GESTimelineElement

GESTimelineElement — Base Class for all elements that will be in a way or another inside a GESTimeline.

Synopsis

#include <ges/ges.h>

                    GESTimelineElement;
                    GESTimelineElementClass;
gboolean            ges_timeline_element_set_parent     (GESTimelineElement *self,
                                                         GESTimelineElement *parent);
GESTimelineElement * ges_timeline_element_get_parent    (GESTimelineElement *self);
gboolean            ges_timeline_element_set_timeline   (GESTimelineElement *self,
                                                         GESTimeline *timeline);
GESTimeline *       ges_timeline_element_get_timeline   (GESTimelineElement *self);
void                ges_timeline_element_set_start      (GESTimelineElement *self,
                                                         GstClockTime start);
void                ges_timeline_element_set_inpoint    (GESTimelineElement *self,
                                                         GstClockTime inpoint);
void                ges_timeline_element_set_duration   (GESTimelineElement *self,
                                                         GstClockTime duration);
void                ges_timeline_element_set_max_duration
                                                        (GESTimelineElement *self,
                                                         GstClockTime maxduration);
void                ges_timeline_element_set_priority   (GESTimelineElement *self,
                                                         guint32 priority);
GstClockTime        ges_timeline_element_get_start      (GESTimelineElement *self);
GstClockTime        ges_timeline_element_get_inpoint    (GESTimelineElement *self);
GstClockTime        ges_timeline_element_get_duration   (GESTimelineElement *self);
GstClockTime        ges_timeline_element_get_max_duration
                                                        (GESTimelineElement *self);
guint32             ges_timeline_element_get_priority   (GESTimelineElement *self);
gboolean            ges_timeline_element_ripple         (GESTimelineElement *self,
                                                         GstClockTime start);
gboolean            ges_timeline_element_ripple_end     (GESTimelineElement *self,
                                                         GstClockTime end);
gboolean            ges_timeline_element_roll_start     (GESTimelineElement *self,
                                                         GstClockTime start);
gboolean            ges_timeline_element_roll_end       (GESTimelineElement *self,
                                                         GstClockTime end);
gboolean            ges_timeline_element_trim           (GESTimelineElement *self,
                                                         GstClockTime start);
GESTimelineElement * ges_timeline_element_get_toplevel_parent
                                                        (GESTimelineElement *self);
#define             GES_TIMELINE_ELEMENT_PARENT         (obj)
#define             GES_TIMELINE_ELEMENT_TIMELINE       (obj)
#define             GES_TIMELINE_ELEMENT_START          (obj)
#define             GES_TIMELINE_ELEMENT_END            (obj)
#define             GES_TIMELINE_ELEMENT_INPOINT        (obj)
#define             GES_TIMELINE_ELEMENT_DURATION       (obj)
#define             GES_TIMELINE_ELEMENT_MAX_DURATION   (obj)
#define             GES_TIMELINE_ELEMENT_PRIORITY       (obj)

Object Hierarchy

  GObject
   +----GInitiallyUnowned
         +----GESTimelineElement
               +----GESContainer
               +----GESTrackElement

Implemented Interfaces

GESTimelineElement implements GESExtractable and GESMetaContainer.

Description

The GESTimelineElement base class implements the notion of timing as well as priority. A GESTimelineElement can have a parent object which will be responsible for controlling its timing properties.

Details

GESTimelineElement

typedef struct {
  /*< read only >*/
  GESTimelineElement *parent;
  GESAsset *asset;
  GstClockTime start;
  GstClockTime inpoint;
  GstClockTime duration;
  GstClockTime maxduration;
  guint32 priority;
  GESTimeline *timeline;
} GESTimelineElement;

Those filed can be accessed from outside but in no case should be changed from there. Subclasses can write them but should make sure to properly call g_object_notify.

GESTimelineElement *parent;

 The GESTimelineElement that controls the object

GESAsset *asset;

 The GESAsset from which the object has been extracted

GstClockTime start;

 position (in time) of the object

GstClockTime inpoint;

 Position in the media from which the object should be used

GstClockTime duration;

 duration of the object to be used

GstClockTime maxduration;

 The maximum duration the object can have

guint32 priority;

 priority of the object in the layer (0:top priority)

GESTimeline *timeline;

GESTimelineElementClass

typedef struct {
  GInitiallyUnownedClass parent_class;

  gboolean (*set_parent)       (GESTimelineElement * self, GESTimelineElement *parent);
  gboolean (*set_start)        (GESTimelineElement * self, GstClockTime start);
  gboolean (*set_inpoint)      (GESTimelineElement * self, GstClockTime inpoint);
  gboolean (*set_duration)     (GESTimelineElement * self, GstClockTime duration);
  gboolean (*set_max_duration) (GESTimelineElement * self, GstClockTime maxduration);
  gboolean (*set_priority)     (GESTimelineElement * self, guint32 priority);

  gboolean (*ripple)           (GESTimelineElement *self, guint64  start);
  gboolean (*ripple_end)       (GESTimelineElement *self, guint64  end);
  gboolean (*roll_start)       (GESTimelineElement *self, guint64  start);
  gboolean (*roll_end)         (GESTimelineElement *self, guint64  end);
  gboolean (*trim)             (GESTimelineElement *self, guint64  start);
  void (*deep_copy)            (GESTimelineElement *self, GESTimelineElement *copy);
} GESTimelineElementClass;

The GESTimelineElement base class. Subclasses should override at least set_start set_inpoint set_duration ripple ripple_end roll_start roll_end and trim.

Vmethods in subclasses should apply all the operation they need to but the real method implementation is in charge of setting the proper field, and emit the notify signal.

GInitiallyUnownedClass parent_class;

set_parent ()

 method to set the parent of a GESTimelineElement.

set_start ()

 method to set the start of a GESTimelineElement

set_inpoint ()

 method to set the inpoint of a GESTimelineElement

set_duration ()

 method to set the duration of a GESTimelineElement

set_max_duration ()

 method to set the maximun duration of a GESTimelineElement

set_priority ()

 method to set the priority of a GESTimelineElement

ripple ()

 method to ripple an object

ripple_end ()

 method to ripple an object on its GES_EDGE_END edge

roll_start ()

 method to roll an object on its GES_EDGE_START edge

roll_end ()

 method to roll an object on its GES_EDGE_END edge

trim ()

 method to trim an object

deep_copy ()

 Copy the children properties of self into copy

ges_timeline_element_set_parent ()

gboolean            ges_timeline_element_set_parent     (GESTimelineElement *self,
                                                         GESTimelineElement *parent);

Sets the parent of self to parent. The object's reference count will be incremented, and any floating reference will be removed (see gst_object_ref_sink()).

self :

 a GESTimelineElement

parent :

 new parent of self

Returns :

 TRUE if parent could be set or FALSE when self already had a parent or self and parent are the same.

ges_timeline_element_get_parent ()

GESTimelineElement * ges_timeline_element_get_parent    (GESTimelineElement *self);

Returns the parent of self. This function increases the refcount of the parent object so you should gst_object_unref() it after usage.

self :

 a GESTimelineElement

Returns :

 parent of self, this can be NULL if self has no parent. unref after usage. [transfer full]

ges_timeline_element_set_timeline ()

gboolean            ges_timeline_element_set_timeline   (GESTimelineElement *self,
                                                         GESTimeline *timeline);

Sets the timeline of self to timeline.

self :

 a GESTimelineElement

timeline :

 The GESTimeline self is in

Returns :

 TRUE if timeline could be set or FALSE when timeline already had a timeline.

ges_timeline_element_get_timeline ()

GESTimeline *       ges_timeline_element_get_timeline   (GESTimelineElement *self);

Returns the timeline of self. This function increases the refcount of the timeline so you should gst_object_unref() it after usage.

self :

 a GESTimelineElement

Returns :

 timeline of self, this can be NULL if self has no timeline. unref after usage. [transfer full]

ges_timeline_element_set_start ()

void                ges_timeline_element_set_start      (GESTimelineElement *self,
                                                         GstClockTime start);

Set the position of the object in its containing layer

Note that if the timeline snap-distance property of the timeline containing self is set, self will properly snap to its neighboors.

self :

 a GESTimelineElement

start :

 the position in GstClockTime

ges_timeline_element_set_inpoint ()

void                ges_timeline_element_set_inpoint    (GESTimelineElement *self,
                                                         GstClockTime inpoint);

Set the in-point, that is the moment at which the self will start outputting data from its contents.

self :

 a GESTimelineElement

inpoint :

 the in-point in GstClockTime

ges_timeline_element_set_duration ()

void                ges_timeline_element_set_duration   (GESTimelineElement *self,
                                                         GstClockTime duration);

Set the duration of the object

Note that if the timeline snap-distance property of the timeline containing self is set, self will properly snap to its neighboors.

self :

 a GESTimelineElement

duration :

 the duration in GstClockTime

ges_timeline_element_set_max_duration ()

void                ges_timeline_element_set_max_duration
                                                        (GESTimelineElement *self,
                                                         GstClockTime maxduration);

Set the maximun duration of the object

self :

 a GESTimelineElement

maxduration :

 the maximum duration in GstClockTime

ges_timeline_element_set_priority ()

void                ges_timeline_element_set_priority   (GESTimelineElement *self,
                                                         guint32 priority);

Sets the priority of the object within the containing layer

self :

 a GESTimelineElement

priority :

 the priority

ges_timeline_element_get_start ()

GstClockTime        ges_timeline_element_get_start      (GESTimelineElement *self);

self :

 a GESTimelineElement

Returns :

 The start of self

ges_timeline_element_get_inpoint ()

GstClockTime        ges_timeline_element_get_inpoint    (GESTimelineElement *self);

self :

 a GESTimelineElement

Returns :

 The inpoint of self

ges_timeline_element_get_duration ()

GstClockTime        ges_timeline_element_get_duration   (GESTimelineElement *self);

self :

 a GESTimelineElement

Returns :

 The duration of self

ges_timeline_element_get_max_duration ()

GstClockTime        ges_timeline_element_get_max_duration
                                                        (GESTimelineElement *self);

self :

 a GESTimelineElement

Returns :

 The maxduration of self

ges_timeline_element_get_priority ()

guint32             ges_timeline_element_get_priority   (GESTimelineElement *self);

self :

 a GESTimelineElement

Returns :

 The priority of self

ges_timeline_element_ripple ()

gboolean            ges_timeline_element_ripple         (GESTimelineElement *self,
                                                         GstClockTime start);

Edits self in ripple mode. It allows you to modify the start of self and move the following neighbours accordingly. This will change the overall timeline duration.

self :

 The GESTimelineElement to ripple.

start :

 The new start of self in ripple mode.

Returns :

 TRUE if the self as been rippled properly, FALSE if an error occured

ges_timeline_element_ripple_end ()

gboolean            ges_timeline_element_ripple_end     (GESTimelineElement *self,
                                                         GstClockTime end);

Edits self in ripple mode. It allows you to modify the duration of a self and move the following neighbours accordingly. This will change the overall timeline duration.

self :

 The GESTimelineElement to ripple.

end :

 The new end (start + duration) of self in ripple mode. It will basically only change the duration of self.

Returns :

 TRUE if the self as been rippled properly, FALSE if an error occured

ges_timeline_element_roll_start ()

gboolean            ges_timeline_element_roll_start     (GESTimelineElement *self,
                                                         GstClockTime start);

Edits self in roll mode. It allows you to modify the start and inpoint of a self and "resize" (basicly change the duration in this case) of the previous neighbours accordingly. This will not change the overall timeline duration.

self :

 The GESTimelineElement to roll

start :

 The new start of self in roll mode, it will also adapat the in-point of self according

Returns :

 TRUE if the self as been roll properly, FALSE if an error occured

ges_timeline_element_roll_end ()

gboolean            ges_timeline_element_roll_end       (GESTimelineElement *self,
                                                         GstClockTime end);

Edits self in roll mode. It allows you to modify the duration of a self and trim (basicly change the start + inpoint in this case) the following neighbours accordingly. This will not change the overall timeline duration.

self :

 The GESTimelineElement to roll.

end :

 The new end (start + duration) of self in roll mode

Returns :

 TRUE if the self as been rolled properly, FALSE if an error occured

ges_timeline_element_trim ()

gboolean            ges_timeline_element_trim           (GESTimelineElement *self,
                                                         GstClockTime start);

Edits self in trim mode. It allows you to modify the inpoint and start of self. This will not change the overall timeline duration.

Note that to trim the end of an self you can just set its duration. The same way as this method, it will take into account the snapping-distance property of the timeline in which self is.

self :

 The GESTimelineElement to trim.

start :

 The new start of self in trim mode, will adapt the inpoint of self accordingly

Returns :

 TRUE if the self as been trimmed properly, FALSE if an error occured

ges_timeline_element_get_toplevel_parent ()

GESTimelineElement * ges_timeline_element_get_toplevel_parent
                                                        (GESTimelineElement *self);

Gets the toplevel GESTimelineElement controlling self

self :

 The GESTimelineElement to get the toplevel parent from

Returns :

 The toplevel controlling parent of self. [transfer full]

GES_TIMELINE_ELEMENT_PARENT()

#define GES_TIMELINE_ELEMENT_PARENT(obj) (((GESTimelineElement*)obj)->parent)

The parent of the object.

obj :

 a GESTimelineElement

GES_TIMELINE_ELEMENT_TIMELINE()

#define GES_TIMELINE_ELEMENT_TIMELINE(obj) (((GESTimelineElement*)obj)->timeline)

The timeline in which the object is.

obj :

 a GESTimelineElement

GES_TIMELINE_ELEMENT_START()

#define GES_TIMELINE_ELEMENT_START(obj) (((GESTimelineElement*)obj)->start)

The start position of the object (in nanoseconds).

obj :

 a GESTimelineElement

GES_TIMELINE_ELEMENT_END()

#define GES_TIMELINE_ELEMENT_END(obj) ((((GESTimelineElement*)obj)->start) + (((GESTimelineElement*)obj)->duration))

The end position of the object (in nanoseconds).

obj :

 a GESTimelineElement

GES_TIMELINE_ELEMENT_INPOINT()

#define GES_TIMELINE_ELEMENT_INPOINT(obj) (((GESTimelineElement*)obj)->inpoint)

The in-point of the object (in nanoseconds).

obj :

 a GESTimelineElement

GES_TIMELINE_ELEMENT_DURATION()

#define GES_TIMELINE_ELEMENT_DURATION(obj) (((GESTimelineElement*)obj)->duration)

The duration of the object (in nanoseconds).

obj :

 a GESTimelineElement

GES_TIMELINE_ELEMENT_MAX_DURATION()

#define GES_TIMELINE_ELEMENT_MAX_DURATION(obj) (((GESTimelineElement*)obj)->maxduration)

The maximun duration of the object (in nanoseconds).

obj :

 a GESTimelineElement

GES_TIMELINE_ELEMENT_PRIORITY()

#define GES_TIMELINE_ELEMENT_PRIORITY(obj) (((GESTimelineElement*)obj)->priority)

The priority of the object.

obj :

 a GESTimelineElement
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