Struct gstreamer::GhostPad

source ·
#[repr(transparent)]
pub struct GhostPad { /* private fields */ }
Expand description

GhostPads are useful when organizing pipelines with Bin like elements. The idea here is to create hierarchical element graphs. The bin element contains a sub-graph. Now one would like to treat the bin-element like any other Element. This is where GhostPads come into play. A GhostPad acts as a proxy for another pad. Thus the bin can have sink and source ghost-pads that are associated with sink and source pads of the child elements.

If the target pad is known at creation time, with_target() is the function to use to get a ghost-pad. Otherwise one can use new() to create the ghost-pad and use GhostPadExt::set_target() to establish the association later on.

Note that GhostPads add overhead to the data processing of a pipeline.

Implements

GhostPadExt, ProxyPadExt, PadExt, GstObjectExt, glib::ObjectExt, [ProxyPadExtManual][trait@crate::prelude::ProxyPadExtManual], PadExtManual

Implementations

Invoke the default activate mode function of a ghost pad.

pad

the Pad to activate or deactivate.

parent

the parent of pad or None

mode

the requested activation mode

active

whether the pad should be active or not.

Returns

true if the operation was successful.

Invoke the default activate mode function of a proxy pad that is owned by a ghost pad.

pad

the Pad to activate or deactivate.

parent

the parent of pad or None

mode

the requested activation mode

active

whether the pad should be active or not.

Returns

true if the operation was successful.

Create a new ghostpad without a target with the given direction. A target can be set on the ghostpad later with the GhostPadExt::set_target() function.

The created ghostpad will not have a padtemplate.

name

the name of the new pad, or None to assign a default name.

dir

the direction of the ghostpad

Returns

a new Pad, or None in case of an error.

Create a new ghostpad based on templ, without setting a target. The direction will be taken from the templ.

name

the name of the new pad, or None to assign a default name

templ

the PadTemplate to create the ghostpad from.

Returns

a new Pad, or None in case of an error.

Create a new ghostpad with target as the target. The direction will be taken from the target pad. target must be unlinked.

Will ref the target.

name

the name of the new pad, or None to assign a default name

target

the pad to ghost.

Returns

a new Pad, or None in case of an error.

Create a new ghostpad with target as the target. The direction will be taken from the target pad. The template used on the ghostpad will be template.

Will ref the target.

name

the name of the new pad, or None to assign a default name.

target

the pad to ghost.

templ

the PadTemplate to use on the ghostpad.

Returns

a new Pad, or None in case of an error.

Trait Implementations

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