The Tor Browser: content/media/webaudio/test/test_delayNodeTailWithDisconnect.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 tail time lifetime of DelayNode after input is disconnected</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 // Web Audio doesn't provide a means to precisely time disconnect()s but we

    14 // can test that the output of delay nodes matches the output from their

    15 // sources before they are disconnected.

    17 SimpleTest.waitForExplicitFinish();

    19 const signalLength = 128;

    20 const bufferSize = 4096;

    21 const sourceCount = bufferSize / signalLength;

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

    23 var delayBufferCount = 20;

    24 const delayLength = delayBufferCount * bufferSize;

    26 var sourceOutput = new Float32Array(bufferSize);

    27 var delayOutputCount = 0;

    28 var sources = [];

    30 function onDelayOutput(e) {

    31   if (delayOutputCount < delayBufferCount) {

    32     delayOutputCount++;

    33     return;

    34   }

    36   compareChannels(e.inputBuffer.getChannelData(0), sourceOutput);

    37   e.target.onaudioprocess = null;

    38   SimpleTest.finish();

    39 }

    41 function onSourceOutput(e) {

    42   // Record the first buffer

    43   e.inputBuffer.copyFromChannel(sourceOutput, 0);

    44   e.target.onaudioprocess = null;

    45 }

    47 function disconnectSources() {

    48   for (var i = 0; i < sourceCount; ++i) {

    49     sources[i].disconnect();

    50   }

    52   SpecialPowers.forceGC();

    53   SpecialPowers.forceCC();

    54 }

    56 function startTest() {

    57   var ctx = new AudioContext();

    59   var sourceProcessor = ctx.createScriptProcessor(bufferSize, 1, 0);

    60   sourceProcessor.onaudioprocess = onSourceOutput;

    61   // Keep audioprocess events going after source disconnect.

    62   sourceProcessor.connect(ctx.destination);

    64   var delayProcessor = ctx.createScriptProcessor(bufferSize, 1, 0);

    65   delayProcessor.onaudioprocess = onDelayOutput;

    66   // Work around bug 916387.

    67   delayProcessor.connect(ctx.destination);

    69   var delayDuration = delayLength / ctx.sampleRate;

    70   for (var i = 0; i < sourceCount; ++i) {

    71     var delay = ctx.createDelay(delayDuration);

    72     delay.delayTime.value = delayDuration;

    73     delay.connect(delayProcessor);

    75     var source = ctx.createOscillator();

    76     source.frequency.value = 440 + 10 * i

    77     source.start(i * signalLength / ctx.sampleRate);

    78     source.stop((i + 1) * signalLength / ctx.sampleRate);

    79     source.connect(delay);

    80     source.connect(sourceProcessor);

    82     sources[i] = source;

    83   }

    85   // Assuming the above Web Audio operations have already scheduled an event

    86   // to run in stable state and start the graph thread, schedule a subsequent

    87   // event to disconnect the sources, which will remove main thread connection

    88   // references before it knows the graph thread has started using the source

    89   // streams.

    90   SimpleTest.executeSoon(disconnectSources);

    91 };

    93 startTest();

    94 </script>

    95 </pre>

    96 </body>

    97 </html>

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