Python WAV File RIFF Header Reader

wav-riff-reader.py

import struct
import io

class WAVFile:

  def __init__(self, filename):
    self.filename = filename

  def read(self):
    with io.open(self.filename, 'rb') as fh:
      riff, size, fformat = struct.unpack('<4sI4s', fh.read(12))
      print("Riff: %s, Chunk Size: %i, format: %s" % (riff, size, fformat))

      #Read header
      chunk_header = fh.read(8)
      subchunkid, subchunksize = struct.unpack('<4sI', chunk_header)

      if (subchunkid == b'fmt '):
        aformat, channels, samplerate, byterate, blockalign, bps = struct.unpack('HHIIHH', fh.read(16))
        bitrate = (samplerate * channels * bps) / 1024
        print("Format: %i, Channels %i, Sample Rate: %i, Kbps: %i" % (aformat, channels, samplerate, bitrate))

      chunkOffset = fh.tell()
      while (chunkOffset < size):
        fh.seek(chunkOffset)
        subchunk2id, subchunk2size = struct.unpack('<4sI', fh.read(8))
        print("chunk id: %s, size: %i" % (subchunk2id, subchunk2size))
        if (subchunk2id == b'LIST'):
          listtype = struct.unpack('<4s', fh.read(4))
          print("\tList Type: %s, List Size: %i" % (listtype, subchunk2size))
          
          listOffset = 0;
          while((subchunk2size - 8) >= listOffset):
            listitemid, listitemsize = struct.unpack('<4sI', fh.read(8))
            listOffset = listOffset + listitemsize + 8
            listdata = fh.read(listitemsize)
            print("\tList id %s, size: %i, data: %s" % (listitemid.decode('ascii'), listitemsize, listdata.decode("ascii")))
            print("\tOffset: %i" % listOffset)
        elif (subchunk2id == b'data'):
          print("Found data")
        else:
          print("Data: %s" % fh.read(subchunk2size).decode('ascii'))

        chunkOffset = chunkOffset + subchunk2size + 8

wavFile = WAVFile('../static/audio/VT17224028 - Copy.wav')
wavFile.read()

Thanks for the script 👍

Very useful. Thank you!