| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| Test AudioParam.setValueCurveAtTime |
| </title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/webaudio/resources/audit-util.js"></script> |
| <script src="/webaudio/resources/audit.js"></script> |
| <script src="/webaudio/resources/audioparam-testing.js"></script> |
| </head> |
| <body> |
| <script id="layout-test-code"> |
| let audit = Audit.createTaskRunner(); |
| |
| // 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. |
| let 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. |
| let maxAllowedError = 3.7194e-6; |
| |
| // The amplitude of the sine wave. |
| let sineAmplitude = 1; |
| |
| // Frequency of the sine wave. |
| let freqHz = 440; |
| |
| // Curve to use for setValueCurveAtTime(). |
| let curve; |
| |
| // Sets the curve data for the entire time interval. |
| function automation(value, startTime, endTime) { |
| gainNode.gain.setValueCurveAtTime( |
| curve, startTime, endTime - startTime); |
| } |
| |
| audit.define( |
| { |
| label: 'test', |
| description: 'AudioParam setValueCurveAtTime() functionality.' |
| }, |
| function(task, should) { |
| // The curve of values to use. |
| curve = createSineWaveArray( |
| timeInterval, freqHz, sineAmplitude, sampleRate); |
| |
| createAudioGraphAndTest( |
| task, should, numberOfTests, sineAmplitude, |
| function(k) { |
| // Don't need to set the value. |
| }, |
| automation, 'setValueCurveAtTime()', maxAllowedError, |
| createReferenceSineArray, |
| 2 * Math.PI * sineAmplitude * freqHz / sampleRate, |
| differenceErrorMetric); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
