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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.
#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>
#include <stdint.h>
#include <memory>
#include "base/compiler_specific.h"
#include "base/macros.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/base/audio_parameters.h"
namespace media {
class AudioBus;
class AudioManagerAndroid;
// Implements PCM audio input support for Android using the OpenSLES API.
// This class is created and lives on the Audio Manager thread but recorded
// audio buffers are delivered on an internal OpenSLES audio thread. All public
// methods should be called on the Audio Manager thread.
class OpenSLESInputStream : public AudioInputStream {
static const int kMaxNumOfBuffersInQueue = 2;
OpenSLESInputStream(AudioManagerAndroid* manager,
const AudioParameters& params);
~OpenSLESInputStream() override;
// Implementation of AudioInputStream.
bool Open() override;
void Start(AudioInputCallback* callback) override;
void Stop() override;
void Close() override;
double GetMaxVolume() override;
void SetVolume(double volume) override;
double GetVolume() override;
bool SetAutomaticGainControl(bool enabled) override;
bool GetAutomaticGainControl() override;
bool IsMuted() override;
bool CreateRecorder();
// Called from OpenSLES specific audio worker thread.
static void SimpleBufferQueueCallback(
SLAndroidSimpleBufferQueueItf buffer_queue,
void* instance);
// Called from OpenSLES specific audio worker thread.
void ReadBufferQueue();
// 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 AudioInputCallback::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_;
AudioInputCallback* callback_;
// Shared engine interfaces for the app.
media::ScopedSLObjectItf recorder_object_;
media::ScopedSLObjectItf engine_object_;
SLRecordItf recorder_;
// 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_t* audio_data_[kMaxNumOfBuffersInQueue];
int active_buffer_index_;
int buffer_size_bytes_;
bool started_;
base::TimeDelta hardware_delay_;
std::unique_ptr<media::AudioBus> audio_bus_;
} // namespace media