libquiet ctypes binding

[xiongyihui]

@brian-armstrong
This is an attempt to build a ctypes binding for libquiet. Hope it helps.

Changes

• update scripts/libs.sh
  • without fftw3 - reduce dependencies, avoid GPL (fftw3) vs MIT/BSD (libquit)
  • without portaudio - reduce dependencies, use pyaudio in python
• add quiet/quiet.py - ctypes binding for libquiet.so
• update setup.py

Usage

See examples decode() and test() of quiet/quiet.py

known issues

• if portaudio lib is in system lib path, libquiet will use it, which cause link error. A quick fix is to remove portaudio-dev library

• not work on ARM (raspberry pi). It seems libcorrect is not a complete replacement for libfec. The error message is:

  /home/pi/quiet.py/sysroot/usr/lib/libliquid.so: undefined reference to `P_init'                                             
  /home/pi/quiet.py/sysroot/usr/lib/libliquid.so: undefined reference to `Partab'                                             
  /home/pi/quiet.py/sysroot/usr/lib/libliquid.so: undefined reference to `partab_init' 
  

[brian-armstrong]

Thanks, I'll take a look at this. It's really cool you put this together.

My plan (and existing WIP) goes in a different direction, binding quiet from inside a C python extension. That's probably going to take a while to finish and isn't particularly high priority though. I'll see about how to provide this in the interim.

Regarding ARM, those missing symbols aren't used by liquid directly. I seem to remember they're specific to libfec. Did you happen to link liquid against fec and then drop in correct+shim? That may not build the correct linkage.

Edit: to clarify, I suspect compiling against fec may be the issue. I think it has some extern symbols in use in its header file. Compiling against correct will fix this.

[xiongyihui]

Oh, the libcorrect works on ARM, I forgot to remove the header file /usr/local/include/fec.h of the libfec.

[JarbasAl]

any updates on this issue? I would like to implement quiet in some python projects and this would help a lot