Use FF_THREAD_SLICE threading mode in FFmpeg for MediaSource streams.

content/renderer/media/webmediaplayer_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/webmediaplayer_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 #include <vector>
@@ skipping 1121 matching lines @@
 
   if (gpu_factories_.get()) {
     video_decoders.push_back(
         new media::GpuVideoDecoder(gpu_factories_, media_log_));
   }
 
 #if !defined(MEDIA_DISABLE_LIBVPX)
   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(
           media_loop_,
           video_decoders.Pass(),
           set_decryptor_ready_cb,
           base::Bind(&WebMediaPlayerImpl::FrameReady, base::Unretained(this)),
           BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::SetOpaque),
           true));
   filter_collection->SetVideoRenderer(video_renderer.Pass());
@@ skipping 153 matching lines @@
 
   if (web_cdm_) {
     decryptor_ready_cb.Run(web_cdm_->GetDecryptor());
     return;
   }
 
   decryptor_ready_cb_ = decryptor_ready_cb;
 }
 
 }  // namespace content