Class NVMPEG4DecoderBlock

Namespace

VisioForge.Core.MediaBlocks.VideoDecoders

Assembly

VisioForge.Core.dll

NVIDIA hardware-accelerated MPEG-4 Part 2 video decoder block using NVDEC technology. This block leverages NVIDIA GPU hardware decoding capabilities to efficiently decode MPEG-4 Part 2 video streams (including DivX and XviD) with minimal CPU usage. Supports Simple Profile and Advanced Simple Profile, commonly used in older video files and some streaming applications.

Hardware requirements: NVIDIA GPU with NVDEC support (most modern NVIDIA GPUs)

Supported profiles: Simple Profile, Advanced Simple Profile (ASP), supports B-frames and GMC

Performance: Hardware acceleration provides efficient decoding of SD and HD content

Use cases: Legacy video files, DivX/XviD content, older streaming formats, video archives

Implements the VisioForge.Core.MediaBlocks.MediaBlock. Implements the VisioForge.Core.MediaBlocks.IMediaBlockInternals. Implements the IDisposable.

public class NVMPEG4DecoderBlock : MediaBlock, IMediaBlock, IDisposable, IMediaBlockInternals

Inheritance

object

MediaBlock

NVMPEG4DecoderBlock

Implements

IMediaBlock

IDisposable

IMediaBlockInternals

Inherited Members

MediaBlock._isBuilt

MediaBlock._pipeline

MediaBlock._pipelineCtx

MediaBlock.GetPipelineContext()

MediaBlock.SetPipelineContext(BlockPipelineContext)

MediaBlock.SetPipeline(MediaBlocksPipeline)

MediaBlock.Context

MediaBlock.Name

MediaBlock.IsBuilt

MediaBlock.Owner

MediaBlock.Type

MediaBlock.ID

MediaBlock.Input

MediaBlock.Inputs

MediaBlock.Output

MediaBlock.Outputs

MediaBlock.HasInputs

MediaBlock.HasOutputs

MediaBlock.Build()

MediaBlock.CreateElements()

MediaBlock.AddElementsToPipeline()

MediaBlock.RemoveElementsFromPipeline()

MediaBlock.DeepCopy(string)

MediaBlock.Reset()

MediaBlock.ToYAMLBlock()

MediaBlock.ClearPads()

MediaBlock.Dispose(bool)

MediaBlock.Dispose()

object.Equals(object?)

object.Equals(object?, object?)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object?, object?)

object.ToString()

Extension Methods

MediaBlockExtensions.GetInputPadByType(IMediaBlock, MediaBlockPadMediaType)

MediaBlockExtensions.GetOutputPadByType(IMediaBlock, MediaBlockPadMediaType)

MediaBlockHelper.SendEndOfStream(MediaBlock)

MediaBlockHelper.SendEvent(MediaBlock, Event)

MediaBlockHelper.SetState(MediaBlock, State)

Constructors

NVMPEG4DecoderBlock()

Initializes a new instance of the VisioForge.Core.MediaBlocks.VideoDecoders.NVMPEG4DecoderBlock class. The decoder requires an NVIDIA GPU with NVDEC support and appropriate drivers installed.

public NVMPEG4DecoderBlock()

Properties

Input

Gets the primary input pad for receiving MPEG-4 Part 2 encoded video data.

public override MediaBlockPad Input { get; }

Property Value

MediaBlockPad

Inputs

Gets all input pads available on this hardware decoder block.

public override MediaBlockPad[] Inputs { get; }

Property Value

MediaBlockPad[]

Output

Gets the primary output pad that provides hardware-decoded video frames.

public override MediaBlockPad Output { get; }

Property Value

MediaBlockPad

Outputs

Gets all output pads available on this hardware decoder block.

public override MediaBlockPad[] Outputs { get; }

Property Value

MediaBlockPad[]

Type

Gets the media block type identifier for this NVIDIA MPEG-4 hardware decoder.

public override MediaBlockType Type { get; }

Property Value

MediaBlockType

Methods

Build()

Builds and initializes the NVIDIA hardware decoder within the pipeline, allocating GPU resources and configuring NVDEC for MPEG-4 Part 2 decoding.

public override bool Build()

Returns

bool

true if the hardware decoder was successfully initialized; false if GPU resources are unavailable.

CleanUp()

Performs cleanup of GPU resources, releasing NVDEC hardware decoder and freeing allocated GPU memory.

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 NVDEC element for advanced GPU configuration.

public BaseElement GetCore()

Returns

BaseElement

The core NVIDIA MPEG-4 Part 2 hardware decoder element instance.

GetElement()

Gets the native GStreamer NVDEC element for direct hardware manipulation.

public Element GetElement()

Returns

Element

The underlying GStreamer NVIDIA MPEG-4 decoder element.

IsAvailable()

Determines whether NVIDIA hardware MPEG-4 Part 2 decoding is available on the current system. This method checks for compatible NVIDIA GPU hardware, NVDEC support, and required drivers. Ensure the NVIDIA Video Codec SDK redistribution package is included in your project.

public static bool IsAvailable()

Returns

bool

true if NVIDIA MPEG-4 Part 2 hardware decoding is available; otherwise, false.

IMediaBlockInternals.SetContext(MediaBlocksPipeline)

Sets the pipeline context for this hardware decoder block, establishing GPU resource management and pipeline integration.

void IMediaBlockInternals.SetContext(MediaBlocksPipeline pipeline)

Parameters

pipeline MediaBlocksPipeline

The parent MediaBlocksPipeline that manages GPU resources.

See Also

MediaBlock

IMediaBlockInternals

IDisposable