int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl)

{

    int mb_xy;

    int partition_count;

    unsigned int mb_type, cbp;

    int dct8x8_allowed= h->pps.transform_8x8_mode;

    int decode_chroma = h->sps.chroma_format_idc == 1 || h->sps.chroma_format_idc == 2;

    const int pixel_shift = h->pixel_shift;



    mb_xy = sl->mb_xy = sl->mb_x + sl->mb_y*h->mb_stride;



    ff_tlog(h->avctx, "pic:%d mb:%d/%d\n", h->frame_num, sl->mb_x, sl->mb_y);

    cbp = 0; 



    if (sl->slice_type_nos != AV_PICTURE_TYPE_I) {

        if (sl->mb_skip_run == -1)

            sl->mb_skip_run = get_ue_golomb(&sl->gb);



        if (sl->mb_skip_run--) {

            if (FRAME_MBAFF(h) && (sl->mb_y & 1) == 0) {

                if (sl->mb_skip_run == 0)

                    sl->mb_mbaff = sl->mb_field_decoding_flag = get_bits1(&sl->gb);

            }

            decode_mb_skip(h, sl);

            return 0;

        }

    }

    if (FRAME_MBAFF(h)) {

        if ((sl->mb_y & 1) == 0)

            sl->mb_mbaff = sl->mb_field_decoding_flag = get_bits1(&sl->gb);

    }



    sl->prev_mb_skipped = 0;



    mb_type= get_ue_golomb(&sl->gb);

    if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {

        if(mb_type < 23){

            partition_count = ff_h264_b_mb_type_info[mb_type].partition_count;

            mb_type         = ff_h264_b_mb_type_info[mb_type].type;

        }else{

            mb_type -= 23;

            goto decode_intra_mb;

        }

    } else if (sl->slice_type_nos == AV_PICTURE_TYPE_P) {

        if(mb_type < 5){

            partition_count = ff_h264_p_mb_type_info[mb_type].partition_count;

            mb_type         = ff_h264_p_mb_type_info[mb_type].type;

        }else{

            mb_type -= 5;

            goto decode_intra_mb;

        }

    }else{

       assert(sl->slice_type_nos == AV_PICTURE_TYPE_I);

        if (sl->slice_type == AV_PICTURE_TYPE_SI && mb_type)

            mb_type--;

decode_intra_mb:

        if(mb_type > 25){

            av_log(h->avctx, AV_LOG_ERROR, "mb_type %d in %c slice too large at %d %d\n", mb_type, av_get_picture_type_char(sl->slice_type), sl->mb_x, sl->mb_y);

            return -1;

        }

        partition_count=0;

        cbp                      = ff_h264_i_mb_type_info[mb_type].cbp;

        sl->intra16x16_pred_mode = ff_h264_i_mb_type_info[mb_type].pred_mode;

        mb_type                  = ff_h264_i_mb_type_info[mb_type].type;

    }



    if (MB_FIELD(sl))

        mb_type |= MB_TYPE_INTERLACED;



    h->slice_table[mb_xy] = sl->slice_num;



    if(IS_INTRA_PCM(mb_type)){

        const int mb_size = ff_h264_mb_sizes[h->sps.chroma_format_idc] *

                            h->sps.bit_depth_luma;



        

        sl->intra_pcm_ptr = align_get_bits(&sl->gb);

        if (get_bits_left(&sl->gb) < mb_size) {

            av_log(h->avctx, AV_LOG_ERROR, "Not enough data for an intra PCM block.\n");

            return AVERROR_INVALIDDATA;

        }

        skip_bits_long(&sl->gb, mb_size);



        

        h->cur_pic.qscale_table[mb_xy] = 0;

        

        memset(h->non_zero_count[mb_xy], 16, 48);



        h->cur_pic.mb_type[mb_xy] = mb_type;

        return 0;

    }



    fill_decode_neighbors(h, sl, mb_type);

    fill_decode_caches(h, sl, mb_type);



    

    if(IS_INTRA(mb_type)){

        int pred_mode;



        if(IS_INTRA4x4(mb_type)){

            int i;

            int di = 1;

            if(dct8x8_allowed && get_bits1(&sl->gb)){

                mb_type |= MB_TYPE_8x8DCT;

                di = 4;

            }





            for(i=0; i<16; i+=di){

                int mode = pred_intra_mode(h, sl, i);



                if(!get_bits1(&sl->gb)){

                    const int rem_mode= get_bits(&sl->gb, 3);

                    mode = rem_mode + (rem_mode >= mode);

                }



                if(di==4)

                    fill_rectangle(&sl->intra4x4_pred_mode_cache[ scan8[i] ], 2, 2, 8, mode, 1);

                else

                    sl->intra4x4_pred_mode_cache[scan8[i]] = mode;

            }

            write_back_intra_pred_mode(h, sl);

            if (ff_h264_check_intra4x4_pred_mode(sl->intra4x4_pred_mode_cache, h->avctx,

                                                 sl->top_samples_available, sl->left_samples_available) < 0)

                return -1;

        }else{

            sl->intra16x16_pred_mode = ff_h264_check_intra_pred_mode(h->avctx, sl->top_samples_available,

                                                                     sl->left_samples_available, sl->intra16x16_pred_mode, 0);

            if (sl->intra16x16_pred_mode < 0)

                return -1;

        }

        if(decode_chroma){

            pred_mode= ff_h264_check_intra_pred_mode(h->avctx, sl->top_samples_available,

                                                     sl->left_samples_available, get_ue_golomb_31(&sl->gb), 1);

            if(pred_mode < 0)

                return -1;

            sl->chroma_pred_mode = pred_mode;

        } else {

            sl->chroma_pred_mode = DC_128_PRED8x8;

        }

    }else if(partition_count==4){

        int i, j, sub_partition_count[4], list, ref[2][4];



        if (sl->slice_type_nos == AV_PICTURE_TYPE_B) {

            for(i=0; i<4; i++){

                sl->sub_mb_type[i]= get_ue_golomb_31(&sl->gb);

                if(sl->sub_mb_type[i] >=13){

                    av_log(h->avctx, AV_LOG_ERROR, "B sub_mb_type %u out of range at %d %d\n", sl->sub_mb_type[i], sl->mb_x, sl->mb_y);

                    return -1;

                }

                sub_partition_count[i] = ff_h264_b_sub_mb_type_info[sl->sub_mb_type[i]].partition_count;

                sl->sub_mb_type[i]     = ff_h264_b_sub_mb_type_info[sl->sub_mb_type[i]].type;

            }

            if( IS_DIRECT(sl->sub_mb_type[0]|sl->sub_mb_type[1]|sl->sub_mb_type[2]|sl->sub_mb_type[3])) {

                ff_h264_pred_direct_motion(h, sl, &mb_type);

                sl->ref_cache[0][scan8[4]] =

                sl->ref_cache[1][scan8[4]] =

                sl->ref_cache[0][scan8[12]] =

                sl->ref_cache[1][scan8[12]] = PART_NOT_AVAILABLE;

            }

        }else{

            assert(sl->slice_type_nos == AV_PICTURE_TYPE_P); 

            for(i=0; i<4; i++){

                sl->sub_mb_type[i]= get_ue_golomb_31(&sl->gb);

                if(sl->sub_mb_type[i] >=4){

                    av_log(h->avctx, AV_LOG_ERROR, "P sub_mb_type %u out of range at %d %d\n", sl->sub_mb_type[i], sl->mb_x, sl->mb_y);

                    return -1;

                }

                sub_partition_count[i] = ff_h264_p_sub_mb_type_info[sl->sub_mb_type[i]].partition_count;

                sl->sub_mb_type[i]     = ff_h264_p_sub_mb_type_info[sl->sub_mb_type[i]].type;

            }

        }



        for (list = 0; list < sl->list_count; list++) {

            int ref_count = IS_REF0(mb_type) ? 1 : sl->ref_count[list] << MB_MBAFF(sl);

            for(i=0; i<4; i++){

                if(IS_DIRECT(sl->sub_mb_type[i])) continue;

                if(IS_DIR(sl->sub_mb_type[i], 0, list)){

                    unsigned int tmp;

                    if(ref_count == 1){

                        tmp= 0;

                    }else if(ref_count == 2){

                        tmp= get_bits1(&sl->gb)^1;

                    }else{

                        tmp= get_ue_golomb_31(&sl->gb);

                        if(tmp>=ref_count){

                            av_log(h->avctx, AV_LOG_ERROR, "ref %u overflow\n", tmp);

                            return -1;

                        }

                    }

                    ref[list][i]= tmp;

                }else{

                 

                    ref[list][i] = -1;

                }

            }

        }



        if(dct8x8_allowed)

            dct8x8_allowed = get_dct8x8_allowed(h, sl);



        for (list = 0; list < sl->list_count; list++) {

            for(i=0; i<4; i++){

                if(IS_DIRECT(sl->sub_mb_type[i])) {

                    sl->ref_cache[list][ scan8[4*i] ] = sl->ref_cache[list][ scan8[4*i]+1 ];

                    continue;

                }

                sl->ref_cache[list][ scan8[4*i]   ]=sl->ref_cache[list][ scan8[4*i]+1 ]=

                sl->ref_cache[list][ scan8[4*i]+8 ]=sl->ref_cache[list][ scan8[4*i]+9 ]= ref[list][i];



                if(IS_DIR(sl->sub_mb_type[i], 0, list)){

                    const int sub_mb_type= sl->sub_mb_type[i];

                    const int block_width= (sub_mb_type & (MB_TYPE_16x16|MB_TYPE_16x8)) ? 2 : 1;

                    for(j=0; j<sub_partition_count[i]; j++){

                        int mx, my;

                        const int index= 4*i + block_width*j;

                        int16_t (* mv_cache)[2]= &sl->mv_cache[list][ scan8[index] ];

                        pred_motion(h, sl, index, block_width, list, sl->ref_cache[list][ scan8[index] ], &mx, &my);

                        mx += get_se_golomb(&sl->gb);

                        my += get_se_golomb(&sl->gb);

                        ff_tlog(h->avctx, "final mv:%d %d\n", mx, my);



                        if(IS_SUB_8X8(sub_mb_type)){

                            mv_cache[ 1 ][0]=

                            mv_cache[ 8 ][0]= mv_cache[ 9 ][0]= mx;

                            mv_cache[ 1 ][1]=

                            mv_cache[ 8 ][1]= mv_cache[ 9 ][1]= my;

                        }else if(IS_SUB_8X4(sub_mb_type)){

                            mv_cache[ 1 ][0]= mx;

                            mv_cache[ 1 ][1]= my;

                        }else if(IS_SUB_4X8(sub_mb_type)){

                            mv_cache[ 8 ][0]= mx;

                            mv_cache[ 8 ][1]= my;

                        }

                        mv_cache[ 0 ][0]= mx;

                        mv_cache[ 0 ][1]= my;

                    }

                }else{

                    uint32_t *p= (uint32_t *)&sl->mv_cache[list][ scan8[4*i] ][0];

                    p[0] = p[1]=

                    p[8] = p[9]= 0;

                }

            }

        }

    }else if(IS_DIRECT(mb_type)){

        ff_h264_pred_direct_motion(h, sl, &mb_type);

        dct8x8_allowed &= h->sps.direct_8x8_inference_flag;

    }else{

        int list, mx, my, i;

          we should set ref_idx_l? to 0 if we use that later ...

        if(IS_16X16(mb_type)){

            for (list = 0; list < sl->list_count; list++) {

                    unsigned int val;

                    if(IS_DIR(mb_type, 0, list)){

                        int rc = sl->ref_count[list] << MB_MBAFF(sl);

                        if (rc == 1) {

                            val= 0;

                        } else if (rc == 2) {

                            val= get_bits1(&sl->gb)^1;

                        }else{

                            val= get_ue_golomb_31(&sl->gb);

                            if (val >= rc) {

                                av_log(h->avctx, AV_LOG_ERROR, "ref %u overflow\n", val);

                                return -1;

                            }

                        }

                    fill_rectangle(&sl->ref_cache[list][ scan8[0] ], 4, 4, 8, val, 1);

                    }

            }

            for (list = 0; list < sl->list_count; list++) {

                if(IS_DIR(mb_type, 0, list)){

                    pred_motion(h, sl, 0, 4, list, sl->ref_cache[list][ scan8[0] ], &mx, &my);

                    mx += get_se_golomb(&sl->gb);

                    my += get_se_golomb(&sl->gb);

                    ff_tlog(h->avctx, "final mv:%d %d\n", mx, my);



                    fill_rectangle(sl->mv_cache[list][ scan8[0] ], 4, 4, 8, pack16to32(mx,my), 4);

                }

            }

        }

        else if(IS_16X8(mb_type)){

            for (list = 0; list < sl->list_count; list++) {

                    for(i=0; i<2; i++){

                        unsigned int val;

                        if(IS_DIR(mb_type, i, list)){

                            int rc = sl->ref_count[list] << MB_MBAFF(sl);

                            if (rc == 1) {

                                val= 0;

                            } else if (rc == 2) {

                                val= get_bits1(&sl->gb)^1;

                            }else{

                                val= get_ue_golomb_31(&sl->gb);

                                if (val >= rc) {

                                    av_log(h->avctx, AV_LOG_ERROR, "ref %u overflow\n", val);

                                    return -1;

                                }

                            }

                        }else

                            val= LIST_NOT_USED&0xFF;

                        fill_rectangle(&sl->ref_cache[list][ scan8[0] + 16*i ], 4, 2, 8, val, 1);

                    }

            }

            for (list = 0; list < sl->list_count; list++) {

                for(i=0; i<2; i++){

                    unsigned int val;

                    if(IS_DIR(mb_type, i, list)){

                        pred_16x8_motion(h, sl, 8*i, list, sl->ref_cache[list][scan8[0] + 16*i], &mx, &my);

                        mx += get_se_golomb(&sl->gb);

                        my += get_se_golomb(&sl->gb);

                        ff_tlog(h->avctx, "final mv:%d %d\n", mx, my);



                        val= pack16to32(mx,my);

                    }else

                        val=0;

                    fill_rectangle(sl->mv_cache[list][ scan8[0] + 16*i ], 4, 2, 8, val, 4);

                }

            }

        }else{

            assert(IS_8X16(mb_type));

            for (list = 0; list < sl->list_count; list++) {

                    for(i=0; i<2; i++){

                        unsigned int val;

                        if(IS_DIR(mb_type, i, list)){  optimize

                            int rc = sl->ref_count[list] << MB_MBAFF(sl);

                            if (rc == 1) {

                                val= 0;

                            } else if (rc == 2) {

                                val= get_bits1(&sl->gb)^1;

                            }else{

                                val= get_ue_golomb_31(&sl->gb);

                                if (val >= rc) {

                                    av_log(h->avctx, AV_LOG_ERROR, "ref %u overflow\n", val);

                                    return -1;

                                }

                            }

                        }else

                            val= LIST_NOT_USED&0xFF;

                        fill_rectangle(&sl->ref_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 1);

                    }

            }

            for (list = 0; list < sl->list_count; list++) {

                for(i=0; i<2; i++){

                    unsigned int val;

                    if(IS_DIR(mb_type, i, list)){

                        pred_8x16_motion(h, sl, i*4, list, sl->ref_cache[list][ scan8[0] + 2*i ], &mx, &my);

                        mx += get_se_golomb(&sl->gb);

                        my += get_se_golomb(&sl->gb);

                        ff_tlog(h->avctx, "final mv:%d %d\n", mx, my);



                        val= pack16to32(mx,my);

                    }else

                        val=0;

                    fill_rectangle(sl->mv_cache[list][ scan8[0] + 2*i ], 2, 4, 8, val, 4);

                }

            }

        }

    }



    if(IS_INTER(mb_type))

        write_back_motion(h, sl, mb_type);



    if(!IS_INTRA16x16(mb_type)){

        cbp= get_ue_golomb(&sl->gb);



        if(decode_chroma){

            if(cbp > 47){

                av_log(h->avctx, AV_LOG_ERROR, "cbp too large (%u) at %d %d\n", cbp, sl->mb_x, sl->mb_y);

                return -1;

            }

            if (IS_INTRA4x4(mb_type))

                cbp = ff_h264_golomb_to_intra4x4_cbp[cbp];

            else

                cbp = ff_h264_golomb_to_inter_cbp[cbp];

        }else{

            if(cbp > 15){

                av_log(h->avctx, AV_LOG_ERROR, "cbp too large (%u) at %d %d\n", cbp, sl->mb_x, sl->mb_y);

                return -1;

            }

            if(IS_INTRA4x4(mb_type)) cbp= golomb_to_intra4x4_cbp_gray[cbp];

            else                     cbp= golomb_to_inter_cbp_gray[cbp];

        }

    }



    if(dct8x8_allowed && (cbp&15) && !IS_INTRA(mb_type)){

        mb_type |= MB_TYPE_8x8DCT*get_bits1(&sl->gb);

    }

    sl->cbp=

    h->cbp_table[mb_xy]= cbp;

    h->cur_pic.mb_type[mb_xy] = mb_type;



    if(cbp || IS_INTRA16x16(mb_type)){

        int i4x4, i8x8, chroma_idx;

        int dquant;

        int ret;

        GetBitContext *gb = &sl->gb;

        const uint8_t *scan, *scan8x8;

        const int max_qp = 51 + 6*(h->sps.bit_depth_luma-8);



        if(IS_INTERLACED(mb_type)){

            scan8x8 = sl->qscale ? h->field_scan8x8_cavlc : h->field_scan8x8_cavlc_q0;

            scan    = sl->qscale ? h->field_scan : h->field_scan_q0;

        }else{

            scan8x8 = sl->qscale ? h->zigzag_scan8x8_cavlc : h->zigzag_scan8x8_cavlc_q0;

            scan    = sl->qscale ? h->zigzag_scan : h->zigzag_scan_q0;

        }



        dquant= get_se_golomb(&sl->gb);



        sl->qscale += dquant;



        if (((unsigned)sl->qscale) > max_qp){

            if (sl->qscale < 0) sl->qscale += max_qp + 1;

            else                sl->qscale -= max_qp+1;

            if (((unsigned)sl->qscale) > max_qp){

                av_log(h->avctx, AV_LOG_ERROR, "dquant out of range (%d) at %d %d\n", dquant, sl->mb_x, sl->mb_y);

                return -1;

            }

        }



        sl->chroma_qp[0] = get_chroma_qp(h, 0, sl->qscale);

        sl->chroma_qp[1] = get_chroma_qp(h, 1, sl->qscale);



        if ((ret = decode_luma_residual(h, sl, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 0)) < 0 ) {

            return -1;

        }

        h->cbp_table[mb_xy] |= ret << 12;

        if (CHROMA444(h)) {

            if (decode_luma_residual(h, sl, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 1) < 0 ) {

                return -1;

            }

            if (decode_luma_residual(h, sl, gb, scan, scan8x8, pixel_shift, mb_type, cbp, 2) < 0 ) {

                return -1;

            }

        } else if (CHROMA422(h)) {

            if(cbp&0x30){

                for(chroma_idx=0; chroma_idx<2; chroma_idx++)

                    if (decode_residual(h, sl, gb, sl->mb + ((256 + 16*16*chroma_idx) << pixel_shift),

                                        CHROMA_DC_BLOCK_INDEX + chroma_idx, ff_h264_chroma422_dc_scan,

                                        NULL, 8) < 0) {

                        return -1;

                    }

            }



            if(cbp&0x20){

                for(chroma_idx=0; chroma_idx<2; chroma_idx++){

                    const uint32_t *qmul = h->dequant4_coeff[chroma_idx+1+(IS_INTRA( mb_type ) ? 0:3)][sl->chroma_qp[chroma_idx]];

                    int16_t *mb = sl->mb + (16*(16 + 16*chroma_idx) << pixel_shift);

                    for (i8x8 = 0; i8x8 < 2; i8x8++) {

                        for (i4x4 = 0; i4x4 < 4; i4x4++) {

                            const int index = 16 + 16*chroma_idx + 8*i8x8 + i4x4;

                            if (decode_residual(h, sl, gb, mb, index, scan + 1, qmul, 15) < 0)

                                return -1;

                            mb += 16 << pixel_shift;

                        }

                    }

                }

            }else{

                fill_rectangle(&sl->non_zero_count_cache[scan8[16]], 4, 4, 8, 0, 1);

                fill_rectangle(&sl->non_zero_count_cache[scan8[32]], 4, 4, 8, 0, 1);

            }

        } else  {

            if(cbp&0x30){

                for(chroma_idx=0; chroma_idx<2; chroma_idx++)

                    if (decode_residual(h, sl, gb, sl->mb + ((256 + 16 * 16 * chroma_idx) << pixel_shift),

                                        CHROMA_DC_BLOCK_INDEX + chroma_idx, ff_h264_chroma_dc_scan, NULL, 4) < 0) {

                        return -1;

                    }

            }



            if(cbp&0x20){

                for(chroma_idx=0; chroma_idx<2; chroma_idx++){

                    const uint32_t *qmul = h->dequant4_coeff[chroma_idx+1+(IS_INTRA( mb_type ) ? 0:3)][sl->chroma_qp[chroma_idx]];

                    for(i4x4=0; i4x4<4; i4x4++){

                        const int index= 16 + 16*chroma_idx + i4x4;

                        if( decode_residual(h, sl, gb, sl->mb + (16*index << pixel_shift), index, scan + 1, qmul, 15) < 0){

                            return -1;

                        }

                    }

                }

            }else{

                fill_rectangle(&sl->non_zero_count_cache[scan8[16]], 4, 4, 8, 0, 1);

                fill_rectangle(&sl->non_zero_count_cache[scan8[32]], 4, 4, 8, 0, 1);

            }

        }

    }else{

        fill_rectangle(&sl->non_zero_count_cache[scan8[ 0]], 4, 4, 8, 0, 1);

        fill_rectangle(&sl->non_zero_count_cache[scan8[16]], 4, 4, 8, 0, 1);

        fill_rectangle(&sl->non_zero_count_cache[scan8[32]], 4, 4, 8, 0, 1);

    }

    h->cur_pic.qscale_table[mb_xy] = sl->qscale;

    write_back_non_zero_count(h, sl);



    return 0;

}
