gstreamer/ges/ges-timeline-transition.c
Brandon Lewis ff4443a9c6 ges/ges-timeline-transition.{c,h}: add convenience routine for creating
transitions
docs/libs/ges-sections.txt: add routine to documentation
2010-06-09 11:28:08 +02:00

147 lines
4 KiB
C

/* GStreamer Editing Services
* Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
* 2009 Nokia Corporation
*
* 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: ges-timeline-transition
* @short_description: Base Class for transitions in a #GESTimelineLayer
*/
#include "ges-internal.h"
#include "ges-timeline-transition.h"
#include "ges-track-transition.h"
G_DEFINE_TYPE (GESTimelineTransition, ges_timeline_transition,
GES_TYPE_TIMELINE_OBJECT);
static GESTrackObject *ges_tl_transition_create_track_object (GESTimelineObject
*, GESTrack *);
static void
ges_timeline_transition_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec)
{
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_timeline_transition_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_timeline_transition_dispose (GObject * object)
{
G_OBJECT_CLASS (ges_timeline_transition_parent_class)->dispose (object);
}
static void
ges_timeline_transition_finalize (GObject * object)
{
G_OBJECT_CLASS (ges_timeline_transition_parent_class)->finalize (object);
}
static void
ges_timeline_transition_class_init (GESTimelineTransitionClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GESTimelineObjectClass *timobj_class = GES_TIMELINE_OBJECT_CLASS (klass);
object_class->get_property = ges_timeline_transition_get_property;
object_class->set_property = ges_timeline_transition_set_property;
object_class->dispose = ges_timeline_transition_dispose;
object_class->finalize = ges_timeline_transition_finalize;
timobj_class->create_track_object = ges_tl_transition_create_track_object;
timobj_class->need_fill_track = FALSE;
}
static void
ges_timeline_transition_init (GESTimelineTransition * self)
{
self->vtype = NULL;
}
static GESTrackObject *
ges_tl_transition_create_track_object (GESTimelineObject * obj,
GESTrack * track)
{
GESTimelineTransition *transition = (GESTimelineTransition *) obj;
GESTrackObject *res;
GST_DEBUG ("Creating a GESTrackTransition");
res = GES_TRACK_OBJECT (ges_track_transition_new (transition->vtype));
return res;
}
GESTimelineTransition *
ges_timeline_transition_new (GEnumValue * vtype)
{
GESTimelineTransition *ret = g_object_new
(GES_TYPE_TIMELINE_TRANSITION, NULL);
ret->vtype = vtype;
return ret;
}
static GEnumClass *smpte_enum_class = NULL;
static
_ensure_smpte_enum_class ()
{
if (!smpte_enum_class) {
GstElement *element = gst_element_factory_make ("smpte", NULL);
GstElementClass *element_class = GST_ELEMENT_GET_CLASS (element);
GParamSpec *pspec =
g_object_class_find_property (G_OBJECT_CLASS (element_class), "type");
smpte_enum_class = G_ENUM_CLASS (g_type_class_ref (pspec->value_type));
}
}
GESTimelineTransition *
ges_timeline_transition_new_for_nick (char *nick)
{
_ensure_smpte_enum_class ();
if (!strcmp ("crossfade", nick)) {
return ges_timeline_transition_new (NULL);
}
GEnumValue *value = g_enum_get_value_by_nick (smpte_enum_class, nick);
if (!value) {
return NULL;
}
return ges_timeline_transition_new (value);
}