Use FF_THREAD_SLICE threading mode in FFmpeg for MediaSource streams.

content/renderer/media/webmediaplayer_impl.cc

Index: content/renderer/media/webmediaplayer_impl.cc
diff --git a/content/renderer/media/webmediaplayer_impl.cc b/content/renderer/media/webmediaplayer_impl.cc
index b314732cf47c2ba22f1f12c39a0466308def80c8..b6bedb9e7ca43bba7c19605d1fc854307becd967 100644
--- a/content/renderer/media/webmediaplayer_impl.cc
+++ b/content/renderer/media/webmediaplayer_impl.cc
@@ -1139,7 +1139,14 @@ void WebMediaPlayerImpl::StartPipeline() {
   video_decoders.push_back(new media::VpxVideoDecoder(media_loop_));
 #endif  // !defined(MEDIA_DISABLE_LIBVPX)
 
-  video_decoders.push_back(new media::FFmpegVideoDecoder(media_loop_));
+  // Use slice-based threading for MediaSource streams to make sure the decoder
+  // doesn't retain decoded frames.
+  media::FFmpegVideoDecoder::ThreadingMode threading_mode =
+      load_type_ == LoadTypeMediaSource
+          ? media::FFmpegVideoDecoder::THREADING_SLICE
+          : media::FFmpegVideoDecoder::THREADING_FRAME;
+  video_decoders.push_back(new media::FFmpegVideoDecoder(media_loop_,
+    threading_mode));

[Ami GONE FROM CHROMIUM, 2014/01/28 07:17:10]

git cl format

 
   scoped_ptr<media::VideoRenderer> video_renderer(
       new media::VideoRendererImpl(