ref: 47e3976507a60bc7e6caeb4ffddf5805a5cef1c3 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);