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A Python module for reading and writing WAV files using numpy arrays.

Project description

wavio is a Python module that defines two functions:

  • reads a WAV file and returns an object that holds the sampling rate, sample width (in bytes), and a numpy array containing the data.

  • wavio.write writes a numpy array to a WAV file, optionally using a specified sample width.

The module uses the wave module in Python’s standard library, so it has the same limitations as that module. In particular, it does not support compressed WAV files, and it does not handle floating point WAV files. (When floating point data is passed to wavio.write it is converted to integers before being written to the WAV file.) The functions can read and write 8-, 16-, 24- and 32-bit integer WAV files.

wavio has been tested with Python versions 2.7, 3.4, 3.5, 3.6 and 3.7.

wavio depends on numpy (

The package has a suite of unit tests, but it should still be considered prototype-quality software. There may be backwards-incompatible API changes between releases.


The following code (also found in the docstring of wavio.write) writes a three second 440 Hz sine wave to a 24-bit WAV file:

import numpy as np
import wavio

rate = 22050  # samples per second
T = 3         # sample duration (seconds)
f = 440.0     # sound frequency (Hz)
t = np.linspace(0, T, T*rate, endpoint=False)
x = np.sin(2*np.pi * f * t)
wavio.write("sine24.wav", x, rate, sampwidth=3)


Warren Weckesser



BSD 2-clause (

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