| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| Test setValueCurveAtTime with Huge Duration |
| </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/audioparam-testing.js"></script> |
| </head> |
| <body> |
| <script id="layout-test-code"> |
| let sampleRate = 48000; |
| let renderFrames = 1000; |
| |
| let audit = Audit.createTaskRunner(); |
| |
| audit.define('long duration', (task, should) => { |
| // We only need to generate a small number of frames for this test. |
| let context = new OfflineAudioContext(1, renderFrames, sampleRate); |
| let src = context.createBufferSource(); |
| |
| // Constant source of amplitude 1, looping. |
| src.buffer = createConstantBuffer(context, 1, 1); |
| src.loop = true; |
| |
| // Automate the gain with a setValueCurve with a very long duration. |
| // The duration should produce a frame number greater than 2^64 (larger |
| // than the largest size_t value). |
| let gain = context.createGain(); |
| let duration = Math.pow(2, 64); |
| let curve = Float32Array.from([0, 1]); |
| gain.gain.setValueCurveAtTime(curve, 0, duration); |
| |
| // Create the graph and go! |
| src.connect(gain); |
| gain.connect(context.destination); |
| src.start(); |
| |
| context.startRendering() |
| .then(function(result) { |
| // Find the maximum value of the buffer. |
| let max = Math.max.apply(null, result.getChannelData(0)); |
| |
| // The automation does linear interpolation between 0 and 1 from |
| // time 0 to duration. Hence the max value of the interpolation |
| // occurs at the end of the rendering. Compute this value. |
| |
| let expectedMax = (renderFrames / sampleRate) * (1 / duration); |
| |
| let message = |
| 'setValueCurve([' + curve + '], 0, ' + duration + ')'; |
| |
| should(max, 'Max amplitude of ' + message) |
| .beLessThanOrEqualTo(expectedMax); |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
