枚举 AVColorRange 

#[repr(i32)]
pub enum AVColorRange {
    AVCOL_RANGE_UNSPECIFIED = 0,
    AVCOL_RANGE_MPEG = 1,
    AVCOL_RANGE_JPEG = 2,
    AVCOL_RANGE_NB = 3,
}

Visual content value range.

These values are based on definitions that can be found in multiple specifications, such as ITU-T BT.709 (3.4 - Quantization of RGB, luminance and colour-difference signals), ITU-T BT.2020 (Table 5 - Digital Representation) as well as ITU-T BT.2100 (Table 9 - Digital 10- and 12-bit integer representation). At the time of writing, the BT.2100 one is recommended, as it also defines the full range representation.

Common definitions:

• For RGB and luma planes such as Y in YCbCr and I in ICtCp, ‘E’ is the original value in range of 0.0 to 1.0.
• For chroma planes such as Cb,Cr and Ct,Cp, ‘E’ is the original value in range of -0.5 to 0.5.
• ‘n’ is the output bit depth.
• For additional definitions such as rounding and clipping to valid n bit unsigned integer range, please refer to BT.2100 (Table 9).

Variants

AVCOL_RANGE_UNSPECIFIED = 0

AVCOL_RANGE_MPEG = 1

Narrow or limited range content.

• For luma planes:

  (219 * E + 16) * 2^(n-8)

  F.ex. the range of 16-235 for 8 bits

• For chroma planes:

  (224 * E + 128) * 2^(n-8)

  F.ex. the range of 16-240 for 8 bits

AVCOL_RANGE_JPEG = 2

Full range content.

• For RGB and luma planes:

  (2^n - 1) * E

  F.ex. the range of 0-255 for 8 bits

• For chroma planes:

  (2^n - 1) * E + 2^(n - 1)

  F.ex. the range of 1-255 for 8 bits

AVCOL_RANGE_NB = 3

< Not part of ABI

trait 实现

impl Clone for AVColorRange

fn clone(&self) -> AVColorRange

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 AVColorRange

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 AVColorRange

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 AVColorRange

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

impl Eq for AVColorRange

impl StructuralPartialEq for AVColorRange