The #GESAsset from which the object has been extracted
The #GESTimelineElement:duration of the element
The initial offset to use internally when outputting content (in nanoseconds, but in the time coordinates of the internal content).
For example, for a #GESVideoUriSource that references some media file, the "internal content" is the media file data, and the in-point would correspond to some timestamp in the media file. When playing the timeline, and when the element is first reached at timeline-time #GESTimelineElement:start, it will begin outputting the data from the timestamp in-point onwards, until it reaches the end of its #GESTimelineElement:duration in the timeline.
For elements that have no internal content, this should be kept as 0.
The #GESTimelineElement:in-point of the element
The full duration of internal content that is available (a time difference in nanoseconds using the time coordinates of the internal content).
This will act as a cap on the #GESTimelineElement:in-point of the element (which is in the same time coordinates), and will sometimes be used to limit the #GESTimelineElement:duration of the element in the timeline.
For example, for a #GESVideoUriSource that references some media file, this would be the length of the media file.
For elements that have no internal content, or whose content is indefinite, this should be kept as #GST_CLOCK_TIME_NONE.
The #GESTimelineElement:max-duration of the element
The #GESTimelineElement:name of the element
The #GESTimelineElement:parent of the element
The #GESTimelineElement:priority of the element
Whether the element should be serialized.
The #GESTimelineElement:start of the element
The #GESTimelineElement:timeline of the element
Register a property of a child of the element to allow it to be written with ges_timeline_element_set_child_property() and read with ges_timeline_element_get_child_property(). A change in the property will also appear in the #GESTimelineElement::deep-notify signal.
pspec should be unique from other children properties that have been
registered on self.
The specification for the property to add
The #GstObject who the property belongs to
Deserializes the given string, and adds and sets the found fields and their values on the container. The string should be the return of ges_meta_container_metas_to_string().
A string to deserialize and add to container
Creates a binding between source_property on source and target_property
on target.
Whenever the source_property is changed the target_property is
updated using the same value. For instance:
g_object_bind_property (action, "active", widget, "sensitive", 0);
Will result in the "sensitive" property of the widget #GObject instance to be updated with the same value of the "active" property of the action #GObject instance.
If flags contains %G_BINDING_BIDIRECTIONAL then the binding will be mutual:
if target_property on target changes then the source_property on source
will be updated as well.
The binding will automatically be removed when either the source or the
target instances are finalized. To remove the binding without affecting the
source and the target you can just call g_object_unref() on the returned
#GBinding instance.
Removing the binding by calling g_object_unref() on it must only be done if
the binding, source and target are only used from a single thread and it
is clear that both source and target outlive the binding. Especially it
is not safe to rely on this if the binding, source or target can be
finalized from different threads. Keep another reference to the binding and
use g_binding_unbind() instead to be on the safe side.
A #GObject can have multiple bindings.
the property on source to bind
the target #GObject
the property on target to bind
flags to pass to #GBinding
Creates a binding between source_property on source and target_property
on target, allowing you to set the transformation functions to be used by
the binding.
This function is the language bindings friendly version of g_object_bind_property_full(), using #GClosures instead of function pointers.
the property on source to bind
the target #GObject
the property on target to bind
flags to pass to #GBinding
a #GClosure wrapping the transformation function from the source to the target, or %NULL to use the default
a #GClosure wrapping the transformation function from the target to the source, or %NULL to use the default
Checks whether the specified field has been registered as static, and gets the registered type and flags of the field, as used in ges_meta_container_register_meta() and ges_meta_container_register_static_meta().
The key for the container field to check
Create a copy of self. All the properties of self are copied into
a new element, with the exception of #GESTimelineElement:parent,
#GESTimelineElement:timeline and #GESTimelineElement:name. Other data,
such the list of a #GESContainer's children, is not copied.
If deep is %TRUE, then the new element is prepared so that it can be
used in ges_timeline_element_paste() or ges_timeline_paste_element().
In the case of copying a #GESContainer, this ensures that the children
of self will also be pasted. The new element should not be used for
anything else and can only be used once in a pasting operation. In
particular, the new element itself is not an actual 'deep' copy of
self, but should be thought of as an intermediate object used for a
single paste operation.
Whether the copy is needed for pasting
See ges_timeline_element_edit_full(), which also gives an error.
Note that the layers argument is currently ignored, so you should
just pass %NULL.
A whitelist of layers where the edit can be performed, %NULL allows all layers in the timeline.
The priority/index of the layer self should be moved to. -1 means no move
The edit mode
The edge of self where the edit should occur
The edit position: a new location for the edge of self (in nanoseconds) in the timeline coordinates
Edits the element within its timeline by adjusting its #GESTimelineElement:start, #GESTimelineElement:duration or #GESTimelineElement:in-point, and potentially doing the same for other elements in the timeline. See #GESEditMode for details about each edit mode. An edit may fail if it would place one of these properties out of bounds, or if it would place the timeline in an unsupported configuration.
Note that if you act on a #GESTrackElement, this will edit its parent
#GESClip instead. Moreover, for any #GESTimelineElement, if you select
#GES_EDGE_NONE for #GES_EDIT_MODE_NORMAL or #GES_EDIT_MODE_RIPPLE, this
will edit the toplevel instead, but still in such a way as to make the
#GESTimelineElement:start of self reach the edit position.
Note that if the element's timeline has a #GESTimeline:snapping-distance set, then the edit position may be snapped to the edge of some element under the edited element.
new_layer_priority can be used to switch self, and other elements
moved by the edit, to a new layer. New layers may be be created if the
the corresponding layer priority/index does not yet exist for the
timeline.
The priority/index of the layer self should be moved to. -1 means no move
The edit mode
The edge of self where the edit should occur
The edit position: a new location for the edge of self (in nanoseconds) in the timeline coordinates
This function is intended for #GObject implementations to re-enforce a [floating][floating-ref] object reference. Doing this is seldom required: all #GInitiallyUnowneds are created with a floating reference which usually just needs to be sunken by calling g_object_ref_sink().
Calls the given function on each of the meta container's set metadata fields.
A function to call on each of container's set metadata fields
Increases the freeze count on object. If the freeze count is
non-zero, the emission of "notify" signals on object is
stopped. The signals are queued until the freeze count is decreased
to zero. Duplicate notifications are squashed so that at most one
#GObject::notify signal is emitted for each property modified while the
object is frozen.
This is necessary for accessors that modify multiple properties to prevent premature notification while the object is still being modified.
Get the asset that has been set on the extractable object.
Gets the current boolean value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the property of a child of the element.
property_name can either be in the format "prop-name" or
"TypeName::prop-name", where "prop-name" is the name of the property
to get (as used in g_object_get()), and "TypeName" is the type name of
the child (as returned by G_OBJECT_TYPE_NAME()). The latter format is
useful when two children of different types share the same property
name.
The first child found with the given "prop-name" property that was
registered with ges_timeline_element_add_child_property() (and of the
type "TypeName", if it was given) will have the corresponding
property copied into value.
Note that ges_timeline_element_get_child_properties() may be more convenient for C programming.
The name of the child property to get
Gets the property of a child of the element. Specifically, the property
corresponding to the pspec used in
ges_timeline_element_add_child_property() is copied into value.
The specification of a registered child property to get
Gets a named field from the objects table of associations (see g_object_set_data()).
name of the key for that association
Gets the current double value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the #GESTimelineElement:duration for the element.
Gets the current float value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the #GESAsset:id of some associated asset. It may be the case that the object has no set asset, or even that such an asset does not yet exist in the GES cache. Instead, this will return the asset #GESAsset:id that is compatible with the current state of the object, as determined by the #GESExtractable implementer. If it was indeed extracted from an asset, this should return the same as its corresponding asset #GESAsset:id.
Gets the #GESTimelineElement:in-point for the element.
Gets the current int value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the current int64 value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the priority of the layer the element is in. A #GESGroup may span several layers, so this would return the highest priority (numerically, the smallest) amongst them.
Gets the current marker list value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the #GESTimelineElement:max-duration for the element.
Gets the current value of the specified field of the meta container.
The key for the container field to get
Gets the #GESTimelineElement:name for the element.
Get the "natural" framerate of self. This is to say, for example
for a #GESVideoUriSource the framerate of the source.
Note that a #GESAudioSource may also have a natural framerate if it derives from the same #GESSourceClip asset as a #GESVideoSource, and its value will be that of the video source. For example, if the uri of a #GESUriClip points to a file that contains both a video and audio stream, then the corresponding #GESAudioUriSource will share the natural framerate of the corresponding #GESVideoUriSource.
Gets the #GESTimelineElement:parent for the element.
Gets the #GESTimelineElement:priority for the element.
Gets a property of an object.
The value can be:
In general, a copy is made of the property contents and the caller is responsible for freeing the memory by calling g_value_unset().
Note that g_object_get_property() is really intended for language bindings, g_object_get() is much more convenient for C programming.
the name of the property to get
return location for the property value
This function gets back user data pointers stored via g_object_set_qdata().
A #GQuark, naming the user data pointer
Gets the #GESTimelineElement:start for the element.
Gets the current string value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the toplevel #GESTimelineElement:parent of the element.
Gets the track types that the element can interact with, i.e. the type of #GESTrack it can exist in, or will create #GESTrackElement-s for.
Gets the current uint value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets the current uint64 value of the specified field of the meta container. If the field does not have a set value, or it is of the wrong type, the method will fail.
The key for the container field to get
Gets n_properties properties for an object.
Obtained properties will be set to values. All properties must be valid.
Warnings will be emitted and undefined behaviour may result if invalid
properties are passed in.
the names of each property to get
the values of each property to get
Checks whether object has a [floating][floating-ref] reference.
Get a list of children properties of the element, which is a list of all the specifications passed to ges_timeline_element_add_child_property().
Looks up a child property of the element.
prop_name can either be in the format "prop-name" or
"TypeName::prop-name", where "prop-name" is the name of the property
to look up (as used in g_object_get()), and "TypeName" is the type name
of the child (as returned by G_OBJECT_TYPE_NAME()). The latter format is
useful when two children of different types share the same property
name.
The first child found with the given "prop-name" property that was
registered with ges_timeline_element_add_child_property() (and of the
type "TypeName", if it was given) will be passed to child, and the
registered specification of this property will be passed to pspec.
The name of a child property
Serializes the set metadata fields of the meta container to a string.
Emits a "notify" signal for the property property_name on object.
When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.
Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.
the name of a property installed on the class of object.
Emits a "notify" signal for the property specified by pspec on object.
This function omits the property name lookup, hence it is faster than g_object_notify().
One way to avoid using g_object_notify() from within the class that registered the properties, and using g_object_notify_by_pspec() instead, is to store the GParamSpec used with g_object_class_install_property() inside a static array, e.g.:
enum
{
PROP_0,
PROP_FOO,
PROP_LAST
};
static GParamSpec *properties[PROP_LAST];
static void
my_object_class_init (MyObjectClass *klass)
{
properties[PROP_FOO] = g_param_spec_int ("foo", "Foo", "The foo",
0, 100,
50,
G_PARAM_READWRITE);
g_object_class_install_property (gobject_class,
PROP_FOO,
properties[PROP_FOO]);
}
and then notify a change on the "foo" property with:
g_object_notify_by_pspec (self, properties[PROP_FOO]);
the #GParamSpec of a property installed on the class of object.
Paste an element inside the same timeline and layer as self. self
must be the return of ges_timeline_element_copy() with deep=TRUE,
and it should not be changed before pasting.
self is not placed in the timeline, instead a new element is created,
alike to the originally copied element. Note that the originally
copied element must stay within the same timeline and layer, at both
the point of copying and pasting.
Pasting may fail if it would place the timeline in an unsupported configuration.
After calling this function element should not be used. In particular,
element can not be pasted again. Instead, you can copy the
returned element and paste that copy (although, this is only possible
if the paste was successful).
See also ges_timeline_paste_element().
The position in the timeline element should be pasted to, i.e. the #GESTimelineElement:start value for the pasted element.
Increase the reference count of object, and possibly remove the
[floating][floating-ref] reference, if object has a floating reference.
In other words, if the object is floating, then this call "assumes ownership" of the floating reference, converting it to a normal reference by clearing the floating flag while leaving the reference count unchanged. If the object is not floating, then this call adds a new normal reference increasing the reference count by one.
Since GLib 2.56, the type of object will be propagated to the return type
under the same conditions as for g_object_ref().
Sets the value of the specified field of the meta container to the
given value, and registers the field to only hold a value of the
same type. After calling this, only values of the same type as value
can be set for this field. The given flags can be set to make this
field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given boolean value, and registers the field to only hold a boolean typed value. After calling this, only boolean values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given date value, and registers the field to only hold a date typed value. After calling this, only date values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given date time value, and registers the field to only hold a date time typed value. After calling this, only date time values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given double value, and registers the field to only hold a double typed value. After calling this, only double values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given float value, and registers the field to only hold a float typed value. After calling this, only float values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given int value, and registers the field to only hold an int typed value. After calling this, only int values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given int64 value, and registers the field to only hold an int64 typed value. After calling this, only int64 values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given string value, and registers the field to only hold a string typed value. After calling this, only string values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given uint value, and registers the field to only hold a uint typed value. After calling this, only uint values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Sets the value of the specified field of the meta container to the given uint64 value, and registers the field to only hold a uint64 typed value. After calling this, only uint64 values can be set for this field. The given flags can be set to make this field only readable after calling this method.
Flags to be used for the registered field
The key for the container field to register
The value to set for the registered field
Registers a static metadata field on the container to only hold the specified type. After calling this, setting a value under this field can only succeed if its type matches the registered type of the field.
Unlike ges_meta_container_register_meta(), no (initial) value is set for this field, which means you can use this method to reserve the space to be optionally set later.
Note that if a value has already been set for the field being
registered, then its type must match the registering type, and its
value will be left in place. If the field has no set value, then
you will likely want to include #GES_META_WRITABLE in flags to allow
the value to be set later.
Flags to be used for the registered field
The key for the container field to register
The required value type for the registered field
Remove a child property from the element. pspec should be a
specification that was passed to
ges_timeline_element_add_child_property(). The corresponding property
will no longer be registered as a child property for the element.
The specification for the property to remove
Edits the start time of an element within its timeline in ripple mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_RIPPLE and #GES_EDGE_NONE.
The new start time of self in ripple mode
Edits the end time of an element within its timeline in ripple mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_RIPPLE and #GES_EDGE_END.
The new end time of self in ripple mode
Edits the end time of an element within its timeline in roll mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_ROLL and #GES_EDGE_END.
The new end time of self in roll mode
Edits the start time of an element within its timeline in roll mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_ROLL and #GES_EDGE_START.
The new start time of self in roll mode
Releases all references to other objects. This can be used to break reference cycles.
This function should only be called from object system implementations.
Sets the asset for this extractable object.
When an object is extracted from an asset using ges_asset_extract() its
asset will be automatically set. Note that many classes that implement
#GESExtractable will automatically create their objects using assets
when you call their new methods. However, you can use this method to
associate an object with a compatible asset if it was created by other
means and does not yet have an asset. Or, for some implementations of
#GESExtractable, you can use this to change the asset of the given
extractable object, which will lead to a change in its state to
match the new asset #GESAsset:id.
The asset to set
Sets the value of the specified field of the meta container to the given boolean value.
The key for the container field to set
The value to set under meta_item
See ges_timeline_element_set_child_property_full(), which also gives an error.
Note that ges_timeline_element_set_child_properties() may be more convenient for C programming.
The name of the child property to set
The value to set the property to
Sets the property of a child of the element. Specifically, the property
corresponding to the pspec used in
ges_timeline_element_add_child_property() is set to value.
The specification of a registered child property to set
The value to set the property to
Sets the property of a child of the element.
property_name can either be in the format "prop-name" or
"TypeName::prop-name", where "prop-name" is the name of the property
to set (as used in g_object_set()), and "TypeName" is the type name of
the child (as returned by G_OBJECT_TYPE_NAME()). The latter format is
useful when two children of different types share the same property
name.
The first child found with the given "prop-name" property that was
registered with ges_timeline_element_add_child_property() (and of the
type "TypeName", if it was given) will have the corresponding
property set to value. Other children that may have also matched the
property name (and type name) are left unchanged!
The name of the child property to set
The value to set the property to
Each object carries around a table of associations from strings to pointers. This function lets you set an association.
If the object already had an association with that name, the old association will be destroyed.
Internally, the key is converted to a #GQuark using g_quark_from_string().
This means a copy of key is kept permanently (even after object has been
finalized) — so it is recommended to only use a small, bounded set of values
for key in your program, to avoid the #GQuark storage growing unbounded.
name of the key
data to associate with that key
Sets the value of the specified field of the meta container to the given double value.
The key for the container field to set
The value to set under meta_item
Sets #GESTimelineElement:duration for the element.
Whilst the element is part of a #GESTimeline, this is the same as editing the element with ges_timeline_element_edit() under #GES_EDIT_MODE_TRIM with #GES_EDGE_END. In particular, the #GESTimelineElement:duration of the element may be snapped to a different timeline time difference from the one given. In addition, setting may fail if it would place the timeline in an unsupported configuration, or the element does not have enough internal content to last the desired duration.
The desired duration in its timeline
Sets the value of the specified field of the meta container to the given float value.
The key for the container field to set
The value to set under meta_item
Sets #GESTimelineElement:in-point for the element. If the new in-point is above the current #GESTimelineElement:max-duration of the element, this method will fail.
The in-point, in internal time coordinates
Sets the value of the specified field of the meta container to the given int value.
The key for the container field to set
The value to set under meta_item
Sets the value of the specified field of the meta container to the given int64 value.
The key for the container field to set
The value to set under meta_item
Sets the value of the specified field of the meta container to the given marker list value.
The key for the container field to set
The value to set under meta_item
Sets #GESTimelineElement:max-duration for the element. If the new maximum duration is below the current #GESTimelineElement:in-point of the element, this method will fail.
The maximum duration, in internal time coordinates
Sets the value of the specified field of the meta container to a
copy of the given value. If the given value is %NULL, the field
given by meta_item is removed and %TRUE is returned.
The key for the container field to set
The value to set under meta_item, or %NULL to remove the corresponding field
Sets the #GESTimelineElement:name for the element. If %NULL is given
for name, then the library will instead generate a new name based on
the type name of the element, such as the name "uriclip3" for a
#GESUriClip, and will set that name instead.
If self already has a #GESTimelineElement:timeline, you should not
call this function with name set to %NULL.
You should ensure that, within each #GESTimeline, every element has a
unique name. If you call this function with name as %NULL, then
the library should ensure that the set generated name is unique from
previously generated names. However, if you choose a name that
interferes with the naming conventions of the library, the library will
attempt to ensure that the generated names will not conflict with the
chosen name, which may lead to a different name being set instead, but
the uniqueness between generated and user-chosen names is not
guaranteed.
The name self should take
Sets the #GESTimelineElement:parent for the element.
This is used internally and you should normally not call this. A #GESContainer will set the #GESTimelineElement:parent of its children in ges_container_add() and ges_container_remove().
Note, if parent is not %NULL, self must not already have a parent
set. Therefore, if you wish to switch parents, you will need to call
this function twice: first to set the parent to %NULL, and then to the
new parent.
If parent is not %NULL, you must ensure it already has a
(non-floating) reference to self before calling this.
Sets the priority of the element within the containing layer.
The priority
Sets a property on an object.
the name of the property to set
the value
Sets #GESTimelineElement:start for the element. If the element has a parent, this will also move its siblings with the same shift.
Whilst the element is part of a #GESTimeline, this is the same as editing the element with ges_timeline_element_edit() under #GES_EDIT_MODE_NORMAL with #GES_EDGE_NONE. In particular, the #GESTimelineElement:start of the element may be snapped to a different timeline time from the one given. In addition, setting may fail if it would place the timeline in an unsupported configuration.
The desired start position of the element in its timeline
Sets the value of the specified field of the meta container to the given string value.
The key for the container field to set
The value to set under meta_item
Sets the #GESTimelineElement:timeline of the element.
This is used internally and you should normally not call this. A #GESClip will have its #GESTimelineElement:timeline set through its #GESLayer. A #GESTrack will similarly take care of setting the #GESTimelineElement:timeline of its #GESTrackElement-s. A #GESGroup will adopt the same #GESTimelineElement:timeline as its children.
If timeline is %NULL, this will stop its current
#GESTimelineElement:timeline from tracking it, otherwise timeline will
start tracking self. Note, in the latter case, self must not already
have a timeline set. Therefore, if you wish to switch timelines, you
will need to call this function twice: first to set the timeline to
%NULL, and then to the new timeline.
Sets the value of the specified field of the meta container to the given uint value.
The key for the container field to set
The value to set under meta_item
Sets the value of the specified field of the meta container to the given uint64 value.
The key for the container field to set
The value to set under meta_item
Remove a specified datum from the object's data associations, without invoking the association's destroy handler.
name of the key
This function gets back user data pointers stored via
g_object_set_qdata() and removes the data from object
without invoking its destroy() function (if any was
set).
Usually, calling this function is only required to update
user data pointers with a destroy notifier, for example:
void
object_add_to_user_list (GObject *object,
const gchar *new_string)
{
// the quark, naming the object data
GQuark quark_string_list = g_quark_from_static_string ("my-string-list");
// retrieve the old string list
GList *list = g_object_steal_qdata (object, quark_string_list);
// prepend new string
list = g_list_prepend (list, g_strdup (new_string));
// this changed 'list', so we need to set it again
g_object_set_qdata_full (object, quark_string_list, list, free_string_list);
}
static void
free_string_list (gpointer data)
{
GList *node, *list = data;
for (node = list; node; node = node->next)
g_free (node->data);
g_list_free (list);
}
Using g_object_get_qdata() in the above example, instead of g_object_steal_qdata() would have left the destroy function set, and thus the partial string list would have been freed upon g_object_set_qdata_full().
A #GQuark, naming the user data pointer
Reverts the effect of a previous call to
g_object_freeze_notify(). The freeze count is decreased on object
and when it reaches zero, queued "notify" signals are emitted.
Duplicate notifications for each property are squashed so that at most one #GObject::notify signal is emitted for each property, in the reverse order in which they have been queued.
It is an error to call this function when the freeze count is zero.
Edits the start time of an element within its timeline in trim mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_TRIM and #GES_EDGE_START.
The new start time of self in trim mode
Decreases the reference count of object. When its reference count
drops to 0, the object is finalized (i.e. its memory is freed).
If the pointer to the #GObject may be reused in future (for example, if it is an instance variable of another object), it is recommended to clear the pointer to %NULL rather than retain a dangling pointer to a potentially invalid #GObject instance. Use g_clear_object() for this.
Gets the #GESAsset:id of some associated asset. It may be the case that the object has no set asset, or even that such an asset does not yet exist in the GES cache. Instead, this will return the asset #GESAsset:id that is compatible with the current state of the object, as determined by the #GESExtractable implementer. If it was indeed extracted from an asset, this should return the same as its corresponding asset #GESAsset:id.
Gets the priority of the layer the element is in. A #GESGroup may span several layers, so this would return the highest priority (numerically, the smallest) amongst them.
Get the "natural" framerate of self. This is to say, for example
for a #GESVideoUriSource the framerate of the source.
Note that a #GESAudioSource may also have a natural framerate if it derives from the same #GESSourceClip asset as a #GESVideoSource, and its value will be that of the video source. For example, if the uri of a #GESUriClip points to a file that contains both a video and audio stream, then the corresponding #GESAudioUriSource will share the natural framerate of the corresponding #GESVideoUriSource.
Gets the track types that the element can interact with, i.e. the type of #GESTrack it can exist in, or will create #GESTrackElement-s for.
Looks up a child property of the element.
prop_name can either be in the format "prop-name" or
"TypeName::prop-name", where "prop-name" is the name of the property
to look up (as used in g_object_get()), and "TypeName" is the type name
of the child (as returned by G_OBJECT_TYPE_NAME()). The latter format is
useful when two children of different types share the same property
name.
The first child found with the given "prop-name" property that was
registered with ges_timeline_element_add_child_property() (and of the
type "TypeName", if it was given) will be passed to child, and the
registered specification of this property will be passed to pspec.
The name of a child property
Emits a "notify" signal for the property property_name on object.
When possible, eg. when signaling a property change from within the class that registered the property, you should use g_object_notify_by_pspec() instead.
Note that emission of the notify signal may be blocked with g_object_freeze_notify(). In this case, the signal emissions are queued and will be emitted (in reverse order) when g_object_thaw_notify() is called.
Edits the start time of an element within its timeline in ripple mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_RIPPLE and #GES_EDGE_NONE.
The new start time of self in ripple mode
Edits the end time of an element within its timeline in ripple mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_RIPPLE and #GES_EDGE_END.
The new end time of self in ripple mode
Edits the end time of an element within its timeline in roll mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_ROLL and #GES_EDGE_END.
The new end time of self in roll mode
Edits the start time of an element within its timeline in roll mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_ROLL and #GES_EDGE_START.
The new start time of self in roll mode
Sets #GESTimelineElement:duration for the element.
Whilst the element is part of a #GESTimeline, this is the same as editing the element with ges_timeline_element_edit() under #GES_EDIT_MODE_TRIM with #GES_EDGE_END. In particular, the #GESTimelineElement:duration of the element may be snapped to a different timeline time difference from the one given. In addition, setting may fail if it would place the timeline in an unsupported configuration, or the element does not have enough internal content to last the desired duration.
The desired duration in its timeline
Sets #GESTimelineElement:in-point for the element. If the new in-point is above the current #GESTimelineElement:max-duration of the element, this method will fail.
The in-point, in internal time coordinates
Sets #GESTimelineElement:max-duration for the element. If the new maximum duration is below the current #GESTimelineElement:in-point of the element, this method will fail.
The maximum duration, in internal time coordinates
Sets the #GESTimelineElement:parent for the element.
This is used internally and you should normally not call this. A #GESContainer will set the #GESTimelineElement:parent of its children in ges_container_add() and ges_container_remove().
Note, if parent is not %NULL, self must not already have a parent
set. Therefore, if you wish to switch parents, you will need to call
this function twice: first to set the parent to %NULL, and then to the
new parent.
If parent is not %NULL, you must ensure it already has a
(non-floating) reference to self before calling this.
Sets the priority of the element within the containing layer.
The priority
Sets #GESTimelineElement:start for the element. If the element has a parent, this will also move its siblings with the same shift.
Whilst the element is part of a #GESTimeline, this is the same as editing the element with ges_timeline_element_edit() under #GES_EDIT_MODE_NORMAL with #GES_EDGE_NONE. In particular, the #GESTimelineElement:start of the element may be snapped to a different timeline time from the one given. In addition, setting may fail if it would place the timeline in an unsupported configuration.
The desired start position of the element in its timeline
Edits the start time of an element within its timeline in trim mode. See ges_timeline_element_edit() with #GES_EDIT_MODE_TRIM and #GES_EDGE_START.
The new start time of self in trim mode
This function essentially limits the life time of the closure to
the life time of the object. That is, when the object is finalized,
the closure is invalidated by calling g_closure_invalidate() on
it, in order to prevent invocations of the closure with a finalized
(nonexisting) object. Also, g_object_ref() and g_object_unref() are
added as marshal guards to the closure, to ensure that an extra
reference count is held on object during invocation of the
closure. Usually, this function will be called on closures that
use this object as closure data.
#GClosure to watch
Find the #GParamSpec with the given name for an
interface. Generally, the interface vtable passed in as g_iface
will be the default vtable from g_type_default_interface_ref(), or,
if you know the interface has already been loaded,
g_type_default_interface_peek().
any interface vtable for the interface, or the default vtable for the interface
name of a property to look up.
Add a property to an interface; this is only useful for interfaces that are added to GObject-derived types. Adding a property to an interface forces all objects classes with that interface to have a compatible property. The compatible property could be a newly created #GParamSpec, but normally g_object_class_override_property() will be used so that the object class only needs to provide an implementation and inherits the property description, default value, bounds, and so forth from the interface property.
This function is meant to be called from the interface's default
vtable initialization function (the class_init member of
#GTypeInfo.) It must not be called after after class_init has
been called for any object types implementing this interface.
If pspec is a floating reference, it will be consumed.
any interface vtable for the interface, or the default vtable for the interface.
the #GParamSpec for the new property
Lists the properties of an interface.Generally, the interface
vtable passed in as g_iface will be the default vtable from
g_type_default_interface_ref(), or, if you know the interface has
already been loaded, g_type_default_interface_peek().
any interface vtable for the interface, or the default vtable for the interface
Creates a new instance of a #GObject subtype and sets its properties.
Construction parameters (see %G_PARAM_CONSTRUCT, %G_PARAM_CONSTRUCT_ONLY) which are not explicitly specified are set to their default values.
the type id of the #GObject subtype to instantiate
an array of #GParameter
A #GESTimelineElement will have some temporal extent in its corresponding #GESTimelineElement:timeline, controlled by its #GESTimelineElement:start and #GESTimelineElement:duration. This determines when its content will be displayed, or its effect applied, in the timeline. Several objects may overlap within a given #GESTimeline, in which case their #GESTimelineElement:priority is used to determine their ordering in the timeline. Priority is mostly handled internally by #GESLayer-s and #GESClip-s.
A timeline element can have a #GESTimelineElement:parent, such as a #GESClip, which is responsible for controlling its timing.
Editing
Elements can be moved around in their #GESTimelineElement:timeline by setting their #GESTimelineElement:start and #GESTimelineElement:duration using ges_timeline_element_set_start() and ges_timeline_element_set_duration(). Additionally, which parts of the underlying content are played in the timeline can be adjusted by setting the #GESTimelineElement:in-point using ges_timeline_element_set_inpoint(). The library also provides ges_timeline_element_edit(), with various #GESEditMode-s, which can adjust these properties in a convenient way, as well as introduce similar changes in neighbouring or later elements in the timeline.
However, a timeline may refuse a change in these properties if they would place the timeline in an unsupported configuration. See #GESTimeline for its overlap rules.
Additionally, an edit may be refused if it would place one of the timing properties out of bounds (such as a negative time value for #GESTimelineElement:start, or having insufficient internal content to last for the desired #GESTimelineElement:duration).
Time Coordinates
There are three main sets of time coordinates to consider when using timeline elements:
You can determine the timeline time for a given internal source time in a #GESTrack in a #GESClip using ges_clip_get_timeline_time_from_internal_time(), and vice versa using ges_clip_get_internal_time_from_timeline_time(), for the purposes of editing and setting timings properties.
Children Properties
If a timeline element owns another #GstObject and wishes to expose some of its properties, it can do so by registering the property as one of the timeline element's children properties using ges_timeline_element_add_child_property(). The registered property of the child can then be read and set using the ges_timeline_element_get_child_property() and ges_timeline_element_set_child_property() methods, respectively. Some sub-classed objects will be created with pre-registered children properties; for example, to expose part of an underlying #GstElement that is used internally. The registered properties can be listed with ges_timeline_element_list_children_properties().