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<title>
Test setValueCurveAtTime Copies the Curve Data
</title>
<script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../resources/audit-util.js"></script>
<script src="../resources/audit.js"></script>
<script src="../resources/panner-formulas.js"></script>
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<body>
<script id="layout-test-code">
let sampleRate = 48000;
let renderFrames = 1024;
let renderDuration = renderFrames / sampleRate;
let audit = Audit.createTaskRunner();
// Test that changing the curve array to setValueCurveAtTime doesn't
// change the automation output.
audit.define('test-copy', (task, should) => {
// Two-channel context; channel 0 is the test result, and channel 1 is
// the expected result.
let context = new OfflineAudioContext(2, renderFrames, sampleRate);
let source = context.createBufferSource();
source.buffer = createConstantBuffer(context, 1, 1);
source.loop = true;
// Create two gain nodes. gainRef is the reference with the expected
// automation results. gainTest is the test which will have the curve
// modified.
let gainTest = context.createGain();
let gainRef = context.createGain();
let merger = context.createChannelMerger(2);
// The actual curve data can be anything, but we use this for
// simplicity.
let curveData = [1, 0];
let curveRef = Float32Array.from(curveData);
let curveTest = Float32Array.from(curveData);
// Create the graph.
source.connect(gainTest);
source.connect(gainRef);
gainTest.connect(merger, 0, 0);
gainRef.connect(merger, 0, 1);
merger.connect(context.destination);
// Initialize the gains.
gainTest.gain.setValueAtTime(0, 0);
gainRef.gain.setValueAtTime(0, 0);
// Set up the value curve. At this point curveTest and curveRef are the
// same.
gainTest.gain.setValueCurveAtTime(curveTest, 0, renderDuration);
gainRef.gain.setValueCurveAtTime(curveRef, 0, renderDuration);
// After rendering has started, modify curveTest.
context.suspend(128 / sampleRate)
.then(function() {
// Change the values of curve now. Any transformation is ok as
// long as curveTest changes. We do this to make it really
// obvious.
for (let k = 0; k < curveTest.length; ++k)
curveTest[k] = 100 * curveTest[k] + 1;
})
.then(context.resume.bind(context));
// Start the test!
source.start();
context.startRendering()
.then(function(resultBuffer) {
let testData = resultBuffer.getChannelData(0);
let refData = resultBuffer.getChannelData(1);
// The test result and the reference should be identical since
// changing the curve data should not affect the automation.
should(testData, 'setValueCurve output').beEqualToArray(refData);
})
.then(() => task.done());
});
audit.run();
</script>
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