wav-parse

This is a WAV file parser designed to extract header metadata and amplitude data from WAV files. It is written to support a multitude of WAV file encodings including:

• Little/big endian encoding
• WAV Extensible data
  • A-law amplitude data
  • Mu-law amplitude data (need to add reader function)
  • Uncommon header chunks like fact/peak

This package is designed to run in both browser and Node environments. Because of this feross/buffer is being used under the hood to facilitate this and allow me to extend the Buffer class with custom readers without affecting the native Buffer in Node.

Examples

Using Node

// start by getting the byte data of a given WAV file
const buffer = fs.readFileSync('./test.wav')

// read just the header info
const { header, offset } = parseHead(buffer)
// offset represents the byte-size of the header.

// or read the header and all amplitude data
const { 
  chunkId,
  chunkSz,
  type,
  data,
  fmt,
  fact,
  peak
  amplitudeData,
} = readFile(buffer)
// amplitudeData will be a TypedArray

In the browser

// get a File object somehow

const readFileAsArrayBuffer = async (f: File): Promise<ArrayBuffer> => {
  const reader = new FileReader();

  return new Promise((res) => {
    reader.onload = (event) => {
      const result = event.target?.result as ArrayBuffer;
      res(result);
    };

    reader.readAsArrayBuffer(f);
  });
};

// turn file ref into ArrayBuffer of byte data
const arrBuffer = await readFileAsArrayBuffer(file)

// read the header info
const { header, offset } = parseHead(arrBuffer)