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alsaloop: try adapt avail_min for playback to avoid 100% CPU usage

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This commit is contained in:
Jaroslav Kysela 2016-10-18 13:57:19 +02:00
parent b59745978f
commit e61f35ba4d
2 changed files with 47 additions and 3 deletions
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1
alsaloop/alsaloop.h
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@ -109,6 +109,7 @@ struct loopback_handle {
snd_pcm_uframes_t buf_count; /* filled samples */
snd_pcm_uframes_t buf_size; /* buffer size in frames */
snd_pcm_uframes_t buf_over; /* capture buffer overflow */
int stall;
/* statistics */
snd_pcm_uframes_t max;
unsigned long long counter;

49
alsaloop/pcmjob.c
View file

@ -282,6 +282,35 @@ static int setparams_set(struct loopback_handle *lhandle,
return 0;
}
static int increase_playback_avail_min(struct loopback_handle *lhandle)
{
snd_pcm_t *handle = lhandle->handle;
snd_pcm_sw_params_t *swparams;
int err;
snd_pcm_sw_params_alloca(&swparams);
err = snd_pcm_sw_params_current(handle, swparams);
if (err < 0) {
logit(LOG_CRIT, "Unable to determine current swparams for %s: %s\n", lhandle->id, snd_strerror(err));
return err;
}
err = snd_pcm_sw_params_set_avail_min(handle, swparams, lhandle->avail_min + 4);
if (err < 0) {
logit(LOG_CRIT, "Unable to set avail min for %s: %s\n", lhandle->id, snd_strerror(err));
return err;
}
snd_pcm_sw_params_get_avail_min(swparams, &lhandle->avail_min);
if (verbose > 6)
snd_output_printf(lhandle->loopback->output, "%s: change avail_min=%li\n", lhandle->id, lhandle->avail_min);
printf("%s: change avail_min=%li\n", lhandle->id, lhandle->avail_min);
err = snd_pcm_sw_params(handle, swparams);
if (err < 0) {
logit(LOG_CRIT, "Unable to set sw params for %s: %s\n", lhandle->id, snd_strerror(err));
return err;
}
return 0;
}
static int setparams(struct loopback *loop, snd_pcm_uframes_t bufsize)
{
int err;
@ -1763,7 +1792,7 @@ int pcmjob_pollfds_handle(struct loopback *loop, struct pollfd *fds)
struct loopback_handle *capt = loop->capt;
unsigned short prevents, crevents, events;
snd_pcm_uframes_t ccount, pcount;
int err, loopcount = 10, idx;
int err, loopcount = 0, idx;
if (verbose > 11)
snd_output_printf(loop->output, "%s: pollfds handle\n", loop->id);
@ -1843,6 +1872,18 @@ int pcmjob_pollfds_handle(struct loopback *loop, struct pollfd *fds)
goto __pcm_end;
do {
ccount = readit(capt);
if (prevents != 0 && crevents == 0 &&
ccount == 0 && loopcount == 0) {
if (play->stall > 20) {
play->stall = 0;
increase_playback_avail_min(play);
break;
}
play->stall++;
break;
}
if (ccount > 0)
play->stall = 0;
buf_add(loop, ccount);
if (capt->xrun_pending || loop->reinit)
break;
@ -1850,10 +1891,12 @@ int pcmjob_pollfds_handle(struct loopback *loop, struct pollfd *fds)
buffer, feed them there */
pcount = writeit(play);
buf_remove(loop, pcount);
if (pcount > 0)
play->stall = 0;
if (play->xrun_pending || loop->reinit)
break;
loopcount--;
} while ((ccount > 0 || pcount > 0) && loopcount > 0);
loopcount++;
} while ((ccount > 0 || pcount > 0) && loopcount > 10);
if (play->xrun_pending || capt->xrun_pending) {
if ((err = xrun_sync(loop)) < 0)
return err;