Report decoder initialization information out of track renderer.

demo/src/main/java/com/google/android/exoplayer/demo/EventLogger.java

@@ -163,6 +163,12 @@ public class EventLogger implements DemoPlayer.Listener, DemoPlayer.InfoListener
     printInternalError("cryptoError", e);
   }
 
+  @Override
+  public void onDecoderInitialized(String decoderName, long elapsedRealtimeMs,
+      long initializationDurationMs) {
+    Log.d(TAG, "decoderInitialized [" + getSessionTimeString() + "]");
+  }
+
   private void printInternalError(String type, Exception e) {
     Log.e(TAG, "internalError [" + getSessionTimeString() + ", " + type + "]", e);
   }

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

@@ -129,6 +129,8 @@ public class DemoPlayer implements ExoPlayer.Listener, ChunkSampleSource.EventLi
     void onLoadStarted(int sourceId, String formatId, int trigger, boolean isInitialization,
         int mediaStartTimeMs, int mediaEndTimeMs, long length);
     void onLoadCompleted(int sourceId, long bytesLoaded);
+    void onDecoderInitialized(String decoderName, long elapsedRealtimeMs,
+        long initializationDurationMs);
   }
 
   /**
@@ -477,6 +479,16 @@ public class DemoPlayer implements ExoPlayer.Listener, ChunkSampleSource.EventLi
     }
   }
 
+  @Override
+  public void onDecoderInitialized(
+      String decoderName,
+      long elapsedRealtimeMs,
+      long initializationDurationMs) {
+    if (infoListener != null) {
+      infoListener.onDecoderInitialized(decoderName, elapsedRealtimeMs, initializationDurationMs);
+    }
+  }
+
   @Override
   public void onUpstreamError(int sourceId, IOException e) {
     if (internalErrorListener != null) {

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

@@ -59,6 +59,17 @@ public abstract class MediaCodecTrackRenderer extends TrackRenderer {
      */
     void onCryptoError(CryptoException e);
 
+    /**
+     * Invoked when a decoder is successfully created.
+     *
+     * @param decoderName The decoder that was configured and created.
+     * @param elapsedRealtimeMs {@code elapsedRealtime} timestamp of when the initialization
+     *    finished.
+     * @param initializationDurationMs Amount of time taken to initialize the decoder.
+     */
+    void onDecoderInitialized(String decoderName, long elapsedRealtimeMs,
+        long initializationDurationMs);
+
   }
 
   /**
@@ -332,9 +343,13 @@ public abstract class MediaCodecTrackRenderer extends TrackRenderer {
     String decoderName = decoderInfo.name;
     codecIsAdaptive = decoderInfo.adaptive;
     try {
+      long codecInitializingTimestamp = SystemClock.elapsedRealtime();
       codec = MediaCodec.createByCodecName(decoderName);
       configureCodec(codec, format.getFrameworkMediaFormatV16(), mediaCrypto);
       codec.start();
+      long codecInitializedTimestamp = SystemClock.elapsedRealtime();
+      notifyDecoderInitialized(decoderName, codecInitializedTimestamp,
+          codecInitializedTimestamp - codecInitializingTimestamp);
       inputBuffers = codec.getInputBuffers();
       outputBuffers = codec.getOutputBuffers();
     } catch (Exception e) {
@@ -846,6 +861,19 @@ public abstract class MediaCodecTrackRenderer extends TrackRenderer {
     }
   }
 
+  private void notifyDecoderInitialized(final String decoderName,
+      final long initializedTimestamp, final long initializationDuration) {
+    if (eventHandler != null && eventListener != null) {
+      eventHandler.post(new Runnable() {
+        @Override
+        public void run() {
+          eventListener.onDecoderInitialized(decoderName, initializedTimestamp,
+              initializationDuration);
+        }
+      });
+    }
+  }
+
   private int getDecodeOnlyIndex(long presentationTimeUs) {
     final int size = decodeOnlyPresentationTimestamps.size();
     for (int i = 0; i < size; i++) {