<!doctype html>
<meta charset=utf-8>
<meta name="variant" content="?interop-2026">
<meta name="variant" content="?rest">
<title>RTCRtpReceiver.prototype.getParameters</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="dictionary-helper.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
<script src="RTCRtpParameters-helper.js"></script>
<script>
  'use strict';
const rest = !new URLSearchParams(location.search).has("interop-2026");
const interop2026 = !new URLSearchParams(location.search).has("rest");

  // Test is based on the following editor draft:
  // https://w3c.github.io/webrtc-pc/archives/20170605/webrtc.html

  // The following helper functions are called from RTCRtpParameters-helper.js:
  //   validateReceiverRtpParameters

  /*
    Validates the RTCRtpParameters returned from RTCRtpReceiver.prototype.getParameters

    5.3.  RTCRtpReceiver Interface
      getParameters
        When getParameters is called, the RTCRtpParameters dictionary is constructed
        as follows:

        - The headerExtensions sequence is populated based on the header extensions that
          the receiver is currently prepared to receive.

        - The codecs sequence is populated based on the codecs that the receiver is currently
          prepared to receive.

        - rtcp.reducedSize is set to true if the receiver is currently prepared to receive
          reduced-size RTCP packets, and false otherwise. rtcp.cname is left undefined.
  */
if (interop2026) {
  promise_test(async t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    pc.addTransceiver('audio');
    const callee = await doOfferAnswerExchange(t, pc);
    const param = callee.getTransceivers()[0].receiver.getParameters();
    validateReceiverRtpParameters(param);

    assert_greater_than(param.headerExtensions.length, 0);
    assert_greater_than(param.codecs.length, 0);
  }, 'getParameters() with audio receiver');

  promise_test(async t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    pc.addTransceiver('video');
    const callee = await doOfferAnswerExchange(t, pc);
    const param = callee.getTransceivers()[0].receiver.getParameters();
    validateReceiverRtpParameters(param);

    assert_greater_than(param.headerExtensions.length, 0);
    assert_greater_than(param.codecs.length, 0);
  }, 'getParameters() with video receiver');
}

if (rest) {
  promise_test(async t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    pc.addTransceiver('video', {
      sendEncodings: [
        { rid: "rid1" },
        { rid: "rid2" }
      ]
    });
    const callee = await doOfferAnswerExchange(t, pc);
    const param = callee.getTransceivers()[0].receiver.getParameters();
    validateReceiverRtpParameters(param);
    assert_greater_than(param.headerExtensions.length, 0);
    assert_greater_than(param.codecs.length, 0);
  }, 'getParameters() with simulcast video receiver');
}

if (interop2026) {
  promise_test(async t => {
    const stream = await getNoiseStream({video: true});
    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
    const [track] = stream.getTracks();
    const caller = new RTCPeerConnection();
    t.add_cleanup(() => caller.close());
    caller.addTrack(track);
    const callee = new RTCPeerConnection();
    t.add_cleanup(() => callee.close());
    callee.addTrack(track);
    var callerReceiver = caller.getTransceivers()[0].receiver;
    assert_equals(callerReceiver.getParameters().codecs.length, 0);
    assert_equals(callerReceiver.getParameters().headerExtensions.length, 0,
      "no caller header extensions before offer");
    const offer = await caller.createOffer();
    await caller.setLocalDescription(offer);
    await callee.setRemoteDescription(offer);
    var calleeReceiver = callee.getTransceivers()[0].receiver;
    // Callee transceiver exists only after offer - population of parameters
    // should only occur after answer.
    assert_equals(calleeReceiver.getParameters().headerExtensions.length, 0,
      "no callee header extensions before answer");
    assert_equals(calleeReceiver.getParameters().codecs.length, 0);
    const answer = await callee.createAnswer();
    await callee.setLocalDescription(answer);
    assert_greater_than(calleeReceiver.getParameters().codecs.length, 0,
      "callee codecs after answer");
    await caller.setRemoteDescription(answer);
    assert_greater_than(callerReceiver.getParameters().codecs.length, 0,
      "caller codecs after answer");
    assert_greater_than(callerReceiver.getParameters().headerExtensions.length, 0,
      "caller header extensions after O/A");
    assert_greater_than(calleeReceiver.getParameters().headerExtensions.length, 0,
      "callee header extensions after O/A");
  }, 'getParameters() surfaces codecs on two-way receiver at the right time');
}

</script>