| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
| <html> |
| <head> |
| <script src="resources/audio-testing.js"></script> |
| <script src="resources/audioparam-testing-legacy.js"></script> |
| <script src="../resources/js-test-pre.js"></script> |
| </head> |
| |
| <body> |
| <div id="description"></div> |
| <div id="console"></div> |
| |
| <script> |
| description("Test AudioParam exponentialRampToValueAtTime() functionality."); |
| |
| // 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. |
| var numberOfTests = 100; |
| |
| // Max allowed difference between the rendered data and the expected result. |
| var maxAllowedError = 6.75e-4; |
| |
| // 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 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) |
| } |
| |
| function runTest() |
| { |
| createAudioGraphAndTest(numberOfTests, |
| initialValue, |
| setValue, |
| generateRamp, |
| "exponentialRampToValueAtTime()", |
| maxAllowedError, |
| createExponentialRampArray); |
| |
| } |
| |
| runTest(); |
| successfullyParsed = true; |
| |
| </script> |
| |
| <script src="../resources/js-test-post.js"></script> |
| </body> |
| </html> |
