+ /// Bit offset from NAL Header Unit to the begining of slice_data().
+ ///
+ /// This bit offset is relative to and includes the NAL unit byte
+ /// and represents the number of bits parsed in the slice_header()
+ /// after the removal of any emulation prevention bytes in
+ /// there. However, the slice data buffer passed to the hardware is
+ /// the original bitstream, thus including any emulation prevention
+ /// bytes.