Added loadErrorNotification to SingleSampleSource.

Also hooked up DemoPlayer to ExtractorSampleSource events.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=117809051

demo/src/main/java/com/google/android/exoplayer/demo/player/DemoPlayer.java

@@ -26,6 +26,7 @@ import com.google.android.exoplayer.MediaCodecSelector;
 import com.google.android.exoplayer.MediaCodecTrackRenderer.DecoderInitializationException;
 import com.google.android.exoplayer.MediaCodecVideoTrackRenderer;
 import com.google.android.exoplayer.SampleSource;
+import com.google.android.exoplayer.SingleSampleSource;
 import com.google.android.exoplayer.TimeRange;
 import com.google.android.exoplayer.TrackRenderer;
 import com.google.android.exoplayer.audio.AudioCapabilities;
@@ -33,6 +34,7 @@ import com.google.android.exoplayer.audio.AudioTrack;
 import com.google.android.exoplayer.chunk.ChunkSampleSource;
 import com.google.android.exoplayer.dash.DashChunkSource;
 import com.google.android.exoplayer.drm.StreamingDrmSessionManager;
+import com.google.android.exoplayer.extractor.ExtractorSampleSource;
 import com.google.android.exoplayer.hls.HlsSampleSource;
 import com.google.android.exoplayer.metadata.MetadataTrackRenderer;
 import com.google.android.exoplayer.metadata.MetadataTrackRenderer.MetadataRenderer;
@@ -64,6 +66,7 @@ import java.util.concurrent.CopyOnWriteArrayList;
  */
 public class DemoPlayer implements ExoPlayer.Listener, DefaultTrackSelector.EventListener,
     ChunkSampleSource.EventListener, HlsSampleSource.EventListener,
+    ExtractorSampleSource.EventListener, SingleSampleSource.EventListener,
     DefaultBandwidthMeter.EventListener, MediaCodecVideoTrackRenderer.EventListener,
     MediaCodecAudioTrackRenderer.EventListener, StreamingDrmSessionManager.EventListener,
     DashChunkSource.EventListener, TextRenderer, MetadataRenderer<List<Id3Frame>>,

demo/src/main/java/com/google/android/exoplayer/demo/player/ExtractorSourceBuilder.java

@@ -51,7 +51,7 @@ public class ExtractorSourceBuilder implements SourceBuilder {
     DataSource dataSource = new DefaultUriDataSource(context, player.getBandwidthMeter(),
         userAgent);
     return new ExtractorSampleSource(uri, dataSource, allocator,
-        BUFFER_SEGMENT_COUNT * BUFFER_SEGMENT_SIZE);
+        BUFFER_SEGMENT_COUNT * BUFFER_SEGMENT_SIZE, player.getMainHandler(), player, 0);
   }
 
 }

library/src/main/java/com/google/android/exoplayer/SingleSampleSource.java

@@ -22,6 +22,7 @@ import com.google.android.exoplayer.upstream.Loader.Loadable;
 import com.google.android.exoplayer.util.Assertions;
 
 import android.net.Uri;
+import android.os.Handler;
 import android.os.SystemClock;
 
 import java.io.IOException;
@@ -33,6 +34,21 @@ import java.util.Arrays;
 public final class SingleSampleSource implements SampleSource, TrackStream, Loader.Callback,
     Loadable {
 
+  /**
+   * Interface definition for a callback to be notified of {@link SingleSampleSource} events.
+   */
+  public interface EventListener {
+
+    /**
+     * Invoked when an error occurs loading media data.
+     *
+     * @param sourceId The id of the reporting {@link SampleSource}.
+     * @param e The cause of the failure.
+     */
+    void onLoadError(int sourceId, IOException e);
+
+  }
+
   /**
    * The default minimum number of times to retry loading data prior to failing.
    */
@@ -53,6 +69,9 @@ public final class SingleSampleSource implements SampleSource, TrackStream, Load
   private final long durationUs;
   private final int minLoadableRetryCount;
   private final TrackGroupArray tracks;
+  private final Handler eventHandler;
+  private final EventListener eventListener;
+  private final int eventSourceId;
 
   private int state;
   private byte[] sampleData;
@@ -71,11 +90,20 @@ public final class SingleSampleSource implements SampleSource, TrackStream, Load
 
   public SingleSampleSource(Uri uri, DataSource dataSource, Format format, long durationUs,
       int minLoadableRetryCount) {
+    this(uri, dataSource, format, durationUs, minLoadableRetryCount, null, null, 0);
+  }
+
+  public SingleSampleSource(Uri uri, DataSource dataSource, Format format, long durationUs,
+      int minLoadableRetryCount, Handler eventHandler, EventListener eventListener,
+      int eventSourceId) {
     this.uri = uri;
     this.dataSource = dataSource;
     this.format = format;
     this.durationUs = durationUs;
     this.minLoadableRetryCount = minLoadableRetryCount;
+    this.eventHandler = eventHandler;
+    this.eventListener = eventListener;
+    this.eventSourceId = eventSourceId;
     tracks = new TrackGroupArray(new TrackGroup(format));
     sampleData = new byte[INITIAL_SAMPLE_SIZE];
   }
@@ -224,6 +252,7 @@ public final class SingleSampleSource implements SampleSource, TrackStream, Load
     currentLoadableException = e;
     currentLoadableExceptionCount++;
     currentLoadableExceptionTimestamp = SystemClock.elapsedRealtime();
+    notifyLoadError(e);
     maybeStartLoading();
   }
 
@@ -260,4 +289,15 @@ public final class SingleSampleSource implements SampleSource, TrackStream, Load
     }
   }
 
+  private void notifyLoadError(final IOException e) {
+    if (eventHandler != null && eventListener != null) {
+      eventHandler.post(new Runnable()  {
+        @Override
+        public void run() {
+          eventListener.onLoadError(eventSourceId, e);
+        }
+      });
+    }
+  }
+
 }