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bluez: introduce media.min-latency-ms for media source

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Target number of samples stored in buffer is calculated by
target = SPA_CLAMP(SPA_ROUND_UP(SPA_MAX(spike * 3/2, duration),
		SPA_CLAMP((int)this->rate / 50, 1, INT32_MAX)),
			duration, max_buf - 2*packet_size);
At beginning of the playback is spike == 0, so the target is set to
duration. Our BT is not able to maintain such low latency and drops
so spike is increased. This can happens multiple times until playback
is stable.

This strategy causes few dropouts at the beginning of a new playback,
in my case on each new track.

Add min-latency-ms property to reduces spikes and the likelihood of
dropouts at the beginning.
This commit is contained in:
Martin Geier 2026-05-26 12:34:03 +02:00 • committed by Carlos Rafael Giani
parent 943bce9c85
commit 32fe4dbda3
3 changed files with 18 additions and 0 deletions
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8
spa/plugins/bluez5/media-source.c
View file

@ -148,6 +148,7 @@ struct impl {
unsigned int decode_buffer_target;
unsigned int node_latency;
uint32_t min_latency_ms;
int fd;
struct spa_source source;
@ -1039,6 +1040,11 @@ static int transport_start(struct impl *this)
port->current_format.info.raw.rate * 80 / 1000);
}
if (this->min_latency_ms) {
spa_bt_decode_buffer_set_min_latency(&port->buffer,
this->min_latency_ms * port->current_format.info.raw.rate / 1000);
}
this->delay.buffer = -1;
this->delay.duration = 0;
this->update_delay_event = spa_loop_utils_add_event(this->loop_utils, update_delay_event, this);
@ -2249,6 +2255,8 @@ impl_init(const struct spa_handle_factory *factory,
spa_scnprintf(this->props.rate, sizeof(this->props.rate), "%s", str);
this->props.has_rate = true;
}
if ((str = spa_dict_lookup(info, SPA_KEY_API_BLUEZ5_MIN_LATENCY_MS)) != NULL)
spa_atou32(str, &this->min_latency_ms, 0);
}
if (this->is_duplex) {