chromatone-theory/audio.js

Music theory needed to create chromatone empowered apps

export function initGetUserMedia() {
  window.AudioContext = window.AudioContext || window.webkitAudioContext
  if (!window.AudioContext) {
    return alert('AudioContext not supported')
  }

  // Older browsers might not implement mediaDevices at all, so we set an empty object first
  if (navigator.mediaDevices === undefined) {
    navigator.mediaDevices = {}
  }

  // Some browsers partially implement mediaDevices. We can't just assign an object
  // with getUserMedia as it would overwrite existing properties.
  // Here, we will just add the getUserMedia property if it's missing.
  if (navigator.mediaDevices.getUserMedia === undefined) {
    navigator.mediaDevices.getUserMedia = function (constraints) {
      // First get ahold of the legacy getUserMedia, if present
      const getUserMedia =
        navigator.webkitGetUserMedia || navigator.mozGetUserMedia

      // Some browsers just don't implement it - return a rejected promise with an error
      // to keep a consistent interface
      if (!getUserMedia) {
        alert('getUserMedia is not implemented in this browser')
      }

      // Otherwise, wrap the call to the old navigator.getUserMedia with a Promise
      return new Promise(function (resolve, reject) {
        getUserMedia.call(navigator, constraints, resolve, reject)
      })
    }
  }
}