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| 1 <!doctype html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <script src="../resources/js-test.js"></script> | |
| 5 <script src="resources/compatibility.js"></script> | |
| 6 <script src="resources/audit-util.js"></script> | |
| 7 <script src="resources/audio-testing.js"></script> | |
| 8 <script src="resources/audioparam-testing.js"></script> | |
| 9 <title>Test Sampling of LinearRampToValueAtTime</title> | |
| 10 </head> | |
| 11 | |
| 12 <body> | |
| 13 <script> | |
| 14 description("Test Sampling of LinearRampToValueAtTime"); | |
| 15 | |
| 16 window.jsTestIsAsync = true; | |
| 17 var sampleRate = 12800; | |
| 18 var context; | |
| 19 | |
| 20 var audit = Audit.createTaskRunner(); | |
| 21 | |
| 22 function runTest(config) { | |
| 23 // Create a short context with a constant signal source connected to a g
ain node that will | |
| 24 // be automated. | |
| 25 context = new OfflineAudioContext(1, 256, sampleRate); | |
| 26 | |
| 27 // Create a constant unit amplitude source. | |
| 28 var source = context.createBufferSource(); | |
| 29 var b = createConstantBuffer(context, 1, 1); | |
| 30 source.buffer = b; | |
| 31 source.loop = true; | |
| 32 | |
| 33 // Gain node that is to be automated. | |
| 34 var gain = context.createGain(); | |
| 35 gain.gain.value = 0; | |
| 36 gain.gain.setValueAtTime(config.startValue, config.startTime); | |
| 37 config.automationFunction(gain); | |
| 38 | |
| 39 source.connect(gain); | |
| 40 gain.connect(context.destination); | |
| 41 | |
| 42 source.start(); | |
| 43 | |
| 44 return context.startRendering().then(function (resultBuffer) { | |
| 45 // Check that the automation has the correct sampling. | |
| 46 var resultData = resultBuffer.getChannelData(0); | |
| 47 | |
| 48 // The automation has starts at config.startTime, so the frame just af
ter this should have | |
| 49 // the automation applied. | |
| 50 var startFrame = Math.ceil(config.startTime * sampleRate); | |
| 51 | |
| 52 // The automation ends at config.endTime so the frame just before this
should have the | |
| 53 // automation applied. | |
| 54 var endFrame = Math.floor(config.endTime * sampleRate); | |
| 55 | |
| 56 // Use the true automation to find the expected values. | |
| 57 var expectedStart = config.expectedFunction(startFrame / sampleRate); | |
| 58 var expectedEnd = config.expectedFunction(endFrame / sampleRate); | |
| 59 | |
| 60 var success = Should(config.desc + ": Sample " + startFrame, | |
| 61 resultData[startFrame], { | |
| 62 precision: 7 | |
| 63 }).beCloseTo(expectedStart, config.startValueThreshold); | |
| 64 success = Should(config.desc + ": Sample " + endFrame, | |
| 65 resultData[endFrame], { | |
| 66 precision: 7 | |
| 67 }).beCloseTo(expectedEnd, config.endValueThreshold) && success; | |
| 68 | |
| 69 if (success) | |
| 70 testPassed(config.desc + " passed.\n"); | |
| 71 else | |
| 72 testFailed(config.desc + " failed.\n"); | |
| 73 }); | |
| 74 } | |
| 75 | |
| 76 function expectedLinear(t) { | |
| 77 var slope = (this.endValue - this.startValue) / (this.endTime - this.sta
rtTime); | |
| 78 return this.startValue + slope * (t - this.startTime); | |
| 79 }; | |
| 80 | |
| 81 function expectedExponential(t) { | |
| 82 var ratio = this.endValue / this.startValue; | |
| 83 var exponent = (t - this.startTime) / (this.endTime - this.startTime); | |
| 84 return this.startValue * Math.pow(ratio, exponent); | |
| 85 }; | |
| 86 | |
| 87 function linearAutomation(g) { | |
| 88 g.gain.linearRampToValueAtTime(this.endValue, this.endTime); | |
| 89 } | |
| 90 | |
| 91 function exponentialAutomation(g) { | |
| 92 g.gain.exponentialRampToValueAtTime(this.endValue, this.endTime); | |
| 93 } | |
| 94 | |
| 95 // Basically want to test that if neither the start time nor end time is o
n a frame boundary | |
| 96 // that we sample the automation curve correctly. The start times and end
times are mostly | |
| 97 // arbitrary, except that they cannot be on a frame boundary. | |
| 98 var testConfigs = [{ | |
| 99 desc: "linearRamp", | |
| 100 startTime: .1 / sampleRate, | |
| 101 endTime: 128.1 / sampleRate, | |
| 102 startValue: 1, | |
| 103 endValue: 0, | |
| 104 startValueThreshold: 1.201e-8, | |
| 105 endValueThreshold: 1.526e-5, | |
| 106 automationFunction: linearAutomation, | |
| 107 expectedFunction: expectedLinear | |
| 108 }, { | |
| 109 desc: "linearRamp:short", | |
| 110 startTime: .1 / sampleRate, | |
| 111 endTime: 5.1 / sampleRate, | |
| 112 startValue: 1, | |
| 113 endValue: 0, | |
| 114 startValueThreshold: 8.723e-9, | |
| 115 endValueThreshold: 9.537e-7, | |
| 116 automationFunction: linearAutomation, | |
| 117 expectedFunction: expectedLinear | |
| 118 }, { | |
| 119 desc: "linearRamp:long", | |
| 120 startTime: .1 / sampleRate, | |
| 121 endTime: 200.1 / sampleRate, | |
| 122 startValue: 1, | |
| 123 endValue: 0, | |
| 124 startValueThreshold: 2.827e-8, | |
| 125 endValueThreshold: 4.674e-5, | |
| 126 automationFunction: linearAutomation, | |
| 127 expectedFunction: expectedLinear | |
| 128 }, { | |
| 129 desc: "exponentialRamp", | |
| 130 startTime: .1 / sampleRate, | |
| 131 endTime: 128.1 / sampleRate, | |
| 132 startValue: 1, | |
| 133 endValue: 1e-5, | |
| 134 startValueThreshold: 2.505e-8, | |
| 135 endValueThreshold: 1.484e-7, | |
| 136 automationFunction: exponentialAutomation, | |
| 137 expectedFunction: expectedExponential | |
| 138 }, { | |
| 139 desc: "exponentialRamp:short", | |
| 140 startTime: .1 / sampleRate, | |
| 141 endTime: 5.1 / sampleRate, | |
| 142 startValue: 1, | |
| 143 endValue: 1e-5, | |
| 144 startValueThreshold: 5.027e-8, | |
| 145 endValueThreshold: 3.821e-7, | |
| 146 automationFunction: exponentialAutomation, | |
| 147 expectedFunction: expectedExponential | |
| 148 }, { | |
| 149 desc: "exponentialRamp:long", | |
| 150 startTime: .1 / sampleRate, | |
| 151 endTime: 200.1 / sampleRate, | |
| 152 startValue: 1, | |
| 153 endValue: 1e-5, | |
| 154 startValueThreshold: 8.035e-9, | |
| 155 endValueThreshold: 1.337e-6, | |
| 156 automationFunction: exponentialAutomation, | |
| 157 expectedFunction: expectedExponential | |
| 158 }, | |
| 159 ]; | |
| 160 | |
| 161 function createTaskFunction(config) { | |
| 162 return function (done) { | |
| 163 runTest(config).then(done); | |
| 164 }; | |
| 165 } | |
| 166 | |
| 167 // Create all of the tasks from the test configs | |
| 168 for (var k = 0; k < testConfigs.length; ++k) { | |
| 169 var config = testConfigs[k]; | |
| 170 var taskName = config.desc + ":task" + k; | |
| 171 audit.defineTask(taskName, createTaskFunction(config)); | |
| 172 } | |
| 173 | |
| 174 audit.defineTask("finish", function (done) { | |
| 175 finishJSTest(); | |
| 176 done(); | |
| 177 }); | |
| 178 | |
| 179 audit.runTasks(); | |
| 180 successfullyParsed = true; | |
| 181 </script> | |
| 182 </body> | |
| 183 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
