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Simple API for reading / writing soundfiles

Project description

This package provides a simple and unified API to read and write sound-files to and from numpy arrays.



  • reads all the samples (or a fragment) from a soundfile and returns a tuplet (data, samplerate)
  • Data will always be as a numpy.float64, between -1 and 1, independently of bit-rate


  • reads chunks of frames, avoiding the allocation of all the samples in memory


  • returns SndInfo, a namedtuple with all the information of the sound-file


  • writes the samples.
  • samples need to be a numpy.float64 array with data between -1 and 1


  • allows you to write to the file as samples become available


Resample a numpy array to a new samplerate


# Normalize and save as flac
from sndfileio import sndread, sndwrite
samples, sr = sndread("in.wav")
maxvalue = max(samples.max(), -samples.min())
samples *= 1/maxvalue
sndwrite(samples, sr, "out.flac")
# Process a file in chunks
from sndfileio import *
from sndfileio.dsp import
with sndwrite_chunked(44100, "out.flac") as writer:
    for buf in sndread_chunked("in.flac"):
        # do some processing, like changing the gain
        buf *= 0.5


pip install sndfileio

External dependencies

  • libsndfile (apt install libsndfile1-dev)


In windows and macos all external dependencies are installed automatically


See the LICENSE file for license rights and limitations (MIT).

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