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webrtc: fix codec collision in Chrome (#4394)

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Fix error "A BUNDLE group contains a codec collision for
payload_type='96. All codecs must share the same type, encoding name,
clock rate and parameters. (INVALID_PARAMETER)"
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Alessandro Ros 2025-04-04 14:31:37 +02:00 • committed by GitHub
parent a05da3a205
commit 848a8b1031
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GPG key ID: B5690EEEBB952194
1 changed files with 30 additions and 23 deletions
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53
internal/servers/webrtc/reader.js
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@ -95,25 +95,28 @@
return ret;
};
const findFreePayloadType = (firstLine) => {
const payloadTypes = firstLine.split(' ').slice(3);
for (let i = 96; i <= 127; i++) {
if (!payloadTypes.includes(i.toString())) {
return i.toString();
const reservePayloadType = (payloadTypes) => {
// everything is valid between 30 and 127, except for interval between 64 and 95
// https://chromium.googlesource.com/external/webrtc/+/refs/heads/master/call/payload_type.h#29
for (let i = 30; i <= 127; i++) {
if ((i <= 63 || i >= 96) && !payloadTypes.includes(i.toString())) {
const pl = i.toString();
payloadTypes.push(pl);
return pl;
}
}
throw Error('unable to find a free payload type');
};
const enableStereoPcmau = (section) => {
const enableStereoPcmau = (payloadTypes, section) => {
let lines = section.split('\r\n');
let payloadType = findFreePayloadType(lines[0]);
let payloadType = reservePayloadType(payloadTypes);
lines[0] += ` ${payloadType}`;
lines.splice(lines.length - 1, 0, `a=rtpmap:${payloadType} PCMU/8000/2`);
lines.splice(lines.length - 1, 0, `a=rtcp-fb:${payloadType} transport-cc`);
payloadType = findFreePayloadType(lines[0]);
payloadType = reservePayloadType(payloadTypes);
lines[0] += ` ${payloadType}`;
lines.splice(lines.length - 1, 0, `a=rtpmap:${payloadType} PCMA/8000/2`);
lines.splice(lines.length - 1, 0, `a=rtcp-fb:${payloadType} transport-cc`);
@ -121,40 +124,40 @@
return lines.join('\r\n');
};
const enableMultichannelOpus = (section) => {
const enableMultichannelOpus = (payloadTypes, section) => {
let lines = section.split('\r\n');
let payloadType = findFreePayloadType(lines[0]);
let payloadType = reservePayloadType(payloadTypes);
lines[0] += ` ${payloadType}`;
lines.splice(lines.length - 1, 0, `a=rtpmap:${payloadType} multiopus/48000/3`);
lines.splice(lines.length - 1, 0, `a=fmtp:${payloadType} channel_mapping=0,2,1;num_streams=2;coupled_streams=1`);
lines.splice(lines.length - 1, 0, `a=rtcp-fb:${payloadType} transport-cc`);
payloadType = findFreePayloadType(lines[0]);
payloadType = reservePayloadType(payloadTypes);
lines[0] += ` ${payloadType}`;
lines.splice(lines.length - 1, 0, `a=rtpmap:${payloadType} multiopus/48000/4`);
lines.splice(lines.length - 1, 0, `a=fmtp:${payloadType} channel_mapping=0,1,2,3;num_streams=2;coupled_streams=2`);
lines.splice(lines.length - 1, 0, `a=rtcp-fb:${payloadType} transport-cc`);
payloadType = findFreePayloadType(lines[0]);
payloadType = reservePayloadType(payloadTypes);
lines[0] += ` ${payloadType}`;
lines.splice(lines.length - 1, 0, `a=rtpmap:${payloadType} multiopus/48000/5`);
lines.splice(lines.length - 1, 0, `a=fmtp:${payloadType} channel_mapping=0,4,1,2,3;num_streams=3;coupled_streams=2`);
lines.splice(lines.length - 1, 0, `a=rtcp-fb:${payloadType} transport-cc`);
payloadType = findFreePayloadType(lines[0]);
payloadType = reservePayloadType(payloadTypes);
lines[0] += ` ${payloadType}`;
lines.splice(lines.length - 1, 0, `a=rtpmap:${payloadType} multiopus/48000/6`);
lines.splice(lines.length - 1, 0, `a=fmtp:${payloadType} channel_mapping=0,4,1,2,3,5;num_streams=4;coupled_streams=2`);
lines.splice(lines.length - 1, 0, `a=rtcp-fb:${payloadType} transport-cc`);
payloadType = findFreePayloadType(lines[0]);
payloadType = reservePayloadType(payloadTypes);
lines[0] += ` ${payloadType}`;
lines.splice(lines.length - 1, 0, `a=rtpmap:${payloadType} multiopus/48000/7`);
lines.splice(lines.length - 1, 0, `a=fmtp:${payloadType} channel_mapping=0,4,1,2,3,5,6;num_streams=4;coupled_streams=4`);
lines.splice(lines.length - 1, 0, `a=rtcp-fb:${payloadType} transport-cc`);
payloadType = findFreePayloadType(lines[0]);
payloadType = reservePayloadType(payloadTypes);
lines[0] += ` ${payloadType}`;
lines.splice(lines.length - 1, 0, `a=rtpmap:${payloadType} multiopus/48000/8`);
lines.splice(lines.length - 1, 0, `a=fmtp:${payloadType} channel_mapping=0,6,1,4,5,2,3,7;num_streams=5;coupled_streams=4`);
@ -163,20 +166,20 @@
return lines.join('\r\n');
};
const enableL16 = (section) => {
const enableL16 = (payloadTypes, section) => {
let lines = section.split('\r\n');
let payloadType = findFreePayloadType(lines[0]);
let payloadType = reservePayloadType(payloadTypes);
lines[0] += ` ${payloadType}`;
lines.splice(lines.length - 1, 0, `a=rtpmap:${payloadType} L16/8000/2`);
lines.splice(lines.length - 1, 0, `a=rtcp-fb:${payloadType} transport-cc`);
payloadType = findFreePayloadType(lines[0]);
payloadType = reservePayloadType(payloadTypes);
lines[0] += ` ${payloadType}`;
lines.splice(lines.length - 1, 0, `a=rtpmap:${payloadType} L16/16000/2`);
lines.splice(lines.length - 1, 0, `a=rtcp-fb:${payloadType} transport-cc`);
payloadType = findFreePayloadType(lines[0]);
payloadType = reservePayloadType(payloadTypes);
lines[0] += ` ${payloadType}`;
lines.splice(lines.length - 1, 0, `a=rtpmap:${payloadType} L16/48000/2`);
lines.splice(lines.length - 1, 0, `a=rtcp-fb:${payloadType} transport-cc`);
@ -216,18 +219,22 @@
const editOffer = (sdp, nonAdvertisedCodecs) => {
const sections = sdp.split('m=');
for (let i = 0; i < sections.length; i++) {
const payloadTypes = sections.slice(1)
.map((s) => s.split('\r\n')[0].split(' ').slice(3))
.reduce((prev, cur) => [...prev, ...cur], []);
for (let i = 1; i < sections.length; i++) {
if (sections[i].startsWith('audio')) {
sections[i] = enableStereoOpus(sections[i]);
if (nonAdvertisedCodecs.includes('pcma/8000/2')) {
sections[i] = enableStereoPcmau(sections[i]);
sections[i] = enableStereoPcmau(payloadTypes, sections[i]);
}
if (nonAdvertisedCodecs.includes('multiopus/48000/6')) {
sections[i] = enableMultichannelOpus(sections[i]);
sections[i] = enableMultichannelOpus(payloadTypes, sections[i]);
}
if (nonAdvertisedCodecs.includes('L16/48000/2')) {
sections[i] = enableL16(sections[i]);
sections[i] = enableL16(payloadTypes, sections[i]);
}
break;