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pcm: rewindable, forwardable: don't return stale data

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The current behavior of snd_pcm_rewindable and snd_pcm_forwardable means
that the returned value is only accurate to one period. Or maybe even
meaningless if period interrupts are off. Fetch the up-to-date position
of the hardware pointer, as that's what is wanted by callers.

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 00:30:20 +06:00 • committed by Jaroslav Kysela
parent e5e1af8388
commit 6db0fe495e
6 changed files with 32 additions and 0 deletions
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6
src/pcm/pcm_dmix.c
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@ -661,6 +661,9 @@ static int snd_pcm_dmix_pause(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int enable ATTRIB
static snd_pcm_sframes_t snd_pcm_dmix_rewindable(snd_pcm_t *pcm)
{
int err = snd_pcm_dmix_hwsync(pcm);
if (err < 0)
return err;
return snd_pcm_mmap_playback_hw_rewindable(pcm);
}
@ -744,6 +747,9 @@ static snd_pcm_sframes_t snd_pcm_dmix_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t f
static snd_pcm_sframes_t snd_pcm_dmix_forwardable(snd_pcm_t *pcm)
{
int err = snd_pcm_dmix_hwsync(pcm);
if (err < 0)
return err;
return snd_pcm_mmap_avail(pcm);
}