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