The Tor Browser: content/media/webaudio/test/test_convolverNodeWithGain.html@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 <!DOCTYPE HTML>

     2 <html>

     3 <head>

     4   <title>Test ConvolverNode after a GainNode - Bug 891254 </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 src="webaudio.js" type="text/javascript"></script>

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

    13 const signalLength = 2048;

    14 const responseLength = 100;

    15 const outputLength = 4096; // > signalLength + responseLength

    17 var gTest = {

    18   length: outputLength,

    19   numberOfChannels: 1,

    20   createGraph: function(context) {

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

    22     for (var i = 0; i < signalLength; ++i) {

    23       buffer.getChannelData(0)[i] = Math.sin(2 * Math.PI * i / signalLength);

    24     }

    26     var source = context.createBufferSource();

    27     source.buffer = buffer;

    28     source.start(0);

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

    31     for (var i = 0; i < responseLength; ++i) {

    32       response.getChannelData(0)[i] = i / responseLength;

    33     }

    35     var gain = context.createGain();

    36     gain.gain.value = -1;

    37     source.connect(gain);

    39     var convolver1 = context.createConvolver();

    40     convolver1.buffer = response;

    41     gain.connect(convolver1);

    43     var convolver2 = context.createConvolver();

    44     convolver2.buffer = response;

    45     source.connect(convolver2);

    47     // The output of convolver1 should be the inverse of convolver2, so blend

    48     // them together and expect silence.

    49     var blend = context.createGain();

    50     convolver1.connect(blend);

    51     convolver2.connect(blend);

    53     return blend;

    54   },

    55 };

    57 runTest();

    59 </script>

    60 </pre>

    61 </body>

    62 </html>

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