Struct gstreamer_editing_services::Group
source · #[repr(transparent)]pub struct Group { /* private fields */ }Expand description
A Group controls one or more Container-s (usually Clip-s,
but it can also control other Group-s). Its children must share
the same Timeline, but can otherwise lie in separate Layer-s
and have different timings.
To initialise a group, you may want to use Container::group(),
and similarly use GESContainerExt::ungroup() to dispose of it.
A group will maintain the relative start times of
its children, as well as their relative layer priority.
Therefore, if one of its children has its start
set, all other children will have their start
shifted by the same amount. Similarly, if one of its children moves to
a new layer, the other children will also change layers to maintain the
difference in their layer priorities. For example, if a child moves
from a layer with priority 1 to a layer with priority 3, then
another child that was in a layer with priority 0 will move to the
layer with priority 2.
The start of a group refers to the earliest start
time of its children. If the group’s start is set, all the
children will be shifted equally such that the earliest start time
will match the set value. The duration of a group is the
difference between the earliest start time and latest end time of its
children. If the group’s duration is increased, the children
whose end time matches the end of the group will be extended
accordingly. If it is decreased, then any child whose end time exceeds
the new end time will also have their duration decreased accordingly.
A group may span several layers, but for methods such as
TimelineElementExt::layer_priority() and
TimelineElementExt::edit() a group is considered to have a layer
priority that is the highest priority (numerically, the
smallest) of all the layers it spans.
Properties
duration
An overwrite of the duration property. For a
Group, this is the difference between the earliest
start time and the latest end time (given by
start + duration) amongst
its children.
Readable | Writeable
in-point
An overwrite of the in-point property. This has
no meaning for a group and should not be set.
Readable | Writeable
max-duration
An overwrite of the max-duration property. This
has no meaning for a group and should not be set.
Readable | Writeable | Construct
priority
An overwrite of the priority property.
Setting TimelineElement priorities is deprecated as all priority
management is now done by GES itself.
Readable | Writeable
start
An overwrite of the start property. For a
Group, this is the earliest start time
amongst its children.
Readable | Writeable
Container
height
The span of the container’s children’s priority
values, which is the number of integers that lie between (inclusive)
the minimum and maximum priorities found amongst the container’s
children (maximum - minimum + 1).
Readable
TimelineElement
duration
The duration that the element is in effect for in the timeline (a time difference in nanoseconds using the time coordinates of the timeline). For example, for a source element, this would determine for how long it should output its internal content for. For an operation element, this would determine for how long its effect should be applied to any source content.
Readable | Writeable
in-point
The initial offset to use internally when outputting content (in nanoseconds, but in the time coordinates of the internal content).
For example, for a VideoUriSource 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 start, it will begin outputting the
data from the timestamp in-point onwards, until it reaches the
end of its duration in the timeline.
For elements that have no internal content, this should be kept as 0.
Readable | Writeable
max-duration
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 in-point of the
element (which is in the same time coordinates), and will sometimes
be used to limit the duration of the element in
the timeline.
For example, for a VideoUriSource 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.
Readable | Writeable | Construct
name
The name of the element. This should be unique within its timeline.
Readable | Writeable | Construct
parent
The parent container of the element.
Readable | Writeable
priority
The priority of the element.
Readable | Writeable
serialize
Whether the element should be serialized.
Readable | Writeable
start
The starting position of the element in the timeline (in nanoseconds and in the time coordinates of the timeline). For example, for a source element, this would determine the time at which it should start outputting its internal content. For an operation element, this would determine the time at which it should start applying its effect to any source content.
Readable | Writeable
timeline
The timeline that the element lies within.
Readable | Writeable
Implements
GESContainerExt, TimelineElementExt, glib::ObjectExt, ExtractableExt, MetaContainerExt, [TimelineElementExtManual][trait@crate::prelude::TimelineElementExtManual]
Implementations§
Trait Implementations§
source§impl HasParamSpec for Group
impl HasParamSpec for Group
source§impl Ord for Group
impl Ord for Group
source§impl<OT: ObjectType> PartialEq<OT> for Group
impl<OT: ObjectType> PartialEq<OT> for Group
source§impl<OT: ObjectType> PartialOrd<OT> for Group
impl<OT: ObjectType> PartialOrd<OT> for Group
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self and other) and is used by the <=
operator. Read moresource§impl StaticType for Group
impl StaticType for Group
source§fn static_type() -> Type
fn static_type() -> Type
Self.impl Eq for Group
impl IsA<Container> for Group
impl IsA<Extractable> for Group
impl IsA<MetaContainer> for Group
impl IsA<TimelineElement> for Group
Auto Trait Implementations§
impl RefUnwindSafe for Group
impl !Send for Group
impl !Sync for Group
impl Unpin for Group
impl UnwindSafe for Group
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