UV_SCANLINE_ALIGN
uv_scanlines = ALIGN((f->fmt.pix_mp.height + 1) >> 1, UV_SCANLINE_ALIGN);
uv_plane = ALIGN(uv_stride * ALIGN((f->fmt.pix_mp.height + 1) >> 1, UV_SCANLINE_ALIGN),
uv_scanlines = ALIGN((f->fmt.pix_mp.height + 1) >> 1, UV_SCANLINE_ALIGN);