| // 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_MESSAGE_FILTER_H_ |
| #define CONTENT_RENDERER_MEDIA_AUDIO_MESSAGE_FILTER_H_ |
| |
| #include "base/gtest_prod_util.h" |
| #include "base/id_map.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/memory/shared_memory.h" |
| #include "base/sync_socket.h" |
| #include "base/synchronization/lock.h" |
| #include "content/common/content_export.h" |
| #include "ipc/message_filter.h" |
| #include "media/audio/audio_output_ipc.h" |
| #include "media/base/audio_hardware_config.h" |
| |
| namespace base { |
| class SingleThreadTaskRunner; |
| } |
| |
| namespace content { |
| |
| // MessageFilter that handles audio messages and delegates them to audio |
| // renderers. Created on render thread, AudioMessageFilter is operated on |
| // 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::MessageFilter { |
| public: |
| explicit AudioMessageFilter( |
| scoped_refptr<base::SingleThreadTaskRunner> io_task_runner); |
| |
| // Getter for the one AudioMessageFilter object. |
| static AudioMessageFilter* Get(); |
| |
| // Create an AudioOutputIPC to be owned by one delegate. |render_frame_id| is |
| // the RenderFrame containing the entity producing the audio. |
| // |
| // The returned object is not thread-safe, and must be used on |
| // |io_task_runner|. |
| scoped_ptr<media::AudioOutputIPC> CreateAudioOutputIPC(int render_frame_id); |
| |
| // IO task runner associated with this message filter. |
| base::SingleThreadTaskRunner* io_task_runner() const { |
| return io_task_runner_.get(); |
| } |
| |
| protected: |
| ~AudioMessageFilter() override; |
| |
| private: |
| 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_frame_id. |
| class AudioOutputIPCImpl; |
| |
| // Sends an IPC message using |sender_|. |
| void Send(IPC::Message* message); |
| |
| // IPC::MessageFilter override. Called on |io_task_runner_|. |
| bool OnMessageReceived(const IPC::Message& message) override; |
| void OnFilterAdded(IPC::Sender* sender) override; |
| void OnFilterRemoved() override; |
| void OnChannelClosing() override; |
| |
| // Received when browser process has created an audio output stream. |
| void OnStreamCreated(int stream_id, base::SharedMemoryHandle handle, |
| base::SyncSocket::TransitDescriptor socket_descriptor, |
| uint32 length); |
| |
| // Received when internal state of browser process' audio output device has |
| // changed. |
| void OnStreamStateChanged(int stream_id, |
| media::AudioOutputIPCDelegateState state); |
| |
| // Received when the browser process has finished processing a |
| // SwitchOutputDevice request |
| void OnOutputDeviceSwitched(int stream_id, |
| int request_id, |
| media::SwitchOutputDeviceResult result); |
| |
| // IPC sender for Send(); must only be accesed on |io_task_runner_|. |
| IPC::Sender* sender_; |
| |
| // A map of stream ids to delegates; must only be accessed on |
| // |io_task_runner_|. |
| IDMap<media::AudioOutputIPCDelegate> delegates_; |
| |
| // Task runner on which IPC calls are executed. |
| const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_; |
| |
| // The singleton instance for this filter. |
| static AudioMessageFilter* g_filter; |
| |
| DISALLOW_COPY_AND_ASSIGN(AudioMessageFilter); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_RENDERER_MEDIA_AUDIO_MESSAGE_FILTER_H_ |