Table of Contents

Class AlphaCombineBlock

Namespace
VisioForge.Core.MediaBlocks.VideoProcessing
Assembly
VisioForge.Core.dll

Alpha combine block that merges a video stream with a separate alpha channel stream into a single video stream with transparency information. This block takes two input streams (one for RGB/YUV color data and one for alpha channel) and combines them into RGBA/YUVA output. Essential for compositing separate color and alpha streams into transparent video.

Supported features: Combining separate color and alpha streams into RGBA/YUVA

Use cases: Video compositing, merging decoded color and alpha streams, custom alpha processing

Implements the VisioForge.Core.MediaBlocks.MediaBlock. Implements the VisioForge.Core.MediaBlocks.IMediaBlockInternals. Implements the IDisposable. 
public class AlphaCombineBlock : MediaBlock, IMediaBlock, IDisposable, IMediaBlockInternals

Inheritance

Implements

Inherited Members

Extension Methods

Constructors

AlphaCombineBlock()

Initializes a new instance of the VisioForge.Core.MediaBlocks.VideoProcessing.AlphaCombineBlock class. This constructor creates an alpha combine block that merges color and alpha streams.

public AlphaCombineBlock()

Properties

AlphaInput

Gets the alpha input pad that accepts the alpha channel stream.

public MediaBlockPad AlphaInput { get; }

Property Value

MediaBlockPad

Input

Gets the primary input pad for receiving the color video stream.

public override MediaBlockPad Input { get; }

Property Value

MediaBlockPad

Inputs

Gets all input pads available on this block.

public override MediaBlockPad[] Inputs { get; }

Property Value

MediaBlockPad[]

Output

Gets the primary output pad that provides the combined RGBA/YUVA stream.

public override MediaBlockPad Output { get; }

Property Value

MediaBlockPad

Outputs

Gets all output pads available on this block.

public override MediaBlockPad[] Outputs { get; }

Property Value

MediaBlockPad[]

Type

Gets the media block type identifier for this alpha combine block.

public override MediaBlockType Type { get; }

Property Value

MediaBlockType

Methods

Build()

Builds and initializes the alpha combine element within the pipeline, creating the necessary GStreamer elements and configuring the pads.

public override bool Build()

Returns

bool

true if the block was successfully built and initialized; false if an error occurred.

CleanUp()

Performs cleanup of internal resources, disposing of the element and resetting the build state.

public void CleanUp()

Dispose(bool)

Releases unmanaged and - optionally - managed resources.

protected override void Dispose(bool disposing)

Parameters

disposing bool

true to release both managed and unmanaged resources; false to release only unmanaged resources.

GetCore()

Gets the underlying GStreamer element for advanced configuration and control.

public BaseElement GetCore()

Returns

BaseElement

The core alpha combine element instance.

GetElement()

Gets the native GStreamer element for direct manipulation and advanced use cases.

public Element GetElement()

Returns

Element

The underlying GStreamer alpha combine element.

IsAvailable()

Determines whether the alpha combine element is available on the current system. This method checks for the presence of the alphacombine GStreamer element. Ensure the appropriate GStreamer codec alpha plugin is installed.

public static bool IsAvailable()

Returns

bool

true if the element is available and can be used; otherwise, false.

IMediaBlockInternals.SetContext(MediaBlocksPipeline)

Sets the pipeline context for this block, establishing the connection to the parent pipeline and enabling access to shared resources.

void IMediaBlockInternals.SetContext(MediaBlocksPipeline pipeline)

Parameters

pipeline MediaBlocksPipeline

The parent MediaBlocksPipeline that contains this block.

See Also