mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-25 11:11:08 +00:00
7c1d33a8a3
See 8fe63000de for why having a TRUE/FALSE
return value is a bad idea.
I've scanned a few plugins and they generally get it wrong and aren't
unloadable when they return FALSE.
391 lines
14 KiB
C
391 lines
14 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstplugin.h: Header for plugin subsystem
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_PLUGIN_H__
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#define __GST_PLUGIN_H__
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#include <gst/gstconfig.h>
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#include <time.h> /* time_t */
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#include <sys/types.h> /* off_t */
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#include <sys/stat.h> /* off_t */
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#include <gmodule.h>
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#include <gst/gstobject.h>
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#include <gst/gstmacros.h>
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#include <gst/gststructure.h>
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G_BEGIN_DECLS
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typedef struct _GstPlugin GstPlugin;
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typedef struct _GstPluginClass GstPluginClass;
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typedef struct _GstPluginPrivate GstPluginPrivate;
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typedef struct _GstPluginDesc GstPluginDesc;
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/**
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* gst_plugin_error_quark:
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*
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* Get the error quark.
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*
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* Returns: The error quark used in GError messages
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*/
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GQuark gst_plugin_error_quark (void);
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/**
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* GST_PLUGIN_ERROR:
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*
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* The error message category quark
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*/
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#define GST_PLUGIN_ERROR gst_plugin_error_quark ()
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/**
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* GstPluginError:
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* @GST_PLUGIN_ERROR_MODULE: The plugin could not be loaded
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* @GST_PLUGIN_ERROR_DEPENDENCIES: The plugin has unresolved dependencies
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* @GST_PLUGIN_ERROR_NAME_MISMATCH: The plugin has already be loaded from a different file
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*
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* The plugin loading errors
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*/
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typedef enum
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{
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GST_PLUGIN_ERROR_MODULE,
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GST_PLUGIN_ERROR_DEPENDENCIES,
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GST_PLUGIN_ERROR_NAME_MISMATCH
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} GstPluginError;
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/**
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* GstPluginFlags:
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* @GST_PLUGIN_FLAG_CACHED: Temporarily loaded plugins
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* @GST_PLUGIN_FLAG_BLACKLISTED: The plugin won't be scanned (again)
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*
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* The plugin loading state
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*/
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typedef enum
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{
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GST_PLUGIN_FLAG_CACHED = (1<<0),
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GST_PLUGIN_FLAG_BLACKLISTED = (1<<1)
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} GstPluginFlags;
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/**
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* GstPluginDependencyFlags:
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* @GST_PLUGIN_DEPENDENCY_FLAG_NONE : no special flags
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* @GST_PLUGIN_DEPENDENCY_FLAG_RECURSE : recurse into subdirectories
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* @GST_PLUGIN_DEPENDENCY_FLAG_PATHS_ARE_DEFAULT_ONLY : use paths
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* argument only if none of the environment variables is set
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* @GST_PLUGIN_DEPENDENCY_FLAG_FILE_NAME_IS_SUFFIX : interpret
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* filename argument as filter suffix and check all matching files in
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* the directory
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*
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* Flags used in connection with gst_plugin_add_dependency().
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*
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* Since: 0.10.22
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*/
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typedef enum {
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GST_PLUGIN_DEPENDENCY_FLAG_NONE = 0,
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GST_PLUGIN_DEPENDENCY_FLAG_RECURSE = (1 << 0),
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GST_PLUGIN_DEPENDENCY_FLAG_PATHS_ARE_DEFAULT_ONLY = (1 << 1),
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GST_PLUGIN_DEPENDENCY_FLAG_FILE_NAME_IS_SUFFIX = (1 << 2)
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} GstPluginDependencyFlags;
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/**
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* GstPluginInitFunc:
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* @plugin: The plugin object
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*
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* A plugin should provide a pointer to a function of this type in the
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* plugin_desc struct.
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* This function will be called by the loader at startup. One would then
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* register each #GstPluginFeature.
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*
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* Returns: %TRUE if plugin initialised successfully
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*/
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/* FIXME 0.11: Make return void */
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typedef gboolean (*GstPluginInitFunc) (GstPlugin *plugin);
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/**
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* GstPluginInitFullFunc:
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* @plugin: The plugin object
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* @user_data: extra data
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*
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* A plugin should provide a pointer to a function of either #GstPluginInitFunc
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* or this type in the plugin_desc struct.
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* The function will be called by the loader at startup. One would then
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* register each #GstPluginFeature. This version allows
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* user data to be passed to init function (useful for bindings).
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*
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* Returns: %TRUE if plugin initialised successfully
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*
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* Since: 0.10.24
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*
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*/
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/* FIXME 0.11: Merge with GstPluginInitFunc */
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typedef gboolean (*GstPluginInitFullFunc) (GstPlugin *plugin, gpointer user_data);
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/**
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* GstPluginDesc:
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* @major_version: the major version number of core that plugin was compiled for
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* @minor_version: the minor version number of core that plugin was compiled for
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* @name: a unique name of the plugin
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* @description: description of plugin
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* @plugin_init: pointer to the init function of this plugin.
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* @version: version of the plugin
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* @license: effective license of plugin
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* @source: source module plugin belongs to
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* @package: shipped package plugin belongs to
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* @origin: URL to provider of plugin
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* @_gst_reserved: private, for later expansion
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*
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* A plugin should export a variable of this type called plugin_desc. The plugin
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* loader will use the data provided there to initialize the plugin.
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*
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* The @licence parameter must be one of: LGPL, GPL, QPL, GPL/QPL, MPL,
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* BSD, MIT/X11, Proprietary, unknown.
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*/
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struct _GstPluginDesc {
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gint major_version;
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gint minor_version;
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const gchar *name;
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const gchar *description;
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GstPluginInitFunc plugin_init;
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const gchar *version;
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const gchar *license;
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const gchar *source;
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const gchar *package;
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const gchar *origin;
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gpointer _gst_reserved[GST_PADDING];
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};
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#define GST_TYPE_PLUGIN (gst_plugin_get_type())
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#define GST_IS_PLUGIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_PLUGIN))
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#define GST_IS_PLUGIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_PLUGIN))
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#define GST_PLUGIN_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_PLUGIN, GstPluginClass))
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#define GST_PLUGIN(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_PLUGIN, GstPlugin))
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#define GST_PLUGIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_PLUGIN, GstPluginClass))
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#define GST_PLUGIN_CAST(obj) ((GstPlugin*)(obj))
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/**
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* GstPlugin:
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*
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* The plugin object
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*/
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struct _GstPlugin {
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GstObject object;
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/*< private >*/
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GstPluginDesc desc;
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GstPluginDesc *orig_desc;
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unsigned int flags;
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gchar * filename;
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gchar * basename; /* base name (non-dir part) of plugin path */
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GModule * module; /* contains the module if plugin is loaded */
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off_t file_size;
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time_t file_mtime;
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gboolean registered; /* TRUE when the registry has seen a filename
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* that matches the plugin's basename */
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GstPluginPrivate *priv;
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gpointer _gst_reserved[GST_PADDING - 1];
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};
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struct _GstPluginClass {
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GstObjectClass object_class;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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/**
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* GST_PLUGIN_DEFINE:
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* @major: major version number of the gstreamer-core that plugin was compiled for
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* @minor: minor version number of the gstreamer-core that plugin was compiled for
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* @name: short, but unique name of the plugin
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* @description: information about the purpose of the plugin
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* @init: function pointer to the plugin_init method with the signature of <code>static gboolean plugin_init (GstPlugin * plugin)</code>.
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* @version: full version string (e.g. VERSION from config.h)
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* @license: under which licence the package has been released, e.g. GPL, LGPL.
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* @package: the package-name (e.g. PACKAGE_NAME from config.h)
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* @origin: a description from where the package comes from (e.g. the homepage URL)
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*
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* This macro needs to be used to define the entry point and meta data of a
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* plugin. One would use this macro to export a plugin, so that it can be used
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* by other applications.
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*
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* The macro uses a define named PACKAGE for the #GstPluginDesc,source field.
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*/
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#define GST_PLUGIN_DEFINE(major,minor,name,description,init,version,license,package,origin) \
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G_BEGIN_DECLS \
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GST_PLUGIN_EXPORT GstPluginDesc gst_plugin_desc = { \
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major, \
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minor, \
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name, \
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(gchar *) description, \
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init, \
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version, \
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license, \
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PACKAGE, \
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package, \
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origin, \
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GST_PADDING_INIT \
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}; \
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G_END_DECLS
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/**
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* GST_PLUGIN_DEFINE_STATIC:
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* @major: major version number of the gstreamer-core that plugin was compiled for
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* @minor: minor version number of the gstreamer-core that plugin was compiled for
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* @name: short, but unique name of the plugin
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* @description: information about the purpose of the plugin
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* @init: function pointer to the plugin_init method with the signature of <code>static gboolean plugin_init (GstPlugin * plugin)</code>.
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* @version: full version string (e.g. VERSION from config.h)
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* @license: under which licence the package has been released, e.g. GPL, LGPL.
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* @package: the package-name (e.g. PACKAGE_NAME from config.h)
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* @origin: a description from where the package comes from (e.g. the homepage URL)
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*
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* This macro needs to be used to define the entry point and meta data of a
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* local plugin. One would use this macro to define a local plugin that can only
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* be used by the own application.
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*
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* The macro uses a define named PACKAGE for the #GstPluginDesc.source field.
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*
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* Deprecated: Use gst_plugin_register_static() instead. This macro was
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* deprecated because it uses constructors, which is a compiler feature not
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* available on all compilers.
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*
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*/
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/* We don't have deprecation guards here on purpose, it's enough to have
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* deprecation guards around _gst_plugin_register_static(), and will result in
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* much better error messages when compiling with -DGST_DISABLE_DEPRECATED */
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#define GST_PLUGIN_DEFINE_STATIC(major,minor,name,description,init,version,license,package,origin) \
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static void GST_GNUC_CONSTRUCTOR \
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_gst_plugin_static_init__ ##init (void) \
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{ \
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static GstPluginDesc plugin_desc_ = { \
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major, \
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minor, \
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name, \
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(gchar *) description, \
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init, \
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version, \
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license, \
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PACKAGE, \
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package, \
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origin, \
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GST_PADDING_INIT \
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}; \
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_gst_plugin_register_static (&plugin_desc_); \
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}
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/**
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* GST_LICENSE_UNKNOWN:
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*
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* To be used in GST_PLUGIN_DEFINE or GST_PLUGIN_DEFINE_STATIC if usure about
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* the licence.
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*/
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#define GST_LICENSE_UNKNOWN "unknown"
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/* function for filters */
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/**
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* GstPluginFilter:
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* @plugin: the plugin to check
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* @user_data: the user_data that has been passed on e.g. gst_registry_plugin_filter()
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*
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* A function that can be used with e.g. gst_registry_plugin_filter()
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* to get a list of plugins that match certain criteria.
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*
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* Returns: TRUE for a positive match, FALSE otherwise
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*/
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typedef gboolean (*GstPluginFilter) (GstPlugin *plugin,
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gpointer user_data);
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GType gst_plugin_get_type (void);
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#ifndef GST_DISABLE_DEPRECATED
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void _gst_plugin_register_static (GstPluginDesc *desc);
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#endif
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gboolean gst_plugin_register_static (gint major_version,
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gint minor_version,
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const gchar *name,
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const gchar *description,
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GstPluginInitFunc init_func,
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const gchar *version,
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const gchar *license,
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const gchar *source,
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const gchar *package,
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const gchar *origin);
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gboolean gst_plugin_register_static_full (gint major_version,
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gint minor_version,
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const gchar *name,
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const gchar *description,
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GstPluginInitFullFunc init_full_func,
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const gchar *version,
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const gchar *license,
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const gchar *source,
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const gchar *package,
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const gchar *origin,
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gpointer user_data);
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G_CONST_RETURN gchar* gst_plugin_get_name (GstPlugin *plugin);
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G_CONST_RETURN gchar* gst_plugin_get_description (GstPlugin *plugin);
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G_CONST_RETURN gchar* gst_plugin_get_filename (GstPlugin *plugin);
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G_CONST_RETURN gchar* gst_plugin_get_version (GstPlugin *plugin);
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G_CONST_RETURN gchar* gst_plugin_get_license (GstPlugin *plugin);
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G_CONST_RETURN gchar* gst_plugin_get_source (GstPlugin *plugin);
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G_CONST_RETURN gchar* gst_plugin_get_package (GstPlugin *plugin);
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G_CONST_RETURN gchar* gst_plugin_get_origin (GstPlugin *plugin);
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G_CONST_RETURN GstStructure* gst_plugin_get_cache_data (GstPlugin * plugin);
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void gst_plugin_set_cache_data (GstPlugin * plugin, GstStructure *cache_data);
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GModule * gst_plugin_get_module (GstPlugin *plugin);
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gboolean gst_plugin_is_loaded (GstPlugin *plugin);
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gboolean gst_plugin_name_filter (GstPlugin *plugin, const gchar *name);
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GstPlugin * gst_plugin_load_file (const gchar *filename, GError** error);
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GstPlugin * gst_plugin_load (GstPlugin *plugin);
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GstPlugin * gst_plugin_load_by_name (const gchar *name);
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void gst_plugin_add_dependency (GstPlugin * plugin,
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const gchar ** env_vars,
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const gchar ** paths,
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const gchar ** names,
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GstPluginDependencyFlags flags);
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void gst_plugin_add_dependency_simple (GstPlugin * plugin,
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const gchar * env_vars,
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const gchar * paths,
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const gchar * names,
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GstPluginDependencyFlags flags);
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void gst_plugin_list_free (GList *list);
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G_END_DECLS
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#endif /* __GST_PLUGIN_H__ */
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