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Diffstat (limited to 'dom/media/webaudio/test/test_bug964376.html')
-rw-r--r-- | dom/media/webaudio/test/test_bug964376.html | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/dom/media/webaudio/test/test_bug964376.html b/dom/media/webaudio/test/test_bug964376.html new file mode 100644 index 0000000000..bc9d167dcd --- /dev/null +++ b/dom/media/webaudio/test/test_bug964376.html @@ -0,0 +1,64 @@ +<!DOCTYPE HTML> +<html> +<head> + <title>Test repeating audio is not distorted</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"> + +function gcd(a, b) { + if (b === 0) { + return a; + } + return gcd(b, a % b); +} + +var SAMPLE_PLACEMENT = 128; + +var gTest = { + length: 2048, + numberOfChannels: 1, + + createGraph(context) { + var freq = Math.round(context.sampleRate / SAMPLE_PLACEMENT); + var dur = context.sampleRate / gcd(freq, context.sampleRate); + var buffer = context.createBuffer(1, dur, context.sampleRate); + + for (var i = 0; i < context.sampleRate; ++i) { + buffer.getChannelData(0)[i] = Math.sin(freq * 2 * Math.PI * i / context.sampleRate); + } + + var source = context.createBufferSource(); + source.buffer = buffer; + source.loop = true; + source.playbackRate.setValueAtTime(0.5, SAMPLE_PLACEMENT / context.sampleRate); + source.start(0); + + return source; + }, + + createExpectedBuffers(context) { + var freq = Math.round(context.sampleRate / SAMPLE_PLACEMENT); + var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate); + var c = expectedBuffer.getChannelData(0); + for (var i = 0; i < c.length; ++i) { + if (i < SAMPLE_PLACEMENT) { + c[i] = Math.sin(freq * 2 * Math.PI * i / context.sampleRate); + } else { + c[i] = Math.sin(freq / 2 * 2 * Math.PI * (i + SAMPLE_PLACEMENT) / context.sampleRate); + } + } + + return expectedBuffer; + }, +}; + +runTest(); +</script> +</pre> +</body> +</html> |