| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| Test WaveShaper Copies Curve Data |
| </title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="../../resources/audit-util.js"></script> |
| <script src="../../resources/audit.js"></script> |
| </head> |
| <body> |
| <script id="layout-test-code"> |
| // Sample rate and number of frames are fairly arbitrary. We need to |
| // render, however, at least 384 frames. 1024 is a nice small value. |
| let sampleRate = 16000; |
| let renderFrames = 1024; |
| |
| let audit = Audit.createTaskRunner(); |
| |
| audit.define( |
| { |
| label: 'test copying', |
| description: 'Modifying curve should not modify WaveShaper' |
| }, |
| (task, should) => { |
| // Two-channel context; channel 0 contains the test data and channel |
| // 1 contains the expected result. Channel 1 has the normal |
| // WaveShaper output and channel 0 has the WaveShaper output with a |
| // modified curve. |
| let context = new OfflineAudioContext(2, renderFrames, sampleRate); |
| |
| // Just use a default oscillator as the source. Doesn't really |
| // matter what we use. |
| let src = context.createOscillator(); |
| src.type = 'sawtooth'; |
| |
| // Create the wave shapers: ws0 is the test shaper, and ws1 is the |
| // reference wave shaper. |
| let ws0 = context.createWaveShaper(); |
| let ws1 = context.createWaveShaper(); |
| |
| // Wave shaper curves. Doesn't really matter what we use as long as |
| // it modifies the input in some way. Thus, keep it simple and just |
| // invert the input. |
| let desiredCurve = [1, 0, -1]; |
| let curve0 = Float32Array.from(desiredCurve); |
| let curve1 = Float32Array.from(desiredCurve); |
| |
| ws0.curve = curve0; |
| ws1.curve = curve1; |
| |
| let merger = context.createChannelMerger(2); |
| |
| // Connect the graph |
| src.connect(ws0); |
| src.connect(ws1); |
| |
| ws0.connect(merger, 0, 0); |
| ws1.connect(merger, 0, 1); |
| |
| merger.connect(context.destination); |
| |
| // Let the context run for a bit and then modify the curve for ws0. |
| // Doesn't really matter what we modify the curve to as long as it's |
| // different. |
| context.suspend(256 / context.sampleRate) |
| .then(() => { |
| should( |
| () => { |
| curve0[0] = -0.5; |
| curve0[1] = 0.125; |
| curve0[2] = 0.75; |
| }, |
| `Modifying curve array at time ${context.currentTime}`) |
| .notThrow(); |
| }) |
| .then(context.resume.bind(context)); |
| |
| src.start(); |
| |
| context.startRendering() |
| .then(function(renderedBuffer) { |
| let actual = renderedBuffer.getChannelData(0); |
| let expected = renderedBuffer.getChannelData(1); |
| |
| // Modifying the wave shaper curve should not modify the |
| // output so the outputs from the two wave shaper nodes should |
| // be exactly identical. |
| should(actual, 'Output of WaveShaper with modified curve') |
| .beEqualToArray(expected); |
| |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
