gstreamer/ges/ges-timeline-object.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-object
* @short_description: Base Class for objects in a #GESTimelineLayer
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*
* A #GESTimelineObject is a 'natural' object which controls one or more
* #GESTrackObject(s) in one or more #GESTrack(s).
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*
* Keeps a reference to the #GESTrackObject(s) it created and
* sets/updates their properties.
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*/
#include "ges-timeline-object.h"
#include "ges.h"
#include "ges-internal.h"
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gboolean
ges_timeline_object_fill_track_object_func (GESTimelineObject * object,
GESTrackObject * trackobj, GstElement * gnlobj);
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gboolean
ges_timeline_object_create_track_objects_func (GESTimelineObject
* object, GESTrack * track);
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static void
track_object_start_changed_cb (GESTrackObject * child,
GParamSpec * arg G_GNUC_UNUSED, GESTimelineObject * object);
static void
track_object_inpoint_changed_cb (GESTrackObject * child,
GParamSpec * arg G_GNUC_UNUSED, GESTimelineObject * object);
static void
track_object_duration_changed_cb (GESTrackObject * child,
GParamSpec * arg G_GNUC_UNUSED, GESTimelineObject * object);
static void
track_object_priority_changed_cb (GESTrackObject * child,
GParamSpec * arg G_GNUC_UNUSED, GESTimelineObject * object);
G_DEFINE_ABSTRACT_TYPE (GESTimelineObject, ges_timeline_object,
G_TYPE_INITIALLY_UNOWNED);
/* Mapping of relationship between a TimelineObject and the TrackObjects
* it controls
*
* NOTE : how do we make this public in the future ?
*/
typedef struct
{
GESTrackObject *object;
gint64 start_offset;
gint64 duration_offset;
gint64 inpoint_offset;
gint32 priority_offset;
guint start_notifyid;
guint duration_notifyid;
guint inpoint_notifyid;
guint priority_notifyid;
/* track mapping ?? */
} ObjectMapping;
struct _GESTimelineObjectPrivate
{
/*< public > */
GESTimelineLayer *layer;
/*< private > */
/* A list of TrackObject controlled by this TimelineObject */
GList *trackobjects;
/* Set to TRUE when the timelineobject is doing updates of track object
* properties so we don't end up in infinite property update loops
*/
gboolean ignore_notifies;
GList *mappings;
};
enum
{
PROP_0,
PROP_START,
PROP_INPOINT,
PROP_DURATION,
PROP_PRIORITY,
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PROP_HEIGHT,
PROP_LAYER,
PROP_LAST
};
static GParamSpec *properties[PROP_LAST];
static void
ges_timeline_object_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
GESTimelineObject *tobj = GES_TIMELINE_OBJECT (object);
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switch (property_id) {
case PROP_START:
g_value_set_uint64 (value, tobj->start);
break;
case PROP_INPOINT:
g_value_set_uint64 (value, tobj->inpoint);
break;
case PROP_DURATION:
g_value_set_uint64 (value, tobj->duration);
break;
case PROP_PRIORITY:
g_value_set_uint (value, tobj->priority);
break;
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case PROP_HEIGHT:
g_value_set_uint (value, tobj->height);
break;
case PROP_LAYER:
g_value_set_object (value, tobj->priv->layer);
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_object_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
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{
GESTimelineObject *tobj = GES_TIMELINE_OBJECT (object);
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switch (property_id) {
case PROP_START:
ges_timeline_object_set_start (tobj, g_value_get_uint64 (value));
break;
case PROP_INPOINT:
ges_timeline_object_set_inpoint (tobj, g_value_get_uint64 (value));
break;
case PROP_DURATION:
ges_timeline_object_set_duration (tobj, g_value_get_uint64 (value));
break;
case PROP_PRIORITY:
ges_timeline_object_set_priority (tobj, 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_object_class_init (GESTimelineObjectClass * klass)
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{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GESTimelineObjectPrivate));
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object_class->get_property = ges_timeline_object_get_property;
object_class->set_property = ges_timeline_object_set_property;
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klass->create_track_objects = ges_timeline_object_create_track_objects_func;
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/**
* GESTimelineObject:start
*
* The position of the object in the #GESTimelineLayer (in nanoseconds).
*/
properties[PROP_START] = g_param_spec_uint64 ("start", "Start",
"The position in the container", 0, G_MAXUINT64, 0, G_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_START,
properties[PROP_START]);
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/**
* GESTimelineObject:in-point
*
* The in-point at which this #GESTimelineObject will start outputting data
* from its contents (in nanoseconds).
*
* Ex : an in-point of 5 seconds means that the first outputted buffer will
* be the one located 5 seconds in the controlled resource.
*/
properties[PROP_INPOINT] =
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g_param_spec_uint64 ("in-point", "In-point", "The in-point", 0,
G_MAXUINT64, 0, G_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_INPOINT,
properties[PROP_INPOINT]);
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/**
* GESTimelineObject:duration
*
* The duration (in nanoseconds) which will be used in the container #GESTrack
* starting from 'in-point'.
*/
properties[PROP_DURATION] =
g_param_spec_uint64 ("duration", "Duration", "The duration to use", 0,
G_MAXUINT64, GST_CLOCK_TIME_NONE, G_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_DURATION,
properties[PROP_DURATION]);
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/**
* GESTimelineObject:priority
*
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* The layer priority of the timeline object.
*/
properties[PROP_PRIORITY] = g_param_spec_uint ("priority", "Priority",
"The priority of the object", 0, G_MAXUINT, 0, G_PARAM_READWRITE);
g_object_class_install_property (object_class, PROP_PRIORITY,
properties[PROP_PRIORITY]);
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/**
* GESTimelineObject:height
*
* The span of layer priorities which this object occupies.
*/
g_object_class_install_property (object_class, PROP_HEIGHT,
g_param_spec_uint ("height", "Height",
"The span of priorities this object occupies", 0, G_MAXUINT, 1,
G_PARAM_READABLE));
/* GESSimpleTimelineLayer:layer
*
* The GESTimelineLayer where this object is being used.
*/
g_object_class_install_property (object_class, PROP_LAYER,
g_param_spec_object ("layer", "Layer",
"The GESTimelineLayer where this object is being used.",
GES_TYPE_TIMELINE_LAYER, G_PARAM_READABLE));
klass->need_fill_track = TRUE;
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}
static void
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ges_timeline_object_init (GESTimelineObject * self)
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{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self,
GES_TYPE_TIMELINE_OBJECT, GESTimelineObjectPrivate);
self->duration = GST_SECOND;
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self->height = 1;
self->priv->trackobjects = NULL;
self->priv->layer = NULL;
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}
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/**
* ges_timeline_object_create_track_object:
* @object: The origin #GESTimelineObject
* @track: The #GESTrack to create a #GESTrackObject for.
*
* Creates a #GESTrackObject for the provided @track. The timeline object
* keep a reference to the newly created trackobject, you therefore need to
* call @ges_timeline_object_release_track_object when you are done with it.
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*
* Returns: (transfer none): A #GESTrackObject. Returns NULL if the #GESTrackObject could not
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* be created.
*/
GESTrackObject *
ges_timeline_object_create_track_object (GESTimelineObject * object,
GESTrack * track)
{
GESTimelineObjectClass *class;
GESTrackObject *res;
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class = GES_TIMELINE_OBJECT_GET_CLASS (object);
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if (G_UNLIKELY (class->create_track_object == NULL)) {
GST_ERROR ("No 'create_track_object' implementation available");
return NULL;
}
res = class->create_track_object (object, track);
ges_timeline_object_add_track_object (object, res);
return res;
}
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/**
* ges_timeline_object_create_track_objects:
* @object: The origin #GESTimelineObject
* @track: The #GESTrack to create each #GESTrackObject for.
*
* Creates all #GESTrackObjects supported by this object and adds them to the
* provided track. The track is responsible for calling
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* #ges_timeline_release_track_object on these objects when it is finished
* with them.
*
* Returns: %TRUE if each track object was created successfully, or %FALSE if an
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* error occured.
*/
gboolean
ges_timeline_object_create_track_objects (GESTimelineObject * object,
GESTrack * track)
{
GESTimelineObjectClass *klass;
klass = GES_TIMELINE_OBJECT_GET_CLASS (object);
if (!(klass->create_track_objects)) {
GST_WARNING ("no GESTimelineObject::create_track_objects implentation");
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return FALSE;
}
return klass->create_track_objects (object, track);
}
/*
* default implementation of GESTimelineObjectClass::create_track_objects
*/
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gboolean
ges_timeline_object_create_track_objects_func (GESTimelineObject * object,
GESTrack * track)
{
GESTrackObject *result;
result = ges_timeline_object_create_track_object (object, track);
if (!result) {
GST_WARNING ("couldn't create track object");
return FALSE;
}
return ges_track_add_object (track, result);
}
/**
* ges_timeline_object_add_track_object:
* @object: a #GESTimelineObject
* @trobj: the GESTrackObject
*
* Add a track object to the timeline object. Should only be called by
* subclasses implementing the create_track_objects (plural) vmethod.
*
* Takes a reference on @trobj.
*
* Returns: %TRUE on success, %FALSE on failure.
*/
gboolean
ges_timeline_object_add_track_object (GESTimelineObject * object, GESTrackObject
* trobj)
{
ObjectMapping *mapping;
GST_LOG ("Got a TrackObject : %p , setting the timeline object as its"
"creator", trobj);
if (!trobj)
return FALSE;
ges_track_object_set_timeline_object (trobj, object);
g_object_ref (trobj);
mapping = g_slice_new0 (ObjectMapping);
mapping->object = trobj;
object->priv->mappings = g_list_append (object->priv->mappings, mapping);
GST_DEBUG ("Adding TrackObject to the list of controlled track objects");
/* We steal the initial reference */
object->priv->trackobjects =
g_list_append (object->priv->trackobjects, trobj);
GST_DEBUG ("Setting properties on newly created TrackObject");
ges_track_object_set_start (trobj, object->start);
ges_track_object_set_priority (trobj, object->priority);
ges_track_object_set_duration (trobj, object->duration);
ges_track_object_set_inpoint (trobj, object->inpoint);
GST_DEBUG ("Returning trobj:%p", trobj);
/* Listen to all property changes */
mapping->start_notifyid =
g_signal_connect (G_OBJECT (trobj), "notify::start",
G_CALLBACK (track_object_start_changed_cb), object);
mapping->duration_notifyid =
g_signal_connect (G_OBJECT (trobj), "notify::duration",
G_CALLBACK (track_object_duration_changed_cb), object);
mapping->inpoint_notifyid =
g_signal_connect (G_OBJECT (trobj), "notify::inpoint",
G_CALLBACK (track_object_inpoint_changed_cb), object);
mapping->priority_notifyid =
g_signal_connect (G_OBJECT (trobj), "notify::priority",
G_CALLBACK (track_object_priority_changed_cb), object);
return TRUE;
}
/**
* ges_timeline_object_release_track_object:
* @object: a #GESTimelineObject
* @trackobject: the #GESTrackObject to release
*
* Release the @trackobject from the control of @object.
*
* Returns: %TRUE if the @trackobject was properly released, else %FALSE.
*/
gboolean
ges_timeline_object_release_track_object (GESTimelineObject * object,
GESTrackObject * trackobject)
{
GList *tmp;
ObjectMapping *mapping = NULL;
GST_DEBUG ("object:%p, trackobject:%p", object, trackobject);
if (!(g_list_find (object->priv->trackobjects, trackobject))) {
GST_WARNING ("TrackObject isn't controlled by this object");
return FALSE;
}
/* FIXME : Do we need to tell the subclasses ?
* If so, add a new virtual-method */
for (tmp = object->priv->mappings; tmp; tmp = tmp->next) {
mapping = (ObjectMapping *) tmp->data;
if (mapping->object == trackobject)
break;
}
if (tmp && mapping) {
/* Disconnect all notify listeners */
g_signal_handler_disconnect (trackobject, mapping->start_notifyid);
g_signal_handler_disconnect (trackobject, mapping->duration_notifyid);
g_signal_handler_disconnect (trackobject, mapping->inpoint_notifyid);
g_signal_handler_disconnect (trackobject, mapping->priority_notifyid);
g_slice_free (ObjectMapping, mapping);
object->priv->mappings = g_list_delete_link (object->priv->mappings, tmp);
}
object->priv->trackobjects =
g_list_remove (object->priv->trackobjects, trackobject);
ges_track_object_set_timeline_object (trackobject, NULL);
GST_DEBUG ("Removing reference to track object %p", trackobject);
g_object_unref (trackobject);
/* FIXME : resync properties ? */
return TRUE;
}
void
ges_timeline_object_set_layer (GESTimelineObject * object,
GESTimelineLayer * layer)
{
GST_DEBUG ("object:%p, layer:%p", object, layer);
object->priv->layer = layer;
}
gboolean
ges_timeline_object_fill_track_object (GESTimelineObject * object,
GESTrackObject * trackobj, GstElement * gnlobj)
{
GESTimelineObjectClass *class;
gboolean res = TRUE;
GST_DEBUG ("object:%p, trackobject:%p, gnlobject:%p",
object, trackobj, gnlobj);
class = GES_TIMELINE_OBJECT_GET_CLASS (object);
if (class->need_fill_track) {
if (G_UNLIKELY (class->fill_track_object == NULL)) {
GST_WARNING ("No 'fill_track_object' implementation available");
return FALSE;
}
res = class->fill_track_object (object, trackobj, gnlobj);
}
GST_DEBUG ("Returning res:%d", res);
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return res;
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}
gboolean
ges_timeline_object_fill_track_object_func (GESTimelineObject * object,
GESTrackObject * trackobj, GstElement * gnlobj)
{
GST_WARNING ("No 'fill_track_object' implementation !");
return FALSE;
}
static ObjectMapping *
find_object_mapping (GESTimelineObject * object, GESTrackObject * child)
{
GList *tmp;
for (tmp = object->priv->mappings; tmp; tmp = tmp->next) {
ObjectMapping *map = (ObjectMapping *) tmp->data;
if (map->object == child)
return map;
}
return NULL;
}
/**
* ges_timeline_object_set_start:
* @object: a #GESTimelineObject
* @start: the position in #GstClockTime
*
* Set the position of the object in its containing layer
*/
void
ges_timeline_object_set_start (GESTimelineObject * object, guint64 start)
{
GList *tmp;
GESTrackObject *tr;
ObjectMapping *map;
GST_DEBUG ("object:%p, start:%" GST_TIME_FORMAT,
object, GST_TIME_ARGS (start));
object->priv->ignore_notifies = TRUE;
for (tmp = object->priv->trackobjects; tmp; tmp = g_list_next (tmp)) {
tr = (GESTrackObject *) tmp->data;
map = find_object_mapping (object, tr);
if (ges_track_object_is_locked (tr)) {
/* Move the child... */
ges_track_object_set_start (tr, start + map->start_offset);
} else {
/* ... or update the offset */
map->start_offset = start - tr->start;
}
}
object->priv->ignore_notifies = FALSE;
object->start = start;
}
/**
* ges_timeline_object_set_inpoint:
* @object: a #GESTimelineObject
* @inpoint: the in-point in #GstClockTime
*
* Set the in-point, that is the moment at which the @object will start
* outputting data from its contents.
*/
void
ges_timeline_object_set_inpoint (GESTimelineObject * object, guint64 inpoint)
{
GList *tmp;
GESTrackObject *tr;
GST_DEBUG ("object:%p, inpoint:%" GST_TIME_FORMAT,
object, GST_TIME_ARGS (inpoint));
for (tmp = object->priv->trackobjects; tmp; tmp = g_list_next (tmp)) {
tr = (GESTrackObject *) tmp->data;
if (ges_track_object_is_locked (tr))
/* call set_inpoint on each trackobject */
ges_track_object_set_inpoint (tr, inpoint);
}
object->inpoint = inpoint;
}
/**
* ges_timeline_object_set_duration:
* @object: a #GESTimelineObject
* @duration: the duration in #GstClockTime
*
* Set the duration of the object
*/
void
ges_timeline_object_set_duration (GESTimelineObject * object, guint64 duration)
{
GList *tmp;
GESTrackObject *tr;
GST_DEBUG ("object:%p, duration:%" GST_TIME_FORMAT,
object, GST_TIME_ARGS (duration));
for (tmp = object->priv->trackobjects; tmp; tmp = g_list_next (tmp)) {
tr = (GESTrackObject *) tmp->data;
if (ges_track_object_is_locked (tr))
/* call set_duration on each trackobject */
ges_track_object_set_duration (tr, duration);
}
object->duration = duration;
}
/**
* ges_timeline_object_set_priority:
* @object: a #GESTimelineObject
* @priority: the priority
*
* Sets the priority of the object within the containing layer
*/
void
ges_timeline_object_set_priority (GESTimelineObject * object, guint priority)
{
GList *tmp;
GESTrackObject *tr;
ObjectMapping *map;
GST_DEBUG ("object:%p, priority:%" GST_TIME_FORMAT,
object, GST_TIME_ARGS (priority));
object->priv->ignore_notifies = TRUE;
for (tmp = object->priv->trackobjects; tmp; tmp = g_list_next (tmp)) {
tr = (GESTrackObject *) tmp->data;
map = find_object_mapping (object, tr);
if (ges_track_object_is_locked (tr)) {
/* Move the child... */
ges_track_object_set_priority (tr, priority + map->priority_offset);
} else {
/* ... or update the offset */
map->priority_offset = priority - tr->priority;
}
}
object->priv->ignore_notifies = FALSE;
object->priority = priority;
}
/**
* ges_timeline_object_find_track_object:
* @object: a #GESTimelineObject
* @track: a #GESTrack or NULL
* @type: a #GType indicating the type of track object you are looking
* for or %G_TYPE_NONE if you do not care about the track type.
*
* Finds the #GESTrackObject controlled by @object that is used in @track. You
* may optionally specify a GType to further narrow search criteria.
*
* Note: The reference count of the returned #GESTrackObject will be increased,
* unref when done with it.
*
* Returns: (transfer full): The #GESTrackObject used by @track, else #NULL.
*/
GESTrackObject *
ges_timeline_object_find_track_object (GESTimelineObject * object,
GESTrack * track, GType type)
{
GESTrackObject *ret = NULL;
GList *tmp;
GESTrackObject *otmp;
for (tmp = object->priv->trackobjects; tmp; tmp = g_list_next (tmp)) {
otmp = (GESTrackObject *) tmp->data;
if (ges_track_object_get_track (otmp) == track) {
if ((type != G_TYPE_NONE) && !G_TYPE_CHECK_INSTANCE_TYPE (tmp->data,
type))
continue;
ret = GES_TRACK_OBJECT (tmp->data);
g_object_ref (ret);
break;
}
}
return ret;
}
/**
* ges_timeline_object_get_layer:
* @object: a #GESTimelineObject
*
* Note: The reference count of the returned #GESTimelineLayer will be increased,
* The user is responsible for unreffing it.
*
* Returns: (transfer full): The #GESTimelineLayer where this @object is being used, #NULL if
* it is not used on any layer.
*/
GESTimelineLayer *
ges_timeline_object_get_layer (GESTimelineObject * object)
{
g_return_val_if_fail (GES_IS_TIMELINE_OBJECT (object), NULL);
if (object->priv->layer != NULL)
g_object_ref (G_OBJECT (object->priv->layer));
return object->priv->layer;
}
/**
* ges_timeline_object_get_track_objects:
* @object: a #GESTimelineObject
*
* Get the list of #GESTrackObject contained in @object
*
* Returns: (transfer full) (element-type GESTrackObject): The list of
* trackobject contained in @object.
* The user is responsible for unreffing the contained objects
* and freeing the list.
*/
GList *
ges_timeline_object_get_track_objects (GESTimelineObject * object)
{
GList *ret;
GList *tmp;
g_return_val_if_fail (GES_IS_TIMELINE_OBJECT (object), NULL);
ret = g_list_copy (object->priv->trackobjects);
for (tmp = ret; tmp; tmp = tmp->next) {
g_object_ref (tmp->data);
}
return ret;
}
/*
* PROPERTY NOTIFICATIONS FROM TRACK OBJECTS
*/
static void
track_object_start_changed_cb (GESTrackObject * child,
GParamSpec * arg G_GNUC_UNUSED, GESTimelineObject * object)
{
ObjectMapping *map;
if (object->priv->ignore_notifies)
return;
map = find_object_mapping (object, child);
if (G_UNLIKELY (map == NULL))
/* something massively screwed up if we get this */
return;
if (!ges_track_object_is_locked (child)) {
/* Update the internal start_offset */
map->start_offset = object->start - child->start;
} else {
/* Or update the parent start */
ges_timeline_object_set_start (object, child->start + map->start_offset);
}
}
static void
track_object_inpoint_changed_cb (GESTrackObject * child,
GParamSpec * arg G_GNUC_UNUSED, GESTimelineObject * object)
{
if (object->priv->ignore_notifies)
return;
}
static void
track_object_duration_changed_cb (GESTrackObject * child,
GParamSpec * arg G_GNUC_UNUSED, GESTimelineObject * object)
{
if (object->priv->ignore_notifies)
return;
}
static void
track_object_priority_changed_cb (GESTrackObject * child,
GParamSpec * arg G_GNUC_UNUSED, GESTimelineObject * object)
{
ObjectMapping *map;
if (object->priv->ignore_notifies)
return;
map = find_object_mapping (object, child);
if (G_UNLIKELY (map == NULL))
/* something massively screwed up if we get this */
return;
if (!ges_track_object_is_locked (child)) {
GList *tmp;
guint32 min_prio = G_MAXUINT32, max_prio = 0;
/* Update the internal priority_offset */
map->priority_offset = object->priority - child->priority;
/* Go over all childs and check if height has changed */
for (tmp = object->priv->trackobjects; tmp; tmp = tmp->next) {
GESTrackObject *tmpo = (GESTrackObject *) tmp->data;
if (tmpo->priority < min_prio)
min_prio = tmpo->priority;
if (tmpo->priority > max_prio)
max_prio = tmpo->priority;
}
/* FIXME : We only grow the height */
if (object->height < (max_prio - min_prio + 1)) {
object->height = max_prio - min_prio + 1;
#if GLIB_CHECK_VERSION(2,26,0)
g_object_notify_by_pspec (G_OBJECT (object), properties[PROP_HEIGHT]);
#else
g_object_notify (G_OBJECT (object), "height");
#endif
}
} else {
/* Or update the parent priority */
ges_timeline_object_set_priority (object,
child->priority + map->priority_offset);
/* For the locked situation, we don't need to check the height,
* since all object priorities are moving together */
}
}