Class Nalu

An H265 Network Abstraction Layer Unit.

Inheritance

System.Object

Nalu

Namespace: FM.LiveSwitch.H265

Assembly: FM.LiveSwitch.dll

Syntax

public class Nalu : object

Constructors

Nalu()

Creates an empty NAL Unit.

Declaration

public Nalu()

Nalu(DataBuffer)

Creates a NAL Unit from a byte array.

Declaration

public Nalu(DataBuffer naluBytes)

Parameters

Type	Name	Description
DataBuffer	naluBytes	The NALU bytes.

Properties

Buffer

Gets the backing DataBuffer.

Declaration

public DataBuffer Buffer { get; }

Property Value

Type	Description
DataBuffer

FBit

Gets the forbidden Zero Bit. The H.265 specification declares a value of 1 as a syntax violation.

Declaration

public bool FBit { get; }

Property Value

Type	Description
System.Boolean

FBitMask

Gets the forbidden zero bit mask.

Declaration

public static int FBitMask { get; }

Property Value

Type	Description
System.Int32

FirstSliceSegmentInPicFlag

Gets the first_slice_segment_in_pic_flag

Declaration

protected bool FirstSliceSegmentInPicFlag { get; }

Property Value

Type	Description
System.Boolean

LayerId

Gets the LayerId: 6bits otherwise known as nuh_layer_id.

Declaration

public int LayerId { get; }

Property Value

Type	Description
System.Int32

LayerIdMask

Gets the Layer Id (nuh_layer_id) mask.

Declaration

public static int LayerIdMask { get; }

Property Value

Type	Description
System.Int32

Payload

Gets the NAL payload.

Declaration

public DataBuffer Payload { get; }

Property Value

Type	Description
DataBuffer

ShortLength

Gets the size of the NAL Unit (including NAL header) in two octets stored in the returned byte array. Useful for creating H265 aggregation packets.

Declaration

public DataBuffer ShortLength { get; }

Property Value

Type	Description
DataBuffer

StartCode

Gets the 4-byte NALU start code.

Declaration

public static DataBuffer StartCode { get; }

Property Value

Type	Description
DataBuffer

Tid

Gets the TID: 3bits otherwise known as nuh_temporal_plus1.

Declaration

public int Tid { get; }

Property Value

Type	Description
System.Int32

TidMask

Gets the TID (nuh_temporal_id_plus1) mask.

Declaration

public static int TidMask { get; }

Property Value

Type	Description
System.Int32

Type

Gets the NAL Unit Type.

Declaration

public int Type { get; }

Property Value

Type	Description
System.Int32

TypeMask

Gets the NAL Unit Type (nal_unit_type) mask.

Declaration

public static int TypeMask { get; }

Property Value

Type	Description
System.Int32

Methods

FindNalu(DataBuffer)

Scans for the index of the first NAL Unit after start.

Declaration

public static int FindNalu(DataBuffer encodedData)

Parameters

Type	Name	Description
DataBuffer	encodedData	The stream to search.

Returns

Type	Description
System.Int32

FindNextNalu(DataBuffer, Int32)

Scans for the index of the first NAL Unit after start.

Declaration

public static int FindNextNalu(DataBuffer encodedData, int start)

Parameters

Type	Name	Description
DataBuffer	encodedData	The stream to search.
System.Int32	start	The index to start searching from.

Returns

Type	Description
System.Int32

GetBytes()

Gets the NAL Unit as a byte array that can be passed to an encoder (includes Start Code).

Declaration

public DataBuffer GetBytes()

Returns

Type	Description
DataBuffer

GetNalu(DataBuffer)

Returns the first NAL unit after nalStart.

Declaration

public static Nalu GetNalu(DataBuffer encodedData)

Parameters

Type	Name	Description
DataBuffer	encodedData	The byte array to search.

Returns

Type	Description
Nalu

GetNalu(DataBuffer, Int32, out Int32)

Returns the first NAL unit after nalStart.

Declaration

public static Nalu GetNalu(DataBuffer encodedData, int nalStart, out int nextStartCodeLength)

Parameters

Type	Name	Description
DataBuffer	encodedData	The byte array to search.
System.Int32	nalStart	The start index of the NAL.
System.Int32	nextStartCodeLength	OUT The length of the next the NAL startcode.

Returns

Type	Description
Nalu