| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| audiobuffersource-playbackrate-modulation.html |
| </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/audiobuffersource-testing.js"></script> |
| <script src="../resources/buffer-loader.js"></script> |
| <script src="../resources/audio-file-utils.js"></script> |
| </head> |
| <body> |
| <script id="layout-test-code"> |
| let sampleRate = 44100; |
| let duration = 0.25; |
| |
| let context = |
| new OfflineAudioContext(1, sampleRate * duration, sampleRate); |
| let referenceBuffer; |
| |
| let audit = Audit.createTaskRunner(); |
| |
| // Task: Load the reference file asynchronously. In order to create a new |
| // reference file, use the task 'generate-reference' below. |
| audit.define('load-reference', (task, should) => { |
| let loader = new BufferLoader( |
| context, ['resources/audiobuffersource-playbackrate-modulation-expected.wav'], |
| function(bufferList) { |
| referenceBuffer = bufferList[0]; |
| should(true, 'Loaded reference file').beTrue(); |
| task.done(); |
| }); |
| |
| loader.load(); |
| }); |
| |
| |
| // Task: Render the actual buffer and compare with the reference. |
| audit.define('generate-verify', (task, should) => { |
| |
| // With this setting, the playback rate will be changing continuously |
| // and repeatedly within the range of [0, 200] around 100Hz, based on |
| // the input from the oscillator. |
| createSawtoothWithModulation(context, 'playbackRate', 100, 100); |
| |
| context.startRendering() |
| .then(function(renderedBuffer) { |
| let actual = renderedBuffer.getChannelData(0); |
| let expected = referenceBuffer.getChannelData(0); |
| |
| // Compare two buffers with arbitrary (yet reasonable) |
| // constraints. There parameters are determined by try bot |
| // experiments. |
| compareBuffersWithConstraints(should, actual, expected, { |
| prefix: 'Verify', |
| thresholdSNR: 93.274, |
| thresholdDiffULP: 1.0519, |
| thresholdDiffCount: 0, |
| bitDepth: 16 |
| }); |
| |
| let filename = |
| 'resources/audiobuffersource-playbackrate-modulation-actual.wav'; |
| if (downloadAudioBuffer(renderedBuffer, filename)) |
| should(true, 'Saved reference file').message(filename, ''); |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
