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modules: align rtp_timestamps for sender

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When the driver changes, the clock position can also change and there
would be a discont in the rtp_timestamp.

This is not usually a problem except in RAOP mode where the base rtp
timestamp is negotiated and anything that deviates too much is to be
discarded.

If we are not using direct_timestamp for the sender, make sure we always
keep the rtp_time aligned to avoid this problem.

See #5167
This commit is contained in:
Wim Taymans 2026-03-17 14:01:27 +01:00
parent f4587ea434
commit 6bf81ebe59
2 changed files with 6 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

8
src/modules/module-rtp/audio.c
View file

@ -546,7 +546,7 @@ static void rtp_audio_flush_packets(struct impl *impl, uint32_t num_packets, uin
else
header.m = 0;
rtp_timestamp = impl->ts_offset + (set_timestamp ? set_timestamp : timestamp);
rtp_timestamp = impl->ts_offset + impl->ts_align + (set_timestamp ? set_timestamp : timestamp);
header.sequence_number = htons(impl->seq);
header.timestamp = htonl(rtp_timestamp);
@ -705,8 +705,10 @@ static void rtp_audio_process_capture(void *data)
* that resynchronization is needed, then this will be done immediately below. */
if (!impl->have_sync) {
pw_log_info("(re)sync to timestamp:%u seq:%u ts_offset:%u SSRC:%u",
actual_timestamp, impl->seq, impl->ts_offset, impl->ssrc);
if (!impl->direct_timestamp)
impl->ts_align = actual_timestamp - impl->ring.readindex;
pw_log_info("(re)sync to timestamp:%u seq:%u ts_offset:%u ts_align:%u SSRC:%u",
actual_timestamp, impl->seq, impl->ts_offset, impl->ts_align, impl->ssrc);
spa_ringbuffer_read_update(&impl->ring, actual_timestamp);
spa_ringbuffer_write_update(&impl->ring, actual_timestamp);
memset(impl->buffer, 0, BUFFER_SIZE);

1
src/modules/module-rtp/stream.c
View file

@ -109,6 +109,7 @@ struct impl {
uint32_t mtu;
uint32_t header_size;
uint32_t payload_size;
uint32_t ts_align;
struct spa_ringbuffer ring;
uint8_t buffer[BUFFER_SIZE];