1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_delayNodeTailWithDisconnect.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 tail time lifetime of DelayNode after input is disconnected</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 +// Web Audio doesn't provide a means to precisely time disconnect()s but we
1.17 +// can test that the output of delay nodes matches the output from their
1.18 +// sources before they are disconnected.
1.19 +
1.20 +SimpleTest.waitForExplicitFinish();
1.21 +
1.22 +const signalLength = 128;
1.23 +const bufferSize = 4096;
1.24 +const sourceCount = bufferSize / signalLength;
1.25 +// Delay should be long enough to allow CC to run
1.26 +var delayBufferCount = 20;
1.27 +const delayLength = delayBufferCount * bufferSize;
1.28 +
1.29 +var sourceOutput = new Float32Array(bufferSize);
1.30 +var delayOutputCount = 0;
1.31 +var sources = [];
1.32 +
1.33 +function onDelayOutput(e) {
1.34 + if (delayOutputCount < delayBufferCount) {
1.35 + delayOutputCount++;
1.36 + return;
1.37 + }
1.38 +
1.39 + compareChannels(e.inputBuffer.getChannelData(0), sourceOutput);
1.40 + e.target.onaudioprocess = null;
1.41 + SimpleTest.finish();
1.42 +}
1.43 +
1.44 +function onSourceOutput(e) {
1.45 + // Record the first buffer
1.46 + e.inputBuffer.copyFromChannel(sourceOutput, 0);
1.47 + e.target.onaudioprocess = null;
1.48 +}
1.49 +
1.50 +function disconnectSources() {
1.51 + for (var i = 0; i < sourceCount; ++i) {
1.52 + sources[i].disconnect();
1.53 + }
1.54 +
1.55 + SpecialPowers.forceGC();
1.56 + SpecialPowers.forceCC();
1.57 +}
1.58 +
1.59 +function startTest() {
1.60 + var ctx = new AudioContext();
1.61 +
1.62 + var sourceProcessor = ctx.createScriptProcessor(bufferSize, 1, 0);
1.63 + sourceProcessor.onaudioprocess = onSourceOutput;
1.64 + // Keep audioprocess events going after source disconnect.
1.65 + sourceProcessor.connect(ctx.destination);
1.66 +
1.67 + var delayProcessor = ctx.createScriptProcessor(bufferSize, 1, 0);
1.68 + delayProcessor.onaudioprocess = onDelayOutput;
1.69 + // Work around bug 916387.
1.70 + delayProcessor.connect(ctx.destination);
1.71 +
1.72 + var delayDuration = delayLength / ctx.sampleRate;
1.73 + for (var i = 0; i < sourceCount; ++i) {
1.74 + var delay = ctx.createDelay(delayDuration);
1.75 + delay.delayTime.value = delayDuration;
1.76 + delay.connect(delayProcessor);
1.77 +
1.78 + var source = ctx.createOscillator();
1.79 + source.frequency.value = 440 + 10 * i
1.80 + source.start(i * signalLength / ctx.sampleRate);
1.81 + source.stop((i + 1) * signalLength / ctx.sampleRate);
1.82 + source.connect(delay);
1.83 + source.connect(sourceProcessor);
1.84 +
1.85 + sources[i] = source;
1.86 + }
1.87 +
1.88 + // Assuming the above Web Audio operations have already scheduled an event
1.89 + // to run in stable state and start the graph thread, schedule a subsequent
1.90 + // event to disconnect the sources, which will remove main thread connection
1.91 + // references before it knows the graph thread has started using the source
1.92 + // streams.
1.93 + SimpleTest.executeSoon(disconnectSources);
1.94 +};
1.95 +
1.96 +startTest();
1.97 +</script>
1.98 +</pre>
1.99 +</body>
1.100 +</html>
