103 lines
3.3 KiB
HTML
103 lines
3.3 KiB
HTML
<!doctype html>
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<html>
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<head>
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<title>
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Test Silent Inputs to WaveShaperNode
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</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/webaudio/resources/audit-util.js"></script>
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<script src="/webaudio/resources/audit.js"></script>
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</head>
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<body>
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<script id="layout-test-code">
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let audit = Audit.createTaskRunner();
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let sampleRate = 16000;
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// Identity curve for the wave shaper: the input value is mapped directly
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// to the output value.
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let identityCurve = [-1, 0, 1];
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let nonZeroCurve = [0.5, 0.5, 0.5];
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audit.define(
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{
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label: 'test-0',
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description: 'curve output is non-zero for silent inputs'
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},
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(task, should) => {
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let {context, source, shaper} =
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setupGraph(nonZeroCurve, sampleRate, sampleRate);
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source.offset.setValueAtTime(0, 0);
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context.startRendering()
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.then(audioBuffer => {
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should(
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audioBuffer.getChannelData(0),
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'WaveShaper with silent inputs and curve ' +
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JSON.stringify(shaper.curve))
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.beConstantValueOf(0.5);
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})
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.then(() => task.done());
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});
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audit.define(
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{
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label: 'test-1',
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description: '2x curve output is non-zero for silent inputs'
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},
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(task, should) => {
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let {context, source, shaper} =
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setupGraph(nonZeroCurve, sampleRate, sampleRate);
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source.offset.setValueAtTime(0, 0);
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shaper.overSample = '2x';
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context.startRendering()
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.then(audioBuffer => {
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should(
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audioBuffer.getChannelData(0),
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'WaveShaper with ' + shaper.overSample +
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' oversample, silent inputs, and curve ' +
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JSON.stringify(shaper.curve))
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.beConstantValueOf(0.5);
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})
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.then(() => task.done());
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});
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audit.define(
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{
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label: 'test-2',
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description: 'curve output is non-zero for no inputs'
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},
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(task, should) => {
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let {context, source, shaper} =
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setupGraph(nonZeroCurve, sampleRate, sampleRate);
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source.disconnect();
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context.startRendering()
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.then(audioBuffer => {
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should(
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audioBuffer.getChannelData(0),
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'WaveShaper with no inputs and curve ' +
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JSON.stringify(shaper.curve))
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.beConstantValueOf(0.5);
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})
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.then(() => task.done());
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});
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function setupGraph(curve, testFrames, sampleRate) {
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let context = new OfflineAudioContext(1, testFrames, sampleRate);
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let source = new ConstantSourceNode(context);
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let shaper = new WaveShaperNode(context, {curve: curve});
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source.connect(shaper).connect(context.destination);
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return {context: context, source: source, shaper: shaper};
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}
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audit.run();
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</script>
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</body>
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</html>
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