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alsa: Disable rate matching for the same card

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Add a clock name to the clock, remove the old api/clock_id. This makes
it easier to add descriptive names

Place the alsa card number in the clock name.

Check the clock name of the master clock and if it matches our own
clock, disable rate matching.
This commit is contained in:
Wim Taymans 2019-10-23 16:04:03 +02:00
parent 54f6834de4
commit 5383782336
5 changed files with 33 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

28
spa/plugins/alsa/alsa-pcm.c
View file

@ -21,6 +21,7 @@ static int spa_alsa_open(struct state *state)
{
int err;
struct props *props = &state->props;
snd_pcm_info_t *pcminfo;
if (state->opened)
return 0;
@ -42,6 +43,16 @@ static int spa_alsa_open(struct state *state)
state->timerfd = err;
snd_pcm_info_alloca(&pcminfo);
snd_pcm_info(state->hndl, pcminfo);
/* we would love to use the sync_id but it always returns 0, so use the
* card id for now */
state->card = snd_pcm_info_get_card(pcminfo);
if (state->clock) {
snprintf(state->clock->name, sizeof(state->clock->name),
"api.alsa.%d", state->card);
}
state->opened = true;
state->sample_count = 0;
state->sample_time = 0;
@ -608,7 +619,7 @@ static int get_status(struct state *state, snd_pcm_uframes_t *delay, snd_pcm_ufr
*target = state->last_threshold;
if (state->slaved && state->rate_match) {
if (state->matching && state->rate_match) {
state->delay = state->rate_match->delay;
state->read_size = state->rate_match->size;
/* We try to compensate for the latency introduced by rate matching
@ -618,6 +629,8 @@ static int get_status(struct state *state, snd_pcm_uframes_t *delay, snd_pcm_ufr
if (*target <= state->delay + 48)
state->delay = SPA_MAX(0, (int)(*target - 48 - state->delay));
*target -= state->delay;
} else {
state->delay = state->read_size = 0;
}
if (state->stream == SND_PCM_STREAM_PLAYBACK) {
@ -678,7 +691,7 @@ static int update_time(struct state *state, uint64_t nsec, snd_pcm_sframes_t del
else
state->rate_match->rate = SPA_CLAMP(1.0/corr, 0.95, 1.05);
SPA_FLAG_UPDATE(state->rate_match->flags, SPA_IO_RATE_MATCH_FLAG_ACTIVE, slave);
SPA_FLAG_UPDATE(state->rate_match->flags, SPA_IO_RATE_MATCH_FLAG_ACTIVE, state->matching);
}
state->next_time += state->threshold / corr * 1e9 / state->rate;
@ -1137,8 +1150,14 @@ int spa_alsa_start(struct state *state)
return 0;
state->slaved = is_slaved(state);
state->matching = state->slaved;
if (state->position) {
int card;
if (sscanf(state->position->clock.name, "api.alsa.%d", &card) == 1 &&
card == state->card) {
state->matching = false;
}
state->duration = state->position->clock.duration;
state->rate_denom = state->position->clock.rate.denom;
}
@ -1154,8 +1173,9 @@ int spa_alsa_start(struct state *state)
init_loop(state);
state->safety = 0.0;
spa_log_debug(state->log, NAME" %p: start %d duration:%d rate:%d slave:%d",
state, state->threshold, state->duration, state->rate_denom, state->slaved);
spa_log_debug(state->log, NAME" %p: start %d duration:%d rate:%d slave:%d match:%d",
state, state->threshold, state->duration, state->rate_denom,
state->slaved, state->matching);
CHECK(set_swparams(state), "swparams");
if (SPA_UNLIKELY(spa_log_level_enabled(state->log, SPA_LOG_LEVEL_DEBUG)))