Struct gstreamer::Element

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pub struct Element(_, _);

[−] 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 glib::List 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::get_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 ElementExt::iterate_pads.

Elements can be linked through their pads. If the link is straightforward, use the ElementExt::link convenience function to link two elements, or ElementExt::link_many for more elements in a row. Use ElementExt::link_filtered to link two elements constrained by a specified set of Caps. For finer control, use ElementExt::link_pads and ElementExt::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 Element::get_state and Element::set_state. Setting a state triggers a StateChange. To get a string representation of a State, use Element::state_get_name.

You can get and set a Clock on an element using ElementExt::get_clock and ElementExt::set_clock. Some elements can provide a clock for the pipeline if the ElementFlags::ProvideClock 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::RequireClock() 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.

Implements

ElementExt, GstObjectExt, glib::object::ObjectExt

Methods

impl Element[−]

pub fn make_from_uri(
    type_: URIType,
    uri: &str,
    elementname: Option<&str>
) -> Result<Element, Error>[−]

Creates an element for handling the given URI.

type_

Whether to create a source or a sink

uri

URI to create an element for

elementname

Name of created element, can be None.

Returns

a new element or None if none could be created

impl Element[−]

pub fn link_many<E: IsA<Element>>(elements: &[&E]) -> Result<(), BoolError>

pub fn unlink_many<E: IsA<Element>>(elements: &[&E])

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

true, if the registering succeeded, false on error

Trait Implementations

impl Clone for Element[+]

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fn clone(&self) -> Element[−]

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)[−]

Performs copy-assignment from source.

impl Debug for Element[+]

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fn fmt(&self, f: &mut Formatter) -> Result[−]

Formats the value using the given formatter.

impl Eq for Element

impl Hash for Element[+]

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fn hash<__H: Hasher>(&self, state: &mut __H)[−]

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, [−]

Feeds a slice of this type into the given [Hasher].

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 Ord for Element[+]

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fn cmp(&self, other: &Element) -> Ordering[−]

This method returns an [Ordering] between self and other.

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#[must_use] fn max(self, other: Self) -> Self[−]

Compares and returns the maximum of two values.

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#[must_use] fn min(self, other: Self) -> Self[−]

Compares and returns the minimum of two values.

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#[must_use] fn clamp(self, min: Self, max: Self) -> Self[−]

🔬 This is a nightly-only experimental API. (clamp)

Restrict a value to a certain interval.

impl<T: ObjectType> PartialEq<T> for Element[+]

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fn eq(&self, other: &T) -> bool[−]

This method tests for self and other values to be equal, and is used by ==.

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#[must_use] fn ne(&self, other: &Rhs) -> bool[−]

This method tests for !=.

impl<T: ObjectType> PartialOrd<T> for Element[+]

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fn partial_cmp(&self, other: &T) -> Option<Ordering>[−]

This method returns an ordering between self and other values if one exists.

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#[must_use] fn lt(&self, other: &Rhs) -> bool[−]

This method tests less than (for self and other) and is used by the < operator.

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#[must_use] fn le(&self, other: &Rhs) -> bool[−]

This method tests less than or equal to (for self and other) and is used by the <= operator.

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#[must_use] fn gt(&self, other: &Rhs) -> bool[−]

This method tests greater than (for self and other) and is used by the > operator.

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#[must_use] fn ge(&self, other: &Rhs) -> bool[−]

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Send for Element

impl StaticType for Element[+]

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fn static_type() -> Type[−]

Returns the type identifier of Self.

impl Sync for Element