static GstFlowReturn
gst_fluid_dec_chain (GstPad * sinkpad, GstObject * parent, GstBuffer * buffer)
{
GstFlowReturn res = GST_FLOW_OK;
GstFluidDec *fluiddec;
GstClockTime pts;
fluiddec = GST_FLUID_DEC (parent);
if (GST_BUFFER_IS_DISCONT (buffer)) {
fluiddec->discont = TRUE;
}
pts = GST_BUFFER_PTS (buffer);
if (pts != GST_CLOCK_TIME_NONE) {
guint64 sample =
gst_util_uint64_scale_int (pts, FLUID_DEC_RATE, GST_SECOND);
if (fluiddec->last_pts == GST_CLOCK_TIME_NONE) {
fluiddec->last_pts = pts;
fluiddec->last_sample = sample;
} else if (fluiddec->last_pts < pts) {
/* generate samples for the elapsed time */
res = produce_samples (fluiddec, pts, sample);
}
}
if (res == GST_FLOW_OK) {
handle_buffer (fluiddec, buffer);
}
gst_buffer_unref (buffer);
return res;
}
/** [tx_meta_now] */
int sync_tx_meta_now_example(struct bladerf *dev, int16_t *samples,
unsigned int num_samples, unsigned int tx_count,
unsigned int timeout_ms)
{
int status = 0;
struct bladerf_metadata meta;
unsigned int i;
memset(&meta, 0, sizeof(meta));
/* Send entire burst worth of samples in one function call */
meta.flags = BLADERF_META_FLAG_TX_BURST_START |
BLADERF_META_FLAG_TX_NOW |
BLADERF_META_FLAG_TX_BURST_END;
for (i = 0; i < tx_count && status == 0; i++) {
/* Fetch or produce IQ samples...*/
produce_samples(samples, num_samples);
status = bladerf_sync_tx(dev, samples, num_samples, &meta, timeout_ms);
if (status != 0) {
fprintf(stderr, "TX failed: %s\n", bladerf_strerror(status));
} else {
uint64_t curr_ts;
status = bladerf_get_timestamp(dev, BLADERF_MODULE_TX, &curr_ts);
if (status != 0) {
fprintf(stderr, "Failed to get current TX timestamp: %s\n",
bladerf_strerror(status));
} else {
printf("TX'd at approximately t=%016"PRIu64"\n", curr_ts);
}
/* Delay next transmission by approximately 5 ms
*
* This is a very imprecise, "quick and dirty" means to do so in
* cases where no particular intra-burst time is required. */
usleep(5000);
}
}
/* Wait for samples to be TX'd before completing. */
if (status == 0) {
status = bladerf_get_timestamp(dev, BLADERF_MODULE_TX, &meta.timestamp);
if (status != 0) {
fprintf(stderr, "Failed to get current TX timestamp: %s\n",
bladerf_strerror(status));
return status;
} else {
status = wait_for_timestamp(dev, BLADERF_MODULE_TX,
meta.timestamp + 2 * num_samples,
timeout_ms);
if (status != 0) {
fprintf(stderr, "Failed to wait for timestamp.\n");
}
}
}
return status;
}
/** [tx_meta_sched] */
int sync_tx_meta_sched_example(struct bladerf *dev,
int16_t *samples, unsigned int num_samples,
unsigned int tx_count, unsigned int samplerate,
unsigned int timeout_ms)
{
int status = 0;
unsigned int i;
struct bladerf_metadata meta;
memset(&meta, 0, sizeof(meta));
/* Send entire burst worth of samples in one function call */
meta.flags = BLADERF_META_FLAG_TX_BURST_START |
BLADERF_META_FLAG_TX_BURST_END;
/* Retrieve the current timestamp so we can schedule our transmission
* in the future. */
status = bladerf_get_timestamp(dev, BLADERF_MODULE_TX, &meta.timestamp);
if (status != 0) {
fprintf(stderr, "Failed to get current TX timestamp: %s\n",
bladerf_strerror(status));
return status;
} else {
printf("Current TX timestamp: %016"PRIu64"\n", meta.timestamp);
}
for (i = 0; i < tx_count && status == 0; i++) {
/* Get sample to transmit... */
produce_samples(samples, num_samples);
/* Schedule burst 5 ms into the future */
meta.timestamp += samplerate / 200;
status = bladerf_sync_tx(dev, samples, num_samples, &meta, timeout_ms);
if (status != 0) {
fprintf(stderr, "TX failed: %s\n", bladerf_strerror(status));
return status;
} else {
printf("TX'd @ t=%016"PRIu64"\n", meta.timestamp);
}
}
/* Wait for samples to finish being transmitted. */
if (status == 0) {
meta.timestamp += 2 * num_samples;
status = wait_for_timestamp(dev, BLADERF_MODULE_TX,
meta.timestamp, timeout_ms);
if (status != 0) {
fprintf(stderr, "Failed to wait for timestamp.\n");
}
}
return status;
}
/** [tx_meta_update] */
int sync_tx_meta_update_example(struct bladerf *dev,
int16_t *samples, unsigned int num_samples,
unsigned int tx_count, unsigned int samplerate,
unsigned int timeout_ms)
{
int status = 0;
unsigned int i;
struct bladerf_metadata meta;
int16_t zeros[] = { 0, 0, 0, 0 }; /* Two 0+0j samples */
memset(&meta, 0, sizeof(meta));
/* The first call to bladerf_sync_tx() will start our long "burst" at
* a specific timestamp.
*
* In successive calls, we'll break this long "burst" up into shorter bursts
* by using the BLADERF_META_FLAG_TX_UPDATE_TIMESTAMP flag with new
* timestamps. The discontinuities will be zero-padded.
*/
meta.flags = BLADERF_META_FLAG_TX_BURST_START;
/* Retrieve the current timestamp so we can schedule our transmission
* in the future. */
status = bladerf_get_timestamp(dev, BLADERF_MODULE_TX, &meta.timestamp);
if (status != 0) {
fprintf(stderr, "Failed to get current TX timestamp: %s\n",
bladerf_strerror(status));
return status;
} else {
printf("Current TX timestamp: %016"PRIu64"\n", meta.timestamp);
}
/* Start 5 ms in the future */
meta.timestamp += samplerate / 200;
for (i = 0; i < tx_count && status == 0; i++) {
/* Get sample to transmit... */
produce_samples(samples, num_samples);
status = bladerf_sync_tx(dev, samples, num_samples, &meta, timeout_ms);
if (status != 0) {
fprintf(stderr, "TX failed: %s\n", bladerf_strerror(status));
return status;
} else {
printf("TX'd @ t=%016"PRIu64"\n", meta.timestamp);
}
/* Instruct bladerf_sync_tx() to position samples within this burst at
* the specified timestamp. 0+0j will be transmitted up until that
* point. */
meta.flags = BLADERF_META_FLAG_TX_UPDATE_TIMESTAMP;
/* Schedule samples to be transmitted 1.25 ms after the completion of
* the previous burst */
meta.timestamp += num_samples + samplerate / 800;
}
/* End the burst and flush remaining samples. */
meta.flags = BLADERF_META_FLAG_TX_BURST_END;
status = bladerf_sync_tx(dev, zeros, 2, &meta, timeout_ms);
/* Wait for samples to finish being transmitted. */
if (status == 0) {
meta.timestamp += 2 * num_samples;
status = wait_for_timestamp(dev, BLADERF_MODULE_TX,
meta.timestamp, timeout_ms);
if (status != 0) {
fprintf(stderr, "Failed to wait for timestamp.\n");
}
} else {
fprintf(stderr, "Failed to complete burst: %s\n",
bladerf_strerror(status));
}
return status;
}
