mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-08 21:28:45 +00:00
368 lines
9.7 KiB
C
368 lines
9.7 KiB
C
/* GStreamer
|
|
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
|
|
* 2000 Wim Taymans <wtay@chello.be>
|
|
*
|
|
* gstpluginfeature.c: Abstract base class for all plugin features
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/**
|
|
* SECTION:gstpluginfeature
|
|
* @short_description: Base class for contents of a GstPlugin
|
|
* @see_also: #GstPlugin
|
|
*
|
|
* This is a base class for anything that can be added to a #GstPlugin.
|
|
*/
|
|
|
|
#include "gst_private.h"
|
|
|
|
#include "gstpluginfeature.h"
|
|
#include "gstplugin.h"
|
|
#include "gstregistry.h"
|
|
#include "gstinfo.h"
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#define GST_CAT_DEFAULT GST_CAT_PLUGIN_LOADING
|
|
|
|
static void gst_plugin_feature_finalize (GObject * object);
|
|
|
|
/* static guint gst_plugin_feature_signals[LAST_SIGNAL] = { 0 }; */
|
|
|
|
G_DEFINE_ABSTRACT_TYPE (GstPluginFeature, gst_plugin_feature, GST_TYPE_OBJECT);
|
|
|
|
static void
|
|
gst_plugin_feature_class_init (GstPluginFeatureClass * klass)
|
|
{
|
|
G_OBJECT_CLASS (klass)->finalize = gst_plugin_feature_finalize;
|
|
}
|
|
|
|
static void
|
|
gst_plugin_feature_init (GstPluginFeature * feature)
|
|
{
|
|
/* do nothing, needed because of G_DEFINE_TYPE */
|
|
}
|
|
|
|
static void
|
|
gst_plugin_feature_finalize (GObject * object)
|
|
{
|
|
GstPluginFeature *feature = GST_PLUGIN_FEATURE_CAST (object);
|
|
|
|
GST_DEBUG ("finalizing feature %p: '%s'", feature, GST_OBJECT_NAME (feature));
|
|
|
|
if (feature->plugin != NULL) {
|
|
g_object_remove_weak_pointer ((GObject *) feature->plugin,
|
|
(gpointer *) & feature->plugin);
|
|
}
|
|
|
|
G_OBJECT_CLASS (gst_plugin_feature_parent_class)->finalize (object);
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_feature_load:
|
|
* @feature: (transfer none): the plugin feature to check
|
|
*
|
|
* Loads the plugin containing @feature if it's not already loaded. @feature is
|
|
* unaffected; use the return value instead.
|
|
*
|
|
* Normally this function is used like this:
|
|
* |[
|
|
* GstPluginFeature *loaded_feature;
|
|
*
|
|
* loaded_feature = gst_plugin_feature_load (feature);
|
|
* // presumably, we're no longer interested in the potentially-unloaded feature
|
|
* gst_object_unref (feature);
|
|
* feature = loaded_feature;
|
|
* ]|
|
|
*
|
|
* Returns: (transfer full): a reference to the loaded feature, or NULL on error
|
|
*/
|
|
GstPluginFeature *
|
|
gst_plugin_feature_load (GstPluginFeature * feature)
|
|
{
|
|
GstPlugin *plugin;
|
|
GstPluginFeature *real_feature;
|
|
|
|
g_return_val_if_fail (feature != NULL, FALSE);
|
|
g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE);
|
|
|
|
GST_DEBUG ("loading plugin for feature %p; '%s'", feature,
|
|
GST_OBJECT_NAME (feature));
|
|
if (feature->loaded)
|
|
return gst_object_ref (feature);
|
|
|
|
GST_DEBUG ("loading plugin %s", feature->plugin_name);
|
|
plugin = gst_plugin_load_by_name (feature->plugin_name);
|
|
if (!plugin)
|
|
goto load_failed;
|
|
|
|
GST_DEBUG ("loaded plugin %s", feature->plugin_name);
|
|
gst_object_unref (plugin);
|
|
|
|
real_feature =
|
|
gst_registry_lookup_feature (gst_registry_get_default (),
|
|
GST_OBJECT_NAME (feature));
|
|
|
|
if (real_feature == NULL)
|
|
goto disappeared;
|
|
else if (!real_feature->loaded)
|
|
goto not_found;
|
|
|
|
return real_feature;
|
|
|
|
/* ERRORS */
|
|
load_failed:
|
|
{
|
|
GST_WARNING ("Failed to load plugin containing feature '%s'.",
|
|
GST_OBJECT_NAME (feature));
|
|
return NULL;
|
|
}
|
|
disappeared:
|
|
{
|
|
GST_INFO
|
|
("Loaded plugin containing feature '%s', but feature disappeared.",
|
|
GST_OBJECT_NAME (feature));
|
|
return NULL;
|
|
}
|
|
not_found:
|
|
{
|
|
GST_INFO ("Tried to load plugin containing feature '%s', but feature was "
|
|
"not found.", GST_OBJECT_NAME (real_feature));
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_feature_set_rank:
|
|
* @feature: feature to rank
|
|
* @rank: rank value - higher number means more priority rank
|
|
*
|
|
* Specifies a rank for a plugin feature, so that autoplugging uses
|
|
* the most appropriate feature.
|
|
*/
|
|
void
|
|
gst_plugin_feature_set_rank (GstPluginFeature * feature, guint rank)
|
|
{
|
|
g_return_if_fail (feature != NULL);
|
|
g_return_if_fail (GST_IS_PLUGIN_FEATURE (feature));
|
|
|
|
feature->rank = rank;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_feature_get_rank:
|
|
* @feature: a feature
|
|
*
|
|
* Gets the rank of a plugin feature.
|
|
*
|
|
* Returns: The rank of the feature
|
|
*/
|
|
guint
|
|
gst_plugin_feature_get_rank (GstPluginFeature * feature)
|
|
{
|
|
g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), GST_RANK_NONE);
|
|
|
|
return feature->rank;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_feature_list_free:
|
|
* @list: (transfer full) (element-type Gst.PluginFeature): list
|
|
* of #GstPluginFeature
|
|
*
|
|
* Unrefs each member of @list, then frees the list.
|
|
*/
|
|
void
|
|
gst_plugin_feature_list_free (GList * list)
|
|
{
|
|
GList *g;
|
|
|
|
for (g = list; g; g = g->next) {
|
|
GstPluginFeature *feature = GST_PLUGIN_FEATURE_CAST (g->data);
|
|
|
|
gst_object_unref (feature);
|
|
}
|
|
g_list_free (list);
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_feature_list_copy:
|
|
* @list: (transfer none) (element-type Gst.PluginFeature): list
|
|
* of #GstPluginFeature
|
|
*
|
|
* Copies the list of features. Caller should call @gst_plugin_feature_list_free
|
|
* when done with the list.
|
|
*
|
|
* Returns: (transfer full) (element-type Gst.PluginFeature): a copy of @list,
|
|
* with each feature's reference count incremented.
|
|
*
|
|
* Since: 0.10.26
|
|
*/
|
|
GList *
|
|
gst_plugin_feature_list_copy (GList * list)
|
|
{
|
|
GList *new_list = NULL;
|
|
|
|
if (G_LIKELY (list)) {
|
|
GList *last;
|
|
|
|
new_list = g_list_alloc ();
|
|
new_list->data = g_object_ref ((GObject *) list->data);
|
|
new_list->prev = NULL;
|
|
last = new_list;
|
|
list = list->next;
|
|
while (list) {
|
|
last->next = g_list_alloc ();
|
|
last->next->prev = last;
|
|
last = last->next;
|
|
last->data = g_object_ref ((GObject *) list->data);
|
|
list = list->next;
|
|
}
|
|
last->next = NULL;
|
|
}
|
|
|
|
return new_list;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_feature_list_debug:
|
|
* @list: (transfer none) (element-type Gst.PluginFeature): a #GList of
|
|
* plugin features
|
|
*
|
|
* Debug the plugin feature names in @list.
|
|
*
|
|
* Since: 0.10.31
|
|
*/
|
|
void
|
|
gst_plugin_feature_list_debug (GList * list)
|
|
{
|
|
#ifndef GST_DISABLE_GST_DEBUG
|
|
while (list) {
|
|
GST_DEBUG ("%s",
|
|
gst_plugin_feature_get_name ((GstPluginFeature *) list->data));
|
|
list = list->next;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_feature_check_version:
|
|
* @feature: a feature
|
|
* @min_major: minimum required major version
|
|
* @min_minor: minimum required minor version
|
|
* @min_micro: minimum required micro version
|
|
*
|
|
* Checks whether the given plugin feature is at least
|
|
* the required version
|
|
*
|
|
* Returns: #TRUE if the plugin feature has at least
|
|
* the required version, otherwise #FALSE.
|
|
*/
|
|
gboolean
|
|
gst_plugin_feature_check_version (GstPluginFeature * feature,
|
|
guint min_major, guint min_minor, guint min_micro)
|
|
{
|
|
GstRegistry *registry;
|
|
GstPlugin *plugin;
|
|
gboolean ret = FALSE;
|
|
|
|
g_return_val_if_fail (feature != NULL, FALSE);
|
|
g_return_val_if_fail (GST_IS_PLUGIN_FEATURE (feature), FALSE);
|
|
|
|
GST_DEBUG ("Looking up plugin '%s' containing plugin feature '%s'",
|
|
feature->plugin_name, GST_OBJECT_NAME (feature));
|
|
|
|
registry = gst_registry_get_default ();
|
|
plugin = gst_registry_find_plugin (registry, feature->plugin_name);
|
|
|
|
if (plugin) {
|
|
const gchar *ver_str;
|
|
guint major, minor, micro, nano;
|
|
gint nscan;
|
|
|
|
ver_str = gst_plugin_get_version (plugin);
|
|
g_return_val_if_fail (ver_str != NULL, FALSE);
|
|
|
|
nscan = sscanf (ver_str, "%u.%u.%u.%u", &major, &minor, µ, &nano);
|
|
GST_DEBUG ("version string '%s' parsed to %d values", ver_str, nscan);
|
|
|
|
if (nscan >= 3) {
|
|
if (major > min_major)
|
|
ret = TRUE;
|
|
else if (major < min_major)
|
|
ret = FALSE;
|
|
else if (minor > min_minor)
|
|
ret = TRUE;
|
|
else if (minor < min_minor)
|
|
ret = FALSE;
|
|
else if (micro > min_micro)
|
|
ret = TRUE;
|
|
/* micro is 1 smaller but we have a nano version, this is the upcoming
|
|
* release of the requested version and we're ok then */
|
|
else if (nscan == 4 && nano > 0 && (micro + 1 == min_micro))
|
|
ret = TRUE;
|
|
else
|
|
ret = (micro == min_micro);
|
|
|
|
GST_DEBUG ("Checking whether %u.%u.%u >= %u.%u.%u? %s", major, minor,
|
|
micro, min_major, min_minor, min_micro, (ret) ? "yes" : "no");
|
|
} else {
|
|
GST_WARNING ("Could not parse version string '%s' of plugin '%s'",
|
|
ver_str, feature->plugin_name);
|
|
}
|
|
|
|
gst_object_unref (plugin);
|
|
} else {
|
|
GST_DEBUG ("Could not find plugin '%s'", feature->plugin_name);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_plugin_feature_rank_compare_func:
|
|
* @p1: a #GstPluginFeature
|
|
* @p2: a #GstPluginFeature
|
|
*
|
|
* Compares the two given #GstPluginFeature instances. This function can be
|
|
* used as a #GCompareFunc when sorting by rank and then by name.
|
|
*
|
|
* Returns: negative value if the rank of p1 > the rank of p2 or the ranks are
|
|
* equal but the name of p1 comes before the name of p2; zero if the rank
|
|
* and names are equal; positive value if the rank of p1 < the rank of p2 or the
|
|
* ranks are equal but the name of p2 comes after the name of p1
|
|
*
|
|
* Since: 0.10.31
|
|
*/
|
|
gint
|
|
gst_plugin_feature_rank_compare_func (gconstpointer p1, gconstpointer p2)
|
|
{
|
|
GstPluginFeature *f1, *f2;
|
|
gint diff;
|
|
|
|
f1 = (GstPluginFeature *) p1;
|
|
f2 = (GstPluginFeature *) p2;
|
|
|
|
diff = f2->rank - f1->rank;
|
|
if (diff != 0)
|
|
return diff;
|
|
|
|
diff = strcmp (GST_OBJECT_NAME (f2), GST_OBJECT_NAME (f1));
|
|
|
|
return diff;
|
|
}
|