| <!doctype html> |
| <html> |
| <head> |
| <script src="../resources/js-test.js"></script> |
| <script src="resources/compatibility.js"></script> |
| <script src="resources/audio-testing.js"></script> |
| <script src="resources/panner-formulas.js"></script> |
| <title>Test setValueCurveAtTime Copies the Curve Data</title> |
| </head> |
| |
| <body> |
| <script> |
| description("Test setValueCurveAtTime Copies the Curve Data"); |
| window.jsTestIsAsync = true; |
| |
| var sampleRate = 48000; |
| var renderFrames = 1024; |
| var renderDuration = renderFrames / sampleRate; |
| |
| var audit = Audit.createTaskRunner(); |
| |
| // Test that changing the curve array to setValueCurveAtTime doesn't |
| // change the automation output. |
| audit.defineTask("test-copy", function (done) { |
| // Two-channel context; channel 0 is the test result, and channel 1 is |
| // the expected result. |
| var context = new OfflineAudioContext(2, renderFrames, sampleRate); |
| |
| var 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. |
| var gainTest = context.createGain(); |
| var gainRef = context.createGain(); |
| |
| var merger = context.createChannelMerger(2); |
| |
| // The actual curve data can be anything, but we use this for |
| // simplicity. |
| var curveData = [1, 0]; |
| var curveRef = Float32Array.from(curveData); |
| var 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 (var 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) { |
| var testData = resultBuffer.getChannelData(0); |
| var refData = resultBuffer.getChannelData(1); |
| |
| // The test result and the reference should be identical since |
| // changing the curve data should not affect the automation. |
| var success = Should("setValueCurve output", testData).beEqualToArray(refData); |
| |
| if (success) |
| testPassed("Changing the curve data did not change the result."); |
| else |
| testFailed("Changing the curve data unexpectedly changed the result."); |
| }).then(done); |
| }); |
| |
| audit.defineTask("finish", function (done) { |
| finishJSTest(); |
| done(); |
| }); |
| |
| audit.runTasks(); |
| </script> |
| </body> |
| </html> |
