NppiJpegFrameDescr Struct Reference

JPEG frame descriptor. More...

#include <nppi_compression_functions.h>

Data Fields
Npp8u	nComponents
	Number of components in frame. More...
NppiSize	oSizeInBlocks
	Size of component with 1x1 subsampling (usually luma) in DCT blocks. More...
NppiSize	aComponentSubsampling [4]
	Subsampling factors of component, as described in frame header. More...
Npp16s *	apComponentBuffer [4]
	Buffer containing DCT coefficients. More...

Detailed Description

JPEG frame descriptor.

Can hold from 1 to 4 components.

Field Documentation

NppiSize NppiJpegFrameDescr::aComponentSubsampling[4]

Subsampling factors of component, as described in frame header.

Npp16s* NppiJpegFrameDescr::apComponentBuffer[4]

Buffer containing DCT coefficients.

Use nppiJpegDecodeGetDCTBufferSize to determine size of this buffer. After decoding, coefficients will be stored in zig-zag order, block by block. So the c-th coeffient of block (x, y) will be stored at buffer[64 * (y * interleavedComponentWidthInBlocks + x) + c].

Npp8u NppiJpegFrameDescr::nComponents

Number of components in frame.

NppiSize NppiJpegFrameDescr::oSizeInBlocks

Size of component with 1x1 subsampling (usually luma) in DCT blocks.

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The documentation for this struct was generated from the following file:

• C:/src/sw/gpgpu/NPP/npp/include/nppi_compression_functions.h