let luma_dc_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
let mut coderead = CodeReader::new(RV10_CHROMA_DC_CODES, RV10_CHROMA_DC_BITS);
let chroma_dc_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
let luma_dc_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();
let mut coderead = CodeReader::new(RV10_CHROMA_DC_CODES, RV10_CHROMA_DC_BITS);
let chroma_dc_cb = Codebook::new(&mut coderead, CodebookMode::MSB).unwrap();