Reland: Remove reference counting from media::VideoDecoder and friends.

media/filters/vpx_video_decoder.cc

 // Copyright (c) 2012 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 "media/filters/vpx_video_decoder.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/location.h"
@@ skipping 40 matching lines @@
     return decode_threads;
 
   decode_threads = std::max(decode_threads, 0);
   decode_threads = std::min(decode_threads, kMaxDecodeThreads);
   return decode_threads;
 }
 
 VpxVideoDecoder::VpxVideoDecoder(
     const scoped_refptr<base::MessageLoopProxy>& message_loop)
     : message_loop_(message_loop),
+      weak_factory_(this),
       state_(kUninitialized),
       vpx_codec_(NULL) {
 }
 
 VpxVideoDecoder::~VpxVideoDecoder() {
   DCHECK_EQ(kUninitialized, state_);
   CloseDecoder();
 }
 
 void VpxVideoDecoder::Initialize(
     const scoped_refptr<DemuxerStream>& stream,
     const PipelineStatusCB& status_cb,
     const StatisticsCB& statistics_cb) {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK(!demuxer_stream_) << "Already initialized.";
+  weak_this_ = weak_factory_.GetWeakPtr();
 
   if (!stream) {
     status_cb.Run(PIPELINE_ERROR_DECODE);
     return;
   }
 
   demuxer_stream_ = stream;
   statistics_cb_ = statistics_cb;
 
   if (!ConfigureDecoder()) {
@@ skipping 89 matching lines @@
   state_ = kUninitialized;
   closure.Run();
 }
 
 void VpxVideoDecoder::ReadFromDemuxerStream() {
   DCHECK_NE(state_, kUninitialized);
   DCHECK_NE(state_, kDecodeFinished);
   DCHECK(!read_cb_.is_null());
 
   demuxer_stream_->Read(base::Bind(
-      &VpxVideoDecoder::DoDecryptOrDecodeBuffer, this));
+      &VpxVideoDecoder::DoDecryptOrDecodeBuffer, weak_this_));
 }
 
 void VpxVideoDecoder::DoDecryptOrDecodeBuffer(
     DemuxerStream::Status status,
     const scoped_refptr<DecoderBuffer>& buffer) {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK_NE(state_, kDecodeFinished);
   DCHECK_EQ(status != DemuxerStream::kOk, !buffer) << status;
 
   if (state_ == kUninitialized)
@@ skipping 136 matching lines @@
              vpx_image->stride[VPX_PLANE_U],
              vpx_image->d_h / 2,
              *video_frame);
   CopyVPlane(vpx_image->planes[VPX_PLANE_V],
              vpx_image->stride[VPX_PLANE_V],
              vpx_image->d_h / 2,
              *video_frame);
 }
 
 }  // namespace media