done = 1;
void mpeg1_init_vlc(MpegEncContext *s){    static int done = 0;    if (!done) {        init_vlc(&dc_lum_vlc, 9, 12,                  vlc_dc_lum_bits, 1, 1,                 vlc_dc_lum_code, 2, 2);        init_vlc(&dc_chroma_vlc, 9, 12,                  vlc_dc_chroma_bits, 1, 1,                 vlc_dc_chroma_code, 2, 2);        init_vlc(&mv_vlc, 9, 17,                  &mbMotionVectorTable[0][1], 2, 1,                 &mbMotionVectorTable[0][0], 2, 1);        init_vlc(&mbincr_vlc, 9, 35,                  &mbAddrIncrTable[0][1], 2, 1,                 &mbAddrIncrTable[0][0], 2, 1);        init_vlc(&mb_pat_vlc, 9, 63,                  &mbPatTable[0][1], 2, 1,                 &mbPatTable[0][0], 2, 1);                init_vlc(&mb_ptype_vlc, 6, 32,                  &table_mb_ptype[0][1], 2, 1,                 &table_mb_ptype[0][0], 2, 1);        init_vlc(&mb_btype_vlc, 6, 32,                  &table_mb_btype[0][1], 2, 1,                 &table_mb_btype[0][0], 2, 1);        init_rl(&rl_mpeg1);        init_rl(&rl_mpeg2);        /* cannot use generic init because we must add the EOB code */        init_vlc(&rl_mpeg1.vlc, 9, rl_mpeg1.n + 2,                  &rl_mpeg1.table_vlc[0][1], 4, 2,                 &rl_mpeg1.table_vlc[0][0], 4, 2);        init_vlc(&rl_mpeg2.vlc, 9, rl_mpeg2.n + 2,                  &rl_mpeg2.table_vlc[0][1], 4, 2,                 &rl_mpeg2.table_vlc[0][0], 4, 2);    }}