Quelle test_waveDecoder.html Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/dom/media/webaudio/test/test_waveDecoder.html

<!DOCTYPE HTML>
<html>
<meta charset=utf-8>
<head>
  <title>Test that we decode uint8 and sint16 wave files with correct conversion to float64</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<pre id="test">
<script class="testbody" type="text/javascript">
var testsDone = 0;
var tests = ["UklGRjUrAABXQVZFZm10IBAAAAABAAEAESsAABErAAABAAgAZGF0YQMAAAD/AIA=",
             "UklGRkZWAABXQVZFZm10IBAAAAABAAEAESsAACJWAAACABAAZGF0YQYAAAD/fwCAAAA="];

SimpleTest.waitForExplicitFinish();

function base64ToUint8Buffer(b64) {
  var str = atob(b64)
  var u8 = new Uint8Array(str.length);
  for (var i = 0; i < str.length; ++i) {
    u8[i] = str.charCodeAt(i);
  }
  return u8;
}

function fixupBufferSampleRate(u8, rate) {
  u8[24] = (rate & 0x000000ff) >> 0;
  u8[25] = (rate & 0x0000ff00) >> 8;
  u8[26] = (rate & 0x00ff0000) >> 16;
  u8[27] = (rate & 0xff000000) >> 24;
}

function finishTest() {
  testsDone += 1;
  if (testsDone == tests.length) {
    SimpleTest.finish();
  }
}

function decodeComplete(b) {
  ok(true, "Decoding succeeded.");
  is(b.numberOfChannels, 1, "Should have 1 channel.");
  is(b.length, 3, "Should have three samples.");
  var samples = b.getChannelData(0);
  ok(samples[0] >  0.99 && samples[0] <  1.01, "Check near 1.0. Got " + samples[0]);
  ok(samples[1] > -1.01 && samples[1] < -0.99, "Check near -1.0. Got " + samples[1]);
  ok(samples[2] > -0.01 && samples[2] <  0.01, "Check near 0.0. Got " + samples[2]);
  finishTest();
}

function decodeFailed() {
  ok(false, "Decoding failed.");
  finishTest();
}

addLoadEvent(function() {
  var context = new AudioContext();

  for (var i = 0; i < tests.length; ++i) {
    var u8 = base64ToUint8Buffer(tests[i]);
    fixupBufferSampleRate(u8, context.sampleRate);
    context.decodeAudioData(u8.buffer, decodeComplete, decodeFailed);
  }
});
</script>
</pre>
</body>
</html>

Messung V0.5

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