зеркало из https://github.com/mozilla/gecko-dev.git
70 строки
1.9 KiB
HTML
70 строки
1.9 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<meta charset=utf-8>
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<head>
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<title>Test that we decode uint8 and sint16 wave files with correct conversion to float64</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<pre id="test">
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<script class="testbody" type="text/javascript">
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var testsDone = 0;
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var tests = ["UklGRjUrAABXQVZFZm10IBAAAAABAAEAESsAABErAAABAAgAZGF0YQMAAAD/AIA=",
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"UklGRkZWAABXQVZFZm10IBAAAAABAAEAESsAACJWAAACABAAZGF0YQYAAAD/fwCAAAA="];
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SimpleTest.waitForExplicitFinish();
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function base64ToUint8Buffer(b64) {
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var str = atob(b64)
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var u8 = new Uint8Array(str.length);
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for (var i = 0; i < str.length; ++i) {
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u8[i] = str.charCodeAt(i);
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}
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return u8;
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}
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function fixupBufferSampleRate(u8, rate) {
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u8[24] = (rate & 0x000000ff) >> 0;
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u8[25] = (rate & 0x0000ff00) >> 8;
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u8[26] = (rate & 0x00ff0000) >> 16;
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u8[27] = (rate & 0xff000000) >> 24;
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}
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function finishTest() {
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testsDone += 1;
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if (testsDone == tests.length) {
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SimpleTest.finish();
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}
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}
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function decodeComplete(b) {
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ok(true, "Decoding succeeded.");
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is(b.numberOfChannels, 1, "Should have 1 channel.");
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is(b.length, 3, "Should have three samples.");
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var samples = b.getChannelData(0);
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ok(samples[0] > 0.99 && samples[0] < 1.01, "Check near 1.0. Got " + samples[0]);
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ok(samples[1] > -1.01 && samples[1] < -0.99, "Check near -1.0. Got " + samples[1]);
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ok(samples[2] > -0.01 && samples[2] < 0.01, "Check near 0.0. Got " + samples[2]);
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finishTest();
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}
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function decodeFailed() {
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ok(false, "Decoding failed.");
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finishTest();
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}
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addLoadEvent(function() {
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var context = new AudioContext();
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for (var i = 0; i < tests.length; ++i) {
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var u8 = base64ToUint8Buffer(tests[i]);
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fixupBufferSampleRate(u8, context.sampleRate);
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context.decodeAudioData(u8.buffer, decodeComplete, decodeFailed);
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}
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});
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</script>
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</pre>
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</body>
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</html>
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