static GstClockTime
gst_alsasrc_get_timestamp (GstAlsaSrc * asrc)
{
snd_pcm_status_t *status;
snd_htimestamp_t tstamp;
GstClockTime timestamp;
snd_pcm_uframes_t avail;
gint err = -EPIPE;
if (G_UNLIKELY (!asrc)) {
GST_ERROR_OBJECT (asrc, "No alsa handle created yet !");
return GST_CLOCK_TIME_NONE;
}
if (G_UNLIKELY (snd_pcm_status_malloc (&status) != 0)) {
GST_ERROR_OBJECT (asrc, "snd_pcm_status_malloc failed");
return GST_CLOCK_TIME_NONE;
}
if (G_UNLIKELY (snd_pcm_status (asrc->handle, status) != 0)) {
GST_ERROR_OBJECT (asrc, "snd_pcm_status failed");
return GST_CLOCK_TIME_NONE;
}
/* in case an xrun condition has occured we need to handle this */
if (snd_pcm_status_get_state (status) != SND_PCM_STATE_RUNNING) {
if (xrun_recovery (asrc, asrc->handle, err) < 0) {
GST_WARNING_OBJECT (asrc, "Could not recover from xrun condition !");
}
/* reload the status alsa status object, since recovery made it invalid */
if (G_UNLIKELY (snd_pcm_status (asrc->handle, status) != 0)) {
GST_ERROR_OBJECT (asrc, "snd_pcm_status failed");
}
}
/* get high resolution time stamp from driver */
snd_pcm_status_get_htstamp (status, &tstamp);
timestamp = GST_TIMESPEC_TO_TIME (tstamp);
/* max available frames sets the depth of the buffer */
avail = snd_pcm_status_get_avail (status);
/* calculate the timestamp of the next sample to be read */
timestamp -= gst_util_uint64_scale_int (avail, GST_SECOND, asrc->rate);
/* compensate for the fact that we really need the timestamp of the
* previously read data segment */
timestamp -= asrc->period_time * 1000;
snd_pcm_status_free (status);
GST_LOG_OBJECT (asrc, "ALSA timestamp : %" GST_TIME_FORMAT
", delay %lu", GST_TIME_ARGS (timestamp), avail);
return timestamp;
}
static void
alsa_prefill( void )
{
snd_pcm_status_t *status;
char buf[512];
int frames, cnt;
snd_pcm_status_malloc( &status );
snd_pcm_status( alsa.pcm, status );
frames = snd_pcm_status_get_avail(status);
snd_pcm_status_free( status );
memset( buf, 0, sizeof(buf) );
cnt = sizeof(buf)/alsa.bpf;
for( ; frames > 0; frames -= cnt ) {
if( cnt > frames )
cnt = frames;
snd_pcm_writei( alsa.pcm, buf, sizeof(buf)/alsa.bpf );
}
}
void DAUDIO_Close(void* id, int isSource) {
AlsaPcmInfo* info = (AlsaPcmInfo*) id;
TRACE0("DAUDIO_Close\n");
if (info != NULL) {
if (info->handle != NULL) {
snd_pcm_close(info->handle);
}
if (info->hwParams) {
snd_pcm_hw_params_free(info->hwParams);
}
if (info->swParams) {
snd_pcm_sw_params_free(info->swParams);
}
#ifdef GET_POSITION_METHOD2
if (info->positionStatus) {
snd_pcm_status_free(info->positionStatus);
}
#endif
free(info);
}
}
