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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 MEDIA_AUDIO_ANDROID_OPENSLES_OUTPUT_H_
#define MEDIA_AUDIO_ANDROID_OPENSLES_OUTPUT_H_
#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>
#include "base/compiler_specific.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread_checker.h"
#include "media/audio/android/opensles_util.h"
#include "media/audio/audio_io.h"
#include "media/audio/audio_parameters.h"
namespace media {
class AudioManagerAndroid;
// Implements PCM audio output support for Android using the OpenSLES API.
// This class is created and lives on the Audio Manager thread but recorded
// audio buffers are given to us from an internal OpenSLES audio thread.
// All public methods should be called on the Audio Manager thread.
class OpenSLESOutputStream : public AudioOutputStream {
public:
static const int kMaxNumOfBuffersInQueue = 2;
OpenSLESOutputStream(AudioManagerAndroid* manager,
const AudioParameters& params,
SLint32 stream_type);
virtual ~OpenSLESOutputStream();
// Implementation of AudioOutputStream.
virtual bool Open() OVERRIDE;
virtual void Close() OVERRIDE;
virtual void Start(AudioSourceCallback* callback) OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void SetVolume(double volume) OVERRIDE;
virtual void GetVolume(double* volume) OVERRIDE;
// Set the value of |muted_|. It does not affect |volume_| which can be
// got by calling GetVolume(). See comments for |muted_| below.
void SetMute(bool muted);
private:
bool CreatePlayer();
// Called from OpenSLES specific audio worker thread.
static void SimpleBufferQueueCallback(
SLAndroidSimpleBufferQueueItf buffer_queue,
void* instance);
// Fills up one buffer by asking the registered source for data.
// Called from OpenSLES specific audio worker thread.
void FillBufferQueue();
// Called from the audio manager thread.
void FillBufferQueueNoLock();
// Called in Open();
void SetupAudioBuffer();
// Called in Close();
void ReleaseAudioBuffer();
// If OpenSLES reports an error this function handles it and passes it to
// the attached AudioOutputCallback::OnError().
void HandleError(SLresult error);
base::ThreadChecker thread_checker_;
// Protects |callback_|, |active_buffer_index_|, |audio_data_|,
// |buffer_size_bytes_| and |simple_buffer_queue_|.
base::Lock lock_;
AudioManagerAndroid* audio_manager_;
// Audio playback stream type.
// See SLES/OpenSLES_Android.h for details.
SLint32 stream_type_;
AudioSourceCallback* callback_;
// Shared engine interfaces for the app.
media::ScopedSLObjectItf engine_object_;
media::ScopedSLObjectItf player_object_;
media::ScopedSLObjectItf output_mixer_;
SLPlayItf player_;
// Buffer queue recorder interface.
SLAndroidSimpleBufferQueueItf simple_buffer_queue_;
SLDataFormat_PCM format_;
// Audio buffers that are allocated in the constructor based on
// info from audio parameters.
uint8* audio_data_[kMaxNumOfBuffersInQueue];
int active_buffer_index_;
size_t buffer_size_bytes_;
bool started_;
// Volume control coming from hardware. It overrides |volume_| when it's
// true. Otherwise, use |volume_| for scaling.
// This is needed because platform voice volume never goes to zero in
// COMMUNICATION mode on Android.
bool muted_;
// Volume level from 0 to 1.
float volume_;
// Container for retrieving data from AudioSourceCallback::OnMoreData().
scoped_ptr<AudioBus> audio_bus_;
DISALLOW_COPY_AND_ASSIGN(OpenSLESOutputStream);
};
} // namespace media
#endif // MEDIA_AUDIO_ANDROID_OPENSLES_OUTPUT_H_
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