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Diffstat (limited to 'testing/web-platform/tests/webaudio/the-audio-api/the-waveshapernode-interface/curve-tests.html')
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diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-waveshapernode-interface/curve-tests.html b/testing/web-platform/tests/webaudio/the-audio-api/the-waveshapernode-interface/curve-tests.html new file mode 100644 index 000000000..791b74a6c --- /dev/null +++ b/testing/web-platform/tests/webaudio/the-audio-api/the-waveshapernode-interface/curve-tests.html @@ -0,0 +1,212 @@ +<!doctype html> +<html> +<head> + <title>WaveShaperNode interface - Curve tests | WebAudio</title> + + <script type="text/javascript" src="/resources/testharness.js"></script> + <script type="text/javascript" src="/resources/testharnessreport.js"></script> + <script type="text/javascript" src="../../js/vendor-prefixes.js"></script> +</head> +<body> + <div id="log"> + </div> + + <script type="text/javascript"> + var sampleRate=44100.0; + var tolerance=0.01; + + /* + Testing that -1, 0 and +1 map correctly to curve (with 1:1 correlation) + ======================================================================= + From the specification: + The input signal is nominally within the range -1 -> +1. + Each input sample within this range will index into the shaping curve with a signal level of zero corresponding + to the center value of the curve array. + */ + (function() { + var threeElementCurve=[2.0, -3.0, 4.0]; + var inputData=[-1.0, 0, 1.0]; + var expectedData=[2.0, -3.0, 4.0]; + executeTest(threeElementCurve, inputData, expectedData, "Testing that -1, 0 and +1 map correctly to curve (with 1:1 correlation)"); + })(); + + /* + Testing interpolation (where inputs don't correlate directly to curve elements) + =============================================================================== + From the specification: + The implementation must perform linear interpolation between adjacent points in the curve. + */ + (function() { + var threeElementCurve=[2.0, -3.0, 4.0]; + var inputData=[-0.5, +0.5, +0.75]; + var expectedData=[-0.5, +0.5, +2.25]; + executeTest(threeElementCurve, inputData, expectedData, "Testing interpolation (where inputs don't correlate directly to curve elements)"); + })(); + + /* + Testing out-of-range inputs (should be mapped to the first/last elements of the curve) + ====================================================================================== + From the specification: + Any sample value less than -1 will correspond to the first value in the curve array. + Any sample value greater than +1 will correspond to the last value in the curve array. + */ + (function() { + var threeElementCurve=[2.0, -3.0, 4.0]; + var inputData=[-1.5, +1.5]; + var expectedData=[2.0, 4.0]; + executeTest(threeElementCurve, inputData, expectedData, "Testing out-of-range inputs (should be mapped to the first/last elements of the curve)"); + })(); + + /* + Testing a 2-element curve (does not have a middle element) + ========================================================== + From the specification: + Each input sample within this range will index into the shaping curve with a signal level of zero corresponding + to the center value of the curve array. + The implementation must perform linear interpolation between adjacent points in the curve. + */ + (function() { + var twoElementCurve=[2.0, -2.0]; + var inputData=[-1.0, 0, 1.0]; + var expectedData=[2.0, 0.0, -2.0]; + executeTest(twoElementCurve, inputData, expectedData, "Testing a 2-element curve (does not have a middle element)"); + })(); + + /* + Testing a 4-element curve (does not have a middle element) + ========================================================== + From the specification: + Each input sample within this range will index into the shaping curve with a signal level of zero corresponding + to the center value of the curve array. + The implementation must perform linear interpolation between adjacent points in the curve. + */ + (function() { + var fourElementCurve=[1.0, 2.0, 4.0, 7.0]; + var inputData=[-1.0, 0, 1.0]; + var expectedData=[1.0, 3.0, 7.0]; + executeTest(fourElementCurve, inputData, expectedData, "Testing a 4-element curve (does not have a middle element)"); + })(); + + /* + Testing a huge curve + ==================== + From the specification: + Each input sample within this range will index into the shaping curve with a signal level of zero corresponding + to the center value of the curve array. + */ + (function() { + var bigCurve=[]; + for(var i=0;i<=60000;i++) { bigCurve.push(i/3.5435); } + var inputData=[-1.0, 0, 1.0]; + var expectedData=[bigCurve[0], bigCurve[30000], bigCurve[60000]]; + executeTest(bigCurve, inputData, expectedData, "Testing a huge curve"); + })(); + + /* + Testing single-element curve (boundary condition) + ================================================= + From the specification: + Each input sample within this range will index into the shaping curve with a signal level of zero corresponding + to the center value of the curve array. + Any sample value less than -1 will correspond to the first value in the curve array. + Any sample value greater than +1 will correspond to the last value in the curve array. + The implementation must perform linear interpolation between adjacent points in the curve. + Note: + I found a post on the W3C audio mailing list (from one of the Chris's) that suggested it would be feasible + to use the WaveShaperNode to create constant values. + */ + (function() { + var oneElementCurve=[1.0]; + var inputData=[-1.0, 0, 1.0, -2.0, 2.0]; + var expectedData=[1.0, 1.0, 1.0, 1.0, 1.0]; + executeTest(oneElementCurve, inputData, expectedData, "Testing single-element curve (boundary condition)"); + })(); + + /* + Testing null curve (should return input values) + =============================================== + From the specification: + Initially the curve attribute is null, which means that the WaveShaperNode will pass its input to its output + without modification. + */ + (function() { + var inputData=[-1.0, 0, 1.0, 2.0]; + var expectedData=[-1.0, 0.0, 1.0, 2.0]; + executeTest(null, inputData, expectedData, "Testing null curve (should return input values)"); + })(); + + /* + Testing zero-element curve (unspecified result) + =============================================== + From the specification: + Unspecified result (I assume it will be treated in the same way as a null curve). + Note: + Mozilla test_waveShaperNoCurve.html indicates they expect same results as a null curve. + */ + (function() { + var zeroElementCurve=[]; + var inputData=[-1.0, 0, 1.0, 2.0]; + var expectedData=[-1.0, 0.0, 1.0, 2.0]; + executeTest(zeroElementCurve, inputData, expectedData, "Testing zero-element curve (unspecified result)"); + })(); + + + /** + * Function that does the actual testing (using an asynchronous test). + * @param {?Array.<number>} curveData - Array containing values for the WaveShaper curve. + * @param {!Array.<number>} inputData - Array containing values for the input stream. + * @param {!Array.<number>} expectedData - Array containing expected results for each of the corresponding inputs. + * @param {!string} testName - Name of the test case. + */ + function executeTest(curveData, inputData, expectedData, testName) { + var stTest=async_test("WaveShaperNode - "+testName); + + // Create offline audio context. + var ac=new OfflineAudioContext(1, inputData.length, sampleRate); + + // Create the WaveShaper and its curve. + var waveShaper=ac.createWaveShaper(); + if(curveData!=null) { + var curve=new Float32Array(curveData.length); + for(var i=0;i<curveData.length;i++) { curve[i]=curveData[i]; } + waveShaper.curve=curve; + } + waveShaper.connect(ac.destination); + + // Create buffer containing the input values. + var inputBuffer=ac.createBuffer(1, Math.max(inputData.length, 2), sampleRate); + var d=inputBuffer.getChannelData(0); + for(var i=0;i<inputData.length;i++) { d[i]=inputData[i]; } + + // Play the input buffer through the WaveShaper. + var src=ac.createBufferSource(); + src.buffer=inputBuffer; + src.connect(waveShaper); + src.start(); + + // Test the outputs match the expected values. + ac.oncomplete=function(ev) { + var d=ev.renderedBuffer.getChannelData(0); + + stTest.step(function() { + for(var i=0;i<expectedData.length;i++) { + var curveText="null"; + if(curve!=null) { + if(curveData.length<20) { + curveText=curveData.join(","); + } else { + curveText="TooBigToDisplay ("+(curveData.length-1)+" elements)"; + } + } + var comment="Input="+inputData[i]+", Curve=["+curveText+"] >>> "; + assert_approx_equals(d[i], expectedData[i], tolerance, comment); + } + }); + + stTest.done(); + }; + ac.startRendering(); + } + </script> +</body> +</html> |