Add streamPosition for comments

SoundCloud is the only service which supports adding comments at a specific timestamp in the stream.

extractor/src/main/java/org/schabi/newpipe/extractor/comments/CommentsInfoItem.java

@@ -20,6 +20,9 @@ public class CommentsInfoItem extends InfoItem {
     private String textualLikeCount;
     private boolean heartedByUploader;
     private boolean pinned;
+    private int streamPosition;
+
+    public static final int NO_STREAM_POSITION = -1;
 
     public CommentsInfoItem(int serviceId, String url, String name) {
         super(InfoType.COMMENT, serviceId, url, name);
@@ -121,4 +124,17 @@ public class CommentsInfoItem extends InfoItem {
     public boolean isUploaderVerified() {
         return uploaderVerified;
     }
+
+    public void setStreamPosition(final int streamPosition) {
+        this.streamPosition = streamPosition;
+    }
+
+    /**
+     * Get the playback position of the stream to which this comment belongs.
+     * This is not supported by all services.
+     * @return the playback position in seconds or {@link #NO_STREAM_POSITION} if not available
+     */
+    public int getStreamPosition() {
+        return streamPosition;
+    }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/comments/CommentsInfoItemExtractor.java

@@ -94,4 +94,12 @@ public interface CommentsInfoItemExtractor extends InfoItemExtractor {
     default boolean isUploaderVerified() throws ParsingException {
         return false;
     }
+
+    /**
+     * The playback position of the stream to which this comment belongs.
+     * @see CommentsInfoItem#getStreamPosition()
+     */
+    default int getStreamPosition() throws ParsingException {
+        return CommentsInfoItem.NO_STREAM_POSITION;
+    }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/comments/CommentsInfoItemsCollector.java

@@ -87,6 +87,12 @@ public class CommentsInfoItemsCollector extends InfoItemsCollector<CommentsInfoI
             addError(e);
         }
 
+        try {
+            resultItem.setStreamPosition(extractor.getStreamPosition());
+        } catch (Exception e) {
+            addError(e);
+        }
+
         return resultItem;
     }
 

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudCommentsInfoItemExtractor.java

@@ -43,6 +43,11 @@ public class SoundcloudCommentsInfoItemExtractor implements CommentsInfoItemExtr
         return json.getObject("user").getBoolean("verified");
     }
 
+    @Override
+    public int getStreamPosition() throws ParsingException {
+        return json.getInt("timestamp") / 1000; // convert milliseconds to seconds
+    }
+
     @Override
     public String getUploaderUrl() {
         return json.getObject("user").getString("permalink_url");
@@ -65,7 +70,7 @@ public class SoundcloudCommentsInfoItemExtractor implements CommentsInfoItemExtr
     }
 
     @Override
-    public String getUrl() throws ParsingException {
+    public String getUrl() {
         return url;
     }
 

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeCommentsInfoItemExtractor.java

@@ -184,7 +184,7 @@ public class YoutubeCommentsInfoItemExtractor implements CommentsInfoItemExtract
         return json.has("pinnedCommentBadge");
     }
 
-    public boolean isUploaderVerified() throws ParsingException {
+    public boolean isUploaderVerified() {
         // impossible to get this information from the mobile layout
         return false;
     }