musicvis-lib/src/utils/BlobUtils.js

Music analysis and visualization library

/**
 * @module utils/BlobUtils
 */

/**
 * Converts a Blob to a base64 string
 *
 * @param {Blob} blob Blob
 * @returns {Promise<string,undefined>} base64 string
 */
export function blobToBase64 (blob) {
  return new Promise((resolve) => {
    const reader = new FileReader()
    reader.onloadend = () => resolve(reader.result)
    reader.readAsDataURL(blob)
  })
}

/**
 * Extracts the file extension from a Blob, so it can be saved as a file with
 * an appropriate extension.
 *
 * @param {Blob} blob Blob
 * @returns {string} file extension
 */
export function blobToFileExtension (blob) {
  return blob.type.split('/')[1].split(';')[0]
}