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 for SetTargetAtTime</title> | |
| 9 </head> | |
| 10 | |
| 11 <body> | |
| 12 <div id="description"></div> | |
| 13 <div id="console"></div> | |
|
hongchan
2015/10/01 20:20:52
Please remove two lines above. These divs are crea
Raymond Toy
2015/10/01 21:30:50
Done
| |
| 14 | |
| 15 <script> | |
| 16 description("Test Sampling of SetTargetAtTime"); | |
| 17 | |
| 18 window.jsTestIsAsync = true; | |
| 19 // Some slow sample rate, but otherwise arbitrary. | |
| 20 var sampleRate = 12800; | |
| 21 | |
| 22 // Time constant for setTargetValue. Make it short, but is otherwise arbit rary. | |
| 23 var timeConstant = 10 / sampleRate; | |
| 24 | |
| 25 // Defaut initial gain for test. Arbitrary, but we want it large so the c hanges look large, | |
| 26 // even if the relative change isn't. | |
| 27 var initialGain = 10000; | |
| 28 | |
| 29 var audit = Audit.createTaskRunner(); | |
| 30 | |
| 31 // Test sampling of setTargetAtTime that starts at |startFrame|. A gain n ode is used for | |
| 32 // testing. |initializeGainFunction| initializes the gain value. | |
| 33 function doTest(message, startFrame, threshold, initializeGainFunction) { | |
| 34 var context = new OfflineAudioContext(1, 256, sampleRate); | |
| 35 var source = context.createBufferSource(); | |
| 36 var b = context.createBuffer(1, 1, sampleRate); | |
| 37 b.getChannelData(0)[0] = 1; | |
| 38 source.buffer = b; | |
| 39 source.loop = true; | |
| 40 | |
| 41 var gain = context.createGain(); | |
| 42 // Initialize the value of the gain node appropriately. | |
| 43 initializeGainFunction(gain); | |
| 44 gain.gain.setTargetAtTime(0, startFrame / sampleRate, timeConstant); | |
| 45 | |
| 46 source.connect(gain); | |
| 47 gain.connect(context.destination); | |
| 48 | |
| 49 source.start(); | |
| 50 | |
| 51 return context.startRendering().then(function (resultBuffer) { | |
| 52 // Verify that the sampling of the setTargetAtTime automation was done correctly. We just | |
| 53 // look at the sample just past the start of the automation. | |
| 54 var resultData = resultBuffer.getChannelData(0); | |
| 55 // Compute the true result at the frame just past startFrame and verif y that the actual | |
| 56 // rendered result is within |threshold| of the expected value. | |
| 57 var frame = Math.ceil(startFrame); | |
| 58 var v = 10000 * Math.exp(-(frame / sampleRate - startFrame / sampleRat e) / timeConstant); | |
| 59 Should(message + ": Target value at frame " + frame, resultData[frame] ).beCloseTo(v, threshold); | |
| 60 }); | |
| 61 } | |
| 62 | |
| 63 function initializeGainBySetter (g) { | |
| 64 g.gain.value = initialGain; | |
| 65 } | |
| 66 | |
| 67 function initializeGainBySetValue (g) { | |
| 68 g.gain.setValueAtTime(initialGain, 0); | |
| 69 } | |
| 70 | |
| 71 audit.defineTask("setValue;128.1", function (done) { | |
| 72 doTest("Initialize by setValueAtTime", 128.1, 3.6029e-8, initializeGainB ySetValue).then(done); | |
| 73 }); | |
| 74 | |
| 75 audit.defineTask("setValue;0.1", function (done) { | |
| 76 doTest("Initialize by setValueAtTime", 0.1, 3.6029e-8, initializeGainByS etValue).then(done); | |
| 77 }); | |
| 78 | |
| 79 audit.defineTask("setValue;0.0", function (done) { | |
| 80 doTest("Initialize by setValueAtTime", 0, 3.6029e-8, initializeGainBySet Value).then(done); | |
| 81 }); | |
| 82 | |
| 83 audit.defineTask("setter;128.1", function (done) { | |
| 84 doTest("Initialize by setter", 128.1, 3.6029e-8, initializeGainBySetter) .then(done); | |
| 85 }); | |
| 86 | |
| 87 audit.defineTask("setter;0.1", function (done) { | |
| 88 doTest("Initialize by setter", 0.1, 3.6029e-8, initializeGainBySetter).t hen(done); | |
| 89 }); | |
| 90 | |
| 91 audit.defineTask("setter;0.0", function (done) { | |
| 92 doTest("Initialize by setter", 0, 0, initializeGainBySetter).then(done); | |
| 93 }); | |
| 94 | |
| 95 | |
| 96 audit.defineTask("finish", function (done) { | |
| 97 finishJSTest(); | |
| 98 done(); | |
| 99 }); | |
| 100 | |
| 101 audit.runTasks(); | |
| 102 successfullyParsed = true; | |
| 103 </script> | |
| 104 </body> | |
| 105 </html> | |
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