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janus: refactored sdp logic

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Maxim Devaev
2026-01-31 16:45:26 +02:00
parent 214708549d
commit a1ae02de5d
7 changed files with 150 additions and 76 deletions
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110
janus/src/sdp.c Normal file
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/*****************************************************************************
# #
# uStreamer - Lightweight and fast MJPEG-HTTP streamer. #
# #
# Copyright (C) 2018-2024 Maxim Devaev <mdevaev@gmail.com> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
*****************************************************************************/
#include "sdp.h"
#include <inttypes.h>
#include <janus/plugins/plugin.h>
#include "uslibs/types.h"
#include "uslibs/tools.h"
#include "rtp.h"
#include "rtpv.h"
#include "rtpa.h"
char *us_sdp_create(us_rtpv_s *rtpv, us_rtpa_s *rtpa, bool mic) {
char *video_sdp;
{
// https://tools.ietf.org/html/rfc6184
// https://github.com/meetecho/janus-gateway/issues/2443
const uint pl = rtpv->rtp->payload;
US_ASPRINTF(
video_sdp,
"m=video 1 RTP/SAVPF %u" RN
"c=IN IP4 0.0.0.0" RN
"a=rtpmap:%u H264/90000" RN
"a=fmtp:%u profile-level-id=42E01F;packetization-mode=1" RN
"a=rtcp-fb:%u nack" RN
"a=rtcp-fb:%u nack pli" RN
"a=rtcp-fb:%u goog-remb" RN
"a=mid:v" RN
"a=msid:video v" RN
"a=ssrc:%" PRIu32 " cname:ustreamer" RN
"a=extmap:1/sendonly urn:3gpp:video-orientation" RN
"a=extmap:2/sendonly http://www.webrtc.org/experiments/rtp-hdrext/playout-delay" 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);
}
char *audio_sdp;
if (rtpa == NULL) {
audio_sdp = us_strdup("");
} else {
const uint pl = rtpa->rtp->payload;
US_ASPRINTF(
audio_sdp,
"m=audio 1 RTP/SAVPF %u" RN
"c=IN IP4 0.0.0.0" RN
"a=rtpmap:%u OPUS/%u/%u" RN
"a=fmtp:%u sprop-stereo=1" RN // useinbandfec=1
"a=rtcp-fb:%u nack" RN
"a=rtcp-fb:%u nack pli" RN
"a=rtcp-fb:%u goog-remb" RN
"a=mid:a" RN
"a=msid:audio a" RN
"a=ssrc:%" PRIu32 " cname:ustreamer" RN
"a=%s" RN,
pl, pl,
US_RTP_OPUS_HZ, US_RTP_OPUS_CH,
pl, pl, pl, pl,
rtpa->rtp->ssrc,
(mic ? "sendrecv" : "sendonly"));
}
char *sdp;
US_ASPRINTF(sdp,
"v=0" RN
"o=- %" PRIu64 " 1 IN IP4 0.0.0.0" RN
"s=PiKVM uStreamer" RN
"t=0 0" RN
"%s%s",
us_get_now_id() >> 1,
# if JANUS_PLUGIN_API_VERSION >= 100
// Place video SDP before audio SDP so that the video and audio streams
// have predictable indices, even if audio is not available.
// See also client.c.
video_sdp, audio_sdp
# else
// For versions of Janus prior to 1.x, place the audio SDP first.
audio_sdp, video_sdp
# endif
);
free(audio_sdp);
free(video_sdp);
return sdp;
}