The Tor Browser: content/media/webaudio/test/test_oscillatorNode2.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 OscillatorNode lifetime and sine phase</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;

    15 function createOscillator(context) {

    16   var osc = context.createOscillator();

    17   osc.start(0);

    18   osc.stop(signalLength/context.sampleRate);

    19   return osc;

    20 }

    22 function connectUnreferencedOscillator(context, destination) {

    23   var osc = createOscillator(context);

    24   osc.connect(destination);

    25 }

    27 var gTest = {

    28   length: signalLength,

    29   numberOfChannels: 1,

    30   createGraph: function(context) {

    31     var blend = context.createGain();

    33     connectUnreferencedOscillator(context, blend);

    34     // Test that the unreferenced oscillator remains alive until it has finished.

    35     SpecialPowers.forceGC();

    36     SpecialPowers.forceCC();

    38     // Create another sine wave oscillator in negative time, which should

    39     // cancel when mixed with the unreferenced oscillator.

    40     var oscillator = createOscillator(context);

    41     oscillator.frequency.value = -440;

    42     oscillator.connect(blend);

    44     return blend;

    45   },

    46 };

    48 runTest();

    50 </script>

    51 </pre>

    52 </body>

    53 </html>

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