msid-generate.html

<!doctype html>

<meta charset=utf-8>

<title>RTCPeerconnection MSID generation</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="../RTCPeerConnection-helper.js"></script>

<script src="../third_party/sdp/sdp.js"></script>

<script>

function msidLines(desc) {

  const sections = SDPUtils.splitSections(desc.sdp);

  return SDPUtils.matchPrefix(sections[1], 'a=msid:');

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const dc = pc.createDataChannel('foo');

  const desc = await pc.createOffer();

  assert_equals(msidLines(desc).length, 0);

}, 'No media track produces no MSID');

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const stream1 = await getNoiseStream({audio: true});

  pc.addTrack(stream1.getTracks()[0]);

  const desc = await pc.createOffer();

  const msid_lines = msidLines(desc);

  assert_equals(msid_lines.length, 1);

  assert_regexp_match(msid_lines[0], /^a=msid:-/);

}, 'AddTrack without a stream produces MSID with no stream ID');

// token-char from RFC 4566

// This is printable characters except whitespace, and ["(),/:;<=>?@[\]]

const token_char = '\\x21\\x23-\\x27\\x2A-\\x2B\\x2D-\\x2E\\x30-\\x39\\x41-\\x5A\\x5E-\\x7E';

// msid-value from RFC 8830

const msid_attr = RegExp(`^a=msid:[${token_char}]{1,64}( [${token_char}]{1,64})?$`);

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const stream1 = await getNoiseStream({audio: true});

  pc.addTrack(stream1.getTracks()[0], stream1);

  const desc = await pc.createOffer();

  const msid_lines = msidLines(desc);

  assert_equals(msid_lines.length, 1);

  assert_regexp_match(msid_lines[0], msid_attr);

}, 'AddTrack with a stream produces MSID with a stream ID');

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const stream1 = await getNoiseStream({audio: true});

  const stream2 = new MediaStream(stream1.getTracks());

  pc.addTrack(stream1.getTracks()[0], stream1, stream2);

  const desc = await pc.createOffer();

  const msid_lines = msidLines(desc);

  assert_equals(msid_lines.length, 2);

  assert_regexp_match(msid_lines[0], msid_attr);

  assert_regexp_match(msid_lines[1], msid_attr);

}, 'AddTrack with two streams produces two MSID lines');

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const stream1 = await getNoiseStream({audio: true});

  pc.addTrack(stream1.getTracks()[0], stream1, stream1);

  const desc = await pc.createOffer();

  const msid_lines = msidLines(desc);

  assert_equals(msid_lines.length, 1);

  assert_regexp_match(msid_lines[0], msid_attr);

}, 'AddTrack with the stream twice produces single MSID with a stream ID');

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const stream1 = await getNoiseStream({audio: true});

  pc.addTransceiver(stream1.getTracks()[0]);

  const desc = await pc.createOffer();

  const msid_lines = msidLines(desc);

  assert_equals(msid_lines.length, 1);

  assert_regexp_match(msid_lines[0], /^a=msid:-/);

}, 'AddTransceiver without a stream produces MSID with no stream ID');

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const stream1 = await getNoiseStream({audio: true});

  pc.addTransceiver(stream1.getTracks()[0], {streams: [stream1]});

  const desc = await pc.createOffer();

  const msid_lines = msidLines(desc);

  assert_equals(msid_lines.length, 1);

  assert_regexp_match(msid_lines[0], msid_attr);

}, 'AddTransceiver with a stream produces MSID with a stream ID');

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const stream1 = await getNoiseStream({audio: true});

  const stream2 = new MediaStream(stream1.getTracks());

  pc.addTransceiver(stream1.getTracks()[0], {streams: [stream1, stream2]});

  const desc = await pc.createOffer();

  const msid_lines = msidLines(desc);

  assert_equals(msid_lines.length, 2);

  assert_regexp_match(msid_lines[0], msid_attr);

  assert_regexp_match(msid_lines[1], msid_attr);

}, 'AddTransceiver with two streams produces two MSID lines');

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const stream1 = await getNoiseStream({audio: true});

  pc.addTransceiver(stream1.getTracks()[0], {streams: [stream1, stream1]});

const desc = await pc.createOffer();

  const msid_lines = msidLines(desc);

  assert_equals(msid_lines.length, 1);

  assert_regexp_match(msid_lines[0], msid_attr);

}, 'AddTransceiver with the stream twice produces single MSID with a stream ID');

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const stream1 = await getNoiseStream({audio: true});

  const {sender} = pc.addTransceiver(stream1.getTracks()[0]);

  sender.setStreams(stream1);

  const desc = await pc.createOffer();

  const msid_lines = msidLines(desc);

  assert_equals(msid_lines.length, 1);

  assert_regexp_match(msid_lines[0], msid_attr);

}, 'SetStreams with a stream produces MSID with a stream ID');

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const stream1 = await getNoiseStream({audio: true});

  const stream2 = new MediaStream(stream1.getTracks());

  const {sender} = pc.addTransceiver(stream1.getTracks()[0]);

  sender.setStreams(stream1, stream2);

  const desc = await pc.createOffer();

  const msid_lines = msidLines(desc);

  assert_equals(msid_lines.length, 2);

  assert_regexp_match(msid_lines[0], msid_attr);

  assert_regexp_match(msid_lines[1], msid_attr);

}, 'SetStreams with two streams produces two MSID lines');

promise_test(async t => {

  const pc = new RTCPeerConnection();

  t.add_cleanup(() => pc.close());

  const stream1 = await getNoiseStream({audio: true});

  const {sender} = pc.addTransceiver(stream1.getTracks()[0]);

  sender.setStreams(stream1, stream1);

  const desc = await pc.createOffer();

  const msid_lines = msidLines(desc);

  assert_equals(msid_lines.length, 1);

  assert_regexp_match(msid_lines[0], msid_attr);

}, 'SetStreams with the stream twice produces single MSID with a stream ID');

</script>