On Fri, Oct 31, 2014 at 5:48 PM, J Decker <d3c...@gmail.com> wrote: > > really nothing at all to do with cmake; a couple macros and you can > support cross-platform... a few less and you can init interfaces pretty > easily.... > at the end of init or during early discovery of functions, if they fail > you can fillthe interface with static methods or return a different > interface.... > > code part of > https://code.google.com/p/c-system-abstraction-component-gui/source/browse/src/streamlib/ffmpeg/ffmpeg_interface.c > > > #ifdef WIN32 > #define lib_format WIDE("avformat-56.dll") > #else > > #if defined( __ANDROID__) || defined( __LINUX__ ) > #define lib_format WIDE("libavformat.so") > #endif > > static struct fmpeg_interface > { > #define declare_func(a,b,c) a (CPROC *b) c > #define setup_func(lib, a,b,c) if( ffmpeg.b=(a(CPROC*)c)LoadFunction( lib, > _WIDE(#b) ) ) > > declare_func( void, av_register_all,(void) ); > declare_func( int, avformat_open_input, (AVFormatContext **ps, const char > *filename, AVInputFormat *fmt, AVDictionary **options) ); > /*...*/ > } ffmpeg; > > > void Init( void ) > { > setup_func( lib_format, void, av_register_all,(void) ); > setup_func( lib_format, int, avformat_open_input, (AVFormatContext **, > const char *, AVInputFormat *, AVDictionary **) ); > setup_func( lib_format, int, avformat_close_input, (AVFormatContext **) ); > } > > void LaterUsage( void ) > { > ffmpeg.av_register_all(); > } > > void LaterUsageAsPointer( void ) > { > struct fmpeg_interface interface = &ffmpeg; /* or from some other function > */ > interface->av_register_all(); > } > > if you have intellisense, makes for nice popups of available methods. > > Thanks. After a little Googling, I found this Dr. Dobbs article that describes, with source code, how create a plugin architecture.
Aaron
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