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pcm: hw: introduce SNDRV_PCM_HW_PARAMS_DRAIN_SILENCE

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The application may not require to touch the playback
sample stream for the drain operation at all. In this case,
the application is responsible to setup a silencing mechanism
for the playback or another graceful stop (like using the
rewind operation).

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2023-05-02 10:34:41 +02:00
parent 90e25887d2
commit 264d6c43ee
5 changed files with 45 additions and 1 deletions
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3
include/sound/uapi/asound.h
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@ -390,6 +390,9 @@ typedef int snd_pcm_hw_param_t;
#define SNDRV_PCM_HW_PARAMS_NORESAMPLE (1<<0) /* avoid rate resampling */
#define SNDRV_PCM_HW_PARAMS_EXPORT_BUFFER (1<<1) /* export buffer */
#define SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP (1<<2) /* disable period wakeups */
#define SNDRV_PCM_HW_PARAMS_NO_DRAIN_SILENCE (1<<3) /* suppress the silence fill
* for draining
*/
struct snd_interval {
unsigned int min, max;