Merge AssociateStreamWithProducer message into CreateStream message for both audio output and input.

media/audio/audio_output_device.h

 // 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.
 //
 // Audio rendering unit utilizing audio output stream provided by browser
 // process through IPC.
 //
 // Relationship of classes.
 //
 //  AudioOutputController                AudioOutputDevice
@@ skipping 76 matching lines @@
   virtual bool SetVolume(double volume) OVERRIDE;
 
   // Methods called on IO thread ----------------------------------------------
   // AudioOutputIPCDelegate methods.
   virtual void OnStateChanged(AudioOutputIPCDelegate::State state) OVERRIDE;
   virtual void OnStreamCreated(base::SharedMemoryHandle handle,
                                base::SyncSocket::Handle socket_handle,
                                int length) OVERRIDE;
   virtual void OnIPCClosed() OVERRIDE;
 
-  // Creates an uninitialized AudioOutputDevice. Clients must call Initialize()
-  // before using.
+  // Creates an uninitialized AudioOutputDevice.  Takes ownership of |ipc|.
+  // Clients must call Initialize() before using.
   AudioOutputDevice(AudioOutputIPC* ipc,
                     const scoped_refptr<base::MessageLoopProxy>& io_loop);
 
  protected:
   // Magic required by ref_counted.h to avoid any code deleting the object
   // accidentally while there are references to it.
   friend class base::RefCountedThreadSafe<AudioOutputDevice>;
   virtual ~AudioOutputDevice();
 
-  // Accessors for subclasses (via IO thread only).
-  int stream_id() const { return stream_id_; }
-  AudioOutputIPC* audio_output_ipc() const { return ipc_; }
-
  private:
   // Note: The ordering of members in this enum is critical to correct behavior!
   enum State {
     IPC_CLOSED,  // No more IPCs can take place.
     IDLE,  // Not started.
     CREATING_STREAM,  // Waiting for OnStreamCreated() to be called back.
     PAUSED,  // Paused.  OnStreamCreated() has been called.  Can Play()/Stop().
     PLAYING,  // Playing back.  Can Pause()/Stop().
   };
 
   // Methods called on IO thread ----------------------------------------------
   // The following methods are tasks posted on the IO thread that needs to
   // be executed on that thread. They interact with AudioMessageFilter and
   // sends IPC messages on that thread.
   void CreateStreamOnIOThread(const AudioParameters& params);
   void PlayOnIOThread();
   void PauseOnIOThread(bool flush);
   void ShutDownOnIOThread();
   void SetVolumeOnIOThread(double volume);
 
   // MessageLoop::DestructionObserver implementation for the IO loop.
   // If the IO loop dies before we do, we shut down the audio thread from here.
   virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
 
   AudioParameters audio_parameters_;
 
   RenderCallback* callback_;
 
   // A pointer to the IPC layer that takes care of sending requests over to
-  // the AudioRendererHost.
-  AudioOutputIPC* ipc_;
-
-  // Our stream ID on the message filter. Only accessed on the IO thread.
-  // Must only be modified on the IO thread.
-  int stream_id_;
+  // the AudioRendererHost.  Only valid when state_ != IPC_CLOSED and must only
+  // be accessed on the IO thread.
+  const scoped_ptr<AudioOutputIPC> ipc_;
 
   // Current state (must only be accessed from the IO thread).  See comments for
   // State enum above.
   State state_;
 
   // State of Play() / Pause() calls before OnStreamCreated() is called.
   bool play_on_start_;
 
   // Our audio thread callback class.  See source file for details.
   class AudioThreadCallback;
@@ skipping 11 matching lines @@
   // TODO(scherkus): Replace this by changing AudioRendererSink to either accept
   // the callback via Start(). See http://crbug.com/151051 for details.
   bool stopping_hack_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioOutputDevice);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_DEVICE_H_