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| 1 <!doctype html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test WaveShaper Copies Curve Data</title> | |
| 5 <script src="../resources/testharness.js"></script> | |
| 6 <script src="../resources/testharnessreport.js"></script> | |
| 7 <script src="resources/audit-util.js"></script> | |
| 8 <script src="resources/audio-testing.js"></script> | |
| 9 </head> | |
| 10 | |
| 11 <body> | |
| 12 <script> | |
| 13 // Sample rate and number of frames are fairly arbitrary. We need to | |
| 14 // render, however, at least 384 frames. 1024 is a nice small value. | |
| 15 var sampleRate = 16000; | |
| 16 var renderFrames = 1024; | |
| 17 | |
| 18 var audit = Audit.createTaskRunner(); | |
| 19 | |
| 20 audit.defineTask("test copying", function (taskDone) { | |
| 21 // Two-channel context; channel 0 contains the test data and channel 1 | |
| 22 // contains the expected result. Channel 1 has the normal WaveShaper | |
| 23 // output and channel 0 has the WaveShaper output with a modified curve. | |
| 24 var context = new OfflineAudioContext(2, renderFrames, sampleRate); | |
| 25 | |
| 26 // Just use a default oscillator as the source. Doesn't really matter | |
| 27 // what we use. | |
| 28 var src = context.createOscillator(); | |
| 29 src.type = "sawtooth"; | |
| 30 | |
| 31 // Create the wave shapers: ws0 is the test shaper, and ws1 is the | |
| 32 // reference wave shaper. | |
| 33 var ws0 = context.createWaveShaper(); | |
| 34 var ws1 = context.createWaveShaper(); | |
| 35 | |
| 36 // Wave shaper curves. Doesn't really matter what we use as long as it | |
| 37 // modifies the input in some way. Thus, keep it simple and just invert | |
| 38 // the input. | |
| 39 var desiredCurve = [1, 0, -1]; | |
| 40 var curve0 = Float32Array.from(desiredCurve); | |
| 41 var curve1 = Float32Array.from(desiredCurve); | |
| 42 | |
| 43 ws0.curve = curve0; | |
| 44 ws1.curve = curve1; | |
| 45 | |
| 46 var merger = context.createChannelMerger(2); | |
| 47 | |
| 48 // Connect the graph | |
| 49 src.connect(ws0); | |
| 50 src.connect(ws1); | |
| 51 | |
| 52 ws0.connect(merger, 0, 0); | |
| 53 ws1.connect(merger, 0, 1); | |
| 54 | |
| 55 merger.connect(context.destination); | |
| 56 | |
| 57 // Let the context run for a bit and then modify the curve for ws0. | |
| 58 // Doesn't really matter what we modify the curve to as long as it's | |
| 59 // different. | |
| 60 context.suspend(256 / context.sampleRate) | |
| 61 .then(function () { | |
| 62 curve0[0] = -0.5; | |
| 63 curve0[1] = 0.125; | |
| 64 curve0[2] = 0.75; | |
| 65 }) | |
| 66 .then(context.resume.bind(context)); | |
| 67 | |
| 68 src.start(); | |
| 69 | |
| 70 context.startRendering().then(function (renderedBuffer) { | |
| 71 var actual = renderedBuffer.getChannelData(0); | |
| 72 var expected = renderedBuffer.getChannelData(1); | |
| 73 | |
| 74 // Modifying the wave shaper curve should not modify the output so the | |
| 75 // outputs from the two wave shaper nodes should be exactly identical. | |
| 76 var success = Should("WaveShaper with modified curve", actual) | |
| 77 .beEqualToArray(expected); | |
| 78 | |
| 79 Should("Summary: ", success).summarize( | |
| 80 "Output correctly did not change with modified WaveShaper curve.", | |
| 81 "Output incorrectly changed due to modified WaveShaper curve."); | |
| 82 }).then(taskDone); | |
| 83 }); | |
| 84 | |
| 85 audit.runTasks(); | |
| 86 </script> | |
| 87 </body> | |
| 88 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
