GESTrackElement

GESTrackElement — Base Class for objects contained in a GESTrack

Functions

Properties

gboolean active Read / Write
GESTrack * track Read
GESTrackType track-type Read / Write / Construct

Signals

void deep-notify No Hooks

Types and Values

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GESTimelineElement
            ╰── GESTrackElement
                ├── GESSource
                ╰── GESOperation

Implemented Interfaces

GESTrackElement implements GESExtractable and GESMetaContainer.

Includes

#include <ges/ges.h>

Description

GESTrackElement is the Base Class for any object that can be contained in a GESTrack.

It contains the basic information as to the location of the object within its container, like the start position, the inpoint, the duration and the priority.

Functions

ges_track_element_set_active ()

gboolean
ges_track_element_set_active (GESTrackElement *object,
                              gboolean active);

Sets the usage of the object . If active is TRUE, the object will be used for playback and rendering, else it will be ignored.

Parameters

object

a GESTrackElement

 

active

visibility

 

Returns

TRUE if the property was toggled, else FALSE


ges_track_element_get_track ()

GESTrack *
ges_track_element_get_track (GESTrackElement *object);

Get the GESTrack to which this object belongs.

Parameters

object

a GESTrackElement

 

Returns

The GESTrack to which this object belongs. Can be NULL if it is not in any track.

[transfer none]


ges_track_element_get_gnlobject ()

GstElement *
ges_track_element_get_gnlobject (GESTrackElement *object);

Get the GNonLin object this object is controlling.

Parameters

object

a GESTrackElement

 

Returns

the GNonLin object this object is controlling.

[transfer none]


ges_track_element_get_element ()

GstElement *
ges_track_element_get_element (GESTrackElement *object);

Get the GstElement this track element is controlling within GNonLin.

Parameters

object

a GESTrackElement

 

Returns

the GstElement this track element is controlling within GNonLin.

[transfer none]


ges_track_element_is_active ()

gboolean
ges_track_element_is_active (GESTrackElement *object);

Lets you know if object will be used for playback and rendering, or not.

Parameters

object

a GESTrackElement

 

Returns

TRUE if object is active, FALSE otherwize


ges_track_element_lookup_child ()

gboolean
ges_track_element_lookup_child (GESTrackElement *object,
                                const gchar *prop_name,
                                GstElement **element,
                                GParamSpec **pspec);

Looks up which element and pspec would be effected by the given name . If various contained elements have this property name you will get the first one, unless you specify the class name in name .

Parameters

object

object to lookup the property in

 

prop_name

name of the property to look up. You can specify the name of the class as such: "ClassName::property-name", to guarantee that you get the proper GParamSpec in case various GstElement-s contain the same property name. If you don't do so, you will get the first element found, having this property and the and the corresponding GParamSpec.

 

element

pointer to a GstElement that takes the real object to set property on.

[out][allow-none][transfer full]

pspec

pointer to take the GParamSpec describing the property.

[out][allow-none][transfer full]

Returns

TRUE if element and pspec could be found. FALSE otherwise. In that case the values for pspec and element are not modified. Unref element after usage.


ges_track_element_list_children_properties ()

GParamSpec **
ges_track_element_list_children_properties
                               (GESTrackElement *object,
                                guint *n_properties);

Gets an array of GParamSpec* for all configurable properties of the children of object .

Parameters

object

The GESTrackElement to get the list of children properties from

 

n_properties

return location for the length of the returned array.

[out]

Returns

an array of GParamSpec* which should be freed after use or NULL if something went wrong.

[transfer full][array length=n_properties]


ges_track_element_set_child_property ()

gboolean
ges_track_element_set_child_property (GESTrackElement *object,
                                      const gchar *property_name,
                                      GValue *value);

Sets a property of a GstElement contained in object .

Note that ges_track_element_set_child_property is really intended for language bindings, ges_track_element_set_child_properties is much more convenient for C programming.

Parameters

object

The origin GESTrackElement

 

property_name

The name of the property

 

value

the value

 

Returns

TRUE if the property was set, FALSE otherwize


ges_track_element_set_child_properties ()

void
ges_track_element_set_child_properties
                               (GESTrackElement *object,
                                const gchar *first_property_name,
                                ...);

Sets a property of a child of object . If there are various child elements that have the same property name, you can distinguish them using the following syntax: 'ClasseName::property_name' as property name. If you don't, the corresponding property of the first element found will be set.

Parameters

object

The GESTrackElement parent object

 

first_property_name

The name of the first property to set

 

...

value for the first property, followed optionally by more name/return location pairs, followed by NULL

 

ges_track_element_set_child_property_valist ()

void
ges_track_element_set_child_property_valist
                               (GESTrackElement *object,
                                const gchar *first_property_name,
                                va_list var_args);

Sets a property of a child of object . If there are various child elements that have the same property name, you can distinguish them using the following syntax: 'ClasseName::property_name' as property name. If you don't, the corresponding property of the first element found will be set.

Parameters

object

The GESTrackElement parent object

 

first_property_name

The name of the first property to set

 

var_args

value for the first property, followed optionally by more name/return location pairs, followed by NULL

 

ges_track_element_set_child_property_by_pspec ()

void
ges_track_element_set_child_property_by_pspec
                               (GESTrackElement *object,
                                GParamSpec *pspec,
                                GValue *value);

Sets a property of a child of object .

Parameters

object

a GESTrackElement

 

pspec

The GParamSpec that specifies the property you want to set

 

value

the value

 

ges_track_element_get_child_property ()

gboolean
ges_track_element_get_child_property (GESTrackElement *object,
                                      const gchar *property_name,
                                      GValue *value);

In general, a copy is made of the property contents and the caller is responsible for freeing the memory by calling g_value_unset().

Gets a property of a GstElement contained in object .

Note that ges_track_element_get_child_property is really intended for language bindings, ges_track_element_get_child_properties is much more convenient for C programming.

Parameters

object

The origin GESTrackElement

 

property_name

The name of the property

 

value

return location for the property value, it will be initialized if it is initialized with 0.

[out]

Returns

TRUE if the property was found, FALSE otherwize


ges_track_element_get_child_properties ()

void
ges_track_element_get_child_properties
                               (GESTrackElement *object,
                                const gchar *first_property_name,
                                ...);

Gets properties of a child of object .

Parameters

object

The origin GESTrackElement

 

first_property_name

The name of the first property to get

 

...

return location for the first property, followed optionally by more name/return location pairs, followed by NULL

 

ges_track_element_get_child_property_valist ()

void
ges_track_element_get_child_property_valist
                               (GESTrackElement *object,
                                const gchar *first_property_name,
                                va_list var_args);

Gets a property of a child of object . If there are various child elements that have the same property name, you can distinguish them using the following syntax: 'ClasseName::property_name' as property name. If you don't, the corresponding property of the first element found will be set.

Parameters

object

The GESTrackElement parent object

 

first_property_name

The name of the first property to get

 

var_args

value for the first property, followed optionally by more name/return location pairs, followed by NULL

 

ges_track_element_get_child_property_by_pspec ()

void
ges_track_element_get_child_property_by_pspec
                               (GESTrackElement *object,
                                GParamSpec *pspec,
                                GValue *value);

Gets a property of a child of object .

Parameters

object

a GESTrackElement

 

pspec

The GParamSpec that specifies the property you want to get

 

value

return location for the value.

[out]

ges_track_element_edit ()

gboolean
ges_track_element_edit (GESTrackElement *object,
                        GList *layers,
                        GESEditMode mode,
                        GESEdge edge,
                        guint64 position);

Edit object in the different exisiting GESEditMode modes. In the case of slide, and roll, you need to specify a GESEdge

Parameters

object

the GESTrackElement to edit

 

layers

The layers you want the edit to happen in, NULL means that the edition is done in all the GESLayers contained in the current timeline. FIXME: This is not implemented yet.

[element-type GESLayer]

mode

The GESEditMode in which the editition will happen.

 

edge

The GESEdge the edit should happen on.

 

position

The position at which to edit object (in nanosecond)

 

Returns

TRUE if the object as been edited properly, FALSE if an error occured


ges_track_element_set_control_source ()

gboolean
ges_track_element_set_control_source (GESTrackElement *object,
                                      GstControlSource *source,
                                      const gchar *property_name,
                                      const gchar *binding_type);

Creates a GstControlBinding and adds it to the GstElement concerned by the property. Use the same syntax as ges_track_element_lookup_child for the property name.

Parameters

object

the GESTrackElement on which to set a control binding

 

source

the GstControlSource to set on the binding.

[element-type GstControlSource]

property_name

The name of the property to control.

 

binding_type

The type of binding to create. Only "direct" is available for now.

 

Returns

TRUE if the binding could be created and added, FALSE if an error occured


ges_track_element_get_control_binding ()

GstControlBinding *
ges_track_element_get_control_binding (GESTrackElement *object,
                                       const gchar *property_name);

Looks up the various controlled properties for that GESTrackElement, and returns the GstControlBinding which controls property_name .

Parameters

object

the GESTrackElement in which to lookup the bindings.

 

property_name

The property_name to which the binding is associated.

 

Returns

the GstControlBinding associated with property_name , or NULL if that property is not controlled.

[transfer none]

Types and Values

GESTrackElement

typedef struct _GESTrackElement GESTrackElement;

The GESTrackElement base class.


GESTrackElementClass

typedef struct {
  /* virtual methods for subclasses */
  const gchar  *gnlobject_factorytype;
  GstElement*  (*create_gnl_object)        (GESTrackElement * object);
  GstElement*  (*create_element)           (GESTrackElement * object);

  void (*active_changed)       (GESTrackElement *object, gboolean active);

  /* virtual methods for subclasses */
  GParamSpec** (*list_children_properties) (GESTrackElement * object,
              guint *n_properties);
} GESTrackElementClass;

Subclasses can override the create_gnl_object method to override what type of GNonLin object will be created.

Members

const gchar *gnlobject_factorytype;

name of the GNonLin GStElementFactory type to use.

 

create_gnl_object ()

method to create the GNonLin container object.

 

create_element ()

method to return the GstElement to put in the gnlobject.

 

active_changed ()

active property of gnlobject has changed

 

list_children_properties ()

method to get children properties that user could like to configure. The default implementation will create an object of type gnlobject_factorytype and call create_element .

 

Property Details

The “active” property

  “active”                   gboolean

Whether the object should be taken into account in the GESTrack output. If FALSE, then its contents will not be used in the resulting track.

Flags: Read / Write

Default value: TRUE


The “track” property

  “track”                    GESTrack *

The track the object is in.

Flags: Read


The “track-type” property

  “track-type”               GESTrackType

The track type of the object.

Flags: Read / Write / Construct

Default value: GES_TRACK_TYPE_UNKNOWN

Signal Details

The “deep-notify” signal

void
user_function (GESTrackElement *track_element,
               GstElement      *prop_object,
               GParamSpec      *prop,
               gpointer         user_data)

The deep notify signal is used to be notified of property changes of all the childs of track_element

Parameters

track_element

a GESTrackElement

 

prop_object

the object that originated the signal

 

prop

the property that changed

 

user_data

user data set when the signal handler was connected.

 

Flags: No Hooks