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60 lines
2.2 KiB
HTML
60 lines
2.2 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>
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Test AudioParam.linearRampToValueAtTime
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</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/webaudio/resources/audit-util.js"></script>
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<script src="/webaudio/resources/audit.js"></script>
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<script src="/webaudio/resources/audioparam-testing.js"></script>
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</head>
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<body>
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<script id="layout-test-code">
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let audit = Audit.createTaskRunner();
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// Play a long DC signal out through an AudioGainNode, and call
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// setValueAtTime() and linearRampToValueAtTime() at regular intervals to
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// set the starting and ending values for a linear ramp. Each time
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// interval has a ramp with a different starting and ending value so that
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// there is a discontinuity at each time interval boundary. The
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// discontinuity is for testing timing. Also, we alternate between an
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// increasing and decreasing ramp for each interval.
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// Number of tests to run.
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let numberOfTests = 100;
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// Max allowed difference between the rendered data and the expected
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// result.
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let maxAllowedError = 1.865e-6;
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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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gainNode.gain.setValueAtTime(value, time);
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}
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// Generate a linear ramp ending at time |endTime| with an ending value of
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// |value|.
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function generateRamp(value, startTime, endTime){
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// |startTime| is ignored because the linear ramp uses the value from
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// the
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// setValueAtTime() call above.
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gainNode.gain.linearRampToValueAtTime(value, endTime)}
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audit.define(
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{
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label: 'test',
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description: 'AudioParam linearRampToValueAtTime() functionality'
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},
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function(task, should) {
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createAudioGraphAndTest(
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task, should, numberOfTests, 1, setValue, generateRamp,
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'linearRampToValueAtTime()', maxAllowedError,
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createLinearRampArray);
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});
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audit.run();
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</script>
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</body>
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</html>
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