GstAlphaDecodeBin 

GObject
    ╰──GInitiallyUnowned
        ╰──GstObject
            ╰──GstElement
                ╰──GstBin
                    ╰──GstAlphaDecodeBin

Base class for alpha decode bin wrapper elements.

Members

parent_instance (GstBin) –

Parent instance.

Since : 1.30

Class structure

GstAlphaDecodeBinClass

Base class for bins that decode streams with encoded alpha data by demuxing, decoding the color and alpha streams separately, and combining the decoded output.

Subclasses must add their own sink pad template. For each GstAlphaDecodeBinRole, subclasses can either create an element from create_role_element or configure a fallback factory name with gst_alpha_decode_bin_class_set_role_factory_name.

Fields
parent_class (GstBinClass) –

Parent class.

Since : 1.30

GstVideo.AlphaDecodeBinClass

Base class for bins that decode streams with encoded alpha data by demuxing, decoding the color and alpha streams separately, and combining the decoded output.

Subclasses must add their own sink pad template. For each GstVideo.AlphaDecodeBinRole, subclasses can either create an element from create_role_element or configure a fallback factory name with GstVideo.AlphaDecodeBinClass.prototype.set_role_factory_name.

Attributes
parent_class (Gst.BinClass) –

Parent class.

Since : 1.30

GstVideo.AlphaDecodeBinClass

Base class for bins that decode streams with encoded alpha data by demuxing, decoding the color and alpha streams separately, and combining the decoded output.

Subclasses must add their own sink pad template. For each GstVideo.AlphaDecodeBinRole, subclasses can either create an element from create_role_element or configure a fallback factory name with GstVideo.AlphaDecodeBinClass.set_role_factory_name.

Attributes
parent_class (Gst.BinClass) –

Parent class.

Since : 1.30

GstVideo.AlphaDecodeBin 

GObject.Object
    ╰──GObject.InitiallyUnowned
        ╰──Gst.Object
            ╰──Gst.Element
                ╰──Gst.Bin
                    ╰──GstVideo.AlphaDecodeBin

Base class for alpha decode bin wrapper elements.

Members

parent_instance (Gst.Bin) –

Parent instance.

Since : 1.30

GstVideo.AlphaDecodeBin 

GObject.Object
    ╰──GObject.InitiallyUnowned
        ╰──Gst.Object
            ╰──Gst.Element
                ╰──Gst.Bin
                    ╰──GstVideo.AlphaDecodeBin

Base class for alpha decode bin wrapper elements.

Members

parent_instance (Gst.Bin) –

Parent instance.

Since : 1.30

Class Methods

gst_alpha_decode_bin_class_set_role_factory_name 

gst_alpha_decode_bin_class_set_role_factory_name (GstAlphaDecodeBinClass * klass,
                                                  GstAlphaDecodeBinRole role,
                                                  const gchar * factory_name)

Sets the element factory name to use for role when constructing instances of klass.

This is usually called from a subclass' class init function. The configured factory name is used when the subclass does not implement create_role_element, or when that vfunc returns NULL without setting an error.

Parameters:

klass –

a GstAlphaDecodeBinClass

role –

a GstAlphaDecodeBinRole

factory_name ( [nullable]) –

element factory name to use for role, or NULL to unset the configured factory

Since : 1.30

GstVideo.AlphaDecodeBinClass.prototype.set_role_factory_name 

function GstVideo.AlphaDecodeBinClass.prototype.set_role_factory_name(klass: GstVideo.AlphaDecodeBinClass, role: GstVideo.AlphaDecodeBinRole, factory_name: String): {
    // javascript wrapper for 'gst_alpha_decode_bin_class_set_role_factory_name'
}

Sets the element factory name to use for role when constructing instances of klass.

This is usually called from a subclass' class init function. The configured factory name is used when the subclass does not implement vfunc_create_role_element, or when that vfunc returns null without setting an error.

Parameters:

a GstVideo.AlphaDecodeBinClass

a GstVideo.AlphaDecodeBinRole

factory_name (String) –

element factory name to use for role, or null to unset the configured factory

Since : 1.30

Virtual Methods

create_role_element 

GstElement *
create_role_element (GstAlphaDecodeBin * self,
                     GstAlphaDecodeBinRole role,
                     const GstCaps * input_caps,
                     GError ** error)

Called when constructing the internal pipeline to let subclasses create an element for the requested GstAlphaDecodeBinRole. Subclasses can use input_caps to select role elements for the encoded stream before data flow starts. If the vfunc returns NULL without setting error, the factory name configured with gst_alpha_decode_bin_class_set_role_factory_name is used as fallback. If the vfunc returns NULL and sets error, construction fails. If the vfunc returns an element and sets error, the error is logged as a warning and ignored.

Parameters:

self –

a GstAlphaDecodeBin

role –

a GstAlphaDecodeBinRole

input_caps ( [nullable]) –

upstream caps allowed on the alpha decode bin sink pad

error ( [out][optional]) –

return location for a GError

Returns ( [transfer: full][nullable]) –

a role element, or NULL to use the configured fallback factory

Since : 1.30

vfunc_create_role_element 

function vfunc_create_role_element(self: GstVideo.AlphaDecodeBin, role: GstVideo.AlphaDecodeBinRole, input_caps: Gst.Caps): {
    // javascript implementation of the 'create_role_element' virtual method
}

Called when constructing the internal pipeline to let subclasses create an element for the requested GstVideo.AlphaDecodeBinRole. Subclasses can use input_caps to select role elements for the encoded stream before data flow starts. If the vfunc returns null without setting error, the factory name configured with GstVideo.AlphaDecodeBinClass.prototype.set_role_factory_name is used as fallback. If the vfunc returns null and sets error, construction fails. If the vfunc returns an element and sets error, the error is logged as a warning and ignored.

Parameters:

a GstVideo.AlphaDecodeBin

a GstVideo.AlphaDecodeBinRole

input_caps (Gst.Caps) –

upstream caps allowed on the alpha decode bin sink pad

Returns (Gst.Element) –

a role element, or null to use the configured fallback factory

Since : 1.30

do_create_role_element 

def do_create_role_element (self, role, input_caps):
    #python implementation of the 'create_role_element' virtual method

Called when constructing the internal pipeline to let subclasses create an element for the requested GstVideo.AlphaDecodeBinRole. Subclasses can use input_caps to select role elements for the encoded stream before data flow starts. If the vfunc returns None without setting error, the factory name configured with GstVideo.AlphaDecodeBinClass.set_role_factory_name is used as fallback. If the vfunc returns None and sets error, construction fails. If the vfunc returns an element and sets error, the error is logged as a warning and ignored.

Parameters:

a GstVideo.AlphaDecodeBin

a GstVideo.AlphaDecodeBinRole

input_caps (Gst.Caps) –

upstream caps allowed on the alpha decode bin sink pad

Returns (Gst.Element) –

a role element, or None to use the configured fallback factory

Since : 1.30

Enumerations

GstAlphaDecodeBinRole

The element roles used to construct a GstAlphaDecodeBin subclass.

Members
GST_ALPHA_DECODE_BIN_ROLE_DEMUX (0) –

the element that separates the encoded color stream from the encoded alpha stream

GST_ALPHA_DECODE_BIN_ROLE_COLOR_DECODER (1) –

the decoder for the encoded color stream

GST_ALPHA_DECODE_BIN_ROLE_ALPHA_DECODER (2) –

the decoder for the encoded alpha stream

GST_ALPHA_DECODE_BIN_ROLE_COMBINE (3) –

the element that combines decoded color and alpha streams into one decoded stream

GST_ALPHA_DECODE_BIN_ROLE_COUNT (4) –

the number of alpha decode bin roles

Since : 1.30

GstVideo.AlphaDecodeBinRole

The element roles used to construct a GstVideo.AlphaDecodeBin subclass.

Members
GstVideo.AlphaDecodeBinRole.DEMUX (0) –

the element that separates the encoded color stream from the encoded alpha stream

GstVideo.AlphaDecodeBinRole.COLOR_DECODER (1) –

the decoder for the encoded color stream

GstVideo.AlphaDecodeBinRole.ALPHA_DECODER (2) –

the decoder for the encoded alpha stream

GstVideo.AlphaDecodeBinRole.COMBINE (3) –

the element that combines decoded color and alpha streams into one decoded stream

GstVideo.AlphaDecodeBinRole.COUNT (4) –

the number of alpha decode bin roles

Since : 1.30

GstVideo.AlphaDecodeBinRole

The element roles used to construct a GstVideo.AlphaDecodeBin subclass.

Members
GstVideo.AlphaDecodeBinRole.DEMUX (0) –

the element that separates the encoded color stream from the encoded alpha stream

GstVideo.AlphaDecodeBinRole.COLOR_DECODER (1) –

the decoder for the encoded color stream

GstVideo.AlphaDecodeBinRole.ALPHA_DECODER (2) –

the decoder for the encoded alpha stream

GstVideo.AlphaDecodeBinRole.COMBINE (3) –

the element that combines decoded color and alpha streams into one decoded stream

GstVideo.AlphaDecodeBinRole.COUNT (4) –

the number of alpha decode bin roles

Since : 1.30

Constants

GST_ALPHA_DECODE_BIN_RANK_OFFSET 

#define GST_ALPHA_DECODE_BIN_RANK_OFFSET 10

Rank offset for alpha decode bin wrappers.

When wrapping a decoder, use the original decoder rank plus this offset. The offset is large enough to let an alpha wrapper outrank small rank adjustments used by hardware decoders, while keeping lower-ranked wrappers below the primary rank threshold.

Since : 1.30

GstVideo.ALPHA_DECODE_BIN_RANK_OFFSET

Rank offset for alpha decode bin wrappers.

When wrapping a decoder, use the original decoder rank plus this offset. The offset is large enough to let an alpha wrapper outrank small rank adjustments used by hardware decoders, while keeping lower-ranked wrappers below the primary rank threshold.

Since : 1.30

GstVideo.ALPHA_DECODE_BIN_RANK_OFFSET

Rank offset for alpha decode bin wrappers.

When wrapping a decoder, use the original decoder rank plus this offset. The offset is large enough to let an alpha wrapper outrank small rank adjustments used by hardware decoders, while keeping lower-ranked wrappers below the primary rank threshold.

Since : 1.30

GST_TYPE_ALPHA_DECODE_BIN 

#define GST_TYPE_ALPHA_DECODE_BIN (gst_alpha_decode_bin_get_type())

The GType for GstAlphaDecodeBin.

Since : 1.30

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