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<!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 type="text/javascript" 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>
|
