blob: 3ea2daa7507158b41a496e02b8ed90f0f0003787 [file] [log] [blame]
<!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>