third_party/WebKit/LayoutTests/webaudio/resources/merger-testing.js

   1 // This file is for the audiochannelmerger-* layout tests.
   2 // Requires |audio-testing.js| to work properly.
   3
   4 function testMergerInput(config, done) {
   5   var context = new OfflineAudioContext(config.numberOfChannels, 128, 44100);
   6   var merger = context.createChannelMerger(config.numberOfChannels);
   7   var source = context.createBufferSource();
   8
   9   // Create a test source buffer.
  10   source.buffer = createTestingAudioBuffer(
  11     context, config.testBufferChannelCount, 128
  12   );
  13
  14   // Connect the output of source into the specified input of merger.
  15   if (config.mergerInputIndex)
  16     source.connect(merger, 0, config.mergerInputIndex);
  17   else
  18     source.connect(merger);
  19   merger.connect(context.destination);
  20   source.start();
  21
  22   context.startRendering().then(function (buffer) {
  23     for (var i = 0; i < config.numberOfChannels; i++)
  24       Should('Channel #' + i, buffer.getChannelData(i))
  25         .beConstantValueOf(config.expected[i]);
  26     done();
  27   });
  28 }