On 13-11-03 09:57 AM, Christopher Arndt wrote:
Hi Lenard,
On 02.11.2013 02:25, Lenard Lindstrom wrote:
Just wondering, if the Python level callback is found to be too slow, could a
C level callback mechanism be provided?
how would you suggest this should be used? From Python or C?
In python-rtmidi this is currently not possible from Python, because
'MidiIn.set_callback' wraps a Python callback function with a C function
implemented in Cython (and you can't access the C++ object directly in
Python, only in the Cython code).
I guess it would be easy to make the C++ method 'RtMidiIn.setCallback'
available directly in Python, but I'm not sure how a pointer to a C
function could be passed by Python then or how such a pointer could be
obtained by Python.
So any ideas about a suitable API for this? And how it would tie into
PyGame's C code?
Chris
Cython has a C level sharing mechanism with cimport:
http://docs.cython.org/src/userguide/sharing_declarations.html#sharing-declarations-between-cython-modules
This should be usable from a standard C extension module. So something like:
int RtMidi_SetCallback(PyObject *midi_in, RtMidiCallback callback, void
*data);
Anyway, I don't see any rush in implementing this. It may be that using
a Python callback will be fast enough.
Lenard
