The Tor Browser: content/media/webaudio/test/test_delayNodeTailIncrease.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 increasing delay of DelayNode after input finishes</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 SimpleTest.waitForExplicitFinish();

    15 const signalLength = 100;

    16 const bufferSize = 1024;

    17 // Delay should be long enough to allow CC to run

    18 const delayBufferCount = 50;

    19 const delayLength = delayBufferCount * bufferSize + 700;

    21 var count = 0;

    23 function applySignal(buffer, offset) {

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

    25     buffer.getChannelData(0)[offset + i] = Math.cos(Math.PI * i / signalLength);

    26   }

    27 }

    29 function onAudioProcess(e) {

    30   switch(count) {

    31   case 5:

    32     SpecialPowers.forceGC();

    33     SpecialPowers.forceCC();

    34     break;

    35   case delayBufferCount:

    36     var offset = delayLength - count * bufferSize;

    37     var ctx = e.target.context;

    38     var expected = ctx.createBuffer(1, bufferSize, ctx.sampleRate);

    39     applySignal(expected, offset);

    40     compareBuffers(e.inputBuffer, expected);

    41     SimpleTest.finish();

    42   }

    43   count++;

    44 }

    46 function startTest() {

    47   var ctx = new AudioContext();

    48   var processor = ctx.createScriptProcessor(bufferSize, 1, 0);

    49   processor.onaudioprocess = onAudioProcess;

    51   // Switch on delay at a time in the future.

    52   var delayDuration = delayLength / ctx.sampleRate;

    53   var delayStartTime = (delayLength - bufferSize) / ctx.sampleRate;

    54   var delay = ctx.createDelay(delayDuration);

    55   delay.delayTime.setValueAtTime(delayDuration, delayStartTime);

    56   delay.connect(processor);

    58   // Short signal that finishes before switching to long delay

    59   var buffer = ctx.createBuffer(1, signalLength, ctx.sampleRate);

    60   applySignal(buffer, 0);

    61   var source = ctx.createBufferSource();

    62   source.buffer = buffer;

    63   source.start();

    64   source.connect(delay);

    65 };

    67 startTest();

    68 </script>

    69 </pre>

    70 </body>

    71 </html>

The Tor Browser / file revision