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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
| commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
| tree | f435a8308119effd964b339f76abb83a57c29483 /dom/media/webaudio/test/test_audioBufferSourceNodeRate.html | |
| parent | Initial commit. (diff) | |
| download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip | |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/media/webaudio/test/test_audioBufferSourceNodeRate.html')
| -rw-r--r-- | dom/media/webaudio/test/test_audioBufferSourceNodeRate.html | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/dom/media/webaudio/test/test_audioBufferSourceNodeRate.html b/dom/media/webaudio/test/test_audioBufferSourceNodeRate.html new file mode 100644 index 0000000000..60a065c2a9 --- /dev/null +++ b/dom/media/webaudio/test/test_audioBufferSourceNodeRate.html @@ -0,0 +1,58 @@ +<!DOCTYPE HTML> +<html> +<head> + <title>Test AudioBufferSourceNode</title> + <script src="/tests/SimpleTest/SimpleTest.js"></script> + <script type="text/javascript" src="webaudio.js"></script> + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> +</head> +<body> +<pre id="test"> +<script class="testbody" type="text/javascript"> + +SimpleTest.waitForExplicitFinish(); + +var rate = 44100; +var off = new OfflineAudioContext(1, rate, rate); +var off2 = new OfflineAudioContext(1, rate, rate); + +var source = off.createBufferSource(); +var source2 = off2.createBufferSource(); + +// a buffer of a 440Hz at half the length. If we detune by -1200 or set the +// playbackRate to 0.5, we should get 44100 samples back with a sine at 220Hz. +var buf = off.createBuffer(1, rate / 2, rate); +var bufarray = buf.getChannelData(0); +for (var i = 0; i < bufarray.length; i++) { + bufarray[i] = Math.sin(i * 440 * 2 * Math.PI / rate); +} + +source.buffer = buf; +source.playbackRate.value = 0.25; // slowdown to 25% speed +source.connect(off.destination); +source.start(0); + +source2.buffer = buf; +source2.detune.value = -2400; // two octaves -> slowdown to 25% speed +source2.connect(off2.destination); +source2.start(0); + +off.startRendering().then((renderedPlaybackRate) => { + // we don't care about comparing the value here, we just want to know whether + // the second part is noisy. + var rmsValue = rms(renderedPlaybackRate, 0, 22050); + ok(rmsValue != 0, "Resampling happened (rms of the second part " + rmsValue + ")"); + + off2.startRendering().then((renderedDetune) => { + var rmsValue = rms(renderedDetune, 0, 22050); + ok(rmsValue != 0, "Resampling happened (rms of the second part " + rmsValue + ")"); + // The two buffers should be the same: detune of -2400 is a slowdown to 25% speed + compareBuffers(renderedPlaybackRate, renderedDetune); + SimpleTest.finish(); + }); +}); + +</script> +</pre> +</body> +</html>
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