return val;}static inline int decode_dc(GetBitContext *gb, int component){    int code, diff;    if (component == 0) {        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);    } else {        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);    }    if (code < 0){        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");        return 0xffff;    }    if (code == 0) {        diff = 0;    } else {        diff = get_xbits(gb, code);    }    return diff;}static inline int mpeg1_decode_block_intra(MpegEncContext *s,                                DCTELEM *block,                                int n){    int level, dc, diff, i, j, run;    int component;    RLTable *rl = &rl_mpeg1;    uint8_t * const scantable= s->intra_scantable.permutated;    const uint16_t *quant_matrix= s->intra_matrix;    const int qscale= s->qscale;        /* DC coef */        component = (n <= 3 ? 0 : n - 4 + 1);    diff = decode_dc(&s->gb, component);        if (diff >= 0xffff)            return -1;        dc = s->last_dc[component];        dc += diff;        s->last_dc[component] = dc;    block[0] = dc<<3;        dprintf("dc=%d diff=%d\n", dc, diff);    i = 0;    {        OPEN_READER(re, &s->gb);            /* now quantify & encode AC coefs */        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*qscale*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 */                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);                UPDATE_CACHE(re, &s->gb);                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);                if (level == -128) {                    level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);                } else if (level == 0) {                    level = SHOW_UBITS(re, &s->gb, 8)      ; LAST_SKIP_BITS(re, &s->gb, 8);                }                i += run;                j = scantable[i];                if(level<0){                    level= -level;                    level= (level*qscale*quant_matrix[j])>>4;                    level= (level-1)|1;                    level= -level;    } else {                    level= (level*qscale*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 -1;            }            block[j] = level;        }        CLOSE_READER(re, &s->gb);    }    s->block_last_index[n] = i;   return 0;}static inline int mpeg1_decode_block_inter(MpegEncContext *s,                                DCTELEM *block,                                int n){    int level, i, j, run;    RLTable *rl = &rl_mpeg1;    uint8_t * const scantable= s->intra_scantable.permutated;    const uint16_t *quant_matrix= s->inter_matrix;    const int qscale= s->qscale;    {        OPEN_READER(re, &s->gb);        i = -1;        /* special case for the first coef. no need to add a second vlc table */        UPDATE_CACHE(re, &s->gb);        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {            level= (3*qscale*quant_matrix[0])>>5;            level= (level-1)|1;            if(GET_CACHE(re, &s->gb)&0x40000000)                level= -level;            block[0] = level;            i++;            SKIP_BITS(re, &s->gb, 2);            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)                goto end;    }    /* now quantify & encode AC coefs */    for(;;) {            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);                        if(level != 0) {                i += run;                j = scantable[i];                level= ((level*2+1)*qscale*quant_matrix[j])>>5;                level= (level-1)|1;                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);                SKIP_BITS(re, &s->gb, 1);            } else {            /* escape */                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);                UPDATE_CACHE(re, &s->gb);                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);            if (level == -128) {                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);            } else if (level == 0) {                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);            }                i += run;                j = scantable[i];                if(level<0){                    level= -level;                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;                    level= (level-1)|1;                    level= -level;        } else {                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;                    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 -1;            }        block[j] = level;            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)                break;            UPDATE_CACHE(re, &s->gb);    }end:        LAST_SKIP_BITS(re, &s->gb, 2);        CLOSE_READER(re, &s->gb);    }    s->block_last_index[n] = i;    return 0;}static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n){    int level, i, j, run;    RLTable *rl = &rl_mpeg1;    uint8_t * const scantable= s->intra_scantable.permutated;    const int qscale= s->qscale;    {        OPEN_READER(re, &s->gb);        i = -1;        /* special case for the first coef. no need to add a second vlc table */        UPDATE_CACHE(re, &s->gb);        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {            level= (3*qscale)>>1;            level= (level-1)|1;            if(GET_CACHE(re, &s->gb)&0x40000000)                level= -level;            block[0] = level;            i++;            SKIP_BITS(re, &s->gb, 2);            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)                goto end;        }        /* now quantify & encode AC coefs */        for(;;) {            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);                        if(level != 0) {                i += run;                j = scantable[i];                level= ((level*2+1)*qscale)>>1;                level= (level-1)|1;                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);                SKIP_BITS(re, &s->gb, 1);            } else {                /* escape */                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);                UPDATE_CACHE(re, &s->gb);                level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);                if (level == -128) {                    level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);                } else if (level == 0) {                    level = SHOW_UBITS(re, &s->gb, 8)      ; SKIP_BITS(re, &s->gb, 8);                }                i += run;                j = scantable[i];                if(level<0){                    level= -level;                    level= ((level*2+1)*qscale)>>1;                    level= (level-1)|1;                    level= -level;                }else{                    level= ((level*2+1)*qscale)>>1;                    level= (level-1)|1;                }            }            block[j] = level;            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)                break;            UPDATE_CACHE(re, &s->gb);        }end:        LAST_SKIP_BITS(re, &s->gb, 2);        CLOSE_READER(re, &s->gb);    }    s->block_last_index[n] = i;    return 0;}static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,                                         DCTELEM *block,                                         int n){    int level, i, j, run;    RLTable *rl = &rl_mpeg1;    uint8_t * const scantable= s->intra_scantable.permutated;    const uint16_t *quant_matrix;    const int qscale= s->qscale;    int mismatch;    mismatch = 1;    {        OPEN_READER(re, &s->gb);        i = -1;        if (n < 4)             quant_matrix = s->inter_matrix;        else            quant_matrix = s->chroma_inter_matrix;                    /* special case for the first coef. no need to add a second vlc table */        UPDATE_CACHE(re, &s->gb);        if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {            level= (3*qscale*quant_matrix[0])>>5;            if(GET_CACHE(re, &s->gb)&0x40000000)                level= -level;            block[0] = level;            mismatch ^= level;            i++;            SKIP_BITS(re, &s->gb, 2);            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)                goto end;    }    /* now quantify & encode AC coefs */    for(;;) {            GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);                        if(level != 0) {                i += run;                j = scantable[i];                level= ((level*2+1)*qscale*quant_matrix[j])>>5;                level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);                SKIP_BITS(re, &s->gb, 1);            } else {            /* escape */                run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);                UPDATE_CACHE(re, &s->gb);                level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);                i += run;                j = scantable[i];                if(level<0){                    level= ((-level*2+1)*qscale*quant_matrix[j])>>5;                    level= -level;        } else {                    level= ((level*2+1)*qscale*quant_matrix[j])>>5;                }        }            if (i > 63){                av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);            return -1;        }                    mismatch ^= level;        block[j] = level;            if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)                break;            UPDATE_CACHE(re, &s->gb);        }end:        LAST_SKIP_BITS(re, &s->gb, 2);        CLOSE_READER(re, &s->gb);    }    block[63] ^= (mismatch & 1);        s->block_last_index[n] = i;    return 0;}static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,                                DCTELEM *block,                                int n){    int level, i, j, run;    RLTable *rl = &rl_mpeg1;    uint8_t * const scantable= s->intra_scantable.permutated;    const int qscale= s->qscale;    OPEN_READER(re, &s->gb);    i = -1;    /* special case for the first coef. no need to add a second vlc table */    UPDATE_CACHE(re, &s->gb);    if (((int32_t)GET_CACHE(re, &s->gb)) < 0) {        level= (3*qscale)>>1;        if(GET_CACHE(re, &s->gb)&0x40000000)            level= -level;        block[0] = level;        i++;        SKIP_BITS(re, &s->gb, 2);        if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)            goto end;    }    /* now quantify & encode AC coefs */    for(;;) {        GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);                if(level != 0) {            i += run;            j = scantable[i];            level= ((level*2+1)*qscale)>>1;            level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);            SKIP_BITS(re, &s->gb, 1);        } else {            /* escape */            run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);            UPDATE_CACH