When executing ioctl(2) with SNDRV_PCM_IOCTL_HW_PARAMS, applications request ALSA PCM core to decide configurations of runtime of PCM substream. This operation shifts state of the runtime after the decision. Additionally, avail_min of the runtime is reset to the size of one period of PCM buffer.
When alsa-lib applications run with fallback mode from failure of page mapping of status/control data, the data in user space should be updated. On the other hand, they don't need to change/update control data. Current implementation of alsa-lib satisfies this principle with sub-effect to the control data. For this purpose, an added helper function can be available.
This commit replaces with the function.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- src/pcm/pcm_hw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/pcm/pcm_hw.c b/src/pcm/pcm_hw.c index 50619fe9..aa548529 100644 --- a/src/pcm/pcm_hw.c +++ b/src/pcm/pcm_hw.c @@ -349,7 +349,7 @@ static int snd_pcm_hw_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t * params) params->info &= ~0xf0000000; if (pcm->tstamp_type != SND_PCM_TSTAMP_TYPE_GETTIMEOFDAY) params->info |= SND_PCM_INFO_MONOTONIC; - return sync_ptr(hw, 0); + return query_state(hw); }
static void snd_pcm_hw_close_timer(snd_pcm_hw_t *hw)