gstreamer/gst/gstplugin.c

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/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <string.h>
#include <gst/gstplugin.h>
/* list of loaded modules and its sequence number */
GList *_gst_modules;
gint _gst_modules_seqno;
/* global list of plugins and its sequence number */
GList *_gst_plugins;
gint _gst_plugins_seqno;
/* list of paths to check for plugins */
GList *_gst_plugin_paths;
/* whether or not to spew library load issues */
gboolean _gst_plugin_spew = FALSE;
void _gst_plugin_initialize() {
_gst_modules = NULL;
_gst_modules_seqno = 0;
_gst_plugins = NULL;
_gst_plugins_seqno = 0;
_gst_plugin_paths = NULL;
/* add the main (installed) library path */
_gst_plugin_paths = g_list_prepend(_gst_plugin_paths,PLUGINS_DIR);
/* if this is set, we add build-directory paths to the list */
#ifdef PLUGINS_USE_SRCDIR
/* the catch-all plugins directory */
_gst_plugin_paths = g_list_prepend(_gst_plugin_paths,
PLUGINS_SRCDIR "/plugins");
/* location libgstelements.so */
_gst_plugin_paths = g_list_prepend(_gst_plugin_paths,
PLUGINS_SRCDIR "/gst/elements");
_gst_plugin_paths = g_list_prepend(_gst_plugin_paths,
PLUGINS_SRCDIR "/gst/types");
#endif /* PLUGINS_USE_SRCDIR */
}
static gboolean gst_plugin_load_recurse(gchar *directory,gchar *name) {
DIR *dir;
struct dirent *dirent;
gboolean loaded = FALSE;
dir = opendir(directory);
if (dir) {
while (dirent = readdir(dir)) {
/* don't want to recurse in place or backwards */
if (strcmp(dirent->d_name,".") && strcmp(dirent->d_name,"..")) {
gst_plugin_load_recurse(g_strjoin("/",directory,dirent->d_name,
NULL),name);
}
}
closedir(dir);
} else {
if (strstr(directory,".so")) {
gchar *temp;
if (name) {
if ((temp = strstr(directory,name)) &&
(!strcmp(temp,name))) {
gst_plugin_load_absolute(directory);
return TRUE;
}
} else if ((temp = strstr(directory,".so")) &&
(!strcmp(temp,".so"))) {
gst_plugin_load_absolute(directory);
loaded = TRUE;
}
}
}
return loaded;
}
/**
* gst_plugin_load_all:
*
* Load all plugins in the path.
*/
void gst_plugin_load_all() {
GList *path;
path = _gst_plugin_paths;
while (path != NULL) {
gst_plugin_load_recurse(path->data,NULL);
path = g_list_next(path);
}
}
/**
* gst_plugin_load:
* @name: name of plugin to load
*
* Load the named plugin. Name should be given as
* &quot;libplugin.so&quot;.
*
* Returns: whether the plugin was loaded or not
*/
gboolean gst_plugin_load(gchar *name) {
GList *path;
gchar *libspath;
// g_print("attempting to load plugin '%s'\n",name);
path = _gst_plugin_paths;
while (path != NULL) {
if (gst_plugin_load_absolute(g_module_build_path(path->data,name)))
return TRUE;
libspath = g_strconcat(path->data,"/.libs",NULL);
// g_print("trying to load '%s'\n",g_module_build_path(libspath,name));
if (gst_plugin_load_absolute(g_module_build_path(libspath,name))) {
g_free(libspath);
return TRUE;
}
g_free(libspath);
// g_print("trying to load '%s' from '%s'\n",name,path->data);
if (gst_plugin_load_recurse(path->data,name)) {
return TRUE;
}
path = g_list_next(path);
}
return FALSE;
}
/**
* gst_plugin_load_absolute:
* @name: name of plugin to load
*
* Returns: whether or not the plugin loaded
*/
gboolean gst_plugin_load_absolute(gchar *name) {
GModule *module;
GstPluginInitFunc initfunc;
GstPlugin *plugin;
// g_print("trying to load '%s\n",name);
if (g_module_supported() == FALSE) {
g_print("wow, you built this on a platform without dynamic loading???\n");
return;
}
module = g_module_open(name,0);
if (module != NULL) {
if (g_module_symbol(module,"plugin_init",(gpointer *)&initfunc)) {
if (plugin = (initfunc)(module)) {
GList *factories;
plugin->filename = g_strdup(name);
_gst_modules = g_list_append(_gst_modules,module);
_gst_modules_seqno++;
_gst_plugins = g_list_append(_gst_plugins,plugin);
_gst_plugins_seqno++;
factories = plugin->elements;
while (factories) {
gst_elementfactory_register((GstElementFactory*)(factories->data));
factories = g_list_next(factories);
}
return TRUE;
}
}
} else if (_gst_plugin_spew) {
// if (strstr(g_module_error(),"No such") == NULL)
gst_info("error loading plugin: %s\n",g_module_error());
}
return FALSE;
}
/**
* gst_plugin_new:
* @name: name of new plugin
*
* Create a new plugin with given name.
*
* Returns: new plugin
*/
GstPlugin *gst_plugin_new(gchar *name) {
GstPlugin *plugin = (GstPlugin *)malloc(sizeof(GstPlugin));
plugin->name = g_strdup(name);
plugin->longname = NULL;
plugin->types = NULL;
plugin->elements = NULL;
return plugin;
}
/**
* gst_plugin_set_longname:
* @plugin: plugin to set long name of
* @longname: new long name
*
* Sets the long name (should be descriptive) of the plugin.
*/
void gst_plugin_set_longname(GstPlugin *plugin,gchar *longname) {
g_return_if_fail(plugin != NULL);
if (plugin->longname) g_free(plugin->longname);
plugin->longname = g_strdup(longname);
}
/**
* gst_plugin_find:
* @name: name of plugin to find
*
* Search the list of registered plugins for one of the given name
*
* Returns: pointer to the #GstPlugin if found, NULL otherwise
*/
GstPlugin *gst_plugin_find(gchar *name) {
GList *plugins = _gst_plugins;
g_return_if_fail(name != NULL);
while (plugins) {
GstPlugin *plugin = (GstPlugin *)plugins->data;
// g_print("plugin name is '%s'\n",plugin->name);
if (plugin->name) {
if (!strcmp(plugin->name,name))
return plugin;
}
plugins = g_list_next(plugins);
}
return NULL;
}
/**
* gst_plugin_find_elementfactory:
* @name: name of elementfactory to find
*
* Find a registered elementfactory by name.
*
* Returns: @GstElementFactory if found, NULL if not
*/
GstElementFactory *gst_plugin_find_elementfactory(gchar *name) {
GList *plugins, *factories;
GstElementFactory *factory;
g_return_if_fail(name != NULL);
plugins = _gst_plugins;
while (plugins) {
factories = ((GstPlugin *)(plugins->data))->elements;
while (factories) {
factory = (GstElementFactory*)(factories->data);
if (!strcmp(gst_element_get_name(GST_ELEMENT(factory)),name))
return (GstElementFactory*)(factory);
factories = g_list_next(factories);
}
plugins = g_list_next(plugins);
}
return NULL;
}
/**
* gst_plugin_add_factory:
* @plugin: plugin to add factory to
* @factory: factory to add
*
* Add factory to the list of those provided by the element.
*/
void gst_plugin_add_factory(GstPlugin *plugin,GstElementFactory *factory) {
g_return_if_fail(plugin != NULL);
g_return_if_fail(factory != NULL);
// g_print("adding factory to plugin\n");
plugin->elements = g_list_append(plugin->elements,factory);
}
GList *gst_plugin_get_list() {
return _gst_plugins;
}