结构体 AVPixFmtDescriptor 

#[repr(C)]
pub struct AVPixFmtDescriptor {
    pub name: *const c_char,
    pub nb_components: u8,
    pub log2_chroma_w: u8,
    pub log2_chroma_h: u8,
    pub flags: u64,
    pub comp: [AVComponentDescriptor; 4],
    pub alias: *const c_char,
}

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.

Fields

name: *const c_char

nb_components: u8

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

log2_chroma_w: u8

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.

log2_chroma_h: u8

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.

flags: u64

Combination of AV_PIX_FMT_FLAG_… flags.

comp: [AVComponentDescriptor; 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.

alias: *const c_char

Alternative comma-separated names.

trait 实现

impl Clone for AVPixFmtDescriptor

fn clone(&self) -> AVPixFmtDescriptor

Returns a duplicate of the value. 阅读更多

fn clone_from(&mut self, source: &Self)

从 source 执行拷贝赋值。 阅读更多

impl Debug for AVPixFmtDescriptor

fn fmt(&self, f: &mut Formatter<'_>) -> Result

使用给定的格式化器格式化该值。 阅读更多

impl PartialEq for AVPixFmtDescriptor

fn eq(&self, other: &AVPixFmtDescriptor) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

测试 !=。默认实现几乎总是足够的，没有充分理由不应被重写。

impl Copy for AVPixFmtDescriptor

impl Eq for AVPixFmtDescriptor

impl StructuralPartialEq for AVPixFmtDescriptor