Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes of an image. More...

#include <pixdesc.h>

Public Attributes
const char *	name

uint8_t	nb_components
	The number of components each pixel has, (1-4)

uint8_t	log2_chroma_w
	Amount to shift the luma width right to find the chroma width. More...

uint8_t	log2_chroma_h
	Amount to shift the luma height right to find the chroma height. More...

uint64_t	flags
	Combination of AV_PIX_FMT_FLAG_... More...

AVComponentDescriptor	comp [4]
	Parameters that describe how pixels are packed. More...

const char *	alias
	Alternative comma-separated names.

Detailed Description

Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes of an image.

It also stores the subsampling factors and number of components.

Note: This is separate of the colorspace (RGB, YCbCr, YPbPr, JPEG-style YUV and all the YUV variants) AVPixFmtDescriptor just stores how values are stored not what these values represent.

Member Data Documentation

§ comp

AVComponentDescriptor AVPixFmtDescriptor::comp[4]

Parameters that describe how pixels are packed.

If the format has 1 or 2 components, then luma is 0. If the format has 3 or 4 components: if the RGB flag is set then 0 is red, 1 is green and 2 is blue; otherwise 0 is luma, 1 is chroma-U and 2 is chroma-V.

If present, the Alpha channel is always the last component.

§ flags

uint64_t AVPixFmtDescriptor::flags

Combination of AV_PIX_FMT_FLAG_...

flags.

§ log2_chroma_h

uint8_t AVPixFmtDescriptor::log2_chroma_h

Amount to shift the luma height right to find the chroma height.

For YV12 this is 1 for example. chroma_height= AV_CEIL_RSHIFT(luma_height, log2_chroma_h) The note above is needed to ensure rounding up. This value only refers to the chroma components.

§ log2_chroma_w

uint8_t AVPixFmtDescriptor::log2_chroma_w

Amount to shift the luma width right to find the chroma width.

For YV12 this is 1 for example. chroma_width = AV_CEIL_RSHIFT(luma_width, log2_chroma_w) The note above is needed to ensure rounding up. This value only refers to the chroma components.

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

libavutil/pixdesc.h