audionode-connect-order.html

Enable keyboard shortcuts

This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-audionode-interface/audionode-connect-order.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

  <head>

    <title>

      audionode-connect-order.html

    </title>

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

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

    <script src="/webaudio/resources/audit-util.js"></script>

    <script src="/webaudio/resources/audit.js"></script>

  </head>

  <body>

    <script id="layout-test-code">

      let audit = Audit.createTaskRunner();

      let sampleRate = 44100.0;

      let renderLengthSeconds = 0.125;

      let delayTimeSeconds = 0.1;

      function createSinWaveBuffer(context, lengthInSeconds, frequency) {

        let audioBuffer =

            context.createBuffer(1, lengthInSeconds * sampleRate, sampleRate);

        let n = audioBuffer.length;

        let data = audioBuffer.getChannelData(0);

        for (let i = 0; i < n; ++i) {

          data[i] = Math.sin(frequency * 2 * Math.PI * i / sampleRate);

        return audioBuffer;

      audit.define(

            label: 'Test connections',

            description:

                'AudioNode connection order doesn\'t trigger assertion errors'

},

          function(task, should) {

            // Create offline audio context.

            let context = new OfflineAudioContext(

                1, sampleRate * renderLengthSeconds, sampleRate);

            let toneBuffer =

                createSinWaveBuffer(context, renderLengthSeconds, 880);

            let bufferSource = context.createBufferSource();

            bufferSource.buffer = toneBuffer;

            bufferSource.connect(context.destination);

            let delay = context.createDelay();

            delay.delayTime.value = delayTimeSeconds;

            // We connect delay node to gain node before anything is connected

            // to delay node itself.  We do this because we try to trigger the

            // ASSERT which might be fired due to AudioNode connection order,

            // especially when gain node and delay node is involved e.g.

            // https://bugs.webkit.org/show_bug.cgi?id=76685.

            should(() => {

              let gain = context.createGain();

              gain.connect(context.destination);

              delay.connect(gain);

            }, 'Connecting nodes').notThrow();

            bufferSource.start(0);

            let promise = context.startRendering();

            should(promise, 'OfflineContext startRendering()')

                .beResolved()

                .then(task.done.bind(task));

});

      audit.run();

    </script>

  </body>

</html>