| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| Test AudioParam.exponentialRampToValueAtTime |
| </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 exponentialRampToValueAtTime() at regular |
| // intervals to set the starting and ending values for an exponential |
| // 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 = 1.222e-5; |
| |
| // The AudioGainNode starts with this value instead of the default value. |
| let initialValue = 100; |
| |
| // Set the gain node value to the specified value at the specified time. |
| function setValue(value, time) { |
| gainNode.gain.setValueAtTime(value, time); |
| } |
| |
| // Generate an exponential ramp ending at time |endTime| with an ending |
| // value of |value|. |
| function generateRamp(value, startTime, endTime){ |
| // |startTime| is ignored because the exponential ramp |
| // uses the value from the setValueAtTime() call above. |
| gainNode.gain.exponentialRampToValueAtTime(value, endTime)} |
| |
| audit.define( |
| { |
| label: 'test', |
| description: |
| 'AudioParam exponentialRampToValueAtTime() functionality' |
| }, |
| function(task, should) { |
| createAudioGraphAndTest( |
| task, should, numberOfTests, initialValue, setValue, |
| generateRamp, 'exponentialRampToValueAtTime()', maxAllowedError, |
| createExponentialRampArray); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
