| <!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.setTargetAtTime</title> |
| </head> |
| |
| <body> |
| <div id="description"></div> |
| <div id="console"></div> |
| |
| <script> |
| description("Test AudioParam setTargetAtTime() functionality."); |
| |
| // Play a long DC signal out through an AudioGainNode, and call setValueAtTime() and |
| // setTargetAtTime at regular intervals to set the starting value and the target |
| // value. Each time interval has a ramp with a different starting and target 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. |
| var numberOfTests = 100; |
| |
| // Max allowed difference between the rendered data and the expected result. |
| var maxAllowedError = 1.6953e-6; |
| |
| // The AudioGainNode starts with this value instead of the default value. |
| var 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 approach starting at |startTime| with a target value of |value|. |
| function automation(value, startTime, endTime) |
| { |
| // endTime is not used for setTargetAtTime. |
| gainNode.gain.setTargetAtTime(value, startTime, timeConstant) |
| } |
| |
| function runTest() |
| { |
| createAudioGraphAndTest(numberOfTests, |
| initialValue, |
| setValue, |
| automation, |
| "setTargetAtTime()", |
| maxAllowedError, |
| createExponentialApproachArray); |
| } |
| |
| runTest(); |
| successfullyParsed = true; |
| |
| </script> |
| |
| </body> |
| </html> |
