fn read_tkhd()

in mp4parse/src/lib.rs [4530:4576]
42 lines of code
2 McCabe index (conditional complexity)

fn read_tkhd<T: Read>(src: &mut BMFFBox<T>) -> Result<TrackHeaderBox> {
    let (version, flags) = read_fullbox_extra(src)?;
    let disabled = flags & 0x1u32 == 0 || flags & 0x2u32 == 0;
    match version {
        // 64 bit creation and modification times.
        1 => {
            skip(src, 16)?;
        }
        // 32 bit creation and modification times.
        0 => {
            skip(src, 8)?;
        }
        _ => return Status::TkhdBadVersion.into(),
    }
    let track_id = be_u32(src)?;
    skip(src, 4)?;
    let duration = match version {
        1 => be_u64(src)?,
        0 => u64::from(be_u32(src)?),
        _ => unreachable!("Should have returned Status::TkhdBadVersion"),
    };
    // Skip uninteresting fields.
    skip(src, 16)?;

    let matrix = Matrix {
        a: be_i32(src)?,
        b: be_i32(src)?,
        u: be_i32(src)?,
        c: be_i32(src)?,
        d: be_i32(src)?,
        v: be_i32(src)?,
        x: be_i32(src)?,
        y: be_i32(src)?,
        w: be_i32(src)?,
    };

    let width = be_u32(src)?;
    let height = be_u32(src)?;
    Ok(TrackHeaderBox {
        track_id,
        disabled,
        duration,
        width,
        height,
        matrix,
    })
}