pa-ringbuffer 0.1.1

Usage

This module is not meant to be used on its own, it is only useful in cooperation with another Python module using CFFI. For an example, have a look at https://github.com/spatialaudio/python-rtmixer.

You can get the Python code from PyPI, for example in your setup.py file (in the following example, your module would be called mycffimodule):

from setuptools import setup

setup(
    name=...,
    version=...,
    author=...,
    ...,
    cffi_modules=['mycffimodule_build.py:ffibuilder'],
    setup_requires=['CFFI', 'pa_ringbuffer'],
    install_requires=['pa_ringbuffer'],
    ...,
)

Alternatively, you can just copy the file src/pa_ringbuffer.py to your own source directory and import it from there.

You can build your own CFFI module like described in http://cffi.readthedocs.io/en/latest/cdef.html, just adding a few more bits to your mycffimodule_build.py:

from cffi import FFI
import pa_ringbuffer

ffibuilder = FFI()
ffibuilder.cdef(pa_ringbuffer.cdef())
ffibuilder.cdef("""

/* my own declarations */

""")
ffibuilder.set_source(
    '_mycffimodule',
    '/* my implementation */',
    sources=['portaudio/src/common/pa_ringbuffer.c'],
)

if __name__ == '__main__':
    ffibuilder.compile(verbose=True)

Note that the following files must be available to the compiler:

• https://app.assembla.com/spaces/portaudio/git/source/master/src/common/pa_ringbuffer.c

• https://app.assembla.com/spaces/portaudio/git/source/master/src/common/pa_ringbuffer.h

• https://app.assembla.com/spaces/portaudio/git/source/master/src/common/pa_memorybarrier.h

For your own C code, you might need some definitions from the main PortAudio header:

• https://app.assembla.com/spaces/portaudio/git/source/master/include/portaudio.h

Once you have compiled your extension module (with the help of CFFI), you can use something like this in your own module to get access to the RingBuffer class:

import pa_ringbuffer
from _mycffimodule import ffi, lib

RingBuffer = pa_ringbuffer.init(ffi, lib)

API Reference

There are only two functions:

Creating the Documentation

The documentation of the RingBuffer class is not available separately. If you are using Sphinx, you can seamlessly include the documentation of the RingBuffer class with your own documentation. An example for this can be found at https://github.com/spatialaudio/python-rtmixer, the generated documentation is available at http://python-rtmixer.readthedocs.io/#rtmixer.RingBuffer.

You’ll need to have the autodoc extension activated in your conf.py:

extensions = [
    ...,
    'sphinx.ext.autodoc',
    ...,
]

And somewhere within your module documentation, you should add this:

.. autoclass:: RingBuffer
   :inherited-members:

Before that, you might have to use the currentmodule directive to select your own module. Using automodule should also do.

Version History

0.1.1 (2017-09-04):

• Add buffer parameter

0.1.0 (2017-08-08):

Initial release