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Update web-platform-tests to revision 0d318188757a9c996e20b82db201fd04de5aa255
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James Graham
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12321 changed files with 544385 additions and 6 deletions
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<!doctype html>
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<html>
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<head>
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<title>WaveShaperNode interface - Curve tests | WebAudio</title>
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<script type="text/javascript" src="../../../resources/testharness.js"></script>
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<script type="text/javascript" src="../../../resources/testharnessreport.js"></script>
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<script type="text/javascript" src="../../js/vendor-prefixes.js"></script>
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</head>
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<body>
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<div id="log">
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</div>
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<script type="text/javascript">
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var sampleRate=44100.0;
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var tolerance=0.01;
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/*
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Testing that -1, 0 and +1 map correctly to curve (with 1:1 correlation)
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=======================================================================
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From the specification:
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The input signal is nominally within the range -1 -> +1.
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Each input sample within this range will index into the shaping curve with a signal level of zero corresponding
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to the center value of the curve array.
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*/
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(function() {
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var threeElementCurve=[2.0, -3.0, 4.0];
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var inputData=[-1.0, 0, 1.0];
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var expectedData=[2.0, -3.0, 4.0];
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executeTest(threeElementCurve, inputData, expectedData, "Testing that -1, 0 and +1 map correctly to curve (with 1:1 correlation)");
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})();
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/*
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Testing interpolation (where inputs don't correlate directly to curve elements)
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===============================================================================
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From the specification:
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The implementation must perform linear interpolation between adjacent points in the curve.
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*/
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(function() {
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var threeElementCurve=[2.0, -3.0, 4.0];
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var inputData=[-0.5, +0.5, +0.75];
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var expectedData=[-0.5, +0.5, +2.25];
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executeTest(threeElementCurve, inputData, expectedData, "Testing interpolation (where inputs don't correlate directly to curve elements)");
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})();
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/*
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Testing out-of-range inputs (should be mapped to the first/last elements of the curve)
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======================================================================================
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From the specification:
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Any sample value less than -1 will correspond to the first value in the curve array.
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Any sample value greater than +1 will correspond to the last value in the curve array.
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*/
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(function() {
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var threeElementCurve=[2.0, -3.0, 4.0];
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var inputData=[-1.5, +1.5];
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var expectedData=[2.0, 4.0];
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executeTest(threeElementCurve, inputData, expectedData, "Testing out-of-range inputs (should be mapped to the first/last elements of the curve)");
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})();
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/*
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Testing a 2-element curve (does not have a middle element)
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==========================================================
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From the specification:
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Each input sample within this range will index into the shaping curve with a signal level of zero corresponding
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to the center value of the curve array.
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The implementation must perform linear interpolation between adjacent points in the curve.
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*/
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(function() {
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var twoElementCurve=[2.0, -2.0];
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var inputData=[-1.0, 0, 1.0];
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var expectedData=[2.0, 0.0, -2.0];
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executeTest(twoElementCurve, inputData, expectedData, "Testing a 2-element curve (does not have a middle element)");
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})();
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/*
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Testing a 4-element curve (does not have a middle element)
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==========================================================
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From the specification:
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Each input sample within this range will index into the shaping curve with a signal level of zero corresponding
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to the center value of the curve array.
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The implementation must perform linear interpolation between adjacent points in the curve.
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*/
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(function() {
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var fourElementCurve=[1.0, 2.0, 4.0, 7.0];
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var inputData=[-1.0, 0, 1.0];
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var expectedData=[1.0, 3.0, 7.0];
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executeTest(fourElementCurve, inputData, expectedData, "Testing a 4-element curve (does not have a middle element)");
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})();
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/*
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Testing a huge curve
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====================
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From the specification:
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Each input sample within this range will index into the shaping curve with a signal level of zero corresponding
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to the center value of the curve array.
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*/
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(function() {
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var bigCurve=[];
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for(var i=0;i<=60000;i++) { bigCurve.push(i/3.5435); }
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var inputData=[-1.0, 0, 1.0];
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var expectedData=[bigCurve[0], bigCurve[30000], bigCurve[60000]];
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executeTest(bigCurve, inputData, expectedData, "Testing a huge curve");
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})();
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/*
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Testing single-element curve (boundary condition)
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=================================================
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From the specification:
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Each input sample within this range will index into the shaping curve with a signal level of zero corresponding
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to the center value of the curve array.
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Any sample value less than -1 will correspond to the first value in the curve array.
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Any sample value greater than +1 will correspond to the last value in the curve array.
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The implementation must perform linear interpolation between adjacent points in the curve.
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Note:
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I found a post on the W3C audio mailing list (from one of the Chris's) that suggested it would be feasible
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to use the WaveShaperNode to create constant values.
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*/
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(function() {
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var oneElementCurve=[1.0];
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var inputData=[-1.0, 0, 1.0, -2.0, 2.0];
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var expectedData=[1.0, 1.0, 1.0, 1.0, 1.0];
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executeTest(oneElementCurve, inputData, expectedData, "Testing single-element curve (boundary condition)");
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})();
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/*
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Testing null curve (should return input values)
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===============================================
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From the specification:
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Initially the curve attribute is null, which means that the WaveShaperNode will pass its input to its output
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without modification.
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*/
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(function() {
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var inputData=[-1.0, 0, 1.0, 2.0];
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var expectedData=[-1.0, 0.0, 1.0, 2.0];
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executeTest(null, inputData, expectedData, "Testing null curve (should return input values)");
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})();
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/*
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Testing zero-element curve (unspecified result)
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===============================================
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From the specification:
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Unspecified result (I assume it will be treated in the same way as a null curve).
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Note:
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Mozilla test_waveShaperNoCurve.html indicates they expect same results as a null curve.
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*/
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(function() {
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var zeroElementCurve=[];
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var inputData=[-1.0, 0, 1.0, 2.0];
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var expectedData=[-1.0, 0.0, 1.0, 2.0];
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executeTest(zeroElementCurve, inputData, expectedData, "Testing zero-element curve (unspecified result)");
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})();
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/**
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* Function that does the actual testing (using an asynchronous test).
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* @param {?Array.<number>} curveData - Array containing values for the WaveShaper curve.
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* @param {!Array.<number>} inputData - Array containing values for the input stream.
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* @param {!Array.<number>} expectedData - Array containing expected results for each of the corresponding inputs.
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* @param {!string} testName - Name of the test case.
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*/
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function executeTest(curveData, inputData, expectedData, testName) {
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var stTest=async_test("WaveShaperNode - "+testName);
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// Create offline audio context.
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var ac=new OfflineAudioContext(1, inputData.length, sampleRate);
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// Create the WaveShaper and its curve.
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var waveShaper=ac.createWaveShaper();
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if(curveData!=null) {
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var curve=new Float32Array(curveData.length);
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for(var i=0;i<curveData.length;i++) { curve[i]=curveData[i]; }
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waveShaper.curve=curve;
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}
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waveShaper.connect(ac.destination);
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// Create buffer containing the input values.
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var inputBuffer=ac.createBuffer(1, Math.max(inputData.length, 2), sampleRate);
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var d=inputBuffer.getChannelData(0);
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for(var i=0;i<inputData.length;i++) { d[i]=inputData[i]; }
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// Play the input buffer through the WaveShaper.
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var src=ac.createBufferSource();
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src.buffer=inputBuffer;
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src.connect(waveShaper);
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src.start();
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// Test the outputs match the expected values.
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ac.oncomplete=function(ev) {
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var d=ev.renderedBuffer.getChannelData(0);
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stTest.step(function() {
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for(var i=0;i<expectedData.length;i++) {
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var curveText="null";
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if(curve!=null) {
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if(curveData.length<20) {
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curveText=curveData.join(",");
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} else {
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curveText="TooBigToDisplay ("+(curveData.length-1)+" elements)";
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}
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}
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var comment="Input="+inputData[i]+", Curve=["+curveText+"] >>> ";
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assert_approx_equals(d[i], expectedData[i], tolerance, comment);
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}
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});
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stTest.done();
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};
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ac.startRendering();
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}
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</script>
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</body>
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</html>
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