static int
opensl_get_min_latency(cubeb * ctx, cubeb_stream_params params, uint32_t * latency_ms)
{
/* https://android.googlesource.com/platform/ndk.git/+/master/docs/opensles/index.html
* We don't want to deal with JNI here (and we don't have Java on b2g anyways),
* so we just dlopen the library and get the two symbols we need. */
int rv;
void * libmedia;
size_t (*get_primary_output_frame_count)(void);
int (*get_output_frame_count)(size_t * frameCount, int streamType);
uint32_t primary_sampling_rate;
size_t primary_buffer_size;
rv = opensl_get_preferred_sample_rate(ctx, &primary_sampling_rate);
if (rv) {
return CUBEB_ERROR;
}
libmedia = dlopen("libmedia.so", RTLD_LAZY);
if (!libmedia) {
return CUBEB_ERROR;
}
/* JB variant */
/* size_t AudioSystem::getPrimaryOutputFrameCount(void) */
get_primary_output_frame_count =
dlsym(libmedia, "_ZN7android11AudioSystem26getPrimaryOutputFrameCountEv");
if (!get_primary_output_frame_count) {
/* ICS variant */
/* status_t AudioSystem::getOutputFrameCount(int* frameCount, int streamType) */
get_output_frame_count =
dlsym(libmedia, "_ZN7android11AudioSystem19getOutputFrameCountEPii");
if (!get_output_frame_count) {
dlclose(libmedia);
return CUBEB_ERROR;
}
}
if (get_primary_output_frame_count) {
primary_buffer_size = get_primary_output_frame_count();
} else {
if (get_output_frame_count(&primary_buffer_size, params.stream_type) != 0) {
return CUBEB_ERROR;
}
}
/* To get a fast track in Android's mixer, we need to be at the native
* samplerate, which is device dependant. Some devices might be able to
* resample when playing a fast track, but it's pretty rare. */
*latency_ms = NBUFS * primary_buffer_size / (primary_sampling_rate / 1000);
dlclose(libmedia);
return CUBEB_OK;
}
int
opensl_stream_get_latency(cubeb_stream * stm, uint32_t * latency)
{
int rv;
void * libmedia;
int32_t (*get_output_latency)(uint32_t * latency, int stream_type);
uint32_t mixer_latency;
uint32_t samplerate;
/* The latency returned by AudioFlinger is in ms, so we have to get
* AudioFlinger's samplerate to convert it to frames. */
rv = opensl_get_preferred_sample_rate(stm->context, &samplerate);
if (rv) {
return CUBEB_ERROR;
}
libmedia = dlopen("libmedia.so", RTLD_LAZY);
if (!libmedia) {
return CUBEB_ERROR;
}
/* Get the latency, in ms, from AudioFlinger */
/* status_t AudioSystem::getOutputLatency(uint32_t* latency,
* audio_stream_type_t streamType) */
/* First, try the most recent signature. */
get_output_latency =
dlsym(libmedia, "_ZN7android11AudioSystem16getOutputLatencyEPj19audio_stream_type_t");
if (!get_output_latency) {
/* in case of failure, try the legacy version. */
/* status_t AudioSystem::getOutputLatency(uint32_t* latency,
* int streamType) */
get_output_latency =
dlsym(libmedia, "_ZN7android11AudioSystem16getOutputLatencyEPji");
if (!get_output_latency) {
dlclose(libmedia);
return CUBEB_ERROR;
}
}
/* audio_stream_type_t is an int, so this is okay. */
rv = get_output_latency(&mixer_latency, stm->stream_type);
if (rv) {
dlclose(libmedia);
return CUBEB_ERROR;
}
*latency = NBUFS * stm->queuebuf_len / stm->framesize + // OpenSL latency
mixer_latency * samplerate / 1000; // AudioFlinger latency
dlclose(libmedia);
return CUBEB_OK;
}
static int
opensl_stream_init(cubeb * ctx, cubeb_stream ** stream, char const * stream_name,
cubeb_stream_params stream_params, unsigned int latency,
cubeb_data_callback data_callback, cubeb_state_callback state_callback,
void * user_ptr)
{
cubeb_stream * stm;
assert(ctx);
*stream = NULL;
if (stream_params.channels < 1 || stream_params.channels > 32 ||
latency < 1 || latency > 2000) {
return CUBEB_ERROR_INVALID_FORMAT;
}
SLDataFormat_PCM format;
format.formatType = SL_DATAFORMAT_PCM;
format.numChannels = stream_params.channels;
// samplesPerSec is in milliHertz
format.samplesPerSec = stream_params.rate * 1000;
format.bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_16;
format.containerSize = SL_PCMSAMPLEFORMAT_FIXED_16;
format.channelMask = stream_params.channels == 1 ?
SL_SPEAKER_FRONT_CENTER :
SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT;
switch (stream_params.format) {
case CUBEB_SAMPLE_S16LE:
format.endianness = SL_BYTEORDER_LITTLEENDIAN;
break;
case CUBEB_SAMPLE_S16BE:
format.endianness = SL_BYTEORDER_BIGENDIAN;
break;
default:
return CUBEB_ERROR_INVALID_FORMAT;
}
stm = calloc(1, sizeof(*stm));
assert(stm);
stm->context = ctx;
stm->data_callback = data_callback;
stm->state_callback = state_callback;
stm->user_ptr = user_ptr;
stm->inputrate = stream_params.rate;
stm->latency = latency;
stm->stream_type = stream_params.stream_type;
stm->framesize = stream_params.channels * sizeof(int16_t);
int r = pthread_mutex_init(&stm->mutex, NULL);
assert(r == 0);
SLDataLocator_BufferQueue loc_bufq;
loc_bufq.locatorType = SL_DATALOCATOR_BUFFERQUEUE;
loc_bufq.numBuffers = NBUFS;
SLDataSource source;
source.pLocator = &loc_bufq;
source.pFormat = &format;
SLDataLocator_OutputMix loc_outmix;
loc_outmix.locatorType = SL_DATALOCATOR_OUTPUTMIX;
loc_outmix.outputMix = ctx->outmixObj;
SLDataSink sink;
sink.pLocator = &loc_outmix;
sink.pFormat = NULL;
#if defined(__ANDROID__)
const SLInterfaceID ids[] = {ctx->SL_IID_BUFFERQUEUE,
ctx->SL_IID_VOLUME,
ctx->SL_IID_ANDROIDCONFIGURATION};
const SLboolean req[] = {SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE};
#else
const SLInterfaceID ids[] = {ctx->SL_IID_BUFFERQUEUE, ctx->SL_IID_VOLUME};
const SLboolean req[] = {SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE};
#endif
assert(NELEMS(ids) == NELEMS(req));
SLresult res = (*ctx->eng)->CreateAudioPlayer(ctx->eng, &stm->playerObj,
&source, &sink, NELEMS(ids), ids, req);
uint32_t preferred_sampling_rate = stm->inputrate;
// Sample rate not supported? Try again with primary sample rate!
if (res == SL_RESULT_CONTENT_UNSUPPORTED) {
if (opensl_get_preferred_sample_rate(ctx, &preferred_sampling_rate)) {
opensl_stream_destroy(stm);
return CUBEB_ERROR;
}
format.samplesPerSec = preferred_sampling_rate * 1000;
res = (*ctx->eng)->CreateAudioPlayer(ctx->eng, &stm->playerObj,
&source, &sink, NELEMS(ids), ids, req);
}
if (res != SL_RESULT_SUCCESS) {
opensl_stream_destroy(stm);
return CUBEB_ERROR;
}
stm->outputrate = preferred_sampling_rate;
stm->bytespersec = preferred_sampling_rate * stm->framesize;
stm->queuebuf_len = (stm->bytespersec * latency) / (1000 * NBUFS);
// round up to the next multiple of stm->framesize, if needed.
if (stm->queuebuf_len % stm->framesize) {
stm->queuebuf_len += stm->framesize - (stm->queuebuf_len % stm->framesize);
}
stm->resampler = cubeb_resampler_create(stm, stream_params,
preferred_sampling_rate,
data_callback,
stm->queuebuf_len / stm->framesize,
user_ptr,
CUBEB_RESAMPLER_QUALITY_DEFAULT);
if (!stm->resampler) {
opensl_stream_destroy(stm);
return CUBEB_ERROR;
}
int i;
for (i = 0; i < NBUFS; i++) {
stm->queuebuf[i] = malloc(stm->queuebuf_len);
assert(stm->queuebuf[i]);
}
#if defined(__ANDROID__)
SLuint32 stream_type = convert_stream_type_to_sl_stream(stream_params.stream_type);
if (stream_type != 0xFFFFFFFF) {
SLAndroidConfigurationItf playerConfig;
res = (*stm->playerObj)->GetInterface(stm->playerObj,
ctx->SL_IID_ANDROIDCONFIGURATION, &playerConfig);
res = (*playerConfig)->SetConfiguration(playerConfig,
SL_ANDROID_KEY_STREAM_TYPE, &stream_type, sizeof(SLint32));
if (res != SL_RESULT_SUCCESS) {
opensl_stream_destroy(stm);
return CUBEB_ERROR;
}
}
#endif
res = (*stm->playerObj)->Realize(stm->playerObj, SL_BOOLEAN_FALSE);
if (res != SL_RESULT_SUCCESS) {
opensl_stream_destroy(stm);
return CUBEB_ERROR;
}
res = (*stm->playerObj)->GetInterface(stm->playerObj, ctx->SL_IID_PLAY, &stm->play);
if (res != SL_RESULT_SUCCESS) {
opensl_stream_destroy(stm);
return CUBEB_ERROR;
}
res = (*stm->playerObj)->GetInterface(stm->playerObj, ctx->SL_IID_BUFFERQUEUE,
&stm->bufq);
if (res != SL_RESULT_SUCCESS) {
opensl_stream_destroy(stm);
return CUBEB_ERROR;
}
res = (*stm->playerObj)->GetInterface(stm->playerObj, ctx->SL_IID_VOLUME,
&stm->volume);
if (res != SL_RESULT_SUCCESS) {
opensl_stream_destroy(stm);
return CUBEB_ERROR;
}
res = (*stm->play)->RegisterCallback(stm->play, play_callback, stm);
if (res != SL_RESULT_SUCCESS) {
opensl_stream_destroy(stm);
return CUBEB_ERROR;
}
res = (*stm->play)->SetCallbackEventsMask(stm->play, (SLuint32)SL_PLAYEVENT_HEADATMARKER);
if (res != SL_RESULT_SUCCESS) {
opensl_stream_destroy(stm);
return CUBEB_ERROR;
}
res = (*stm->bufq)->RegisterCallback(stm->bufq, bufferqueue_callback, stm);
if (res != SL_RESULT_SUCCESS) {
opensl_stream_destroy(stm);
return CUBEB_ERROR;
}
*stream = stm;
return CUBEB_OK;
}
