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// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#ifdef ANDROID
#include <assert.h>
#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>
#include "AudioCommon/OpenSLESStream.h"
#include "Common/CommonTypes.h"
// engine interfaces
static SLObjectItf engineObject;
static SLEngineItf engineEngine;
static SLObjectItf outputMixObject;
// buffer queue player interfaces
static SLObjectItf bqPlayerObject = nullptr;
static SLPlayItf bqPlayerPlay;
static SLAndroidSimpleBufferQueueItf bqPlayerBufferQueue;
static SLMuteSoloItf bqPlayerMuteSolo;
static SLVolumeItf bqPlayerVolume;
static CMixer *g_mixer;
#define BUFFER_SIZE 512
#define BUFFER_SIZE_IN_SAMPLES (BUFFER_SIZE / 2)
// Double buffering.
static short buffer[2][BUFFER_SIZE];
static int curBuffer = 0;
static void bqPlayerCallback(SLAndroidSimpleBufferQueueItf bq, void *context)
{
assert(bq == bqPlayerBufferQueue);
assert(nullptr == context);
short *nextBuffer = buffer[curBuffer];
int nextSize = sizeof(buffer[0]);
SLresult result = (*bqPlayerBufferQueue)->Enqueue(bqPlayerBufferQueue, nextBuffer, nextSize);
// Comment from sample code:
// the most likely other result is SL_RESULT_BUFFER_INSUFFICIENT,
// which for this code example would indicate a programming error
_assert_msg_(AUDIO, SL_RESULT_SUCCESS == result, "Couldn't enqueue audio stream.");
curBuffer ^= 1; // Switch buffer
// Render to the fresh buffer
g_mixer->Mix(reinterpret_cast<short *>(buffer[curBuffer]), BUFFER_SIZE_IN_SAMPLES);
}
bool OpenSLESStream::Start()
{
SLresult result;
// create engine
result = slCreateEngine(&engineObject, 0, nullptr, 0, nullptr, nullptr);
assert(SL_RESULT_SUCCESS == result);
result = (*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
assert(SL_RESULT_SUCCESS == result);
result = (*engineObject)->GetInterface(engineObject, SL_IID_ENGINE, &engineEngine);
assert(SL_RESULT_SUCCESS == result);
result = (*engineEngine)->CreateOutputMix(engineEngine, &outputMixObject, 0, 0, 0);
assert(SL_RESULT_SUCCESS == result);
result = (*outputMixObject)->Realize(outputMixObject, SL_BOOLEAN_FALSE);
assert(SL_RESULT_SUCCESS == result);
SLDataLocator_AndroidSimpleBufferQueue loc_bufq = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, 2};
SLDataFormat_PCM format_pcm = {
SL_DATAFORMAT_PCM,
2,
m_mixer->GetSampleRate() * 1000,
SL_PCMSAMPLEFORMAT_FIXED_16,
SL_PCMSAMPLEFORMAT_FIXED_16,
SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT,
SL_BYTEORDER_LITTLEENDIAN
};
SLDataSource audioSrc = {&loc_bufq, &format_pcm};
// configure audio sink
SLDataLocator_OutputMix loc_outmix = {SL_DATALOCATOR_OUTPUTMIX, outputMixObject};
SLDataSink audioSnk = {&loc_outmix, nullptr};
// create audio player
const SLInterfaceID ids[2] = {SL_IID_BUFFERQUEUE, SL_IID_VOLUME};
const SLboolean req[2] = {SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE};
result = (*engineEngine)->CreateAudioPlayer(engineEngine, &bqPlayerObject, &audioSrc, &audioSnk, 2, ids, req);
assert(SL_RESULT_SUCCESS == result);
result = (*bqPlayerObject)->Realize(bqPlayerObject, SL_BOOLEAN_FALSE);
assert(SL_RESULT_SUCCESS == result);
result = (*bqPlayerObject)->GetInterface(bqPlayerObject, SL_IID_PLAY, &bqPlayerPlay);
assert(SL_RESULT_SUCCESS == result);
result = (*bqPlayerObject)->GetInterface(bqPlayerObject, SL_IID_BUFFERQUEUE,
&bqPlayerBufferQueue);
assert(SL_RESULT_SUCCESS == result);
result = (*bqPlayerBufferQueue)->RegisterCallback(bqPlayerBufferQueue, bqPlayerCallback, nullptr);
assert(SL_RESULT_SUCCESS == result);
result = (*bqPlayerPlay)->SetPlayState(bqPlayerPlay, SL_PLAYSTATE_PLAYING);
assert(SL_RESULT_SUCCESS == result);
// Render and enqueue a first buffer.
curBuffer ^= 1;
g_mixer = m_mixer.get();
result = (*bqPlayerBufferQueue)->Enqueue(bqPlayerBufferQueue, buffer[0], sizeof(buffer[0]));
if (SL_RESULT_SUCCESS != result)
return false;
return true;
}
void OpenSLESStream::Stop()
{
if (bqPlayerObject != nullptr)
{
(*bqPlayerObject)->Destroy(bqPlayerObject);
bqPlayerObject = nullptr;
bqPlayerPlay = nullptr;
bqPlayerBufferQueue = nullptr;
bqPlayerMuteSolo = nullptr;
bqPlayerVolume = nullptr;
}
if (outputMixObject != nullptr)
{
(*outputMixObject)->Destroy(outputMixObject);
outputMixObject = nullptr;
}
if (engineObject != nullptr)
{
(*engineObject)->Destroy(engineObject);
engineObject = nullptr;
engineEngine = nullptr;
}
}
#endif
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