| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| Test AudioParam.linearRampToValueAtTime |
| </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 call |
| // setValueAtTime() and linearRampToValueAtTime() at regular intervals to |
| // set the starting and ending values for a linear ramp. Each time |
| // interval has a ramp with a different starting and ending value so that |
| // there is a discontinuity at each time interval boundary. The |
| // discontinuity is for testing timing. Also, we alternate between an |
| // increasing and decreasing ramp for each interval. |
| |
| // Number of tests to run. |
| let numberOfTests = 100; |
| |
| // Max allowed difference between the rendered data and the expected |
| // result. |
| let maxAllowedError = 1.865e-6; |
| |
| // Set the gain node value to the specified value at the specified time. |
| function setValue(value, time) { |
| gainNode.gain.setValueAtTime(value, time); |
| } |
| |
| // Generate a linear ramp ending at time |endTime| with an ending value of |
| // |value|. |
| function generateRamp(value, startTime, endTime){ |
| // |startTime| is ignored because the linear ramp uses the value from |
| // the |
| // setValueAtTime() call above. |
| gainNode.gain.linearRampToValueAtTime(value, endTime)} |
| |
| audit.define( |
| { |
| label: 'test', |
| description: 'AudioParam linearRampToValueAtTime() functionality' |
| }, |
| function(task, should) { |
| createAudioGraphAndTest( |
| task, should, numberOfTests, 1, setValue, generateRamp, |
| 'linearRampToValueAtTime()', maxAllowedError, |
| createLinearRampArray); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
