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Janus: "Absolute Capture Time" RTP extension added (#320)

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for video.
This commit is contained in:
Sergey Radionov
2026-01-28 14:59:01 +07:00
committed by GitHub
parent 8adca998e9
commit 3b7592bb31
4 changed files with 14 additions and 0 deletions
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2
janus/src/client.c
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@@ -205,6 +205,8 @@ static void *_video_or_acap_thread(void *v_client, bool video) {
}
if (rtp.video) {
packet.extensions.abs_capture_ts = rtp.grab_ntp_ts;
uint video_orient = atomic_load(&client->video_orient);
if (video_orient != 0) {
// The extension rotates the video clockwise, but want it counterclockwise.

1
janus/src/rtp.h
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@@ -46,6 +46,7 @@ typedef struct {
u8 datagram[US_RTP_DATAGRAM_SIZE];
uz used;
bool zero_playout_delay;
u64 grab_ntp_ts;
} us_rtp_s;
typedef void (*us_rtp_callback_f)(const us_rtp_s *rtp);

3
janus/src/rtpv.c
View File

@@ -73,6 +73,7 @@ char *us_rtpv_make_sdp(us_rtpv_s *rtpv) {
"a=ssrc:%" PRIu32 " cname:ustreamer" RN
"a=extmap:1 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay" RN
"a=extmap:2 urn:3gpp:video-orientation" RN
"a=extmap:3/sendonly http://www.webrtc.org/experiments/rtp-hdrext/abs-capture-time" RN
"a=sendonly" RN,
pl, pl, pl, pl, pl, pl,
rtpv->rtp->ssrc
@@ -89,6 +90,8 @@ void us_rtpv_wrap(us_rtpv_s *rtpv, const us_frame_s *frame, bool zero_playout_de
assert(frame->format == V4L2_PIX_FMT_H264);
rtpv->rtp->zero_playout_delay = zero_playout_delay;
rtpv->rtp->grab_ntp_ts =
us_get_now_ntp() - (us_get_now_monotonic() - frame->grab_begin_ts) * NTP_TICKS_IN_SECOND;
const u32 pts = us_get_now_monotonic_u64() * 9 / 100; // PTS units are in 90 kHz
sz last_offset = -_PRE;