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alsa-pcm: scale max_error with quantum size

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Adjust the max-error between the hardware delay and the quantum. Limit
this between 256 and quantum/2 to make sure we are not too sensitive.
This commit is contained in:
Wim Taymans 2022-05-11 10:34:27 +02:00
parent e6c2ac3450
commit 9d186cf622
2 changed files with 12 additions and 14 deletions
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6
spa/plugins/alsa/alsa-pcm.c
View file

@ -1873,6 +1873,7 @@ static inline void check_position_config(struct state *state)
state->duration = state->position->clock.duration;
state->rate_denom = state->position->clock.rate.denom;
state->threshold = (state->duration * state->rate + state->rate_denom-1) / state->rate_denom;
state->max_error = SPA_MAX(256.0f, state->threshold / 2.0f);
state->resample = ((uint32_t)state->rate != state->rate_denom) || state->matching;
state->alsa_sync = true;
}
@ -2412,11 +2413,10 @@ int spa_alsa_start(struct state *state)
state->following = is_following(state);
setup_matching(state);
spa_dll_init(&state->dll);
state->threshold = (state->duration * state->rate + state->rate_denom-1) / state->rate_denom;
state->last_threshold = state->threshold;
spa_dll_init(&state->dll);
state->max_error = (256.0 * state->rate) / state->rate_denom;
state->max_error = SPA_MAX(256.0f, state->threshold / 2.0f);
spa_log_debug(state->log, "%p: start %d duration:%d rate:%d follower:%d match:%d resample:%d",
state, state->threshold, state->duration, state->rate_denom,

20
spa/plugins/alsa/test-timer.c
View file

@ -32,15 +32,13 @@
#include <alsa/asoundlib.h>
#include <spa/utils/dll.h>
#include <spa/utils/defs.h>
#define DEFAULT_DEVICE "hw:0"
#define M_PI_M2 (M_PI + M_PI)
#define NSEC_PER_SEC 1000000000ll
#define TIMESPEC_TO_NSEC(ts) ((ts)->tv_sec * NSEC_PER_SEC + (ts)->tv_nsec)
#define BW_PERIOD (NSEC_PER_SEC * 3)
#define BW_PERIOD (SPA_NSEC_PER_SEC * 3)
struct state {
const char *device;
@ -65,8 +63,8 @@ struct state {
static int set_timeout(struct state *state, uint64_t time)
{
struct itimerspec ts;
ts.it_value.tv_sec = time / NSEC_PER_SEC;
ts.it_value.tv_nsec = time % NSEC_PER_SEC;
ts.it_value.tv_sec = time / SPA_NSEC_PER_SEC;
ts.it_value.tv_nsec = time % SPA_NSEC_PER_SEC;
ts.it_interval.tv_sec = 0;
ts.it_interval.tv_nsec = 0;
return timerfd_settime(state->timerfd, TFD_TIMER_ABSTIME, &ts, NULL);
@ -133,12 +131,12 @@ static int on_timer_wakeup(struct state *state)
CHECK(snd_pcm_htimestamp(state->hndl, &avail, &tstamp), "htimestamp");
delay = state->buffer_frames - avail;
then = TIMESPEC_TO_NSEC(&tstamp);
then = SPA_TIMESPEC_TO_NSEC(&tstamp);
if (then != 0) {
if (then < state->next_time) {
delay -= (state->next_time - then) * state->rate / NSEC_PER_SEC;
delay -= (state->next_time - then) * state->rate / SPA_NSEC_PER_SEC;
} else {
delay += (then - state->next_time) * state->rate / NSEC_PER_SEC;
delay += (then - state->next_time) * state->rate / SPA_NSEC_PER_SEC;
}
}
#endif
@ -278,7 +276,7 @@ int main(int argc, char *argv[])
spa_dll_init(&state.dll);
spa_dll_set_bw(&state.dll, SPA_DLL_BW_MAX, state.period, state.rate);
state.max_error = 256.0;
state.max_error = SPA_MAX(256.0, state.period / 2.0f);
if ((state.timerfd = timerfd_create(CLOCK_MONOTONIC, 0)) < 0)
perror("timerfd");
@ -290,7 +288,7 @@ int main(int argc, char *argv[])
/* set our first timeout for now */
clock_gettime(CLOCK_MONOTONIC, &now);
state.prev_time = state.next_time = TIMESPEC_TO_NSEC(&now);
state.prev_time = state.next_time = SPA_TIMESPEC_TO_NSEC(&now);
set_timeout(&state, state.next_time);
/* and start playback */