simulcast-answer.html (3828B)
1 <!doctype html> 2 <meta charset=utf-8> 3 <title>RTCPeerConnection Simulcast Answer</title> 4 <script src="/resources/testharness.js"></script> 5 <script src="/resources/testharnessreport.js"></script> 6 <script> 7 'use strict'; 8 9 const offer_sdp = `v=0 10 o=- 3840232462471583827 2 IN IP4 127.0.0.1 11 s=- 12 t=0 0 13 a=group:BUNDLE 0 14 a=msid-semantic: WMS 15 m=video 9 UDP/TLS/RTP/SAVPF 96 16 c=IN IP4 0.0.0.0 17 a=rtcp:9 IN IP4 0.0.0.0 18 a=ice-ufrag:Li6+ 19 a=ice-pwd:3C05CTZBRQVmGCAq7hVasHlT 20 a=ice-options:trickle 21 a=fingerprint:sha-256 5B:D3:8E:66:0E:7D:D3:F3:8E:E6:80:28:19:FC:55:AD:58:5D:B9:3D:A8:DE:45:4A:E7:87:02:F8:3C:0B:3B:B3 22 a=setup:actpass 23 a=mid:0 24 a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:mid 25 a=extmap:2 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id 26 a=recvonly 27 a=rtcp-mux 28 a=rtpmap:96 VP8/90000 29 a=rtcp-fb:96 goog-remb 30 a=rtcp-fb:96 transport-cc 31 a=rtcp-fb:96 ccm fir 32 a=rid:foo recv 33 a=rid:bar recv 34 a=rid:baz recv 35 a=simulcast:recv foo;bar;baz 36 `; 37 // Tests for the construction of answers with simulcast according to: 38 // draft-ietf-mmusic-sdp-simulcast-13 39 // draft-ietf-mmusic-rid-15 40 promise_test(async t => { 41 const pc = new RTCPeerConnection(); 42 t.add_cleanup(() => pc.close()); 43 const expected_rids = ['foo', 'bar', 'baz']; 44 45 await pc.setRemoteDescription({type: 'offer', sdp: offer_sdp}); 46 const transceiver = pc.getTransceivers()[0]; 47 // The created transceiver should be in "recvonly" state. Allow it to send. 48 transceiver.direction = 'sendonly'; 49 const answer = await pc.createAnswer(); 50 const answer_lines = answer.sdp.split('\r\n'); 51 // Check for a RID line for each layer. 52 for (const rid of expected_rids) { 53 const result = answer_lines.find(line => line.startsWith(`a=rid:${rid}`)); 54 assert_not_equals(result, undefined, `RID attribute for '${rid}' missing.`); 55 } 56 57 // Check for simulcast attribute with send direction and all RIDs. 58 const result = answer_lines.find( 59 line => line.startsWith(`a=simulcast:send ${expected_rids.join(';')}`)); 60 assert_not_equals(result, undefined, 'Could not find simulcast attribute.'); 61 }, 'createAnswer() with multiple send encodings should create simulcast answer'); 62 63 promise_test(async t => { 64 const pc = new RTCPeerConnection(); 65 t.add_cleanup(() => pc.close()); 66 const expected_rids = ['foo', 'bar', 'baz']; 67 68 // Try to disable the `bar` encoding in a=simulcast by prefixing it with the 69 // `~` character. 70 await pc.setRemoteDescription({type: 'offer', sdp: offer_sdp.replace(/(a=simulcast:.*)bar/, '$1~bar')}); 71 const transceiver = pc.getTransceivers()[0]; 72 transceiver.direction = 'sendonly'; 73 await pc.setLocalDescription(); 74 75 const parameters = pc.getSenders()[0].getParameters(); 76 const barEncoding = parameters.encodings.find(encoding => encoding.rid === 'bar'); 77 assert_not_equals(barEncoding, undefined); 78 assert_not_equals(barEncoding.active, false); 79 }, 'Using the ~rid SDP syntax in a remote offer does not control the local encodings active flag'); 80 81 promise_test(async t => { 82 const pc = new RTCPeerConnection(); 83 t.add_cleanup(() => pc.close()); 84 const expected_rids = ['foo', 'bar', 'baz']; 85 86 await pc.setRemoteDescription({type: 'offer', sdp: offer_sdp}); 87 const transceiver = pc.getTransceivers()[0]; 88 transceiver.direction = 'sendonly'; 89 await pc.setLocalDescription(); 90 91 // Disabling the encoding should not change the rid to ~rid. 92 const parameters = pc.getSenders()[0].getParameters(); 93 parameters.encodings.forEach(e => e.active = false); 94 await pc.getSenders()[0].setParameters(parameters); 95 const offer = await pc.createOffer(); 96 97 const offer_lines = offer.sdp.split('\r\n'); 98 const result = offer_lines.find( 99 line => line.startsWith(`a=simulcast:send ${expected_rids.join(';')}`)); 100 assert_not_equals(result, undefined, 'Could not find simulcast attribute.'); 101 }, 'Disabling encodings locally does not change the SDP'); 102 </script>