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// Copyright (c) 2011 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_
#pragma once
#include "base/file_descriptor_posix.h"
#include "base/process.h"
#include "base/sync_socket.h"
#include "base/synchronization/lock.h"
#include "base/time.h"
#include "media/audio/audio_output_controller.h"
namespace base {
class SharedMemory;
}
// 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:
explicit AudioSyncReader(base::SharedMemory* shared_memory);
virtual ~AudioSyncReader();
// media::AudioOutputController::SyncReader implementations.
virtual void UpdatePendingBytes(uint32 bytes) OVERRIDE;
virtual uint32 Read(void* data, uint32 size) OVERRIDE;
virtual void Close() OVERRIDE;
virtual bool DataReady() 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:
base::SharedMemory* shared_memory_;
base::Time previous_call_time_;
// A pair of SyncSocket for transmitting audio data.
scoped_ptr<base::SyncSocket> socket_;
// SyncSocket to be used by the renderer. The reference is released after
// PrepareForeignSocketHandle() is called and ran successfully.
scoped_ptr<base::SyncSocket> foreign_socket_;
// Protect socket_ access by lock to prevent race condition when audio
// controller thread closes the reader and hardware audio thread is reading
// data. This way we know that socket would not be deleted while we are
// writing data to it.
base::Lock lock_;
DISALLOW_COPY_AND_ASSIGN(AudioSyncReader);
};
#endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_SYNC_READER_H_
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