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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_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_IMPL_H_
#define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_IMPL_H_
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "media/audio/audio_output_ipc.h"
namespace media {
class AudioParameters;
}
namespace base {
class MessageLoopProxy;
}
namespace content {
class AudioHelper;
class PepperPlatformAudioOutput
: public media::AudioOutputIPCDelegate,
public base::RefCountedThreadSafe<PepperPlatformAudioOutput> {
public:
// Factory function, returns NULL on failure. StreamCreated() will be called
// when the stream is created.
static PepperPlatformAudioOutput* Create(int sample_rate,
int frames_per_buffer,
int source_render_view_id,
AudioHelper* client);
// The following three methods are all called on main thread.
// Starts the playback. Returns false on error or if called before the
// stream is created or after the stream is closed.
bool StartPlayback();
// Stops the playback. Returns false on error or if called before the stream
// is created or after the stream is closed.
bool StopPlayback();
// Closes the stream. Make sure to call this before the object is
// destructed.
void ShutDown();
// media::AudioOutputIPCDelegate implementation.
virtual void OnStateChanged(
media::AudioOutputIPCDelegate::State state) OVERRIDE;
virtual void OnStreamCreated(base::SharedMemoryHandle handle,
base::SyncSocket::Handle socket_handle,
int length) OVERRIDE;
virtual void OnIPCClosed() OVERRIDE;
protected:
virtual ~PepperPlatformAudioOutput();
private:
friend class base::RefCountedThreadSafe<PepperPlatformAudioOutput>;
PepperPlatformAudioOutput();
bool Initialize(int sample_rate,
int frames_per_buffer,
int source_render_view_id,
AudioHelper* client);
// I/O thread backends to above functions.
void InitializeOnIOThread(const media::AudioParameters& params);
void StartPlaybackOnIOThread();
void StopPlaybackOnIOThread();
void ShutDownOnIOThread();
// The client to notify when the stream is created. THIS MUST ONLY BE
// ACCESSED ON THE MAIN THREAD.
AudioHelper* client_;
// Used to send/receive IPC. THIS MUST ONLY BE ACCESSED ON THE
// I/O thread except to send messages and get the message loop.
scoped_ptr<media::AudioOutputIPC> ipc_;
scoped_refptr<base::MessageLoopProxy> main_message_loop_proxy_;
scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
DISALLOW_COPY_AND_ASSIGN(PepperPlatformAudioOutput);
};
} // namespace content
#endif // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_IMPL_H_
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