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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>test DelayNode channel count changes</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">
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestCompleteLog();
+
+const bufferSize = 4096;
+
+var ctx;
+var testDelay;
+var stereoDelay;
+var invertor;
+
+function compareOutputs(callback) {
+ var processor = ctx.createScriptProcessor(bufferSize, 2, 0);
+ testDelay.connect(processor);
+ invertor.connect(processor);
+ processor.onaudioprocess =
+ function(e) {
+ compareBuffers(e.inputBuffer,
+ ctx.createBuffer(2, bufferSize, ctx.sampleRate));
+ e.target.onaudioprocess = null;
+ callback();
+ }
+}
+
+function startTest() {
+ // And a two-channel signal
+ var merger = ctx.createChannelMerger();
+ merger.connect(testDelay);
+ merger.connect(stereoDelay);
+ var oscL = ctx.createOscillator();
+ oscL.connect(merger, 0, 0);
+ oscL.start(0);
+ var oscR = ctx.createOscillator();
+ oscR.type = "sawtooth";
+ oscR.connect(merger, 0, 1);
+ oscR.start(0);
+
+ compareOutputs(
+ function () {
+ // Disconnect the two-channel signal and test again
+ merger.disconnect();
+ compareOutputs(SimpleTest.finish);
+ });
+}
+
+function prepareTest() {
+ ctx = new AudioContext();
+
+ // The output of a test delay node with mono and stereo input will be
+ // compared with that of separate mono and stereo delay nodes.
+ const delayTime = 0.3 * bufferSize / ctx.sampleRate;
+ testDelay = ctx.createDelay(delayTime);
+ testDelay.delayTime.value = delayTime;
+ monoDelay = ctx.createDelay(delayTime);
+ monoDelay.delayTime.value = delayTime;
+ stereoDelay = ctx.createDelay(delayTime);
+ stereoDelay.delayTime.value = delayTime;
+
+ // Create a one-channel signal and connect to the delay nodes
+ var monoOsc = ctx.createOscillator();
+ monoOsc.frequency.value = 110;
+ monoOsc.connect(testDelay);
+ monoOsc.connect(monoDelay);
+ monoOsc.start(0);
+
+ // Invert the expected so that mixing with the test will find the difference.
+ invertor = ctx.createGain();
+ invertor.gain.value = -1.0;
+ monoDelay.connect(invertor);
+ stereoDelay.connect(invertor);
+
+ // Start the test after the delay nodes have begun processing.
+ var processor = ctx.createScriptProcessor(bufferSize, 1, 0);
+ processor.connect(ctx.destination);
+
+ processor.onaudioprocess =
+ function(e) {
+ e.target.onaudioprocess = null;
+ processor.disconnect();
+ startTest();
+ };
+}
+prepareTest();
+</script>
+</pre>
+</body>
+</html>