SDL_Aout *SDL_AoutAndroid_CreateForOpenSLES()
{
SDLTRACE("%s\n", __func__);
SDL_Aout *aout = SDL_Aout_CreateInternal(sizeof(SDL_Aout_Opaque));
if (!aout)
return NULL;
SDL_Aout_Opaque *opaque = aout->opaque;
opaque->wakeup_cond = SDL_CreateCond();
opaque->wakeup_mutex = SDL_CreateMutex();
int ret = 0;
SLObjectItf slObject = NULL;
ret = slCreateEngine(&slObject, 0, NULL, 0, NULL, NULL);
CHECK_OPENSL_ERROR(ret, "%s: slCreateEngine() failed", __func__);
opaque->slObject = slObject;
ret = (*slObject)->Realize(slObject, SL_BOOLEAN_FALSE);
CHECK_OPENSL_ERROR(ret, "%s: slObject->Realize() failed", __func__);
SLEngineItf slEngine = NULL;
ret = (*slObject)->GetInterface(slObject, SL_IID_ENGINE, &slEngine);
CHECK_OPENSL_ERROR(ret, "%s: slObject->GetInterface() failed", __func__);
opaque->slEngine = slEngine;
SLObjectItf slOutputMixObject = NULL;
const SLInterfaceID ids1[] = {SL_IID_VOLUME};
const SLboolean req1[] = {SL_BOOLEAN_FALSE};
ret = (*slEngine)->CreateOutputMix(slEngine, &slOutputMixObject, 1, ids1, req1);
CHECK_OPENSL_ERROR(ret, "%s: slEngine->CreateOutputMix() failed", __func__);
opaque->slOutputMixObject = slOutputMixObject;
ret = (*slOutputMixObject)->Realize(slOutputMixObject, SL_BOOLEAN_FALSE);
CHECK_OPENSL_ERROR(ret, "%s: slOutputMixObject->Realize() failed", __func__);
aout->free_l = aout_free_l;
aout->opaque_class = &g_opensles_class;
aout->open_audio = aout_open_audio;
aout->pause_audio = aout_pause_audio;
aout->flush_audio = aout_flush_audio;
aout->close_audio = aout_close_audio;
aout->set_volume = aout_set_volume;
aout->func_get_latency_seconds = aout_get_latency_seconds;
return aout;
fail:
aout_free_l(aout);
return NULL;
}
static int Open(dtaudio_output_t *aout) {
aout_sys_t *sys;
SLresult result;
dtaudio_para_t *para = &aout->para;
sys = (aout_sys_t *) malloc(sizeof(*sys));
if (unlikely(sys == NULL))
return -1;
sys->p_so_handle = dlopen("libOpenSLES.so", RTLD_NOW);
if (sys->p_so_handle == NULL) {
goto error;
}
sys->slCreateEnginePtr = dlsym(sys->p_so_handle, "slCreateEngine");
if (unlikely(sys->slCreateEnginePtr == NULL)) {
goto error;
}
#define OPENSL_DLSYM(dest, name) \
do { \
const SLInterfaceID *sym = dlsym(sys->p_so_handle, "SL_IID_"name); \
if (unlikely(sym == NULL)) \
{ \
goto error; \
} \
sys->dest = *sym; \
} while(0)
OPENSL_DLSYM(SL_IID_ANDROIDSIMPLEBUFFERQUEUE, "ANDROIDSIMPLEBUFFERQUEUE");
OPENSL_DLSYM(SL_IID_ENGINE, "ENGINE");
OPENSL_DLSYM(SL_IID_PLAY, "PLAY");
OPENSL_DLSYM(SL_IID_VOLUME, "VOLUME");
#undef OPENSL_DLSYM
// create engine
result = sys->slCreateEnginePtr(&sys->engineObject, 0, NULL, 0, NULL, NULL);
CHECK_OPENSL_ERROR("Failed to create engine");
// realize the engine in synchronous mode
result = Realize(sys->engineObject, SL_BOOLEAN_FALSE);
CHECK_OPENSL_ERROR("Failed to realize engine");
// get the engine interface, needed to create other objects
result = GetInterface(sys->engineObject, sys->SL_IID_ENGINE, &sys->engineEngine);
CHECK_OPENSL_ERROR("Failed to get the engine interface");
// create output mix, with environmental reverb specified as a non-required interface
const SLInterfaceID ids1[] = {sys->SL_IID_VOLUME};
const SLboolean req1[] = {SL_BOOLEAN_FALSE};
result = CreateOutputMix(sys->engineEngine, &sys->outputMixObject, 1, ids1, req1);
CHECK_OPENSL_ERROR("Failed to create output mix");
// realize the output mix in synchronous mode
result = Realize(sys->outputMixObject, SL_BOOLEAN_FALSE);
CHECK_OPENSL_ERROR("Failed to realize output mix");
dt_lock_init(&sys->lock, NULL);
if (buf_init(&sys->dbt, para->dst_samplerate * 4 / 10) < 0) // 100ms
return -1;
aout->ao_priv = (void *) sys;
return 0;
error:
if (sys->outputMixObject)
Destroy(sys->outputMixObject);
if (sys->engineObject)
Destroy(sys->engineObject);
if (sys->p_so_handle)
dlclose(sys->p_so_handle);
free(sys);
return -1;
}
static int Start(dtaudio_output_t *aout) {
SLresult result;
aout_sys_t *sys = (aout_sys_t *) aout->ao_priv;
dtaudio_para_t *para = &aout->para;
// configure audio source - this defines the number of samples you can enqueue.
SLDataLocator_AndroidSimpleBufferQueue loc_bufq = {
SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE,
OPENSLES_BUFFERS
};
int mask;
if (para->dst_channels > 1)
mask = SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT;
else
mask = SL_SPEAKER_FRONT_CENTER;
SLDataFormat_PCM format_pcm;
format_pcm.formatType = SL_DATAFORMAT_PCM;
format_pcm.numChannels = para->dst_channels;
//format_pcm.samplesPerSec = ((SLuint32) para->dst_samplerate * 1000) ;
format_pcm.samplesPerSec = ((SLuint32) convertSampleRate(para->dst_samplerate));
format_pcm.bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_16;
format_pcm.containerSize = SL_PCMSAMPLEFORMAT_FIXED_16;
format_pcm.channelMask = mask;
format_pcm.endianness = SL_BYTEORDER_LITTLEENDIAN;
SLDataSource audioSrc = {&loc_bufq, &format_pcm};
// configure audio sink
SLDataLocator_OutputMix loc_outmix = {
SL_DATALOCATOR_OUTPUTMIX,
sys->outputMixObject
};
SLDataSink audioSnk = {&loc_outmix, NULL};
//create audio player
const SLInterfaceID ids2[] = {sys->SL_IID_ANDROIDSIMPLEBUFFERQUEUE, sys->SL_IID_VOLUME};
static const SLboolean req2[] = {SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE};
result = CreateAudioPlayer(sys->engineEngine, &sys->playerObject, &audioSrc,
&audioSnk, sizeof(ids2) / sizeof(*ids2),
ids2, req2);
if (unlikely(result != SL_RESULT_SUCCESS)) { // error
return -1;
/* Try again with a more sensible samplerate */
#if 0
fmt->i_rate = 44100;
format_pcm.samplesPerSec = ((SLuint32) 44100 * 1000) ;
result = CreateAudioPlayer(sys->engineEngine, &sys->playerObject, &audioSrc,
&audioSnk, sizeof(ids2) / sizeof(*ids2),
ids2, req2);
#endif
}
CHECK_OPENSL_ERROR("Failed to create audio player");
result = Realize(sys->playerObject, SL_BOOLEAN_FALSE);
CHECK_OPENSL_ERROR("Failed to realize player object.");
result = GetInterface(sys->playerObject, sys->SL_IID_PLAY, &sys->playerPlay);
CHECK_OPENSL_ERROR("Failed to get player interface.");
result = GetInterface(sys->playerObject, sys->SL_IID_VOLUME, &sys->volumeItf);
CHECK_OPENSL_ERROR("failed to get volume interface.");
result = GetInterface(sys->playerObject, sys->SL_IID_ANDROIDSIMPLEBUFFERQUEUE,
&sys->playerBufferQueue);
CHECK_OPENSL_ERROR("Failed to get buff queue interface");
result = RegisterCallback(sys->playerBufferQueue, PlayedCallback,
(void *) aout);
CHECK_OPENSL_ERROR("Failed to register buff queue callback.");
// set the player's state to playing
result = SetPlayState(sys->playerPlay, SL_PLAYSTATE_PLAYING);
CHECK_OPENSL_ERROR("Failed to switch to playing state");
/* XXX: rounding shouldn't affect us at normal sampling rate */
sys->rate = para->dst_samplerate;
sys->samples_per_buf = OPENSLES_BUFLEN * para->dst_samplerate / 1000;
sys->buf = malloc(OPENSLES_BUFFERS * sys->samples_per_buf * bytesPerSample(aout));
if (!sys->buf)
goto error;
sys->started = 0;
sys->next_buf = 0;
sys->samples = 0;
SetPositionUpdatePeriod(sys->playerPlay, AOUT_MIN_PREPARE_TIME * 1000 / CLOCK_FREQ);
return 0;
error:
if (sys->playerObject) {
Destroy(sys->playerObject);
sys->playerObject = NULL;
}
return -1;
}
static int aout_open_audio(SDL_Aout *aout, const SDL_AudioSpec *desired, SDL_AudioSpec *obtained)
{
SDLTRACE("%s\n", __func__);
assert(desired);
SDLTRACE("aout_open_audio()\n");
SDL_Aout_Opaque *opaque = aout->opaque;
SLEngineItf slEngine = opaque->slEngine;
SLDataFormat_PCM *format_pcm = &opaque->format_pcm;
int ret = 0;
opaque->spec = *desired;
// config audio src
SLDataLocator_AndroidSimpleBufferQueue loc_bufq = {
SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE,
OPENSLES_BUFFERS
};
int native_sample_rate = audiotrack_get_native_output_sample_rate(NULL);
ALOGI("OpenSL-ES: native sample rate %d Hz\n", native_sample_rate);
CHECK_COND_ERROR((desired->format == AUDIO_S16SYS), "%s: not AUDIO_S16SYS", __func__);
CHECK_COND_ERROR((desired->channels == 2 || desired->channels == 1), "%s: not 1,2 channel", __func__);
CHECK_COND_ERROR((desired->freq >= 8000 && desired->freq <= 48000), "%s: unsupport freq %d Hz", __func__, desired->freq);
if (SDL_Android_GetApiLevel() < IJK_API_21_LOLLIPOP &&
native_sample_rate > 0 &&
desired->freq < native_sample_rate) {
// Don't try to play back a sample rate higher than the native one,
// since OpenSL ES will try to use the fast path, which AudioFlinger
// will reject (fast path can't do resampling), and will end up with
// too small buffers for the resampling. See http://b.android.com/59453
// for details. This bug is still present in 4.4. If it is fixed later
// this workaround could be made conditional.
//
// by VLC/android_opensles.c
ALOGW("OpenSL-ES: force resample %lu to native sample rate %d\n",
(unsigned long) format_pcm->samplesPerSec / 1000,
(int) native_sample_rate);
format_pcm->samplesPerSec = native_sample_rate * 1000;
}
format_pcm->formatType = SL_DATAFORMAT_PCM;
format_pcm->numChannels = desired->channels;
format_pcm->samplesPerSec = desired->freq * 1000; // milli Hz
// format_pcm->numChannels = 2;
// format_pcm->samplesPerSec = SL_SAMPLINGRATE_44_1;
format_pcm->bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_16;
format_pcm->containerSize = SL_PCMSAMPLEFORMAT_FIXED_16;
switch (desired->channels) {
case 2:
format_pcm->channelMask = SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT;
break;
case 1:
format_pcm->channelMask = SL_SPEAKER_FRONT_CENTER;
break;
default:
ALOGE("%s, invalid channel %d", __func__, desired->channels);
goto fail;
}
format_pcm->endianness = SL_BYTEORDER_LITTLEENDIAN;
SLDataSource audio_source = {&loc_bufq, format_pcm};
// config audio sink
SLDataLocator_OutputMix loc_outmix = {
SL_DATALOCATOR_OUTPUTMIX,
opaque->slOutputMixObject
};
SLDataSink audio_sink = {&loc_outmix, NULL};
SLObjectItf slPlayerObject = NULL;
const SLInterfaceID ids2[] = { SL_IID_ANDROIDSIMPLEBUFFERQUEUE, SL_IID_VOLUME, SL_IID_PLAY };
static const SLboolean req2[] = { SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE };
ret = (*slEngine)->CreateAudioPlayer(slEngine, &slPlayerObject, &audio_source,
&audio_sink, sizeof(ids2) / sizeof(*ids2),
ids2, req2);
CHECK_OPENSL_ERROR(ret, "%s: slEngine->CreateAudioPlayer() failed", __func__);
opaque->slPlayerObject = slPlayerObject;
ret = (*slPlayerObject)->Realize(slPlayerObject, SL_BOOLEAN_FALSE);
CHECK_OPENSL_ERROR(ret, "%s: slPlayerObject->Realize() failed", __func__);
ret = (*slPlayerObject)->GetInterface(slPlayerObject, SL_IID_PLAY, &opaque->slPlayItf);
CHECK_OPENSL_ERROR(ret, "%s: slPlayerObject->GetInterface(SL_IID_PLAY) failed", __func__);
ret = (*slPlayerObject)->GetInterface(slPlayerObject, SL_IID_VOLUME, &opaque->slVolumeItf);
CHECK_OPENSL_ERROR(ret, "%s: slPlayerObject->GetInterface(SL_IID_VOLUME) failed", __func__);
ret = (*slPlayerObject)->GetInterface(slPlayerObject, SL_IID_ANDROIDSIMPLEBUFFERQUEUE, &opaque->slBufferQueueItf);
CHECK_OPENSL_ERROR(ret, "%s: slPlayerObject->GetInterface(SL_IID_ANDROIDSIMPLEBUFFERQUEUE) failed", __func__);
ret = (*opaque->slBufferQueueItf)->RegisterCallback(opaque->slBufferQueueItf, aout_opensles_callback, (void*)aout);
CHECK_OPENSL_ERROR(ret, "%s: slBufferQueueItf->RegisterCallback() failed", __func__);
// set the player's state to playing
// ret = (*opaque->slPlayItf)->SetPlayState(opaque->slPlayItf, SL_PLAYSTATE_PLAYING);
// CHECK_OPENSL_ERROR(ret, "%s: slBufferQueueItf->slPlayItf() failed", __func__);
opaque->bytes_per_frame = format_pcm->numChannels * format_pcm->bitsPerSample / 8;
opaque->milli_per_buffer = OPENSLES_BUFLEN;
opaque->frames_per_buffer = opaque->milli_per_buffer * format_pcm->samplesPerSec / 1000000; // samplesPerSec is in milli
opaque->bytes_per_buffer = opaque->bytes_per_frame * opaque->frames_per_buffer;
opaque->buffer_capacity = OPENSLES_BUFFERS * opaque->bytes_per_buffer;
ALOGI("OpenSL-ES: bytes_per_frame = %d bytes\n", (int)opaque->bytes_per_frame);
ALOGI("OpenSL-ES: milli_per_buffer = %d ms\n", (int)opaque->milli_per_buffer);
ALOGI("OpenSL-ES: frame_per_buffer = %d frames\n", (int)opaque->frames_per_buffer);
ALOGI("OpenSL-ES: bytes_per_buffer = %d bytes\n", (int)opaque->bytes_per_buffer);
ALOGI("OpenSL-ES: buffer_capacity = %d bytes\n", (int)opaque->buffer_capacity);
opaque->buffer = malloc(opaque->buffer_capacity);
CHECK_COND_ERROR(opaque->buffer, "%s: failed to alloc buffer %d\n", __func__, (int)opaque->buffer_capacity);
// (*opaque->slPlayItf)->SetPositionUpdatePeriod(opaque->slPlayItf, 1000);
// enqueue empty buffer to start play
memset(opaque->buffer, 0, opaque->buffer_capacity);
for(int i = 0; i < OPENSLES_BUFFERS; ++i) {
ret = (*opaque->slBufferQueueItf)->Enqueue(opaque->slBufferQueueItf, opaque->buffer + i * opaque->bytes_per_buffer, opaque->bytes_per_buffer);
CHECK_OPENSL_ERROR(ret, "%s: slBufferQueueItf->Enqueue(000...) failed", __func__);
}
opaque->pause_on = 1;
opaque->abort_request = 0;
opaque->audio_tid = SDL_CreateThreadEx(&opaque->_audio_tid, aout_thread, aout, "ff_aout_opensles");
CHECK_COND_ERROR(opaque->audio_tid, "%s: failed to SDL_CreateThreadEx", __func__);
if (obtained) {
*obtained = *desired;
obtained->size = opaque->buffer_capacity;
obtained->freq = format_pcm->samplesPerSec / 1000;
}
return opaque->buffer_capacity;
fail:
aout_close_audio(aout);
return -1;
}
