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WICJpegScanHeader structure (wincodec.h)

  • Article

Represents a JPEG frame header.

Syntax

typedef struct WICJpegScanHeader {
  UINT  cComponents;
  UINT  RestartInterval;
  DWORD ComponentSelectors;
  DWORD HuffmanTableIndices;
  BYTE  StartSpectralSelection;
  BYTE  EndSpectralSelection;
  BYTE  SuccessiveApproximationHigh;
  BYTE  SuccessiveApproximationLow;
} WICJpegScanHeader;

Members

cComponents

The number of components in the scan.

RestartInterval

The interval of reset markers within the scan.

ComponentSelectors

The component identifiers.

HuffmanTableIndices

The format of the quantization table indices. Use one of the following constants, described in IWICJpegFrameDecode Constants.

  • WIC_JPEG_HUFFMAN_BASELINE_ONE
  • WIC_JPEG_HUFFMAN_BASELINE_THREE

StartSpectralSelection

The start of the spectral selection.

EndSpectralSelection

The end of the spectral selection.

SuccessiveApproximationHigh

The successive approximation high.

SuccessiveApproximationLow

The successive approximation low.

Remarks

Get the scan header for an image by calling IWICJpegFrameDecode::GetScanHeader.

Requirements

Requirement Value
Header wincodec.h