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pcm: improve handling for snd_pcm_wait()

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The snd_pcm_wait() function is called also internally from
the various plugins to wait for the drain with -1 and from i/o
routines in pcm.c.

Define two special negative timeout values to distinguish the
drain and i/o wait and calculate the maximal timeout according
the wait place.

Fixes: https://github.com/alsa-project/alsa-lib/issues/228
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2023-05-02 16:56:49 +02:00
parent 1de6f99c7d
commit e2d9e41174
9 changed files with 55 additions and 10 deletions
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7
include/pcm.h
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@ -498,6 +498,13 @@ typedef union _snd_pcm_sync_id {
unsigned int id32[4];
} snd_pcm_sync_id_t;
/** Infinite wait for snd_pcm_wait() */
#define SND_PCM_WAIT_INFINITE (-1)
/** Wait for next i/o in snd_pcm_wait() */
#define SND_PCM_WAIT_IO (-10001)
/** Wait for drain in snd_pcm_wait() */
#define SND_PCM_WAIT_DRAIN (-10002)
/** #SND_PCM_TYPE_METER scope handle */
typedef struct _snd_pcm_scope snd_pcm_scope_t;