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

content/renderer/media/audio_message_filter.h

Index: content/renderer/media/audio_message_filter.h
diff --git a/content/renderer/media/audio_message_filter.h b/content/renderer/media/audio_message_filter.h
index 7c352d626df66f992000d39fae1b7b1a31b33467..42adb66b13fb071f7458afd0533d859d45f1e365 100644
--- a/content/renderer/media/audio_message_filter.h
+++ b/content/renderer/media/audio_message_filter.h
@@ -7,6 +7,7 @@
 
 #include "base/gtest_prod_util.h"
 #include "base/id_map.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/shared_memory.h"
 #include "base/sync_socket.h"
 #include "base/synchronization/lock.h"
@@ -26,8 +27,7 @@ namespace content {
 // IO thread (secondary thread of render process) it intercepts audio messages
 // and process them on IO thread since these messages are time critical.
 class CONTENT_EXPORT AudioMessageFilter
-    : public IPC::ChannelProxy::MessageFilter,
-      public NON_EXPORTED_BASE(media::AudioOutputIPC) {
+    : public IPC::ChannelProxy::MessageFilter {
  public:
   explicit AudioMessageFilter(
       const scoped_refptr<base::MessageLoopProxy>& io_message_loop);
@@ -35,27 +35,12 @@ class CONTENT_EXPORT AudioMessageFilter
   // Getter for the one AudioMessageFilter object.
   static AudioMessageFilter* Get();
 
-  // Associates |render_view_id| as the source of audio rendered for a stream.
-  void AssociateStreamWithProducer(int stream_id, int render_view_id);
-
-  // media::AudioOutputIPC implementation.
-  virtual int AddDelegate(media::AudioOutputIPCDelegate* delegate) OVERRIDE;
-  virtual void RemoveDelegate(int id) OVERRIDE;
-
-  // Methods below must be called on the provided |io_message_loop|.
-  virtual void CreateStream(int stream_id,
-                            const media::AudioParameters& params) OVERRIDE;
-  virtual void PlayStream(int stream_id) OVERRIDE;
-  virtual void PauseStream(int stream_id) OVERRIDE;
-  virtual void FlushStream(int stream_id) OVERRIDE;
-  virtual void CloseStream(int stream_id) OVERRIDE;
-  virtual void SetVolume(int stream_id, double volume) OVERRIDE;
-
-  // IPC::ChannelProxy::MessageFilter override. Called on |io_message_loop|.
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-  virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
-  virtual void OnFilterRemoved() OVERRIDE;
-  virtual void OnChannelClosing() OVERRIDE;
+  // Create an AudioOutputIPC to be owned by one delegate.  |render_view_id| is
+  // the render view containing the entity producing the audio.
+  //
+  // The returned object is not thread-safe, and must be used on
+  // |io_message_loop|.
+  scoped_ptr<media::AudioOutputIPC> CreateAudioOutputIPC(int render_view_id);
 
   // When set, AudioMessageFilter will update the AudioHardwareConfig with new
   // configuration values as recieved by OnOutputDeviceChanged().  The provided
@@ -74,9 +59,19 @@ class CONTENT_EXPORT AudioMessageFilter
   FRIEND_TEST_ALL_PREFIXES(AudioMessageFilterTest, Basic);
   FRIEND_TEST_ALL_PREFIXES(AudioMessageFilterTest, Delegates);
 
+  // Implementation of media::AudioOutputIPC which augments IPC calls with
+  // stream_id and the source render_view_id.
+  class AudioOutputIPCImpl;
+
   // Sends an IPC message using |channel_|.
   void Send(IPC::Message* message);
 
+  // IPC::ChannelProxy::MessageFilter override. Called on |io_message_loop|.
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
+  virtual void OnFilterRemoved() OVERRIDE;
+  virtual void OnChannelClosing() OVERRIDE;
+
   // Received when browser process has created an audio output stream.
   void OnStreamCreated(int stream_id, base::SharedMemoryHandle handle,
 #if defined(OS_WIN)
@@ -95,9 +90,6 @@ class CONTENT_EXPORT AudioMessageFilter
   void OnOutputDeviceChanged(int stream_id, int new_buffer_size,
                              int new_sample_rate);
 
-  // The singleton instance for this filter.
-  static AudioMessageFilter* filter_;
-
   // IPC channel for Send(); must only be accesed on |io_message_loop_|.
   IPC::Channel* channel_;