gstreamer/ges/ges-simple-timeline-layer.c
Edward Hervey ef7eb9efdd GESTransition: Make it a base class and add GESTimelineStandardTransition
This is to ensure people can create their own Layer Transition subclass.

API : GESTimelineTransition is now GESTimelineStandardTransition
2010-12-09 17:09:11 +01:00

489 lines
14 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-simple-timeline-layer
* @short_description: High-level #GESTimelineLayer
*
* #GESSimpleTimelineLayer allows using #GESTimelineObject(s) with a list-like
* API. Clients can add any type of GESTimelineObject to a
* GESSimpleTimelineLayer, and the layer will automatically compute the
* appropriate start times.
*
* Users should be aware that GESTimelineTransition objects are considered to
* have a negative duration for the purposes of positioning GESTimelineSource
* objects (i.e., adding a GESTimelineTransition creates an overlap between
* the two adjacent sources.
*/
#include <ges/ges.h>
#include "ges-internal.h"
#include "gesmarshal.h"
static void
ges_simple_timeline_layer_object_removed (GESTimelineLayer * layer,
GESTimelineObject * object);
static void
ges_simple_timeline_layer_object_added (GESTimelineLayer * layer,
GESTimelineObject * object);
static void
timeline_object_height_changed_cb (GESTimelineObject * object G_GNUC_UNUSED,
GParamSpec * arg G_GNUC_UNUSED, GESSimpleTimelineLayer * layer);
static GList *get_objects (GESTimelineLayer * layer);
G_DEFINE_TYPE (GESSimpleTimelineLayer, ges_simple_timeline_layer,
GES_TYPE_TIMELINE_LAYER);
struct _GESSimpleTimelineLayerPrivate
{
/* Sorted list of objects */
GList *objects;
gboolean adding_object;
gboolean valid;
};
enum
{
OBJECT_MOVED,
LAST_SIGNAL,
};
enum
{
PROP_0,
PROP_VALID,
LAST_PROP,
};
static guint gstl_signals[LAST_SIGNAL] = { 0 };
static void
ges_simple_timeline_layer_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec)
{
GESSimpleTimelineLayer *self;
self = GES_SIMPLE_TIMELINE_LAYER (object);
switch (property_id) {
case PROP_VALID:
g_value_set_boolean (value, self->priv->valid);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
ges_simple_timeline_layer_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_simple_timeline_layer_class_init (GESSimpleTimelineLayerClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GESTimelineLayerClass *layer_class = GES_TIMELINE_LAYER_CLASS (klass);
g_type_class_add_private (klass, sizeof (GESSimpleTimelineLayerPrivate));
object_class->get_property = ges_simple_timeline_layer_get_property;
object_class->set_property = ges_simple_timeline_layer_set_property;
/* Be informed when objects are being added/removed from elsewhere */
layer_class->object_removed = ges_simple_timeline_layer_object_removed;
layer_class->object_added = ges_simple_timeline_layer_object_added;
layer_class->get_objects = get_objects;
/**
* GESSimpleTimelineLayer:valid:
*
* FALSE when the arrangement of objects in the layer would cause errors or
* unexpected output during playback. Do not set the containing pipeline
* state to PLAYING when this property is FALSE.
*/
g_object_class_install_property (object_class, PROP_VALID,
g_param_spec_boolean ("valid", "Valid",
"Layer is in a valid configuration", FALSE, G_PARAM_READABLE));
/**
* GESSimpleTimelineLayer::object-moved
* @layer: the #GESSimpleTimelineLayer
* @object: the #GESTimelineObject that was added
* @old: the previous position of the object
* @new: the new position of the object
*
* Will be emitted when an object is moved with
* #ges_simple_timeline_layer_move_object.
*/
gstl_signals[OBJECT_MOVED] =
g_signal_new ("object-moved", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GESSimpleTimelineLayerClass,
object_moved),
NULL, NULL,
ges_marshal_VOID__OBJECT_INT_INT, G_TYPE_NONE, 3,
GES_TYPE_TIMELINE_OBJECT, G_TYPE_INT, G_TYPE_INT);
}
static void
ges_simple_timeline_layer_init (GESSimpleTimelineLayer * self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_SIMPLE_TIMELINE_LAYER, GESSimpleTimelineLayerPrivate);
self->priv->objects = NULL;
}
static void
gstl_recalculate (GESSimpleTimelineLayer * self)
{
GList *tmp;
GstClockTime pos = 0;
gint priority = 0;
gint transition_priority = 0;
gint height;
GESTimelineObject *prev_object = NULL;
GESTimelineObject *prev_transition = NULL;
gboolean valid = TRUE;
GESSimpleTimelineLayerPrivate *priv = self->priv;
priority = GES_TIMELINE_LAYER (self)->min_gnl_priority + 2;
GST_DEBUG ("recalculating values");
if (priv->objects && GES_IS_TIMELINE_TRANSITION (priv->objects->data)) {
valid = FALSE;
}
for (tmp = priv->objects; tmp; tmp = tmp->next) {
GESTimelineObject *obj;
guint64 dur;
GList *l_next;
obj = (GESTimelineObject *) tmp->data;
dur = GES_TIMELINE_OBJECT_DURATION (obj);
height = GES_TIMELINE_OBJECT_HEIGHT (obj);
if (GES_IS_TIMELINE_SOURCE (obj)) {
GST_LOG ("%p obj: height: %d: priority %d", obj, height, priority);
if (G_UNLIKELY (GES_TIMELINE_OBJECT_START (obj) != pos)) {
ges_timeline_object_set_start (obj, pos);
}
if (G_UNLIKELY (GES_TIMELINE_OBJECT_PRIORITY (obj) != priority)) {
ges_timeline_object_set_priority (obj, priority);
}
transition_priority = MAX (0, priority - 1);
priority += height;
pos += dur;
g_assert (priority != -1);
} else if (GES_IS_TIMELINE_TRANSITION (obj)) {
pos -= dur;
GST_LOG ("%p obj: height: %d: trans_priority %d", obj, height,
transition_priority);
g_assert (transition_priority != -1);
if (G_UNLIKELY (GES_TIMELINE_OBJECT_START (obj) != pos))
ges_timeline_object_set_start (obj, pos);
if (G_UNLIKELY (GES_TIMELINE_OBJECT_PRIORITY (obj) !=
transition_priority)) {
ges_timeline_object_set_priority (obj, transition_priority);
}
/* sanity checks */
l_next = g_list_next (tmp);
if (GES_IS_TIMELINE_TRANSITION (prev_object)) {
GST_ERROR ("two transitions in sequence!");
valid = FALSE;
}
if (prev_object && (GES_TIMELINE_OBJECT_DURATION (prev_object) < dur)) {
GST_ERROR ("transition duration exceeds that of previous neighbor!");
valid = FALSE;
}
if (l_next && (GES_TIMELINE_OBJECT_DURATION (l_next->data) < dur)) {
GST_ERROR ("transition duration exceeds that of next neighbor!");
valid = FALSE;
}
if (prev_transition) {
guint64 start, end;
end = (GES_TIMELINE_OBJECT_DURATION (prev_transition) +
GES_TIMELINE_OBJECT_START (prev_transition));
start = pos;
if (end > start) {
GST_ERROR ("%d, %d: overlapping transitions!", start, end);
valid = FALSE;
}
}
prev_transition = obj;
}
prev_object = obj;
}
if (prev_object && GES_IS_TIMELINE_TRANSITION (prev_object)) {
valid = FALSE;
}
GST_DEBUG ("Finished recalculating: final start pos is: " GST_TIME_FORMAT,
GST_TIME_ARGS (pos));
GES_TIMELINE_LAYER (self)->max_gnl_priority = priority;
if (valid != self->priv->valid) {
self->priv->valid = valid;
g_object_notify (G_OBJECT (self), "valid");
}
}
/**
* ges_simple_timeline_layer_add_object:
* @layer: a #GESSimpleTimelineLayer
* @object: the #GESTimelineObject to add
* @position: the position at which to add the object
*
* Adds the object at the given position in the layer. The position is where
* the object will be inserted. To put the object before all objects, use
* position 0. To put after all objects, use position -1.
*
* When adding transitions, it is important that the adjacent objects
* (objects at position, and position + 1) be (1) A derivative of
* GESTimelineSource or other non-transition, and (2) have a duration at least
* as long as the duration of the transition.
*
* The layer will steal a reference to the provided object.
*
* Returns: TRUE if the object was successfuly added, else FALSE.
*/
gboolean
ges_simple_timeline_layer_add_object (GESSimpleTimelineLayer * layer,
GESTimelineObject * object, gint position)
{
gboolean res;
GList *nth;
GESSimpleTimelineLayerPrivate *priv = layer->priv;
GST_DEBUG ("layer:%p, object:%p, position:%d", layer, object, position);
nth = g_list_nth (priv->objects, position);
if (GES_IS_TIMELINE_TRANSITION (object)) {
GList *lprev = g_list_previous (nth);
GESTimelineObject *prev = GES_TIMELINE_OBJECT (lprev ? lprev->data : NULL);
GESTimelineObject *next = GES_TIMELINE_OBJECT (nth ? nth->data : NULL);
if ((prev && GES_IS_TIMELINE_TRANSITION (prev)) ||
(next && GES_IS_TIMELINE_TRANSITION (next))) {
GST_ERROR ("Not adding transition: Only insert transitions between two"
" sources, or at the begining or end the layer\n");
return FALSE;
}
}
priv->adding_object = TRUE;
res = ges_timeline_layer_add_object ((GESTimelineLayer *) layer, object);
/* Add to layer */
if (G_UNLIKELY (!res)) {
priv->adding_object = FALSE;
return FALSE;
}
priv->adding_object = FALSE;
GST_DEBUG ("Adding object %p to the list", object);
priv->objects = g_list_insert (priv->objects, object, position);
g_signal_connect (G_OBJECT (object), "notify::height", G_CALLBACK
(timeline_object_height_changed_cb), layer);
/* recalculate positions */
gstl_recalculate (layer);
return TRUE;
}
/**
* ges_simple_timeline_layer_move_object:
* @layer: a #GESSimpleTimelineLayer
* @object: the #GESTimelineObject to move
* @newposition: the new position at which to move the object
*
* Moves the object to the given position in the layer. To put the object before
* all other objects, use position 0. To put the objects after all objects, use
* position -1.
*
* Returns: TRUE if the object was successfuly moved, else FALSE.
*/
gboolean
ges_simple_timeline_layer_move_object (GESSimpleTimelineLayer * layer,
GESTimelineObject * object, gint newposition)
{
gint idx;
GESSimpleTimelineLayerPrivate *priv = layer->priv;
GESTimelineLayer *tl_obj_layer;
GST_DEBUG ("layer:%p, object:%p, newposition:%d", layer, object, newposition);
tl_obj_layer = ges_timeline_object_get_layer (object);
if (G_UNLIKELY (tl_obj_layer != (GESTimelineLayer *) layer)) {
GST_WARNING ("TimelineObject doesn't belong to this layer");
if (tl_obj_layer != NULL)
g_object_unref (tl_obj_layer);
return FALSE;
}
if (tl_obj_layer != NULL)
g_object_unref (tl_obj_layer);
/* Find it's current position */
idx = g_list_index (priv->objects, object);
if (G_UNLIKELY (idx == -1)) {
GST_WARNING ("TimelineObject not controlled by this layer");
return FALSE;
}
GST_DEBUG ("Object was previously at position %d", idx);
/* If we don't have to change its position, don't */
if (idx == newposition)
return TRUE;
/* pop it off the list */
priv->objects = g_list_remove (priv->objects, object);
/* re-add it at the proper position */
priv->objects = g_list_insert (priv->objects, object, newposition);
/* recalculate positions */
gstl_recalculate (layer);
g_signal_emit (layer, gstl_signals[OBJECT_MOVED], 0, object, idx,
newposition);
return TRUE;
}
/**
* ges_simple_timeline_layer_new:
*
* Creates a new #GESSimpleTimelineLayer.
*
* Returns: The new #GESSimpleTimelineLayer
*/
GESSimpleTimelineLayer *
ges_simple_timeline_layer_new (void)
{
return g_object_new (GES_TYPE_SIMPLE_TIMELINE_LAYER, NULL);
}
/**
* ges_simple_timeline_layer_is_valid:
* @layer: a #GESSimpleTimelineLayer
*
* Checks whether the arrangement of objects in the layer would cause errors
* or unexpected output during playback. Do not set the containing pipeline
* state to PLAYING when this property is FALSE.
*
* Returns: #TRUE if current arrangement of the layer is valid else #FALSE.
*/
gboolean
ges_simple_timeline_layer_is_valid (GESSimpleTimelineLayer * layer)
{
return layer->priv->valid;
}
static void
ges_simple_timeline_layer_object_removed (GESTimelineLayer * layer,
GESTimelineObject * object)
{
GESSimpleTimelineLayer *sl = (GESSimpleTimelineLayer *) layer;
/* remove object from our list */
sl->priv->objects = g_list_remove (sl->priv->objects, object);
gstl_recalculate (sl);
}
static void
ges_simple_timeline_layer_object_added (GESTimelineLayer * layer,
GESTimelineObject * object)
{
GESSimpleTimelineLayer *sl = (GESSimpleTimelineLayer *) layer;
if (sl->priv->adding_object == FALSE) {
/* remove object from our list */
sl->priv->objects = g_list_append (sl->priv->objects, object);
gstl_recalculate (sl);
}
g_signal_connect_swapped (object, "notify::duration",
G_CALLBACK (gstl_recalculate), layer);
}
static void
timeline_object_height_changed_cb (GESTimelineObject * object,
GParamSpec * arg G_GNUC_UNUSED, GESSimpleTimelineLayer * layer)
{
GST_LOG ("layer %p: notify height changed %p", layer, object);
gstl_recalculate (layer);
}
static GList *
get_objects (GESTimelineLayer * l)
{
GList *ret;
GList *tmp;
GESSimpleTimelineLayer *layer = (GESSimpleTimelineLayer *) l;
ret = g_list_copy (layer->priv->objects);
for (tmp = ret; tmp; tmp = tmp->next) {
g_object_ref (tmp->data);
}
return ret;
}