Python wrapper for PortAudio's ring buffer
This module is designed to be used together with the sounddevice module (it might work with other modules, too) for non-blocking transfer of data between the main Python program and an audio callback function which is implemented in C or some other compiled language.
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:
For your own C code, you might need some definitions from the main PortAudio header:
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)
There are only two functions:
This function returns a string containing C declarations from the file pa_ringbuffer.h, which can be used as argument to CFFI’s cdef() function (see Usage above). Note that the returned declarations are slightly different when called on a macOS/Darwin system.
This function returns the RingBuffer class which is associated with the CFFI instance given by ffi and lib.
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:
- 0.1.1 (2017-09-04):
- Add buffer parameter
- 0.1.0 (2017-08-08):
- Initial release
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