static int snd_pcm_dshare_drop(snd_pcm_t *pcm)
{
snd_pcm_direct_t *dshare = pcm->private_data;
if (dshare->state == SND_PCM_STATE_OPEN)
return -EBADFD;
snd_pcm_direct_timer_stop(dshare);
do_silence(pcm);
dshare->state = SND_PCM_STATE_SETUP;
return 0;
}
/*
* synchronize hardware pointer (hw_ptr) with ours
*/
static int snd_pcm_dshare_sync_ptr0(snd_pcm_t *pcm, snd_pcm_uframes_t slave_hw_ptr)
{
snd_pcm_direct_t *dshare = pcm->private_data;
snd_pcm_uframes_t old_slave_hw_ptr, avail;
snd_pcm_sframes_t diff;
old_slave_hw_ptr = dshare->slave_hw_ptr;
dshare->slave_hw_ptr = slave_hw_ptr;
diff = slave_hw_ptr - old_slave_hw_ptr;
if (diff == 0) /* fast path */
return 0;
if (dshare->state != SND_PCM_STATE_RUNNING &&
dshare->state != SND_PCM_STATE_DRAINING)
/* not really started yet - don't update hw_ptr */
return 0;
if (diff < 0) {
slave_hw_ptr += dshare->slave_boundary;
diff = slave_hw_ptr - old_slave_hw_ptr;
}
dshare->hw_ptr += diff;
dshare->hw_ptr %= pcm->boundary;
// printf("sync ptr diff = %li\n", diff);
if (pcm->stop_threshold >= pcm->boundary) /* don't care */
return 0;
avail = snd_pcm_mmap_playback_avail(pcm);
if (avail > dshare->avail_max)
dshare->avail_max = avail;
if (avail >= pcm->stop_threshold) {
snd_timer_stop(dshare->timer);
do_silence(pcm);
gettimestamp(&dshare->trigger_tstamp, pcm->tstamp_type);
if (dshare->state == SND_PCM_STATE_RUNNING) {
dshare->state = SND_PCM_STATE_XRUN;
return -EPIPE;
}
dshare->state = SND_PCM_STATE_SETUP;
/* clear queue to remove pending poll events */
snd_pcm_direct_clear_timer_queue(dshare);
}
return 0;
}
