audiogen-p3 0.0.1

Generator based tools for working with audio clips.

The audiogen_p3 package provides time domain audio processing tools using Python generators.

Please note, this is a forked repository from “audiogen” by user “casebeer” updated to work with Python3 since the original package has been unmaintained for a few years. The only modifications to this package were to allow use in Python 3. The remainder of the code is all original work by Christopher H. Casebeer

This makes some types of audio sample generation and processing pretty easy:

# mix 440 Hz and 445 Hz tones to get 5 Hz beating
beats = audiogen_p3.mixer(
    (audiogen_p3.tone(440), audiogen_p3.tone(445)),
    [(constant(1), constant(1)),]
)

The actual samples won’t be generated or stored in memory until they’re actually consumed – for instance, when they’re being written out to disk in a wave file:

with open("output.wav", "wb") as f:
    audiogen_p3.sampler.write_wav(f, beats)

Generators’ at-consumption-time computation also allows creating infinitely long output, e.g. to stream to speakers rather than a file on disk:

audiogen_p3.sampler.write_wav(sys.stdout, audiogen_p3.tone(440))

Or just:

audiogen_p3.sampler.play(audiogen_p3.tone(440))

You can also use standard generator tools, e.g. the itertools module, to handle audio data:

beep_silence = itertools.chain(audiogen_p3.beep(), audiogen_p3.silence(0.5))
infinite_beeps = itertools.cycle(beep_silence)

audiogen_p3.sampler.write_wav(sys.stdout, infinite_beeps)

Soundcard output

The easiest way to play directly to a soundcard output is to use the audiogen_p3.sampler.play function, which will play your samples using PyAudio:

import audiogen_p3
import itertools
import sys

audiogen_p3.sampler.play(
    itertools.cycle(itertools.chain(audiogen_p3.beep(), audiogen_p3.silence(0.5)))
)

Alternatively, you could write your wave data to stdout, e.g. myaudio.py:

import audiogen_p3
import itertools
import sys

audiogen_p3.sampler.write_wav(
    sys.stdout,
    itertools.cycle(itertools.chain(audiogen_p3.beep(), audiogen_p3.silence(0.5)))
)

Then pipe to a command line audio player like Sox:

python myaudio.py | play -t wav -

Installation

Install with:

$ pip install audiogen_p3
$ pip install --allow-external PyAudio --allow-unverified PyAudio PyAudio

PyAudio is optional. If it’s not installed, playing audio via the soundcard with audiogen_p3.sampler.play() will not be available, but generating Wave files – including for piping to an external player, like sox – will work just fine.

Note that to install PyAudio on Mac OS X, you’ll need to first install portaudio:

$ brew install portaudio

Contributing

Get the source and report any bugs on Github:

https://github.com/rguisewite/audiogen_p3

Original Code from Christopher H. Casebeer (casebeer):

https://github.com/rguisewite/audiogen

Version history

• 0.1.2 - Add band pass and band stop IIR filters; custom beep lengths from @jhobbs

• 0.1.1 - Fix multiplexing bug causing increase in pitch when using mixer() to produce more than one output channel

• 0.1.0 - Breaking changes: new arguments to tone(), play() blocks by default