webaudio/test-basic.html

<!DOCTYPE html>

<!--
This is a very basic test to make sure testRunner.setAudioData() works correctly.
It generates a 2 seconds long stereo result @44.1KHz
The left channel will be a 880Hz tone, while the right will be 440Hz.
-->

<html>
<head>
<script src="../fast/js/resources/js-test-pre.js"></script>
<script type="text/javascript" src="resources/audio-testing.js"></script>

</head>
<body>

<div id="description"></div>
<div id="console"></div>

<script>
description("Tests basic audio test infrastructure: specifically testRunner.setAudioData()");

var sampleRate = 44100.0;
var lengthInSeconds = 2;

function generateSinWave(audioBuffer) {
    var n = audioBuffer.length;
    var channelL = audioBuffer.getChannelData(0);
    var channelR = audioBuffer.getChannelData(1);
    var sampleRate = audioBuffer.sampleRate;
    
    for (var i = 0; i < n; ++i) {
        channelL[i] = Math.sin(880.0 * 2.0*Math.PI * i / sampleRate);
        channelR[i] = Math.sin(440.0 * 2.0*Math.PI * i / sampleRate);
    }
}

function runTest() {
    if (!window.testRunner)
        return;
    
    var context = new webkitAudioContext();
    var audioBuffer = context.createBuffer(2, lengthInSeconds * sampleRate, sampleRate);
    
    generateSinWave(audioBuffer);

    var audioData = createAudioData(audioBuffer);
    testRunner.setAudioData(audioData);

    testRunner.notifyDone();
}

runTest();

</script>

<script src="../fast/js/resources/js-test-post.js"></script>

<body>
</body>
</html>