gstreamer/ges/ges-timeline-transition.c
2010-12-08 13:00:21 +01:00

231 lines
6.7 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: Transition from one clip to another in a
* #GESTimelineLayer
*
* Creates an object that mixes together the two underlying objects, A and B.
* The A object is assumed to have a higher prioirity (lower number) than the
* B object. At the transition in point, only A will be visible, and by the
* end only B will be visible.
*
* The shape of the video transition depends on the value of the "vtype"
* property. The default value is "crossfade". For audio, only "crossfade" is
* supported.
*
* #GESSimpleTimelineLayer will automatically manage the priorities of sources
* and transitions. If you use #GESTimelineTransitions in another type of
* #GESTimelineLayer, you will need to manage priorities yourself.
*/
#include "ges-internal.h"
#include "ges-timeline-transition.h"
#include "ges-track-video-transition.h"
#include "ges-track-audio-transition.h"
struct _GESTimelineTransitionPrivate
{
/* Dummy variable */
void *nothing;
};
enum
{
PROP_VTYPE = 5,
};
G_DEFINE_TYPE (GESTimelineTransition, ges_timeline_transition,
GES_TYPE_TIMELINE_OBJECT);
static GESTrackObject *ges_tl_transition_create_track_object (GESTimelineObject
* self, GESTrack * track);
static void
ges_timeline_transition_update_vtype_internal (GESTimelineObject * self,
GESVideoTransitionType value)
{
GList *tmp, *trackobjects;
GESTimelineTransition *trself = (GESTimelineTransition *) self;
trackobjects = ges_timeline_object_get_track_objects (self);
for (tmp = trackobjects; tmp; tmp = tmp->next) {
GESTrackVideoTransition *obj;
if (GES_IS_TRACK_VIDEO_TRANSITION (tmp->data)) {
obj = (GESTrackVideoTransition *) tmp->data;
if (!ges_track_video_transition_set_type (obj, value))
return;
}
g_object_unref (GES_TRACK_OBJECT (tmp->data));
}
g_list_free (trackobjects);
trself->vtype = value;
return;
}
static void
ges_timeline_transition_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec)
{
GESTimelineTransition *self = GES_TIMELINE_TRANSITION (object);
switch (property_id) {
case PROP_VTYPE:
g_value_set_enum (value, self->vtype);
break;
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)
{
GESTimelineObject *self = GES_TIMELINE_OBJECT (object);
switch (property_id) {
case PROP_VTYPE:
ges_timeline_transition_update_vtype_internal (self,
g_value_get_enum (value));
break;
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);
g_type_class_add_private (klass, sizeof (GESTimelineTransitionPrivate));
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;
/**
* GESTimelineTransition:vtype
*
* a #GESVideoTransitionType representing the wipe to use
*/
g_object_class_install_property (object_class, PROP_VTYPE,
g_param_spec_enum ("vtype", "VType",
"The SMPTE video wipe to use, or 0 for crossfade",
GES_VIDEO_TRANSITION_TYPE_TYPE, GES_VIDEO_TRANSITION_TYPE_CROSSFADE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
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->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_TIMELINE_TRANSITION, GESTimelineTransitionPrivate);
self->vtype = GES_VIDEO_TRANSITION_TYPE_NONE;
}
static GESTrackObject *
ges_tl_transition_create_track_object (GESTimelineObject * obj,
GESTrack * track)
{
GESTimelineTransition *transition = (GESTimelineTransition *) obj;
GESTrackObject *res;
GST_DEBUG ("Creating a GESTrackTransition");
if (track->type == GES_TRACK_TYPE_VIDEO) {
res = GES_TRACK_OBJECT (ges_track_video_transition_new ());
ges_track_video_transition_set_type ((GESTrackVideoTransition *) res,
transition->vtype);
}
else if (track->type == GES_TRACK_TYPE_AUDIO) {
res = GES_TRACK_OBJECT (ges_track_audio_transition_new ());
}
else {
GST_WARNING ("Transitions don't handle this track type");
return NULL;
}
return res;
}
/**
* ges_timeline_transition_new:
* @vtype: the type of transition to create
*
*/
GESTimelineTransition *
ges_timeline_transition_new (GESVideoTransitionType vtype)
{
return g_object_new (GES_TYPE_TIMELINE_TRANSITION, "vtype", (gint) vtype,
NULL);
}
/**
* ges_timeline_transition_new_for_nick:
* @nick: a string representing the type of transition to create
*/
GESTimelineTransition *
ges_timeline_transition_new_for_nick (gchar * nick)
{
GEnumValue *value;
GEnumClass *klass;
GESTimelineTransition *ret = NULL;
klass = G_ENUM_CLASS (g_type_class_ref (GES_VIDEO_TRANSITION_TYPE_TYPE));
if (!klass)
return NULL;
value = g_enum_get_value_by_nick (klass, nick);
if (value) {
ret = g_object_new (GES_TYPE_TIMELINE_TRANSITION, "vtype",
(gint) value->value, NULL);
}
g_type_class_unref (klass);
return ret;
}