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pcm: rate: add rewindable and forwardable callbacks

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This commit does not fix nonsense values returned by the rewind and
forward callbacks. E.g., with period_size = 1024 and buffer_size = 4096,
an attempt to rewind 1024 samples from the nearly-full buffer returns
4090.

Due to these nonsense values, the current rate plugin should be treated
as non-rewindable. That's why the new callbacks return 0.

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 2014-06-12 16:34:22 +06:00 • committed by Jaroslav Kysela
parent 9c3086fb74
commit 614a66bb2a
1 changed files with 12 additions and 0 deletions
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12
src/pcm/pcm_rate.c
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@ -689,6 +689,16 @@ static int snd_pcm_rate_reset(snd_pcm_t *pcm)
return 0;
}
static snd_pcm_sframes_t snd_pcm_rate_rewindable(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
{
return 0;
}
static snd_pcm_sframes_t snd_pcm_rate_forwardable(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
{
return 0;
}
static snd_pcm_sframes_t snd_pcm_rate_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames)
{
snd_pcm_rate_t *rate = pcm->private_data;
@ -1221,7 +1231,9 @@ static const snd_pcm_fast_ops_t snd_pcm_rate_fast_ops = {
.drop = snd_pcm_generic_drop,
.drain = snd_pcm_rate_drain,
.pause = snd_pcm_generic_pause,
.rewindable = snd_pcm_rate_rewindable,
.rewind = snd_pcm_rate_rewind,
.forwardable = snd_pcm_rate_forwardable,
.forward = snd_pcm_rate_forward,
.resume = snd_pcm_generic_resume,
.writei = snd_pcm_mmap_writei,