Struct Located 

struct Located {
    start: usize,
    end: usize,
    vui_present: bool,
    vui_flag: usize,
    declared: Option<ColorSignal>,
    pic_order_cnt_type: u32,
    max_num_ref_frames: u32,
    frame_num: (u32, usize, usize),
    separate_planes: bool,
}

Where the video signal type sits in a VUI, and what it says today.

Fields

start: usize

The bit the block starts at: the video_signal_type_present_flag itself.

end: usize

The bit after the block, where the rest of the VUI resumes.

vui_present: bool

Present when the VUI exists at all; a VUI has to be created otherwise.

vui_flag: usize

The bit the vui_parameters_present_flag sits at, for a stream that carries no VUI.

declared: Option<ColorSignal>

pic_order_cnt_type: u32

max_num_ref_frames: u32

frame_num: (u32, usize, usize)

log2_max_frame_num_minus4 as coded.

separate_planes: bool

separate_colour_plane_flag, which puts a field ahead of frame_num in every slice.