[media.ccc.de] Fix live streams extraction

The API was slightly changed and only HLS streams are provided anymore.

Add a basic test for to check whether the required streamInfo fields are available.

Closes #766

extractor/src/main/java/org/schabi/newpipe/extractor/services/media_ccc/extractors/MediaCCCLiveStreamExtractor.java

@@ -93,17 +93,14 @@ public class MediaCCCLiveStreamExtractor extends StreamExtractor {
     @Override
     public String getHlsUrl() {
         // TODO: There are multiple HLS streams.
-        //       Make getHlsUrl() and getDashMpdUrl() return lists of VideoStreams, so the user can choose a resolution.
+        //       Make getHlsUrl() and getDashMpdUrl() return lists of VideoStreams
+        //       to allow selecting a resolution.
         for (int s = 0; s < room.getArray("streams").size(); s++) {
             final JsonObject stream = room.getArray("streams").getObject(s);
-            if (stream.getString("type").equals("video")) {
-                final String resolution = stream.getArray("videoSize").getInt(0) + "x"
-                        + stream.getArray("videoSize").getInt(1);
-                if (stream.has("hls")) {
+            if (stream.getString("type").equals("video") && stream.getObject("urls").has("hls")) {
                 return stream.getObject("urls").getObject("hls").getString("url");
             }
         }
-        }
         return "";
     }
 
@@ -114,8 +111,11 @@ public class MediaCCCLiveStreamExtractor extends StreamExtractor {
             final JsonObject stream = room.getArray("streams").getObject(s);
             if (stream.getString("type").equals("audio")) {
                 for (final String type : stream.getObject("urls").keySet()) {
+                    if (!type.equals("hls")) {
                         final JsonObject url = stream.getObject("urls").getObject(type);
-                    audioStreams.add(new AudioStream(url.getString("url"), MediaFormat.getFromSuffix(type), -1));
+                        audioStreams.add(new AudioStream(
+                                url.getString("url"), MediaFormat.getFromSuffix(type), -1));
+                    }
                 }
             }
         }

extractor/src/main/java/org/schabi/newpipe/extractor/stream/StreamInfo.java

@@ -139,13 +139,13 @@ public class StreamInfo extends Info {
         } catch (Exception e) {
             streamInfo.addError(new ExtractionException("Couldn't get audio streams", e));
         }
-        /* Extract video stream url */
+        /* Extract video streams */
         try {
             streamInfo.setVideoStreams(extractor.getVideoStreams());
         } catch (Exception e) {
             streamInfo.addError(new ExtractionException("Couldn't get video streams", e));
         }
-        /* Extract video only stream url */
+        /* Extract video only streams */
         try {
             streamInfo.setVideoOnlyStreams(extractor.getVideoOnlyStreams());
         } catch (Exception e) {
@@ -181,13 +181,16 @@ public class StreamInfo extends Info {
 
         // Either audio or video has to be available, otherwise we didn't get a stream
         // (since videoOnly are optional, they don't count).
-        if ((streamInfo.videoStreams.isEmpty()) && (streamInfo.audioStreams.isEmpty())) {
+        if (streamInfo.videoStreams.isEmpty()
+                && streamInfo.audioStreams.isEmpty()
+                && isNullOrEmpty(streamInfo.getHlsUrl())
+                && isNullOrEmpty(streamInfo.getDashMpdUrl())) {
 
             if (dashMpdError != null) {
                 // If we don't have any video or audio and the dashMpd 'errored', add it to the
                 // error list
-                // (it's optional and it don't get added automatically, but it's good to have
-                // some additional error context)
+                // (It's optional, and it is not added automatically,
+                // but it's good to have some additional error context).
                 streamInfo.addError(dashMpdError);
             }
 

extractor/src/test/java/org/schabi/newpipe/extractor/services/media_ccc/MediaCCCLiveStreamExtractorTest.java

@@ -0,0 +1,52 @@
+package org.schabi.newpipe.extractor.services.media_ccc;
+
+import org.junit.Assert;
+import org.junit.Assume;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.schabi.newpipe.downloader.DownloaderTestImpl;
+import org.schabi.newpipe.extractor.InfoItem;
+import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.exceptions.ExtractionException;
+import org.schabi.newpipe.extractor.kiosk.KioskExtractor;
+import org.schabi.newpipe.extractor.stream.StreamExtractor;
+import org.schabi.newpipe.extractor.stream.StreamInfo;
+
+import java.io.IOException;
+import java.util.List;
+
+import static org.schabi.newpipe.extractor.ServiceList.MediaCCC;
+
+public class MediaCCCLiveStreamExtractorTest {
+
+    private static KioskExtractor liveKiosk;
+    private static StreamExtractor extractor;
+
+    private static List<InfoItem> liveItems;
+
+    @BeforeClass
+    public static void setUp() throws Exception {
+        NewPipe.init(DownloaderTestImpl.getInstance());
+        liveKiosk = MediaCCC.getKioskList().getExtractorById("live", null);
+        liveKiosk.fetchPage();
+        liveItems = liveKiosk.getInitialPage().getItems();
+        Assume.assumeFalse(
+                "Received an empty list of live streams. Skipping MediaCCCLiveStreamExtractorTest",
+                liveItems.isEmpty());
+    }
+
+    @Test
+    public void testRequiredStreamInfo() {
+        // Try to get the StreamInfo for each live stream.
+        // If some required info is not present an exception will be thrown.
+        try {
+            for (final InfoItem item : liveItems) {
+                StreamInfo.getInfo(item.getUrl());
+            }
+        } catch (ExtractionException | IOException e) {
+            e.printStackTrace();
+            Assert.fail("An exception was thrown while getting a StreamInfo for a livestream.");
+        }
+    }
+
+}