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<!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>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<script>
description("Test AudioParam linearRampToValueAtTime() functionality.");
// 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.
var numberOfTests = 100;
// Max allowed difference between the rendered data and the expected result.
var maxAllowedError = 6.5e-7;
// 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)
}
function runTest()
{
createAudioGraphAndTest(numberOfTests,
1,
setValue,
generateRamp,
"linearRampToValueAtTime()",
maxAllowedError,
createLinearRampArray);
}
runTest();
successfullyParsed = true;
</script>
</body>
</html>
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