thirdparty/alsa-lib
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fix infinite draining of the rate plugin in SND_PCM_NONBLOCK mode

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The draining function of the rate plugin does not handle properly the
SND_PCM_NONBLOCK case. It can write data to the slave plugin each time the
function is called, but does not update its internal state in order to
reach a stopping condition. Use a last_commit_ptr workaround to reach such
condition.

Signed-off-by: Sylvain BERTRAND <sylvain.bertrand@legeek.net>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
sylvain.bertrand@gmail.com 2020-04-28 12:09:18 +00:00 • committed by Jaroslav Kysela
parent 496e239e65
commit 29041c5220
1 changed files with 17 additions and 1 deletions
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18
src/pcm/pcm_rate.c
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@ -1051,6 +1051,7 @@ static int snd_pcm_rate_drain(snd_pcm_t *pcm)
/* commit the remaining fraction (if any) */
snd_pcm_uframes_t size, ofs, saved_avail_min;
snd_pcm_sw_params_t sw_params;
int commit_err;
__snd_pcm_lock(pcm);
/* temporarily set avail_min to one */
@ -1079,14 +1080,29 @@ static int snd_pcm_rate_drain(snd_pcm_t *pcm)
if (! spsize)
break;
}
snd_pcm_rate_commit_area(pcm, rate, ofs,
commit_err = snd_pcm_rate_commit_area(pcm, rate, ofs,
psize, spsize);
if (commit_err == 1) {
rate->last_commit_ptr += psize;
if (rate->last_commit_ptr >= pcm->boundary)
rate->last_commit_ptr = 0;
} else if (commit_err == 0) {
if (pcm->mode & SND_PCM_NONBLOCK != 0) {
commit_err = -EAGAIN;
break;
}
continue;
} else
break;
ofs = (ofs + psize) % pcm->buffer_size;
size -= psize;
}
sw_params.avail_min = saved_avail_min;
snd_pcm_sw_params(rate->gen.slave, &sw_params);
__snd_pcm_unlock(pcm);
if (commit_err < 0)
return commit_err;
}
return snd_pcm_drain(rate->gen.slave);
}