proc av_spherical_alloc(size: ptr csize_t): ptr AVSphericalMapping {.importc,
    cdecl, ...raises: [], tags: [], forbids: [].}

proc av_spherical_from_name(name: cstring): cint {.importc, cdecl, ...raises: [],
    tags: [], forbids: [].}

proc av_spherical_projection_name(projection: AVSphericalProjection): cstring {.
    importc, cdecl, ...raises: [], tags: [], forbids: [].}

proc av_spherical_tile_bounds(map: ptr AVSphericalMapping;
                              width, height: csize_t;
                              left, top, right, bottom: ptr csize_t) {.importc,
    cdecl, ...raises: [], tags: [], forbids: [].}