1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_delayNodeTailWithGain.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,72 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test tail time lifetime of DelayNode indirectly connected to source</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 signalLength = 130;
1.19 +const bufferSize = 1024;
1.20 +// Delay should be long enough to allow CC to run
1.21 +const delayBufferCount = 50;
1.22 +const delayLength = delayBufferCount * bufferSize + 700;
1.23 +
1.24 +var count = 0;
1.25 +
1.26 +function applySignal(buffer, offset) {
1.27 + for (var i = 0; i < signalLength; ++i) {
1.28 + buffer.getChannelData(0)[offset + i] = Math.cos(Math.PI * i / signalLength);
1.29 + }
1.30 +}
1.31 +
1.32 +function onAudioProcess(e) {
1.33 + switch(count) {
1.34 + case 5:
1.35 + SpecialPowers.forceGC();
1.36 + SpecialPowers.forceCC();
1.37 + break;
1.38 + case delayBufferCount:
1.39 + var offset = delayLength - count * bufferSize;
1.40 + var ctx = e.target.context;
1.41 + var expected = ctx.createBuffer(1, bufferSize, ctx.sampleRate);
1.42 + applySignal(expected, offset);
1.43 + compareBuffers(e.inputBuffer, expected);
1.44 + SimpleTest.finish();
1.45 + }
1.46 + count++;
1.47 +}
1.48 +
1.49 +function startTest() {
1.50 + var ctx = new AudioContext();
1.51 + var processor = ctx.createScriptProcessor(bufferSize, 1, 0);
1.52 + processor.onaudioprocess = onAudioProcess;
1.53 +
1.54 + var delayDuration = delayLength / ctx.sampleRate;
1.55 + var delay = ctx.createDelay(delayDuration);
1.56 + delay.delayTime.value = delayDuration;
1.57 + delay.connect(processor);
1.58 +
1.59 + var gain = ctx.createGain();
1.60 + gain.connect(delay);
1.61 +
1.62 + // Short signal that finishes before garbage collection
1.63 + var buffer = ctx.createBuffer(1, signalLength, ctx.sampleRate);
1.64 + applySignal(buffer, 0);
1.65 + var source = ctx.createBufferSource();
1.66 + source.buffer = buffer;
1.67 + source.start();
1.68 + source.connect(gain);
1.69 +};
1.70 +
1.71 +startTest();
1.72 +</script>
1.73 +</pre>
1.74 +</body>
1.75 +</html>
