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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 <vector>
#include "base/compiler_specific.h"
#include "media/audio/android/opensles_util.h"
#include "media/audio/audio_io.h"
#include "media/audio/audio_parameters.h"
#include <SLES/OpenSLES_Android.h>
namespace media {
class AudioManagerAndroid;
// Implements PCM audio output support for Android using the OpenSLES API.
class OpenSLESOutputStream : public AudioOutputStream {
public:
static const int kNumOfQueuesInBuffer = 2;
OpenSLESOutputStream(AudioManagerAndroid* manager,
const AudioParameters& params);
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;
private:
bool CreatePlayer();
static void SimpleBufferQueueCallback(
SLAndroidSimpleBufferQueueItf buffer_queue, void* instance);
void FillBufferQueue();
// 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);
AudioManagerAndroid* audio_manager_;
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 buffer arrays that are allocated in the constructor.
uint8* audio_data_[kNumOfQueuesInBuffer];
int active_queue_;
size_t buffer_size_bytes_;
bool started_;
// 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_INPUT_H_
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