[YouTube] Mark auto-dubbed streams as auto-generated

Marks auto-dubbed audio tracks as auto-generated. This allows applications to
handle them differently to non-auto-generated audio tracks, e.g. display this
information to the user.

Author: FineFindus

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/ItagItem.java

@@ -218,6 +218,7 @@ public ItagItem(@Nonnull final ItagItem itagItem) {
         this.isDrc = itagItem.isDrc;
         this.lastModified = itagItem.lastModified;
         this.xtags = itagItem.xtags;
+        this.autoGenerated = itagItem.autoGenerated;
     }
 
     public MediaFormat getMediaFormat() {
@@ -273,6 +274,7 @@ public MediaFormat getMediaFormat() {
     private boolean isDrc;
     private long lastModified;
     private String xtags;
+    private boolean autoGenerated;
 
     public int getBitrate() {
         return bitrate;
@@ -727,4 +729,23 @@ public String getXtags() {
     public void setXtags(final String xtags) {
         this.xtags = xtags;
     }
+
+    /**
+     * Return whether the stream is auto-generated.
+     *
+     * @return {@code true} if the stream is auto-generated, {@code false} otherwise
+     */
+    public boolean isAutoGenerated() {
+        return autoGenerated;
+    }
+
+
+    /**
+     * Set whether the stream has been auto-generated.
+     *
+     * @param autoGenerated whether the stream has been automatically generated
+     */
+    public void setAutoGenerated(final boolean autoGenerated) {
+        this.autoGenerated = autoGenerated;
+    }
 }

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

@@ -1365,8 +1365,9 @@ private ItagInfo buildAndAddItagInfoToList(
                 itagItem.setAudioTrackType(YoutubeParsingHelper.extractAudioTrackType(streamUrl));
             }
 
-            itagItem.setAudioTrackName(formatData.getObject("audioTrack")
-                    .getString("displayName"));
+            final JsonObject audioTrack = formatData.getObject("audioTrack");
+            itagItem.setAudioTrackName(audioTrack.getString("displayName"));
+            itagItem.setAutoGenerated(audioTrack.getBoolean("isAutoDubbed", false));
         }
 
         // YouTube return the content length and the approximate duration as strings

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/stream/YoutubeStreamExtractorDefaultTest.java

@@ -622,4 +622,24 @@ void testCheckDescriptiveAudio() throws Exception {
                     .anyMatch(s -> s.getAudioTrackType() == AudioTrackType.DESCRIPTIVE));
         }
     }
+
+    public static class AutoGeneratedAudio extends DefaultSimpleExtractorTest<StreamExtractor>
+        implements InitYoutubeTest {
+        private static final String ID = "3JW3J4_Ukrs";
+        private static final String URL = BASE_URL + ID;
+
+        @Override
+        protected StreamExtractor createExtractor() throws Exception {
+            return YouTube.getStreamExtractor(URL);
+        }
+
+        @Test
+        void testAutogeneratedTracks() throws Exception {
+            assertFalse(extractor().getAudioStreams().isEmpty());
+
+            assertTrue(extractor().getAudioStreams()
+                    .stream()
+                    .anyMatch(s -> s.getItagItem().isAutoGenerated()));
+        }
+    }
 }