CN's foundational audio drivers

See CNFA.h for more help and use info.

This toolset is 100% based around sound callbacks.

You get three functions:

struct CNFADriver* CNFAInit(const char* driver_name,
                            const char* your_name,
                            CNFACBType cb,
                            int reqSPSPlay,
                            int reqSPSRec,
                            int reqChannelsPlay,
                            int reqChannelsRec,
                            int sugBufferSize,
                            const char* outputSelect,
                            const char* inputSelect,
                            void* opaque)

// Returns bitmask: 1 if mic recording, 2 if playback running, 3 if both running.
int CNFAState(struct CNFADriver* cnfaobject)

void CNFAClose(struct CNFADriver* cnfaobject)

Then it goes and calls a callback function, the CNFACBType cb parameter. This can feed you new frames, or you can pass frames back in.

void Callback(struct CNFADriver* sd, short* out, short* in, int framesp, int framesr)
{
  int i;
  for( i = 0; i < framesr * sd->channelsRec; i++ ) 
    short value = in[i];
  for( i = 0; i < framesp * sd->channelsPlay; i++ )
    out[i] = 0; //Send output frames.
}

This repo does not contain any tests or building, as this is intended as a library-only. For any use, please see colorchord: https://github.com/cnlohr/colorchord

If you would like to use CNFA in a project where using a DLL or SO file is more practical, you can easily build those files. The below steps are for the Clang & GGC compilers, but others like TCC should work fine as well, just have not been tested.

NOTE: In order for functions to be exported, you'll need to make sure -DBUILD_DLL is specified!

Parts of CNFA rely on rawdraw, so make sure to clone this repo somewhere and insert the path to it in the [RAWDRAW PATH] space below:

Windows build:

& "C:\Program Files\LLVM\bin\clang.exe" CNFA.c -shared -o CNFA.dll -DWINDOWS -DCNFA_IMPLEMENTATION -DBUILD_DLL -D_CRT_SECURE_NO_WARNINGS -I"[RAWDRAW PATH]" -lmmdevapi -lavrt -lole32

Linux build:

make shared-example

This will build the shared library as libCNFA.so and will build the example project to link against it. You can run the example project with ./example. The makefile will try and copy the os_generic.h header from rawdraw automatically using wget.

The command to build simply build the shared library is:

gcc CNFA.c -shared -fpic -o CNFA.so -DCNFA_IMPLEMENTATION -DBUILD_DLL -I"[RAWDRAW PATH]" -lasound -lpulse -lpthread