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bluez5: media-source: account for sink latency for BAP

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BAP delay to rendering should be constant, so take sink latency into
account when selecting the buffer level.
This commit is contained in:
Pauli Virtanen 2024-11-29 20:02:42 +02:00
parent 2847d90b4b
commit 41ca76685c
1 changed files with 16 additions and 3 deletions
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19
spa/plugins/bluez5/media-source.c
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@ -165,6 +165,7 @@ struct impl {
uint32_t errqueue_count;
struct delay_info delay;
int64_t delay_sink;
struct spa_source *update_delay_event;
};
@ -672,6 +673,7 @@ static void update_transport_delay(struct impl *this)
struct delay_info info;
float latency;
int64_t latency_nsec;
int64_t delay_sink;
if (!this->transport || !port->have_format)
return;
@ -688,6 +690,13 @@ static void update_transport_delay(struct impl *this)
spa_bt_transport_set_delay(this->transport, latency_nsec);
delay_sink =
port->latency[SPA_DIRECTION_INPUT].min_ns
+ (int64_t)((port->latency[SPA_DIRECTION_INPUT].min_rate
+ port->latency[SPA_DIRECTION_INPUT].min_quantum * info.duration)
* SPA_NSEC_PER_SEC / port->current_format.info.raw.rate);
__atomic_store_n(&this->delay_sink, delay_sink, __ATOMIC_RELAXED);
/* Latency from source */
port->latency[SPA_DIRECTION_OUTPUT] = SPA_LATENCY_INFO(SPA_DIRECTION_OUTPUT,
.min_rate = info.buffer, .max_rate = info.buffer);
@ -1437,7 +1446,8 @@ static uint32_t get_samples(struct impl *this, uint32_t *result_duration)
static void update_target_latency(struct impl *this)
{
struct port *port = &this->port;
uint32_t samples, duration;
uint32_t samples, duration, latency;
int64_t delay_sink;
if (this->transport == NULL || !port->have_format)
return;
@ -1463,8 +1473,11 @@ static void update_target_latency(struct impl *this)
samples = (uint64_t)this->transport->delay_us *
port->current_format.info.raw.rate / SPA_USEC_PER_SEC;
if (samples > duration)
samples -= duration;
delay_sink = __atomic_load_n(&this->delay_sink, __ATOMIC_RELAXED);
latency = duration + delay_sink * port->current_format.info.raw.rate / SPA_NSEC_PER_SEC;
if (samples > latency)
samples -= latency;
else
samples = 1;