Function fourcc

rustcv-camera/src/pixel_format.rs:77–79

Helper macro to build a FourCC u32 from 4 ASCII bytes. 辅助宏：从 4 个 ASCII 字节构造 FourCC u32 值。

(a: u8, b: u8, c: u8, d: u8)

/// Helper macro to build a FourCC u32 from 4 ASCII bytes.
/// 辅助宏：从 4 个 ASCII 字节构造 FourCC u32 值。
const fn fourcc(a: u8, b: u8, c: u8, d: u8) -> u32 {
    (a as u32) | ((b as u32) << 8) | ((c as u32) << 16) | ((d as u32) << 24)
}

/// Well-known FourCC constants matching V4L2 / kernel definitions.
/// 与 V4L2 / 内核定义一致的常用 FourCC 常量。