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periodicWave.html (5031B)

      1 <!DOCTYPE html>
      2 <html>
      3  <head>
      4    <title>
      5      Test Constructor: PeriodicWave
      6    </title>
      7    <script src="/resources/testharness.js"></script>
      8    <script src="/resources/testharnessreport.js"></script>
      9    <script src="/webaudio/resources/audit-util.js"></script>
     10    <script src="/webaudio/resources/audit.js"></script>
     11  </head>
     12  <body>
     13    <script id="layout-test-code">
     14      // real and imag are used in separate PeriodicWaves to make their peak values
     15      // easy to determine.
     16      const realMax = 99;
     17      var real = new Float32Array(realMax + 1);
     18      real[1] = 2.0; // fundamental
     19      real[realMax] = 3.0;
     20      const realPeak = real[1] + real[realMax];
     21      const realFundamental = 19.0;
     22      var imag = new Float32Array(4);
     23      imag[0] = 6.0; // should be ignored.
     24      imag[3] = 0.5;
     25      const imagPeak = imag[3];
     26      const imagFundamental = 551.0;
     27 
     28      const testLength = 8192;
     29      let context = new AudioContext();
     30 
     31      let audit = Audit.createTaskRunner();
     32 
     33      // Create with the factory method
     34 
     35      audit.define('create with factory method', (task, should) => {
     36        should(() => {
     37          context.createPeriodicWave(new Float32Array(testLength), new Float32Array(testLength));
     38        }, 'context.createPeriodicWave(new Float32Array(' + testLength + '), ' +
     39        'new Float32Array(' + testLength + '))').notThrow();
     40        task.done();
     41      });
     42 
     43      audit.define('different length with factory method', (task, should) => {
     44        should(() => {
     45          context.createPeriodicWave(new Float32Array(512), new Float32Array(4));
     46        }, 'context.createPeriodicWave(new Float32Array(512), ' +
     47        'new Float32Array(4))').throw(DOMException, "IndexSizeError");
     48        task.done();
     49      });
     50 
     51      audit.define('too small with factory method', (task, should) => {
     52        should(() => {
     53          context.createPeriodicWave(new Float32Array(1), new Float32Array(1));
     54        }, 'context.createPeriodicWave(new Float32Array(1), ' +
     55        'new Float32Array(1))').throw(DOMException, "IndexSizeError");
     56        task.done();
     57      });
     58 
     59      // Create with the constructor
     60 
     61      audit.define('create with constructor', (task, should) => {
     62        should(() => {
     63          new PeriodicWave(context, { real: new Float32Array(testLength), imag: new Float32Array(testLength) });
     64        }, 'new PeriodicWave(context, { real : new Float32Array(' + testLength + '), ' +
     65        'imag : new Float32Array(' + testLength + ') })').notThrow();
     66        task.done();
     67      });
     68 
     69      audit.define('different length with constructor', (task, should) => {
     70        should(() => {
     71          new PeriodicWave(context, { real: new Float32Array(testLength), imag: new Float32Array(4) });
     72        }, 'new PeriodicWave(context, { real : new Float32Array(' + testLength + '), ' +
     73        'imag : new Float32Array(4) })').throw(DOMException, "IndexSizeError");
     74        task.done();
     75      });
     76 
     77      audit.define('too small with constructor', (task, should) => {
     78        should(() => {
     79          new PeriodicWave(context, { real: new Float32Array(1), imag: new Float32Array(1) });
     80        }, 'new PeriodicWave(context, { real : new Float32Array(1), ' +
     81        'imag : new Float32Array(1) })').throw(DOMException, "IndexSizeError");
     82        task.done();
     83      });
     84 
     85      audit.define('output test', (task, should) => {
     86        let context = new OfflineAudioContext(2, testLength, 44100);
     87        // Create the expected output buffer
     88        let expectations = context.createBuffer(2, testLength, context.sampleRate);
     89        for (var i = 0; i < expectations.length; ++i) {
     90 
     91          expectations.getChannelData(0)[i] = 1.0 / realPeak *
     92            (real[1] * Math.cos(2 * Math.PI * realFundamental * i /
     93                                context.sampleRate) +
     94             real[realMax] * Math.cos(2 * Math.PI * realMax * realFundamental * i /
     95                                context.sampleRate));
     96 
     97          expectations.getChannelData(1)[i] = 1.0 / imagPeak *
     98             imag[3] * Math.sin(2 * Math.PI * 3 * imagFundamental * i /
     99                                context.sampleRate);
    100        }
    101 
    102        // Create the real output buffer
    103        let merger = context.createChannelMerger();
    104 
    105        let osc1 = context.createOscillator();
    106        let osc2 = context.createOscillator();
    107 
    108        osc1.setPeriodicWave(context.createPeriodicWave(
    109                                real, new Float32Array(real.length)));
    110        osc2.setPeriodicWave(context.createPeriodicWave(
    111                                new Float32Array(imag.length), imag));
    112        osc1.frequency.value = realFundamental;
    113        osc2.frequency.value = imagFundamental;
    114 
    115        osc1.start();
    116        osc2.start();
    117 
    118        osc1.connect(merger, 0, 0);
    119        osc2.connect(merger, 0, 1);
    120 
    121        context.startRendering().then(reality => {
    122          should(reality, 'rendering PeriodicWave').beEqualToArray(expectations);
    123          task.done();
    124        });
    125      });
    126 
    127      audit.run();
    128    </script>
    129  </body>
    130 </html>