extendable-media-recorder-wav-encoder-worker/build/es2019/functions/shift-channel-data-arrays.js

The worker which is used by the extendable-media-recorder-wav-encoder package.

export const shiftChannelDataArrays = (channelDataArrays, numberOfSamples) => {
  const shiftedChannelDataArrays = [];
  let numberOfShiftedSamples = 0;
  shiftChannelDataArrays: while (numberOfShiftedSamples < numberOfSamples) {
    const length = channelDataArrays.length;
    for (let i = 0; i < length; i += 1) {
      const channelDataArray = channelDataArrays[i];
      if (shiftedChannelDataArrays[i] === void 0) {
        shiftedChannelDataArrays[i] = [];
      }
      const channelData = channelDataArray.shift();
      if (channelData === void 0) {
        break shiftChannelDataArrays;
      }
      shiftedChannelDataArrays[i].push(channelData);
      if (i === 0) {
        numberOfShiftedSamples += channelData.length;
      }
    }
  }
  if (numberOfShiftedSamples > numberOfSamples) {
    const unnecessarySamples = numberOfShiftedSamples - numberOfSamples;
    shiftedChannelDataArrays.forEach((shiftedChannelDataArray, index) => {
      const channelData = shiftedChannelDataArray.pop();
      const offset = channelData.length - unnecessarySamples;
      shiftedChannelDataArray.push(channelData.subarray(0, offset));
      channelDataArrays[index].unshift(channelData.subarray(offset));
    });
  }
  return shiftedChannelDataArrays;
};