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// 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/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"
#if defined(OS_POSIX)
#include "base/file_descriptor_posix.h"
#endif
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);
virtual ~AudioSyncReader();
// media::AudioOutputController::SyncReader implementations.
virtual void UpdatePendingBytes(uint32 bytes) OVERRIDE;
virtual void Read(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();
const base::SharedMemory* const shared_memory_;
// Mutes all incoming samples. This is used to prevent audible sound
// during automated testing.
const 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_;
// Maximum amount of audio data which can be transferred in one Read() call.
const 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_
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