test_peerConnection_scaleResolution.html

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<head>

  <script type="application/javascript" src="pc.js"></script>

</head>

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<pre id="test">

<script type="application/javascript">

  createHTML({

    bug: "1244913",

    title: "Scale resolution down on a PeerConnection",

    visible: true

});

  async function checkForH264Support() {

    const pc = new RTCPeerConnection();

    const offer = await pc.createOffer({offerToReceiveVideo: true});

    return offer.sdp.match(/a=rtpmap:[1-9][0-9]* H264/);

  let resolutionAlignment = 1;

  var mustRejectWith = (msg, reason, f) =>

    f().then(() => ok(false, msg),

             e => is(e.name, reason, msg));

  async function testScale(codec) {

    var pc1 = new RTCPeerConnection();

    var pc2 = new RTCPeerConnection();

    var add = (pc, can, failed) => can && pc.addIceCandidate(can).catch(failed);

    pc1.onicecandidate = e => add(pc2, e.candidate, generateErrorCallback());

    pc2.onicecandidate = e => add(pc1, e.candidate, generateErrorCallback());

    info("testing scaling with " + codec);

    let stream = await navigator.mediaDevices.getUserMedia({ video: true });

    var v1 = createMediaElement('video', 'v1');

    var v2 = createMediaElement('video', 'v2');

    var ontrackfired = new Promise(resolve => pc2.ontrack = e => resolve(e));

    var v2loadedmetadata = new Promise(resolve => v2.onloadedmetadata = resolve);

    is(v2.currentTime, 0, "v2.currentTime is zero at outset");

    v1.srcObject = stream;

    var sender = pc1.addTrack(stream.getVideoTracks()[0], stream);

    let parameters = sender.getParameters();

    is(parameters.encodings.length, 1, "Default number of encodings should be 1");

    parameters.encodings[0].scaleResolutionDownBy = 0.5;

    await mustRejectWith(

        "Invalid scaleResolutionDownBy must reject", "RangeError",

        () => sender.setParameters(parameters)

);

    parameters = sender.getParameters();

    parameters.encodings[0].scaleResolutionDownBy = 2;

    parameters.encodings[0].maxBitrate = 60000;

    await sender.setParameters(parameters);

    parameters = sender.getParameters();

    is(parameters.encodings[0].scaleResolutionDownBy, 2, "Should be able to set scaleResolutionDownBy");

    is(parameters.encodings[0].maxBitrate, 60000, "Should be able to set maxBitrate");

    let offer = await pc1.createOffer();

    if (codec == "VP8") {

      offer.sdp = sdputils.removeAllButPayloadType(offer.sdp, 126);

    await pc1.setLocalDescription(offer);

    await pc2.setRemoteDescription(pc1.localDescription);

    let answer = await pc2.createAnswer();

    await pc2.setLocalDescription(answer);

    await pc1.setRemoteDescription(pc2.localDescription);

    let trackevent = await ontrackfired;

    v2.srcObject = trackevent.streams[0];

    await v2loadedmetadata;

    await waitUntil(() => v2.currentTime > 0);

    ok(v2.currentTime > 0, "v2.currentTime is moving (" + v2.currentTime + ")");

    ok(v1.videoWidth > 0, "source width is positive");

    ok(v1.videoHeight > 0, "source height is positive");

    const expectedWidth =

      v1.videoWidth / 2 - (v1.videoWidth / 2 % resolutionAlignment);

    const expectedHeight =

      v1.videoHeight / 2 - (v1.videoHeight / 2 % resolutionAlignment);

    is(v2.videoWidth, expectedWidth,

       "sink is half the width of the source");

    is(v2.videoHeight, expectedHeight,

       "sink is half the height of the source");

    stream.getTracks().forEach(track => track.stop());

    v1.srcObject = v2.srcObject = null;

    pc1.close()

    pc2.close()

  runNetworkTest(async () => {

    await matchPlatformH264CodecPrefs();

    const hasH264 = await checkForH264Support();

    if (hasH264 && navigator.userAgent.includes("Android")) {

      // Android only has a hw encoder for h264

      resolutionAlignment = 16;

    await pushPrefs(['media.peerconnection.video.lock_scaling', true]);

    await testScale("VP8");

    if (hasH264) {

      await testScale("H264");

});

</script>

</pre>

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