Usage

audiofile can read and get metadata information for all files that are supported by ffmpeg, sox, and mediainfo, if those are available on your system. In addition, it can create WAV, FLAC, MP3, or OGG files.

Write a file

First, let’s create a dummy signal containing noise:

import audiofile
import numpy as np

sampling_rate = 8000  # in Hz
noise = np.random.normal(0, 1, sampling_rate)
noise /= np.amax(np.abs(noise))
audiofile.write("noise.flac", noise, sampling_rate)

File information

Now you can get metadata information on that signal:

audiofile.channels("noise.flac")

1

audiofile.duration("noise.flac")

1.0

audiofile.samples("noise.flac")

8000

audiofile.sampling_rate("noise.flac")

8000

audiofile.bit_depth("noise.flac")

16

Read a file

You can read the signal:

signal, sampling_rate = audiofile.read("noise.flac")

print(f"sampling rate: {sampling_rate}")
print(f"signal shape: {signal.shape}")

sampling rate: 8000
signal shape: (8000,)

If you prefer a workflow that returns a 2D signal with channel as the first dimension, enforce it with:

signal, sampling_rate = audiofile.read("noise.flac", always_2d=True)

print(f"sampling rate: {sampling_rate}")
print(f"signal shape: {signal.shape}")

sampling rate: 8000
signal shape: (1, 8000)

If you just want to read from 500 ms to 900 ms of the signal:

signal, sampling_rate = audiofile.read("noise.flac", offset=0.5, duration=0.4)

print(f"sampling rate: {sampling_rate}")
print(f"signal shape: {signal.shape}")

sampling rate: 8000
signal shape: (3200,)

Convert a file

You can convert any file to WAV using:

import audeer

audiofile.convert_to_wav("noise.flac", "noise.wav")

audeer.list_file_names(".", filetype="wav", basenames=True)

['noise.wav']

Resample/Remix a file

audiofile does not directly support resampling or remixing of an audio file during reading. But it can be easily achieved with audresample.

import audresample

target_rate = 16000
signal, sampling_rate = audiofile.read("noise.flac", always_2d=True)
signal = audresample.resample(signal, sampling_rate, target_rate)
signal = audresample.remix(signal, channels=[0, 0])
audiofile.write("noise-remix.flac", signal, target_rate)

print(f"sampling rate: {audiofile.sampling_rate('noise-remix.flac')}")
print(f"signal shape: {signal.shape}")

sampling rate: 16000
signal shape: (2, 16000)