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alsa-seq: improve timings

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Track the position of the clock instead of our own timer.
Implement stop.
This commit is contained in:
Wim Taymans 2019-09-25 10:14:25 +02:00
parent 387b281f5c
commit f0b3ed5257
2 changed files with 30 additions and 9 deletions
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36
spa/plugins/alsa/alsa-seq.c
View file

@ -130,6 +130,17 @@ static int seq_start(struct seq_state *state, struct seq_conn *conn)
return res;
}
static int seq_stop(struct seq_state *state, struct seq_conn *conn)
{
int res;
if ((res = snd_seq_stop_queue(conn->hndl, conn->queue_id, NULL)) < 0) {
spa_log_warn(state->log, "failed to stop queue: %s", snd_strerror(res));
}
while (snd_seq_drain_output(conn->hndl) > 0)
sleep(1);
return res;
}
static int init_stream(struct seq_state *state, enum spa_direction direction)
{
struct seq_stream *stream = &state->streams[direction];
@ -611,12 +622,15 @@ static void set_loop(struct seq_state *state, double bw)
state->bw = bw;
}
#define NSEC_TO_CLOCK(c,n) ((n) * (c)->rate.denom / ((c)->rate.num * SPA_NSEC_PER_SEC))
static int update_time(struct seq_state *state, uint64_t nsec, bool slave)
{
snd_seq_queue_status_t *status;
const snd_seq_real_time_t* queue_time;
uint64_t queue_real, queue_nsec;
uint64_t queue_real;
double err, corr;
uint64_t clock_elapsed, queue_elapsed;
/* take queue time */
snd_seq_queue_status_alloca(&status);
@ -624,13 +638,16 @@ static int update_time(struct seq_state *state, uint64_t nsec, bool slave)
queue_time = snd_seq_queue_status_get_real_time(status);
queue_real = SPA_TIMESPEC_TO_NSEC(queue_time);
if (state->queue_start == 0)
state->queue_start = state->current_time - queue_real;
if (state->queue_base == 0) {
state->queue_base = nsec - queue_real;
state->clock_base = state->clock->position;
}
state->queue_time = state->current_time - state->queue_start;
queue_nsec = state->queue_start + queue_real;
clock_elapsed = state->clock->position - state->clock_base;
state->queue_time = nsec - state->queue_base;
queue_elapsed = NSEC_TO_CLOCK(state->clock, state->queue_time);
err = ((int64_t)state->current_time - (int64_t) queue_nsec) / state->rate.denom;
err = ((int64_t)clock_elapsed - (int64_t) queue_elapsed);
if (state->bw == 0.0) {
set_loop(state, BW_MAX);
@ -657,7 +674,7 @@ static int update_time(struct seq_state *state, uint64_t nsec, bool slave)
state->next_time += state->threshold / corr * 1e9 / state->rate.denom;
if (!slave && state->clock) {
state->clock->nsec = state->current_time;
state->clock->nsec = nsec;
state->clock->position += state->duration;
state->clock->duration = state->duration;
state->clock->count = state->clock->position;
@ -667,7 +684,7 @@ static int update_time(struct seq_state *state, uint64_t nsec, bool slave)
}
spa_log_trace_fp(state->log, "now:%"PRIu64" queue:%"PRIu64" next:%"PRIu64" thr:%d",
state->current_time, queue_nsec, state->next_time, state->threshold);
nsec, queue_real, state->next_time, state->threshold);
return 0;
}
@ -774,6 +791,7 @@ int spa_alsa_seq_start(struct seq_state *state)
state->source.rmask = 0;
spa_loop_add_source(state->data_loop, &state->source);
state->queue_base = 0;
init_loop(state);
set_timers(state);
@ -834,6 +852,8 @@ int spa_alsa_seq_pause(struct seq_state *state)
spa_loop_invoke(state->data_loop, do_remove_source, 0, NULL, 0, true, state);
seq_stop(state, &state->event);
state->started = false;
return 0;

3
spa/plugins/alsa/alsa-seq.h
View file

@ -146,7 +146,8 @@ struct seq_state {
uint64_t next_time;
uint64_t base_time;
uint64_t queue_time;
uint64_t queue_start;
uint64_t queue_base;
uint64_t clock_base;
unsigned int opened:1;
unsigned int started:1;