Class Vp8Encoder

Encodes pictures as VP8 frames, RFC 6386, in pure C#: keyframes, every macroblock predicted from its edges by DC, and inter frames between them, every macroblock predicted from the previous picture at the same place and skipped when nothing is left to code; one quantizer, the default probabilities and no loop filter.

Inheritance

object

Vp8Encoder

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: Uniform.Matrix.Video.Vp8

Assembly: Uniform.Matrix.Video.dll

Syntax

public sealed class Vp8Encoder

Remarks

The encoder predicts and reconstructs as a decoder does, with Vp8Decoder's inverse transforms, so its Reconstruction is the picture every decoder shows and the reference of the next inter frame. A keyframe comes every KeyframeInterval frames, and after RequestKeyframe(), e.g. when the peer lost packets.

Constructors

Vp8Encoder(int)

Create an encoder of quantizer index quantizer, 0 for the finest to 127 for the coarsest.

Declaration

public Vp8Encoder(int quantizer = 40)

Parameters

Type	Name	Description
int	quantizer

Properties

KeyframeInterval

Frames from one keyframe to the next; 0 makes every frame a keyframe.

Declaration

public int KeyframeInterval { get; set; }

Property Value

Type	Description
int

MotionSearch

Whether inter frames search for motion: each macroblock may predict from a place moved by an even number of whole pixels, so its chroma moves by whole pixels too. Off predicts every macroblock from the same place.

Declaration

public bool MotionSearch { get; set; }

Property Value

Type	Description
bool

Quantizer

The quantizer index of the next frames, 0 to 127: higher makes smaller frames of lower quality.

Declaration

public int Quantizer { get; set; }

Property Value

Type	Description
int

Reconstruction

The last frame as decoders show it.

Declaration

public VideoFrame Reconstruction { get; }

Property Value

Type	Description
VideoFrame

Methods

Encode(VideoFrame)

Encode picture: a keyframe at the start, when asked, after KeyframeInterval frames or a change of size; else an inter frame. Return the frame.

Declaration

public byte[] Encode(VideoFrame picture)

Parameters

Type	Name	Description
VideoFrame	picture

Returns

Type	Description
byte[]

RequestKeyframe()

Make the next frame a keyframe.

Declaration

public void RequestKeyframe()