Add TYPE_M4A, which is equivalent to TYPE_MP4.

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

@@ -50,6 +50,7 @@ public class DemoUtil {
   public static final int TYPE_TS = 6;
   public static final int TYPE_TS = 6;
   public static final int TYPE_AAC = 7;
   public static final int TYPE_AAC = 7;
   public static final int TYPE_OTHER = 8;
   public static final int TYPE_OTHER = 8;
+  public static final int TYPE_M4A = 9;
 
 
   private static final CookieManager defaultCookieManager;
   private static final CookieManager defaultCookieManager;
 
 

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

@@ -231,6 +231,7 @@ public class PlayerActivity extends Activity implements SurfaceHolder.Callback,
             new WidevineTestMediaDrmCallback(contentId), debugTextView, audioCapabilities);
             new WidevineTestMediaDrmCallback(contentId), debugTextView, audioCapabilities);
       case DemoUtil.TYPE_HLS:
       case DemoUtil.TYPE_HLS:
         return new HlsRendererBuilder(this, userAgent, contentUri.toString(), debugTextView);
         return new HlsRendererBuilder(this, userAgent, contentUri.toString(), debugTextView);
+      case DemoUtil.TYPE_M4A: // There are no file format differences between M4A and MP4.
       case DemoUtil.TYPE_MP4:
       case DemoUtil.TYPE_MP4:
         return new ExtractorRendererBuilder(userAgent, contentUri, debugTextView,
         return new ExtractorRendererBuilder(userAgent, contentUri, debugTextView,
             new Mp4Extractor());
             new Mp4Extractor());