Propagate erors to ChunkSource implementations.

This can help custom ChunkSource implementations to act on
this information. For example an adaptive implementation may
choose to blacklist a problematic format if loads of that
format keep failing.

library/src/main/java/com/google/android/exoplayer/chunk/ChunkSampleSource.java

@@ -430,6 +430,7 @@ public class ChunkSampleSource implements SampleSource, Loader.Listener {
     currentLoadableExceptionCount++;
     currentLoadableExceptionTimestamp = SystemClock.elapsedRealtime();
     notifyUpstreamError(e);
+    chunkSource.onChunkLoadError(currentLoadableHolder.chunk, e);
     updateLoadControl();
   }
 

library/src/main/java/com/google/android/exoplayer/chunk/ChunkSource.java

@@ -100,4 +100,13 @@ public interface ChunkSource {
    */
   IOException getError();
 
+  /**
+   * Invoked when the {@link ChunkSampleSource} encounters an error loading a chunk obtained from
+   * this source.
+   *
+   * @param chunk The chunk whose load encountered the error.
+   * @param e The error.
+   */
+  void onChunkLoadError(Chunk chunk, Exception e);
+
 }

library/src/main/java/com/google/android/exoplayer/chunk/MultiTrackChunkSource.java

@@ -102,4 +102,9 @@ public class MultiTrackChunkSource implements ChunkSource, ExoPlayerComponent {
     }
   }
 
+  @Override
+  public void onChunkLoadError(Chunk chunk, Exception e) {
+    selectedSource.onChunkLoadError(chunk, e);
+  }
+
 }

library/src/main/java/com/google/android/exoplayer/dash/DashMp4ChunkSource.java

@@ -192,6 +192,11 @@ public class DashMp4ChunkSource implements ChunkSource {
     return null;
   }
 
+  @Override
+  public void onChunkLoadError(Chunk chunk, Exception e) {
+    // Do nothing.
+  }
+  
   private static Chunk newInitializationChunk(Representation representation,
       FragmentedMp4Extractor extractor, DataSource dataSource, int trigger) {
     DataSpec dataSpec = new DataSpec(representation.uri, 0, representation.indexEnd + 1,

library/src/main/java/com/google/android/exoplayer/dash/DashWebmChunkSource.java

@@ -173,6 +173,11 @@ public class DashWebmChunkSource implements ChunkSource {
     return null;
   }
 
+  @Override
+  public void onChunkLoadError(Chunk chunk, Exception e) {
+    // Do nothing.
+  }
+
   private static Chunk newInitializationChunk(Representation representation,
       WebmExtractor extractor, DataSource dataSource, int trigger) {
     DataSpec dataSpec = new DataSpec(representation.uri, 0, representation.indexEnd + 1,

library/src/main/java/com/google/android/exoplayer/smoothstreaming/SmoothStreamingChunkSource.java

@@ -196,6 +196,11 @@ public class SmoothStreamingChunkSource implements ChunkSource {
     return null;
   }
 
+  @Override
+  public void onChunkLoadError(Chunk chunk, Exception e) {
+    // Do nothing.
+  }
+
   private static MediaFormat getMediaFormat(StreamElement streamElement, int trackIndex) {
     TrackElement trackElement = streamElement.tracks[trackIndex];
     String mimeType = trackElement.mimeType;