export function encodePcm(buffer: ArrayBuffer) {
  const bytes = new Uint8Array(buffer);
  let binary = "";
  for (let index = 0; index < bytes.length; index += 0x8000) {
    binary += String.fromCharCode(...bytes.subarray(index, index + 0x8000));
  }
  return btoa(binary);
}
export function decodePcm(base64: string) {
  const binary = atob(base64);
  const buffer = new ArrayBuffer(binary.length);
  const bytes = new Uint8Array(buffer);
  for (let index = 0; index < binary.length; index++) {
    bytes[index] = binary.charCodeAt(index);
  }
  const view = new DataView(buffer);
  const samples = new Float32Array(Math.floor(binary.length / 2));
  for (let index = 0; index < samples.length; index++) {
    const value = view.getInt16(index * 2, true);
    samples[index] = value < 0 ? value / 0x8000 : value / 0x7fff;
  }
  return samples;
}