| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
| <html> |
| <head> |
| <script src="resources/compatibility.js"></script> |
| <script src="resources/audio-testing.js"></script> |
| <script src="resources/audioparam-testing.js"></script> |
| <script src="../resources/js-test.js"></script> |
| <title>Test AudioParam.setValueCurveAtTime</title> |
| </head> |
| |
| <body> |
| <div id="description"></div> |
| <div id="console"></div> |
| |
| <script> |
| description("Test AudioParam setValueCurveAtTime() functionality."); |
| |
| // Play a long DC signal out through an AudioGainNode and for each time interval call |
| // setValueCurveAtTime() to set the values for the duration of the interval. Each curve is a sine |
| // wave, and we assume that the time interval is not an exact multiple of the period. This causes a |
| // discontinuity between time intervals which is used to test timing. |
| |
| // Number of tests to run. |
| var numberOfTests = 20; |
| |
| // Max allowed difference between the rendered data and the expected result. Because of the linear |
| // interpolation, the rendered curve isn't exactly the same as the reference. This value is |
| // experimentally determined. |
| var maxAllowedError = 3.7194e-6; |
| |
| // The amplitude of the sine wave. |
| var sineAmplitude = 1; |
| |
| // Frequency of the sine wave. |
| var freqHz = 440; |
| |
| // Curve to use for setValueCurveAtTime(). |
| var curve; |
| |
| // Sets the curve data for the entire time interval. |
| function automation(value, startTime, endTime) |
| { |
| gainNode.gain.setValueCurveAtTime(curve, startTime, endTime - startTime); |
| } |
| |
| function runTest() |
| { |
| // The curve of values to use. |
| curve = createSineWaveArray(timeInterval, freqHz, sineAmplitude, sampleRate); |
| |
| createAudioGraphAndTest(numberOfTests, |
| sineAmplitude, |
| function(k) { |
| // Don't need to set the value. |
| }, |
| automation, |
| "setValueCurveAtTime()", |
| maxAllowedError, |
| createReferenceSineArray, |
| 2 * Math.PI * sineAmplitude * freqHz / sampleRate, |
| differenceErrorMetric); |
| } |
| |
| runTest(); |
| successfullyParsed = true; |
| |
| </script> |
| |
| </body> |
| </html> |
