FFmpeg
2.5.4
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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>
Data Fields | |
const char * | name |
uint8_t | nb_components |
The number of components each pixel has, (1-4) More... | |
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... | |
uint8_t | flags |
AVComponentDescriptor | comp [4] |
Parameters that describe how pixels are packed. More... | |
const char * | alias |
Alternative comma-separated names. More... | |
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.
uint8_t AVPixFmtDescriptor::nb_components |
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 = -((-luma_width) >> log2_chroma_w) The note above is needed to ensure rounding up. This value only refers to the chroma components.chroma_width = -((-luma_width )>>log2_chroma_w)
uint8_t AVPixFmtDescriptor::log2_chroma_h |
AVComponentDescriptor AVPixFmtDescriptor::comp[4] |
Parameters that describe how pixels are packed.
If the format has 2 or 4 components, then alpha is last. 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.
const char* AVPixFmtDescriptor::alias |