avhu (A/V Huffman)
cdfl (CD FLAC)
cdlz (CD LZMA)
cdzl (CD Deflate)
flac (FLAC)
huff (Huffman)
lzma (LZMA)
zlib (Deflate)

// general codecs
const chd_codec_type CHD_CODEC_ZLIB             = CHD_MAKE_TAG('z','l','i','b');
const chd_codec_type CHD_CODEC_LZMA             = CHD_MAKE_TAG('l','z','m','a');
const chd_codec_type CHD_CODEC_HUFFMAN          = CHD_MAKE_TAG('h','u','f','f');
const chd_codec_type CHD_CODEC_FLAC             = CHD_MAKE_TAG('f','l','a','c');

// general codecs with CD frontend
const chd_codec_type CHD_CODEC_CD_ZLIB          = CHD_MAKE_TAG('c','d','z','l');
const chd_codec_type CHD_CODEC_CD_LZMA          = CHD_MAKE_TAG('c','d','l','z');
const chd_codec_type CHD_CODEC_CD_FLAC          = CHD_MAKE_TAG('c','d','f','l');

// A/V codecs
const chd_codec_type CHD_CODEC_AVHUFF           = CHD_MAKE_TAG('a','v','h','u');