Quelle test_periodicWave.html Sprache: HTML

products/sources/formale Sprachen/C/Firefox/dom/media/webaudio/test/test_periodicWave.html

<!DOCTYPE HTML>
<html>
<head>
  <title>Test the PeriodicWave interface</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="text/javascript" src="webaudio.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();

// real and imag are used in separate PeriodicWaves to make their peak values
// easy to determine.
const realMax = 99;
var real = new Float32Array(realMax + 1);
real[1] = 2.0; // fundamental
real[realMax] = 3.0;
const realPeak = real[1] + real[realMax];
const realFundamental = 19.0;
var imag = new Float32Array(4);
imag[0] = 6.0; // should be ignored.
imag[3] = 0.5;
const imagPeak = imag[3];
const imagFundamental = 551.0;

const testLength = 4096;

addLoadEvent(function() {
  var ac = new AudioContext();
  ac.createPeriodicWave(new Float32Array(4096), new Float32Array(4096));
  expectException(function() {
    ac.createPeriodicWave(new Float32Array(512), imag);
  }, DOMException.INDEX_SIZE_ERR);
  expectException(function() {
    ac.createPeriodicWave(new Float32Array(0), new Float32Array(0));
  }, DOMException.INDEX_SIZE_ERR);
  expectException(function() {
    ac.createPeriodicWave(new Float32Array(1), new Float32Array(1));
  }, DOMException.INDEX_SIZE_ERR);
  expectNoException(function() {
    ac.createPeriodicWave(new Float32Array(4097), new Float32Array(4097));
  });

  expectNoException(function() {
    new PeriodicWave(ac, {});
  });

  // real.size == imag.size
  expectException(function() {
    new PeriodicWave(ac, {real: new Float32Array(10), imag: new Float32Array(9)});
  }, DOMException.INDEX_SIZE_ERR);

  // size lower than 2 is not allowed
  expectException(function() {
    new PeriodicWave(ac, {real: new Float32Array(0)});
  }, DOMException.INDEX_SIZE_ERR);
  expectException(function() {
    new PeriodicWave(ac, {imag: new Float32Array(0)});
  }, DOMException.INDEX_SIZE_ERR);
  expectException(function() {
    new PeriodicWave(ac, {real: new Float32Array(1)});
  }, DOMException.INDEX_SIZE_ERR);
  expectException(function() {
    new PeriodicWave(ac, {imag: new Float32Array(1)});
  }, DOMException.INDEX_SIZE_ERR);
  expectException(function() {
    new PeriodicWave(ac, {real: new Float32Array(0), imag: new Float32Array(0)});
  }, DOMException.INDEX_SIZE_ERR);
  expectException(function() {
    new PeriodicWave(ac, {real: new Float32Array(1), imag: new Float32Array(1)});
  }, DOMException.INDEX_SIZE_ERR);

  new PeriodicWave(ac, {real: new Float32Array(4096), imag: new Float32Array(4096)});
  new PeriodicWave(ac, {real: new Float32Array(4096) });
  new PeriodicWave(ac, {imag: new Float32Array(4096) });

  runTest();
});

var gTest = {
  createGraph(context) {
    var merger = context.createChannelMerger();

    var osc0 = context.createOscillator();
    var osc1 = context.createOscillator();

    osc0.setPeriodicWave(context.
                         createPeriodicWave(real,
                                            new Float32Array(real.length)));
    osc1.setPeriodicWave(context.
                         createPeriodicWave(new Float32Array(imag.length),
                                            imag));

    osc0.frequency.value = realFundamental;
    osc1.frequency.value = imagFundamental;

    osc0.start();
    osc1.start();

    osc0.connect(merger, 0, 0);
    osc1.connect(merger, 0, 1);

    return merger;
  },
  createExpectedBuffers(context) {
    var buffer = context.createBuffer(2, testLength, context.sampleRate);

    for (var i = 0; i < buffer.length; ++i) {

      buffer.getChannelData(0)[i] = 1.0 / realPeak *
        (real[1] * Math.cos(2 * Math.PI * realFundamental * i /
                            context.sampleRate) +
         real[realMax] * Math.cos(2 * Math.PI * realMax * realFundamental * i /
                            context.sampleRate));

      buffer.getChannelData(1)[i] = 1.0 / imagPeak *
         imag[3] * Math.sin(2 * Math.PI * 3 * imagFundamental * i /
                            context.sampleRate);
    }
    return buffer;
  },
};

</script>
</pre>
</body>
</html>

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