Reducing the IPC latency for MSE video decoding

content/renderer/media/android/media_source_delegate.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/android/media_source_delegate.h"
 
 #include <limits>
 #include <string>
 #include <vector>
 
@@ skipping 13 matching lines @@
 
 using media::DemuxerStream;
 using media::DemuxerConfigs;
 using media::DemuxerData;
 using blink::WebMediaPlayer;
 using blink::WebString;
 
 namespace {
 
 // The size of the access unit to transfer in an IPC in case of MediaSource.
-// 16: approximately 250ms of content in 60 fps movies.
-const size_t kAccessUnitSizeForMediaSource = 16;
+// 4: approximately 64ms of content in 60 fps movies.
+const size_t kAccessUnitSizeForMediaSource = 4;
 
 const uint8 kVorbisPadding[] = { 0xff, 0xff, 0xff, 0xff };
 
 }  // namespace
 
 namespace content {
 
 static void LogMediaSourceError(const scoped_refptr<media::MediaLog>& media_log,
                                 const std::string& error) {
   media_log->AddEvent(media_log->CreateMediaSourceErrorEvent(error));
@@ skipping 719 matching lines @@
   // current time have been garbage collected or removed by the web app, this is
   // unlikely. This may cause unexpected playback stall due to seek pending an
   // append for a GOP prior to the last GOP demuxed.
   // TODO(wolenetz): Remove the possibility for this seek to cause unexpected
   // player stall by replaying cached data since last keyframe in browser player
   // rather than issuing browser seek. See http://crbug.com/304234.
   return seek_time;
 }
 
 }  // namespace content