YUV Color Conversion (yuv)

YUV to RGB color space conversion module, supporting both BT.601 and BT.709 standards, using integer arithmetic to avoid floating-point dependencies.

Color Spaces

Standard	Typical Use
BT.601	Standard definition (SD) video, e.g., PAL/NTSC television
BT.709	High definition (HD) video, e.g., 720p/1080p

The two standards use different conversion coefficients; mixing them causes color偏差.

Data Range

Uses limited range:

Component	Range	Description
Y	16~235	Luma, 16 is black, 235 is white
U / V	16~240	Chroma, 128 is neutral
R / G / B	0~255	Full range

API

BT.601

void bt601_yuv2rgb(uint8_t y, uint8_t u, uint8_t v, uint8_t * r, uint8_t * g, uint8_t * b);

BT.601 YUV to RGB conversion, result clamped to [0, 255].

void bt601_rgb2yuv(uint8_t r, uint8_t g, uint8_t b, uint8_t * y, uint8_t * u, uint8_t * v);

BT.601 RGB to YUV conversion.

BT.709

void bt709_yuv2rgb(uint8_t y, uint8_t u, uint8_t v, uint8_t * r, uint8_t * g, uint8_t * b);

BT.709 YUV to RGB conversion, result clamped to [0, 255].

void bt709_rgb2yuv(uint8_t r, uint8_t g, uint8_t b, uint8_t * y, uint8_t * u, uint8_t * v);

BT.709 RGB to YUV conversion.

Usage Examples

Decoding Video Frame Pixels

uint8_t y = yplane[i];
uint8_t u = uplane[i / 2];
uint8_t v = vplane[i / 2];
uint8_t r, g, b;
bt709_yuv2rgb(y, u, v, &r, &g, &b);

Encoding RGB to YUV

uint8_t y, u, v;
bt601_rgb2yuv(r, g, b, &y, &u, &v);