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rtp-sap,AES67: reorder sdp records to be compatible with Dante/AES67 devices

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A software called `Dante Controller` is needed to configure Dante
devices (which also support AES67). This software is picky about the
order in which SDP records are received and parsed.

Changing the order or adding new records in between leads to faulty
display of our stream within `Dante Controller` (missing channel display
etc.) and the user is then unable to connect any Dante device to the
AES67 stream.
This commit is contained in:
Sebastian Jaeckel 2023-05-16 15:44:32 +02:00 • committed by Wim Taymans
parent 31ffa09c16
commit 39d6e40abd
1 changed files with 15 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

27
src/modules/module-rtp-sap.c
View file

@ -520,35 +520,33 @@ static int send_sap(struct impl *impl, struct session *sess, bool bye)
snprintf(dst_ttl, sizeof(dst_ttl), "/%d", sdp->ttl);
spa_strbuf_init(&buf, buffer, sizeof(buffer));
/* Don't add any sdp records in between this definition or change the order
it will break compatibility with Dante/AES67 devices. Add new records to
the end. */
spa_strbuf_append(&buf,
"v=0\n"
"o=%s %u 0 IN %s %s\n"
"s=%s\n"
"c=IN %s %s%s\n"
"t=%u 0\n"
"a=recvonly\n"
"a=tool:PipeWire %s\n"
"a=type:broadcast\n",
"m=%s %u RTP/AVP %i\n",
user_name, sdp->ntp, src_ip4 ? "IP4" : "IP6", src_addr,
sdp->session_name,
dst_ip4 ? "IP4" : "IP6", dst_addr, dst_ttl,
sdp->ntp,
pw_get_library_version());
spa_strbuf_append(&buf,
"m=%s %u RTP/AVP %i\n",
sdp->media_type,
sdp->dst_port, sdp->payload);
sdp->media_type, sdp->dst_port, sdp->payload);
if (sdp->channels) {
spa_strbuf_append(&buf,
"a=rtpmap:%i %s/%u/%u\n",
sdp->payload, sdp->mime_type,
sdp->rate, sdp->channels);
if (sdp->channelmap[0] != 0) {
spa_strbuf_append(&buf,
"i=%d channels: %s\n", sdp->channels,
sdp->channelmap);
}
spa_strbuf_append(&buf,
"a=recvonly\n"
"a=rtpmap:%i %s/%u/%u\n",
sdp->payload, sdp->mime_type,
sdp->rate, sdp->channels);
} else {
spa_strbuf_append(&buf,
"a=rtpmap:%i %s/%u\n",
@ -569,6 +567,11 @@ static int send_sap(struct impl *impl, struct session *sess, bool bye)
spa_strbuf_append(&buf, "a=mediaclk:sender\n");
}
spa_strbuf_append(&buf,
"a=tool:PipeWire %s\n"
"a=type:broadcast\n",
pw_get_library_version());
pw_log_debug("sending SAP for %u %s", sess->node->id, buffer);
iov[3].iov_base = buffer;