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bluez5: media-sink: make ISO target latency scale with quantum

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The ISO target latency should scale with graph quantum, as jitter in the
graph processing time probably is proportional to the quantum.
This commit is contained in:
Pauli Virtanen 2025-03-08 11:35:35 +02:00 • committed by Wim Taymans
parent 90c0d8c225
commit ddc023b883
1 changed files with 25 additions and 7 deletions
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32
spa/plugins/bluez5/media-sink.c
View file

@ -493,7 +493,13 @@ static void set_latency(struct impl *this, bool emit_latency)
port->latency.min_ns = port->latency.max_ns = delay;
port->latency.min_rate = port->latency.max_rate = 0;
port->latency.min_quantum = port->latency.max_quantum = 0.0f;
if (this->transport->iso_io) {
/* ISO has different delay */
port->latency.min_quantum = port->latency.max_quantum = 1.0f;
} else {
port->latency.min_quantum = port->latency.max_quantum = 0.0f;
}
spa_log_info(this->log, "%p: total latency:%d ms", this, (int)(delay / SPA_NSEC_PER_MSEC));
@ -971,6 +977,7 @@ again:
if (this->need_flush) {
size_t avail = SPA_MIN(this->buffer_used, sizeof(iso_io->buf));
uint64_t delay = 0;
spa_log_trace(this->log, "%p: ISO put fd:%d size:%u sn:%u ts:%u now:%"PRIu64,
this, this->transport->fd, (unsigned)avail,
@ -984,7 +991,15 @@ again:
reset_buffer(this);
update_packet_delay(this, iso_io->duration * 3/2);
if (this->process_rate) {
/* Match target delay in media_iso_pull() */
delay = this->process_duration * SPA_NSEC_PER_SEC / this->process_rate;
if (delay < iso_io->duration*3/2)
delay = iso_io->duration*3/2 - delay;
else
delay = 0;
}
update_packet_delay(this, delay);
}
return 0;
}
@ -1179,12 +1194,11 @@ static void media_iso_pull(struct spa_bt_iso_io *iso_io)
}
/*
* Rate match sample position so that the graph is 3/2 ISO interval
* Rate match sample position so that the graph is max(ISO interval*3/2, quantum)
* ahead of the time instant we have to send data.
*
* Being 1 ISO interval ahead is unavoidable otherwise we underrun,
* and the 1/2 is safety margin for the graph to deliver data
* in time.
* Being 1 ISO interval ahead is unavoidable otherwise we underrun, and the
* rest is safety margin for the graph to deliver data in time.
*
* This is then the part of the TX latency on PipeWire side. There is
* another part of TX latency on kernel/controller side before the
@ -1192,7 +1206,11 @@ static void media_iso_pull(struct spa_bt_iso_io *iso_io)
*/
value = (int64_t)iso_io->now - (int64_t)get_reference_time(this, &duration_ns);
target = iso_io->duration * 3/2;
if (this->process_rate)
target = this->process_duration * SPA_NSEC_PER_SEC / this->process_rate;
else
target = 0;
target = SPA_MAX(target, iso_io->duration*3/2);
err = value - target;
max_err = iso_io->duration;