Chromium Code Reviews Chromium Code Reviews
Issue 1377903002:
Use frames instead of time for running AudioParam timelines. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master| OLD | NEW |
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| (Empty) | |
| 1 <!doctype html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <script src="resources/compatibility.js"></script> | |
| 5 <script src="resources/audio-testing.js"></script> | |
| 6 <script src="resources/audioparam-testing.js"></script> | |
| 7 <script src="../resources/js-test.js"></script> | |
| 8 <title>Test Sampling of LinearRampToValueAtTime</title> | |
| 9 </head> | |
| 10 | |
| 11 <body> | |
| 12 <div id="description"></div> | |
| 13 <div id="console"></div> | |
| 14 | |
| 15 <script> | |
| 16 description("Test Sampling of LinearRampToValueAtTime"); | |
| 17 | |
| 18 window.jsTestIsAsync = true; | |
| 19 var sampleRate = 12800; | |
| 20 var context; | |
| 21 | |
| 22 var audit = Audit.createTaskRunner(); | |
| 23 | |
| 24 function runTest(config) { | |
| 25 // Create a short context with a constant signal source connected to a g ain node that will | |
| 26 // be automated. | |
| 27 context = new OfflineAudioContext(1, 256, sampleRate); | |
| 28 | |
| 29 // Create a constant unit amplitude source. | |
| 30 var source = context.createBufferSource(); | |
| 31 var b = createConstantBuffer(context, 1, 1); | |
| 32 source.buffer = b; | |
| 33 source.loop = true; | |
| 34 | |
| 35 // Gain node that is to be automated. | |
| 36 var gain = context.createGain(); | |
| 37 gain.gain.value = 0; | |
| 38 gain.gain.setValueAtTime(config.startValue, config.startTime); | |
| 39 config.automationFunction(gain); | |
| 40 | |
| 41 source.connect(gain); | |
| 42 gain.connect(context.destination); | |
| 43 | |
| 44 source.start(); | |
| 45 | |
| 46 return context.startRendering().then(function (resultBuffer) { | |
| 47 // Check that the automation has the correct sampling. | |
| 48 var resultData = resultBuffer.getChannelData(0); | |
| 49 | |
| 50 // The automation has starts at config.startTime, so the frame just af ter this should have | |
| 51 // the automation applied. | |
| 52 var startFrame = Math.ceil(config.startTime * sampleRate); | |
| 53 | |
| 54 // The automation ends at config.endTime so the frame just before this should have the | |
| 55 // automation applied. | |
| 56 var endFrame = Math.floor(config.endTime * sampleRate); | |
| 57 | |
| 58 // Use the true automation to find the expected values. | |
| 59 var expectedStart = config.expectedFunction(startFrame / sampleRate); | |
| 60 var expectedEnd = config.expectedFunction(endFrame / sampleRate); | |
| 61 | |
| 62 var success = Should(config.desc + ": Sample " + startFrame, | |
| 63 resultData[startFrame]).beCloseTo(expectedStart, config.startValueTh reshold, 7); | |
| 64 success = Should(config.desc + ": Sample " + endFrame, | |
| 65 resultData[endFrame]).beCloseTo(expectedEnd, config.endValueThreshol d, 7) && success; | |
| 66 | |
| 67 if (success) | |
| 68 testPassed(config.desc + " passed.\n"); | |
| 69 else | |
| 70 testFailed(config.desc + " failed.\n"); | |
| 71 }); | |
| 72 } | |
| 73 | |
| 74 function expectedLinear(t) { | |
| 75 var slope = (this.endValue - this.startValue) / (this.endTime - this.sta rtTime); | |
| 76 return this.startValue + slope * (t - this.startTime); | |
| 77 }; | |
| 78 | |
| 79 function expectedExponential(t) { | |
| 80 var ratio = this.endValue / this.startValue; | |
| 81 var exponent = (t - this.startTime) / (this.endTime - this.startTime); | |
| 82 return this.startValue * Math.pow(ratio, exponent); | |
| 83 }; | |
| 84 | |
| 85 function linearAutomation(g) { | |
| 86 g.gain.linearRampToValueAtTime(this.endValue, this.endTime); | |
| 87 } | |
| 88 | |
| 89 function exponentialAutomation(g) { | |
| 90 g.gain.exponentialRampToValueAtTime(this.endValue, this.endTime); | |
| 91 } | |
| 92 | |
| 93 // Basically want to test that if neither the start time nor end time is o n a frame boundary | |
| 94 // that we sample the automation curve correctly. The start times and end times are mostly | |
| 95 // arbitrary, except that they cannot be on a frame boundary. | |
| 96 var testConfigs = [{ | |
| 97 desc: "linearRamp", | |
| 98 startTime: .1 / sampleRate, | |
| 99 endTime: 128.1 / sampleRate, | |
| 100 startValue: 1, | |
| 101 endValue: 0, | |
| 102 startValueThreshold: 1.201e-8, | |
| 103 endValueThreshold: 1.526e-5, | |
| 104 automationFunction: linearAutomation, | |
| 105 expectedFunction: expectedLinear | |
| 106 }, { | |
| 107 desc: "linearRamp:short", | |
| 108 startTime: .1 / sampleRate, | |
| 109 endTime: 5.1 / sampleRate, | |
| 110 startValue: 1, | |
| 111 endValue: 0, | |
| 112 startValueThreshold: 8.723e-9, | |
| 113 endValueThreshold: 9.537e-7, | |
| 114 automationFunction: linearAutomation, | |
| 115 expectedFunction: expectedLinear | |
| 116 }, { | |
| 117 desc: "linearRamp:long", | |
| 118 startTime: .1 / sampleRate, | |
| 119 endTime: 200.1 / sampleRate, | |
| 120 startValue: 1, | |
| 121 endValue: 0, | |
| 122 startValueThreshold: 2.827e-8, | |
| 123 endValueThreshold: 4.674e-5, | |
| 124 automationFunction: linearAutomation, | |
| 125 expectedFunction: expectedLinear | |
| 126 }, { | |
| 127 desc: "exponentialRamp", | |
| 128 startTime: .1 / sampleRate, | |
| 129 endTime: 128.1 / sampleRate, | |
| 130 startValue: 1, | |
| 131 endValue: 1e-5, | |
| 132 startValueThreshold: 2.505e-8, | |
| 133 endValueThreshold: 1.484e-7, | |
| 134 automationFunction: exponentialAutomation, | |
| 135 expectedFunction: expectedExponential | |
| 136 }, { | |
| 137 desc: "exponentialRamp:short", | |
| 138 startTime: .1 / sampleRate, | |
| 139 endTime: 5.1 / sampleRate, | |
| 140 startValue: 1, | |
| 141 endValue: 1e-5, | |
| 142 startValueThreshold: 5.027e-8, | |
| 143 endValueThreshold: 3.821e-7, | |
| 144 automationFunction: exponentialAutomation, | |
| 145 expectedFunction: expectedExponential | |
| 146 }, { | |
| 147 desc: "exponentialRamp:long", | |
| 148 startTime: .1 / sampleRate, | |
| 149 endTime: 200.1 / sampleRate, | |
| 150 startValue: 1, | |
| 151 endValue: 1e-5, | |
| 152 startValueThreshold: 8.035e-9, | |
| 153 endValueThreshold: 1.337e-6, | |
| 154 automationFunction: exponentialAutomation, | |
| 155 expectedFunction: expectedExponential | |
| 156 }, | |
| 157 ]; | |
| 158 | |
| 159 function createTaskFunction(config) { | |
| 160 return function (done) { | |
| 161 runTest(config).then(done); | |
| 162 }; | |
| 163 } | |
| 164 | |
| 165 // Create all of the tasks from the test configs | |
| 166 for (var k = 0; k < testConfigs.length; ++k) { | |
| 167 var config = testConfigs[k]; | |
| 168 var taskName = config.desc + ":task" + k; | |
| 169 audit.defineTask(taskName, createTaskFunction(config)); | |
| 170 } | |
| 171 | |
| 172 audit.defineTask("finish", function (done) { | |
| 173 finishJSTest(); | |
| 174 done(); | |
| 175 }); audit.runTasks(); | |
|
hongchan
2015/09/30 22:14:18
Add a line break here.
Raymond Toy
2015/10/01 18:05:55
Done.
| |
| 176 successfullyParsed = true; | |
| 177 </script> | |
| 178 </body> | |
| 179 </html> | |
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