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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_plugin.c
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@ -198,6 +198,9 @@ static int snd_pcm_plugin_reset(snd_pcm_t *pcm)
static snd_pcm_sframes_t snd_pcm_plugin_rewindable(snd_pcm_t *pcm)
{
int err = snd_pcm_generic_hwsync(pcm);
if (err < 0)
return err;
return snd_pcm_mmap_hw_rewindable(pcm);
}
@ -226,6 +229,9 @@ snd_pcm_sframes_t snd_pcm_plugin_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames
static snd_pcm_sframes_t snd_pcm_plugin_forwardable(snd_pcm_t *pcm)
{
int err = snd_pcm_generic_hwsync(pcm);
if (err < 0)
return err;
return snd_pcm_mmap_avail(pcm);
}