static int snd_pcm_dmix_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delayp)
{
snd_pcm_direct_t *dmix = pcm->private_data;
int err;
switch(dmix->state) {
case SNDRV_PCM_STATE_DRAINING:
case SNDRV_PCM_STATE_RUNNING:
err = snd_pcm_dmix_sync_ptr(pcm);
if (err < 0)
return err;
/* fallthru */
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_SUSPENDED:
case STATE_RUN_PENDING:
*delayp = snd_pcm_mmap_playback_hw_avail(pcm);
return 0;
case SNDRV_PCM_STATE_XRUN:
return -EPIPE;
case SNDRV_PCM_STATE_DISCONNECTED:
return -ENODEV;
default:
return -EBADFD;
}
}
/* locked version */
static int __snd_pcm_dmix_drain(snd_pcm_t *pcm)
{
snd_pcm_direct_t *dmix = pcm->private_data;
snd_pcm_uframes_t stop_threshold;
int err;
switch (snd_pcm_state(dmix->spcm)) {
case SND_PCM_STATE_SUSPENDED:
return -ESTRPIPE;
default:
break;
}
if (dmix->state == SND_PCM_STATE_OPEN)
return -EBADFD;
if (pcm->mode & SND_PCM_NONBLOCK)
return -EAGAIN;
if (dmix->state == SND_PCM_STATE_PREPARED) {
if (snd_pcm_mmap_playback_hw_avail(pcm) > 0)
snd_pcm_dmix_start(pcm);
else {
snd_pcm_dmix_drop(pcm);
return 0;
}
}
if (dmix->state == SND_PCM_STATE_XRUN) {
snd_pcm_dmix_drop(pcm);
return 0;
}
stop_threshold = pcm->stop_threshold;
if (pcm->stop_threshold > pcm->buffer_size)
pcm->stop_threshold = pcm->buffer_size;
dmix->state = SND_PCM_STATE_DRAINING;
do {
err = snd_pcm_dmix_sync_ptr(pcm);
if (err < 0) {
snd_pcm_dmix_drop(pcm);
return err;
}
if (dmix->state == SND_PCM_STATE_DRAINING) {
snd_pcm_dmix_sync_area(pcm);
snd_pcm_wait_nocheck(pcm, -1);
snd_pcm_direct_clear_timer_queue(dmix); /* force poll to wait */
switch (snd_pcm_state(dmix->spcm)) {
case SND_PCM_STATE_SUSPENDED:
return -ESTRPIPE;
default:
break;
}
}
} while (dmix->state == SND_PCM_STATE_DRAINING);
pcm->stop_threshold = stop_threshold;
return 0;
}
static int snd_pcm_dshare_drain(snd_pcm_t *pcm)
{
snd_pcm_direct_t *dshare = pcm->private_data;
snd_pcm_uframes_t stop_threshold;
int err;
if (dshare->state == SND_PCM_STATE_OPEN)
return -EBADFD;
if (pcm->mode & SND_PCM_NONBLOCK)
return -EAGAIN;
if (dshare->state == SND_PCM_STATE_PREPARED) {
if (snd_pcm_mmap_playback_hw_avail(pcm) > 0)
snd_pcm_dshare_start(pcm);
else {
snd_pcm_dshare_drop(pcm);
return 0;
}
}
if (dshare->state == SND_PCM_STATE_XRUN) {
snd_pcm_dshare_drop(pcm);
return 0;
}
stop_threshold = pcm->stop_threshold;
if (pcm->stop_threshold > pcm->buffer_size)
pcm->stop_threshold = pcm->buffer_size;
dshare->state = SND_PCM_STATE_DRAINING;
do {
err = snd_pcm_dshare_sync_ptr(pcm);
if (err < 0) {
snd_pcm_dshare_drop(pcm);
break;
}
if (dshare->state == SND_PCM_STATE_DRAINING) {
snd_pcm_dshare_sync_area(pcm);
snd_pcm_wait_nocheck(pcm, -1);
snd_pcm_direct_clear_timer_queue(dshare); /* force poll to wait */
}
} while (dshare->state == SND_PCM_STATE_DRAINING);
pcm->stop_threshold = stop_threshold;
return 0;
}
static int snd_pcm_dmix_start(snd_pcm_t *pcm)
{
snd_pcm_direct_t *dmix = pcm->private_data;
snd_pcm_sframes_t avail;
int err;
if (dmix->state != SND_PCM_STATE_PREPARED)
return -EBADFD;
avail = snd_pcm_mmap_playback_hw_avail(pcm);
if (avail == 0)
dmix->state = STATE_RUN_PENDING;
else if (avail < 0)
return 0;
else {
if ((err = snd_pcm_dmix_start_timer(pcm, dmix)) < 0)
return err;
snd_pcm_dmix_sync_area(pcm);
}
gettimestamp(&dmix->trigger_tstamp, pcm->tstamp_type);
return 0;
}
static int snd_pcm_dshare_start(snd_pcm_t *pcm)
{
snd_pcm_direct_t *dshare = pcm->private_data;
snd_pcm_sframes_t avail;
struct timeval tv;
int err;
if (dshare->state != SND_PCM_STATE_PREPARED)
return -EBADFD;
avail = snd_pcm_mmap_playback_hw_avail(pcm);
if (avail == 0)
dshare->state = STATE_RUN_PENDING;
else if (avail < 0)
return 0;
else {
if ((err = snd_pcm_dshare_start_timer(dshare)) < 0)
return err;
snd_pcm_dshare_sync_area(pcm);
}
gettimeofday(&tv, 0);
dshare->trigger_tstamp.tv_sec = tv.tv_sec;
dshare->trigger_tstamp.tv_nsec = tv.tv_usec * 1000L;
return 0;
}
