66 lines
2.3 KiB
HTML
66 lines
2.3 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<script src="resources/audio-testing.js"></script>
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<script src="resources/audioparam-testing-legacy.js"></script>
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<script src="../resources/js-test-pre.js"></script>
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</head>
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<body>
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<div id="description"></div>
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<div id="console"></div>
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<script>
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description("Test AudioParam exponentialRampToValueAtTime() functionality.");
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// Play a long DC signal out through an AudioGainNode, and call setValueAtTime() and
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// exponentialRampToValueAtTime() at regular intervals to set the starting and ending values
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// for an exponential ramp. Each time interval has a ramp with a different starting and
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// ending value so that there is a discontinuity at each time interval boundary. The
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// discontinuity is for testing timing. Also, we alternate between an increasing and
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// decreasing ramp for each interval.
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// Number of tests to run.
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var numberOfTests = 100;
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// Max allowed difference between the rendered data and the expected result.
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var maxAllowedError = 6.75e-4;
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// The AudioGainNode starts with this value instead of the default value.
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var initialValue = 100;
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// Set the gain node value to the specified value at the specified time.
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function setValue(value, time)
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{
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gainNode.gain.setValueAtTime(value, time);
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}
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// Generate an exponential ramp ending at time |endTime| with an ending value of |value|.
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function generateRamp(value, startTime, endTime)
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{
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// |startTime| is ignored because the exponential ramp
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// uses the value from the setValueAtTime() call above.
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gainNode.gain.exponentialRampToValueAtTime(value, endTime)
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}
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function runTest()
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{
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createAudioGraphAndTest(numberOfTests,
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initialValue,
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setValue,
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generateRamp,
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"exponentialRampToValueAtTime()",
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maxAllowedError,
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createExponentialRampArray);
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}
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runTest();
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successfullyParsed = true;
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</script>
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<script src="../resources/js-test-post.js"></script>
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</body>
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</html>
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