RTCRtpParameters-scalability.html

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This WPT test may be referenced by the following Test IDs:
- /webrtc-svc/RTCRtpParameters-scalability.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset=utf-8>

<meta name="timeout" content="long">

<title>RTCRtpParameters encodings</title>

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

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

<script src="/webrtc/dictionary-helper.js"></script>

<script src="/webrtc/RTCRtpParameters-helper.js"></script>

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

<script>

  'use strict';

  // Test is based on the following editor draft:

  // https://w3c.github.io/webrtc-svc/

  promise_test(async t => {

    const pc = new RTCPeerConnection();

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

    const { sender } = pc.addTransceiver('video', {

      sendEncodings: [{scalabilityMode: 'L1T3'}],

});

    const param = sender.getParameters();

    const encoding = param.encodings[0];

    assert_equals(encoding.scalabilityMode, 'L1T3');

    encoding.scalabilityMode = 'L1T2';

    await sender.setParameters(param);

    const updatedParam = sender.getParameters();

    const updatedEncoding = updatedParam.encodings[0];

    assert_equals(updatedEncoding.scalabilityMode, 'L1T2');

  }, `Setting and updating scalabilityMode to a legal value should be accepted`);

  promise_test(async t => {

    const pc = new RTCPeerConnection();

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

    const { sender } = pc.addTransceiver('video');

    const param = sender.getParameters();

    const encoding = param.encodings[0];

    assert_true(!('scalabilityMode' in encoding));

  }, 'Not setting sendEncodings results in no mode info before negotiation');

  promise_test(async t => {

    const pc = new RTCPeerConnection();

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

    const { sender } = pc.addTransceiver('video', {

      sendEncodings: [{}],

});

    const param = sender.getParameters();

    const encoding = param.encodings[0];

    assert_true(!('scalabilityMode' in encoding));

  }, 'Not setting a scalability mode results in no mode set before negotiation');

  promise_test(async t => {

      const pc = new RTCPeerConnection();

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

    assert_throws_dom('OperationError', () => {

      pc.addTransceiver('video', {

        sendEncodings: [{scalabilityMode: 'TotalNonsense'}],

});

});

  }, 'Setting a scalability mode to nonsense throws an exception');

  promise_test(async t => {

    const v = document.createElement('video');

    v.autoplay = true;

    const pc1 = new RTCPeerConnection();

    const pc2 = new RTCPeerConnection();

    t.add_cleanup(() => pc1.close());

    t.add_cleanup(() => pc2.close());

    const transceiver = pc1.addTransceiver('video', {

      sendEncodings: [{ scalabilityMode: 'L3T3' }],

});

    // Before negotiation, the mode should be preserved.

    const param = transceiver.sender.getParameters();

    const encoding = param.encodings[0];

    assert_true('scalabilityMode' in encoding);

    // If L3T3 is not supported at all, abort test.

    assert_implements_optional(encoding.scalabilityMode === 'L3T3');

    pc2.ontrack = e => {

      // Pick a codec known to not have L3T3 support.

      const capabilities = RTCRtpReceiver.getCapabilities('video');

      const codec = capabilities.codecs.find(c => c.mimeType === 'video/VP8');

      assert_true(codec !== undefined);

      e.transceiver.setCodecPreferences([codec]);

    exchangeIceCandidates(pc1, pc2);

    await exchangeOfferAnswer(pc1, pc2);

    const sendParams = pc1.getSenders()[0].getParameters();

    assert_not_equals(sendParams.encodings[0].scalabilityMode, 'L3T3');

  }, 'L3T3 on VP8 should return something other than L3T3');

</script>