gstreamer/ges/ges-timeline-layer.c

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/* GStreamer Editing Services
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* Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
* 2009 Nokia Corporation
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*
* 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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*
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* 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.
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*/
#include "ges-internal.h"
#include "gesmarshal.h"
#include "ges-timeline-layer.h"
#include "ges.h"
#define LAYER_HEIGHT 10
G_DEFINE_TYPE (GESTimelineLayer, ges_timeline_layer, G_TYPE_INITIALLY_UNOWNED);
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struct _GESTimelineLayerPrivate
{
/*< private > */
GSList *objects_start; /* The TimelineObjects sorted by start and
* priority */
guint32 priority; /* The priority of the layer within the
* containing timeline */
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};
enum
{
PROP_0,
PROP_PRIORITY,
};
enum
{
OBJECT_ADDED,
OBJECT_REMOVED,
LAST_SIGNAL
};
static guint ges_timeline_layer_signals[LAST_SIGNAL] = { 0 };
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static gboolean ges_timeline_layer_resync_priorities (GESTimelineLayer * layer);
static void
ges_timeline_layer_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
GESTimelineLayer *layer = GES_TIMELINE_LAYER (object);
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switch (property_id) {
case PROP_PRIORITY:
g_value_set_uint (value, layer->priv->priority);
break;
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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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{
GESTimelineLayer *layer = GES_TIMELINE_LAYER (object);
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switch (property_id) {
case PROP_PRIORITY:
ges_timeline_layer_set_priority (layer, g_value_get_uint (value));
break;
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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);
GESTimelineLayerPrivate *priv = layer->priv;
GST_DEBUG ("Disposing layer");
while (priv->objects_start)
ges_timeline_layer_remove_object (layer,
(GESTimelineObject *) priv->objects_start->data);
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G_OBJECT_CLASS (ges_timeline_layer_parent_class)->dispose (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);
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g_type_class_add_private (klass, sizeof (GESTimelineLayerPrivate));
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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;
/**
* GESTimelineLayer:priority
*
* The priority of the layer in the #GESTimeline. 0 is the highest
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* 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));
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/**
* 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);
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/**
* 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);
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}
static void
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ges_timeline_layer_init (GESTimelineLayer * self)
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{
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self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_TIMELINE_LAYER, GESTimelineLayerPrivate);
self->priv->priority = 0;
self->min_gnl_priority = 0;
self->max_gnl_priority = 9;
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}
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/**
* ges_timeline_layer_new:
*
* Creates a new #GESTimelineLayer.
*
* Returns: A new #GESTimelineLayer
*/
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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: (transfer full): the #GESTimelineObject to add.
*
* Adds the given object to the layer. Sets the object's parent, and thus
* takes ownership of the object.
*
* An object can only be added to one layer.
*
* Returns: TRUE if the object was properly added to the layer, or FALSE
* if the @layer refuses to add the object.
*/
gboolean
ges_timeline_layer_add_object (GESTimelineLayer * layer,
GESTimelineObject * object)
{
GESTimelineLayer *tl_obj_layer;
guint32 maxprio, minprio, prio;
GST_DEBUG ("layer:%p, object:%p", layer, object);
tl_obj_layer = ges_timeline_object_get_layer (object);
if (G_UNLIKELY (tl_obj_layer)) {
GST_WARNING ("TimelineObject %p already belongs to another layer", object);
g_object_unref (tl_obj_layer);
return FALSE;
}
g_object_ref_sink (object);
/* Take a reference to the object and store it stored by start/priority */
layer->priv->objects_start =
g_slist_insert_sorted (layer->priv->objects_start, object,
(GCompareFunc) objects_start_compare);
/* Inform the object it's now in this layer */
ges_timeline_object_set_layer (object, layer);
GST_DEBUG ("current object priority : %d, layer min/max : %d/%d",
GES_TIMELINE_OBJECT_PRIORITY (object),
layer->min_gnl_priority, layer->max_gnl_priority);
/* Set the priority. */
maxprio = layer->max_gnl_priority;
minprio = layer->min_gnl_priority;
prio = GES_TIMELINE_OBJECT_PRIORITY (object);
if (minprio + prio > (maxprio)) {
GST_WARNING ("%p is out of the layer %p space, setting its priority to "
"setting its priority %d to the maximum priority of the layer %d",
object, layer, prio, maxprio - minprio);
ges_timeline_object_set_priority (object, LAYER_HEIGHT - 1);
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}
/* If the object has an acceptable priority, we just let it with its current
* priority */
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ges_timeline_layer_resync_priorities (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 and unparents it.
* Unparenting it means the reference owned by @layer on the @object will be
* removed. If you wish to use the @object after this function, make sure you
* call g_object_ref() before removing it from the @layer.
*
* Returns: TRUE if the object could be removed, FALSE if the layer does
* not want to remove the object.
*/
gboolean
ges_timeline_layer_remove_object (GESTimelineLayer * layer,
GESTimelineObject * object)
{
GESTimelineLayer *tl_obj_layer;
g_return_val_if_fail (GES_IS_TIMELINE_LAYER (layer), FALSE);
g_return_val_if_fail (GES_IS_TIMELINE_OBJECT (object), FALSE);
GST_DEBUG ("layer:%p, object:%p", layer, object);
tl_obj_layer = ges_timeline_object_get_layer (object);
if (G_UNLIKELY (tl_obj_layer != layer)) {
GST_WARNING ("TimelineObject doesn't belong to this layer");
if (tl_obj_layer != NULL)
g_object_unref (tl_obj_layer);
return FALSE;
}
g_object_unref (tl_obj_layer);
/* 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->priv->objects_start =
g_slist_remove (layer->priv->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;
GESTimelineObject *obj;
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GST_DEBUG ("Resync priorities of %p", layer);
/* 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. */
for (tmp = layer->priv->objects_start; tmp; tmp = tmp->next) {
obj = GES_TIMELINE_OBJECT (tmp->data);
ges_timeline_object_set_priority (obj, GES_TIMELINE_OBJECT_PRIORITY (obj));
}
return TRUE;
}
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/**
* 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.
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*/
void
ges_timeline_layer_set_priority (GESTimelineLayer * layer, guint priority)
{
g_return_if_fail (GES_IS_TIMELINE_LAYER (layer));
GST_DEBUG ("layer:%p, priority:%d", layer, priority);
if (priority != layer->priv->priority) {
layer->priv->priority = priority;
layer->min_gnl_priority = (priority * LAYER_HEIGHT);
layer->max_gnl_priority = ((priority + 1) * LAYER_HEIGHT) - 1;
ges_timeline_layer_resync_priorities (layer);
}
}
/**
* ges_timeline_layer_get_priority:
* @layer: a #GESTimelineLayer
*
* Get the priority of @layer within the timeline.
*
* Returns: The priority of the @layer within the timeline.
*/
guint
ges_timeline_layer_get_priority (GESTimelineLayer * layer)
{
g_return_val_if_fail (GES_IS_TIMELINE_LAYER (layer), 0);
return layer->priv->priority;
}
/**
* ges_timeline_layer_get_objects:
* @layer: a #GESTimelineLayer
*
* Get the timeline objects this layer contains.
*
* Returns: (transfer full) (element-type GESTimelineObject): a #GList of
* timeline objects. The user is responsible for
* unreffing the contained objects and freeing the list.
*/
GList *
ges_timeline_layer_get_objects (GESTimelineLayer * layer)
{
GList *ret = NULL;
GSList *tmp;
GESTimelineLayerClass *klass;
g_return_val_if_fail (GES_IS_TIMELINE_LAYER (layer), NULL);
klass = GES_TIMELINE_LAYER_GET_CLASS (layer);
if (klass->get_objects) {
return klass->get_objects (layer);
}
for (tmp = layer->priv->objects_start; tmp; tmp = tmp->next) {
ret = g_list_prepend (ret, tmp->data);
g_object_ref (tmp->data);
}
ret = g_list_reverse (ret);
return ret;
}