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bluez5: use kernel-provided RX timestamps

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Use kernel-provided packet reception timestamps to get less jitter in
packet timings. Mostly matters for ISO/SCO which have regular schedule.

A2DP (L2CAP) doesn't currently do RX timestamps in kernel, but we can as
well use the same mechanism for it.
This commit is contained in:
Pauli Virtanen 2025-03-22 14:18:58 +02:00 • committed by Wim Taymans
parent 081116906d
commit 0d61cc1b1d
8 changed files with 165 additions and 31 deletions
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15
spa/plugins/bluez5/sco-source.c
View file

@ -153,7 +153,7 @@ struct impl {
void *lc3;
#endif
struct timespec now;
uint64_t now;
};
#define CHECK_PORT(this,d,p) ((d) == SPA_DIRECTION_OUTPUT && (p) == 0)
@ -538,7 +538,7 @@ static uint32_t preprocess_and_decode_codec_data(void *userdata, uint8_t *read_d
return decoded;
}
static int sco_source_cb(void *userdata, uint8_t *read_data, int size_read)
static int sco_source_cb(void *userdata, uint8_t *read_data, int size_read, uint64_t rx_time)
{
struct impl *this = userdata;
struct port *port = &this->port;
@ -555,9 +555,8 @@ static int sco_source_cb(void *userdata, uint8_t *read_data, int size_read)
}
/* update the current pts */
dt = SPA_TIMESPEC_TO_NSEC(&this->now);
spa_system_clock_gettime(this->data_system, CLOCK_MONOTONIC, &this->now);
dt = SPA_TIMESPEC_TO_NSEC(&this->now) - dt;
dt = rx_time - this->now;
this->now = rx_time;
/* handle data read from socket */
#if 0
@ -566,7 +565,7 @@ static int sco_source_cb(void *userdata, uint8_t *read_data, int size_read)
if (this->transport->codec == HFP_AUDIO_CODEC_MSBC ||
this->transport->codec == HFP_AUDIO_CODEC_LC3_SWB) {
decoded = preprocess_and_decode_codec_data(userdata, read_data, size_read, SPA_TIMESPEC_TO_NSEC(&this->now));
decoded = preprocess_and_decode_codec_data(userdata, read_data, size_read, this->now);
} else {
uint32_t avail;
uint8_t *packet;
@ -591,7 +590,7 @@ static int sco_source_cb(void *userdata, uint8_t *read_data, int size_read)
packet = spa_bt_decode_buffer_get_write(&port->buffer, &avail);
avail = SPA_MIN(avail, (uint32_t)size_read);
spa_memmove(packet, read_data, avail);
spa_bt_decode_buffer_write_packet(&port->buffer, avail, SPA_TIMESPEC_TO_NSEC(&this->now));
spa_bt_decode_buffer_write_packet(&port->buffer, avail, this->now);
decoded = avail;
}
@ -763,7 +762,7 @@ static int transport_start(struct impl *this)
this->io_error = false;
/* Start socket i/o */
if ((res = spa_bt_transport_ensure_sco_io(this->transport, this->data_loop)) < 0)
if ((res = spa_bt_transport_ensure_sco_io(this->transport, this->data_loop, this->data_system)) < 0)
goto fail;
spa_loop_invoke(this->data_loop, do_add_source, 0, NULL, 0, true, this);