#[repr(transparent)]pub struct Element { /* private fields */ }
Expand description
GstElement is the abstract base class needed to construct an element that
can be used in a GStreamer pipeline. Please refer to the plugin writers
guide for more information on creating Element
subclasses.
The name of a Element
can be get with gst_element_get_name()
and set with
gst_element_set_name()
. For speed, GST_ELEMENT_NAME() can be used in the
core when using the appropriate locking. Do not use this in plug-ins or
applications in order to retain ABI compatibility.
Elements can have pads (of the type Pad
). These pads link to pads on
other elements. Buffer
flow between these linked pads.
A Element
has a GList
of Pad
structures for all their input (or sink)
and output (or source) pads.
Core and plug-in writers can add and remove pads with ElementExt::add_pad()
and ElementExt::remove_pad()
.
An existing pad of an element can be retrieved by name with
ElementExt::static_pad()
. A new dynamic pad can be created using
ElementExt::request_pad()
with a PadTemplate
.
An iterator of all pads can be retrieved with ElementExtManual::iterate_pads()
.
Elements can be linked through their pads.
If the link is straightforward, use the ElementExtManual::link()
convenience function to link two elements, or [ElementExtManual::link_many()
][crate::prelude::ElementExtManual::link_many()]
for more elements in a row.
Use ElementExtManual::link_filtered()
to link two elements constrained by
a specified set of Caps
.
For finer control, use ElementExtManual::link_pads()
and
ElementExtManual::link_pads_filtered()
to specify the pads to link on
each element by name.
Each element has a state (see State
). You can get and set the state
of an element with ElementExt::state()
and ElementExt::set_state()
.
Setting a state triggers a StateChange
. To get a string representation
of a State
, use gst_element_state_get_name()
.
You can get and set a Clock
on an element using ElementExt::clock()
and ElementExt::set_clock()
.
Some elements can provide a clock for the pipeline if
the ElementFlags::PROVIDE_CLOCK
flag is set. With the
ElementExt::provide_clock()
method one can retrieve the clock provided by
such an element.
Not all elements require a clock to operate correctly. If the
ElementFlags::REQUIRE_CLOCK
() flag is set, a clock should be set on the
element with ElementExt::set_clock()
.
Note that clock selection and distribution is normally handled by the
toplevel Pipeline
so the clock functions are only to be used in very
specific situations.
This is an Abstract Base Class, you cannot instantiate it.
Signals
no-more-pads
This signals that the element will not generate more dynamic pads. Note that this signal will usually be emitted from the context of the streaming thread.
pad-added
a new Pad
has been added to the element. Note that this signal will
usually be emitted from the context of the streaming thread. Also keep in
mind that if you add new elements to the pipeline in the signal handler
you will need to set them to the desired target state with
ElementExt::set_state()
or ElementExt::sync_state_with_parent()
.
pad-removed
a Pad
has been removed from the element
Object
deep-notify
The deep notify signal is used to be notified of property changes. It is typically attached to the toplevel bin to receive notifications from all the elements contained in that bin.
Detailed
Implements
Implementations§
source§impl Element
impl Element
source§impl Element
impl Element
pub fn link_many<E: IsA<Element>>(elements: &[&E]) -> Result<(), BoolError>
pub fn unlink_many<E: IsA<Element>>(elements: &[&E])
sourcepub fn register(
plugin: Option<&Plugin>,
name: &str,
rank: Rank,
type_: Type
) -> Result<(), BoolError>
pub fn register(
plugin: Option<&Plugin>,
name: &str,
rank: Rank,
type_: Type
) -> Result<(), BoolError>
Create a new elementfactory capable of instantiating objects of the
type_
and add the factory to plugin
.
plugin
Plugin
to register the element with, or None
for
a static element.
name
name of elements of this type
rank
rank of element (higher rank means more importance when autoplugging)
type_
GType of element to register
Returns
Trait Implementations§
source§impl HasParamSpec for Element
impl HasParamSpec for Element
source§impl<T: ElementImpl> IsSubclassable<T> for Element
impl<T: ElementImpl> IsSubclassable<T> for Element
source§fn class_init(klass: &mut Class<Self>)
fn class_init(klass: &mut Class<Self>)
source§fn instance_init(instance: &mut InitializingObject<T>)
fn instance_init(instance: &mut InitializingObject<T>)
source§impl Ord for Element
impl Ord for Element
source§impl<OT: ObjectType> PartialEq<OT> for Element
impl<OT: ObjectType> PartialEq<OT> for Element
source§impl<OT: ObjectType> PartialOrd<OT> for Element
impl<OT: ObjectType> PartialOrd<OT> for Element
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 Element
impl StaticType for Element
source§fn static_type() -> Type
fn static_type() -> Type
Self
.impl Eq for Element
impl IsA<Element> for Bin
impl IsA<Element> for Pipeline
impl IsA<Element> for TagSetter
impl IsA<Element> for TocSetter
impl IsA<Object> for Element
impl Send for Element
impl Sync for Element
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