peerconnection_audio_forced_sample_rate.js

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// This function takes a sample-rate, and tests that audio flows correctly when

// the sampling-rate at which the MTG runs is not one of the sampling-rates that

// the MediaPipeline can work with.

// It is in a separate file because we have an MTG per document, and we want to

// test multiple sample-rates, so we include it in multiple HTML mochitest

// files.

async function test_peerconnection_audio_forced_sample_rate(forcedSampleRate) {

  await scriptsReady;

  await pushPrefs(["media.cubeb.force_sample_rate", forcedSampleRate]);

  await runNetworkTest(function (options) {

    const test = new PeerConnectionTest(options);

    const ac = new AudioContext();

    test.setMediaConstraints([{ audio: true }], []);

    test.chain.replace("PC_LOCAL_GUM", [

      function PC_LOCAL_WEBAUDIO_SOURCE(test) {

        const oscillator = ac.createOscillator();

        oscillator.type = "sine";

        oscillator.frequency.value = 700;

        oscillator.start();

        const dest = ac.createMediaStreamDestination();

        oscillator.connect(dest);

        test.pcLocal.attachLocalStream(dest.stream);

},

]);

    test.chain.append([

      function CHECK_REMOTE_AUDIO_FLOW(test) {

        return test.pcRemote.checkReceivingToneFrom(ac, test.pcLocal);

},

]);

    return test.run();

});