Implements AudioMessageFilter as member in RenderThread

content/renderer/media/audio_renderer_impl.h

 // 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.
 //
 // Audio rendering unit utilizing audio output stream provided by browser
 // process through IPC.
 //
 // Relationship of classes.
 //
 //    AudioRendererHost                AudioRendererImpl
@@ skipping 38 matching lines @@
 #include "media/base/filters.h"
 #include "media/filters/audio_renderer_base.h"
 
 class AudioMessageFilter;
 
 class AudioRendererImpl : public media::AudioRendererBase,
                           public AudioMessageFilter::Delegate,
                           public MessageLoop::DestructionObserver {
  public:
   // Methods called on Render thread ------------------------------------------
-  explicit AudioRendererImpl(AudioMessageFilter* filter);
+  AudioRendererImpl();
   virtual ~AudioRendererImpl();
 
   // Methods called on IO thread ----------------------------------------------
   // AudioMessageFilter::Delegate methods, called by AudioMessageFilter.
   virtual void OnRequestPacket(AudioBuffersState buffers_state);
   virtual void OnStateChanged(AudioStreamState state);
   virtual void OnCreated(base::SharedMemoryHandle handle, uint32 length);
   virtual void OnLowLatencyCreated(base::SharedMemoryHandle handle,
                                    base::SyncSocket::Handle socket_handle,
                                    uint32 length);
@@ skipping 37 matching lines @@
   void PlayTask();
   void PauseTask();
   void SeekTask();
   void SetVolumeTask(double volume);
   void NotifyPacketReadyTask();
   void DestroyTask();
 
   // Called on IO thread when message loop is dying.
   virtual void WillDestroyCurrentMessageLoop();
 
+  void Send(IPC::Message* message);
+
   // Used to calculate audio delay given bytes.
   uint32 bytes_per_second_;
 
-  scoped_refptr<AudioMessageFilter> filter_;
-
   // ID of the stream created in the browser process.
   int32 stream_id_;
 
   // Memory shared by the browser process for audio buffer.
   scoped_ptr<base::SharedMemory> shared_memory_;
   uint32 shared_memory_size_;
 
   // Message loop for the IO thread.
   MessageLoop* io_loop_;
 
+  // Cached audio message filter (lives on the main render thread).
+  scoped_refptr<AudioMessageFilter> filter_;
+
   // Protects:
   // - |stopped_|
   // - |pending_request_|
   // - |request_buffers_state_|
   base::Lock lock_;
 
   // A flag that indicates this filter is called to stop.
   bool stopped_;
 
   // A flag that indicates an outstanding packet request.
   bool pending_request_;
 
   // State of the audio buffers at time of the last request.
   AudioBuffersState request_buffers_state_;
 
   // State variables for prerolling.
   bool prerolling_;
 
   // Remaining bytes for prerolling to complete.
   uint32 preroll_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererImpl);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_AUDIO_RENDERER_IMPL_H_