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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 <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 AudioParam.setValueCurveAtTime</title> | |
| 10 </head> | |
| 11 | |
| 12 <body> | |
| 13 <div id="description"></div> | |
| 14 <div id="console"></div> | |
| 15 | |
| 16 <script> | |
| 17 description("Test AudioParam setValueCurveAtTime() functionality."); | |
| 18 | |
| 19 // Play a long DC signal out through an AudioGainNode and for each time interval
call | |
| 20 // setValueCurveAtTime() to set the values for the duration of the interval. Ea
ch curve is a sine | |
| 21 // wave, and we assume that the time interval is not an exact multiple of the pe
riod. This causes a | |
| 22 // discontinuity between time intervals which is used to test timing. | |
| 23 | |
| 24 // Number of tests to run. | |
| 25 var numberOfTests = 20; | |
| 26 | |
| 27 // Max allowed difference between the rendered data and the expected result. Be
cause of the linear | |
| 28 // interpolation, the rendered curve isn't exactly the same as the reference. T
his value is | |
| 29 // experimentally determined. | |
| 30 var maxAllowedError = 3.7194e-6; | |
| 31 | |
| 32 // The amplitude of the sine wave. | |
| 33 var sineAmplitude = 1; | |
| 34 | |
| 35 // Frequency of the sine wave. | |
| 36 var freqHz = 440; | |
| 37 | |
| 38 // Curve to use for setValueCurveAtTime(). | |
| 39 var curve; | |
| 40 | |
| 41 // Sets the curve data for the entire time interval. | |
| 42 function automation(value, startTime, endTime) | |
| 43 { | |
| 44 gainNode.gain.setValueCurveAtTime(curve, startTime, endTime - startTime); | |
| 45 } | |
| 46 | |
| 47 function runTest() | |
| 48 { | |
| 49 // The curve of values to use. | |
| 50 curve = createSineWaveArray(timeInterval, freqHz, sineAmplitude, sampleRate)
; | |
| 51 | |
| 52 createAudioGraphAndTest(numberOfTests, | |
| 53 sineAmplitude, | |
| 54 function(k) { | |
| 55 // Don't need to set the value. | |
| 56 }, | |
| 57 automation, | |
| 58 "setValueCurveAtTime()", | |
| 59 maxAllowedError, | |
| 60 createReferenceSineArray, | |
| 61 2 * Math.PI * sineAmplitude * freqHz / sampleRate, | |
| 62 differenceErrorMetric); | |
| 63 } | |
| 64 | |
| 65 runTest(); | |
| 66 successfullyParsed = true; | |
| 67 | |
| 68 </script> | |
| 69 | |
| 70 </body> | |
| 71 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
