gstreamer/ges/ges-timeline-layer.c

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/* GStreamer Editing Services
* Copyright (C) 2009 Edward Hervey <bilboed@bilboed.com>
*
* 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-layer
* @short_description: Non-overlaping sequence of #GESTimelineObject
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*
* Responsible for the ordering of the various contained TimelineObject(s)
*/
#include "ges-internal.h"
#include "gesmarshal.h"
#include "ges-timeline-layer.h"
#include "ges.h"
G_DEFINE_TYPE (GESTimelineLayer, ges_timeline_layer, G_TYPE_OBJECT);
enum
{
OBJECT_ADDED,
OBJECT_REMOVED,
LAST_SIGNAL
};
static guint ges_timeline_layer_signals[LAST_SIGNAL] = { 0 };
static void
ges_timeline_layer_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
switch (property_id) {
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default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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}
}
static void
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ges_timeline_layer_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
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{
switch (property_id) {
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default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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}
}
static void
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ges_timeline_layer_dispose (GObject * object)
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{
GESTimelineLayer *layer = GES_TIMELINE_LAYER (object);
if (layer->objects_start) {
g_slist_foreach (layer->objects_start, (GFunc) g_object_unref, NULL);
g_slist_free (layer->objects_start);
layer->objects_start = NULL;
}
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G_OBJECT_CLASS (ges_timeline_layer_parent_class)->dispose (object);
}
static void
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ges_timeline_layer_finalize (GObject * object)
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{
G_OBJECT_CLASS (ges_timeline_layer_parent_class)->finalize (object);
}
static void
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ges_timeline_layer_class_init (GESTimelineLayerClass * klass)
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{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->get_property = ges_timeline_layer_get_property;
object_class->set_property = ges_timeline_layer_set_property;
object_class->dispose = ges_timeline_layer_dispose;
object_class->finalize = ges_timeline_layer_finalize;
ges_timeline_layer_signals[OBJECT_ADDED] =
g_signal_new ("object-added", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GESTimelineLayerClass, object_added),
NULL, NULL, ges_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
GES_TYPE_TIMELINE_OBJECT);
ges_timeline_layer_signals[OBJECT_REMOVED] =
g_signal_new ("object-removed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GESTimelineLayerClass,
object_removed), NULL, NULL, ges_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
GES_TYPE_TIMELINE_OBJECT);
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}
static void
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ges_timeline_layer_init (GESTimelineLayer * self)
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{
}
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GESTimelineLayer *
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ges_timeline_layer_new (void)
{
return g_object_new (GES_TYPE_TIMELINE_LAYER, NULL);
}
void
ges_timeline_layer_set_timeline (GESTimelineLayer * layer,
GESTimeline * timeline)
{
GST_DEBUG ("layer:%p, timeline:%p", layer, timeline);
layer->timeline = timeline;
}
static gint
objects_start_compare (GESTimelineObject * a, GESTimelineObject * b)
{
if (a->start == b->start) {
if (a->priority < b->priority)
return -1;
if (a->priority > b->priority)
return 1;
return 0;
}
if (a->start < b->start)
return -1;
if (a->start > b->start)
return 1;
return 0;
}
/**
* ges_timeline_layer_add_object:
* @layer: a #GESTimelineLayer
* @object: the #GESTimelineObject to add.
*
* Adds the object to the layer. The layer will steal a reference to the
* provided object.
*
* Returns: TRUE if the object was properly added to the layer, or FALSE
* if the @layer refused to add the object.
*/
gboolean
ges_timeline_layer_add_object (GESTimelineLayer * layer,
GESTimelineObject * object)
{
GST_DEBUG ("layer:%p, object:%p", layer, object);
if (G_UNLIKELY (object->layer)) {
GST_WARNING ("TimelineObject %p already belongs to another layer");
return FALSE;
}
/* Take a reference to the object and store it stored by start/priority */
layer->objects_start =
g_slist_insert_sorted (layer->objects_start, object,
(GCompareFunc) objects_start_compare);
/* Inform the object it's now in this layer */
ges_timeline_object_set_layer (object, layer);
/* emit 'object-added' */
g_signal_emit (layer, ges_timeline_layer_signals[OBJECT_ADDED], 0, object);
return TRUE;
}
/**
* ges_timeline_layer_remove_object:
* @layer: a #GESTimelineLayer
* @object: the #GESTimelineObject to remove
*
* Removes the given @object from the @layer. The reference stolen by the @layer
* when the object was added will be removed. If you wish to use the object after
* this function, make sure you take an extra reference to the object before
* calling this function.
*
* Returns: TRUE if the object was properly remove, else FALSE.
*/
gboolean
ges_timeline_layer_remove_object (GESTimelineLayer * layer,
GESTimelineObject * object)
{
GST_DEBUG ("layer:%p, object:%p", layer, object);
if (G_UNLIKELY (object->layer != layer)) {
GST_WARNING ("TimelineObject doesn't belong to this layer");
return FALSE;
}
/* emit 'object-removed' */
g_signal_emit (layer, ges_timeline_layer_signals[OBJECT_REMOVED], 0, object);
/* inform the object it's no longer in a layer */
ges_timeline_object_set_layer (object, NULL);
/* Remove it from our list of controlled objects */
layer->objects_start = g_slist_remove (layer->objects_start, object);
/* Remove our reference to the object */
g_object_unref (object);
return TRUE;
}