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98 lines
2.8 KiB
HTML
98 lines
2.8 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test tail time lifetime of DelayNode after input is disconnected</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<script type="text/javascript" src="webaudio.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<pre id="test">
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<script class="testbody" type="text/javascript">
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// Web Audio doesn't provide a means to precisely time disconnect()s but we
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// can test that the output of delay nodes matches the output from their
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// sources before they are disconnected.
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SimpleTest.waitForExplicitFinish();
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const signalLength = 128;
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const bufferSize = 4096;
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const sourceCount = bufferSize / signalLength;
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// Delay should be long enough to allow CC to run
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var delayBufferCount = 20;
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const delayLength = delayBufferCount * bufferSize;
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var sourceOutput = new Float32Array(bufferSize);
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var delayOutputCount = 0;
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var sources = [];
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function onDelayOutput(e) {
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if (delayOutputCount < delayBufferCount) {
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delayOutputCount++;
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return;
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}
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compareChannels(e.inputBuffer.getChannelData(0), sourceOutput);
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e.target.onaudioprocess = null;
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SimpleTest.finish();
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}
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function onSourceOutput(e) {
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// Record the first buffer
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e.inputBuffer.copyFromChannel(sourceOutput, 0);
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e.target.onaudioprocess = null;
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}
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function disconnectSources() {
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for (var i = 0; i < sourceCount; ++i) {
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sources[i].disconnect();
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}
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SpecialPowers.forceGC();
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SpecialPowers.forceCC();
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}
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function startTest() {
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var ctx = new AudioContext();
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var sourceProcessor = ctx.createScriptProcessor(bufferSize, 1, 0);
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sourceProcessor.onaudioprocess = onSourceOutput;
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// Keep audioprocess events going after source disconnect.
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sourceProcessor.connect(ctx.destination);
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var delayProcessor = ctx.createScriptProcessor(bufferSize, 1, 0);
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delayProcessor.onaudioprocess = onDelayOutput;
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// Work around bug 916387.
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delayProcessor.connect(ctx.destination);
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var delayDuration = delayLength / ctx.sampleRate;
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for (var i = 0; i < sourceCount; ++i) {
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var delay = ctx.createDelay(delayDuration);
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delay.delayTime.value = delayDuration;
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delay.connect(delayProcessor);
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var source = ctx.createOscillator();
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source.frequency.value = 440 + 10 * i
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source.start(i * signalLength / ctx.sampleRate);
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source.stop((i + 1) * signalLength / ctx.sampleRate);
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source.connect(delay);
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source.connect(sourceProcessor);
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sources[i] = source;
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}
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// Assuming the above Web Audio operations have already scheduled an event
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// to run in stable state and start the graph thread, schedule a subsequent
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// event to disconnect the sources, which will remove main thread connection
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// references before it knows the graph thread has started using the source
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// streams.
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SimpleTest.executeSoon(disconnectSources);
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};
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startTest();
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</script>
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</pre>
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</body>
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</html>
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