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ALSA: pcm: add SNDRV_PCM_TRIGGER_DRAIN trigger

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Add SNDRV_PCM_TRIGGER_DRAIN trigger for pcm drain.

Some audio devices require notification of drain events
in order to properly drain and shutdown an audio stream.

Signed-off-by: Libin Yang <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Libin Yang 2014-12-31 22:09:54 +08:00 • committed by Takashi Iwai
commit 48d882978e
3 changed files with 11 additions and 1 deletions
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1
include/sound/pcm.h
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@ -106,6 +106,7 @@ struct snd_pcm_ops {
#define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
#define SNDRV_PCM_TRIGGER_SUSPEND 5
#define SNDRV_PCM_TRIGGER_RESUME 6
#define SNDRV_PCM_TRIGGER_DRAIN 7
#define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)