函数 av_stereo3d_primary_eye_name 

pub unsafe extern "C" fn av_stereo3d_primary_eye_name(
    eye: c_uint,
) -> *const c_char

Provide a human-readable name of a given stereo3d primary eye.

@param type The input stereo3d primary eye value.

@return The name of the stereo3d primary eye value, or “unknown”.