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rate: handle negative values from snd_pcm_mmap_playback_hw_avail

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Such negative returns are possible during an underrun if xrun detection
is disabled.

So, don't store the result in an unsigned variable (where it will
overflow), and postpone the trigger in such case, too.

Signed-off-by: Alexander E. Patrakov <patrakov@gmail.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Alexander E. Patrakov 2014-09-14 00:30:18 +06:00 • committed by Jaroslav Kysela
parent 4fafa468d4
commit ff9d213ff8
1 changed files with 2 additions and 2 deletions
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4
src/pcm/pcm_rate.c
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@ -1058,7 +1058,7 @@ static snd_pcm_state_t snd_pcm_rate_state(snd_pcm_t *pcm)
static int snd_pcm_rate_start(snd_pcm_t *pcm)
{
snd_pcm_rate_t *rate = pcm->private_data;
snd_pcm_uframes_t avail;
snd_pcm_sframes_t avail;
if (pcm->stream == SND_PCM_STREAM_CAPTURE)
return snd_pcm_start(rate->gen.slave);
@ -1069,7 +1069,7 @@ static int snd_pcm_rate_start(snd_pcm_t *pcm)
gettimestamp(&rate->trigger_tstamp, pcm->tstamp_type);
avail = snd_pcm_mmap_playback_hw_avail(rate->gen.slave);
if (avail == 0) {
if (avail <= 0) {
/* postpone the trigger since we have no data committed yet */
rate->start_pending = 1;
return 0;