software sound synthesizer, audio streaming and conversion, and playback engine
Software sound synthesizer (FM/PWM oscillators), sound file streaming and conversion, and sound playback and mixing engine.
This software has been created by Irmen de Jong (email@example.com), and is distributed under the LGPL 3.0 software license (see 'LICENSE').
requires Python 3.5 or newer.
A waveform synthesizer that can generate different wave form samples: sine, triangle, sawtooth, square, pulse wave, harmonics and white noise. It also supports Frequency Modulation, Pulse-width modulation, and ADSR envelopes using LFOs.
For efficiency reasons, the oscillators and filters return their waveform values in small chunks/lists instead of per individual value. When running the synthesizer with pypy the speedup is remarkable over the older version (that used single value generators).
Sound playback engine. Supports multiple sound APIs, efficient sequential streaming or real-time mixing of shorter sound clips. The streaming is implemented via Python generators where the main generator essentially produces mixed sample fragments. These are written to an audio stream of one of the supported audio libraries. Synthplayer will detect them in this order:
No errors, but hearing no sound?
If you see no errors but hear nothing, you may need to manually configure the correct
output audio device. On some systems, the portaudio system audio library seems to report a wrong
default output audio device. In this case, you may get an
(describing the problem). You can also get another error (or no sound output at all,
without any errors at all...) If this happens, you can manually configure the output audio device
that should be used:
Either set the
PY_SYNTHPLAYER_AUDIO_DEVICE environment variable to the correct device number,
or set the
synthplayer.playback.default_audio_device parameter at the start of your code.
(The environment variable has priority over the code parameter)
To find the correct device number you can use the
query_devices method or type
python -m sounddevice.
Contains the Sample class that represents a digitized sound clip. It provides a set of simple sound manipulation methods such as changing the amplitude, fading in/out, and format conversions.
Provides various classes to stream audio data with. Uses ffmpeg or oggdec to read/stream many different sound formats.
Example program: jukebox.box
This is a jukebox like party sound player that allows to prepare a playlist, fade from a track to the next from the list, and insert random soundbytes for added fun. The songs are queried from a backend audio file database server program.
Example program: trackmixer
You assemble rhythm samples into bars and patterns, which are then mixed. Samples have to be in .wav format but can be anything that the Python wave module understands. The 'track' files are in a simple .ini format and can be edited with any text editor. Most of the file should be self explanatory but here are a few tips:
- Song bpm means beats per minute, which translates in how many bars are played per minute. If you put one kick/bass drum trigger in one bar, it exactly hits the specified number of beats per minute.
- Song ticks means how many ticks (or triggers) are in one bar. More ticks means more resolution. Nice for fast hi-hats.
- A bar is a sequence of instrument ticks (or triggers) where '.' means nothing is played at that instant, and another character such as 'x' means that the sample is played at that instant.
- you can separate bars with whitespace for easier readability
- pattern names are prefixed with
pattern.when writing their section (ini file limitation, you can't nest things)
- patterns can contain one or more bars per instrument (so you can have long and short patterns). However inside a pattern every instrument has to have the same number of bars.
Here is a very simple example of a track file:
[paths] # where to find the sample files samples = samples/ [samples] # list your samples here kick7 = biab_kick_7.wav snare2 = biab_sn_2.wav snare10 = biab_sn_10.wav hihat2 = biab_hat_2.wav hihat4 = biab_hat_4.wav [song] # basic song parameters and pattern sequence bpm = 128 ticks = 4 patterns = pat1 pat2 pat1 pat2 outro [pattern.pat1] hihat2 = x.x. x.x. x.x. x.x. snare2 = .... x... .... x... kick7 = x... x... x... x... [pattern.pat2] hihat4 = x.x. x.x. x.x. x.x. snare10 = .... .... x... x... [pattern.outro] hihat2 = x.x. x.x. hihat4 = .... x... kick7 = .... x...
invoking the mixer
To simply mix and stream your track file to your speakers use the following command:
python trackmixer.py mytrack.ini
To load your track file and start the interactive command line interface:
python trackmixer.py -i mytrack.ini
help to see what commands are available.
A few example tracks are provided, try them out! (pre-mixed output can be found in the example_mixes folder)
- track1.ini - a short jungle-ish fragment
- track2.ini - a somewhat longer classic rhythm loop, I guess it's in 4/4 time
- track3.ini - an experiment with a few liquid drum'n'bass type patterns
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