LZW_PREFIX_EMPTY  175 libavcodec/lzwenc.c         s->tab[h].hash_prefix = LZW_PREFIX_EMPTY;
LZW_PREFIX_EMPTY  209 libavcodec/lzwenc.c     s->last_code = LZW_PREFIX_EMPTY;
LZW_PREFIX_EMPTY  228 libavcodec/lzwenc.c     if (s->last_code == LZW_PREFIX_EMPTY)