1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_delayNodeChannelChanges.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,97 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>test DelayNode channel count changes</title>
1.8 + <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
1.9 + <script type="text/javascript" src="webaudio.js"></script>
1.10 + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
1.11 +</head>
1.12 +<body>
1.13 +<pre id="test">
1.14 +<script class="testbody" type="text/javascript">
1.15 +
1.16 +SimpleTest.waitForExplicitFinish();
1.17 +
1.18 +const bufferSize = 4096;
1.19 +
1.20 +var ctx;
1.21 +var testDelay;
1.22 +var stereoDelay;
1.23 +var invertor;
1.24 +
1.25 +function compareOutputs(callback) {
1.26 + var processor = ctx.createScriptProcessor(bufferSize, 2, 0);
1.27 + testDelay.connect(processor);
1.28 + invertor.connect(processor);
1.29 + processor.onaudioprocess =
1.30 + function(e) {
1.31 + compareBuffers(e.inputBuffer,
1.32 + ctx.createBuffer(2, bufferSize, ctx.sampleRate));
1.33 + e.target.onaudioprocess = null;
1.34 + callback();
1.35 + }
1.36 +}
1.37 +
1.38 +function startTest() {
1.39 + // And a two-channel signal
1.40 + var merger = ctx.createChannelMerger();
1.41 + merger.connect(testDelay);
1.42 + merger.connect(stereoDelay);
1.43 + var oscL = ctx.createOscillator();
1.44 + oscL.connect(merger, 0, 0);
1.45 + oscL.start(0);
1.46 + var oscR = ctx.createOscillator();
1.47 + oscR.type = "sawtooth";
1.48 + oscR.connect(merger, 0, 1);
1.49 + oscR.start(0);
1.50 +
1.51 + compareOutputs(
1.52 + function () {
1.53 + // Disconnect the two-channel signal and test again
1.54 + merger.disconnect();
1.55 + compareOutputs(SimpleTest.finish);
1.56 + });
1.57 +}
1.58 +
1.59 +function prepareTest() {
1.60 + ctx = new AudioContext();
1.61 +
1.62 + // The output of a test delay node with mono and stereo input will be
1.63 + // compared with that of separate mono and stereo delay nodes.
1.64 + const delayTime = 0.3 * bufferSize / ctx.sampleRate;
1.65 + testDelay = ctx.createDelay(delayTime);
1.66 + testDelay.delayTime.value = delayTime;
1.67 + monoDelay = ctx.createDelay(delayTime);
1.68 + monoDelay.delayTime.value = delayTime;
1.69 + stereoDelay = ctx.createDelay(delayTime);
1.70 + stereoDelay.delayTime.value = delayTime;
1.71 +
1.72 + // Create a one-channel signal and connect to the delay nodes
1.73 + var monoOsc = ctx.createOscillator();
1.74 + monoOsc.frequency.value = 110;
1.75 + monoOsc.connect(testDelay);
1.76 + monoOsc.connect(monoDelay);
1.77 + monoOsc.start(0);
1.78 +
1.79 + // Invert the expected so that mixing with the test will find the difference.
1.80 + invertor = ctx.createGain();
1.81 + invertor.gain.value = -1.0;
1.82 + monoDelay.connect(invertor);
1.83 + stereoDelay.connect(invertor);
1.84 +
1.85 + // Start the test after the delay nodes have begun processing.
1.86 + var processor = ctx.createScriptProcessor(bufferSize, 1, 0);
1.87 + processor.connect(ctx.destination);
1.88 +
1.89 + processor.onaudioprocess =
1.90 + function(e) {
1.91 + e.target.onaudioprocess = null;
1.92 + processor.disconnect();
1.93 + startTest();
1.94 + };
1.95 +}
1.96 +prepareTest();
1.97 +</script>
1.98 +</pre>
1.99 +</body>
1.100 +</html>
