mirrors/pipewire
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/pipewire/pipewire.git synced 2025-10-31 22:25:38 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

alsa-seq: use better clock rate matching

Browse source 
Match the elapsed queue time against the elapsed graph time.
This commit is contained in:
Wim Taymans 2021-09-02 18:37:27 +02:00
parent c2c7dd040a
commit 034dd00813
1 changed files with 13 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

24
spa/plugins/alsa/alsa-seq.c
View file

@ -700,7 +700,7 @@ static int update_time(struct seq_state *state, uint64_t nsec, bool follower)
{
snd_seq_queue_status_t *status;
const snd_seq_real_time_t* queue_time;
uint64_t queue_real, position;
uint64_t queue_real, duration;
double err, corr;
uint64_t clock_elapsed, queue_elapsed;
@ -709,27 +709,29 @@ static int update_time(struct seq_state *state, uint64_t nsec, bool follower)
state->rate = clock->rate;
state->duration = clock->duration;
state->threshold = state->duration;
position = clock->position;
duration = clock->duration;
} else {
position = 0;
duration = 1024;
}
corr = 1.0 - (state->dll.z2 + state->dll.z3);
/* take queue time */
snd_seq_queue_status_alloca(&status);
snd_seq_get_queue_status(state->event.hndl, state->event.queue_id, status);
queue_time = snd_seq_queue_status_get_real_time(status);
queue_real = SPA_TIMESPEC_TO_NSEC(queue_time);
if (state->queue_base == 0) {
state->queue_base = nsec - queue_real;
state->clock_base = position;
}
if (state->queue_base == 0)
queue_elapsed = 0;
else
queue_elapsed = (queue_real - state->queue_base) / corr;
corr = 1.0 - (state->dll.z2 + state->dll.z3);
state->queue_base = queue_real;
state->queue_time = queue_real;
clock_elapsed = position - state->clock_base;
state->queue_time = nsec - state->queue_base;
queue_elapsed = NSEC_TO_CLOCK(state->clock, state->queue_time) / corr;
queue_elapsed = NSEC_TO_CLOCK(state->clock, queue_elapsed);
clock_elapsed = duration;
err = ((int64_t)clock_elapsed - (int64_t) queue_elapsed);
err = SPA_CLAMP(err, -64, 64);