static inline void decode_block_intra(MadContext *s, int16_t * block)

{

    int level, i, j, run;

    RLTable *rl = &ff_rl_mpeg1;

    const uint8_t *scantable = s->scantable.permutated;

    int16_t *quant_matrix = s->quant_matrix;



    block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];



    /* The RL decoder is derived from mpeg1_decode_block_intra;

       Escaped level and run values a decoded differently */

    i = 0;

    {

        OPEN_READER(re, &s->gb);

        /* now quantify & encode AC coefficients */

        for (;;) {

            UPDATE_CACHE(re, &s->gb);

            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);



            if (level == 127) {

                break;

            } else if (level != 0) {

                i += run;

                j = scantable[i];

                level = (level*quant_matrix[j]) >> 4;

                level = (level-1)|1;

                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);

                LAST_SKIP_BITS(re, &s->gb, 1);

            } else {

                /* escape */

                UPDATE_CACHE(re, &s->gb);

                level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);



                UPDATE_CACHE(re, &s->gb);

                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);



                i += run;

                j = scantable[i];

                if (level < 0) {

                    level = -level;

                    level = (level*quant_matrix[j]) >> 4;

                    level = (level-1)|1;

                    level = -level;

                } else {

                    level = (level*quant_matrix[j]) >> 4;

                    level = (level-1)|1;

                }

            }

            if (i > 63) {

                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);

                return;

            }



            block[j] = level;

        }

        CLOSE_READER(re, &s->gb);

    }

}
