merger-testing.js - mozsearch

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// This file is for the audiochannelmerger-* layout tests.

// Requires |audio-testing.js| to work properly.

function testMergerInput(should, config) {

  let context = new OfflineAudioContext(config.numberOfChannels, 128, 44100);

  let merger = context.createChannelMerger(config.numberOfChannels);

  let source = context.createBufferSource();

  source.buffer = createConstantBuffer(context, 128, config.testBufferContent);

  // Connect the output of source into the specified input of merger.

  if (config.mergerInputIndex)

    source.connect(merger, 0, config.mergerInputIndex);

  else

    source.connect(merger);

  merger.connect(context.destination);

  source.start();

  return context.startRendering().then(function(buffer) {

    let prefix = config.testBufferContent.length + '-channel source: ';

    for (let i = 0; i < config.numberOfChannels; i++)

      should(buffer.getChannelData(i), prefix + 'Channel #' + i)

          .beConstantValueOf(config.expected[i]);

});