source: roaraudio/include/libroar/roardl.h @ 5322:b40c1d7e6bb7

//roardl.h:

/*
 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2011
 *
 *  This file is part of libroar a part of RoarAudio,
 *  a cross-platform sound system for both, home and professional use.
 *  See README for details.
 *
 *  This file is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 3
 *  as published by the Free Software Foundation.
 *
 *  libroar is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this software; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 *  NOTE for everyone want's to change something and send patches:
 *  read README and HACKING! There a addition information on
 *  the license of this document you need to read before you send
 *  any patches.
 *
 *  NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc
 *  or libpulse*:
 *  The libs libroaresd, libroararts and libroarpulse link this lib
 *  and are therefore GPL. Because of this it may be illigal to use
 *  them with any software that uses libesd, libartsc or libpulse*.
 */

#ifndef _LIBROARROARDL_H_
#define _LIBROARROARDL_H_

#include "libroar.h"

#define ROAR_DL_FLAG_DEFAULTS          -1
#define ROAR_DL_FLAG_NONE               0x0000
#define ROAR_DL_FLAG_STATIC             0x0001 /* plugins are linked statically -lfoo */

#define ROAR_DL_HANDLE_DEFAULT          ((struct roar_dl_lhandle*)(void*)0)
#define ROAR_DL_HANDLE_NEXT             ((struct roar_dl_lhandle*)(void*)1)

#define ROAR_DL_FN_DSTR                 0
#define ROAR_DL_FN_CDRIVER              1
#define ROAR_DL_FN_TRANSCODER           2
#define ROAR_DL_FN_DRIVER               3
#define ROAR_DL_FN_SOURCE               4
#define ROAR_DL_FN_FILTER               5
#define ROAR_DL_FN_FF                   6 /* file format */
#define ROAR_DL_FN_AUTH                 7
#define ROAR_DL_FN_BRIDGE               8
#define ROAR_DL_FN_ROARDSCHED           9
#define ROAR_DL_FN_APPSCHED            10
#define ROAR_DL_FN_PROTO               11
#define ROAR_DL_FN_NOTIFY              12
#define ROAR_DL_FN_INIT                13 /* global plugin instance init. should be avoided */
//#define ROAR_DL_FN_               9
#define ROAR_DL_FN_MAX                 24

#define ROAR_DL_LIBPARA_VERSION         1
#define ROAR_DL_LIBNAME_VERSION         0
#define ROAR_DL_LIBINST_VERSION         1

#define ROAR_DL_PLUGIN(lib) struct roar_dl_libraryinst *                                          \
                             _##lib##_roaraudio_library_init(struct roar_dl_librarypara * para);  \
                            struct roar_dl_libraryinst *                                          \
                             _roaraudio_library_init(struct roar_dl_librarypara * para) {         \
                              return _##lib##_roaraudio_library_init(para);                       \
                            }                                                                     \
                            struct roar_dl_libraryinst *                                          \
                             _##lib##_roaraudio_library_init(struct roar_dl_librarypara * para)   \

#define ROAR_DL_PLUGIN_START(xlib) ROAR_DL_PLUGIN(xlib) {                                         \
                                     static int _inited = 0;                                      \
                                     static struct roar_dl_libraryinst lib;                       \
                                     static struct roar_dl_libraryname libname;                   \
                                     (void)para;                                                  \
                                     if ( _inited )                                               \
                                      return &lib;                                                \
                                     memset(&lib, 0, sizeof(lib));                                \
                                     lib.version = ROAR_DL_LIBINST_VERSION;                       \
                                     lib.len     = sizeof(lib);                                   \
                                     memset(&libname, 0, sizeof(libname));                        \
                                     libname.version = ROAR_DL_LIBNAME_VERSION;                   \
                                     libname.len     = sizeof(libname);                           \
                                     libname.name = #xlib;                                        \
                                     lib.libname  = &libname;                                     \
                                     do

#define ROAR_DL_PLUGIN_END          while(0);                                                     \
                                    _inited = 1;                                                  \
                                    return &lib;                                                  \
                                   }

#define ROAR_DL_PLUGIN_ABORT_LOADING(err) roar_err_set((err)); return NULL
#define ROAR_DL_PLUGIN_CHECK_VERSIONS(app,abi) if ( roar_dl_para_check_version(para, (app), (abi)) == -1 ) return NULL
#define ROAR_DL_PLUGIN_REG(fn, funcptr) (lib.func[(fn)] = (funcptr))
#define ROAR_DL_PLUGIN_REG_UNLOAD(func) (lib.unload = (func))
#define ROAR_DL_PLUGIN_REG_APPSCHED(sched) (lib.appsched = (sched))
#define ROAR_DL_PLUGIN_REG_GLOBAL_DATA(ptr,init) lib.global_data_len = sizeof((init)); \
                                                 lib.global_data_init = &(init);       \
                                                 lib.global_data_pointer = (void*)&(ptr)

enum roar_dl_loadercmd {
 ROAR_DL_LOADER_NOOP = 0
};

struct roar_dl_librarypara {
 int version;               // version of this struct type (must be ROAR_DL_LIBPARA_VERSION)
 size_t len;                // Length of this struct type (must be sizeof(struct roar_dl_librarypara)

 size_t refc;               // Reference counter.

 size_t argc;               // number of elements in argv
 struct roar_keyval * argv; // Parameter for the plugin
 void * args_store;         // Storage area for argv's data.
                            // If not NULL this and argv will be freed.
                            // If NULL argv will be left untouched.

 void * binargv;            // A pointer with binary data arguments.
                            // This can be used to pass any non-string data to
                            // the plugin. Normally this is NULL or the pointer
                            // to a struct with members of whatever is needed.

 const char * appname;      // application name in common format:
                            // Product/Version <VendorID/VendorName> (comments)
                            // Version and comment are optional and should be avoided.
                            // When no vendor ID is registered use <VendorName>.
                            // The VendorName MUST NOT contain a slash and SHOULD
                            // be as unique as possible.
                            // Examples: roard <0/RoarAudio>, MyAPP <myapp.org>,
                            //           AnAPP <Musterman GbR>
 const char * abiversion;   // The ABI version. For libraries this should be the SONAME.
                            // For applications this should be the version of the release
                            // which introduced the current ABI.
                            // Examples: libroar2, 0.5.1
 struct roar_notify_core * notifycore;
 int (*loader)(struct roar_dl_librarypara * lhandle, enum roar_dl_loadercmd cmd, void * argp);
};

struct roar_dl_libraryname {
 int      version;
 size_t   len;
 const char * name;        //Format: shortname
 const char * libname;     //This is the same as appname in struct roar_dl_librarypara.
                           //Format: Product <VendorID/VendorName> (comments)
 const char * libversion;  //This is the pure version number of the library.
 const char * abiversion;  //This is the same as abiversion in struct roar_dl_librarypara.
                           //Format: Version
 const char * description; //Free form.
 const char * contact;     //Format: first ["']nick["'] last (comment) <email>/OpenPGPkey/Phone/Room
 const char * authors;     //Other authors as free form.
 const char * license;     //Format: LicenseName-Version (options)
                           //Examples: GPL-3.0, LGPL-2.1, LGPL-3.0 (or later).
};

struct roar_dl_librarydep {
 int      version;
 size_t   len;
 const char * name;
 const char * libname;
 const char * abiversion;
};

struct roar_dl_libraryinst {
 int      version;
 size_t   len;
 int    (*unload)(struct roar_dl_librarypara * para, struct roar_dl_libraryinst * lib);
 int    (*func[ROAR_DL_FN_MAX])(struct roar_dl_librarypara * para, struct roar_dl_libraryinst * lib);
 struct roar_dl_libraryname * libname;
 size_t  global_data_len;
 void *  global_data_init;
 void ** global_data_pointer;
 struct roar_dl_librarydep * libdep;
 size_t libdep_len;
 struct roar_dl_appsched * appsched;
};

struct roar_dl_appsched {
 int (*init)  (struct roar_dl_librarypara * para);
 int (*free)  (struct roar_dl_librarypara * para);
 int (*update)(struct roar_dl_librarypara * para);
};

enum roar_dl_appsched_trigger {
 ROAR_DL_APPSCHED_INIT = 1,
#define ROAR_DL_APPSCHED_INIT ROAR_DL_APPSCHED_INIT
 ROAR_DL_APPSCHED_FREE,
#define ROAR_DL_APPSCHED_FREE ROAR_DL_APPSCHED_FREE
 ROAR_DL_APPSCHED_UPDATE
#define ROAR_DL_APPSCHED_UPDATE ROAR_DL_APPSCHED_UPDATE
};

// parameter functions:
struct roar_dl_librarypara * roar_dl_para_new(const char * args, void * binargv,
                                              const char * appname, const char * abiversion);
int roar_dl_para_ref                    (struct roar_dl_librarypara * para);
int roar_dl_para_unref                  (struct roar_dl_librarypara * para);
int roar_dl_para_check_version          (struct roar_dl_librarypara * para,
                                         const char * appname, const char * abiversion);

// 'core' dynamic loader functions.
struct roar_dl_lhandle * roar_dl_open   (const char * filename, int flags,
                                         int ra_init, struct roar_dl_librarypara * para);
int                      roar_dl_ref    (struct roar_dl_lhandle * lhandle);
int                      roar_dl_unref  (struct roar_dl_lhandle * lhandle);
#define roar_dl_close(x) roar_dl_unref((x))

void                   * roar_dl_getsym (struct roar_dl_lhandle * lhandle, const char * sym, int type);

int                      roar_dl_ra_init(struct roar_dl_lhandle * lhandle,
                                         const char * prefix,
                                         struct roar_dl_librarypara * para);

const char *             roar_dl_errstr (struct roar_dl_lhandle * lhandle);

// getting meta data:
struct roar_dl_librarypara       * roar_dl_getpara(struct roar_dl_lhandle * lhandle);
const struct roar_dl_libraryname * roar_dl_getlibname(struct roar_dl_lhandle * lhandle);

// context switching:
// _restore() is to switch from main to library context. _store() is to store library context
// and switch back to main context.
int                      roar_dl_context_restore(struct roar_dl_lhandle * lhandle);
int                      roar_dl_context_store(struct roar_dl_lhandle * lhandle);

// appsched:
int                      roar_dl_appsched_trigger(struct roar_dl_lhandle * lhandle, enum roar_dl_appsched_trigger trigger);

#endif

//ll