Detect errors in audio output and report them upstream.

media/filters/ffmpeg_demuxer.h

Index: media/filters/ffmpeg_demuxer.h
diff --git a/media/filters/ffmpeg_demuxer.h b/media/filters/ffmpeg_demuxer.h
index 66c6ac57d4ee060c730f25737b0af171ab21d669..a1801132449c95be432fc1b276c26f133327951c 100644
--- a/media/filters/ffmpeg_demuxer.h
+++ b/media/filters/ffmpeg_demuxer.h
@@ -261,6 +261,10 @@ class MEDIA_EXPORT FFmpegDemuxer : public Demuxer, public FFmpegURLProtocol {
   // is 0.
   base::TimeDelta start_time_;
 
+  // Whether audio has been disabled for this demuxer (in which case this class
+  // drops packets destined for AUDIO demuxer streams on the floor).
+  bool audio_disabled_;

[scherkus (not reviewing), 2012/01/26 21:46:13]

QQ: this change wasn't mentioned in the CL description

was there something wonky w/ the previous code path? (it wouldn't surprise me if
there was)

[Ami GONE FROM CHROMIUM, 2012/01/26 22:11:01]

Done.
Yes; the AUDIO demuxerstream would be Stop()'d but then continue to receive
EnqueuePacket()s, triggering a NOTREACHED().

+
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxer);
 };