Whether to automatically create a #GESTransitionClip whenever two #GESSource-s that both belong to a #GESClip in the layer overlap. See #GESTimeline for what counts as an overlap.
When a layer is added to a #GESTimeline, if this property is left as %FALSE, but the timeline's #GESTimeline:auto-transition is %TRUE, it will be set to %TRUE as well.
The priority of the layer in the #GESTimeline. 0 is the highest priority. Conceptually, a timeline is a stack of layers, and the priority of the layer represents its position in the stack. Two layers should not have the same priority within a given GESTimeline.
Note that the timeline needs to be committed (with #ges_timeline_commit) for the change to be taken into account.
the #GESTimeline where this layer is being used.
See ges_layer_add_asset_full(), which also gives an error.
The asset to extract the new clip from
The #GESTimelineElement:start value to set on the new clip If start == #GST_CLOCK_TIME_NONE, it will be added to the end of layer, i.e. it will be set to layer's duration
The #GESTimelineElement:in-point value to set on the new clip
The #GESTimelineElement:duration value to set on the new clip
The #GESClip:supported-formats to set on the the new clip, or #GES_TRACK_TYPE_UNKNOWN to use the default
Extracts a new clip from an asset and adds it to the layer with the given properties.
The asset to extract the new clip from
The #GESTimelineElement:start value to set on the new clip If start == #GST_CLOCK_TIME_NONE, it will be added to the end of layer, i.e. it will be set to layer's duration
The #GESTimelineElement:in-point value to set on the new clip
The #GESTimelineElement:duration value to set on the new clip
The #GESClip:supported-formats to set on the the new clip, or #GES_TRACK_TYPE_UNKNOWN to use the default
See ges_layer_add_clip_full(), which also gives an error.
The clip to add
Adds the given clip to the layer. If the method succeeds, the layer will take ownership of the clip.
This method will fail and return %FALSE if clip already resides in
some layer. It can also fail if the additional clip breaks some
compositional rules (see #GESTimelineElement).
The clip to add
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
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.
Gets whether the layer is active for the given track. See ges_layer_set_active_for_tracks().
The #GESTrack to check if layer is currently active for
Get the asset that has been set on the extractable object.
Gets the #GESLayer:auto-transition of the layer.
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
Get the #GESClip-s contained in this layer.
Gets the clips within the layer that appear between start and end.
Start of the interval
End of the interval
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
Retrieves the duration of the layer, which is the difference between the start of the layer (always time 0) and the end (which will be the end time of the final clip).
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 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 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 current value of the specified field of the meta container.
The key for the container field to get
Get the priority of the layer. When inside a timeline, this is its index in the timeline. See ges_timeline_move_layer().
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 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 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
Convenience method to check if the layer is empty (doesn't contain any #GESClip), or not.
Checks whether object has a [floating][floating-ref] reference.
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.
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
Removes the given clip from the layer.
The clip to remove
Releases all references to other objects. This can be used to break reference cycles.
This function should only be called from object system implementations.
Activate or deactivate track elements in tracks (or in all tracks if tracks
is %NULL).
When a layer is deactivated for a track, all the #GESTrackElement-s in the track that belong to a #GESClip in the layer will no longer be active in the track, regardless of their individual #GESTrackElement:active value.
Note that by default a layer will be active for all of its timeline's tracks.
Whether elements in tracks should be active or not
The list of tracks layer should be (de-)active in, or %NULL to include all the tracks in the layer's timeline
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 #GESLayer:auto-transition for the layer. Use ges_timeline_set_auto_transition() if you want all layers within a #GESTimeline to have #GESLayer:auto-transition set to %TRUE. Use this method if you want different values for different layers (and make sure to keep #GESTimeline:auto-transition as %FALSE for the corresponding timeline).
Whether transitions should be automatically added to the layer
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
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 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 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 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 layer to the given priority. See #GESLayer:priority.
The priority to set
Sets a property on an object.
the name of the property to set
the value
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 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.
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.
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.
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
#GESLayer-s are responsible for collecting and ordering #GESClip-s.
A layer within a timeline will have an associated priority, corresponding to their index within the timeline. A layer with the index/priority 0 will have the highest priority and the layer with the largest index will have the lowest priority (the order of priorities, in this sense, is the reverse of the numerical ordering of the indices). ges_timeline_move_layer() should be used if you wish to change how layers are prioritised in a timeline.
Layers with higher priorities will have their content priorities over content from lower priority layers, similar to how layers are used in image editing. For example, if two separate layers both display video content, then the layer with the higher priority will have its images shown first. The other layer will only have its image shown if the higher priority layer has no content at the given playtime, or is transparent in some way. Audio content in separate layers will simply play in addition.