source: python/README.md @ a3f2695

Python aubio module
===================

This module wraps the aubio library for Python using the numpy module.

Using the Python aubio module
-----------------------------

After installing python-aubio, you will be able to import the aubio module:

    $ python
    [...]
    >>> import aubio
    >>> help(aubio.miditofreq)

Finding some inspiration
------------------------

Some examples are available in the `python/demos` directory. These scripts are
small programs written in python and using python-aubio.

For instance, `demo_source.py` reads a media file.

    $ ./python/demos/demo_source.py /path/to/sound/sample.wav

and `demo_timestretch_online.py` stretches the original file into a new one:

    $ ./python/demo/demo_timestretch_online.py loop.wav stretched_loop.wav 0.92`

Note: you might need to install additional modules to run some of the demos.
Some demos use [matplotlib](http://matplotlib.org/) to draw plots, others use
[PySoundCard](https://github.com/bastibe/PySoundCard) to play and record
sounds.

Testing the Python module
-------------------------

Python tests are in `python/tests` and use [pytest].

To run the all the python tests:

    $ cd aubio
    $ pytest

Each test script can also be called one at a time. For instance:

    $ pytest -v python/tests/test_note2midi.py

[pytest]: https://pytest.org

Install in a virtualenv
-----------------------

You should be able to install python-aubio directly from the top source
directory of aubio.

First, create a virtualenv to hold the required python module:

    $ virtualenv pyaubio
    $ source pyaubio/bin/activate

Now install and build the python extension using:

    $ pip install .

Install requirements
--------------------

Before compiling this module, you must have compiled libaubio.

A simple way to do this is with pip:

    $ pip install -r requirements.txt

For more information about how this module works, please refer to the [Python/C
API Reference Manual] (http://docs.python.org/c-api/index.html) and the
[Numpy/C API Reference](http://docs.scipy.org/doc/numpy/reference/c-api.html).

Compiling python aubio
----------------------

To build the aubio Python module, run the following command from the top source
directory of aubio:

    $ ./setup.py build

Note: if libaubio was previously built using waf, the script will use it.
Otherwise, the entire library will be built inside the python extension.

To find out more about `setup.py` options:

    $ ./setup.py --help

Installing
----------

To install the Python module:

    $ ./setup.py install

Alternatively, you may want to use the Python module without installing it by
setting your PYTHONPATH, for instance as follows:

    $ export PYTHONPATH=$PYTHONPATH:$PWD/`ls -rtd build/lib.* | head -1`:$PWD/tests