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pcm: null: Do not allow a period size of 0

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Some applications do not expect that get_period_size_min() could
return 0. Therefore these applications cannot use the null plugin without
this patch.
Due to there is no use case for having a period size of 0 this patch
disallows a period size of 0 when using the null plugin.

Signed-off-by: Timo Wischer <twischer@de.adit-jv.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Timo Wischer 2019-04-08 10:55:54 +02:00 • committed by Takashi Iwai
parent fc0e54c3cc
commit 0d92f2d39a
1 changed files with 11 additions and 1 deletions
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12
src/pcm/pcm_null.c
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@ -261,7 +261,17 @@ static snd_pcm_sframes_t snd_pcm_null_mmap_commit(snd_pcm_t *pcm,
static int snd_pcm_null_hw_refine(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params)
{
int err = snd_pcm_hw_refine_soft(pcm, params);
int err;
/* Do not return a period size of 0 because for example portaudio cannot
* handle it.
*/
err = _snd_pcm_hw_param_set_min(params, SND_PCM_HW_PARAM_PERIOD_SIZE, 1,
0);
if (err < 0)
return err;
err = snd_pcm_hw_refine_soft(pcm, params);
params->info = SND_PCM_INFO_MMAP | SND_PCM_INFO_MMAP_VALID |
SND_PCM_INFO_RESUME | SND_PCM_INFO_PAUSE;
params->fifo_size = 0;