gstreamer/ges/ges-timeline-layer.c
2010-07-09 13:21:17 +02:00

335 lines
9.6 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-layer
* @short_description: Non-overlaping sequence of #GESTimelineObject
*
* Responsible for the ordering of the various contained TimelineObject(s). A
* timeline layer has a "priority" property, which is used to manage the
* priorities of individual TimelineObjects. Two layers should not have the
* same priority within a given timeline.
*/
#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
{
PROP_0,
PROP_PRIORITY,
};
enum
{
OBJECT_ADDED,
OBJECT_REMOVED,
LAST_SIGNAL
};
static guint ges_timeline_layer_signals[LAST_SIGNAL] = { 0 };
static gboolean ges_timeline_layer_resync_priorities (GESTimelineLayer * layer);
static void
ges_timeline_layer_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GESTimelineLayer *layer = GES_TIMELINE_LAYER (object);
switch (property_id) {
case PROP_PRIORITY:
g_value_set_uint (value, layer->priority);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_timeline_layer_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GESTimelineLayer *layer = GES_TIMELINE_LAYER (object);
switch (property_id) {
case PROP_PRIORITY:
ges_timeline_layer_set_priority (layer, g_value_get_uint (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_timeline_layer_dispose (GObject * object)
{
GESTimelineLayer *layer = GES_TIMELINE_LAYER (object);
GST_DEBUG ("Disposing layer");
while (layer->objects_start) {
GESTimelineObject *obj = (GESTimelineObject *) layer->objects_start->data;
ges_timeline_layer_remove_object (layer, obj);
}
G_OBJECT_CLASS (ges_timeline_layer_parent_class)->dispose (object);
}
static void
ges_timeline_layer_finalize (GObject * object)
{
G_OBJECT_CLASS (ges_timeline_layer_parent_class)->finalize (object);
}
static void
ges_timeline_layer_class_init (GESTimelineLayerClass * klass)
{
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;
/**
* GESTimelineLayer:priority
*
* The priority of the layer in the #GESTimeline. 0 is the highest
* priority. Conceptually, a #GESTimeline is a stack of GESTimelineLayers,
* and the priority of the layer represents its position in the stack. Two
* layers should not have the same priority within a given GESTimeline.
*/
g_object_class_install_property (object_class, PROP_PRIORITY,
g_param_spec_uint ("priority", "Priority",
"The priority of the layer", 0, G_MAXUINT, 0, G_PARAM_READWRITE));
/**
* GESTimelineLayer::object-added
* @layer: the #GESTimelineLayer
* @object: the #GESTimelineObject that was added.
*
* Will be emitted after the object was added to the layer.
*/
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);
/**
* GESTimelineLayer::object-removed
* @layer: the #GESTimelineLayer
* @object: the #GESTimelineObject that was removed
*
* Will be emitted after the object was removed from the layer.
*/
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);
}
static void
ges_timeline_layer_init (GESTimelineLayer * self)
{
/* TODO : Keep those 3 values in sync */
self->priority = 0;
self->min_gnl_priority = 0;
self->max_gnl_priority = 9;
}
/**
* ges_timeline_layer_new:
*
* Creates a new #GESTimelineLayer.
*
* Returns: A new #GESTimelineLayer
*/
GESTimelineLayer *
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);
/* Set the priority. */
if (GES_TIMELINE_OBJECT_PRIORITY (object) > (layer->max_gnl_priority)) {
ges_timeline_object_set_priority (object, layer->max_gnl_priority);
}
else if (GES_TIMELINE_OBJECT_PRIORITY (object) < (layer->min_gnl_priority)) {
ges_timeline_object_set_priority (object, layer->min_gnl_priority);
}
/* 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;
}
/**
* ges_timeline_layer_resync_priorities:
* @layer: a #GESTimelineLayer
*
* Resyncs the priorities of the objects controlled by @layer.
* This method */
gboolean
ges_timeline_layer_resync_priorities (GESTimelineLayer * layer)
{
GSList *tmp;
/* TODO : Inhibit composition updates while doing this.
* Ideally we want to do it from an even higher level, but here will
* do in the meantime. */
/* TODO : This is the dumb version where we put everything linearly,
* will need to be adjusted for more complex usages (like with
* transitions). */
for (tmp = layer->objects_start; tmp; tmp = tmp->next) {
ges_timeline_object_set_priority ((GESTimelineObject *) tmp->data,
layer->min_gnl_priority);
}
return TRUE;
}
/**
* ges_timeline_layer_set_priority:
* @layer: a #GESTimelineLayer
* @priority: the priority to set
*
* Sets the layer to the given @priority. See the documentation of
* the "priority" property for more information.
*/
void
ges_timeline_layer_set_priority (GESTimelineLayer * layer, guint priority)
{
GST_DEBUG ("layer:%p, priority:%d", layer, priority);
if (priority != layer->priority) {
layer->priority = priority;
layer->min_gnl_priority = (priority * 10);
layer->max_gnl_priority = ((priority + 1) * 10) - 1;
/* FIXME : Update controlled object's gnl priority accordingly */
ges_timeline_layer_resync_priorities (layer);
}
}