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| 1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> | |
| 2 <html> | |
| 3 <head> | |
| 4 <script src="../resources/js-test.js"></script> | |
| 5 <script src="resources/compatibility.js"></script> | |
| 6 </head> | |
| 7 | |
| 8 <body> | |
| 9 <div id="description"></div> | |
| 10 <div id="console"></div> | |
| 11 | |
| 12 <script> | |
| 13 description("Test WaveShaperNode including values outside the range of [-1
,1]"); | |
| 14 | |
| 15 var context; | |
| 16 var bufferData; | |
| 17 var outputData; | |
| 18 var reference; | |
| 19 | |
| 20 var sampleRate = 48000; | |
| 21 // Must be odd so we have an exact middle point. | |
| 22 var testFrames = 23; | |
| 23 var scale = 1 / ((testFrames - 1) / 2 - 1); | |
| 24 // Number of decimal digits to print | |
| 25 var decimals = 6; | |
| 26 // Required accuracy | |
| 27 var diffThreshold = Math.pow(10, -decimals); | |
| 28 | |
| 29 // Generate reference data | |
| 30 function generateReference() { | |
| 31 // The curve data is 0, 1, 0, and the input data is a ramp from -1+eps t
o 1+eps. Then the | |
| 32 // output is a ramp from 0 to 1 back to 0. | |
| 33 var ref = new Float32Array(testFrames); | |
| 34 var midPoint = (testFrames - 1) / 2; | |
| 35 // First sample is below -1 at -1-scale. | |
| 36 ref[0] = 0; | |
| 37 // Generate ramp up to the mid-point | |
| 38 for (var k = 0; k < midPoint; ++k) { | |
| 39 ref[k + 1] = k * scale; | |
| 40 } | |
| 41 // The value at the mid-point must be 1, from the curve | |
| 42 ref[midPoint] = 1; | |
| 43 // Generate a ramp from 1 down to 0 | |
| 44 for (var k = midPoint; k < testFrames - 1; ++k) { | |
| 45 ref[k + 1] = 2 - k * scale; | |
| 46 } | |
| 47 // The last sample is out of range at 1+scale | |
| 48 ref[testFrames - 1] = 0; | |
| 49 return ref; | |
| 50 } | |
| 51 | |
| 52 function checkResult (event) { | |
| 53 outputData = event.renderedBuffer.getChannelData(0); | |
| 54 reference = generateReference(); | |
| 55 var success = true; | |
| 56 // Verify that every output value matches our expected reference value. | |
| 57 for (var k = 0; k < outputData.length; ++k) { | |
| 58 var diff = outputData[k] - reference[k]; | |
| 59 if (Math.abs(diff) <= diffThreshold) { | |
| 60 testPassed(bufferData[k].toFixed(decimals) + " -> " + outputData[k
].toFixed(decimals) + "."); | |
| 61 } else { | |
| 62 testFailed(bufferData[k].toFixed(decimals) + " -> " + outputData[k
].toFixed(decimals) + ", but expected " + reference[k].toFixed(decimals) + "."); | |
| 63 success = false; | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 if (success) | |
| 68 testPassed("All outputs matched expected results."); | |
| 69 else | |
| 70 testFailed("Some outputs did not match expected results."); | |
| 71 | |
| 72 finishJSTest(); | |
| 73 } | |
| 74 | |
| 75 function runTest () { | |
| 76 if (window.testRunner) { | |
| 77 testRunner.dumpAsText(); | |
| 78 testRunner.waitUntilDone(); | |
| 79 } | |
| 80 | |
| 81 window.jsTestIsAsync = true; | |
| 82 | |
| 83 context = new OfflineAudioContext(1, testFrames, sampleRate); | |
| 84 // Create input values between -1.1 and 1.1 | |
| 85 var buffer = context.createBuffer(1, testFrames, context.sampleRate); | |
| 86 bufferData = buffer.getChannelData(0); | |
| 87 var start = -1 - scale; | |
| 88 for (var k = 0; k < testFrames; ++k) { | |
| 89 bufferData[k] = k * scale + start; | |
| 90 } | |
| 91 | |
| 92 var source = context.createBufferSource(); | |
| 93 source.buffer = buffer; | |
| 94 | |
| 95 // Create simple waveshaper. It should map -1 to 0, 0 to 1, and +1 to 0
and interpolate | |
| 96 // all points in between using a simple linear interpolator. | |
| 97 var shaper = context.createWaveShaper(); | |
| 98 var curve = new Float32Array(3); | |
| 99 curve[0] = 0; | |
| 100 curve[1] = 1; | |
| 101 curve[2] = 0; | |
| 102 shaper.curve = curve; | |
| 103 source.connect(shaper); | |
| 104 shaper.connect(context.destination); | |
| 105 | |
| 106 source.start(); | |
| 107 context.oncomplete = checkResult; | |
| 108 context.startRendering(); | |
| 109 } | |
| 110 | |
| 111 runTest(); | |
| 112 successfullyParsed = true; | |
| 113 </script> | |
| 114 </body> | |
| 115 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
