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pcm: hw: do not reset tstamp_type in SND_PCM_APPEND mode

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When the first client of plugins such as dshare open the hw device they set
a default tstamp_type in snd_pcm_direct_initialize_slave based on
tstamp_type from the config file. But when subsequent clients open the same
plugin the snd_pcm_hw_open_fd function clobbers this default.

Closes: https://github.com/alsa-project/alsa-lib/pull/450
Signed-off-by: Kevin Groeneveld <kgroeneveld@lenbrook.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Kevin Groeneveld 2025-04-04 15:59:59 -04:00 • committed by Jaroslav Kysela
parent a4e47461ec
commit 7e01443ecc
1 changed files with 18 additions and 16 deletions
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34
src/pcm/pcm_hw.c
View file

@ -1665,26 +1665,28 @@ int snd_pcm_hw_open_fd(snd_pcm_t **pcmp, const char *name, int fd,
} }
} }
if (!(mode & SND_PCM_APPEND)) {
#if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC) #if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC)
if (SNDRV_PROTOCOL_VERSION(2, 0, 9) <= ver) { if (SNDRV_PROTOCOL_VERSION(2, 0, 9) <= ver) {
struct timespec timespec; struct timespec timespec;
if (clock_gettime(CLOCK_MONOTONIC, &timespec) == 0) { if (clock_gettime(CLOCK_MONOTONIC, &timespec) == 0) {
int on = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC; int on = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
if (ioctl(fd, SNDRV_PCM_IOCTL_TTSTAMP, &on) < 0) { if (ioctl(fd, SNDRV_PCM_IOCTL_TTSTAMP, &on) < 0) {
ret = -errno;
SNDMSG("TTSTAMP failed");
return ret;
}
tstamp_type = SND_PCM_TSTAMP_TYPE_MONOTONIC;
}
} else
#endif
if (SNDRV_PROTOCOL_VERSION(2, 0, 5) <= ver) {
int on = 1;
if (ioctl(fd, SNDRV_PCM_IOCTL_TSTAMP, &on) < 0) {
ret = -errno; ret = -errno;
SNDMSG("TTSTAMP failed"); SNDMSG("TSTAMP failed");
return ret; return ret;
} }
tstamp_type = SND_PCM_TSTAMP_TYPE_MONOTONIC;
}
} else
#endif
if (SNDRV_PROTOCOL_VERSION(2, 0, 5) <= ver) {
int on = 1;
if (ioctl(fd, SNDRV_PCM_IOCTL_TSTAMP, &on) < 0) {
ret = -errno;
SNDMSG("TSTAMP failed");
return ret;
} }
} }