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|
/* plugin~, a Pd tilde object for hosting LADSPA/VST plug-ins
Copyright (C) 2001 Jarno Seppänen
Copyright (C) 2000 Richard W.E. Furse
$Id: vstutils.c,v 1.1 2002-11-19 09:51:40 ggeiger Exp $
This file is part of plugin~.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifdef WIN32 /* currently for Windows only */
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "vst/AEffect.h" /* VST-specific stuff */
#include <windows.h> /* LoadLibrary, FreeLibrary etc. Windows-specific */
#include "vstutils.h"
#include "win/vitunmsvc.h" /* strncasecmp */
/* OS-specific things */
#ifdef WIN32
#define CHR_DIR_SLASH '\\'
#define CHR_PATH_DELIM ';'
#define STR_DIR_SLASH "\\"
#define STR_LIB_SUFFIX ".dll"
#endif
#ifdef __linux__ /* FIXME? */
#define CHR_DIR_SLASH '/'
#define CHR_PATH_DELIM ':'
#define STR_DIR_SLASH "/"
#define STR_LIB_SUFFIX ".so"
#endif
void*
vstutils_load_vst_plugin_dll (const char* plugin_dll_filename)
{
HINSTANCE* dll = NULL;
char* buf = NULL;
size_t fnlength = 0;
const size_t suffixlength = strlen (STR_LIB_SUFFIX);
/* precondition */
assert (plugin_dll_filename != NULL);
dll = (HINSTANCE*)calloc (1, sizeof (HINSTANCE));
fnlength = strlen (plugin_dll_filename);
/* assure the file name ends in ".so", ".dll" or equivalent */
if (fnlength > suffixlength) {
int has_lib_suffix = 0;
has_lib_suffix
= (strncasecmp (&plugin_dll_filename[fnlength - suffixlength],
STR_LIB_SUFFIX,
suffixlength + 1)
== 0);
if (!has_lib_suffix) {
buf = calloc (fnlength + suffixlength + 1, sizeof (char));
strcpy (buf, plugin_dll_filename);
strcat (buf, STR_LIB_SUFFIX);
plugin_dll_filename = buf;
fnlength += suffixlength;
}
}
/* First we just try loading by absolute directory name or via
default system paths. */
*dll = LoadLibrary (plugin_dll_filename);
if (*dll != NULL) {
goto VSTUTILS_LOAD_DLL_RETURN_DLL;
}
/* If the filename is not absolute then we wish to check along the
VST_PATH to see if we can find the file there. */
if (plugin_dll_filename[0] != CHR_DIR_SLASH) {
const char* vst_path = getenv ("VST_PATH");
if (vst_path != NULL) {
const char* dir_start = NULL;
const char* dir_end = NULL;
dir_start = vst_path;
while (*dir_start != '\0') {
dir_end = dir_start;
while (*dir_end != CHR_PATH_DELIM
&& *dir_end != '\0') {
dir_end++;
}
if (dir_end > dir_start) {
char* absfn = NULL; /* absolute filename */
absfn = calloc (dir_end - dir_start /* directory */
+ 1 /* slash */
+ fnlength /* basename */
+ 1, /* null */
sizeof (char));
/* start with directory */
strncpy (absfn, dir_start, dir_end - dir_start);
/* append slash if necessary */
if (*(dir_end - 1) != CHR_DIR_SLASH) {
strcat (absfn, STR_DIR_SLASH);
}
/* finally append dll filename */
strcat (absfn, plugin_dll_filename);
#if 0
fprintf (stderr, "plugin~_vst: attempting \"%s\"\n", absfn);
#endif
*dll = LoadLibrary (absfn);
free (absfn);
if (*dll != NULL) {
goto VSTUTILS_LOAD_DLL_RETURN_DLL;
}
}
/* if not found, try next directory from path */
dir_start = dir_end;
if (*dir_start == CHR_PATH_DELIM) {
dir_start++;
}
}
} else {
fputs ("warning: You haven't specified the VST_PATH environment variable and didn't specify an absolute path to the plug-in.\n"
"Please set the VST_PATH variable to point to your VST plug-in directories (eg. \"set VST_PATH=C:\\Program Files\\Steinberg\\Vstplugins\").\n", stderr);
}
}
/* No luck */
assert (*dll == NULL);
free (dll);
/* remember to check and free buf! */
if (buf != NULL) {
free (buf);
buf = NULL;
}
return NULL;
VSTUTILS_LOAD_DLL_RETURN_DLL:
assert (*dll != NULL);
/* remember to check and free buf! */
if (buf != NULL) {
free (buf);
buf = NULL;
}
return dll;
}
void
vstutils_unload_vst_plugin_dll (void* plugin_dll)
{
HINSTANCE* dll = plugin_dll;
if (dll != NULL) {
FreeLibrary (*dll);
*dll = NULL;
free (plugin_dll);
}
}
AEffect*
vstutils_init_vst_plugin (void* plugin_dll,
const char* plugin_dll_filename,
audioMasterCallback am)
{
typedef AEffect* (*vst_main_func)(audioMasterCallback am);
HINSTANCE* dll = plugin_dll;
vst_main_func vstmain;
AEffect* plugin = NULL;
if (plugin_dll == NULL
|| *dll == NULL) {
return NULL;
}
vstmain = (vst_main_func)GetProcAddress (*dll, "main");
if (vstmain == NULL) {
char* error = NULL;
FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER
| FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError (),
MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
error,
0,
NULL);
fprintf (stderr,
"Unable to find main() function in VST plugin "
"DLL file \"%s\": %s.\n"
"Are you sure this is a VST plugin file?\n",
plugin_dll_filename, error);
LocalFree (error);
}
/* Initialize plugin */
plugin = vstmain (am);
/* Check that what we have loaded really IS a VST plugin */
if (plugin->magic != kEffectMagic) {
fprintf (stderr,
"DLL file \"%s\" is not a genuine VST plugin.\n",
plugin_dll_filename);
return NULL;
}
return plugin;
}
#endif /* WIN32 */
/* EOF */
|
