Class Vp8Decoder

Decodes VP8 frames, RFC 6386, in pure C#: a port of the RFC's reference decoder, exact to libvpx, so that its test vectors decode bit for bit.

Inheritance
object
Vp8Decoder
Implements
Inherited Members
Namespace: Uniform.Matrix.Video.Vp8
Assembly: Uniform.Matrix.Video.dll
Syntax
public sealed class Vp8Decoder : IVideoDecoder, IDisposable
Remarks

Give the frames in order, starting with a keyframe; a frame that cannot be decoded throws InvalidDataException, after which decoding needs a keyframe again. Partial files:

  • Vp8Decoder.cs: state, frame headers, the macroblock row loop and the reference frames.
  • Vp8Decoder.Modes.cs: macroblock modes and motion vectors.
  • Vp8Decoder.Tokens.cs: DCT coefficients.
  • Vp8Decoder.Prediction.cs: intra and inter prediction, and adding the residual.
  • Vp8Decoder.LoopFilter.cs: the loop filter.

Methods

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Decode(ReadOnlySpan<byte>)

Decode one frame; return the picture when the frame is shown, or null for a frame only kept as a reference.

Declaration
public VideoFrame? Decode(ReadOnlySpan<byte> frame)
Parameters
Type Name Description
ReadOnlySpan<byte> frame
Returns
Type Description
VideoFrame
Exceptions
Type Condition
InvalidDataException

The frame is corrupt or unsupported, or no keyframe came first.
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Dispose()

Nothing to release: the decoder holds only managed memory.

Declaration
public void Dispose()

Implements