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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test tail time lifetime of DelayNode after input is disconnected</title>
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="text/javascript" src="webaudio.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+// Web Audio doesn't provide a means to precisely time disconnect()s but we
+// can test that the output of delay nodes matches the output from their
+// sources before they are disconnected.
+
+SimpleTest.waitForExplicitFinish();
+
+const signalLength = 128;
+const bufferSize = 4096;
+const sourceCount = bufferSize / signalLength;
+// Delay should be long enough to allow CC to run
+var delayBufferCount = 20;
+const delayLength = delayBufferCount * bufferSize;
+
+var sourceOutput = new Float32Array(bufferSize);
+var delayOutputCount = 0;
+var sources = [];
+
+function onDelayOutput(e) {
+ if (delayOutputCount < delayBufferCount) {
+ delayOutputCount++;
+ return;
+ }
+
+ compareChannels(e.inputBuffer.getChannelData(0), sourceOutput);
+ e.target.onaudioprocess = null;
+ SimpleTest.finish();
+}
+
+function onSourceOutput(e) {
+ // Record the first buffer
+ e.inputBuffer.copyFromChannel(sourceOutput, 0);
+ e.target.onaudioprocess = null;
+}
+
+function disconnectSources() {
+ for (var i = 0; i < sourceCount; ++i) {
+ sources[i].disconnect();
+ }
+
+ SpecialPowers.forceGC();
+ SpecialPowers.forceCC();
+}
+
+function startTest() {
+ var ctx = new AudioContext();
+
+ var sourceProcessor = ctx.createScriptProcessor(bufferSize, 1, 0);
+ sourceProcessor.onaudioprocess = onSourceOutput;
+ // Keep audioprocess events going after source disconnect.
+ sourceProcessor.connect(ctx.destination);
+
+ var delayProcessor = ctx.createScriptProcessor(bufferSize, 1, 0);
+ delayProcessor.onaudioprocess = onDelayOutput;
+
+ var delayDuration = delayLength / ctx.sampleRate;
+ for (var i = 0; i < sourceCount; ++i) {
+ var delay = ctx.createDelay(delayDuration);
+ delay.delayTime.value = delayDuration;
+ delay.connect(delayProcessor);
+
+ var source = ctx.createOscillator();
+ source.frequency.value = 440 + 10 * i
+ source.start(i * signalLength / ctx.sampleRate);
+ source.stop((i + 1) * signalLength / ctx.sampleRate);
+ source.connect(delay);
+ source.connect(sourceProcessor);
+
+ sources[i] = source;
+ }
+
+ // Assuming the above Web Audio operations have already scheduled an event
+ // to run in stable state and start the graph thread, schedule a subsequent
+ // event to disconnect the sources, which will remove main thread connection
+ // references before it knows the graph thread has started using the source
+ // streams.
+ SimpleTest.executeSoon(disconnectSources);
+};
+
+startTest();
+</script>
+</pre>
+</body>
+</html>