枚举 AVChromaLocation 

#[repr(i32)]
pub enum AVChromaLocation {
    AVCHROMA_LOC_UNSPECIFIED = 0,
    AVCHROMA_LOC_LEFT = 1,
    AVCHROMA_LOC_CENTER = 2,
    AVCHROMA_LOC_TOPLEFT = 3,
    AVCHROMA_LOC_TOP = 4,
    AVCHROMA_LOC_BOTTOMLEFT = 5,
    AVCHROMA_LOC_BOTTOM = 6,
    AVCHROMA_LOC_NB = 7,
}

Location of chroma samples.

Illustration showing the location of the first (top left) chroma sample of the image, the left shows only luma, the right shows the location of the chroma sample, the 2 could be imagined to overlay each other but are drawn separately due to limitations of ASCII

            1st 2nd       1st 2nd horizontal luma sample positions
             v   v         v   v
             ______        ______

1st luma line > |X X … |3 4 X … X are luma samples, | |1 2 1-6 are possible chroma positions 2nd luma line > |X X … |5 6 X … 0 is undefined/unknown position

Variants

AVCHROMA_LOC_UNSPECIFIED = 0

AVCHROMA_LOC_LEFT = 1

< MPEG-2/4 4:2:0, H.264 default for 4:2:0

AVCHROMA_LOC_CENTER = 2

< MPEG-1 4:2:0, JPEG 4:2:0, H.263 4:2:0

AVCHROMA_LOC_TOPLEFT = 3

< ITU-R 601, SMPTE 274M 296M S314M(DV 4:1:1), mpeg2 4:2:2

AVCHROMA_LOC_TOP = 4

AVCHROMA_LOC_BOTTOMLEFT = 5

AVCHROMA_LOC_BOTTOM = 6

AVCHROMA_LOC_NB = 7

< Not part of ABI

trait 实现

impl Clone for AVChromaLocation

fn clone(&self) -> AVChromaLocation

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 AVChromaLocation

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 Hash for AVChromaLocation

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. 阅读更多

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. 阅读更多

impl PartialEq for AVChromaLocation

fn eq(&self, other: &AVChromaLocation) -> 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 AVChromaLocation

impl Eq for AVChromaLocation

impl StructuralPartialEq for AVChromaLocation