static void sco_close_output_stream(struct audio_hw_device *dev,
struct audio_stream_out *stream_out)
{
struct sco_dev *sco_dev = (struct sco_dev *) dev;
struct sco_stream_out *out = (struct sco_stream_out *) stream_out;
DBG("dev %p stream %p fd %d", dev, stream_out, sco_dev->out->fd);
if (sco_dev->out && sco_dev->out->fd) {
close(sco_dev->out->fd);
sco_dev->out->fd = -1;
}
if (out->resampler)
release_resampler(out->resampler);
free(out->downmix_buf);
free(out);
sco_dev->out = NULL;
}
//This is the rx samples forwarding thread (private)
void *usrp_rx_forwarder_thread (void *param)
{
RECEIVER *pRec = (RECEIVER *)param;
int old_state, old_type;
//debug
//std::cerr << inspect_receiver(pRec) << std::endl;
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE,&old_state);
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS,&old_type);
RECEIVER_CYCLE = true;
pRec->samples = 0;
std::vector<std::complex<float> > *buff;
QUEUE_BUFFER_ENTRY *item;
//NEW RES LIB
int resampler_id = resampler_setup_new(MAX_USRP_RX_BUFFER, DECIM_RX, INTERP_RX);
if (resampler_id < 0) { //FAILURE!
std::cerr << "RX Resampler object definition failed. Exiting..." << std::endl;
exit (1);
}
std::cerr << boost::format("RX thread Using resampler %d.") % resampler_id << std::endl;
std::cerr << "Starting the RX Data forwarding thread cycle" << std::endl;
while(1) {
pthread_mutex_lock(&RECEIVER_CYCLE_lock);
bool do_cycle = RECEIVER_CYCLE;
pthread_mutex_unlock(&RECEIVER_CYCLE_lock);
if (! do_cycle) break;
//Extract from queue
//If there is Vector buffer in the queue
pthread_mutex_lock(&rx_queue_lock);
item = TAILQ_FIRST(&rx_samples_iq_stream);
if (item != NULL) {
//Take next Vector buffer from the queue
buff = (std::vector<std::complex<float> > *)item->data;
TAILQ_REMOVE(&rx_samples_iq_stream, item, entries);
rx_queue_length--;
pthread_mutex_unlock(&rx_queue_lock);
} else {
pthread_mutex_unlock(&rx_queue_lock);
usleep(QUEUE_WAIT_TIME);
continue;
}
//RX path is disabled: skip the rest
if (drop_rx_samples) {
//Vector cleanup
delete buff;
free(item);
continue;
}
size_t num_rx_samps = buff->size();
//Rational resampling is applied at this point
//Interleaving real/imag in the resampler buffer
if (real_position == 1) {
unsigned int i;
#pragma omp parallel for schedule(static) private(i)
for (i=0; i<num_rx_samps; ++i)
resampler_load_data(resampler_id, i, (*buff)[i].imag(), (*buff)[i].real());
} else {
unsigned int i;
#pragma omp parallel for schedule(static) private(i)
for (i=0; i<num_rx_samps; ++i)
resampler_load_data(resampler_id, i, (*buff)[i].real(), (*buff)[i].imag());
}
//Vector cleanup
delete buff;
free(item);
//Rational resampling API here
char *rr_msg = NULL;
int output_frames_gen = 0;
int rr_retcode = do_resample(resampler_id, num_rx_samps, &output_frames_gen, rr_msg);
//std::cerr << boost::format("output_frames_gen %d.") % output_frames_gen << std::endl;
//TIME BECHMARKING
//gettimeofday(tod1, NULL);
//std::cerr << boost::format("After resampler: %d |") % (tod1->tv_usec - tod->tv_usec);
if (rr_retcode == RRESAMPLER_NO_ERROR) {
//Fetch resampled data into the Receiver input buffer
for (int j=0; j<output_frames_gen ; ++j) {
resampler_fetch_data(resampler_id, j, &pRec->input_buffer[pRec->samples],
&pRec->input_buffer[pRec->samples+RECEIVE_BUFFER_SIZE]);
pRec->samples++;
if(pRec->samples==RECEIVE_BUFFER_SIZE) {
//send I/Q data to client
//std::cerr << boost::format("%s: sending data.") % __FUNCTION__ << std::endl;
send_IQ_buffer(pRec);
pRec->samples=0;
}
}
} else {
//A rational resampler error occurred!
std::cerr << boost::format("RX Rational resampling error: %s") % rr_msg << std::endl;
}
}
release_resampler(resampler_id);
fprintf(stderr,"Exiting from USRP RX Forwarder thread\n");
return NULL;
}
static int sco_open_output_stream(struct audio_hw_device *dev,
audio_io_handle_t handle,
audio_devices_t devices,
audio_output_flags_t flags,
struct audio_config *config,
struct audio_stream_out **stream_out)
{
struct sco_dev *adev = (struct sco_dev *) dev;
struct sco_stream_out *out;
int fd = -1;
int chan_num, ret;
size_t resample_size;
uint16_t mtu;
DBG("");
if (ipc_connect_sco(&fd, &mtu) != SCO_STATUS_SUCCESS) {
error("sco: cannot get fd");
return -EIO;
}
DBG("got sco fd %d mtu %u", fd, mtu);
out = calloc(1, sizeof(struct sco_stream_out));
if (!out)
return -ENOMEM;
out->stream.common.get_sample_rate = out_get_sample_rate;
out->stream.common.set_sample_rate = out_set_sample_rate;
out->stream.common.get_buffer_size = out_get_buffer_size;
out->stream.common.get_channels = out_get_channels;
out->stream.common.get_format = out_get_format;
out->stream.common.set_format = out_set_format;
out->stream.common.standby = out_standby;
out->stream.common.dump = out_dump;
out->stream.common.set_parameters = out_set_parameters;
out->stream.common.get_parameters = out_get_parameters;
out->stream.common.add_audio_effect = out_add_audio_effect;
out->stream.common.remove_audio_effect = out_remove_audio_effect;
out->stream.get_latency = out_get_latency;
out->stream.set_volume = out_set_volume;
out->stream.write = out_write;
out->stream.get_render_position = out_get_render_position;
/* Configuration for Android */
out->cfg.format = AUDIO_STREAM_DEFAULT_FORMAT;
out->cfg.channels = AUDIO_CHANNEL_OUT_STEREO;
out->cfg.rate = AUDIO_STREAM_DEFAULT_RATE;
out->cfg.frame_num = OUT_STREAM_FRAMES;
out->cfg.mtu = mtu;
out->downmix_buf = malloc(out_get_buffer_size(&out->stream.common));
if (!out->downmix_buf) {
free(out);
return -ENOMEM;
}
DBG("size %zd", out_get_buffer_size(&out->stream.common));
/* Channel numbers for resampler */
chan_num = 1;
ret = create_resampler(out->cfg.rate, AUDIO_STREAM_SCO_RATE, chan_num,
RESAMPLER_QUALITY_DEFAULT, NULL,
&out->resampler);
if (ret) {
error("Failed to create resampler (%s)", strerror(ret));
goto failed;
}
DBG("Created resampler: input rate [%d] output rate [%d] channels [%d]",
out->cfg.rate, AUDIO_STREAM_SCO_RATE, chan_num);
out->resample_frame_num = get_resample_frame_num(AUDIO_STREAM_SCO_RATE,
out->cfg.rate,
out->cfg.frame_num, 1);
if (!out->resample_frame_num) {
error("frame num is too small to resample, discard it");
goto failed;
}
resample_size = sizeof(int16_t) * chan_num * out->resample_frame_num;
out->resample_buf = malloc(resample_size);
if (!out->resample_buf) {
error("failed to allocate resample buffer for %u frames",
out->resample_frame_num);
goto failed;
}
DBG("resampler: frame num %u buf size %zd bytes",
out->resample_frame_num, resample_size);
*stream_out = &out->stream;
adev->out = out;
out->fd = fd;
return 0;
failed:
if (out->resampler)
release_resampler(out->resampler);
free(out->downmix_buf);
free(out);
stream_out = NULL;
adev->out = NULL;
return ret;
}