Change DemuxerStream::ReadCallback to use ref-counted buffers.

media/filters/chunk_demuxer.cc

 // Copyright (c) 2011 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.
 
 // Implements a Demuxer that can switch among different data sources mid-stream.
 // Uses FFmpegDemuxer under the covers, so see the caveats at the top of
 // ffmpeg_demuxer.h.
 
 #include "media/filters/chunk_demuxer.h"
 
@@ skipping 206 matching lines @@
   if (buffers_.empty())
     return false;
 
   *timestamp = buffers_.back()->GetTimestamp();
   return true;
 }
 
 // Helper function that makes sure |read_callback| runs on |message_loop|.
 static void RunOnMessageLoop(const DemuxerStream::ReadCallback& read_callback,
                              MessageLoop* message_loop,
-                             Buffer* buffer) {
+                             const scoped_refptr<Buffer>& buffer) {
   if (MessageLoop::current() != message_loop) {
     message_loop->PostTask(FROM_HERE, base::Bind(
-        &RunOnMessageLoop, read_callback, message_loop,
-        scoped_refptr<Buffer>(buffer)));
+        &RunOnMessageLoop, read_callback, message_loop, buffer));
     return;
   }
 
   read_callback.Run(buffer);
 }
 
 // DemuxerStream methods.
 void ChunkDemuxerStream::Read(const ReadCallback& read_callback) {
   scoped_refptr<Buffer> buffer;
 
@@ skipping 497 matching lines @@
     base::AutoUnlock auto_unlock(lock_);
     if (cb.is_null()) {
       host()->SetError(error);
       return;
     }
     cb.Run(error);
   }
 }
 
 }  // namespace media