Table of Contents

Class AMAScalerBlock

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

AMD AMA (Alveo MA35D) hardware video scaler block for Linux systems. This block resizes video (and optionally halves the frame rate) on the AMD MA35D media accelerator. The scaling runs entirely in device memory; the block wraps the ama_scaler element in the chain ama_upload ! ama_scaler ! capsfilter ! ama_download so it accepts system-memory frames on its input and hands system-memory frames downstream. Requires the AMD AMA Video SDK (kernel driver + GStreamer plugins) to be installed. Implements the VisioForge.Core.MediaBlocks.MediaBlock. Implements the VisioForge.Core.MediaBlocks.IMediaBlockInternals. Implements the IDisposable.

public class AMAScalerBlock : MediaBlock, IMediaBlock, IDisposable, IMediaBlockInternals

Inheritance

Implements

Inherited Members

Extension Methods

Constructors

AMAScalerBlock(AMAScalerSettings)

Initializes a new instance of the VisioForge.Core.MediaBlocks.AMAScalerBlock class with the specified settings.

public AMAScalerBlock(AMAScalerSettings settings)

Parameters

settings AMAScalerSettings

The scaler settings (output size, device, frame-rate mode).

Properties

Input

Gets the input.

public override MediaBlockPad Input { get; }

Property Value

MediaBlockPad

Inputs

Gets the inputs.

public override MediaBlockPad[] Inputs { get; }

Property Value

MediaBlockPad[]

Output

Gets the output.

public override MediaBlockPad Output { get; }

Property Value

MediaBlockPad

Outputs

Gets the outputs.

public override MediaBlockPad[] Outputs { get; }

Property Value

MediaBlockPad[]

Settings

Gets or sets the scaler settings (output size, device, frame-rate mode).

public AMAScalerSettings Settings { get; set; }

Property Value

AMAScalerSettings

Type

Gets the type.

public override MediaBlockType Type { get; }

Property Value

MediaBlockType

Methods

Build()

Constructs and initializes the AMA scaler chain within the pipeline and wires the block pads.

public override bool Build()

Returns

bool

true if the scaler was successfully built and configured; false if initialization failed.

CleanUp()

Releases all resources and performs cleanup operations for this AMA scaler block.

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 core BaseElement wrapper that encapsulates the AMA scaler chain.

public BaseElement GetCore()

Returns

BaseElement

The BaseElement wrapper instance.

GetElement()

Gets the underlying GStreamer input element (ama_upload) of the scaler chain.

public Element GetElement()

Returns

Element

The GStreamer Element instance.

IsAvailable()

Determines whether this media block is available. Correct NuGet SDK redist should be included into your project.

public static bool IsAvailable()

Returns

bool

true if the ama_upload, ama_scaler and ama_download elements are present; otherwise, false.

IMediaBlockInternals.SetContext(MediaBlocksPipeline)

Associates this AMA scaler block with a pipeline and initializes its internal context. This method is called internally when the block is added to a pipeline.

void IMediaBlockInternals.SetContext(MediaBlocksPipeline pipeline)

Parameters

pipeline MediaBlocksPipeline

The MediaBlocksPipeline instance that will manage this block.

See Also