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alsa: improve capture resync

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Make sure we capture enough data even when the ringbuffer wraps
around.
Use the clock nsec to get timing, we don't need to get the new time.
Improve sync in capture.
This commit is contained in:
Wim Taymans 2019-04-26 15:48:21 +02:00
parent 317fd9fac5
commit b43844e7c6
1 changed files with 26 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

43
spa/plugins/alsa/alsa-utils.c
View file

@ -671,7 +671,6 @@ int spa_alsa_write(struct state *state, snd_pcm_uframes_t silence)
uint64_t nsec;
snd_pcm_sframes_t delay;
clock_gettime(CLOCK_MONOTONIC, &state->now);
if ((res = get_status(state, &delay)) < 0)
return res;
@ -691,7 +690,7 @@ int spa_alsa_write(struct state *state, snd_pcm_uframes_t silence)
state->alsa_sync = false;
}
nsec = SPA_TIMESPEC_TO_NSEC(&state->now);
nsec = state->position->clock.nsec;
if ((res = update_time(state, nsec, delay, true)) < 0)
return res;
}
@ -807,7 +806,7 @@ push_frames(struct state *state,
size_t n_bytes;
struct buffer *b;
struct spa_data *d;
uint32_t index, offs, avail, l0, l1;
uint32_t avail, l0, l1;
b = spa_list_first(&state->free, struct buffer, link);
spa_list_remove(&b->link);
@ -823,19 +822,17 @@ push_frames(struct state *state,
src = SPA_MEMBER(my_areas[0].addr, offset * state->frame_size, uint8_t);
avail = d[0].maxsize / state->frame_size;
index = 0;
total_frames = SPA_MIN(avail, frames);
total_frames = SPA_MIN(avail, state->threshold);
n_bytes = total_frames * state->frame_size;
offs = index % d[0].maxsize;
l0 = SPA_MIN(n_bytes, d[0].maxsize - offs);
l0 = SPA_MIN(n_bytes, frames * state->frame_size);
l1 = n_bytes - l0;
spa_memcpy(SPA_MEMBER(d[0].data, offs, void), src, l0);
spa_memcpy(d[0].data, src, l0);
if (l1 > 0)
spa_memcpy(d[0].data, src + l0, l1);
spa_memcpy(d[0].data, my_areas[0].addr, l1);
d[0].chunk->offset = index;
d[0].chunk->offset = 0;
d[0].chunk->size = n_bytes;
d[0].chunk->stride = state->frame_size;
@ -857,24 +854,30 @@ int spa_alsa_read(struct state *state, snd_pcm_uframes_t silence)
if (state->position && state->threshold != state->position->size)
state->threshold = state->position->size;
if (state->slaved) {
uint64_t nsec, master;
if (state->slaved && state->alsa_started) {
uint64_t nsec;
snd_pcm_sframes_t delay;
master = state->position->clock.position + state->position->clock.delay;
nsec = master * SPA_NSEC_PER_SEC / state->rate;
if ((res = get_status(state, &delay)) < 0)
return res;
if (delay > state->threshold * 2) {
if (delay < state->threshold || delay > state->threshold * 2) {
spa_log_warn(state->log, "slave: resync %f %f %f",
state->z1, state->z2, state->z3);
snd_pcm_forward(state->hndl, delay - state->threshold);
delay = state->threshold;
init_loop(state);
state->alsa_sync = true;
}
if (state->alsa_sync) {
if (delay < state->threshold)
snd_pcm_rewind(state->hndl, state->threshold - delay);
else if (delay > state->threshold)
snd_pcm_forward(state->hndl, delay - state->threshold);
delay = state->threshold;
state->alsa_sync = false;
}
nsec = state->position->clock.nsec;
if ((res = update_time(state, nsec, delay, true)) < 0)
return res;
}
@ -899,7 +902,11 @@ again:
return res;
}
if (to_read > read)
to_read -= read;
else
to_read = 0;
if (read > 0 && to_read >= state->threshold && !spa_list_is_empty(&state->free))
goto again;