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pcm: dmix: Do not discard slave reported delay in status result

Browse source 
Like the change done for dshare plugin, we can calculate the delay
more precisely from the slave PCM.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2016-11-29 14:53:53 +01:00
parent ea74ebbe4d
commit 38a2d2eda8
1 changed files with 28 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

45
src/pcm/pcm_dmix.c
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@ -391,23 +391,14 @@ static void snd_pcm_dmix_sync_area(snd_pcm_t *pcm)
/*
* synchronize hardware pointer (hw_ptr) with ours
*/
static int snd_pcm_dmix_sync_ptr(snd_pcm_t *pcm)
static int snd_pcm_dmix_sync_ptr0(snd_pcm_t *pcm, snd_pcm_uframes_t slave_hw_ptr)
{
snd_pcm_direct_t *dmix = pcm->private_data;
snd_pcm_uframes_t slave_hw_ptr, old_slave_hw_ptr, avail;
snd_pcm_uframes_t old_slave_hw_ptr, avail;
snd_pcm_sframes_t diff;
switch (snd_pcm_state(dmix->spcm)) {
case SND_PCM_STATE_DISCONNECTED:
dmix->state = SND_PCM_STATE_DISCONNECTED;
return -ENODEV;
default:
break;
}
if (dmix->slowptr)
snd_pcm_hwsync(dmix->spcm);
old_slave_hw_ptr = dmix->slave_hw_ptr;
slave_hw_ptr = dmix->slave_hw_ptr = *dmix->spcm->hw.ptr;
dmix->slave_hw_ptr = *dmix->spcm->hw.ptr;
diff = slave_hw_ptr - old_slave_hw_ptr;
if (diff == 0) /* fast path */
return 0;
@ -440,6 +431,24 @@ static int snd_pcm_dmix_sync_ptr(snd_pcm_t *pcm)
return 0;
}
static int snd_pcm_dmix_sync_ptr(snd_pcm_t *pcm)
{
snd_pcm_direct_t *dmix = pcm->private_data;
switch (snd_pcm_state(dmix->spcm)) {
case SND_PCM_STATE_DISCONNECTED:
dmix->state = SND_PCM_STATE_DISCONNECTED;
return -ENODEV;
default:
break;
}
if (dmix->slowptr)
snd_pcm_hwsync(dmix->spcm);
return snd_pcm_dmix_sync_ptr0(pcm, *dmix->spcm->hw.ptr);
}
/*
* plugin implementation
*/
@ -467,22 +476,24 @@ static int snd_pcm_dmix_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
{
snd_pcm_direct_t *dmix = pcm->private_data;
memset(status, 0, sizeof(*status));
snd_pcm_status(dmix->spcm, status);
switch (dmix->state) {
case SNDRV_PCM_STATE_DRAINING:
case SNDRV_PCM_STATE_RUNNING:
snd_pcm_dmix_sync_ptr(pcm);
snd_pcm_dmix_sync_ptr0(pcm, status->hw_ptr);
status->delay += snd_pcm_mmap_playback_delay(pcm)
+ status->avail - dmix->spcm->buffer_size;
break;
default:
break;
}
memset(status, 0, sizeof(*status));
snd_pcm_status(dmix->spcm, status);
status->state = snd_pcm_dmix_state(pcm);
status->trigger_tstamp = dmix->trigger_tstamp;
status->avail = snd_pcm_mmap_playback_avail(pcm);
status->avail_max = status->avail > dmix->avail_max ? status->avail : dmix->avail_max;
dmix->avail_max = 0;
status->delay = snd_pcm_mmap_playback_delay(pcm);
return 0;
}