LayoutTests/webaudio/AudioParam/audioparam-sampling.html - WebKit - Git at Google

 <!DOCTYPE html>
 <html>
   <head>
     <title>
       Test Sampling of LinearRampToValueAtTime
     </title>
     <script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script>
     <script src="../../resources/testharnessreport.js"></script>
     <script src="../resources/audit-util.js"></script>
     <script src="../resources/audit.js"></script>
     <script src="../resources/audioparam-testing.js"></script>
   </head>
   <body>
     <script id="layout-test-code">
       let sampleRate = 12800;
       let context;

       let audit = Audit.createTaskRunner();

       function runTest(should, config) {
         // Create a short context with a constant signal source connected to a
         // gain node that will be automated.
         context = new OfflineAudioContext(1, 256, sampleRate);

         // Create a constant unit amplitude source.
         let source = context.createBufferSource();
         let b = createConstantBuffer(context, 1, 1);
         source.buffer = b;
         source.loop = true;

         // Gain node that is to be automated.
         let gain = context.createGain();
         gain.gain.value = 0;
         gain.gain.setValueAtTime(config.startValue, config.startTime);
         config.automationFunction(gain);

         source.connect(gain);
         gain.connect(context.destination);

         source.start();

         return context.startRendering().then(function(resultBuffer) {
           // Check that the automation has the correct sampling.
           let resultData = resultBuffer.getChannelData(0);

           // The automation has starts at config.startTime, so the frame just
           // after this should have the automation applied.
           let startFrame = Math.ceil(config.startTime * sampleRate);

           // The automation ends at config.endTime so the frame just before this
           // should have the automation applied.
           let endFrame = Math.floor(config.endTime * sampleRate);

           // Use the true automation to find the expected values.
           let expectedStart = config.expectedFunction(startFrame / sampleRate);
           let expectedEnd = config.expectedFunction(endFrame / sampleRate);

           should(resultData[startFrame], config.desc + ': Sample ' + startFrame)
               .beCloseTo(
                   expectedStart, {threshold: config.startValueThreshold});
           should(resultData[endFrame], config.desc + ': Sample ' + endFrame)
               .beCloseTo(expectedEnd, {threshold: config.endValueThreshold});
         });
       }

       function expectedLinear(t) {
         let slope =
             (this.endValue - this.startValue) / (this.endTime - this.startTime);
         return this.startValue + slope * (t - this.startTime);
       };

       function expectedExponential(t) {
         let ratio = this.endValue / this.startValue;
         let exponent = (t - this.startTime) / (this.endTime - this.startTime);
         return this.startValue * Math.pow(ratio, exponent);
       };

       function linearAutomation(g) {
         g.gain.linearRampToValueAtTime(this.endValue, this.endTime);
       }

       function exponentialAutomation(g) {
         g.gain.exponentialRampToValueAtTime(this.endValue, this.endTime);
       }

       // Basically want to test that if neither the start time nor end time is
       // on a frame boundary that we sample the automation curve correctly.  The
       // start times and end times are mostly arbitrary, except that they cannot
       // be on a frame boundary.
       let testConfigs = [
         {
           desc: 'linearRamp',
           startTime: .1 / sampleRate,
           endTime: 128.1 / sampleRate,
           startValue: 1,
           endValue: 0,
           startValueThreshold: 1.201e-8,
           endValueThreshold: 1.526e-5,
           automationFunction: linearAutomation,
           expectedFunction: expectedLinear
         },
         {
           desc: 'linearRamp:short',
           startTime: .1 / sampleRate,
           endTime: 5.1 / sampleRate,
           startValue: 1,
           endValue: 0,
           startValueThreshold: 8.723e-9,
           endValueThreshold: 9.537e-7,
           automationFunction: linearAutomation,
           expectedFunction: expectedLinear
         },
         {
           desc: 'linearRamp:long',
           startTime: .1 / sampleRate,
           endTime: 200.1 / sampleRate,
           startValue: 1,
           endValue: 0,
           startValueThreshold: 2.827e-8,
           endValueThreshold: 4.674e-5,
           automationFunction: linearAutomation,
           expectedFunction: expectedLinear
         },
         {
           desc: 'exponentialRamp',
           startTime: .1 / sampleRate,
           endTime: 128.1 / sampleRate,
           startValue: 1,
           endValue: 1e-5,
           startValueThreshold: 2.505e-8,
           endValueThreshold: 1.484e-7,
           automationFunction: exponentialAutomation,
           expectedFunction: expectedExponential
         },
         {
           desc: 'exponentialRamp:short',
           startTime: .1 / sampleRate,
           endTime: 5.1 / sampleRate,
           startValue: 1,
           endValue: 1e-5,
           startValueThreshold: 5.027e-8,
           endValueThreshold: 3.821e-7,
           automationFunction: exponentialAutomation,
           expectedFunction: expectedExponential
         },
         {
           desc: 'exponentialRamp:long',
           startTime: .1 / sampleRate,
           endTime: 200.1 / sampleRate,
           startValue: 1,
           endValue: 1e-5,
           startValueThreshold: 8.035e-9,
           endValueThreshold: 1.337e-6,
           automationFunction: exponentialAutomation,
           expectedFunction: expectedExponential
         },
       ];

       function createTaskFunction(config) {
         return (task, should) => {
           runTest(should, config).then(() => task.done());
         };
       }

       // Create all of the tasks from the test configs
       for (let k = 0; k < testConfigs.length; ++k) {
         let config = testConfigs[k];
         let taskName = config.desc + ':task' + k;
         audit.define(taskName, createTaskFunction(config));
       }

       audit.run();
     </script>
   </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<title>
	Test Sampling of LinearRampToValueAtTime
	</title>
	<script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script>
	<script src="../../resources/testharnessreport.js"></script>
	<script src="../resources/audit-util.js"></script>
	<script src="../resources/audit.js"></script>
	<script src="../resources/audioparam-testing.js"></script>
	</head>
	<body>
	<script id="layout-test-code">
	let sampleRate = 12800;
	let context;

	let audit = Audit.createTaskRunner();

	function runTest(should, config) {
	// Create a short context with a constant signal source connected to a
	// gain node that will be automated.
	context = new OfflineAudioContext(1, 256, sampleRate);

	// Create a constant unit amplitude source.
	let source = context.createBufferSource();
	let b = createConstantBuffer(context, 1, 1);
	source.buffer = b;
	source.loop = true;

	// Gain node that is to be automated.
	let gain = context.createGain();
	gain.gain.value = 0;
	gain.gain.setValueAtTime(config.startValue, config.startTime);
	config.automationFunction(gain);

	source.connect(gain);
	gain.connect(context.destination);

	source.start();

	return context.startRendering().then(function(resultBuffer) {
	// Check that the automation has the correct sampling.
	let resultData = resultBuffer.getChannelData(0);

	// The automation has starts at config.startTime, so the frame just
	// after this should have the automation applied.
	let startFrame = Math.ceil(config.startTime * sampleRate);

	// The automation ends at config.endTime so the frame just before this
	// should have the automation applied.
	let endFrame = Math.floor(config.endTime * sampleRate);

	// Use the true automation to find the expected values.
	let expectedStart = config.expectedFunction(startFrame / sampleRate);
	let expectedEnd = config.expectedFunction(endFrame / sampleRate);

	should(resultData[startFrame], config.desc + ': Sample ' + startFrame)
	.beCloseTo(
	expectedStart, {threshold: config.startValueThreshold});
	should(resultData[endFrame], config.desc + ': Sample ' + endFrame)
	.beCloseTo(expectedEnd, {threshold: config.endValueThreshold});
	});
	}

	function expectedLinear(t) {
	let slope =
	(this.endValue - this.startValue) / (this.endTime - this.startTime);
	return this.startValue + slope * (t - this.startTime);
	};

	function expectedExponential(t) {
	let ratio = this.endValue / this.startValue;
	let exponent = (t - this.startTime) / (this.endTime - this.startTime);
	return this.startValue * Math.pow(ratio, exponent);
	};

	function linearAutomation(g) {
	g.gain.linearRampToValueAtTime(this.endValue, this.endTime);
	}

	function exponentialAutomation(g) {
	g.gain.exponentialRampToValueAtTime(this.endValue, this.endTime);
	}

	// Basically want to test that if neither the start time nor end time is
	// on a frame boundary that we sample the automation curve correctly. The
	// start times and end times are mostly arbitrary, except that they cannot
	// be on a frame boundary.
	let testConfigs = [
	{
	desc: 'linearRamp',
	startTime: .1 / sampleRate,
	endTime: 128.1 / sampleRate,
	startValue: 1,
	endValue: 0,
	startValueThreshold: 1.201e-8,
	endValueThreshold: 1.526e-5,
	automationFunction: linearAutomation,
	expectedFunction: expectedLinear
	},
	{
	desc: 'linearRamp:short',
	startTime: .1 / sampleRate,
	endTime: 5.1 / sampleRate,
	startValue: 1,
	endValue: 0,
	startValueThreshold: 8.723e-9,
	endValueThreshold: 9.537e-7,
	automationFunction: linearAutomation,
	expectedFunction: expectedLinear
	},
	{
	desc: 'linearRamp:long',
	startTime: .1 / sampleRate,
	endTime: 200.1 / sampleRate,
	startValue: 1,
	endValue: 0,
	startValueThreshold: 2.827e-8,
	endValueThreshold: 4.674e-5,
	automationFunction: linearAutomation,
	expectedFunction: expectedLinear
	},
	{
	desc: 'exponentialRamp',
	startTime: .1 / sampleRate,
	endTime: 128.1 / sampleRate,
	startValue: 1,
	endValue: 1e-5,
	startValueThreshold: 2.505e-8,
	endValueThreshold: 1.484e-7,
	automationFunction: exponentialAutomation,
	expectedFunction: expectedExponential
	},
	{
	desc: 'exponentialRamp:short',
	startTime: .1 / sampleRate,
	endTime: 5.1 / sampleRate,
	startValue: 1,
	endValue: 1e-5,
	startValueThreshold: 5.027e-8,
	endValueThreshold: 3.821e-7,
	automationFunction: exponentialAutomation,
	expectedFunction: expectedExponential
	},
	{
	desc: 'exponentialRamp:long',
	startTime: .1 / sampleRate,
	endTime: 200.1 / sampleRate,
	startValue: 1,
	endValue: 1e-5,
	startValueThreshold: 8.035e-9,
	endValueThreshold: 1.337e-6,
	automationFunction: exponentialAutomation,
	expectedFunction: expectedExponential
	},
	];

	function createTaskFunction(config) {
	return (task, should) => {
	runTest(should, config).then(() => task.done());
	};
	}

	// Create all of the tasks from the test configs
	for (let k = 0; k < testConfigs.length; ++k) {
	let config = testConfigs[k];
	let taskName = config.desc + ':task' + k;
	audit.define(taskName, createTaskFunction(config));
	}

	audit.run();
	</script>
	</body>
	</html>