From: Timo Wischer twischer@de.adit-jv.com

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 --- src/pcm/pcm_null.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/pcm/pcm_null.c b/src/pcm/pcm_null.c index ff61624..c95fad8 100644 --- a/src/pcm/pcm_null.c +++ b/src/pcm/pcm_null.c @@ -261,7 +261,18 @@ 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. In addition such small buffers would only increase the CPU + * load but there is no benefit when throwing the samples anyway away. + */ + err = _snd_pcm_hw_param_set_min(params, SND_PCM_HW_PARAM_PERIOD_SIZE, + 32, 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;