1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_delayNodeTailWithReconnect.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,138 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test tail time lifetime of DelayNode after input finishes and new input added</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 +// The buffer source will start on a block boundary, so keeping the signal
1.19 +// within one block ensures that it will not cross AudioProcessingEvent buffer
1.20 +// boundaries.
1.21 +const signalLength = 128;
1.22 +const bufferSize = 1024;
1.23 +// Delay should be long enough to allow CC to run
1.24 +var delayBufferCount = 50;
1.25 +var delayBufferOffset;
1.26 +const delayLength = delayBufferCount * bufferSize;
1.27 +
1.28 +var phase = "initial";
1.29 +var sourceCount = 0;
1.30 +var delayCount = 0;
1.31 +var oscillator;
1.32 +var delay;
1.33 +var source;
1.34 +
1.35 +function applySignal(buffer, offset) {
1.36 + for (var i = 0; i < signalLength; ++i) {
1.37 + buffer.getChannelData(0)[offset + i] = Math.cos(Math.PI * i / signalLength);
1.38 + }
1.39 +}
1.40 +
1.41 +function bufferIsSilent(buffer, out) {
1.42 + for (var i = 0; i < buffer.length; ++i) {
1.43 + if (buffer.getChannelData(0)[i] != 0) {
1.44 + if (out) {
1.45 + out.soundOffset = i;
1.46 + }
1.47 + return false;
1.48 + }
1.49 + }
1.50 + return true;
1.51 +}
1.52 +
1.53 +function onDelayOutput(e) {
1.54 + switch(phase) {
1.55 +
1.56 + case "initial":
1.57 + // Wait for oscillator sound to exit delay
1.58 + if (bufferIsSilent(e.inputBuffer))
1.59 + break;
1.60 +
1.61 + phase = "played oscillator";
1.62 + break;
1.63 +
1.64 + case "played oscillator":
1.65 + // First tail time has expired. Start second source and remove references
1.66 + // to the delay and connected second source.
1.67 + oscillator.disconnect();
1.68 + source.connect(delay);
1.69 + source.start();
1.70 + source = null;
1.71 + delay = null;
1.72 + phase = "started second source";
1.73 + break;
1.74 +
1.75 + case "second tail time":
1.76 + if (delayCount == delayBufferCount) {
1.77 + var ctx = e.target.context;
1.78 + var expected = ctx.createBuffer(1, bufferSize, ctx.sampleRate);
1.79 + applySignal(expected, delayBufferOffset);
1.80 + compareBuffers(e.inputBuffer, expected);
1.81 + e.target.onaudioprocess = null;
1.82 + SimpleTest.finish();
1.83 + }
1.84 + }
1.85 +
1.86 + delayCount++;
1.87 +}
1.88 +
1.89 +function onSourceOutput(e) {
1.90 + switch(phase) {
1.91 + case "started second source":
1.92 + var out = {};
1.93 + if (!bufferIsSilent(e.inputBuffer, out)) {
1.94 + delayBufferCount += sourceCount;
1.95 + delayBufferOffset = out.soundOffset;
1.96 + phase = "played second source";
1.97 + }
1.98 + break;
1.99 + case "played second source":
1.100 + SpecialPowers.forceGC();
1.101 + SpecialPowers.forceCC();
1.102 + phase = "second tail time";
1.103 + e.target.onaudioprocess = null;
1.104 + }
1.105 +
1.106 + sourceCount++;
1.107 +}
1.108 +
1.109 +function startTest() {
1.110 + var ctx = new AudioContext();
1.111 + var delayDuration = delayLength / ctx.sampleRate;
1.112 + delay = ctx.createDelay(delayDuration);
1.113 + delay.delayTime.value = delayDuration;
1.114 + var processor1 = ctx.createScriptProcessor(bufferSize, 1, 0);
1.115 + delay.connect(processor1);
1.116 + processor1.onaudioprocess = onDelayOutput;
1.117 + processor1.connect(ctx.destination); // work around bug 916387
1.118 +
1.119 + // Signal to trigger initial tail time reference
1.120 + oscillator = ctx.createOscillator();
1.121 + oscillator.start(0);
1.122 + oscillator.stop(100/ctx.sampleRate);
1.123 + oscillator.connect(delay);
1.124 +
1.125 + // Short signal, not started yet, with a ScriptProcessor to detect when it
1.126 + // starts. It should finish before garbage collection.
1.127 + var buffer = ctx.createBuffer(1, signalLength, ctx.sampleRate);
1.128 + applySignal(buffer, 0);
1.129 + source = ctx.createBufferSource();
1.130 + source.buffer = buffer;
1.131 + var processor2 = ctx.createScriptProcessor(bufferSize, 1, 0);
1.132 + source.connect(processor2);
1.133 + processor2.onaudioprocess = onSourceOutput;
1.134 + processor2.connect(ctx.destination); // guard against bug 916387
1.135 +};
1.136 +
1.137 +startTest();
1.138 +</script>
1.139 +</pre>
1.140 +</body>
1.141 +</html>
