ref: 7bdda1ff148fbe5823875ee205a4e3e7868ada2f dir: /yuv.h/
typedef struct YUV YUV; struct YUV { u8int *y, *u, *v; int ys, us, vs; }; void xrgb2yuv420(u8int *bgrx, int w, int h, YUV *yuv);