Associate audio streams with their source/destination RenderView.

content/renderer/media/audio_device_factory.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.
-
-#ifndef CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_FACTORY_H_
-#define CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_FACTORY_H_
-
-#include "base/basictypes.h"
-#include "content/common/content_export.h"
-
-namespace media {
-class AudioInputDevice;
-class AudioRendererSink;
-}
-
-namespace content {
-
-// A factory for creating AudioRendererSinks. There is a global factory
-// function that can be installed for the purposes of testing to provide
-// a specialized AudioRendererSink class.
-class CONTENT_EXPORT AudioDeviceFactory {
- public:
-  // Creates an AudioRendererSink using the currently registered factory,
-  // or the default one if no factory is registered. Ownership of the returned
-  // pointer will be passed to the caller.
-  static media::AudioRendererSink* NewOutputDevice();
-
-  // TODO(henrika): Update AudioInputDevice to inherit from an interface
-  // similar to AudioRendererSink, but for input.  Same for the callback
-  // interfaces.
-  static media::AudioInputDevice* NewInputDevice();
-
- protected:
-  AudioDeviceFactory();
-  virtual ~AudioDeviceFactory();
-
-  // You can derive from this class and specify an implementation for these
-  // functions to provide alternate audio device implementations.
-  // If the return value of either of these function is NULL, we fall back
-  // on the default implementation.
-  virtual media::AudioRendererSink* CreateOutputDevice() = 0;
-  virtual media::AudioInputDevice* CreateInputDevice() = 0;
-
- private:
-  // The current globally registered factory. This is NULL when we should
-  // create the default AudioRendererSinks.
-  static AudioDeviceFactory* factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioDeviceFactory);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_FACTORY_H_