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alsa: increase target for a52 and dca

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For encoded format, we need to send bigger chunks to make the encoder
happy. Add a new min_delay variable with this info so that we never
leave less than that amount of samples in the ringbuffer.

Fixes #2650
This commit is contained in:
Wim Taymans 2022-12-14 12:27:33 +01:00
parent cbc75dc98d
commit e5ac60b2b2
2 changed files with 11 additions and 3 deletions
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13
spa/plugins/alsa/alsa-pcm.c
View file

@ -1583,11 +1583,18 @@ int spa_alsa_set_format(struct state *state, struct spa_audio_info *fmt, uint32_
if (is_batch)
state->headroom += period_size;
if (spa_strstartswith(state->props.device, "a52") ||
spa_strstartswith(state->props.device, "dca"))
state->min_delay = SPA_MIN(2048u, state->buffer_frames);
else
state->min_delay = 0;
state->headroom = SPA_MIN(state->headroom, state->buffer_frames);
state->start_delay = state->default_start_delay;
state->latency[state->port_direction].min_rate = state->headroom;
state->latency[state->port_direction].max_rate = state->headroom;
state->latency[state->port_direction].min_rate =
state->latency[state->port_direction].max_rate =
SPA_MAX(state->min_delay, state->headroom);
spa_log_info(state->log, "%s (%s): format:%s access:%s-%s rate:%d channels:%d "
"buffer frames %lu, period frames %lu, periods %u, frame_size %zd "
@ -1859,7 +1866,7 @@ static int get_status(struct state *state, uint64_t current_time,
*delay = avail;
*target = SPA_MAX(*target, state->read_size);
}
*target = SPA_MIN(*target, state->buffer_frames);
*target = SPA_CLAMP(*target, state->min_delay, state->buffer_frames);
return 0;
}

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

@ -197,6 +197,7 @@ struct state {
uint32_t last_threshold;
uint32_t headroom;
uint32_t start_delay;
uint32_t min_delay;
uint32_t duration;
unsigned int alsa_started:1;