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alsa: have slaved sink

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When we are slaved, calculate our rate difference with the master
This commit is contained in:
Wim Taymans 2018-11-12 10:18:21 +01:00
parent 6f555c63e2
commit 416b9c254e
2 changed files with 56 additions and 19 deletions
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44
spa/plugins/alsa/alsa-utils.c
View file

@ -537,9 +537,35 @@ int spa_alsa_write(struct state *state, snd_pcm_uframes_t silence)
{
snd_pcm_t *hndl = state->hndl;
const snd_pcm_channel_area_t *my_areas;
snd_pcm_uframes_t written, frames = state->buffer_frames, offset, off, to_write;
snd_pcm_uframes_t written, frames, offset, off, to_write;
int res;
if (state->position)
state->threshold = state->position->size;
if (state->slaved) {
double dts, pts, rate_diff = 1.0;
struct timespec now;
snd_pcm_sframes_t avail;
if ((res = get_status(state, &avail, &now)) < 0)
return res;
state->now = now;
state->filled = state->buffer_frames - avail;
dts = ((state->position->clock.position - state->filled) * 1000000ll / state->rate);
pts = dll_update(&state->dll, dts, state->threshold);
rate_diff = state->dll.T * state->rate / 1000000.f;
if (state->bw != 0.05 && state->sample_count / state->rate > 4) {
state->bw = 0.05;
dll_bandwidth(&state->dll, state->threshold, state->rate, state->bw);
}
spa_log_trace(state->log, "slave %f %f %f", dts, pts, rate_diff);
}
frames = state->buffer_frames;
if ((res = snd_pcm_mmap_begin(hndl, &my_areas, &offset, &frames)) < 0) {
spa_log_error(state->log, "snd_pcm_mmap_begin error: %s", snd_strerror(res));
return res;
@ -717,11 +743,11 @@ static void alsa_on_playback_timeout_event(struct spa_source *source)
if ((res = get_status(state, &avail, &now)) < 0)
return;
state->now = now;
if (state->position)
state->threshold = state->position->size;
state->now = now;
if (avail > state->buffer_frames)
avail = state->buffer_frames;
@ -866,7 +892,13 @@ int spa_alsa_start(struct state *state, bool xrun_recover)
if (state->position)
state->threshold = state->position->size;
state->bw = 1.0;
state->slaved = false;
if (state->position && state->clock) {
if (state->position->clock.id != state->clock->id)
state->slaved = true;
}
state->bw = 0.128;
dll_init(&state->dll, state->threshold, state->rate, state->bw);
spa_log_debug(state->log, "alsa %p: start %d", state, state->threshold);
@ -880,6 +912,7 @@ int spa_alsa_start(struct state *state, bool xrun_recover)
return err;
}
if (!state->slaved) {
if (state->stream == SND_PCM_STREAM_PLAYBACK) {
state->source.func = alsa_on_playback_timeout_event;
} else {
@ -890,6 +923,7 @@ int spa_alsa_start(struct state *state, bool xrun_recover)
state->source.mask = SPA_IO_IN;
state->source.rmask = 0;
spa_loop_add_source(state->data_loop, &state->source);
}
if (state->stream == SND_PCM_STREAM_PLAYBACK) {
state->alsa_started = false;
@ -901,12 +935,14 @@ int spa_alsa_start(struct state *state, bool xrun_recover)
state->alsa_started = true;
}
if (!state->slaved) {
clock_gettime(CLOCK_MONOTONIC, &state->now);
ts.it_value.tv_sec = 0;
ts.it_value.tv_nsec = 1;
ts.it_interval.tv_sec = 0;
ts.it_interval.tv_nsec = 0;
timerfd_settime(state->timerfd, 0, &ts, NULL);
}
state->io->status = SPA_STATUS_OK;
state->io->buffer_id = SPA_ID_INVALID;

1
spa/plugins/alsa/alsa-utils.h
View file

@ -122,6 +122,7 @@ struct state {
struct spa_source source;
int timerfd;
bool alsa_started;
bool slaved;
int threshold;
snd_htimestamp_t now;