176 lines
6.0 KiB
HTML
176 lines
6.0 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>
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Test Sampling of LinearRampToValueAtTime
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</title>
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<script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script>
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<script src="../../resources/testharnessreport.js"></script>
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<script src="../resources/audit-util.js"></script>
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<script src="../resources/audit.js"></script>
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<script src="../resources/audioparam-testing.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 sampleRate = 12800;
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let context;
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let audit = Audit.createTaskRunner();
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function runTest(should, config) {
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// Create a short context with a constant signal source connected to a
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// gain node that will be automated.
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context = new OfflineAudioContext(1, 256, sampleRate);
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// Create a constant unit amplitude source.
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let source = context.createBufferSource();
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let b = createConstantBuffer(context, 1, 1);
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source.buffer = b;
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source.loop = true;
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// Gain node that is to be automated.
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let gain = context.createGain();
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gain.gain.value = 0;
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gain.gain.setValueAtTime(config.startValue, config.startTime);
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config.automationFunction(gain);
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source.connect(gain);
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gain.connect(context.destination);
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source.start();
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return context.startRendering().then(function(resultBuffer) {
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// Check that the automation has the correct sampling.
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let resultData = resultBuffer.getChannelData(0);
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// The automation has starts at config.startTime, so the frame just
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// after this should have the automation applied.
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let startFrame = Math.ceil(config.startTime * sampleRate);
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// The automation ends at config.endTime so the frame just before this
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// should have the automation applied.
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let endFrame = Math.floor(config.endTime * sampleRate);
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// Use the true automation to find the expected values.
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let expectedStart = config.expectedFunction(startFrame / sampleRate);
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let expectedEnd = config.expectedFunction(endFrame / sampleRate);
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should(resultData[startFrame], config.desc + ': Sample ' + startFrame)
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.beCloseTo(
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expectedStart, {threshold: config.startValueThreshold});
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should(resultData[endFrame], config.desc + ': Sample ' + endFrame)
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.beCloseTo(expectedEnd, {threshold: config.endValueThreshold});
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});
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}
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function expectedLinear(t) {
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let slope =
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(this.endValue - this.startValue) / (this.endTime - this.startTime);
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return this.startValue + slope * (t - this.startTime);
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};
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function expectedExponential(t) {
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let ratio = this.endValue / this.startValue;
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let exponent = (t - this.startTime) / (this.endTime - this.startTime);
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return this.startValue * Math.pow(ratio, exponent);
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};
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function linearAutomation(g) {
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g.gain.linearRampToValueAtTime(this.endValue, this.endTime);
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}
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function exponentialAutomation(g) {
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g.gain.exponentialRampToValueAtTime(this.endValue, this.endTime);
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}
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// Basically want to test that if neither the start time nor end time is
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// on a frame boundary that we sample the automation curve correctly. The
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// start times and end times are mostly arbitrary, except that they cannot
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// be on a frame boundary.
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let testConfigs = [
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{
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desc: 'linearRamp',
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startTime: .1 / sampleRate,
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endTime: 128.1 / sampleRate,
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startValue: 1,
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endValue: 0,
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startValueThreshold: 1.201e-8,
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endValueThreshold: 1.526e-5,
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automationFunction: linearAutomation,
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expectedFunction: expectedLinear
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},
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{
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desc: 'linearRamp:short',
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startTime: .1 / sampleRate,
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endTime: 5.1 / sampleRate,
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startValue: 1,
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endValue: 0,
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startValueThreshold: 8.723e-9,
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endValueThreshold: 9.537e-7,
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automationFunction: linearAutomation,
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expectedFunction: expectedLinear
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},
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{
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desc: 'linearRamp:long',
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startTime: .1 / sampleRate,
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endTime: 200.1 / sampleRate,
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startValue: 1,
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endValue: 0,
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startValueThreshold: 2.827e-8,
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endValueThreshold: 4.674e-5,
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automationFunction: linearAutomation,
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expectedFunction: expectedLinear
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},
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{
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desc: 'exponentialRamp',
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startTime: .1 / sampleRate,
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endTime: 128.1 / sampleRate,
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startValue: 1,
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endValue: 1e-5,
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startValueThreshold: 2.505e-8,
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endValueThreshold: 1.484e-7,
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automationFunction: exponentialAutomation,
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expectedFunction: expectedExponential
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},
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{
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desc: 'exponentialRamp:short',
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startTime: .1 / sampleRate,
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endTime: 5.1 / sampleRate,
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startValue: 1,
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endValue: 1e-5,
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startValueThreshold: 5.027e-8,
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endValueThreshold: 3.821e-7,
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automationFunction: exponentialAutomation,
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expectedFunction: expectedExponential
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},
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{
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desc: 'exponentialRamp:long',
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startTime: .1 / sampleRate,
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endTime: 200.1 / sampleRate,
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startValue: 1,
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endValue: 1e-5,
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startValueThreshold: 8.035e-9,
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endValueThreshold: 1.337e-6,
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automationFunction: exponentialAutomation,
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expectedFunction: expectedExponential
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},
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];
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function createTaskFunction(config) {
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return (task, should) => {
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runTest(should, config).then(() => task.done());
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};
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}
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// Create all of the tasks from the test configs
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for (let k = 0; k < testConfigs.length; ++k) {
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let config = testConfigs[k];
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let taskName = config.desc + ':task' + k;
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audit.define(taskName, createTaskFunction(config));
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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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