gstreamer/ges/ges-base-effect.c

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/* GStreamer Editing Services
* Copyright (C) 2010 Thibault Saunier <tsaunier@gnome.org>
*
* 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
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
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* SECTION:ges-base-effect
* @short_description: adds an effect to a stream in a GESSourceClip or a
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* #GESLayer
*/
#include <glib/gprintf.h>
#include <string.h>
#include "ges-internal.h"
#include "ges-track-element.h"
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#include "ges-base-effect.h"
G_DEFINE_ABSTRACT_TYPE (GESBaseEffect, ges_base_effect, GES_TYPE_OPERATION);
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static GHashTable *ges_base_effect_get_props_hashtable (GESTrackElement * self);
guint pspec_hash (gconstpointer key_spec);
static gboolean pspec_equal (gconstpointer key_spec_1,
gconstpointer key_spec_2);
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struct _GESBaseEffectPrivate
{
void *nothing;
};
static void
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ges_base_effect_class_init (GESBaseEffectClass * klass)
{
GESTrackElementClass *obj_bg_class = GES_TRACK_ELEMENT_CLASS (klass);
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g_type_class_add_private (klass, sizeof (GESBaseEffectPrivate));
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obj_bg_class->get_props_hastable = ges_base_effect_get_props_hashtable;
}
static void
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ges_base_effect_init (GESBaseEffect * self)
{
self->priv =
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G_TYPE_INSTANCE_GET_PRIVATE (self, GES_TYPE_BASE_EFFECT,
GESBaseEffectPrivate);
}
static gboolean
pspec_equal (gconstpointer key_spec_1, gconstpointer key_spec_2)
{
const GParamSpec *key1 = key_spec_1;
const GParamSpec *key2 = key_spec_2;
return (key1->owner_type == key2->owner_type &&
strcmp (key1->name, key2->name) == 0);
}
guint
pspec_hash (gconstpointer key_spec)
{
const GParamSpec *key = key_spec;
const gchar *p;
guint h = key->owner_type;
for (p = key->name; *p; p++)
h = (h << 5) - h + *p;
return h;
}
/* Virtual methods */
static GHashTable *
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ges_base_effect_get_props_hashtable (GESTrackElement * self)
{
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GValue item = { 0, };
GstIterator *it;
GParamSpec **parray;
GObjectClass *class;
const gchar *klass;
GstElementFactory *factory;
GstElement *element;
gboolean done = FALSE;
GHashTable *ret = NULL;
element = ges_track_element_get_element (self);
if (!element) {
GST_DEBUG
("Can't build the property hashtable until the gnlobject is created");
return NULL;
}
ret = g_hash_table_new_full ((GHashFunc) pspec_hash, pspec_equal,
(GDestroyNotify) g_param_spec_unref, gst_object_unref);
/* We go over child elements recursivly, and add writable properties to the
* hashtable
* FIXME: Add a blacklist of properties */
it = gst_bin_iterate_recurse (GST_BIN (element));
while (!done) {
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switch (gst_iterator_next (it, &item)) {
case GST_ITERATOR_OK:
{
gchar **categories;
guint category;
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GstElement *child = g_value_get_object (&item);
factory = gst_element_get_factory (child);
klass = gst_element_factory_get_metadata (factory,
GST_ELEMENT_METADATA_KLASS);
GST_DEBUG ("Looking at element '%s' of klass '%s'",
GST_ELEMENT_NAME (child), klass);
categories = g_strsplit (klass, "/", 0);
for (category = 0; categories[category]; category++) {
if (g_strcmp0 (categories[category], "Effect") == 0) {
guint i, nb_specs;
class = G_OBJECT_GET_CLASS (child);
parray = g_object_class_list_properties (class, &nb_specs);
for (i = 0; i < nb_specs; i++) {
if (parray[i]->flags & G_PARAM_WRITABLE) {
g_hash_table_insert (ret, g_param_spec_ref (parray[i]),
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gst_object_ref (child));
}
}
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g_free (parray);
GST_DEBUG
("%d configurable properties of '%s' added to property hashtable",
nb_specs, GST_ELEMENT_NAME (child));
break;
}
}
g_strfreev (categories);
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g_value_reset (&item);
break;
}
case GST_ITERATOR_RESYNC:
/* FIXME, properly restart the process */
GST_DEBUG ("iterator resync");
gst_iterator_resync (it);
break;
case GST_ITERATOR_DONE:
GST_DEBUG ("iterator done");
done = TRUE;
break;
default:
break;
}
}
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g_value_unset (&item);
gst_iterator_free (it);
return ret;
}