diff --git a/extensions/flac/src/main/java/com/google/android/exoplayer/ext/flac/LibflacAudioTrackRenderer.java b/extensions/flac/src/main/java/com/google/android/exoplayer/ext/flac/LibflacAudioTrackRenderer.java
index cd9d586995..ccc2cbd8b0 100644
--- a/extensions/flac/src/main/java/com/google/android/exoplayer/ext/flac/LibflacAudioTrackRenderer.java
+++ b/extensions/flac/src/main/java/com/google/android/exoplayer/ext/flac/LibflacAudioTrackRenderer.java
@@ -22,8 +22,6 @@ import com.google.android.exoplayer.util.MimeTypes;
 
 import android.os.Handler;
 
-import java.util.List;
-
 /**
  * Decodes and renders audio using the native Flac decoder.
  */
@@ -58,8 +56,8 @@ public class LibflacAudioTrackRenderer extends AudioDecoderTrackRenderer {
   }
 
   @Override
-  protected FlacDecoder createDecoder(List<byte[]> initializationData) throws FlacDecoderException {
-    return new FlacDecoder(NUM_BUFFERS, NUM_BUFFERS, initializationData);
+  protected FlacDecoder createDecoder(Format format) throws FlacDecoderException {
+    return new FlacDecoder(NUM_BUFFERS, NUM_BUFFERS, format.initializationData);
   }
 
 }
diff --git a/extensions/opus/src/main/java/com/google/android/exoplayer/ext/opus/LibopusAudioTrackRenderer.java b/extensions/opus/src/main/java/com/google/android/exoplayer/ext/opus/LibopusAudioTrackRenderer.java
index 5d2249c17d..d70261e058 100644
--- a/extensions/opus/src/main/java/com/google/android/exoplayer/ext/opus/LibopusAudioTrackRenderer.java
+++ b/extensions/opus/src/main/java/com/google/android/exoplayer/ext/opus/LibopusAudioTrackRenderer.java
@@ -22,8 +22,6 @@ import com.google.android.exoplayer.util.MimeTypes;
 
 import android.os.Handler;
 
-import java.util.List;
-
 /**
  * Decodes and renders audio using the native Opus decoder.
  */
@@ -67,9 +65,9 @@ public final class LibopusAudioTrackRenderer extends AudioDecoderTrackRenderer {
   }
 
   @Override
-  protected OpusDecoder createDecoder(List<byte[]> initializationData) throws OpusDecoderException {
+  protected OpusDecoder createDecoder(Format format) throws OpusDecoderException {
     return new OpusDecoder(NUM_BUFFERS, NUM_BUFFERS, INITIAL_INPUT_BUFFER_SIZE,
-        initializationData);
+        format.initializationData);
   }
 
 }
diff --git a/library/src/main/java/com/google/android/exoplayer/extensions/AudioDecoderTrackRenderer.java b/library/src/main/java/com/google/android/exoplayer/extensions/AudioDecoderTrackRenderer.java
index 6cfc018ec9..bc536f5287 100644
--- a/library/src/main/java/com/google/android/exoplayer/extensions/AudioDecoderTrackRenderer.java
+++ b/library/src/main/java/com/google/android/exoplayer/extensions/AudioDecoderTrackRenderer.java
@@ -31,8 +31,6 @@ import com.google.android.exoplayer.util.MimeTypes;
 
 import android.os.Handler;
 
-import java.util.List;
-
 /**
  * Decodes and renders audio using a {@link SimpleDecoder}.
  */
@@ -103,7 +101,7 @@ public abstract class AudioDecoderTrackRenderer extends TrackRenderer implements
     // If we don't have a decoder yet, we need to instantiate one.
     if (decoder == null) {
       try {
-        decoder = createDecoder(format.initializationData);
+        decoder = createDecoder(format);
       } catch (AudioDecoderException e) {
         throw ExoPlaybackException.createForRenderer(e, getIndex());
       }
@@ -132,8 +130,7 @@ public abstract class AudioDecoderTrackRenderer extends TrackRenderer implements
   }
 
   protected abstract SimpleDecoder<DecoderInputBuffer, ? extends SimpleOutputBuffer,
-      ? extends AudioDecoderException> createDecoder(List<byte[]> initializationData)
-      throws AudioDecoderException;
+      ? extends AudioDecoderException> createDecoder(Format format) throws AudioDecoderException;
 
   private void renderBuffer() throws AudioDecoderException, AudioTrack.InitializationException,
       AudioTrack.WriteException {