Source code
Revision control
Copy as Markdown
Other Tools
Test Info:
<!DOCTYPE HTML>
<html>
<head>
<script type="application/javascript" src="pc.js"></script>
<script type="application/javascript" src="iceTestUtils.js"></script>
</head>
<body>
<pre id="test">
<script type="application/javascript">
createHTML({
bug: "1799932",
title: "RTCPeerConnection check renegotiation of extmap"
});
function setExtmap(sdp, uri, id) {
const regex = new RegExp(`a=extmap:[0-9]+(\/[a-z]+)? ${uri}`, 'g');
if (id) {
return sdp.replaceAll(regex, `a=extmap:${id}$1 ${uri}`);
} else {
return sdp.replaceAll(regex, `a=unknownattr`);
}
}
function getExtmap(sdp, uri) {
const regex = new RegExp(`a=extmap:([0-9]+)(\/[a-z]+)? ${uri}`);
return sdp.match(regex)[1];
}
function replaceExtUri(sdp, oldUri, newUri) {
const regex = new RegExp(`(a=extmap:[0-9]+\/[a-z]+)? ${oldUri}`, 'g');
return sdp.replaceAll(regex, `$1 ${newUri}`);
}
const tests = [
async function checkAudioMidChange() {
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
const stream = await navigator.mediaDevices.getUserMedia({audio: true});
pc1.addTrack(stream.getTracks()[0]);
pc2.addTrack(stream.getTracks()[0]);
await connect(pc1, pc2, 32000, "Initial connection");
// Sadly, there's no way to tell the offerer to change the extmap. Other
// types of endpoint could conceivably do this, so we at least don't want
// to crash.
// TODO: Would be nice to be able to test this with an endpoint that
// actually changes the ids it uses.
const reoffer = await pc1.createOffer();
reoffer.sdp = setExtmap(reoffer.sdp, "urn:ietf:params:rtp-hdrext:sdes:mid", 14);
info(`New reoffer: ${reoffer.sdp}`);
await pc2.setRemoteDescription(reoffer);
await pc2.setLocalDescription();
await wait(2000);
},
async function checkVideoMidChange() {
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
const stream = await navigator.mediaDevices.getUserMedia({video: true});
pc1.addTrack(stream.getTracks()[0]);
pc2.addTrack(stream.getTracks()[0]);
await connect(pc1, pc2, 32000, "Initial connection");
// Sadly, there's no way to tell the offerer to change the extmap. Other
// types of endpoint could conceivably do this, so we at least don't want
// to crash.
// TODO: Would be nice to be able to test this with an endpoint that
// actually changes the ids it uses.
const reoffer = await pc1.createOffer();
reoffer.sdp = setExtmap(reoffer.sdp, "urn:ietf:params:rtp-hdrext:sdes:mid", 14);
info(`New reoffer: ${reoffer.sdp}`);
await pc2.setRemoteDescription(reoffer);
await pc2.setLocalDescription();
await wait(2000);
},
async function checkAudioMidSwap() {
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
const stream = await navigator.mediaDevices.getUserMedia({audio: true});
pc1.addTrack(stream.getTracks()[0]);
pc2.addTrack(stream.getTracks()[0]);
await connect(pc1, pc2, 32000, "Initial connection");
// Sadly, there's no way to tell the offerer to change the extmap. Other
// types of endpoint could conceivably do this, so we at least don't want
// to crash.
// TODO: Would be nice to be able to test this with an endpoint that
// actually changes the ids it uses.
const reoffer = await pc1.createOffer();
const midId = getExtmap(reoffer.sdp, "urn:ietf:params:rtp-hdrext:sdes:mid");
const ssrcLevelId = getExtmap(reoffer.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level");
reoffer.sdp = setExtmap(reoffer.sdp, "urn:ietf:params:rtp-hdrext:sdes:mid", ssrcLevelId);
reoffer.sdp = setExtmap(reoffer.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level", midId);
info(`New reoffer: ${reoffer.sdp}`);
try {
await pc2.setRemoteDescription(reoffer);
ok(false, "sRD should fail when it attempts extension id remapping");
} catch (e) {
ok(true, "sRD should fail when it attempts extension id remapping");
}
},
async function checkVideoMidSwap() {
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
const stream = await navigator.mediaDevices.getUserMedia({video: true});
pc1.addTrack(stream.getTracks()[0]);
pc2.addTrack(stream.getTracks()[0]);
await connect(pc1, pc2, 32000, "Initial connection");
// Sadly, there's no way to tell the offerer to change the extmap. Other
// types of endpoint could conceivably do this, so we at least don't want
// to crash.
// TODO: Would be nice to be able to test this with an endpoint that
// actually changes the ids it uses.
const reoffer = await pc1.createOffer();
const midId = getExtmap(reoffer.sdp, "urn:ietf:params:rtp-hdrext:sdes:mid");
const toffsetId = getExtmap(reoffer.sdp, "urn:ietf:params:rtp-hdrext:toffset");
reoffer.sdp = setExtmap(reoffer.sdp, "urn:ietf:params:rtp-hdrext:sdes:mid", toffsetId);
reoffer.sdp = setExtmap(reoffer.sdp, "urn:ietf:params:rtp-hdrext:toffset", midId);
info(`New reoffer: ${reoffer.sdp}`);
try {
await pc2.setRemoteDescription(reoffer);
ok(false, "sRD should fail when it attempts extension id remapping");
} catch (e) {
ok(true, "sRD should fail when it attempts extension id remapping");
}
},
async function checkAudioIdReuse() {
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
const stream = await navigator.mediaDevices.getUserMedia({audio: true});
pc1.addTrack(stream.getTracks()[0]);
pc2.addTrack(stream.getTracks()[0]);
await connect(pc1, pc2, 32000, "Initial connection");
// Sadly, there's no way to tell the offerer to change the extmap. Other
// types of endpoint could conceivably do this, so we at least don't want
// to crash.
// TODO: Would be nice to be able to test this with an endpoint that
// actually changes the ids it uses.
const reoffer = await pc1.createOffer();
// Change uri, but not the id, so the id now refers to foo.
reoffer.sdp = replaceExtUri(reoffer.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level", "foo");
info(`New reoffer: ${reoffer.sdp}`);
try {
await pc2.setRemoteDescription(reoffer);
ok(false, "sRD should fail when it attempts extension id remapping");
} catch (e) {
ok(true, "sRD should fail when it attempts extension id remapping");
}
},
async function checkVideoIdReuse() {
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
const stream = await navigator.mediaDevices.getUserMedia({video: true});
pc1.addTrack(stream.getTracks()[0]);
pc2.addTrack(stream.getTracks()[0]);
await connect(pc1, pc2, 32000, "Initial connection");
// Sadly, there's no way to tell the offerer to change the extmap. Other
// types of endpoint could conceivably do this, so we at least don't want
// to crash.
// TODO: Would be nice to be able to test this with an endpoint that
// actually changes the ids it uses.
const reoffer = await pc1.createOffer();
// Change uri, but not the id, so the id now refers to foo.
reoffer.sdp = replaceExtUri(reoffer.sdp, "urn:ietf:params:rtp-hdrext:toffset", "foo");
info(`New reoffer: ${reoffer.sdp}`);
try {
await pc2.setRemoteDescription(reoffer);
ok(false, "sRD should fail when it attempts extension id remapping");
} catch (e) {
ok(true, "sRD should fail when it attempts extension id remapping");
}
},
// What happens when remote answer uses an extmap id, and then a remote
// reoffer tries to use the same id for something else?
async function checkAudioIdReuseOffererThenAnswerer() {
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
const stream = await navigator.mediaDevices.getUserMedia({audio: true});
pc1.addTrack(stream.getTracks()[0]);
pc2.addTrack(stream.getTracks()[0]);
await connect(pc1, pc2, 32000, "Initial connection");
const reoffer = await pc2.createOffer();
// Change uri, but not the id, so the id now refers to foo.
reoffer.sdp = replaceExtUri(reoffer.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level", "foo");
info(`New reoffer: ${reoffer.sdp}`);
try {
await pc1.setRemoteDescription(reoffer);
ok(false, "sRD should fail when it attempts extension id remapping");
} catch (e) {
ok(true, "sRD should fail when it attempts extension id remapping");
}
},
// What happens when a remote offer uses a different extmap id than the
// default? Does the answerer remember the new id in reoffers?
async function checkAudioIdReuseOffererThenAnswerer() {
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
const stream = await navigator.mediaDevices.getUserMedia({audio: true});
pc1.addTrack(stream.getTracks()[0]);
pc2.addTrack(stream.getTracks()[0]);
// Negotiate, but change id for ssrc-audio-level to something pc2 would
// not typically use.
await pc1.setLocalDescription();
const mungedOffer = setExtmap(pc1.localDescription.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level", 12);
await pc2.setRemoteDescription({sdp: mungedOffer, type: "offer"});
await pc2.setLocalDescription();
const reoffer = await pc2.createOffer();
is(getExtmap(reoffer.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level"), "12");
},
async function checkAudioUnnegotiatedIdReuse1() {
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
const stream = await navigator.mediaDevices.getUserMedia({audio: true});
pc1.addTrack(stream.getTracks()[0]);
pc2.addTrack(stream.getTracks()[0]);
// Negotiate, but remove ssrc-audio-level from answer
await pc1.setLocalDescription();
const levelId = getExtmap(pc1.localDescription.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level");
await pc2.setRemoteDescription(pc1.localDescription);
await pc2.setLocalDescription();
const answerNoExt = setExtmap(pc2.localDescription.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level", undefined);
await pc1.setRemoteDescription({sdp: answerNoExt, type: "answer"});
// Renegotiate, and use the id that offerer used for ssrc-audio-level for
// something different (while making sure we don't use it twice)
await pc2.setLocalDescription();
const mungedReoffer = setExtmap(pc2.localDescription.sdp, "urn:ietf:params:rtp-hdrext:sdes:mid", levelId);
const twiceMungedReoffer = setExtmap(mungedReoffer, "urn:ietf:params:rtp-hdrext:ssrc-audio-level", undefined);
await pc1.setRemoteDescription({sdp: twiceMungedReoffer, type: "offer"});
},
async function checkAudioUnnegotiatedIdReuse2() {
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
const stream = await navigator.mediaDevices.getUserMedia({audio: true});
pc1.addTrack(stream.getTracks()[0]);
pc2.addTrack(stream.getTracks()[0]);
// Negotiate, but remove ssrc-audio-level from offer. pc2 has never seen
// |levelId| in extmap yet, but internally probably wants to use that for
// ssrc-audio-level
await pc1.setLocalDescription();
const levelId = getExtmap(pc1.localDescription.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level");
const offerNoExt = setExtmap(pc1.localDescription.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level", undefined);
await pc2.setRemoteDescription({sdp: offerNoExt, type: "offer"});
await pc2.setLocalDescription();
await pc1.setRemoteDescription(pc2.localDescription);
// Renegotiate, but use |levelId| for something other than
// ssrc-audio-level. pc2 should not throw.
await pc1.setLocalDescription();
const mungedReoffer = setExtmap(pc1.localDescription.sdp, "urn:ietf:params:rtp-hdrext:sdes:mid", levelId);
const twiceMungedReoffer = setExtmap(mungedReoffer, "urn:ietf:params:rtp-hdrext:ssrc-audio-level", undefined);
await pc2.setRemoteDescription({sdp: twiceMungedReoffer, type: "offer"});
},
async function checkAudioUnnegotiatedIdReuse3() {
const pc1 = new RTCPeerConnection();
const pc2 = new RTCPeerConnection();
const stream = await navigator.mediaDevices.getUserMedia({audio: true});
pc1.addTrack(stream.getTracks()[0]);
pc2.addTrack(stream.getTracks()[0]);
// Negotiate, but replace ssrc-audio-level with something pc2 won't
// support in offer.
await pc1.setLocalDescription();
const levelId = getExtmap(pc1.localDescription.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level");
const mungedOffer = replaceExtUri(pc1.localDescription.sdp, "urn:ietf:params:rtp-hdrext:ssrc-audio-level", "fooba");
await pc2.setRemoteDescription({sdp: mungedOffer, type: "offer"});
await pc2.setLocalDescription();
await pc1.setRemoteDescription(pc2.localDescription);
// Renegotiate, and use levelId for something pc2 _will_ support.
await pc1.setLocalDescription();
const mungedReoffer = setExtmap(pc1.localDescription.sdp, "urn:ietf:params:rtp-hdrext:sdes:mid", levelId);
const twiceMungedReoffer = setExtmap(mungedReoffer, "urn:ietf:params:rtp-hdrext:ssrc-audio-level", undefined);
await pc2.setRemoteDescription({sdp: twiceMungedReoffer, type: "offer"});
},
];
runNetworkTest(async () => {
for (const test of tests) {
info(`Running test: ${test.name}`);
await test();
info(`Done running test: ${test.name}`);
}
});
</script>
</pre>
</body>
</html>