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Generator based tools for working with audio clips.

Project description

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

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.mixer(
        (audiogen.tone(440), audiogen.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.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.sampler.write_wav(sys.stdout, audiogen.tone(440))

Or just:

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

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

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

Soundcard output

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

import audiogen
import itertools
import sys
    itertools.cycle(itertools.chain(audiogen.beep(), audiogen.silence(0.5)))

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

import audiogen
import itertools
import sys

    itertools.cycle(itertools.chain(audiogen.beep(), audiogen.silence(0.5)))

Then pipe to a command line audio player like Sox:

python | play -t wav -


Install with:

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

PyAudio is optional. If it’s not installed, playing audio via the soundcard with 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

Version history

  • 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

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