The Tor Browser: content/media/webaudio/test/test_dynamicsCompressorNode.html@b8a032363ba2

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

     1 <!DOCTYPE HTML>

     2 <html>

     3 <head>

     4   <title>Test DynamicsCompressorNode</title>

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

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

     7 </head>

     8 <body>

     9 <pre id="test">

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

    12 function near(a, b, msg) {

    13   ok(Math.abs(a - b) < 1e-4, msg);

    14 }

    16 SimpleTest.waitForExplicitFinish();

    17 addLoadEvent(function() {

    18   var context = new AudioContext();

    19   var buffer = context.createBuffer(1, 2048, context.sampleRate);

    20   for (var i = 0; i < 2048; ++i) {

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

    22   }

    24   var destination = context.destination;

    26   var source = context.createBufferSource();

    28   var compressor = context.createDynamicsCompressor();

    30   source.buffer = buffer;

    32   source.connect(compressor);

    33   compressor.connect(destination);

    35   is(compressor.channelCount, 2, "compressor node has 2 input channels by default");

    36   is(compressor.channelCountMode, "explicit", "Correct channelCountMode for the compressor node");

    37   is(compressor.channelInterpretation, "speakers", "Correct channelCountInterpretation for the compressor node");

    39   // Verify default values

    40   with (compressor) {

    41     near(threshold.defaultValue, -24, "Correct default value for threshold");

    42     near(knee.defaultValue, 30, "Correct default value for knee");

    43     near(ratio.defaultValue, 12, "Correct default value for ratio");

    44     near(reduction.defaultValue, 0, "Correct default value for reduction");

    45     near(attack.defaultValue, 0.003, "Correct default value for attack");

    46     near(release.defaultValue, 0.25, "Correct default value for release");

    47   }

    49   source.start(0);

    50   SimpleTest.executeSoon(function() {

    51     source.stop(0);

    52     source.disconnect();

    53     compressor.disconnect();

    55     SimpleTest.finish();

    56   });

    57 });

    59 </script>

    60 </pre>

    61 </body>

    62 </html>

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