test_scriptProcessorNode_playbackTime1.html

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<head>

  <title>Test ScriptProcessorNode playbackTime for bug 970773</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

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

</head>

<body>

<pre id="test">

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

SimpleTest.waitForExplicitFinish();

var context = new AudioContext();

const delay = 0.1;

function doTest() {

  const processorBufferLength = 256;

  // |currentTime| may include double precision floating point

  // rounding errors, so round to nearest integer sample to ignore these.

  var minimumPlaybackSample =

    Math.round(context.currentTime * context.sampleRate) +

    processorBufferLength;

  var sp = context.createScriptProcessor(processorBufferLength);

  sp.connect(context.destination);

  sp.onaudioprocess =

    function(e) {

      is(e.inputBuffer.length, processorBufferLength,

         "expected buffer length");

      var playbackSample = Math.round(e.playbackTime * context.sampleRate)

      ok(playbackSample >= minimumPlaybackSample,

         "playbackSample " + playbackSample +

         " beyond expected minimum " + minimumPlaybackSample);

      sp.onaudioprocess = null;

      SimpleTest.finish();

};

// Wait until AudioDestinationNode has accumulated enough 'extra' time so that

// a failure would be easily detected.

(function waitForExtraTime() {

  if (context.currentTime < delay) {

    SimpleTest.executeSoon(waitForExtraTime);

  } else {

    doTest();

})();

</script>

</pre>

</body>

</html>