| <!DOCTYPE html> |
| <html> |
| <head> |
| <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> |
| </head> |
| <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> |
| </body> |
| </html> |
