The Tor Browser: content/media/webaudio/test/test

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 <!DOCTYPE HTML>

     2 <html>

     3 <meta charset=utf-8>

     4 <head>

     5   <title>Test that we decode uint8 and sint16 wave files with correct conversion to float64</title>

     6   <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>

     7   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

     8 </head>

     9 <body>

    10 <pre id="test">

    11 <script class="testbody" type="text/javascript">

    12 var testsDone = 0;

    13 var tests = ["UklGRjUrAABXQVZFZm10IBAAAAABAAEAESsAABErAAABAAgAZGF0YQMAAAD/AIA=",

    14              "UklGRkZWAABXQVZFZm10IBAAAAABAAEAESsAACJWAAACABAAZGF0YQYAAAD/fwCAAAA="];

    16 SimpleTest.waitForExplicitFinish();

    18 function base64ToUint8Buffer(b64) {

    19   var str = atob(b64)

    20   var u8 = new Uint8Array(str.length);

    21   for (var i = 0; i < str.length; ++i) {

    22     u8[i] = str.charCodeAt(i);

    23   }

    24   return u8;

    25 }

    27 function fixupBufferSampleRate(u8, rate) {

    28   u8[24] = (rate & 0x000000ff) >> 0;

    29   u8[25] = (rate & 0x0000ff00) >> 8;

    30   u8[26] = (rate & 0x00ff0000) >> 16;

    31   u8[27] = (rate & 0xff000000) >> 24;

    32 }

    34 function finishTest() {

    35   testsDone += 1;

    36   if (testsDone == tests.length) {

    37     SimpleTest.finish();

    38   }

    39 }

    41 function decodeComplete(b) {

    42   ok(true, "Decoding succeeded.");

    43   is(b.numberOfChannels, 1, "Should have 1 channel.");

    44   is(b.length, 3, "Should have three samples.");

    45   var samples = b.getChannelData(0);

    46   ok(samples[0] >  0.99 && samples[0] <  1.01, "Check near  1.0. Got " + samples[0]);

    47   ok(samples[1] > -1.01 && samples[1] < -0.99, "Check near -1.0. Got " + samples[1]);

    48   ok(samples[2] > -0.01 && samples[2] <  0.01, "Check near  0.0. Got " + samples[2]);

    49   finishTest();

    50 }

    52 function decodeFailed() {

    53   ok(false, "Decoding failed.");

    54   finishTest();

    55 }

    57 addLoadEvent(function() {

    58   var context = new AudioContext();

    60   for (var i = 0; i < tests.length; ++i) {

    61     var u8 = base64ToUint8Buffer(tests[i]);

    62     fixupBufferSampleRate(u8, context.sampleRate);

    63     context.decodeAudioData(u8.buffer, decodeComplete, decodeFailed);

    64   }

    65 });

    66 </script>

    67 </pre>

    68 </body>

    69 </html>

The Tor Browser / file revision