| // 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_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_ |
| #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_ |
| |
| #include "base/file_descriptor_posix.h" |
| #include "base/process/process.h" |
| #include "base/sync_socket.h" |
| #include "base/synchronization/lock.h" |
| #include "base/time/time.h" |
| #include "media/audio/audio_output_controller.h" |
| #include "media/base/audio_bus.h" |
| |
| namespace base { |
| class SharedMemory; |
| } |
| |
| namespace content { |
| |
| // A AudioOutputController::SyncReader implementation using SyncSocket. This |
| // is used by AudioOutputController to provide a low latency data source for |
| // transmitting audio packets between the browser process and the renderer |
| // process. |
| class AudioSyncReader : public media::AudioOutputController::SyncReader { |
| public: |
| AudioSyncReader(base::SharedMemory* shared_memory, |
| const media::AudioParameters& params, |
| int input_channels); |
| |
| virtual ~AudioSyncReader(); |
| |
| // media::AudioOutputController::SyncReader implementations. |
| virtual void UpdatePendingBytes(uint32 bytes) OVERRIDE; |
| virtual void Read(const media::AudioBus* source, |
| media::AudioBus* dest) OVERRIDE; |
| virtual void Close() OVERRIDE; |
| |
| bool Init(); |
| bool PrepareForeignSocketHandle(base::ProcessHandle process_handle, |
| #if defined(OS_WIN) |
| base::SyncSocket::Handle* foreign_handle); |
| #else |
| base::FileDescriptor* foreign_handle); |
| #endif |
| |
| private: |
| // Blocks until data is ready for reading or a timeout expires. Returns false |
| // if an error or timeout occurs. |
| bool WaitUntilDataIsReady(); |
| |
| base::SharedMemory* shared_memory_; |
| |
| // Number of input channels for synchronized I/O. |
| int input_channels_; |
| |
| // Mutes all incoming samples. This is used to prevent audible sound |
| // during automated testing. |
| bool mute_audio_; |
| |
| // Socket for transmitting audio data. |
| scoped_ptr<base::CancelableSyncSocket> socket_; |
| |
| // Socket to be used by the renderer. The reference is released after |
| // PrepareForeignSocketHandle() is called and ran successfully. |
| scoped_ptr<base::CancelableSyncSocket> foreign_socket_; |
| |
| // Shared memory wrapper used for transferring audio data to Read() callers. |
| scoped_ptr<media::AudioBus> output_bus_; |
| |
| // Shared memory wrapper used for transferring audio data from Read() callers. |
| scoped_ptr<media::AudioBus> input_bus_; |
| |
| // Maximum amount of audio data which can be transferred in one Read() call. |
| int packet_size_; |
| |
| // Track the number of times the renderer missed its real-time deadline and |
| // report a UMA stat during destruction. |
| size_t renderer_callback_count_; |
| size_t renderer_missed_callback_count_; |
| |
| // The maximum amount of time to wait for data from the renderer. Calculated |
| // from the parameters given at construction. |
| const base::TimeDelta maximum_wait_time_; |
| |
| // The index of the audio buffer we're expecting to be sent from the renderer; |
| // used to block with timeout for audio data. |
| uint32 buffer_index_; |
| |
| DISALLOW_COPY_AND_ASSIGN(AudioSyncReader); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_ |