas</string>
@@ -426,8 +429,14 @@ abrir en modo popup</string>
     <string name="stop">Detener</string>
     <string name="max_retry_msg">Intentos máximos</string>
     <string name="max_retry_desc">Cantidad máxima de intentos antes de cancelar la descarga</string>
-    <string name="pause_downloads_on_mobile">Pausar al cambiar a datos moviles</string>
+    <string name="pause_downloads_on_mobile">Interrumpir en redes medidas</string>
-    <string name="pause_downloads_on_mobile_desc">Las descargas que no se pueden pausar serán reiniciadas</string>
+    <string name="pause_downloads_on_mobile_desc">Útil al cambiar a Datos Móviles, solo algunas descargas no se pueden suspender</string>
+    <string name="enable_queue_limit">Limitar cola de descarga</string>
+    <string name="enable_queue_limit_desc">Solo se permitirá una descarga a la vez</string>
+    <string name="start_downloads">Iniciar descargas</string>
+    <string name="pause_downloads">Pausar descargas</string>
+
+
     <!-- message dialog about download error -->
     <string name="show_error">Mostrar error</string>
     <string name="label_code">Codigo</string>
@@ -439,9 +448,12 @@ abrir en modo popup</string>
     <string name="error_connect_host">No se puede conectar con el servidor</string>
     <string name="error_http_no_content">El servidor no devolvio datos</string>
     <string name="error_http_unsupported_range">El servidor no acepta descargas multi-hilos, intente de nuevo con @string/msg_threads = 1</string>
-    <string name="error_http_requested_range_not_satisfiable">El rango solicitado no se puede satisfacer</string>
+    <string name="error_http_requested_range_not_satisfiable">No se logro obtener el rango solicitado</string>
     <string name="error_http_not_found">No encontrado</string>
     <string name="error_postprocessing_failed">Fallo el post-procesado</string>
+    <string name="error_postprocessing_stopped">NewPipe se cerro mientras se trabajaba en el archivo</string>
+    <string name="error_insufficient_storage">No hay suficiente espacio disponible en el dispositivo</string>
+
     <string name="unsubscribe">Desuscribirse</string>
     <string name="tab_new">Nueva pestaña</string>
     <string name="tab_choose">Elige la pestaña</string>

app/src/main/res/values/attrs.xml

@@ -25,6 +25,7 @@
     <attr name="search_add" format="reference"/>
     <attr name="options" format="reference"/>
     <attr name="play" format="reference"/>
+    <attr name="pause" format="reference"/>
     <attr name="bug" format="reference"/>
     <attr name="settings" format="reference"/>
     <attr name="ic_hot" format="reference"/>

app/src/main/res/values/settings_keys.xml

@@ -192,6 +192,7 @@
     </string-array>
 
     <string name="downloads_cross_network" translatable="false">cross_network_downloads</string>
+    <string name="downloads_queue_limit" translatable="false">downloads_queue_limit</string>
 
     <string name="default_download_threads" translatable="false">default_download_threads</string>
 

app/src/main/res/values/strings.xml

@@ -196,6 +196,7 @@
     <string name="invalid_url_toast">Invalid URL</string>
     <string name="video_streams_empty">No video streams found</string>
     <string name="audio_streams_empty">No audio streams found</string>
+    <string name="missing_file">File moved or deleted</string>
     <string name="invalid_directory">No such folder</string>
     <string name="invalid_source">No such file/content source</string>
     <string name="invalid_file">The file doesn\'t exist or permission to read or write to it is lacking</string>
@@ -513,6 +514,8 @@
     <string name="overwrite">Overwrite</string>
     <string name="overwrite_warning">A downloaded file with this name already exists</string>
     <string name="download_already_running">There is a download in progress with this name</string>
+    <string name="download_already_pending">There is a pending download with this name</string>
+
     <!-- message dialog about download error -->
     <string name="show_error">Show error</string>
     <string name="label_code">Code</string>
@@ -527,13 +530,20 @@
     <string name="error_http_requested_range_not_satisfiable">Requested range not satisfiable</string>
     <string name="error_http_not_found">Not found</string>
     <string name="error_postprocessing_failed">Post-processing failed</string>
+    <string name="error_postprocessing_stopped">NewPipe was closed while working on the file</string>
+    <string name="error_insufficient_storage">No space left on device</string>
+
     <string name="clear_finished_download">Clear finished downloads</string>
     <string name="msg_pending_downloads">Continue your %s pending transfers from Downloads</string>
     <string name="stop">Stop</string>
     <string name="max_retry_msg">Maximum retries</string>
     <string name="max_retry_desc">Maximum number of attempts before canceling the download</string>
-    <string name="pause_downloads_on_mobile">Pause on switching to mobile data</string>
+    <string name="pause_downloads_on_mobile">Interrupt on metered networks</string>
-    <string name="pause_downloads_on_mobile_desc">Downloads that can not be paused will be restarted</string>
+    <string name="pause_downloads_on_mobile_desc">Useful when switching to mobile data, although some downloads cannot be suspended</string>
     <string name="close">Close</string>
+    <string name="enable_queue_limit">Limit download queue</string>
+    <string name="enable_queue_limit_desc">One download will run at the same time</string>
+    <string name="start_downloads">Start downloads</string>
+    <string name="pause_downloads">Pause downloads</string>
 
 </resources>

app/src/main/res/values/styles.xml

@@ -41,6 +41,7 @@
         <item name="search_add">@drawable/ic_arrow_top_left_black_24dp</item>
         <item name="options">@drawable/ic_more_vert_black_24dp</item>
         <item name="play">@drawable/ic_play_arrow_black_24dp</item>
+        <item name="pause">@drawable/ic_pause_black_24dp</item>
         <item name="settings">@drawable/ic_settings_black_24dp</item>
         <item name="ic_hot">@drawable/ic_whatshot_black_24dp</item>
         <item name="ic_channel">@drawable/ic_channel_black_24dp</item>
@@ -119,6 +120,7 @@
         <item name="ic_list">@drawable/ic_list_white_24dp</item>
         <item name="ic_grid">@drawable/ic_grid_white_24dp</item>
         <item name="ic_delete">@drawable/ic_delete_white_24dp</item>
+        <item name="pause">@drawable/ic_pause_white_24dp</item>
         <item name="ic_settings_update">@drawable/ic_settings_update_white</item>
 
         <item name="separator_color">@color/dark_separator_color</item>

app/src/main/res/xml/download_settings.xml

@@ -50,4 +50,11 @@
         android:summary="@string/pause_downloads_on_mobile_desc"
         android:title="@string/pause_downloads_on_mobile" />
 
+    <SwitchPreference
+        app:iconSpaceReserved="false"
+        android:defaultValue="true"
+        android:key="@string/downloads_queue_limit"
+        android:summary="@string/enable_queue_limit_desc"
+        android:title="@string/enable_queue_limit" />
+
 </PreferenceScreen>