4 This is a very basic test to make sure testRunner.setAudioData() works correctly.
5 It generates a 2 seconds long stereo result @44.1KHz
6 The left channel will be a 880Hz tone, while the right will be 440Hz.
11 <script src="../fast/js/resources/js-test-pre.js"></script>
12 <script type="text/javascript" src="resources/audio-testing.js"></script>
17 <div id="description"></div>
18 <div id="console"></div>
21 description("Tests basic audio test infrastructure: specifically testRunner.setAudioData()");
23 var sampleRate = 44100.0;
24 var lengthInSeconds = 2;
26 function generateSinWave(audioBuffer) {
27 var n = audioBuffer.length;
28 var channelL = audioBuffer.getChannelData(0);
29 var channelR = audioBuffer.getChannelData(1);
30 var sampleRate = audioBuffer.sampleRate;
32 for (var i = 0; i < n; ++i) {
33 channelL[i] = Math.sin(880.0 * 2.0*Math.PI * i / sampleRate);
34 channelR[i] = Math.sin(440.0 * 2.0*Math.PI * i / sampleRate);
39 if (!window.testRunner)
42 var context = new webkitAudioContext();
43 var audioBuffer = context.createBuffer(2, lengthInSeconds * sampleRate, sampleRate);
45 generateSinWave(audioBuffer);
47 var audioData = createAudioData(audioBuffer);
48 testRunner.setAudioData(audioData);
50 testRunner.notifyDone();
57 <script src="../fast/js/resources/js-test-post.js"></script>