The Tor Browser: content/media/webaudio/test/test_audioBufferSourceNodeOffset.html@44a2da4a2ab2

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

     1 <!DOCTYPE HTML>

     2 <html>

     3 <head>

     4   <title>Test the offset property on AudioBufferSourceNode</title>

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

     6   <script type="text/javascript" src="webaudio.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">

    13 var fuzz = 0.3;

    15 if (navigator.platform.startsWith("Mac")) {

    16   // bug 895720

    17   fuzz = 0.6;

    18 }

    20 SimpleTest.waitForExplicitFinish();

    21 addLoadEvent(function() {

    22   var samplesFromSource = 0;

    23   var context = new AudioContext();

    24   var sp = context.createScriptProcessor(256);

    26   sp.onaudioprocess = function(e) {

    27     samplesFromSource += e.inputBuffer.length;

    28   }

    30   var buffer = context.createBuffer(1, context.sampleRate, context.sampleRate);

    31   for (var i = 0; i < context.sampleRate; ++i) {

    32     buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);

    33   }

    35   var source = context.createBufferSource();

    37   source.onended = function(e) {

    38     // The timing at which the audioprocess and ended listeners are called can

    39     // change, hence the fuzzy equal here.

    40     var errorRatio = samplesFromSource / (0.5 * context.sampleRate);

    41     ok(errorRatio > (1.0 - fuzz) && errorRatio < (1.0 + fuzz),

    42        "Correct number of samples received (expected: " +

    43        (0.5 * context.sampleRate) + ", actual: " + samplesFromSource + ").");

    44     SimpleTest.finish();

    45   };

    47   source.buffer = buffer;

    48   source.connect(sp);

    49   source.start(0, 0.5);

    50 });

    52 </script>

    53 </pre>

    54 </body>

    55 </html>

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