Function ffav_sys::avcodec_chroma_pos_to_enum

pub unsafe extern "C" fn avcodec_chroma_pos_to_enum(
    xpos: c_int, 
    ypos: c_int
) -> AVChromaLocation

Converts swscale x/y chroma position to AVChromaLocation.

The positions represent the chroma (0,0) position in a coordinates system with luma (0,0) representing the origin and luma(1,1) representing 256,256

@param xpos horizontal chroma sample position @param ypos vertical chroma sample position