text: /*
   * Copyright (c) 2017-2019 Rafael da Silva Rocha.
   *
   * Permission is hereby granted, free of charge, to any person obtaining
   * a copy of this software and associated documentation files (the
   * "Software"), to deal in the Software without restriction, including
   * without limitation the rights to use, copy, modify, merge, publish,
   * distribute, sublicense, and/or sell copies of the Software, and to
   * permit persons to whom the Software is furnished to do so, subject to
   * the following conditions:
   *
   * The above copyright notice and this permission notice shall be
   * included in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
   * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   */
  
  /**
   * @fileoverview The interleave function.
   * @see https://github.com/rochars/wavefile
   */
  
  /**
   * Interleave de-interleaved samples.
   * @param {!(Array|TypedArray)} samples The samples.
   * @return {!(Array|TypedArray)}
   */
  export function interleave(samples) {
    /** @type {!(Array|TypedArray)} */
    let finalSamples = [];
    if (samples.length > 0) {
      if (samples[0].constructor !== Number) {
        finalSamples = new Float64Array(samples[0].length * samples.length);
        for (let i = 0, len = samples[0].length, x = 0; i < len; i++) {
          for (let j = 0, subLen = samples.length; j < subLen; j++, x++) {
            finalSamples[x] = samples[j][i];
          }
        }
      } else {
        finalSamples = samples;
      }
    }
    return finalSamples;
  }
  
  /**
   * De-interleave samples into multiple channels.
   * @param {!(Array|TypedArray)} samples The samples.
   * @param {number} numChannels The number of channels to split the samples.
   * @param {Function} [OutputObject=Float64Array] The type of object to
   *   write the de-interleaved samples.
   * @return {!(Array|TypedArray)}
   */
  export function deInterleave(samples, numChannels, OutputObject=Float64Array) {
    /** @type {!(Array|TypedArray)} */
    let finalSamples = [];
    for (let i = 0; i < numChannels; i++) {
      finalSamples[i] = new OutputObject(samples.length / numChannels);
    }
    for (let i = 0; i < numChannels; i++) {
      for (let j = i, s = 0; j < samples.length; j+= numChannels, s++) {
        finalSamples[i][s] = samples[j];
      }
    }
    return finalSamples;
  }
  