/*
  * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 /**

  * @file libavcodec/h264.c

  * H.264 / AVC / MPEG4 part10 codec.
  * @author Michael Niedermayer <michaelni@gmx.at>
  */
 

 #include "internal.h"

 #include "dsputil.h"
 #include "avcodec.h"
 #include "mpegvideo.h"

 #include "h264.h"

 #include "h264data.h"

 #include "h264_parser.h"

 #include "golomb.h"

 #include "mathops.h"

 #include "rectangle.h"

 #include "vdpau_internal.h"

 #include "cabac.h"

 #if ARCH_X86

 #include "x86/h264_i386.h"

 #endif

 //#undef NDEBUG

 #include <assert.h>
 

 /**
  * Value of Picture.reference when Picture is not a reference picture, but
  * is held for delayed output.
  */
 #define DELAYED_PIC_REF 4
 

 static VLC coeff_token_vlc[4];

 static VLC_TYPE coeff_token_vlc_tables[520+332+280+256][2];
 static const int coeff_token_vlc_tables_size[4]={520,332,280,256};
 

 static VLC chroma_dc_coeff_token_vlc;

 static VLC_TYPE chroma_dc_coeff_token_vlc_table[256][2];
 static const int chroma_dc_coeff_token_vlc_table_size = 256;

 
 static VLC total_zeros_vlc[15];

 static VLC_TYPE total_zeros_vlc_tables[15][512][2];
 static const int total_zeros_vlc_tables_size = 512;
 

 static VLC chroma_dc_total_zeros_vlc[3];

 static VLC_TYPE chroma_dc_total_zeros_vlc_tables[3][8][2];
 static const int chroma_dc_total_zeros_vlc_tables_size = 8;

 
 static VLC run_vlc[6];

 static VLC_TYPE run_vlc_tables[6][8][2];
 static const int run_vlc_tables_size = 8;
 

 static VLC run7_vlc;

 static VLC_TYPE run7_vlc_table[96][2];
 static const int run7_vlc_table_size = 96;

 static void svq3_luma_dc_dequant_idct_c(DCTELEM *block, int qp);
 static void svq3_add_idct_c(uint8_t *dst, DCTELEM *block, int stride, int qp, int dc);

 static void filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr, unsigned int linesize, unsigned int uvlinesize);

 static void filter_mb_fast( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr, unsigned int linesize, unsigned int uvlinesize);

 static Picture * remove_long(H264Context *h, int i, int ref_mask);

 static av_always_inline uint32_t pack16to32(int a, int b){

 #ifdef WORDS_BIGENDIAN
    return (b&0xFFFF) + (a<<16);
 #else
    return (a&0xFFFF) + (b<<16);
 #endif
 }
 

 static const uint8_t rem6[52]={

 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3,
 };
 

 static const uint8_t div6[52]={

 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8,
 };
 

 static const uint8_t left_block_options[4][8]={

     {0,1,2,3,7,10,8,11},
     {2,2,3,3,8,11,8,11},
     {0,0,1,1,7,10,7,10},
     {0,2,0,2,7,10,7,10}
 };

 #define LEVEL_TAB_BITS 8
 static int8_t cavlc_level_tab[7][1<<LEVEL_TAB_BITS][2];
 

 static void fill_caches(H264Context *h, int mb_type, int for_deblock){

     MpegEncContext * const s = &h->s;

     const int mb_xy= h->mb_xy;

     int topleft_xy, top_xy, topright_xy, left_xy[2];
     int topleft_type, top_type, topright_type, left_type[2];

     const uint8_t * left_block;

     int topleft_partition= -1;

     int i;
 

     top_xy     = mb_xy  - (s->mb_stride << FIELD_PICTURE);
 

     //FIXME deblocking could skip the intra and nnz parts.

     if(for_deblock && (h->slice_num == 1 || h->slice_table[mb_xy] == h->slice_table[top_xy]) && !FRAME_MBAFF)

         return;
 

     /* Wow, what a mess, why didn't they simplify the interlacing & intra
      * stuff, I can't imagine that these complex rules are worth it. */

     topleft_xy = top_xy - 1;
     topright_xy= top_xy + 1;
     left_xy[1] = left_xy[0] = mb_xy-1;

     left_block = left_block_options[0];

     if(FRAME_MBAFF){

         const int pair_xy          = s->mb_x     + (s->mb_y & ~1)*s->mb_stride;
         const int top_pair_xy      = pair_xy     - s->mb_stride;
         const int topleft_pair_xy  = top_pair_xy - 1;
         const int topright_pair_xy = top_pair_xy + 1;

         const int topleft_mb_field_flag  = IS_INTERLACED(s->current_picture.mb_type[topleft_pair_xy]);
         const int top_mb_field_flag      = IS_INTERLACED(s->current_picture.mb_type[top_pair_xy]);
         const int topright_mb_field_flag = IS_INTERLACED(s->current_picture.mb_type[topright_pair_xy]);
         const int left_mb_field_flag     = IS_INTERLACED(s->current_picture.mb_type[pair_xy-1]);
         const int curr_mb_field_flag     = IS_INTERLACED(mb_type);

         const int bottom = (s->mb_y & 1);

         tprintf(s->avctx, "fill_caches: curr_mb_field_flag:%d, left_mb_field_flag:%d, topleft_mb_field_flag:%d, top_mb_field_flag:%d, topright_mb_field_flag:%d\n", curr_mb_field_flag, left_mb_field_flag, topleft_mb_field_flag, top_mb_field_flag, topright_mb_field_flag);

         if (curr_mb_field_flag && (bottom || top_mb_field_flag)){

             top_xy -= s->mb_stride;
         }

         if (curr_mb_field_flag && (bottom || topleft_mb_field_flag)){

             topleft_xy -= s->mb_stride;

         } else if(bottom && !curr_mb_field_flag && left_mb_field_flag) {

             topleft_xy += s->mb_stride;

             // take top left mv from the middle of the mb, as opposed to all other modes which use the bottom right partition

             topleft_partition = 0;

         }

         if (curr_mb_field_flag && (bottom || topright_mb_field_flag)){

             topright_xy -= s->mb_stride;
         }

         if (left_mb_field_flag != curr_mb_field_flag) {

             left_xy[1] = left_xy[0] = pair_xy - 1;

             if (curr_mb_field_flag) {
                 left_xy[1] += s->mb_stride;
                 left_block = left_block_options[3];
             } else {

                 left_block= left_block_options[2 - bottom];

             }
         }

     }
 

     h->top_mb_xy = top_xy;
     h->left_mb_xy[0] = left_xy[0];
     h->left_mb_xy[1] = left_xy[1];

     if(for_deblock){

         topleft_type = 0;
         topright_type = 0;

         top_type     = h->slice_table[top_xy     ] < 0xFFFF ? s->current_picture.mb_type[top_xy]     : 0;
         left_type[0] = h->slice_table[left_xy[0] ] < 0xFFFF ? s->current_picture.mb_type[left_xy[0]] : 0;
         left_type[1] = h->slice_table[left_xy[1] ] < 0xFFFF ? s->current_picture.mb_type[left_xy[1]] : 0;

         if(MB_MBAFF && !IS_INTRA(mb_type)){

             int list;

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

                 //These values where changed for ease of performing MC, we need to change them back
                 //FIXME maybe we can make MC and loop filter use the same values or prevent
                 //the MC code from changing ref_cache and rather use a temporary array.

                 if(USES_LIST(mb_type,list)){

                     int8_t *ref = &s->current_picture.ref_index[list][h->mb2b8_xy[mb_xy]];

                     *(uint32_t*)&h->ref_cache[list][scan8[ 0]] =

                     *(uint32_t*)&h->ref_cache[list][scan8[ 2]] = (pack16to32(ref[0],ref[1])&0x00FF00FF)*0x0101;

                     ref += h->b8_stride;
                     *(uint32_t*)&h->ref_cache[list][scan8[ 8]] =

                     *(uint32_t*)&h->ref_cache[list][scan8[10]] = (pack16to32(ref[0],ref[1])&0x00FF00FF)*0x0101;

                 }
             }
         }

     }else{
         topleft_type = h->slice_table[topleft_xy ] == h->slice_num ? s->current_picture.mb_type[topleft_xy] : 0;
         top_type     = h->slice_table[top_xy     ] == h->slice_num ? s->current_picture.mb_type[top_xy]     : 0;
         topright_type= h->slice_table[topright_xy] == h->slice_num ? s->current_picture.mb_type[topright_xy]: 0;
         left_type[0] = h->slice_table[left_xy[0] ] == h->slice_num ? s->current_picture.mb_type[left_xy[0]] : 0;
         left_type[1] = h->slice_table[left_xy[1] ] == h->slice_num ? s->current_picture.mb_type[left_xy[1]] : 0;

 
     if(IS_INTRA(mb_type)){

         int type_mask= h->pps.constrained_intra_pred ? IS_INTRA(-1) : -1;

         h->topleft_samples_available=
         h->top_samples_available=

         h->left_samples_available= 0xFFFF;
         h->topright_samples_available= 0xEEEA;
 

         if(!(top_type & type_mask)){

             h->topleft_samples_available= 0xB3FF;
             h->top_samples_available= 0x33FF;
             h->topright_samples_available= 0x26EA;
         }

         if(IS_INTERLACED(mb_type) != IS_INTERLACED(left_type[0])){
             if(IS_INTERLACED(mb_type)){

                 if(!(left_type[0] & type_mask)){

                     h->topleft_samples_available&= 0xDFFF;
                     h->left_samples_available&= 0x5FFF;
                 }

                 if(!(left_type[1] & type_mask)){

                     h->topleft_samples_available&= 0xFF5F;
                     h->left_samples_available&= 0xFF5F;
                 }
             }else{
                 int left_typei = h->slice_table[left_xy[0] + s->mb_stride ] == h->slice_num
                                 ? s->current_picture.mb_type[left_xy[0] + s->mb_stride] : 0;
                 assert(left_xy[0] == left_xy[1]);

                 if(!((left_typei & type_mask) && (left_type[0] & type_mask))){

                     h->topleft_samples_available&= 0xDF5F;
                     h->left_samples_available&= 0x5F5F;
                 }
             }
         }else{

             if(!(left_type[0] & type_mask)){

                 h->topleft_samples_available&= 0xDF5F;
                 h->left_samples_available&= 0x5F5F;
             }
         }

         if(!(topleft_type & type_mask))

             h->topleft_samples_available&= 0x7FFF;

         if(!(topright_type & type_mask))

             h->topright_samples_available&= 0xFBFF;

         if(IS_INTRA4x4(mb_type)){
             if(IS_INTRA4x4(top_type)){
                 h->intra4x4_pred_mode_cache[4+8*0]= h->intra4x4_pred_mode[top_xy][4];
                 h->intra4x4_pred_mode_cache[5+8*0]= h->intra4x4_pred_mode[top_xy][5];
                 h->intra4x4_pred_mode_cache[6+8*0]= h->intra4x4_pred_mode[top_xy][6];
                 h->intra4x4_pred_mode_cache[7+8*0]= h->intra4x4_pred_mode[top_xy][3];
             }else{
                 int pred;

                 if(!(top_type & type_mask))

                     pred= -1;

                 else{
                     pred= 2;

                 }
                 h->intra4x4_pred_mode_cache[4+8*0]=
                 h->intra4x4_pred_mode_cache[5+8*0]=
                 h->intra4x4_pred_mode_cache[6+8*0]=
                 h->intra4x4_pred_mode_cache[7+8*0]= pred;
             }
             for(i=0; i<2; i++){
                 if(IS_INTRA4x4(left_type[i])){
                     h->intra4x4_pred_mode_cache[3+8*1 + 2*8*i]= h->intra4x4_pred_mode[left_xy[i]][left_block[0+2*i]];
                     h->intra4x4_pred_mode_cache[3+8*2 + 2*8*i]= h->intra4x4_pred_mode[left_xy[i]][left_block[1+2*i]];
                 }else{
                     int pred;

                     if(!(left_type[i] & type_mask))

                         pred= -1;

                     else{
                         pred= 2;

                     }
                     h->intra4x4_pred_mode_cache[3+8*1 + 2*8*i]=
                     h->intra4x4_pred_mode_cache[3+8*2 + 2*8*i]= pred;
                 }
             }
         }
     }

     }

 /*

 0 . T T. T T T T
 1 L . .L . . . .
 2 L . .L . . . .
 3 . T TL . . . .
 4 L . .L . . . .
 5 L . .. . . . .

 */

 //FIXME constraint_intra_pred & partitioning & nnz (let us hope this is just a typo in the spec)

     if(top_type){

         h->non_zero_count_cache[4+8*0]= h->non_zero_count[top_xy][4];
         h->non_zero_count_cache[5+8*0]= h->non_zero_count[top_xy][5];
         h->non_zero_count_cache[6+8*0]= h->non_zero_count[top_xy][6];

         h->non_zero_count_cache[7+8*0]= h->non_zero_count[top_xy][3];

         h->non_zero_count_cache[1+8*0]= h->non_zero_count[top_xy][9];

         h->non_zero_count_cache[2+8*0]= h->non_zero_count[top_xy][8];

         h->non_zero_count_cache[1+8*3]= h->non_zero_count[top_xy][12];

         h->non_zero_count_cache[2+8*3]= h->non_zero_count[top_xy][11];

     }else{

         h->non_zero_count_cache[4+8*0]=

         h->non_zero_count_cache[5+8*0]=
         h->non_zero_count_cache[6+8*0]=
         h->non_zero_count_cache[7+8*0]=

         h->non_zero_count_cache[1+8*0]=
         h->non_zero_count_cache[2+8*0]=

         h->non_zero_count_cache[1+8*3]=

         h->non_zero_count_cache[2+8*3]= h->pps.cabac && !IS_INTRA(mb_type) ? 0 : 64;

     }

     for (i=0; i<2; i++) {
         if(left_type[i]){
             h->non_zero_count_cache[3+8*1 + 2*8*i]= h->non_zero_count[left_xy[i]][left_block[0+2*i]];
             h->non_zero_count_cache[3+8*2 + 2*8*i]= h->non_zero_count[left_xy[i]][left_block[1+2*i]];
             h->non_zero_count_cache[0+8*1 +   8*i]= h->non_zero_count[left_xy[i]][left_block[4+2*i]];
             h->non_zero_count_cache[0+8*4 +   8*i]= h->non_zero_count[left_xy[i]][left_block[5+2*i]];
         }else{

             h->non_zero_count_cache[3+8*1 + 2*8*i]=
             h->non_zero_count_cache[3+8*2 + 2*8*i]=
             h->non_zero_count_cache[0+8*1 +   8*i]=

             h->non_zero_count_cache[0+8*4 +   8*i]= h->pps.cabac && !IS_INTRA(mb_type) ? 0 : 64;

         }
     }
 
     if( h->pps.cabac ) {
         // top_cbp
         if(top_type) {
             h->top_cbp = h->cbp_table[top_xy];
         } else if(IS_INTRA(mb_type)) {
             h->top_cbp = 0x1C0;
         } else {
             h->top_cbp = 0;
         }
         // left_cbp
         if (left_type[0]) {
             h->left_cbp = h->cbp_table[left_xy[0]] & 0x1f0;
         } else if(IS_INTRA(mb_type)) {
             h->left_cbp = 0x1C0;
         } else {
             h->left_cbp = 0;
         }
         if (left_type[0]) {
             h->left_cbp |= ((h->cbp_table[left_xy[0]]>>((left_block[0]&(~1))+1))&0x1) << 1;
         }
         if (left_type[1]) {
             h->left_cbp |= ((h->cbp_table[left_xy[1]]>>((left_block[2]&(~1))+1))&0x1) << 3;

         }

     }

 #if 1

     if(IS_INTER(mb_type) || IS_DIRECT(mb_type)){

         int list;

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

             if(!USES_LIST(mb_type, list) && !IS_DIRECT(mb_type) && !h->deblocking_filter){

                 /*if(!h->mv_cache_clean[list]){
                     memset(h->mv_cache [list],  0, 8*5*2*sizeof(int16_t)); //FIXME clean only input? clean at all?
                     memset(h->ref_cache[list], PART_NOT_AVAILABLE, 8*5*sizeof(int8_t));
                     h->mv_cache_clean[list]= 1;
                 }*/

                 continue;

             }
             h->mv_cache_clean[list]= 0;

             if(USES_LIST(top_type, list)){

                 const int b_xy= h->mb2b_xy[top_xy] + 3*h->b_stride;
                 const int b8_xy= h->mb2b8_xy[top_xy] + h->b8_stride;
                 *(uint32_t*)h->mv_cache[list][scan8[0] + 0 - 1*8]= *(uint32_t*)s->current_picture.motion_val[list][b_xy + 0];
                 *(uint32_t*)h->mv_cache[list][scan8[0] + 1 - 1*8]= *(uint32_t*)s->current_picture.motion_val[list][b_xy + 1];
                 *(uint32_t*)h->mv_cache[list][scan8[0] + 2 - 1*8]= *(uint32_t*)s->current_picture.motion_val[list][b_xy + 2];
                 *(uint32_t*)h->mv_cache[list][scan8[0] + 3 - 1*8]= *(uint32_t*)s->current_picture.motion_val[list][b_xy + 3];
                 h->ref_cache[list][scan8[0] + 0 - 1*8]=
                 h->ref_cache[list][scan8[0] + 1 - 1*8]= s->current_picture.ref_index[list][b8_xy + 0];
                 h->ref_cache[list][scan8[0] + 2 - 1*8]=
                 h->ref_cache[list][scan8[0] + 3 - 1*8]= s->current_picture.ref_index[list][b8_xy + 1];
             }else{

                 *(uint32_t*)h->mv_cache [list][scan8[0] + 0 - 1*8]=
                 *(uint32_t*)h->mv_cache [list][scan8[0] + 1 - 1*8]=
                 *(uint32_t*)h->mv_cache [list][scan8[0] + 2 - 1*8]=

                 *(uint32_t*)h->mv_cache [list][scan8[0] + 3 - 1*8]= 0;
                 *(uint32_t*)&h->ref_cache[list][scan8[0] + 0 - 1*8]= ((top_type ? LIST_NOT_USED : PART_NOT_AVAILABLE)&0xFF)*0x01010101;
             }
 

             for(i=0; i<2; i++){
                 int cache_idx = scan8[0] - 1 + i*2*8;
                 if(USES_LIST(left_type[i], list)){
                     const int b_xy= h->mb2b_xy[left_xy[i]] + 3;
                     const int b8_xy= h->mb2b8_xy[left_xy[i]] + 1;
                     *(uint32_t*)h->mv_cache[list][cache_idx  ]= *(uint32_t*)s->current_picture.motion_val[list][b_xy + h->b_stride*left_block[0+i*2]];
                     *(uint32_t*)h->mv_cache[list][cache_idx+8]= *(uint32_t*)s->current_picture.motion_val[list][b_xy + h->b_stride*left_block[1+i*2]];
                     h->ref_cache[list][cache_idx  ]= s->current_picture.ref_index[list][b8_xy + h->b8_stride*(left_block[0+i*2]>>1)];
                     h->ref_cache[list][cache_idx+8]= s->current_picture.ref_index[list][b8_xy + h->b8_stride*(left_block[1+i*2]>>1)];
                 }else{
                     *(uint32_t*)h->mv_cache [list][cache_idx  ]=
                     *(uint32_t*)h->mv_cache [list][cache_idx+8]= 0;
                     h->ref_cache[list][cache_idx  ]=
                     h->ref_cache[list][cache_idx+8]= left_type[i] ? LIST_NOT_USED : PART_NOT_AVAILABLE;
                 }

             }
 

             if(for_deblock || ((IS_DIRECT(mb_type) && !h->direct_spatial_mv_pred) && !FRAME_MBAFF))

                 continue;
 

             if(USES_LIST(topleft_type, list)){

                 const int b_xy = h->mb2b_xy[topleft_xy] + 3 + h->b_stride + (topleft_partition & 2*h->b_stride);
                 const int b8_xy= h->mb2b8_xy[topleft_xy] + 1 + (topleft_partition & h->b8_stride);

                 *(uint32_t*)h->mv_cache[list][scan8[0] - 1 - 1*8]= *(uint32_t*)s->current_picture.motion_val[list][b_xy];
                 h->ref_cache[list][scan8[0] - 1 - 1*8]= s->current_picture.ref_index[list][b8_xy];
             }else{
                 *(uint32_t*)h->mv_cache[list][scan8[0] - 1 - 1*8]= 0;
                 h->ref_cache[list][scan8[0] - 1 - 1*8]= topleft_type ? LIST_NOT_USED : PART_NOT_AVAILABLE;
             }

             if(USES_LIST(topright_type, list)){

                 const int b_xy= h->mb2b_xy[topright_xy] + 3*h->b_stride;
                 const int b8_xy= h->mb2b8_xy[topright_xy] + h->b8_stride;
                 *(uint32_t*)h->mv_cache[list][scan8[0] + 4 - 1*8]= *(uint32_t*)s->current_picture.motion_val[list][b_xy];
                 h->ref_cache[list][scan8[0] + 4 - 1*8]= s->current_picture.ref_index[list][b8_xy];
             }else{
                 *(uint32_t*)h->mv_cache [list][scan8[0] + 4 - 1*8]= 0;
                 h->ref_cache[list][scan8[0] + 4 - 1*8]= topright_type ? LIST_NOT_USED : PART_NOT_AVAILABLE;
             }
 

             if((IS_SKIP(mb_type) || IS_DIRECT(mb_type)) && !FRAME_MBAFF)

                 continue;

 
             h->ref_cache[list][scan8[5 ]+1] =
             h->ref_cache[list][scan8[7 ]+1] =

             h->ref_cache[list][scan8[13]+1] =  //FIXME remove past 3 (init somewhere else)

             h->ref_cache[list][scan8[4 ]] =

             h->ref_cache[list][scan8[12]] = PART_NOT_AVAILABLE;
             *(uint32_t*)h->mv_cache [list][scan8[5 ]+1]=
             *(uint32_t*)h->mv_cache [list][scan8[7 ]+1]=

             *(uint32_t*)h->mv_cache [list][scan8[13]+1]= //FIXME remove past 3 (init somewhere else)

             *(uint32_t*)h->mv_cache [list][scan8[4 ]]=
             *(uint32_t*)h->mv_cache [list][scan8[12]]= 0;

 
             if( h->pps.cabac ) {
                 /* XXX beurk, Load mvd */

                 if(USES_LIST(top_type, list)){

                     const int b_xy= h->mb2b_xy[top_xy] + 3*h->b_stride;
                     *(uint32_t*)h->mvd_cache[list][scan8[0] + 0 - 1*8]= *(uint32_t*)h->mvd_table[list][b_xy + 0];
                     *(uint32_t*)h->mvd_cache[list][scan8[0] + 1 - 1*8]= *(uint32_t*)h->mvd_table[list][b_xy + 1];
                     *(uint32_t*)h->mvd_cache[list][scan8[0] + 2 - 1*8]= *(uint32_t*)h->mvd_table[list][b_xy + 2];
                     *(uint32_t*)h->mvd_cache[list][scan8[0] + 3 - 1*8]= *(uint32_t*)h->mvd_table[list][b_xy + 3];
                 }else{

                     *(uint32_t*)h->mvd_cache [list][scan8[0] + 0 - 1*8]=
                     *(uint32_t*)h->mvd_cache [list][scan8[0] + 1 - 1*8]=
                     *(uint32_t*)h->mvd_cache [list][scan8[0] + 2 - 1*8]=

                     *(uint32_t*)h->mvd_cache [list][scan8[0] + 3 - 1*8]= 0;
                 }

                 if(USES_LIST(left_type[0], list)){

                     const int b_xy= h->mb2b_xy[left_xy[0]] + 3;
                     *(uint32_t*)h->mvd_cache[list][scan8[0] - 1 + 0*8]= *(uint32_t*)h->mvd_table[list][b_xy + h->b_stride*left_block[0]];
                     *(uint32_t*)h->mvd_cache[list][scan8[0] - 1 + 1*8]= *(uint32_t*)h->mvd_table[list][b_xy + h->b_stride*left_block[1]];
                 }else{
                     *(uint32_t*)h->mvd_cache [list][scan8[0] - 1 + 0*8]=
                     *(uint32_t*)h->mvd_cache [list][scan8[0] - 1 + 1*8]= 0;
                 }

                 if(USES_LIST(left_type[1], list)){

                     const int b_xy= h->mb2b_xy[left_xy[1]] + 3;
                     *(uint32_t*)h->mvd_cache[list][scan8[0] - 1 + 2*8]= *(uint32_t*)h->mvd_table[list][b_xy + h->b_stride*left_block[2]];
                     *(uint32_t*)h->mvd_cache[list][scan8[0] - 1 + 3*8]= *(uint32_t*)h->mvd_table[list][b_xy + h->b_stride*left_block[3]];
                 }else{
                     *(uint32_t*)h->mvd_cache [list][scan8[0] - 1 + 2*8]=
                     *(uint32_t*)h->mvd_cache [list][scan8[0] - 1 + 3*8]= 0;
                 }
                 *(uint32_t*)h->mvd_cache [list][scan8[5 ]+1]=
                 *(uint32_t*)h->mvd_cache [list][scan8[7 ]+1]=

                 *(uint32_t*)h->mvd_cache [list][scan8[13]+1]= //FIXME remove past 3 (init somewhere else)

                 *(uint32_t*)h->mvd_cache [list][scan8[4 ]]=
                 *(uint32_t*)h->mvd_cache [list][scan8[12]]= 0;

                 if(h->slice_type_nos == FF_B_TYPE){

                     fill_rectangle(&h->direct_cache[scan8[0]], 4, 4, 8, 0, 1);
 
                     if(IS_DIRECT(top_type)){
                         *(uint32_t*)&h->direct_cache[scan8[0] - 1*8]= 0x01010101;
                     }else if(IS_8X8(top_type)){
                         int b8_xy = h->mb2b8_xy[top_xy] + h->b8_stride;
                         h->direct_cache[scan8[0] + 0 - 1*8]= h->direct_table[b8_xy];
                         h->direct_cache[scan8[0] + 2 - 1*8]= h->direct_table[b8_xy + 1];
                     }else{
                         *(uint32_t*)&h->direct_cache[scan8[0] - 1*8]= 0;
                     }

                     if(IS_DIRECT(left_type[0]))
                         h->direct_cache[scan8[0] - 1 + 0*8]= 1;
                     else if(IS_8X8(left_type[0]))
                         h->direct_cache[scan8[0] - 1 + 0*8]= h->direct_table[h->mb2b8_xy[left_xy[0]] + 1 + h->b8_stride*(left_block[0]>>1)];
                     else
                         h->direct_cache[scan8[0] - 1 + 0*8]= 0;
 
                     if(IS_DIRECT(left_type[1]))

                         h->direct_cache[scan8[0] - 1 + 2*8]= 1;

                     else if(IS_8X8(left_type[1]))
                         h->direct_cache[scan8[0] - 1 + 2*8]= h->direct_table[h->mb2b8_xy[left_xy[1]] + 1 + h->b8_stride*(left_block[2]>>1)];
                     else

                         h->direct_cache[scan8[0] - 1 + 2*8]= 0;

                 }
             }
 
             if(FRAME_MBAFF){
 #define MAP_MVS\
                     MAP_F2F(scan8[0] - 1 - 1*8, topleft_type)\
                     MAP_F2F(scan8[0] + 0 - 1*8, top_type)\
                     MAP_F2F(scan8[0] + 1 - 1*8, top_type)\
                     MAP_F2F(scan8[0] + 2 - 1*8, top_type)\
                     MAP_F2F(scan8[0] + 3 - 1*8, top_type)\
                     MAP_F2F(scan8[0] + 4 - 1*8, topright_type)\
                     MAP_F2F(scan8[0] - 1 + 0*8, left_type[0])\
                     MAP_F2F(scan8[0] - 1 + 1*8, left_type[0])\
                     MAP_F2F(scan8[0] - 1 + 2*8, left_type[1])\
                     MAP_F2F(scan8[0] - 1 + 3*8, left_type[1])
                 if(MB_FIELD){
 #define MAP_F2F(idx, mb_type)\
                     if(!IS_INTERLACED(mb_type) && h->ref_cache[list][idx] >= 0){\
                         h->ref_cache[list][idx] <<= 1;\
                         h->mv_cache[list][idx][1] /= 2;\
                         h->mvd_cache[list][idx][1] /= 2;\
                     }
                     MAP_MVS
 #undef MAP_F2F
                 }else{
 #define MAP_F2F(idx, mb_type)\
                     if(IS_INTERLACED(mb_type) && h->ref_cache[list][idx] >= 0){\
                         h->ref_cache[list][idx] >>= 1;\
                         h->mv_cache[list][idx][1] <<= 1;\
                         h->mvd_cache[list][idx][1] <<= 1;\

                     }

                     MAP_MVS
 #undef MAP_F2F

                 }

             }

         }
     }
 #endif

 
     h->neighbor_transform_size= !!IS_8x8DCT(top_type) + !!IS_8x8DCT(left_type[0]);

 }
 
 static inline void write_back_intra_pred_mode(H264Context *h){

     const int mb_xy= h->mb_xy;

 
     h->intra4x4_pred_mode[mb_xy][0]= h->intra4x4_pred_mode_cache[7+8*1];
     h->intra4x4_pred_mode[mb_xy][1]= h->intra4x4_pred_mode_cache[7+8*2];
     h->intra4x4_pred_mode[mb_xy][2]= h->intra4x4_pred_mode_cache[7+8*3];
     h->intra4x4_pred_mode[mb_xy][3]= h->intra4x4_pred_mode_cache[7+8*4];
     h->intra4x4_pred_mode[mb_xy][4]= h->intra4x4_pred_mode_cache[4+8*4];
     h->intra4x4_pred_mode[mb_xy][5]= h->intra4x4_pred_mode_cache[5+8*4];
     h->intra4x4_pred_mode[mb_xy][6]= h->intra4x4_pred_mode_cache[6+8*4];
 }
 
 /**
  * checks if the top & left blocks are available if needed & changes the dc mode so it only uses the available blocks.
  */
 static inline int check_intra4x4_pred_mode(H264Context *h){
     MpegEncContext * const s = &h->s;
     static const int8_t top [12]= {-1, 0,LEFT_DC_PRED,-1,-1,-1,-1,-1, 0};
     static const int8_t left[12]= { 0,-1, TOP_DC_PRED, 0,-1,-1,-1, 0,-1,DC_128_PRED};
     int i;

     if(!(h->top_samples_available&0x8000)){
         for(i=0; i<4; i++){
             int status= top[ h->intra4x4_pred_mode_cache[scan8[0] + i] ];
             if(status<0){

                 av_log(h->s.avctx, AV_LOG_ERROR, "top block unavailable for requested intra4x4 mode %d at %d %d\n", status, s->mb_x, s->mb_y);

                 return -1;
             } else if(status){
                 h->intra4x4_pred_mode_cache[scan8[0] + i]= status;
             }
         }
     }

     if((h->left_samples_available&0x8888)!=0x8888){
         static const int mask[4]={0x8000,0x2000,0x80,0x20};

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

             if(!(h->left_samples_available&mask[i])){

                 int status= left[ h->intra4x4_pred_mode_cache[scan8[0] + 8*i] ];
                 if(status<0){
                     av_log(h->s.avctx, AV_LOG_ERROR, "left block unavailable for requested intra4x4 mode %d at %d %d\n", status, s->mb_x, s->mb_y);
                     return -1;
                 } else if(status){
                     h->intra4x4_pred_mode_cache[scan8[0] + 8*i]= status;
                 }

             }

         }
     }
 
     return 0;
 } //FIXME cleanup like next
 
 /**
  * checks if the top & left blocks are available if needed & changes the dc mode so it only uses the available blocks.
  */
 static inline int check_intra_pred_mode(H264Context *h, int mode){
     MpegEncContext * const s = &h->s;
     static const int8_t top [7]= {LEFT_DC_PRED8x8, 1,-1,-1};
     static const int8_t left[7]= { TOP_DC_PRED8x8,-1, 2,-1,DC_128_PRED8x8};

     if(mode > 6U) {

         av_log(h->s.avctx, AV_LOG_ERROR, "out of range intra chroma pred mode at %d %d\n", s->mb_x, s->mb_y);

         return -1;

     }

     if(!(h->top_samples_available&0x8000)){
         mode= top[ mode ];
         if(mode<0){

             av_log(h->s.avctx, AV_LOG_ERROR, "top block unavailable for requested intra mode at %d %d\n", s->mb_x, s->mb_y);

             return -1;
         }
     }

     if((h->left_samples_available&0x8080) != 0x8080){

         mode= left[ mode ];

         if(h->left_samples_available&0x8080){ //mad cow disease mode, aka MBAFF + constrained_intra_pred
             mode= ALZHEIMER_DC_L0T_PRED8x8 + (!(h->left_samples_available&0x8000)) + 2*(mode == DC_128_PRED8x8);
         }

         if(mode<0){

             av_log(h->s.avctx, AV_LOG_ERROR, "left block unavailable for requested intra mode at %d %d\n", s->mb_x, s->mb_y);

             return -1;

         }

     }
 
     return mode;
 }
 
 /**
  * gets the predicted intra4x4 prediction mode.
  */
 static inline int pred_intra_mode(H264Context *h, int n){
     const int index8= scan8[n];
     const int left= h->intra4x4_pred_mode_cache[index8 - 1];
     const int top = h->intra4x4_pred_mode_cache[index8 - 8];
     const int min= FFMIN(left, top);
 

     tprintf(h->s.avctx, "mode:%d %d min:%d\n", left ,top, min);

 
     if(min<0) return DC_PRED;
     else      return min;
 }
 
 static inline void write_back_non_zero_count(H264Context *h){

     const int mb_xy= h->mb_xy;

     h->non_zero_count[mb_xy][0]= h->non_zero_count_cache[7+8*1];
     h->non_zero_count[mb_xy][1]= h->non_zero_count_cache[7+8*2];
     h->non_zero_count[mb_xy][2]= h->non_zero_count_cache[7+8*3];

     h->non_zero_count[mb_xy][3]= h->non_zero_count_cache[7+8*4];

     h->non_zero_count[mb_xy][4]= h->non_zero_count_cache[4+8*4];
     h->non_zero_count[mb_xy][5]= h->non_zero_count_cache[5+8*4];
     h->non_zero_count[mb_xy][6]= h->non_zero_count_cache[6+8*4];

     h->non_zero_count[mb_xy][9]= h->non_zero_count_cache[1+8*2];

     h->non_zero_count[mb_xy][8]= h->non_zero_count_cache[2+8*2];

     h->non_zero_count[mb_xy][7]= h->non_zero_count_cache[2+8*1];

     h->non_zero_count[mb_xy][12]=h->non_zero_count_cache[1+8*5];

     h->non_zero_count[mb_xy][11]=h->non_zero_count_cache[2+8*5];

     h->non_zero_count[mb_xy][10]=h->non_zero_count_cache[2+8*4];

 }
 
 /**

  * gets the predicted number of non-zero coefficients.

  * @param n block index
  */
 static inline int pred_non_zero_count(H264Context *h, int n){
     const int index8= scan8[n];
     const int left= h->non_zero_count_cache[index8 - 1];
     const int top = h->non_zero_count_cache[index8 - 8];
     int i= left + top;

     if(i<64) i= (i+1)>>1;
 

     tprintf(h->s.avctx, "pred_nnz L%X T%X n%d s%d P%X\n", left, top, n, scan8[n], i&31);

 
     return i&31;
 }
 

 static inline int fetch_diagonal_mv(H264Context *h, const int16_t **C, int i, int list, int part_width){
     const int topright_ref= h->ref_cache[list][ i - 8 + part_width ];

     MpegEncContext *s = &h->s;

     /* there is no consistent mapping of mvs to neighboring locations that will
      * make mbaff happy, so we can't move all this logic to fill_caches */
     if(FRAME_MBAFF){

         const uint32_t *mb_types = s->current_picture_ptr->mb_type;

         const int16_t *mv;
         *(uint32_t*)h->mv_cache[list][scan8[0]-2] = 0;
         *C = h->mv_cache[list][scan8[0]-2];
 
         if(!MB_FIELD
            && (s->mb_y&1) && i < scan8[0]+8 && topright_ref != PART_NOT_AVAILABLE){
             int topright_xy = s->mb_x + (s->mb_y-1)*s->mb_stride + (i == scan8[0]+3);
             if(IS_INTERLACED(mb_types[topright_xy])){
 #define SET_DIAG_MV(MV_OP, REF_OP, X4, Y4)\
                 const int x4 = X4, y4 = Y4;\
                 const int mb_type = mb_types[(x4>>2)+(y4>>2)*s->mb_stride];\

                 if(!USES_LIST(mb_type,list))\

                     return LIST_NOT_USED;\
                 mv = s->current_picture_ptr->motion_val[list][x4 + y4*h->b_stride];\
                 h->mv_cache[list][scan8[0]-2][0] = mv[0];\
                 h->mv_cache[list][scan8[0]-2][1] = mv[1] MV_OP;\
                 return s->current_picture_ptr->ref_index[list][(x4>>1) + (y4>>1)*h->b8_stride] REF_OP;
 
                 SET_DIAG_MV(*2, >>1, s->mb_x*4+(i&7)-4+part_width, s->mb_y*4-1);
             }
         }
         if(topright_ref == PART_NOT_AVAILABLE
            && ((s->mb_y&1) || i >= scan8[0]+8) && (i&7)==4
            && h->ref_cache[list][scan8[0]-1] != PART_NOT_AVAILABLE){
             if(!MB_FIELD
                && IS_INTERLACED(mb_types[h->left_mb_xy[0]])){
                 SET_DIAG_MV(*2, >>1, s->mb_x*4-1, (s->mb_y|1)*4+(s->mb_y&1)*2+(i>>4)-1);
             }
             if(MB_FIELD
                && !IS_INTERLACED(mb_types[h->left_mb_xy[0]])
                && i >= scan8[0]+8){

                 // left shift will turn LIST_NOT_USED into PART_NOT_AVAILABLE, but that's OK.

                 SET_DIAG_MV(/2, <<1, s->mb_x*4-1, (s->mb_y&~1)*4 - 1 + ((i-scan8[0])>>3)*2);

             }
         }
 #undef SET_DIAG_MV
     }
 

     if(topright_ref != PART_NOT_AVAILABLE){
         *C= h->mv_cache[list][ i - 8 + part_width ];
         return topright_ref;
     }else{

         tprintf(s->avctx, "topright MV not available\n");

         *C= h->mv_cache[list][ i - 8 - 1 ];
         return h->ref_cache[list][ i - 8 - 1 ];
     }
 }
 

 /**
  * gets the predicted MV.
  * @param n the block index
  * @param part_width the width of the partition (4, 8,16) -> (1, 2, 4)
  * @param mx the x component of the predicted motion vector
  * @param my the y component of the predicted motion vector
  */
 static inline void pred_motion(H264Context * const h, int n, int part_width, int list, int ref, int * const mx, int * const my){
     const int index8= scan8[n];
     const int top_ref=      h->ref_cache[list][ index8 - 8 ];
     const int left_ref=     h->ref_cache[list][ index8 - 1 ];
     const int16_t * const A= h->mv_cache[list][ index8 - 1 ];
     const int16_t * const B= h->mv_cache[list][ index8 - 8 ];

     const int16_t * C;
     int diagonal_ref, match_count;
 

     assert(part_width==1 || part_width==2 || part_width==4);

 /* mv_cache

   B . . A T T T T

   U . . L . . , .
   U . . L . . . .
   U . . L . . , .
   . . . L . . . .
 */

 
     diagonal_ref= fetch_diagonal_mv(h, &C, index8, list, part_width);
     match_count= (diagonal_ref==ref) + (top_ref==ref) + (left_ref==ref);

     tprintf(h->s.avctx, "pred_motion match_count=%d\n", match_count);

     if(match_count > 1){ //most common
         *mx= mid_pred(A[0], B[0], C[0]);
         *my= mid_pred(A[1], B[1], C[1]);
     }else if(match_count==1){
         if(left_ref==ref){
             *mx= A[0];

             *my= A[1];

         }else if(top_ref==ref){
             *mx= B[0];

             *my= B[1];

         }else{

             *mx= C[0];

             *my= C[1];

         }
     }else{

         if(top_ref == PART_NOT_AVAILABLE && diagonal_ref == PART_NOT_AVAILABLE && left_ref != PART_NOT_AVAILABLE){

             *mx= A[0];

             *my= A[1];

         }else{

             *mx= mid_pred(A[0], B[0], C[0]);
             *my= mid_pred(A[1], B[1], C[1]);

         }
     }

     tprintf(h->s.avctx, "pred_motion (%2d %2d %2d) (%2d %2d %2d) (%2d %2d %2d) -> (%2d %2d %2d) at %2d %2d %d list %d\n", top_ref, B[0], B[1],                    diagonal_ref, C[0], C[1], left_ref, A[0], A[1], ref, *mx, *my, h->s.mb_x, h->s.mb_y, n, list);

 }
 
 /**
  * gets the directionally predicted 16x8 MV.
  * @param n the block index
  * @param mx the x component of the predicted motion vector
  * @param my the y component of the predicted motion vector
  */
 static inline void pred_16x8_motion(H264Context * const h, int n, int list, int ref, int * const mx, int * const my){
     if(n==0){
         const int top_ref=      h->ref_cache[list][ scan8[0] - 8 ];
         const int16_t * const B= h->mv_cache[list][ scan8[0] - 8 ];
 

         tprintf(h->s.avctx, "pred_16x8: (%2d %2d %2d) at %2d %2d %d list %d\n", top_ref, B[0], B[1], h->s.mb_x, h->s.mb_y, n, list);

         if(top_ref == ref){
             *mx= B[0];
             *my= B[1];
             return;
         }
     }else{
         const int left_ref=     h->ref_cache[list][ scan8[8] - 1 ];
         const int16_t * const A= h->mv_cache[list][ scan8[8] - 1 ];

         tprintf(h->s.avctx, "pred_16x8: (%2d %2d %2d) at %2d %2d %d list %d\n", left_ref, A[0], A[1], h->s.mb_x, h->s.mb_y, n, list);

 
         if(left_ref == ref){
             *mx= A[0];
             *my= A[1];
             return;
         }
     }
 
     //RARE
     pred_motion(h, n, 4, list, ref, mx, my);
 }
 
 /**
  * gets the directionally predicted 8x16 MV.
  * @param n the block index
  * @param mx the x component of the predicted motion vector
  * @param my the y component of the predicted motion vector
  */
 static inline void pred_8x16_motion(H264Context * const h, int n, int list, int ref, int * const mx, int * const my){
     if(n==0){
         const int left_ref=      h->ref_cache[list][ scan8[0] - 1 ];
         const int16_t * const A=  h->mv_cache[list][ scan8[0] - 1 ];

         tprintf(h->s.avctx, "pred_8x16: (%2d %2d %2d) at %2d %2d %d list %d\n", left_ref, A[0], A[1], h->s.mb_x, h->s.mb_y, n, list);

 
         if(left_ref == ref){
             *mx= A[0];
             *my= A[1];
             return;
         }
     }else{

         const int16_t * C;
         int diagonal_ref;
 
         diagonal_ref= fetch_diagonal_mv(h, &C, scan8[4], list, 2);

         tprintf(h->s.avctx, "pred_8x16: (%2d %2d %2d) at %2d %2d %d list %d\n", diagonal_ref, C[0], C[1], h->s.mb_x, h->s.mb_y, n, list);

         if(diagonal_ref == ref){

             *mx= C[0];
             *my= C[1];
             return;
         }
     }
 
     //RARE
     pred_motion(h, n, 2, list, ref, mx, my);
 }
 
 static inline void pred_pskip_motion(H264Context * const h, int * const mx, int * const my){
     const int top_ref = h->ref_cache[0][ scan8[0] - 8 ];
     const int left_ref= h->ref_cache[0][ scan8[0] - 1 ];
 

     tprintf(h->s.avctx, "pred_pskip: (%d) (%d) at %2d %2d\n", top_ref, left_ref, h->s.mb_x, h->s.mb_y);

 
     if(top_ref == PART_NOT_AVAILABLE || left_ref == PART_NOT_AVAILABLE

        || !( top_ref | *(uint32_t*)h->mv_cache[0][ scan8[0] - 8 ])
        || !(left_ref | *(uint32_t*)h->mv_cache[0][ scan8[0] - 1 ])){

         *mx = *my = 0;
         return;
     }

     pred_motion(h, 0, 4, 0, 0, mx, my);
 
     return;
 }
 

 static int get_scale_factor(H264Context * const h, int poc, int poc1, int i){
     int poc0 = h->ref_list[0][i].poc;
     int td = av_clip(poc1 - poc0, -128, 127);
     if(td == 0 || h->ref_list[0][i].long_ref){
         return 256;
     }else{
         int tb = av_clip(poc - poc0, -128, 127);
         int tx = (16384 + (FFABS(td) >> 1)) / td;
         return av_clip((tb*tx + 32) >> 6, -1024, 1023);
     }
 }
 

 static inline void direct_dist_scale_factor(H264Context * const h){

     MpegEncContext * const s = &h->s;
     const int poc = h->s.current_picture_ptr->field_poc[ s->picture_structure == PICT_BOTTOM_FIELD ];

     const int poc1 = h->ref_list[1][0].poc;

     int i, field;
     for(field=0; field<2; field++){
         const int poc  = h->s.current_picture_ptr->field_poc[field];
         const int poc1 = h->ref_list[1][0].field_poc[field];
         for(i=0; i < 2*h->ref_count[0]; i++)
             h->dist_scale_factor_field[field][i^field] = get_scale_factor(h, poc, poc1, i+16);

     }

 
     for(i=0; i<h->ref_count[0]; i++){
         h->dist_scale_factor[i] = get_scale_factor(h, poc, poc1, i);

     }

 }

 
 static void fill_colmap(H264Context *h, int map[2][16+32], int list, int field, int colfield, int mbafi){
     MpegEncContext * const s = &h->s;
     Picture * const ref1 = &h->ref_list[1][0];
     int j, old_ref, rfield;
     int start= mbafi ? 16                      : 0;
     int end  = mbafi ? 16+2*h->ref_count[list] : h->ref_count[list];
     int interl= mbafi || s->picture_structure != PICT_FRAME;
 
     /* bogus; fills in for missing frames */
     memset(map[list], 0, sizeof(map[list]));
 
     for(rfield=0; rfield<2; rfield++){
         for(old_ref=0; old_ref<ref1->ref_count[colfield][list]; old_ref++){
             int poc = ref1->ref_poc[colfield][list][old_ref];
 
             if     (!interl)
                 poc |= 3;
             else if( interl && (poc&3) == 3) //FIXME store all MBAFF references so this isnt needed
                 poc= (poc&~3) + rfield + 1;
 
             for(j=start; j<end; j++){
                 if(4*h->ref_list[list][j].frame_num + (h->ref_list[list][j].reference&3) == poc){
                     int cur_ref= mbafi ? (j-16)^field : j;
                     map[list][2*old_ref + (rfield^field) + 16] = cur_ref;
                     if(rfield == field)
                         map[list][old_ref] = cur_ref;
                     break;
                 }
             }
         }
     }
 }
 

 static inline void direct_ref_list_init(H264Context * const h){
     MpegEncContext * const s = &h->s;
     Picture * const ref1 = &h->ref_list[1][0];
     Picture * const cur = s->current_picture_ptr;

     int list, j, field;

     int sidx= (s->picture_structure&1)^1;
     int ref1sidx= (ref1->reference&1)^1;

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

         cur->ref_count[sidx][list] = h->ref_count[list];

         for(j=0; j<h->ref_count[list]; j++)

             cur->ref_poc[sidx][list][j] = 4*h->ref_list[list][j].frame_num + (h->ref_list[list][j].reference&3);

     }

     if(s->picture_structure == PICT_FRAME){

         memcpy(cur->ref_count[1], cur->ref_count[0], sizeof(cur->ref_count[0]));
         memcpy(cur->ref_poc  [1], cur->ref_poc  [0], sizeof(cur->ref_poc  [0]));

     }

     cur->mbaff= FRAME_MBAFF;

     if(cur->pict_type != FF_B_TYPE || h->direct_spatial_mv_pred)

         return;

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

         fill_colmap(h, h->map_col_to_list0, list, sidx, ref1sidx, 0);
         for(field=0; field<2; field++)
             fill_colmap(h, h->map_col_to_list0_field[field], list, field, field, 1);

     }
 }

 
 static inline void pred_direct_motion(H264Context * const h, int *mb_type){
     MpegEncContext * const s = &h->s;

     int b8_stride = h->b8_stride;
     int b4_stride = h->b_stride;
     int mb_xy = h->mb_xy;
     int mb_type_col[2];
     const int16_t (*l1mv0)[2], (*l1mv1)[2];
     const int8_t *l1ref0, *l1ref1;

     const int is_b8x8 = IS_8X8(*mb_type);

     unsigned int sub_mb_type;

     int i8, i4;
 

 #define MB_TYPE_16x16_OR_INTRA (MB_TYPE_16x16|MB_TYPE_INTRA4x4|MB_TYPE_INTRA16x16|MB_TYPE_INTRA_PCM)

 
     if(IS_INTERLACED(h->ref_list[1][0].mb_type[mb_xy])){ // AFL/AFR/FR/FL -> AFL/FL

         if(!IS_INTERLACED(*mb_type)){                    //     AFR/FR    -> AFL/FL

             int cur_poc = s->current_picture_ptr->poc;
             int *col_poc = h->ref_list[1]->field_poc;
             int col_parity = FFABS(col_poc[0] - cur_poc) >= FFABS(col_poc[1] - cur_poc);
             mb_xy= s->mb_x + ((s->mb_y&~1) + col_parity)*s->mb_stride;
             b8_stride = 0;

         }else if(!(s->picture_structure & h->ref_list[1][0].reference) && !h->ref_list[1][0].mbaff){// FL -> FL & differ parity

             int fieldoff= 2*(h->ref_list[1][0].reference)-3;
             mb_xy += s->mb_stride*fieldoff;
         }
         goto single_col;
     }else{                                               // AFL/AFR/FR/FL -> AFR/FR
         if(IS_INTERLACED(*mb_type)){                     // AFL       /FL -> AFR/FR
             mb_xy= s->mb_x + (s->mb_y&~1)*s->mb_stride;
             mb_type_col[0] = h->ref_list[1][0].mb_type[mb_xy];
             mb_type_col[1] = h->ref_list[1][0].mb_type[mb_xy + s->mb_stride];
             b8_stride *= 3;
             b4_stride *= 6;
             //FIXME IS_8X8(mb_type_col[0]) && !h->sps.direct_8x8_inference_flag
             if(    (mb_type_col[0] & MB_TYPE_16x16_OR_INTRA)
                 && (mb_type_col[1] & MB_TYPE_16x16_OR_INTRA)
                 && !is_b8x8){
                 sub_mb_type = MB_TYPE_16x16|MB_TYPE_P0L0|MB_TYPE_P0L1|MB_TYPE_DIRECT2; /* B_SUB_8x8 */
                 *mb_type   |= MB_TYPE_16x8 |MB_TYPE_L0L1|MB_TYPE_DIRECT2; /* B_16x8 */
             }else{
                 sub_mb_type = MB_TYPE_16x16|MB_TYPE_P0L0|MB_TYPE_P0L1|MB_TYPE_DIRECT2; /* B_SUB_8x8 */
                 *mb_type   |= MB_TYPE_8x8|MB_TYPE_L0L1;
             }
         }else{                                           //     AFR/FR    -> AFR/FR
 single_col:
             mb_type_col[0] =
             mb_type_col[1] = h->ref_list[1][0].mb_type[mb_xy];

             if(IS_8X8(mb_type_col[0]) && !h->sps.direct_8x8_inference_flag){
                 /* FIXME save sub mb types from previous frames (or derive from MVs)
                 * so we know exactly what block size to use */
                 sub_mb_type = MB_TYPE_8x8|MB_TYPE_P0L0|MB_TYPE_P0L1|MB_TYPE_DIRECT2; /* B_SUB_4x4 */
                 *mb_type   |= MB_TYPE_8x8|MB_TYPE_L0L1;
             }else if(!is_b8x8 && (mb_type_col[0] & MB_TYPE_16x16_OR_INTRA)){
                 sub_mb_type = MB_TYPE_16x16|MB_TYPE_P0L0|MB_TYPE_P0L1|MB_TYPE_DIRECT2; /* B_SUB_8x8 */
                 *mb_type   |= MB_TYPE_16x16|MB_TYPE_P0L0|MB_TYPE_P0L1|MB_TYPE_DIRECT2; /* B_16x16 */
             }else{
                 sub_mb_type = MB_TYPE_16x16|MB_TYPE_P0L0|MB_TYPE_P0L1|MB_TYPE_DIRECT2; /* B_SUB_8x8 */
                 *mb_type   |= MB_TYPE_8x8|MB_TYPE_L0L1;
             }

         }

     }
 

     l1mv0  = &h->ref_list[1][0].motion_val[0][h->mb2b_xy [mb_xy]];
     l1mv1  = &h->ref_list[1][0].motion_val[1][h->mb2b_xy [mb_xy]];
     l1ref0 = &h->ref_list[1][0].ref_index [0][h->mb2b8_xy[mb_xy]];
     l1ref1 = &h->ref_list[1][0].ref_index [1][h->mb2b8_xy[mb_xy]];

     if(!b8_stride){
         if(s->mb_y&1){
             l1ref0 += h->b8_stride;
             l1ref1 += h->b8_stride;
             l1mv0  +=  2*b4_stride;
             l1mv1  +=  2*b4_stride;
         }

     }

     if(h->direct_spatial_mv_pred){
         int ref[2];
         int mv[2][2];
         int list;
 

         /* FIXME interlacing + spatial direct uses wrong colocated block positions */
 

         /* ref = min(neighbors) */
         for(list=0; list<2; list++){
             int refa = h->ref_cache[list][scan8[0] - 1];
             int refb = h->ref_cache[list][scan8[0] - 8];
             int refc = h->ref_cache[list][scan8[0] - 8 + 4];

             if(refc == PART_NOT_AVAILABLE)

                 refc = h->ref_cache[list][scan8[0] - 8 - 1];

             ref[list] = FFMIN3((unsigned)refa, (unsigned)refb, (unsigned)refc);

             if(ref[list] < 0)
                 ref[list] = -1;
         }
 
         if(ref[0] < 0 && ref[1] < 0){
             ref[0] = ref[1] = 0;
             mv[0][0] = mv[0][1] =
             mv[1][0] = mv[1][1] = 0;
         }else{
             for(list=0; list<2; list++){
                 if(ref[list] >= 0)
                     pred_motion(h, 0, 4, list, ref[list], &mv[list][0], &mv[list][1]);
                 else
                     mv[list][0] = mv[list][1] = 0;
             }
         }
 
         if(ref[1] < 0){

             if(!is_b8x8)
                 *mb_type &= ~MB_TYPE_L1;
             sub_mb_type &= ~MB_TYPE_L1;

         }else if(ref[0] < 0){

             if(!is_b8x8)
                 *mb_type &= ~MB_TYPE_L0;
             sub_mb_type &= ~MB_TYPE_L0;

         }
 

         if(IS_INTERLACED(*mb_type) != IS_INTERLACED(mb_type_col[0])){

             for(i8=0; i8<4; i8++){
                 int x8 = i8&1;
                 int y8 = i8>>1;
                 int xy8 = x8+y8*b8_stride;
                 int xy4 = 3*x8+y8*b4_stride;
                 int a=0, b=0;
 
                 if(is_b8x8 && !IS_DIRECT(h->sub_mb_type[i8]))
                     continue;
                 h->sub_mb_type[i8] = sub_mb_type;
 
                 fill_rectangle(&h->ref_cache[0][scan8[i8*4]], 2, 2, 8, (uint8_t)ref[0], 1);
                 fill_rectangle(&h->ref_cache[1][scan8[i8*4]], 2, 2, 8, (uint8_t)ref[1], 1);

                 if(!IS_INTRA(mb_type_col[y8])

                    && (   (l1ref0[xy8] == 0 && FFABS(l1mv0[xy4][0]) <= 1 && FFABS(l1mv0[xy4][1]) <= 1)
                        || (l1ref0[xy8]  < 0 && l1ref1[xy8] == 0 && FFABS(l1mv1[xy4][0]) <= 1 && FFABS(l1mv1[xy4][1]) <= 1))){
                     if(ref[0] > 0)
                         a= pack16to32(mv[0][0],mv[0][1]);
                     if(ref[1] > 0)
                         b= pack16to32(mv[1][0],mv[1][1]);
                 }else{
                     a= pack16to32(mv[0][0],mv[0][1]);
                     b= pack16to32(mv[1][0],mv[1][1]);
                 }
                 fill_rectangle(&h->mv_cache[0][scan8[i8*4]], 2, 2, 8, a, 4);
                 fill_rectangle(&h->mv_cache[1][scan8[i8*4]], 2, 2, 8, b, 4);
             }
         }else if(IS_16X16(*mb_type)){

             int a=0, b=0;
 

             fill_rectangle(&h->ref_cache[0][scan8[0]], 4, 4, 8, (uint8_t)ref[0], 1);
             fill_rectangle(&h->ref_cache[1][scan8[0]], 4, 4, 8, (uint8_t)ref[1], 1);

             if(!IS_INTRA(mb_type_col[0])

                && (   (l1ref0[0] == 0 && FFABS(l1mv0[0][0]) <= 1 && FFABS(l1mv0[0][1]) <= 1)
                    || (l1ref0[0]  < 0 && l1ref1[0] == 0 && FFABS(l1mv1[0][0]) <= 1 && FFABS(l1mv1[0][1]) <= 1

                        && (h->x264_build>33 || !h->x264_build)))){

                 if(ref[0] > 0)

                     a= pack16to32(mv[0][0],mv[0][1]);

                 if(ref[1] > 0)

                     b= pack16to32(mv[1][0],mv[1][1]);

             }else{

                 a= pack16to32(mv[0][0],mv[0][1]);
                 b= pack16to32(mv[1][0],mv[1][1]);

             }

             fill_rectangle(&h->mv_cache[0][scan8[0]], 4, 4, 8, a, 4);
             fill_rectangle(&h->mv_cache[1][scan8[0]], 4, 4, 8, b, 4);

         }else{
             for(i8=0; i8<4; i8++){
                 const int x8 = i8&1;
                 const int y8 = i8>>1;

                 if(is_b8x8 && !IS_DIRECT(h->sub_mb_type[i8]))
                     continue;
                 h->sub_mb_type[i8] = sub_mb_type;

                 fill_rectangle(&h->mv_cache[0][scan8[i8*4]], 2, 2, 8, pack16to32(mv[0][0],mv[0][1]), 4);
                 fill_rectangle(&h->mv_cache[1][scan8[i8*4]], 2, 2, 8, pack16to32(mv[1][0],mv[1][1]), 4);

                 fill_rectangle(&h->ref_cache[0][scan8[i8*4]], 2, 2, 8, (uint8_t)ref[0], 1);
                 fill_rectangle(&h->ref_cache[1][scan8[i8*4]], 2, 2, 8, (uint8_t)ref[1], 1);

                 /* col_zero_flag */

                 if(!IS_INTRA(mb_type_col[0]) && (   l1ref0[x8 + y8*b8_stride] == 0
                                               || (l1ref0[x8 + y8*b8_stride] < 0 && l1ref1[x8 + y8*b8_stride] == 0

                                                   && (h->x264_build>33 || !h->x264_build)))){

                     const int16_t (*l1mv)[2]= l1ref0[x8 + y8*b8_stride] == 0 ? l1mv0 : l1mv1;

                     if(IS_SUB_8X8(sub_mb_type)){

                         const int16_t *mv_col = l1mv[x8*3 + y8*3*b4_stride];

                         if(FFABS(mv_col[0]) <= 1 && FFABS(mv_col[1]) <= 1){

                             if(ref[0] == 0)
                                 fill_rectangle(&h->mv_cache[0][scan8[i8*4]], 2, 2, 8, 0, 4);
                             if(ref[1] == 0)
                                 fill_rectangle(&h->mv_cache[1][scan8[i8*4]], 2, 2, 8, 0, 4);
                         }
                     }else

                     for(i4=0; i4<4; i4++){

                         const int16_t *mv_col = l1mv[x8*2 + (i4&1) + (y8*2 + (i4>>1))*b4_stride];

                         if(FFABS(mv_col[0]) <= 1 && FFABS(mv_col[1]) <= 1){

                             if(ref[0] == 0)
                                 *(uint32_t*)h->mv_cache[0][scan8[i8*4+i4]] = 0;
                             if(ref[1] == 0)
                                 *(uint32_t*)h->mv_cache[1][scan8[i8*4+i4]] = 0;
                         }
                     }
                 }
             }
         }
     }else{ /* direct temporal mv pred */

         const int *map_col_to_list0[2] = {h->map_col_to_list0[0], h->map_col_to_list0[1]};
         const int *dist_scale_factor = h->dist_scale_factor;

         int ref_offset= 0;

         if(FRAME_MBAFF && IS_INTERLACED(*mb_type)){

             map_col_to_list0[0] = h->map_col_to_list0_field[s->mb_y&1][0];
             map_col_to_list0[1] = h->map_col_to_list0_field[s->mb_y&1][1];
             dist_scale_factor   =h->dist_scale_factor_field[s->mb_y&1];

         }

         if(h->ref_list[1][0].mbaff && IS_INTERLACED(mb_type_col[0]))

             ref_offset += 16;

         if(IS_INTERLACED(*mb_type) != IS_INTERLACED(mb_type_col[0])){
             /* FIXME assumes direct_8x8_inference == 1 */

             int y_shift  = 2*!IS_INTERLACED(*mb_type);

             for(i8=0; i8<4; i8++){
                 const int x8 = i8&1;
                 const int y8 = i8>>1;
                 int ref0, scale;
                 const int16_t (*l1mv)[2]= l1mv0;

                 if(is_b8x8 && !IS_DIRECT(h->sub_mb_type[i8]))
                     continue;
                 h->sub_mb_type[i8] = sub_mb_type;
 
                 fill_rectangle(&h->ref_cache[1][scan8[i8*4]], 2, 2, 8, 0, 1);
                 if(IS_INTRA(mb_type_col[y8])){
                     fill_rectangle(&h->ref_cache[0][scan8[i8*4]], 2, 2, 8, 0, 1);
                     fill_rectangle(&h-> mv_cache[0][scan8[i8*4]], 2, 2, 8, 0, 4);
                     fill_rectangle(&h-> mv_cache[1][scan8[i8*4]], 2, 2, 8, 0, 4);
                     continue;
                 }
 
                 ref0 = l1ref0[x8 + y8*b8_stride];
                 if(ref0 >= 0)

                     ref0 = map_col_to_list0[0][ref0 + ref_offset];

                 else{

                     ref0 = map_col_to_list0[1][l1ref1[x8 + y8*b8_stride] + ref_offset];

                     l1mv= l1mv1;
                 }
                 scale = dist_scale_factor[ref0];
                 fill_rectangle(&h->ref_cache[0][scan8[i8*4]], 2, 2, 8, ref0, 1);
 
                 {
                     const int16_t *mv_col = l1mv[x8*3 + y8*b4_stride];
                     int my_col = (mv_col[1]<<y_shift)/2;
                     int mx = (scale * mv_col[0] + 128) >> 8;
                     int my = (scale * my_col + 128) >> 8;
                     fill_rectangle(&h->mv_cache[0][scan8[i8*4]], 2, 2, 8, pack16to32(mx,my), 4);
                     fill_rectangle(&h->mv_cache[1][scan8[i8*4]], 2, 2, 8, pack16to32(mx-mv_col[0],my-my_col), 4);

                 }
             }

             return;
         }

 
         /* one-to-one mv scaling */
 

         if(IS_16X16(*mb_type)){

             int ref, mv0, mv1;
 

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

             if(IS_INTRA(mb_type_col[0])){

                 ref=mv0=mv1=0;

             }else{

                 const int ref0 = l1ref0[0] >= 0 ? map_col_to_list0[0][l1ref0[0] + ref_offset]
                                                 : map_col_to_list0[1][l1ref1[0] + ref_offset];

                 const int scale = dist_scale_factor[ref0];

                 const int16_t *mv_col = l1ref0[0] >= 0 ? l1mv0[0] : l1mv1[0];

                 int mv_l0[2];

                 mv_l0[0] = (scale * mv_col[0] + 128) >> 8;
                 mv_l0[1] = (scale * mv_col[1] + 128) >> 8;

                 ref= ref0;
                 mv0= pack16to32(mv_l0[0],mv_l0[1]);
                 mv1= pack16to32(mv_l0[0]-mv_col[0],mv_l0[1]-mv_col[1]);

             }

             fill_rectangle(&h->ref_cache[0][scan8[0]], 4, 4, 8, ref, 1);
             fill_rectangle(&h-> mv_cache[0][scan8[0]], 4, 4, 8, mv0, 4);
             fill_rectangle(&h-> mv_cache[1][scan8[0]], 4, 4, 8, mv1, 4);

         }else{
             for(i8=0; i8<4; i8++){
                 const int x8 = i8&1;
                 const int y8 = i8>>1;

                 int ref0, scale;

                 const int16_t (*l1mv)[2]= l1mv0;

                 if(is_b8x8 && !IS_DIRECT(h->sub_mb_type[i8]))
                     continue;
                 h->sub_mb_type[i8] = sub_mb_type;

                 fill_rectangle(&h->ref_cache[1][scan8[i8*4]], 2, 2, 8, 0, 1);

                 if(IS_INTRA(mb_type_col[0])){

                     fill_rectangle(&h->ref_cache[0][scan8[i8*4]], 2, 2, 8, 0, 1);
                     fill_rectangle(&h-> mv_cache[0][scan8[i8*4]], 2, 2, 8, 0, 4);
                     fill_rectangle(&h-> mv_cache[1][scan8[i8*4]], 2, 2, 8, 0, 4);
                     continue;
                 }

                 ref0 = l1ref0[x8 + y8*b8_stride] + ref_offset;

                 if(ref0 >= 0)

                     ref0 = map_col_to_list0[0][ref0];

                 else{

                     ref0 = map_col_to_list0[1][l1ref1[x8 + y8*b8_stride] + ref_offset];

                     l1mv= l1mv1;
                 }

                 scale = dist_scale_factor[ref0];

                 fill_rectangle(&h->ref_cache[0][scan8[i8*4]], 2, 2, 8, ref0, 1);

                 if(IS_SUB_8X8(sub_mb_type)){

                     const int16_t *mv_col = l1mv[x8*3 + y8*3*b4_stride];

                     int mx = (scale * mv_col[0] + 128) >> 8;
                     int my = (scale * mv_col[1] + 128) >> 8;

                     fill_rectangle(&h->mv_cache[0][scan8[i8*4]], 2, 2, 8, pack16to32(mx,my), 4);
                     fill_rectangle(&h->mv_cache[1][scan8[i8*4]], 2, 2, 8, pack16to32(mx-mv_col[0],my-mv_col[1]), 4);
                 }else

                 for(i4=0; i4<4; i4++){

                     const int16_t *mv_col = l1mv[x8*2 + (i4&1) + (y8*2 + (i4>>1))*b4_stride];

                     int16_t *mv_l0 = h->mv_cache[0][scan8[i8*4+i4]];

                     mv_l0[0] = (scale * mv_col[0] + 128) >> 8;
                     mv_l0[1] = (scale * mv_col[1] + 128) >> 8;

                     *(uint32_t*)h->mv_cache[1][scan8[i8*4+i4]] =
                         pack16to32(mv_l0[0]-mv_col[0],mv_l0[1]-mv_col[1]);
                 }
             }
         }
     }
 }
 

 static inline void write_back_motion(H264Context *h, int mb_type){
     MpegEncContext * const s = &h->s;
     const int b_xy = 4*s->mb_x + 4*s->mb_y*h->b_stride;
     const int b8_xy= 2*s->mb_x + 2*s->mb_y*h->b8_stride;
     int list;
 

     if(!USES_LIST(mb_type, 0))
         fill_rectangle(&s->current_picture.ref_index[0][b8_xy], 2, 2, h->b8_stride, (uint8_t)LIST_NOT_USED, 1);
 

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

         int y;

         if(!USES_LIST(mb_type, list))

             continue;

         for(y=0; y<4; y++){
             *(uint64_t*)s->current_picture.motion_val[list][b_xy + 0 + y*h->b_stride]= *(uint64_t*)h->mv_cache[list][scan8[0]+0 + 8*y];
             *(uint64_t*)s->current_picture.motion_val[list][b_xy + 2 + y*h->b_stride]= *(uint64_t*)h->mv_cache[list][scan8[0]+2 + 8*y];
         }

         if( h->pps.cabac ) {

             if(IS_SKIP(mb_type))
                 fill_rectangle(h->mvd_table[list][b_xy], 4, 4, h->b_stride, 0, 4);
             else

             for(y=0; y<4; y++){
                 *(uint64_t*)h->mvd_table[list][b_xy + 0 + y*h->b_stride]= *(uint64_t*)h->mvd_cache[list][scan8[0]+0 + 8*y];
                 *(uint64_t*)h->mvd_table[list][b_xy + 2 + y*h->b_stride]= *(uint64_t*)h->mvd_cache[list][scan8[0]+2 + 8*y];
             }
         }

 
         {

             int8_t *ref_index = &s->current_picture.ref_index[list][b8_xy];

             ref_index[0+0*h->b8_stride]= h->ref_cache[list][scan8[0]];
             ref_index[1+0*h->b8_stride]= h->ref_cache[list][scan8[4]];
             ref_index[0+1*h->b8_stride]= h->ref_cache[list][scan8[8]];
             ref_index[1+1*h->b8_stride]= h->ref_cache[list][scan8[12]];

         }
     }

     if(h->slice_type_nos == FF_B_TYPE && h->pps.cabac){

         if(IS_8X8(mb_type)){

             uint8_t *direct_table = &h->direct_table[b8_xy];
             direct_table[1+0*h->b8_stride] = IS_DIRECT(h->sub_mb_type[1]) ? 1 : 0;
             direct_table[0+1*h->b8_stride] = IS_DIRECT(h->sub_mb_type[2]) ? 1 : 0;
             direct_table[1+1*h->b8_stride] = IS_DIRECT(h->sub_mb_type[3]) ? 1 : 0;

         }
     }

 }
 

 const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length){

     int i, si, di;
     uint8_t *dst;

     int bufidx;

 //    src[0]&0x80;                //forbidden bit

     h->nal_ref_idc= src[0]>>5;
     h->nal_unit_type= src[0]&0x1F;
 
     src++; length--;

 #if 0

     for(i=0; i<length; i++)
         printf("%2X ", src[i]);
 #endif

 #if HAVE_FAST_UNALIGNED
 # if HAVE_FAST_64BIT

 #   define RS 7
     for(i=0; i+1<length; i+=9){

         if(!((~*(const uint64_t*)(src+i) & (*(const uint64_t*)(src+i) - 0x0100010001000101ULL)) & 0x8000800080008080ULL))

 # else
 #   define RS 3
     for(i=0; i+1<length; i+=5){

         if(!((~*(const uint32_t*)(src+i) & (*(const uint32_t*)(src+i) - 0x01000101U)) & 0x80008080U))

 # endif
             continue;
         if(i>0 && !src[i]) i--;
         while(src[i]) i++;
 #else
 #   define RS 0

     for(i=0; i+1<length; i+=2){
         if(src[i]) continue;
         if(i>0 && src[i-1]==0) i--;

 #endif

         if(i+2<length && src[i+1]==0 && src[i+2]<=3){
             if(src[i+2]!=3){
                 /* startcode, so we must be past the end */
                 length=i;
             }
             break;
         }

         i-= RS;

     }
 
     if(i>=length-1){ //no escaped 0
         *dst_length= length;
         *consumed= length+1; //+1 for the header

         return src;

     }
 

     bufidx = h->nal_unit_type == NAL_DPC ? 1 : 0; // use second escape buffer for inter data

     h->rbsp_buffer[bufidx]= av_fast_realloc(h->rbsp_buffer[bufidx], &h->rbsp_buffer_size[bufidx], length+FF_INPUT_BUFFER_PADDING_SIZE);

     dst= h->rbsp_buffer[bufidx];

     if (dst == NULL){
         return NULL;
     }
 

 //printf("decoding esc\n");

     memcpy(dst, src, i);
     si=di=i;
     while(si+2<length){

         //remove escapes (very rare 1:2^22)

         if(src[si+2]>3){
             dst[di++]= src[si++];
             dst[di++]= src[si++];
         }else if(src[si]==0 && src[si+1]==0){

             if(src[si+2]==3){ //escape
                 dst[di++]= 0;
                 dst[di++]= 0;
                 si+=3;

                 continue;

             }else //next start code

                 goto nsc;

         }
 
         dst[di++]= src[si++];
     }

     while(si<length)
         dst[di++]= src[si++];
 nsc:

     memset(dst+di, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 

     *dst_length= di;
     *consumed= si + 1;//+1 for the header

 //FIXME store exact number of bits in the getbitcontext (it is needed for decoding)

     return dst;
 }
 

 int ff_h264_decode_rbsp_trailing(H264Context *h, const uint8_t *src){

     int v= *src;
     int r;
 

     tprintf(h->s.avctx, "rbsp trailing %X\n", v);

 
     for(r=1; r<9; r++){
         if(v&1) return r;
         v>>=1;
     }
     return 0;
 }
 
 /**

  * IDCT transforms the 16 dc values and dequantizes them.

  * @param qp quantization parameter
  */

 static void h264_luma_dc_dequant_idct_c(DCTELEM *block, int qp, int qmul){

 #define stride 16
     int i;
     int temp[16]; //FIXME check if this is a good idea
     static const int x_offset[4]={0, 1*stride, 4* stride,  5*stride};
     static const int y_offset[4]={0, 2*stride, 8* stride, 10*stride};
 
 //memset(block, 64, 2*256);
 //return;
     for(i=0; i<4; i++){
         const int offset= y_offset[i];
         const int z0= block[offset+stride*0] + block[offset+stride*4];
         const int z1= block[offset+stride*0] - block[offset+stride*4];
         const int z2= block[offset+stride*1] - block[offset+stride*5];
         const int z3= block[offset+stride*1] + block[offset+stride*5];
 
         temp[4*i+0]= z0+z3;
         temp[4*i+1]= z1+z2;
         temp[4*i+2]= z1-z2;
         temp[4*i+3]= z0-z3;
     }
 
     for(i=0; i<4; i++){
         const int offset= x_offset[i];
         const int z0= temp[4*0+i] + temp[4*2+i];
         const int z1= temp[4*0+i] - temp[4*2+i];
         const int z2= temp[4*1+i] - temp[4*3+i];
         const int z3= temp[4*1+i] + temp[4*3+i];
 

         block[stride*0 +offset]= ((((z0 + z3)*qmul + 128 ) >> 8)); //FIXME think about merging this into decode_residual

         block[stride*2 +offset]= ((((z1 + z2)*qmul + 128 ) >> 8));
         block[stride*8 +offset]= ((((z1 - z2)*qmul + 128 ) >> 8));
         block[stride*10+offset]= ((((z0 - z3)*qmul + 128 ) >> 8));

     }
 }
 

 #if 0

 /**

  * DCT transforms the 16 dc values.

  * @param qp quantization parameter ??? FIXME
  */
 static void h264_luma_dc_dct_c(DCTELEM *block/*, int qp*/){
 //    const int qmul= dequant_coeff[qp][0];
     int i;
     int temp[16]; //FIXME check if this is a good idea
     static const int x_offset[4]={0, 1*stride, 4* stride,  5*stride};
     static const int y_offset[4]={0, 2*stride, 8* stride, 10*stride};
 
     for(i=0; i<4; i++){
         const int offset= y_offset[i];
         const int z0= block[offset+stride*0] + block[offset+stride*4];
         const int z1= block[offset+stride*0] - block[offset+stride*4];
         const int z2= block[offset+stride*1] - block[offset+stride*5];
         const int z3= block[offset+stride*1] + block[offset+stride*5];
 
         temp[4*i+0]= z0+z3;
         temp[4*i+1]= z1+z2;
         temp[4*i+2]= z1-z2;
         temp[4*i+3]= z0-z3;
     }
 
     for(i=0; i<4; i++){
         const int offset= x_offset[i];
         const int z0= temp[4*0+i] + temp[4*2+i];
         const int z1= temp[4*0+i] - temp[4*2+i];
         const int z2= temp[4*1+i] - temp[4*3+i];
         const int z3= temp[4*1+i] + temp[4*3+i];
 
         block[stride*0 +offset]= (z0 + z3)>>1;
         block[stride*2 +offset]= (z1 + z2)>>1;
         block[stride*8 +offset]= (z1 - z2)>>1;
         block[stride*10+offset]= (z0 - z3)>>1;
     }
 }

 #endif
 

 #undef xStride
 #undef stride
 

 static void chroma_dc_dequant_idct_c(DCTELEM *block, int qp, int qmul){

     const int stride= 16*2;
     const int xStride= 16;
     int a,b,c,d,e;
 
     a= block[stride*0 + xStride*0];
     b= block[stride*0 + xStride*1];
     c= block[stride*1 + xStride*0];
     d= block[stride*1 + xStride*1];
 
     e= a-b;
     a= a+b;
     b= c-d;
     c= c+d;
 

     block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7;
     block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7;
     block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7;
     block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7;

 }
 

 #if 0

 static void chroma_dc_dct_c(DCTELEM *block){
     const int stride= 16*2;
     const int xStride= 16;
     int a,b,c,d,e;
 
     a= block[stride*0 + xStride*0];
     b= block[stride*0 + xStride*1];
     c= block[stride*1 + xStride*0];
     d= block[stride*1 + xStride*1];
 
     e= a-b;
     a= a+b;
     b= c-d;
     c= c+d;
 
     block[stride*0 + xStride*0]= (a+c);
     block[stride*0 + xStride*1]= (e+b);
     block[stride*1 + xStride*0]= (a-c);
     block[stride*1 + xStride*1]= (e-b);
 }

 #endif

 
 /**
  * gets the chroma qp.
  */

 static inline int get_chroma_qp(H264Context *h, int t, int qscale){

     return h->pps.chroma_qp_table[t][qscale];

 }
 
 static inline void mc_dir_part(H264Context *h, Picture *pic, int n, int square, int chroma_height, int delta, int list,
                            uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
                            int src_x_offset, int src_y_offset,
                            qpel_mc_func *qpix_op, h264_chroma_mc_func chroma_op){
     MpegEncContext * const s = &h->s;
     const int mx= h->mv_cache[list][ scan8[n] ][0] + src_x_offset*8;

     int my=       h->mv_cache[list][ scan8[n] ][1] + src_y_offset*8;

     const int luma_xy= (mx&3) + ((my&3)<<2);

     uint8_t * src_y = pic->data[0] + (mx>>2) + (my>>2)*h->mb_linesize;
     uint8_t * src_cb, * src_cr;
     int extra_width= h->emu_edge_width;
     int extra_height= h->emu_edge_height;

     int emu=0;
     const int full_mx= mx>>2;
     const int full_my= my>>2;

     const int pic_width  = 16*s->mb_width;

     const int pic_height = 16*s->mb_height >> MB_FIELD;

     if(mx&7) extra_width -= 3;
     if(my&7) extra_height -= 3;

 
     if(   full_mx < 0-extra_width
        || full_my < 0-extra_height
        || full_mx + 16/*FIXME*/ > pic_width + extra_width

        || full_my + 16/*FIXME*/ > pic_height + extra_height){

         ff_emulated_edge_mc(s->edge_emu_buffer, src_y - 2 - 2*h->mb_linesize, h->mb_linesize, 16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);
             src_y= s->edge_emu_buffer + 2 + 2*h->mb_linesize;

         emu=1;
     }

     qpix_op[luma_xy](dest_y, src_y, h->mb_linesize); //FIXME try variable height perhaps?

     if(!square){

         qpix_op[luma_xy](dest_y + delta, src_y + delta, h->mb_linesize);

     }

     if(CONFIG_GRAY && s->flags&CODEC_FLAG_GRAY) return;

     if(MB_FIELD){

         // chroma offset when predicting from a field of opposite parity

         my += 2 * ((s->mb_y & 1) - (pic->reference - 1));

         emu |= (my>>3) < 0 || (my>>3) + 8 >= (pic_height>>1);
     }
     src_cb= pic->data[1] + (mx>>3) + (my>>3)*h->mb_uvlinesize;
     src_cr= pic->data[2] + (mx>>3) + (my>>3)*h->mb_uvlinesize;
 

     if(emu){

         ff_emulated_edge_mc(s->edge_emu_buffer, src_cb, h->mb_uvlinesize, 9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

             src_cb= s->edge_emu_buffer;
     }

     chroma_op(dest_cb, src_cb, h->mb_uvlinesize, chroma_height, mx&7, my&7);

 
     if(emu){

         ff_emulated_edge_mc(s->edge_emu_buffer, src_cr, h->mb_uvlinesize, 9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

             src_cr= s->edge_emu_buffer;
     }

     chroma_op(dest_cr, src_cr, h->mb_uvlinesize, chroma_height, mx&7, my&7);

 }
 

 static inline void mc_part_std(H264Context *h, int n, int square, int chroma_height, int delta,

                            uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
                            int x_offset, int y_offset,
                            qpel_mc_func *qpix_put, h264_chroma_mc_func chroma_put,
                            qpel_mc_func *qpix_avg, h264_chroma_mc_func chroma_avg,
                            int list0, int list1){
     MpegEncContext * const s = &h->s;
     qpel_mc_func *qpix_op=  qpix_put;
     h264_chroma_mc_func chroma_op= chroma_put;

     dest_y  += 2*x_offset + 2*y_offset*h->  mb_linesize;
     dest_cb +=   x_offset +   y_offset*h->mb_uvlinesize;
     dest_cr +=   x_offset +   y_offset*h->mb_uvlinesize;

     x_offset += 8*s->mb_x;

     y_offset += 8*(s->mb_y >> MB_FIELD);

     if(list0){

         Picture *ref= &h->ref_list[0][ h->ref_cache[0][ scan8[n] ] ];

         mc_dir_part(h, ref, n, square, chroma_height, delta, 0,
                            dest_y, dest_cb, dest_cr, x_offset, y_offset,
                            qpix_op, chroma_op);
 
         qpix_op=  qpix_avg;
         chroma_op= chroma_avg;
     }
 
     if(list1){

         Picture *ref= &h->ref_list[1][ h->ref_cache[1][ scan8[n] ] ];

         mc_dir_part(h, ref, n, square, chroma_height, delta, 1,
                            dest_y, dest_cb, dest_cr, x_offset, y_offset,
                            qpix_op, chroma_op);
     }
 }
 

 static inline void mc_part_weighted(H264Context *h, int n, int square, int chroma_height, int delta,
                            uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
                            int x_offset, int y_offset,
                            qpel_mc_func *qpix_put, h264_chroma_mc_func chroma_put,
                            h264_weight_func luma_weight_op, h264_weight_func chroma_weight_op,
                            h264_biweight_func luma_weight_avg, h264_biweight_func chroma_weight_avg,
                            int list0, int list1){
     MpegEncContext * const s = &h->s;
 

     dest_y  += 2*x_offset + 2*y_offset*h->  mb_linesize;
     dest_cb +=   x_offset +   y_offset*h->mb_uvlinesize;
     dest_cr +=   x_offset +   y_offset*h->mb_uvlinesize;

     x_offset += 8*s->mb_x;

     y_offset += 8*(s->mb_y >> MB_FIELD);

     if(list0 && list1){
         /* don't optimize for luma-only case, since B-frames usually
          * use implicit weights => chroma too. */
         uint8_t *tmp_cb = s->obmc_scratchpad;

         uint8_t *tmp_cr = s->obmc_scratchpad + 8;
         uint8_t *tmp_y  = s->obmc_scratchpad + 8*h->mb_uvlinesize;

         int refn0 = h->ref_cache[0][ scan8[n] ];
         int refn1 = h->ref_cache[1][ scan8[n] ];
 
         mc_dir_part(h, &h->ref_list[0][refn0], n, square, chroma_height, delta, 0,
                     dest_y, dest_cb, dest_cr,
                     x_offset, y_offset, qpix_put, chroma_put);
         mc_dir_part(h, &h->ref_list[1][refn1], n, square, chroma_height, delta, 1,
                     tmp_y, tmp_cb, tmp_cr,
                     x_offset, y_offset, qpix_put, chroma_put);
 
         if(h->use_weight == 2){
             int weight0 = h->implicit_weight[refn0][refn1];
             int weight1 = 64 - weight0;

             luma_weight_avg(  dest_y,  tmp_y,  h->  mb_linesize, 5, weight0, weight1, 0);
             chroma_weight_avg(dest_cb, tmp_cb, h->mb_uvlinesize, 5, weight0, weight1, 0);
             chroma_weight_avg(dest_cr, tmp_cr, h->mb_uvlinesize, 5, weight0, weight1, 0);

         }else{

             luma_weight_avg(dest_y, tmp_y, h->mb_linesize, h->luma_log2_weight_denom,

                             h->luma_weight[0][refn0], h->luma_weight[1][refn1],

                             h->luma_offset[0][refn0] + h->luma_offset[1][refn1]);

             chroma_weight_avg(dest_cb, tmp_cb, h->mb_uvlinesize, h->chroma_log2_weight_denom,

                             h->chroma_weight[0][refn0][0], h->chroma_weight[1][refn1][0],

                             h->chroma_offset[0][refn0][0] + h->chroma_offset[1][refn1][0]);

             chroma_weight_avg(dest_cr, tmp_cr, h->mb_uvlinesize, h->chroma_log2_weight_denom,

                             h->chroma_weight[0][refn0][1], h->chroma_weight[1][refn1][1],

                             h->chroma_offset[0][refn0][1] + h->chroma_offset[1][refn1][1]);

         }
     }else{
         int list = list1 ? 1 : 0;
         int refn = h->ref_cache[list][ scan8[n] ];
         Picture *ref= &h->ref_list[list][refn];
         mc_dir_part(h, ref, n, square, chroma_height, delta, list,
                     dest_y, dest_cb, dest_cr, x_offset, y_offset,
                     qpix_put, chroma_put);
 

         luma_weight_op(dest_y, h->mb_linesize, h->luma_log2_weight_denom,

                        h->luma_weight[list][refn], h->luma_offset[list][refn]);
         if(h->use_weight_chroma){

             chroma_weight_op(dest_cb, h->mb_uvlinesize, h->chroma_log2_weight_denom,

                              h->chroma_weight[list][refn][0], h->chroma_offset[list][refn][0]);

             chroma_weight_op(dest_cr, h->mb_uvlinesize, h->chroma_log2_weight_denom,

                              h->chroma_weight[list][refn][1], h->chroma_offset[list][refn][1]);
         }
     }
 }
 
 static inline void mc_part(H264Context *h, int n, int square, int chroma_height, int delta,
                            uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
                            int x_offset, int y_offset,
                            qpel_mc_func *qpix_put, h264_chroma_mc_func chroma_put,
                            qpel_mc_func *qpix_avg, h264_chroma_mc_func chroma_avg,

                            h264_weight_func *weight_op, h264_biweight_func *weight_avg,

                            int list0, int list1){
     if((h->use_weight==2 && list0 && list1
         && (h->implicit_weight[ h->ref_cache[0][scan8[n]] ][ h->ref_cache[1][scan8[n]] ] != 32))
        || h->use_weight==1)
         mc_part_weighted(h, n, square, chroma_height, delta, dest_y, dest_cb, dest_cr,
                          x_offset, y_offset, qpix_put, chroma_put,
                          weight_op[0], weight_op[3], weight_avg[0], weight_avg[3], list0, list1);
     else
         mc_part_std(h, n, square, chroma_height, delta, dest_y, dest_cb, dest_cr,
                     x_offset, y_offset, qpix_put, chroma_put, qpix_avg, chroma_avg, list0, list1);
 }
 

 static inline void prefetch_motion(H264Context *h, int list){
     /* fetch pixels for estimated mv 4 macroblocks ahead
      * optimized for 64byte cache lines */
     MpegEncContext * const s = &h->s;
     const int refn = h->ref_cache[list][scan8[0]];
     if(refn >= 0){
         const int mx= (h->mv_cache[list][scan8[0]][0]>>2) + 16*s->mb_x + 8;
         const int my= (h->mv_cache[list][scan8[0]][1]>>2) + 16*s->mb_y;
         uint8_t **src= h->ref_list[list][refn].data;

         int off= mx + (my + (s->mb_x&3)*4)*h->mb_linesize + 64;

         s->dsp.prefetch(src[0]+off, s->linesize, 4);
         off= (mx>>1) + ((my>>1) + (s->mb_x&7))*s->uvlinesize + 64;
         s->dsp.prefetch(src[1]+off, src[2]-src[1], 2);
     }
 }
 

 static void hl_motion(H264Context *h, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
                       qpel_mc_func (*qpix_put)[16], h264_chroma_mc_func (*chroma_put),

                       qpel_mc_func (*qpix_avg)[16], h264_chroma_mc_func (*chroma_avg),
                       h264_weight_func *weight_op, h264_biweight_func *weight_avg){

     MpegEncContext * const s = &h->s;

     const int mb_xy= h->mb_xy;

     const int mb_type= s->current_picture.mb_type[mb_xy];

     assert(IS_INTER(mb_type));

     prefetch_motion(h, 0);
 

     if(IS_16X16(mb_type)){
         mc_part(h, 0, 1, 8, 0, dest_y, dest_cb, dest_cr, 0, 0,
                 qpix_put[0], chroma_put[0], qpix_avg[0], chroma_avg[0],

                 &weight_op[0], &weight_avg[0],

                 IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));
     }else if(IS_16X8(mb_type)){
         mc_part(h, 0, 0, 4, 8, dest_y, dest_cb, dest_cr, 0, 0,
                 qpix_put[1], chroma_put[0], qpix_avg[1], chroma_avg[0],

                 &weight_op[1], &weight_avg[1],

                 IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));
         mc_part(h, 8, 0, 4, 8, dest_y, dest_cb, dest_cr, 0, 4,
                 qpix_put[1], chroma_put[0], qpix_avg[1], chroma_avg[0],

                 &weight_op[1], &weight_avg[1],

                 IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1));
     }else if(IS_8X16(mb_type)){

         mc_part(h, 0, 0, 8, 8*h->mb_linesize, dest_y, dest_cb, dest_cr, 0, 0,

                 qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],

                 &weight_op[2], &weight_avg[2],

                 IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));

         mc_part(h, 4, 0, 8, 8*h->mb_linesize, dest_y, dest_cb, dest_cr, 4, 0,

                 qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],

                 &weight_op[2], &weight_avg[2],

                 IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1));
     }else{
         int i;

         assert(IS_8X8(mb_type));
 
         for(i=0; i<4; i++){
             const int sub_mb_type= h->sub_mb_type[i];
             const int n= 4*i;
             int x_offset= (i&1)<<2;
             int y_offset= (i&2)<<1;
 
             if(IS_SUB_8X8(sub_mb_type)){
                 mc_part(h, n, 1, 4, 0, dest_y, dest_cb, dest_cr, x_offset, y_offset,
                     qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],

                     &weight_op[3], &weight_avg[3],

                     IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
             }else if(IS_SUB_8X4(sub_mb_type)){
                 mc_part(h, n  , 0, 2, 4, dest_y, dest_cb, dest_cr, x_offset, y_offset,
                     qpix_put[2], chroma_put[1], qpix_avg[2], chroma_avg[1],

                     &weight_op[4], &weight_avg[4],

                     IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
                 mc_part(h, n+2, 0, 2, 4, dest_y, dest_cb, dest_cr, x_offset, y_offset+2,
                     qpix_put[2], chroma_put[1], qpix_avg[2], chroma_avg[1],

                     &weight_op[4], &weight_avg[4],

                     IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
             }else if(IS_SUB_4X8(sub_mb_type)){

                 mc_part(h, n  , 0, 4, 4*h->mb_linesize, dest_y, dest_cb, dest_cr, x_offset, y_offset,

                     qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],

                     &weight_op[5], &weight_avg[5],

                     IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));

                 mc_part(h, n+1, 0, 4, 4*h->mb_linesize, dest_y, dest_cb, dest_cr, x_offset+2, y_offset,

                     qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],

                     &weight_op[5], &weight_avg[5],

                     IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
             }else{
                 int j;
                 assert(IS_SUB_4X4(sub_mb_type));
                 for(j=0; j<4; j++){
                     int sub_x_offset= x_offset + 2*(j&1);
                     int sub_y_offset= y_offset +   (j&2);
                     mc_part(h, n+j, 1, 2, 0, dest_y, dest_cb, dest_cr, sub_x_offset, sub_y_offset,
                         qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],

                         &weight_op[6], &weight_avg[6],

                         IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
                 }
             }
         }
     }

 
     prefetch_motion(h, 1);

 }
 

 static av_cold void init_cavlc_level_tab(void){
     int suffix_length, mask;
     unsigned int i;
 
     for(suffix_length=0; suffix_length<7; suffix_length++){
         for(i=0; i<(1<<LEVEL_TAB_BITS); i++){
             int prefix= LEVEL_TAB_BITS - av_log2(2*i);
             int level_code= (prefix<<suffix_length) + (i>>(LEVEL_TAB_BITS-prefix-1-suffix_length)) - (1<<suffix_length);
 
             mask= -(level_code&1);
             level_code= (((2+level_code)>>1) ^ mask) - mask;
             if(prefix + 1 + suffix_length <= LEVEL_TAB_BITS){
                 cavlc_level_tab[suffix_length][i][0]= level_code;
                 cavlc_level_tab[suffix_length][i][1]= prefix + 1 + suffix_length;
             }else if(prefix + 1 <= LEVEL_TAB_BITS){
                 cavlc_level_tab[suffix_length][i][0]= prefix+100;
                 cavlc_level_tab[suffix_length][i][1]= prefix + 1;
             }else{
                 cavlc_level_tab[suffix_length][i][0]= LEVEL_TAB_BITS+100;
                 cavlc_level_tab[suffix_length][i][1]= LEVEL_TAB_BITS;
             }
         }
     }
 }
 

 static av_cold void decode_init_vlc(void){

     static int done = 0;
 
     if (!done) {
         int i;

         int offset;

         done = 1;
 

         chroma_dc_coeff_token_vlc.table = chroma_dc_coeff_token_vlc_table;
         chroma_dc_coeff_token_vlc.table_allocated = chroma_dc_coeff_token_vlc_table_size;

         init_vlc(&chroma_dc_coeff_token_vlc, CHROMA_DC_COEFF_TOKEN_VLC_BITS, 4*5,

                  &chroma_dc_coeff_token_len [0], 1, 1,

                  &chroma_dc_coeff_token_bits[0], 1, 1,
                  INIT_VLC_USE_NEW_STATIC);

         offset = 0;

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

             coeff_token_vlc[i].table = coeff_token_vlc_tables+offset;
             coeff_token_vlc[i].table_allocated = coeff_token_vlc_tables_size[i];

             init_vlc(&coeff_token_vlc[i], COEFF_TOKEN_VLC_BITS, 4*17,

                      &coeff_token_len [i][0], 1, 1,

                      &coeff_token_bits[i][0], 1, 1,
                      INIT_VLC_USE_NEW_STATIC);
             offset += coeff_token_vlc_tables_size[i];

         }

         /*
          * This is a one time safety check to make sure that
          * the packed static coeff_token_vlc table sizes
          * were initialized correctly.
          */

         assert(offset == FF_ARRAY_ELEMS(coeff_token_vlc_tables));

 
         for(i=0; i<3; i++){

             chroma_dc_total_zeros_vlc[i].table = chroma_dc_total_zeros_vlc_tables[i];
             chroma_dc_total_zeros_vlc[i].table_allocated = chroma_dc_total_zeros_vlc_tables_size;
             init_vlc(&chroma_dc_total_zeros_vlc[i],
                      CHROMA_DC_TOTAL_ZEROS_VLC_BITS, 4,

                      &chroma_dc_total_zeros_len [i][0], 1, 1,

                      &chroma_dc_total_zeros_bits[i][0], 1, 1,
                      INIT_VLC_USE_NEW_STATIC);

         }
         for(i=0; i<15; i++){

             total_zeros_vlc[i].table = total_zeros_vlc_tables[i];
             total_zeros_vlc[i].table_allocated = total_zeros_vlc_tables_size;
             init_vlc(&total_zeros_vlc[i],
                      TOTAL_ZEROS_VLC_BITS, 16,

                      &total_zeros_len [i][0], 1, 1,

                      &total_zeros_bits[i][0], 1, 1,
                      INIT_VLC_USE_NEW_STATIC);

         }
 
         for(i=0; i<6; i++){

             run_vlc[i].table = run_vlc_tables[i];
             run_vlc[i].table_allocated = run_vlc_tables_size;
             init_vlc(&run_vlc[i],
                      RUN_VLC_BITS, 7,

                      &run_len [i][0], 1, 1,

                      &run_bits[i][0], 1, 1,
                      INIT_VLC_USE_NEW_STATIC);

         }

         run7_vlc.table = run7_vlc_table,
         run7_vlc.table_allocated = run7_vlc_table_size;

         init_vlc(&run7_vlc, RUN7_VLC_BITS, 16,

                  &run_len [6][0], 1, 1,

                  &run_bits[6][0], 1, 1,
                  INIT_VLC_USE_NEW_STATIC);

 
         init_cavlc_level_tab();

     }
 }
 
 static void free_tables(H264Context *h){

     int i;

     H264Context *hx;

     av_freep(&h->intra4x4_pred_mode);

     av_freep(&h->chroma_pred_mode_table);
     av_freep(&h->cbp_table);

     av_freep(&h->mvd_table[0]);
     av_freep(&h->mvd_table[1]);

     av_freep(&h->direct_table);

     av_freep(&h->non_zero_count);
     av_freep(&h->slice_table_base);
     h->slice_table= NULL;

     av_freep(&h->mb2b_xy);
     av_freep(&h->mb2b8_xy);

     for(i = 0; i < h->s.avctx->thread_count; i++) {
         hx = h->thread_context[i];
         if(!hx) continue;
         av_freep(&hx->top_borders[1]);
         av_freep(&hx->top_borders[0]);
         av_freep(&hx->s.obmc_scratchpad);
     }

 }
 

 static void init_dequant8_coeff_table(H264Context *h){
     int i,q,x;

     const int transpose = (h->s.dsp.h264_idct8_add != ff_h264_idct8_add_c); //FIXME ugly

     h->dequant8_coeff[0] = h->dequant8_buffer[0];
     h->dequant8_coeff[1] = h->dequant8_buffer[1];
 
     for(i=0; i<2; i++ ){
         if(i && !memcmp(h->pps.scaling_matrix8[0], h->pps.scaling_matrix8[1], 64*sizeof(uint8_t))){
             h->dequant8_coeff[1] = h->dequant8_buffer[0];
             break;
         }
 
         for(q=0; q<52; q++){

             int shift = div6[q];
             int idx = rem6[q];

             for(x=0; x<64; x++)

                 h->dequant8_coeff[i][q][transpose ? (x>>3)|((x&7)<<3) : x] =
                     ((uint32_t)dequant8_coeff_init[idx][ dequant8_coeff_init_scan[((x>>1)&12) | (x&3)] ] *
                     h->pps.scaling_matrix8[i][x]) << shift;

         }
     }
 }
 
 static void init_dequant4_coeff_table(H264Context *h){
     int i,j,q,x;

     const int transpose = (h->s.dsp.h264_idct_add != ff_h264_idct_add_c); //FIXME ugly

     for(i=0; i<6; i++ ){
         h->dequant4_coeff[i] = h->dequant4_buffer[i];
         for(j=0; j<i; j++){
             if(!memcmp(h->pps.scaling_matrix4[j], h->pps.scaling_matrix4[i], 16*sizeof(uint8_t))){
                 h->dequant4_coeff[i] = h->dequant4_buffer[j];
                 break;
             }
         }
         if(j<i)
             continue;
 
         for(q=0; q<52; q++){

             int shift = div6[q] + 2;
             int idx = rem6[q];

             for(x=0; x<16; x++)

                 h->dequant4_coeff[i][q][transpose ? (x>>2)|((x<<2)&0xF) : x] =
                     ((uint32_t)dequant4_coeff_init[idx][(x&1) + ((x>>2)&1)] *

                     h->pps.scaling_matrix4[i][x]) << shift;
         }
     }
 }
 
 static void init_dequant_tables(H264Context *h){
     int i,x;
     init_dequant4_coeff_table(h);
     if(h->pps.transform_8x8_mode)
         init_dequant8_coeff_table(h);
     if(h->sps.transform_bypass){
         for(i=0; i<6; i++)
             for(x=0; x<16; x++)
                 h->dequant4_coeff[i][0][x] = 1<<6;
         if(h->pps.transform_8x8_mode)
             for(i=0; i<2; i++)
                 for(x=0; x<64; x++)
                     h->dequant8_coeff[i][0][x] = 1<<6;
     }
 }
 
 

 /**
  * allocates tables.

  * needs width/height

  */
 static int alloc_tables(H264Context *h){
     MpegEncContext * const s = &h->s;

     const int big_mb_num= s->mb_stride * (s->mb_height+1);

     int x,y;

 
     CHECKED_ALLOCZ(h->intra4x4_pred_mode, big_mb_num * 8  * sizeof(uint8_t))

     CHECKED_ALLOCZ(h->non_zero_count    , big_mb_num * 16 * sizeof(uint8_t))

     CHECKED_ALLOCZ(h->slice_table_base  , (big_mb_num+s->mb_stride) * sizeof(*h->slice_table_base))

     CHECKED_ALLOCZ(h->cbp_table, big_mb_num * sizeof(uint16_t))

     CHECKED_ALLOCZ(h->chroma_pred_mode_table, big_mb_num * sizeof(uint8_t))
     CHECKED_ALLOCZ(h->mvd_table[0], 32*big_mb_num * sizeof(uint16_t));
     CHECKED_ALLOCZ(h->mvd_table[1], 32*big_mb_num * sizeof(uint16_t));
     CHECKED_ALLOCZ(h->direct_table, 32*big_mb_num * sizeof(uint8_t));

     memset(h->slice_table_base, -1, (big_mb_num+s->mb_stride)  * sizeof(*h->slice_table_base));

     h->slice_table= h->slice_table_base + s->mb_stride*2 + 1;

     CHECKED_ALLOCZ(h->mb2b_xy  , big_mb_num * sizeof(uint32_t));
     CHECKED_ALLOCZ(h->mb2b8_xy , big_mb_num * sizeof(uint32_t));

     for(y=0; y<s->mb_height; y++){
         for(x=0; x<s->mb_width; x++){

             const int mb_xy= x + y*s->mb_stride;

             const int b_xy = 4*x + 4*y*h->b_stride;
             const int b8_xy= 2*x + 2*y*h->b8_stride;

             h->mb2b_xy [mb_xy]= b_xy;
             h->mb2b8_xy[mb_xy]= b8_xy;
         }
     }

     s->obmc_scratchpad = NULL;
 

     if(!h->dequant4_coeff[0])
         init_dequant_tables(h);
 

     return 0;
 fail:
     free_tables(h);
     return -1;
 }
 

 /**
  * Mimic alloc_tables(), but for every context thread.
  */
 static void clone_tables(H264Context *dst, H264Context *src){
     dst->intra4x4_pred_mode       = src->intra4x4_pred_mode;
     dst->non_zero_count           = src->non_zero_count;
     dst->slice_table              = src->slice_table;
     dst->cbp_table                = src->cbp_table;
     dst->mb2b_xy                  = src->mb2b_xy;
     dst->mb2b8_xy                 = src->mb2b8_xy;
     dst->chroma_pred_mode_table   = src->chroma_pred_mode_table;
     dst->mvd_table[0]             = src->mvd_table[0];
     dst->mvd_table[1]             = src->mvd_table[1];
     dst->direct_table             = src->direct_table;
 
     dst->s.obmc_scratchpad = NULL;
     ff_h264_pred_init(&dst->hpc, src->s.codec_id);
 }
 
 /**
  * Init context
  * Allocate buffers which are not shared amongst multiple threads.
  */
 static int context_init(H264Context *h){
     CHECKED_ALLOCZ(h->top_borders[0], h->s.mb_width * (16+8+8) * sizeof(uint8_t))
     CHECKED_ALLOCZ(h->top_borders[1], h->s.mb_width * (16+8+8) * sizeof(uint8_t))
 
     return 0;
 fail:
     return -1; // free_tables will clean up for us
 }
 

 static av_cold void common_init(H264Context *h){

     MpegEncContext * const s = &h->s;
 
     s->width = s->avctx->width;
     s->height = s->avctx->height;
     s->codec_id= s->avctx->codec->id;

     ff_h264_pred_init(&h->hpc, s->codec_id);

     h->dequant_coeff_pps= -1;

     s->unrestricted_mv=1;

     s->decode=1; //FIXME

     dsputil_init(&s->dsp, s->avctx); // needed so that idct permutation is known early
 

     memset(h->pps.scaling_matrix4, 16, 6*16*sizeof(uint8_t));
     memset(h->pps.scaling_matrix8, 16, 2*64*sizeof(uint8_t));

 }
 

 /**
  * Reset SEI values at the beginning of the frame.
  *
  * @param h H.264 context.
  */
 static void reset_sei(H264Context *h) {
     h->sei_recovery_frame_cnt       = -1;
     h->sei_dpb_output_delay         =  0;
     h->sei_cpb_removal_delay        = -1;
     h->sei_buffering_period_present =  0;
 }
 

 static av_cold int decode_init(AVCodecContext *avctx){

     H264Context *h= avctx->priv_data;
     MpegEncContext * const s = &h->s;
 

     MPV_decode_defaults(s);

     s->avctx = avctx;
     common_init(h);
 
     s->out_format = FMT_H264;
     s->workaround_bugs= avctx->workaround_bugs;
 
     // set defaults
 //    s->decode_mb= ff_h263_decode_mb;

     s->quarter_sample = 1;

     if(!avctx->has_b_frames)

     s->low_delay= 1;

     if(s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)

         avctx->pix_fmt= PIX_FMT_VDPAU_H264;

     else

         avctx->pix_fmt= avctx->get_format(avctx, avctx->codec->pix_fmts);

     avctx->hwaccel = ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);

     decode_init_vlc();

     if(avctx->extradata_size > 0 && avctx->extradata &&
        *(char *)avctx->extradata == 1){

         h->is_avc = 1;
         h->got_avcC = 0;

     } else {
         h->is_avc = 0;

     }
 

     h->thread_context[0] = h;

     h->outputed_poc = INT_MIN;

     h->prev_poc_msb= 1<<16;

     reset_sei(h);

     if(avctx->codec_id == CODEC_ID_H264){
         if(avctx->ticks_per_frame == 1){
             s->avctx->time_base.den *=2;
         }

         avctx->ticks_per_frame = 2;

     }

     return 0;
 }
 

 static int frame_start(H264Context *h){

     MpegEncContext * const s = &h->s;
     int i;
 

     if(MPV_frame_start(s, s->avctx) < 0)
         return -1;

     ff_er_frame_start(s);

     /*
      * MPV_frame_start uses pict_type to derive key_frame.
      * This is incorrect for H.264; IDR markings must be used.

      * Zero here; IDR markings per slice in frame or fields are ORed in later.

      * See decode_nal_units().
      */
     s->current_picture_ptr->key_frame= 0;

 
     assert(s->linesize && s->uvlinesize);
 
     for(i=0; i<16; i++){
         h->block_offset[i]= 4*((scan8[i] - scan8[0])&7) + 4*s->linesize*((scan8[i] - scan8[0])>>3);

         h->block_offset[24+i]= 4*((scan8[i] - scan8[0])&7) + 8*s->linesize*((scan8[i] - scan8[0])>>3);

     }
     for(i=0; i<4; i++){
         h->block_offset[16+i]=
         h->block_offset[20+i]= 4*((scan8[i] - scan8[0])&7) + 4*s->uvlinesize*((scan8[i] - scan8[0])>>3);

         h->block_offset[24+16+i]=
         h->block_offset[24+20+i]= 4*((scan8[i] - scan8[0])&7) + 8*s->uvlinesize*((scan8[i] - scan8[0])>>3);

     }
 

     /* can't be in alloc_tables because linesize isn't known there.
      * FIXME: redo bipred weight to not require extra buffer? */

     for(i = 0; i < s->avctx->thread_count; i++)
         if(!h->thread_context[i]->s.obmc_scratchpad)
             h->thread_context[i]->s.obmc_scratchpad = av_malloc(16*2*s->linesize + 8*2*s->uvlinesize);

 
     /* some macroblocks will be accessed before they're available */

     if(FRAME_MBAFF || s->avctx->thread_count > 1)

         memset(h->slice_table, -1, (s->mb_height*s->mb_stride-1) * sizeof(*h->slice_table));

 //    s->decode= (s->flags&CODEC_FLAG_PSNR) || !s->encoding || s->current_picture.reference /*|| h->contains_intra*/ || 1;

     // We mark the current picture as non-reference after allocating it, so

     // that if we break out due to an error it can be released automatically
     // in the next MPV_frame_start().
     // SVQ3 as well as most other codecs have only last/next/current and thus
     // get released even with set reference, besides SVQ3 and others do not
     // mark frames as reference later "naturally".
     if(s->codec_id != CODEC_ID_SVQ3)
         s->current_picture_ptr->reference= 0;

 
     s->current_picture_ptr->field_poc[0]=
     s->current_picture_ptr->field_poc[1]= INT_MAX;

     assert(s->current_picture_ptr->long_ref==0);

     return 0;

 }
 

 static inline void backup_mb_border(H264Context *h, uint8_t *src_y, uint8_t *src_cb, uint8_t *src_cr, int linesize, int uvlinesize, int simple){

     MpegEncContext * const s = &h->s;
     int i;

     int step    = 1;
     int offset  = 1;
     int uvoffset= 1;
     int top_idx = 1;
     int skiplast= 0;

     src_y  -=   linesize;
     src_cb -= uvlinesize;
     src_cr -= uvlinesize;
 

     if(!simple && FRAME_MBAFF){
         if(s->mb_y&1){
             offset  = MB_MBAFF ? 1 : 17;
             uvoffset= MB_MBAFF ? 1 : 9;
             if(!MB_MBAFF){
                 *(uint64_t*)(h->top_borders[0][s->mb_x]+ 0)= *(uint64_t*)(src_y +  15*linesize);
                 *(uint64_t*)(h->top_borders[0][s->mb_x]+ 8)= *(uint64_t*)(src_y +8+15*linesize);

                 if(simple || !CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

                     *(uint64_t*)(h->top_borders[0][s->mb_x]+16)= *(uint64_t*)(src_cb+7*uvlinesize);
                     *(uint64_t*)(h->top_borders[0][s->mb_x]+24)= *(uint64_t*)(src_cr+7*uvlinesize);
                 }
             }
         }else{
             if(!MB_MBAFF){
                 h->left_border[0]= h->top_borders[0][s->mb_x][15];

                 if(simple || !CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

                     h->left_border[34   ]= h->top_borders[0][s->mb_x][16+7  ];
                     h->left_border[34+18]= h->top_borders[0][s->mb_x][16+8+7];
                 }
                 skiplast= 1;
             }
             offset  =
             uvoffset=
             top_idx = MB_MBAFF ? 0 : 1;
         }
         step= MB_MBAFF ? 2 : 1;
     }
 

     // There are two lines saved, the line above the the top macroblock of a pair,

     // and the line above the bottom macroblock

     h->left_border[offset]= h->top_borders[top_idx][s->mb_x][15];
     for(i=1; i<17 - skiplast; i++){
         h->left_border[offset+i*step]= src_y[15+i*  linesize];

     }

     *(uint64_t*)(h->top_borders[top_idx][s->mb_x]+0)= *(uint64_t*)(src_y +  16*linesize);
     *(uint64_t*)(h->top_borders[top_idx][s->mb_x]+8)= *(uint64_t*)(src_y +8+16*linesize);

     if(simple || !CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

         h->left_border[uvoffset+34   ]= h->top_borders[top_idx][s->mb_x][16+7];
         h->left_border[uvoffset+34+18]= h->top_borders[top_idx][s->mb_x][24+7];
         for(i=1; i<9 - skiplast; i++){
             h->left_border[uvoffset+34   +i*step]= src_cb[7+i*uvlinesize];
             h->left_border[uvoffset+34+18+i*step]= src_cr[7+i*uvlinesize];

         }

         *(uint64_t*)(h->top_borders[top_idx][s->mb_x]+16)= *(uint64_t*)(src_cb+8*uvlinesize);
         *(uint64_t*)(h->top_borders[top_idx][s->mb_x]+24)= *(uint64_t*)(src_cr+8*uvlinesize);

     }
 }
 

 static inline void xchg_mb_border(H264Context *h, uint8_t *src_y, uint8_t *src_cb, uint8_t *src_cr, int linesize, int uvlinesize, int xchg, int simple){

     MpegEncContext * const s = &h->s;
     int temp8, i;
     uint64_t temp64;

     int deblock_left;
     int deblock_top;
     int mb_xy;

     int step    = 1;
     int offset  = 1;
     int uvoffset= 1;
     int top_idx = 1;
 
     if(!simple && FRAME_MBAFF){
         if(s->mb_y&1){
             offset  = MB_MBAFF ? 1 : 17;
             uvoffset= MB_MBAFF ? 1 : 9;
         }else{
             offset  =
             uvoffset=
             top_idx = MB_MBAFF ? 0 : 1;
         }
         step= MB_MBAFF ? 2 : 1;
     }

 
     if(h->deblocking_filter == 2) {

         mb_xy = h->mb_xy;

         deblock_left = h->slice_table[mb_xy] == h->slice_table[mb_xy - 1];
         deblock_top  = h->slice_table[mb_xy] == h->slice_table[h->top_mb_xy];
     } else {
         deblock_left = (s->mb_x > 0);

         deblock_top =  (s->mb_y > !!MB_FIELD);

     }

 
     src_y  -=   linesize + 1;
     src_cb -= uvlinesize + 1;
     src_cr -= uvlinesize + 1;
 
 #define XCHG(a,b,t,xchg)\
 t= a;\
 if(xchg)\
     a= b;\
 b= t;

 
     if(deblock_left){

         for(i = !deblock_top; i<16; i++){
             XCHG(h->left_border[offset+i*step], src_y [i*  linesize], temp8, xchg);

         }

         XCHG(h->left_border[offset+i*step], src_y [i*  linesize], temp8, 1);

     }
 
     if(deblock_top){

         XCHG(*(uint64_t*)(h->top_borders[top_idx][s->mb_x]+0), *(uint64_t*)(src_y +1), temp64, xchg);
         XCHG(*(uint64_t*)(h->top_borders[top_idx][s->mb_x]+8), *(uint64_t*)(src_y +9), temp64, 1);

         if(s->mb_x+1 < s->mb_width){

             XCHG(*(uint64_t*)(h->top_borders[top_idx][s->mb_x+1]), *(uint64_t*)(src_y +17), temp64, 1);

         }

     }
 

     if(simple || !CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

         if(deblock_left){

             for(i = !deblock_top; i<8; i++){
                 XCHG(h->left_border[uvoffset+34   +i*step], src_cb[i*uvlinesize], temp8, xchg);
                 XCHG(h->left_border[uvoffset+34+18+i*step], src_cr[i*uvlinesize], temp8, xchg);

             }

             XCHG(h->left_border[uvoffset+34   +i*step], src_cb[i*uvlinesize], temp8, 1);
             XCHG(h->left_border[uvoffset+34+18+i*step], src_cr[i*uvlinesize], temp8, 1);

         }
         if(deblock_top){

             XCHG(*(uint64_t*)(h->top_borders[top_idx][s->mb_x]+16), *(uint64_t*)(src_cb+1), temp64, 1);
             XCHG(*(uint64_t*)(h->top_borders[top_idx][s->mb_x]+24), *(uint64_t*)(src_cr+1), temp64, 1);

         }
     }
 }
 

 static av_always_inline void hl_decode_mb_internal(H264Context *h, int simple){

     MpegEncContext * const s = &h->s;
     const int mb_x= s->mb_x;
     const int mb_y= s->mb_y;

     const int mb_xy= h->mb_xy;

     const int mb_type= s->current_picture.mb_type[mb_xy];
     uint8_t  *dest_y, *dest_cb, *dest_cr;
     int linesize, uvlinesize /*dct_offset*/;
     int i;

     int *block_offset = &h->block_offset[0];

     const int transform_bypass = !simple && (s->qscale == 0 && h->sps.transform_bypass);

     /* is_h264 should always be true if SVQ3 is disabled. */

     const int is_h264 = !CONFIG_SVQ3_DECODER || simple || s->codec_id == CODEC_ID_H264;

     void (*idct_add)(uint8_t *dst, DCTELEM *block, int stride);

     void (*idct_dc_add)(uint8_t *dst, DCTELEM *block, int stride);

     dest_y  = s->current_picture.data[0] + (mb_x + mb_y * s->linesize  ) * 16;
     dest_cb = s->current_picture.data[1] + (mb_x + mb_y * s->uvlinesize) * 8;
     dest_cr = s->current_picture.data[2] + (mb_x + mb_y * s->uvlinesize) * 8;

     s->dsp.prefetch(dest_y + (s->mb_x&3)*4*s->linesize + 64, s->linesize, 4);
     s->dsp.prefetch(dest_cb + (s->mb_x&7)*s->uvlinesize + 64, dest_cr - dest_cb, 2);
 

     if (!simple && MB_FIELD) {

         linesize   = h->mb_linesize   = s->linesize * 2;
         uvlinesize = h->mb_uvlinesize = s->uvlinesize * 2;

         block_offset = &h->block_offset[24];

         if(mb_y&1){ //FIXME move out of this function?

             dest_y -= s->linesize*15;

             dest_cb-= s->uvlinesize*7;
             dest_cr-= s->uvlinesize*7;

         }

         if(FRAME_MBAFF) {
             int list;

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

                 if(!USES_LIST(mb_type, list))
                     continue;
                 if(IS_16X16(mb_type)){
                     int8_t *ref = &h->ref_cache[list][scan8[0]];

                     fill_rectangle(ref, 4, 4, 8, (16+*ref)^(s->mb_y&1), 1);

                 }else{
                     for(i=0; i<16; i+=4){
                         int ref = h->ref_cache[list][scan8[i]];
                         if(ref >= 0)

                             fill_rectangle(&h->ref_cache[list][scan8[i]], 2, 2, 8, (16+ref)^(s->mb_y&1), 1);

                     }
                 }
             }
         }

     } else {

         linesize   = h->mb_linesize   = s->linesize;
         uvlinesize = h->mb_uvlinesize = s->uvlinesize;

 //        dct_offset = s->linesize * 16;
     }

     if (!simple && IS_INTRA_PCM(mb_type)) {

         for (i=0; i<16; i++) {
             memcpy(dest_y + i*  linesize, h->mb       + i*8, 16);

         }

         for (i=0; i<8; i++) {
             memcpy(dest_cb+ i*uvlinesize, h->mb + 128 + i*4,  8);
             memcpy(dest_cr+ i*uvlinesize, h->mb + 160 + i*4,  8);

         }

     } else {
         if(IS_INTRA(mb_type)){

             if(h->deblocking_filter)

                 xchg_mb_border(h, dest_y, dest_cb, dest_cr, linesize, uvlinesize, 1, simple);

             if(simple || !CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

                 h->hpc.pred8x8[ h->chroma_pred_mode ](dest_cb, uvlinesize);
                 h->hpc.pred8x8[ h->chroma_pred_mode ](dest_cr, uvlinesize);

             }

             if(IS_INTRA4x4(mb_type)){

                 if(simple || !s->encoding){

                     if(IS_8x8DCT(mb_type)){

                         if(transform_bypass){
                             idct_dc_add =
                             idct_add    = s->dsp.add_pixels8;

                         }else{

                             idct_dc_add = s->dsp.h264_idct8_dc_add;
                             idct_add    = s->dsp.h264_idct8_add;
                         }

                         for(i=0; i<16; i+=4){
                             uint8_t * const ptr= dest_y + block_offset[i];
                             const int dir= h->intra4x4_pred_mode_cache[ scan8[i] ];

                             if(transform_bypass && h->sps.profile_idc==244 && dir<=1){
                                 h->hpc.pred8x8l_add[dir](ptr, h->mb + i*16, linesize);
                             }else{

                                 const int nnz = h->non_zero_count_cache[ scan8[i] ];
                                 h->hpc.pred8x8l[ dir ](ptr, (h->topleft_samples_available<<i)&0x8000,
                                                             (h->topright_samples_available<<i)&0x4000, linesize);
                                 if(nnz){
                                     if(nnz == 1 && h->mb[i*16])
                                         idct_dc_add(ptr, h->mb + i*16, linesize);
                                     else
                                         idct_add   (ptr, h->mb + i*16, linesize);
                                 }

                             }

                         }

                     }else{
                         if(transform_bypass){
                             idct_dc_add =
                             idct_add    = s->dsp.add_pixels4;
                         }else{
                             idct_dc_add = s->dsp.h264_idct_dc_add;
                             idct_add    = s->dsp.h264_idct_add;
                         }

                         for(i=0; i<16; i++){
                             uint8_t * const ptr= dest_y + block_offset[i];
                             const int dir= h->intra4x4_pred_mode_cache[ scan8[i] ];

                             if(transform_bypass && h->sps.profile_idc==244 && dir<=1){
                                 h->hpc.pred4x4_add[dir](ptr, h->mb + i*16, linesize);
                             }else{
                                 uint8_t *topright;
                                 int nnz, tr;
                                 if(dir == DIAG_DOWN_LEFT_PRED || dir == VERT_LEFT_PRED){
                                     const int topright_avail= (h->topright_samples_available<<i)&0x8000;
                                     assert(mb_y || linesize <= block_offset[i]);
                                     if(!topright_avail){
                                         tr= ptr[3 - linesize]*0x01010101;
                                         topright= (uint8_t*) &tr;
                                     }else
                                         topright= ptr + 4 - linesize;

                                 }else

                                     topright= NULL;
 
                                 h->hpc.pred4x4[ dir ](ptr, topright, linesize);
                                 nnz = h->non_zero_count_cache[ scan8[i] ];
                                 if(nnz){
                                     if(is_h264){
                                         if(nnz == 1 && h->mb[i*16])
                                             idct_dc_add(ptr, h->mb + i*16, linesize);
                                         else
                                             idct_add   (ptr, h->mb + i*16, linesize);
                                     }else
                                         svq3_add_idct_c(ptr, h->mb + i*16, linesize, s->qscale, 0);
                                 }

                             }

                         }

                     }

                 }

             }else{

                 h->hpc.pred16x16[ h->intra16x16_pred_mode ](dest_y , linesize);

                 if(is_h264){

                     if(!transform_bypass)

                         h264_luma_dc_dequant_idct_c(h->mb, s->qscale, h->dequant4_coeff[0][s->qscale][0]);

                 }else

                     svq3_luma_dc_dequant_idct_c(h->mb, s->qscale);

             }

             if(h->deblocking_filter)

                 xchg_mb_border(h, dest_y, dest_cb, dest_cr, linesize, uvlinesize, 0, simple);

         }else if(is_h264){

             hl_motion(h, dest_y, dest_cb, dest_cr,

                       s->me.qpel_put, s->dsp.put_h264_chroma_pixels_tab,
                       s->me.qpel_avg, s->dsp.avg_h264_chroma_pixels_tab,

                       s->dsp.weight_h264_pixels_tab, s->dsp.biweight_h264_pixels_tab);

         }

 
 
         if(!IS_INTRA4x4(mb_type)){

             if(is_h264){

                 if(IS_INTRA16x16(mb_type)){

                     if(transform_bypass){
                         if(h->sps.profile_idc==244 && (h->intra16x16_pred_mode==VERT_PRED8x8 || h->intra16x16_pred_mode==HOR_PRED8x8)){

                             h->hpc.pred16x16_add[h->intra16x16_pred_mode](dest_y, block_offset, h->mb, linesize);
                         }else{
                             for(i=0; i<16; i++){
                                 if(h->non_zero_count_cache[ scan8[i] ] || h->mb[i*16])

                                     s->dsp.add_pixels4(dest_y + block_offset[i], h->mb + i*16, linesize);

                             }

                         }
                     }else{
                          s->dsp.h264_idct_add16intra(dest_y, block_offset, h->mb, linesize, h->non_zero_count_cache);

                     }

                 }else if(h->cbp&15){

                     if(transform_bypass){

                         const int di = IS_8x8DCT(mb_type) ? 4 : 1;

                         idct_add= IS_8x8DCT(mb_type) ? s->dsp.add_pixels8 : s->dsp.add_pixels4;

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

                             if(h->non_zero_count_cache[ scan8[i] ]){

                                 idct_add(dest_y + block_offset[i], h->mb + i*16, linesize);

                             }

                         }

                     }else{
                         if(IS_8x8DCT(mb_type)){
                             s->dsp.h264_idct8_add4(dest_y, block_offset, h->mb, linesize, h->non_zero_count_cache);
                         }else{
                             s->dsp.h264_idct_add16(dest_y, block_offset, h->mb, linesize, h->non_zero_count_cache);
                         }
                     }

                 }

             }else{
                 for(i=0; i<16; i++){
                     if(h->non_zero_count_cache[ scan8[i] ] || h->mb[i*16]){ //FIXME benchmark weird rule, & below

                         uint8_t * const ptr= dest_y + block_offset[i];

                         svq3_add_idct_c(ptr, h->mb + i*16, linesize, s->qscale, IS_INTRA(mb_type) ? 1 : 0);
                     }

                 }

             }
         }
 

         if((simple || !CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)) && (h->cbp&0x30)){

             uint8_t *dest[2] = {dest_cb, dest_cr};
             if(transform_bypass){

                 if(IS_INTRA(mb_type) && h->sps.profile_idc==244 && (h->chroma_pred_mode==VERT_PRED8x8 || h->chroma_pred_mode==HOR_PRED8x8)){
                     h->hpc.pred8x8_add[h->chroma_pred_mode](dest[0], block_offset + 16, h->mb + 16*16, uvlinesize);
                     h->hpc.pred8x8_add[h->chroma_pred_mode](dest[1], block_offset + 20, h->mb + 20*16, uvlinesize);
                 }else{

                     idct_add = s->dsp.add_pixels4;

                     for(i=16; i<16+8; i++){
                         if(h->non_zero_count_cache[ scan8[i] ] || h->mb[i*16])
                             idct_add   (dest[(i&4)>>2] + block_offset[i], h->mb + i*16, uvlinesize);
                     }
                 }

             }else{

                 chroma_dc_dequant_idct_c(h->mb + 16*16, h->chroma_qp[0], h->dequant4_coeff[IS_INTRA(mb_type) ? 1:4][h->chroma_qp[0]][0]);
                 chroma_dc_dequant_idct_c(h->mb + 16*16+4*16, h->chroma_qp[1], h->dequant4_coeff[IS_INTRA(mb_type) ? 2:5][h->chroma_qp[1]][0]);

                 if(is_h264){

                     idct_add = s->dsp.h264_idct_add;
                     idct_dc_add = s->dsp.h264_idct_dc_add;

                     for(i=16; i<16+8; i++){
                         if(h->non_zero_count_cache[ scan8[i] ])
                             idct_add   (dest[(i&4)>>2] + block_offset[i], h->mb + i*16, uvlinesize);
                         else if(h->mb[i*16])
                             idct_dc_add(dest[(i&4)>>2] + block_offset[i], h->mb + i*16, uvlinesize);
                     }

                 }else{
                     for(i=16; i<16+8; i++){
                         if(h->non_zero_count_cache[ scan8[i] ] || h->mb[i*16]){
                             uint8_t * const ptr= dest[(i&4)>>2] + block_offset[i];
                             svq3_add_idct_c(ptr, h->mb + i*16, uvlinesize, chroma_qp[s->qscale + 12] - 12, 2);
                         }

                     }

                 }

             }
         }
     }

     if(h->cbp || IS_INTRA(mb_type))
         s->dsp.clear_blocks(h->mb);
 

     if(h->deblocking_filter) {

         backup_mb_border(h, dest_y, dest_cb, dest_cr, linesize, uvlinesize, simple);
         fill_caches(h, mb_type, 1); //FIXME don't fill stuff which isn't used by filter_mb
         h->chroma_qp[0] = get_chroma_qp(h, 0, s->current_picture.qscale_table[mb_xy]);
         h->chroma_qp[1] = get_chroma_qp(h, 1, s->current_picture.qscale_table[mb_xy]);

         if (!simple && FRAME_MBAFF) {

             filter_mb     (h, mb_x, mb_y, dest_y, dest_cb, dest_cr, linesize, uvlinesize);

         } else {

             filter_mb_fast(h, mb_x, mb_y, dest_y, dest_cb, dest_cr, linesize, uvlinesize);

         }

     }

 }
 
 /**

  * Process a macroblock; this case avoids checks for expensive uncommon cases.
  */
 static void hl_decode_mb_simple(H264Context *h){
     hl_decode_mb_internal(h, 1);
 }
 
 /**
  * Process a macroblock; this handles edge cases, such as interlacing.
  */
 static void av_noinline hl_decode_mb_complex(H264Context *h){
     hl_decode_mb_internal(h, 0);
 }
 
 static void hl_decode_mb(H264Context *h){
     MpegEncContext * const s = &h->s;

     const int mb_xy= h->mb_xy;

     const int mb_type= s->current_picture.mb_type[mb_xy];

     int is_complex = CONFIG_SMALL || h->is_complex || IS_INTRA_PCM(mb_type) || s->qscale == 0;

 
     if (is_complex)
         hl_decode_mb_complex(h);
     else hl_decode_mb_simple(h);
 }
 

 static void pic_as_field(Picture *pic, const int parity){

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

         if (parity == PICT_BOTTOM_FIELD)

             pic->data[i] += pic->linesize[i];

         pic->reference = parity;

         pic->linesize[i] *= 2;
     }

     pic->poc= pic->field_poc[parity == PICT_BOTTOM_FIELD];

 }
 
 static int split_field_copy(Picture *dest, Picture *src,
                             int parity, int id_add){
     int match = !!(src->reference & parity);
 
     if (match) {
         *dest = *src;

         if(parity != PICT_FRAME){

             pic_as_field(dest, parity);
             dest->pic_id *= 2;
             dest->pic_id += id_add;

         }

     }
 
     return match;
 }
 

 static int build_def_list(Picture *def, Picture **in, int len, int is_long, int sel){
     int i[2]={0};
     int index=0;

     while(i[0]<len || i[1]<len){
         while(i[0]<len && !(in[ i[0] ] && (in[ i[0] ]->reference & sel)))
             i[0]++;
         while(i[1]<len && !(in[ i[1] ] && (in[ i[1] ]->reference & (sel^3))))
             i[1]++;
         if(i[0] < len){
             in[ i[0] ]->pic_id= is_long ? i[0] : in[ i[0] ]->frame_num;
             split_field_copy(&def[index++], in[ i[0]++ ], sel  , 1);
         }
         if(i[1] < len){
             in[ i[1] ]->pic_id= is_long ? i[1] : in[ i[1] ]->frame_num;
             split_field_copy(&def[index++], in[ i[1]++ ], sel^3, 0);

         }
     }
 

     return index;

 }
 

 static int add_sorted(Picture **sorted, Picture **src, int len, int limit, int dir){
     int i, best_poc;
     int out_i= 0;

     for(;;){
         best_poc= dir ? INT_MIN : INT_MAX;

         for(i=0; i<len; i++){
             const int poc= src[i]->poc;
             if(((poc > limit) ^ dir) && ((poc < best_poc) ^ dir)){
                 best_poc= poc;
                 sorted[out_i]= src[i];
             }
         }
         if(best_poc == (dir ? INT_MIN : INT_MAX))
             break;
         limit= sorted[out_i++]->poc - dir;
     }
     return out_i;

 }
 

 /**

  * fills the default_ref_list.
  */
 static int fill_default_ref_list(H264Context *h){
     MpegEncContext * const s = &h->s;

     int i, len;

     if(h->slice_type_nos==FF_B_TYPE){

         Picture *sorted[32];
         int cur_poc, list;
         int lens[2];

         if(FIELD_PICTURE)
             cur_poc= s->current_picture_ptr->field_poc[ s->picture_structure == PICT_BOTTOM_FIELD ];
         else
             cur_poc= s->current_picture_ptr->poc;

         for(list= 0; list<2; list++){
             len= add_sorted(sorted    , h->short_ref, h->short_ref_count, cur_poc, 1^list);
             len+=add_sorted(sorted+len, h->short_ref, h->short_ref_count, cur_poc, 0^list);
             assert(len<=32);
             len= build_def_list(h->default_ref_list[list]    , sorted     , len, 0, s->picture_structure);
             len+=build_def_list(h->default_ref_list[list]+len, h->long_ref, 16 , 1, s->picture_structure);
             assert(len<=32);

             if(len < h->ref_count[list])
                 memset(&h->default_ref_list[list][len], 0, sizeof(Picture)*(h->ref_count[list] - len));
             lens[list]= len;

         }
 

         if(lens[0] == lens[1] && lens[1] > 1){
             for(i=0; h->default_ref_list[0][i].data[0] == h->default_ref_list[1][i].data[0] && i<lens[0]; i++);
             if(i == lens[0])
                 FFSWAP(Picture, h->default_ref_list[1][0], h->default_ref_list[1][1]);

         }
     }else{

         len = build_def_list(h->default_ref_list[0]    , h->short_ref, h->short_ref_count, 0, s->picture_structure);
         len+= build_def_list(h->default_ref_list[0]+len, h-> long_ref, 16                , 1, s->picture_structure);
         assert(len <= 32);
         if(len < h->ref_count[0])
             memset(&h->default_ref_list[0][len], 0, sizeof(Picture)*(h->ref_count[0] - len));

     }

 #ifdef TRACE
     for (i=0; i<h->ref_count[0]; i++) {

         tprintf(h->s.avctx, "List0: %s fn:%d 0x%p\n", (h->default_ref_list[0][i].long_ref ? "LT" : "ST"), h->default_ref_list[0][i].pic_id, h->default_ref_list[0][i].data[0]);

     }

     if(h->slice_type_nos==FF_B_TYPE){

         for (i=0; i<h->ref_count[1]; i++) {

             tprintf(h->s.avctx, "List1: %s fn:%d 0x%p\n", (h->default_ref_list[1][i].long_ref ? "LT" : "ST"), h->default_ref_list[1][i].pic_id, h->default_ref_list[1][i].data[0]);

         }
     }
 #endif

     return 0;
 }
 

 static void print_short_term(H264Context *h);
 static void print_long_term(H264Context *h);
 

 /**
  * Extract structure information about the picture described by pic_num in
  * the current decoding context (frame or field). Note that pic_num is
  * picture number without wrapping (so, 0<=pic_num<max_pic_num).
  * @param pic_num picture number for which to extract structure information
  * @param structure one of PICT_XXX describing structure of picture
  *                      with pic_num
  * @return frame number (short term) or long term index of picture
  *         described by pic_num
  */
 static int pic_num_extract(H264Context *h, int pic_num, int *structure){
     MpegEncContext * const s = &h->s;
 
     *structure = s->picture_structure;
     if(FIELD_PICTURE){
         if (!(pic_num & 1))
             /* opposite field */
             *structure ^= PICT_FRAME;
         pic_num >>= 1;
     }
 
     return pic_num;
 }
 

 static int decode_ref_pic_list_reordering(H264Context *h){
     MpegEncContext * const s = &h->s;

     int list, index, pic_structure;

     print_short_term(h);
     print_long_term(h);

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

         memcpy(h->ref_list[list], h->default_ref_list[list], sizeof(Picture)*h->ref_count[list]);
 
         if(get_bits1(&s->gb)){
             int pred= h->curr_pic_num;
 
             for(index=0; ; index++){

                 unsigned int reordering_of_pic_nums_idc= get_ue_golomb_31(&s->gb);

                 unsigned int pic_id;

                 int i;

                 Picture *ref = NULL;

 
                 if(reordering_of_pic_nums_idc==3)

                     break;

                 if(index >= h->ref_count[list]){

                     av_log(h->s.avctx, AV_LOG_ERROR, "reference count overflow\n");

                     return -1;
                 }

                 if(reordering_of_pic_nums_idc<3){
                     if(reordering_of_pic_nums_idc<2){

                         const unsigned int abs_diff_pic_num= get_ue_golomb(&s->gb) + 1;

                         int frame_num;

                         if(abs_diff_pic_num > h->max_pic_num){

                             av_log(h->s.avctx, AV_LOG_ERROR, "abs_diff_pic_num overflow\n");

                             return -1;
                         }
 
                         if(reordering_of_pic_nums_idc == 0) pred-= abs_diff_pic_num;
                         else                                pred+= abs_diff_pic_num;
                         pred &= h->max_pic_num - 1;

                         frame_num = pic_num_extract(h, pred, &pic_structure);
 

                         for(i= h->short_ref_count-1; i>=0; i--){
                             ref = h->short_ref[i];

                             assert(ref->reference);

                             assert(!ref->long_ref);

                             if(

                                    ref->frame_num == frame_num &&
                                    (ref->reference & pic_structure)

                               )

                                 break;
                         }

                         if(i>=0)

                             ref->pic_id= pred;

                     }else{

                         int long_idx;

                         pic_id= get_ue_golomb(&s->gb); //long_term_pic_idx

 
                         long_idx= pic_num_extract(h, pic_id, &pic_structure);
 
                         if(long_idx>31){

                             av_log(h->s.avctx, AV_LOG_ERROR, "long_term_pic_idx overflow\n");
                             return -1;
                         }

                         ref = h->long_ref[long_idx];
                         assert(!(ref && !ref->reference));

                         if(ref && (ref->reference & pic_structure)){

                             ref->pic_id= pic_id;
                             assert(ref->long_ref);
                             i=0;
                         }else{
                             i=-1;
                         }

                     }
 

                     if (i < 0) {

                         av_log(h->s.avctx, AV_LOG_ERROR, "reference picture missing during reorder\n");

                         memset(&h->ref_list[list][index], 0, sizeof(Picture)); //FIXME

                     } else {
                         for(i=index; i+1<h->ref_count[list]; i++){
                             if(ref->long_ref == h->ref_list[list][i].long_ref && ref->pic_id == h->ref_list[list][i].pic_id)
                                 break;

                         }
                         for(; i > index; i--){
                             h->ref_list[list][i]= h->ref_list[list][i-1];
                         }

                         h->ref_list[list][index]= *ref;

                         if (FIELD_PICTURE){

                             pic_as_field(&h->ref_list[list][index], pic_structure);

                         }

                     }

                 }else{

                     av_log(h->s.avctx, AV_LOG_ERROR, "illegal reordering_of_pic_nums_idc\n");

                     return -1;
                 }
             }
         }
     }

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

         for(index= 0; index < h->ref_count[list]; index++){

             if(!h->ref_list[list][index].data[0]){
                 av_log(h->s.avctx, AV_LOG_ERROR, "Missing reference picture\n");
                 h->ref_list[list][index]= s->current_picture; //FIXME this is not a sensible solution
             }

         }
     }

 
     return 0;

 }
 

 static void fill_mbaff_ref_list(H264Context *h){

     int list, i, j;

     for(list=0; list<2; list++){ //FIXME try list_count

         for(i=0; i<h->ref_count[list]; i++){
             Picture *frame = &h->ref_list[list][i];
             Picture *field = &h->ref_list[list][16+2*i];
             field[0] = *frame;
             for(j=0; j<3; j++)
                 field[0].linesize[j] <<= 1;

             field[0].reference = PICT_TOP_FIELD;

             field[0].poc= field[0].field_poc[0];

             field[1] = field[0];
             for(j=0; j<3; j++)
                 field[1].data[j] += frame->linesize[j];

             field[1].reference = PICT_BOTTOM_FIELD;

             field[1].poc= field[1].field_poc[1];

 
             h->luma_weight[list][16+2*i] = h->luma_weight[list][16+2*i+1] = h->luma_weight[list][i];
             h->luma_offset[list][16+2*i] = h->luma_offset[list][16+2*i+1] = h->luma_offset[list][i];
             for(j=0; j<2; j++){
                 h->chroma_weight[list][16+2*i][j] = h->chroma_weight[list][16+2*i+1][j] = h->chroma_weight[list][i][j];
                 h->chroma_offset[list][16+2*i][j] = h->chroma_offset[list][16+2*i+1][j] = h->chroma_offset[list][i][j];
             }
         }
     }
     for(j=0; j<h->ref_count[1]; j++){
         for(i=0; i<h->ref_count[0]; i++)
             h->implicit_weight[j][16+2*i] = h->implicit_weight[j][16+2*i+1] = h->implicit_weight[j][i];
         memcpy(h->implicit_weight[16+2*j],   h->implicit_weight[j], sizeof(*h->implicit_weight));
         memcpy(h->implicit_weight[16+2*j+1], h->implicit_weight[j], sizeof(*h->implicit_weight));
     }
 }
 

 static int pred_weight_table(H264Context *h){
     MpegEncContext * const s = &h->s;
     int list, i;

     int luma_def, chroma_def;

     h->use_weight= 0;
     h->use_weight_chroma= 0;

     h->luma_log2_weight_denom= get_ue_golomb(&s->gb);
     h->chroma_log2_weight_denom= get_ue_golomb(&s->gb);

     luma_def = 1<<h->luma_log2_weight_denom;
     chroma_def = 1<<h->chroma_log2_weight_denom;

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

         h->luma_weight_flag[list]   = 0;
         h->chroma_weight_flag[list] = 0;

         for(i=0; i<h->ref_count[list]; i++){
             int luma_weight_flag, chroma_weight_flag;

             luma_weight_flag= get_bits1(&s->gb);
             if(luma_weight_flag){
                 h->luma_weight[list][i]= get_se_golomb(&s->gb);
                 h->luma_offset[list][i]= get_se_golomb(&s->gb);

                 if(   h->luma_weight[list][i] != luma_def

                    || h->luma_offset[list][i] != 0) {

                     h->use_weight= 1;

                     h->luma_weight_flag[list]= 1;
                 }

             }else{
                 h->luma_weight[list][i]= luma_def;
                 h->luma_offset[list][i]= 0;

             }
 

             if(CHROMA){

                 chroma_weight_flag= get_bits1(&s->gb);
                 if(chroma_weight_flag){
                     int j;
                     for(j=0; j<2; j++){
                         h->chroma_weight[list][i][j]= get_se_golomb(&s->gb);
                         h->chroma_offset[list][i][j]= get_se_golomb(&s->gb);
                         if(   h->chroma_weight[list][i][j] != chroma_def

                            || h->chroma_offset[list][i][j] != 0) {

                             h->use_weight_chroma= 1;

                             h->chroma_weight_flag[list]= 1;
                         }

                     }
                 }else{
                     int j;
                     for(j=0; j<2; j++){
                         h->chroma_weight[list][i][j]= chroma_def;
                         h->chroma_offset[list][i][j]= 0;
                     }

                 }
             }
         }

         if(h->slice_type_nos != FF_B_TYPE) break;

     }

     h->use_weight= h->use_weight || h->use_weight_chroma;

     return 0;
 }
 

 static void implicit_weight_table(H264Context *h){
     MpegEncContext * const s = &h->s;

     int ref0, ref1, i;

     int cur_poc = s->current_picture_ptr->poc;
 

     for (i = 0; i < 2; i++) {
         h->luma_weight_flag[i]   = 0;
         h->chroma_weight_flag[i] = 0;
     }
 

     if(   h->ref_count[0] == 1 && h->ref_count[1] == 1
        && h->ref_list[0][0].poc + h->ref_list[1][0].poc == 2*cur_poc){
         h->use_weight= 0;
         h->use_weight_chroma= 0;
         return;
     }
 
     h->use_weight= 2;
     h->use_weight_chroma= 2;
     h->luma_log2_weight_denom= 5;
     h->chroma_log2_weight_denom= 5;
 
     for(ref0=0; ref0 < h->ref_count[0]; ref0++){
         int poc0 = h->ref_list[0][ref0].poc;
         for(ref1=0; ref1 < h->ref_count[1]; ref1++){

             int poc1 = h->ref_list[1][ref1].poc;

             int td = av_clip(poc1 - poc0, -128, 127);

             if(td){

                 int tb = av_clip(cur_poc - poc0, -128, 127);

                 int tx = (16384 + (FFABS(td) >> 1)) / td;

                 int dist_scale_factor = av_clip((tb*tx + 32) >> 6, -1024, 1023) >> 2;

                 if(dist_scale_factor < -64 || dist_scale_factor > 128)
                     h->implicit_weight[ref0][ref1] = 32;
                 else
                     h->implicit_weight[ref0][ref1] = 64 - dist_scale_factor;
             }else
                 h->implicit_weight[ref0][ref1] = 32;
         }
     }
 }
 

 /**
  * Mark a picture as no longer needed for reference. The refmask
  * argument allows unreferencing of individual fields or the whole frame.
  * If the picture becomes entirely unreferenced, but is being held for
  * display purposes, it is marked as such.
  * @param refmask mask of fields to unreference; the mask is bitwise
  *                anded with the reference marking of pic
  * @return non-zero if pic becomes entirely unreferenced (except possibly
  *         for display purposes) zero if one of the fields remains in
  *         reference
  */
 static inline int unreference_pic(H264Context *h, Picture *pic, int refmask){

     int i;

     if (pic->reference &= refmask) {
         return 0;
     } else {

         for(i = 0; h->delayed_pic[i]; i++)
             if(pic == h->delayed_pic[i]){
                 pic->reference=DELAYED_PIC_REF;
                 break;
             }

         return 1;
     }

 }
 

 /**

  * instantaneous decoder refresh.

  */
 static void idr(H264Context *h){

     int i;

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

         remove_long(h, i, 0);

     }

     assert(h->long_ref_count==0);

 
     for(i=0; i<h->short_ref_count; i++){

         unreference_pic(h, h->short_ref[i], 0);

         h->short_ref[i]= NULL;
     }
     h->short_ref_count=0;

     h->prev_frame_num= 0;

     h->prev_frame_num_offset= 0;
     h->prev_poc_msb=
     h->prev_poc_lsb= 0;

 }
 

 /* forget old pics after a seek */
 static void flush_dpb(AVCodecContext *avctx){
     H264Context *h= avctx->priv_data;
     int i;

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

         if(h->delayed_pic[i])
             h->delayed_pic[i]->reference= 0;

         h->delayed_pic[i]= NULL;

     }

     h->outputed_poc= INT_MIN;

     idr(h);

     if(h->s.current_picture_ptr)
         h->s.current_picture_ptr->reference= 0;

     h->s.first_field= 0;

     reset_sei(h);

     ff_mpeg_flush(avctx);

 }
 

 /**

  * Find a Picture in the short term reference list by frame number.
  * @param frame_num frame number to search for
  * @param idx the index into h->short_ref where returned picture is found
  *            undefined if no picture found.
  * @return pointer to the found picture, or NULL if no pic with the provided
  *                 frame number is found

  */

 static Picture * find_short(H264Context *h, int frame_num, int *idx){

     MpegEncContext * const s = &h->s;

     int i;

     for(i=0; i<h->short_ref_count; i++){
         Picture *pic= h->short_ref[i];

         if(s->avctx->debug&FF_DEBUG_MMCO)

             av_log(h->s.avctx, AV_LOG_DEBUG, "%d %d %p\n", i, pic->frame_num, pic);

         if(pic->frame_num == frame_num) {
             *idx = i;

             return pic;
         }
     }
     return NULL;
 }
 
 /**

  * Remove a picture from the short term reference list by its index in
  * that list.  This does no checking on the provided index; it is assumed
  * to be valid. Other list entries are shifted down.
  * @param i index into h->short_ref of picture to remove.
  */
 static void remove_short_at_index(H264Context *h, int i){

     assert(i >= 0 && i < h->short_ref_count);

     h->short_ref[i]= NULL;
     if (--h->short_ref_count)
         memmove(&h->short_ref[i], &h->short_ref[i+1], (h->short_ref_count - i)*sizeof(Picture*));
 }
 
 /**
  *
  * @return the removed picture or NULL if an error occurs
  */

 static Picture * remove_short(H264Context *h, int frame_num, int ref_mask){

     MpegEncContext * const s = &h->s;
     Picture *pic;
     int i;
 
     if(s->avctx->debug&FF_DEBUG_MMCO)
         av_log(h->s.avctx, AV_LOG_DEBUG, "remove short %d count %d\n", frame_num, h->short_ref_count);
 
     pic = find_short(h, frame_num, &i);

     if (pic){
         if(unreference_pic(h, pic, ref_mask))

         remove_short_at_index(h, i);

     }

 
     return pic;
 }
 
 /**

  * Remove a picture from the long term reference list by its index in

  * that list.

  * @return the removed picture or NULL if an error occurs

  */

 static Picture * remove_long(H264Context *h, int i, int ref_mask){

     Picture *pic;
 
     pic= h->long_ref[i];

     if (pic){

         if(unreference_pic(h, pic, ref_mask)){
             assert(h->long_ref[i]->long_ref == 1);
             h->long_ref[i]->long_ref= 0;
             h->long_ref[i]= NULL;
             h->long_ref_count--;
         }

     }

 
     return pic;
 }
 
 /**

  * print short term list
  */
 static void print_short_term(H264Context *h) {
     uint32_t i;
     if(h->s.avctx->debug&FF_DEBUG_MMCO) {
         av_log(h->s.avctx, AV_LOG_DEBUG, "short term list:\n");
         for(i=0; i<h->short_ref_count; i++){
             Picture *pic= h->short_ref[i];
             av_log(h->s.avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", i, pic->frame_num, pic->poc, pic->data[0]);
         }
     }
 }
 
 /**
  * print long term list
  */
 static void print_long_term(H264Context *h) {
     uint32_t i;
     if(h->s.avctx->debug&FF_DEBUG_MMCO) {
         av_log(h->s.avctx, AV_LOG_DEBUG, "long term list:\n");
         for(i = 0; i < 16; i++){
             Picture *pic= h->long_ref[i];
             if (pic) {
                 av_log(h->s.avctx, AV_LOG_DEBUG, "%d fn:%d poc:%d %p\n", i, pic->frame_num, pic->poc, pic->data[0]);
             }
         }
     }
 }
 
 /**

  * Executes the reference picture marking (memory management control operations).
  */
 static int execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count){
     MpegEncContext * const s = &h->s;

     int i, j;

     int current_ref_assigned=0;

     Picture *av_uninit(pic);

     if((s->avctx->debug&FF_DEBUG_MMCO) && mmco_count==0)

         av_log(h->s.avctx, AV_LOG_DEBUG, "no mmco here\n");

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

         int structure, av_uninit(frame_num);

         if(s->avctx->debug&FF_DEBUG_MMCO)

             av_log(h->s.avctx, AV_LOG_DEBUG, "mmco:%d %d %d\n", h->mmco[i].opcode, h->mmco[i].short_pic_num, h->mmco[i].long_arg);

         if(   mmco[i].opcode == MMCO_SHORT2UNUSED
            || mmco[i].opcode == MMCO_SHORT2LONG){
             frame_num = pic_num_extract(h, mmco[i].short_pic_num, &structure);
             pic = find_short(h, frame_num, &j);
             if(!pic){

                 if(mmco[i].opcode != MMCO_SHORT2LONG || !h->long_ref[mmco[i].long_arg]
                    || h->long_ref[mmco[i].long_arg]->frame_num != frame_num)

                 av_log(h->s.avctx, AV_LOG_ERROR, "mmco: unref short failure\n");
                 continue;
             }
         }
 

         switch(mmco[i].opcode){
         case MMCO_SHORT2UNUSED:

             if(s->avctx->debug&FF_DEBUG_MMCO)
                 av_log(h->s.avctx, AV_LOG_DEBUG, "mmco: unref short %d count %d\n", h->mmco[i].short_pic_num, h->short_ref_count);

             remove_short(h, frame_num, structure ^ PICT_FRAME);

             break;
         case MMCO_SHORT2LONG:

                 if (h->long_ref[mmco[i].long_arg] != pic)
                     remove_long(h, mmco[i].long_arg, 0);

                 remove_short_at_index(h, j);
                 h->long_ref[ mmco[i].long_arg ]= pic;

                 if (h->long_ref[ mmco[i].long_arg ]){
                     h->long_ref[ mmco[i].long_arg ]->long_ref=1;
                     h->long_ref_count++;
                 }

             break;
         case MMCO_LONG2UNUSED:

             j = pic_num_extract(h, mmco[i].long_arg, &structure);
             pic = h->long_ref[j];
             if (pic) {

                 remove_long(h, j, structure ^ PICT_FRAME);

             } else if(s->avctx->debug&FF_DEBUG_MMCO)
                 av_log(h->s.avctx, AV_LOG_DEBUG, "mmco: unref long failure\n");

             break;
         case MMCO_LONG:

                     // Comment below left from previous code as it is an interresting note.

                     /* First field in pair is in short term list or
                      * at a different long term index.

                      * This is not allowed; see 7.4.3.3, notes 2 and 3.

                      * Report the problem and keep the pair where it is,
                      * and mark this field valid.
                      */
 

             if (h->long_ref[mmco[i].long_arg] != s->current_picture_ptr) {

                 remove_long(h, mmco[i].long_arg, 0);

                 h->long_ref[ mmco[i].long_arg ]= s->current_picture_ptr;
                 h->long_ref[ mmco[i].long_arg ]->long_ref=1;
                 h->long_ref_count++;

             }

             s->current_picture_ptr->reference |= s->picture_structure;

             current_ref_assigned=1;

             break;
         case MMCO_SET_MAX_LONG:

             assert(mmco[i].long_arg <= 16);

             // just remove the long term which index is greater than new max

             for(j = mmco[i].long_arg; j<16; j++){

                 remove_long(h, j, 0);

             }
             break;
         case MMCO_RESET:
             while(h->short_ref_count){

                 remove_short(h, h->short_ref[0]->frame_num, 0);

             }

             for(j = 0; j < 16; j++) {

                 remove_long(h, j, 0);

             }

             s->current_picture_ptr->poc=
             s->current_picture_ptr->field_poc[0]=
             s->current_picture_ptr->field_poc[1]=
             h->poc_lsb=
             h->poc_msb=
             h->frame_num=

             s->current_picture_ptr->frame_num= 0;

             break;
         default: assert(0);
         }
     }

     if (!current_ref_assigned) {

         /* Second field of complementary field pair; the first field of
          * which is already referenced. If short referenced, it
          * should be first entry in short_ref. If not, it must exist
          * in long_ref; trying to put it on the short list here is an

          * error in the encoded bit stream (ref: 7.4.3.3, NOTE 2 and 3).

          */
         if (h->short_ref_count && h->short_ref[0] == s->current_picture_ptr) {
             /* Just mark the second field valid */
             s->current_picture_ptr->reference = PICT_FRAME;
         } else if (s->current_picture_ptr->long_ref) {
             av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term reference "
                                              "assignment for second field "
                                              "in complementary field pair "
                                              "(first field is long term)\n");
         } else {

             pic= remove_short(h, s->current_picture_ptr->frame_num, 0);

             if(pic){
                 av_log(h->s.avctx, AV_LOG_ERROR, "illegal short term buffer state detected\n");
             }

             if(h->short_ref_count)
                 memmove(&h->short_ref[1], &h->short_ref[0], h->short_ref_count*sizeof(Picture*));

             h->short_ref[0]= s->current_picture_ptr;
             h->short_ref_count++;
             s->current_picture_ptr->reference |= s->picture_structure;
         }

     }

     if (h->long_ref_count + h->short_ref_count > h->sps.ref_frame_count){

 
         /* We have too many reference frames, probably due to corrupted
          * stream. Need to discard one frame. Prevents overrun of the
          * short_ref and long_ref buffers.
          */
         av_log(h->s.avctx, AV_LOG_ERROR,
                "number of reference frames exceeds max (probably "
                "corrupt input), discarding one\n");
 

         if (h->long_ref_count && !h->short_ref_count) {

             for (i = 0; i < 16; ++i)
                 if (h->long_ref[i])
                     break;
 
             assert(i < 16);

             remove_long(h, i, 0);

         } else {

             pic = h->short_ref[h->short_ref_count - 1];

             remove_short(h, pic->frame_num, 0);

         }
     }
 

     print_short_term(h);
     print_long_term(h);

     return 0;

 }
 

 static int decode_ref_pic_marking(H264Context *h, GetBitContext *gb){

     MpegEncContext * const s = &h->s;
     int i;

     h->mmco_index= 0;

     if(h->nal_unit_type == NAL_IDR_SLICE){ //FIXME fields

         s->broken_link= get_bits1(gb) -1;

         if(get_bits1(gb)){

             h->mmco[0].opcode= MMCO_LONG;

             h->mmco[0].long_arg= 0;

             h->mmco_index= 1;

         }

     }else{

         if(get_bits1(gb)){ // adaptive_ref_pic_marking_mode_flag

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

                 MMCOOpcode opcode= get_ue_golomb_31(gb);

 
                 h->mmco[i].opcode= opcode;
                 if(opcode==MMCO_SHORT2UNUSED || opcode==MMCO_SHORT2LONG){

                     h->mmco[i].short_pic_num= (h->curr_pic_num - get_ue_golomb(gb) - 1) & (h->max_pic_num - 1);

 /*                    if(h->mmco[i].short_pic_num >= h->short_ref_count || h->short_ref[ h->mmco[i].short_pic_num ] == NULL){

                         av_log(s->avctx, AV_LOG_ERROR, "illegal short ref in memory management control operation %d\n", mmco);

                         return -1;
                     }*/
                 }
                 if(opcode==MMCO_SHORT2LONG || opcode==MMCO_LONG2UNUSED || opcode==MMCO_LONG || opcode==MMCO_SET_MAX_LONG){

                     unsigned int long_arg= get_ue_golomb_31(gb);

                     if(long_arg >= 32 || (long_arg >= 16 && !(opcode == MMCO_LONG2UNUSED && FIELD_PICTURE))){

                         av_log(h->s.avctx, AV_LOG_ERROR, "illegal long ref in memory management control operation %d\n", opcode);

                         return -1;
                     }

                     h->mmco[i].long_arg= long_arg;

                 }

                 if(opcode > (unsigned)MMCO_LONG){

                     av_log(h->s.avctx, AV_LOG_ERROR, "illegal memory management control operation %d\n", opcode);

                     return -1;
                 }

                 if(opcode == MMCO_END)
                     break;

             }
             h->mmco_index= i;
         }else{
             assert(h->long_ref_count + h->short_ref_count <= h->sps.ref_frame_count);
 

             if(h->short_ref_count && h->long_ref_count + h->short_ref_count == h->sps.ref_frame_count &&

                     !(FIELD_PICTURE && !s->first_field && s->current_picture_ptr->reference)) {

                 h->mmco[0].opcode= MMCO_SHORT2UNUSED;

                 h->mmco[0].short_pic_num= h->short_ref[ h->short_ref_count - 1 ]->frame_num;

                 h->mmco_index= 1;

                 if (FIELD_PICTURE) {
                     h->mmco[0].short_pic_num *= 2;
                     h->mmco[1].opcode= MMCO_SHORT2UNUSED;
                     h->mmco[1].short_pic_num= h->mmco[0].short_pic_num + 1;
                     h->mmco_index= 2;
                 }

             }

         }
     }

 
     return 0;

 }
 
 static int init_poc(H264Context *h){
     MpegEncContext * const s = &h->s;
     const int max_frame_num= 1<<h->sps.log2_max_frame_num;
     int field_poc[2];

     Picture *cur = s->current_picture_ptr;

     h->frame_num_offset= h->prev_frame_num_offset;

     if(h->frame_num < h->prev_frame_num)

         h->frame_num_offset += max_frame_num;

 
     if(h->sps.poc_type==0){
         const int max_poc_lsb= 1<<h->sps.log2_max_poc_lsb;
 
         if     (h->poc_lsb < h->prev_poc_lsb && h->prev_poc_lsb - h->poc_lsb >= max_poc_lsb/2)
             h->poc_msb = h->prev_poc_msb + max_poc_lsb;
         else if(h->poc_lsb > h->prev_poc_lsb && h->prev_poc_lsb - h->poc_lsb < -max_poc_lsb/2)
             h->poc_msb = h->prev_poc_msb - max_poc_lsb;
         else
             h->poc_msb = h->prev_poc_msb;
 //printf("poc: %d %d\n", h->poc_msb, h->poc_lsb);

         field_poc[0] =

         field_poc[1] = h->poc_msb + h->poc_lsb;

         if(s->picture_structure == PICT_FRAME)

             field_poc[1] += h->delta_poc_bottom;
     }else if(h->sps.poc_type==1){
         int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
         int i;
 
         if(h->sps.poc_cycle_length != 0)
             abs_frame_num = h->frame_num_offset + h->frame_num;
         else
             abs_frame_num = 0;
 
         if(h->nal_ref_idc==0 && abs_frame_num > 0)
             abs_frame_num--;

         expected_delta_per_poc_cycle = 0;
         for(i=0; i < h->sps.poc_cycle_length; i++)
             expected_delta_per_poc_cycle += h->sps.offset_for_ref_frame[ i ]; //FIXME integrate during sps parse
 
         if(abs_frame_num > 0){
             int poc_cycle_cnt          = (abs_frame_num - 1) / h->sps.poc_cycle_length;
             int frame_num_in_poc_cycle = (abs_frame_num - 1) % h->sps.poc_cycle_length;
 
             expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
             for(i = 0; i <= frame_num_in_poc_cycle; i++)
                 expectedpoc = expectedpoc + h->sps.offset_for_ref_frame[ i ];
         } else
             expectedpoc = 0;
 

         if(h->nal_ref_idc == 0)

             expectedpoc = expectedpoc + h->sps.offset_for_non_ref_pic;

         field_poc[0] = expectedpoc + h->delta_poc[0];
         field_poc[1] = field_poc[0] + h->sps.offset_for_top_to_bottom_field;
 
         if(s->picture_structure == PICT_FRAME)
             field_poc[1] += h->delta_poc[1];
     }else{

         int poc= 2*(h->frame_num_offset + h->frame_num);

         if(!h->nal_ref_idc)
             poc--;

         field_poc[0]= poc;
         field_poc[1]= poc;
     }

     if(s->picture_structure != PICT_BOTTOM_FIELD)

         s->current_picture_ptr->field_poc[0]= field_poc[0];

     if(s->picture_structure != PICT_TOP_FIELD)

         s->current_picture_ptr->field_poc[1]= field_poc[1];

     cur->poc= FFMIN(cur->field_poc[0], cur->field_poc[1]);

 
     return 0;
 }
 

 
 /**
  * initialize scan tables
  */
 static void init_scan_tables(H264Context *h){
     MpegEncContext * const s = &h->s;
     int i;
     if(s->dsp.h264_idct_add == ff_h264_idct_add_c){ //FIXME little ugly
         memcpy(h->zigzag_scan, zigzag_scan, 16*sizeof(uint8_t));
         memcpy(h-> field_scan,  field_scan, 16*sizeof(uint8_t));
     }else{
         for(i=0; i<16; i++){
 #define T(x) (x>>2) | ((x<<2) & 0xF)
             h->zigzag_scan[i] = T(zigzag_scan[i]);
             h-> field_scan[i] = T( field_scan[i]);
 #undef T
         }
     }
     if(s->dsp.h264_idct8_add == ff_h264_idct8_add_c){

         memcpy(h->zigzag_scan8x8,       ff_zigzag_direct,     64*sizeof(uint8_t));

         memcpy(h->zigzag_scan8x8_cavlc, zigzag_scan8x8_cavlc, 64*sizeof(uint8_t));
         memcpy(h->field_scan8x8,        field_scan8x8,        64*sizeof(uint8_t));
         memcpy(h->field_scan8x8_cavlc,  field_scan8x8_cavlc,  64*sizeof(uint8_t));
     }else{
         for(i=0; i<64; i++){
 #define T(x) (x>>3) | ((x&7)<<3)

             h->zigzag_scan8x8[i]       = T(ff_zigzag_direct[i]);

             h->zigzag_scan8x8_cavlc[i] = T(zigzag_scan8x8_cavlc[i]);
             h->field_scan8x8[i]        = T(field_scan8x8[i]);
             h->field_scan8x8_cavlc[i]  = T(field_scan8x8_cavlc[i]);
 #undef T
         }
     }
     if(h->sps.transform_bypass){ //FIXME same ugly
         h->zigzag_scan_q0          = zigzag_scan;

         h->zigzag_scan8x8_q0       = ff_zigzag_direct;

         h->zigzag_scan8x8_cavlc_q0 = zigzag_scan8x8_cavlc;
         h->field_scan_q0           = field_scan;
         h->field_scan8x8_q0        = field_scan8x8;
         h->field_scan8x8_cavlc_q0  = field_scan8x8_cavlc;
     }else{
         h->zigzag_scan_q0          = h->zigzag_scan;
         h->zigzag_scan8x8_q0       = h->zigzag_scan8x8;
         h->zigzag_scan8x8_cavlc_q0 = h->zigzag_scan8x8_cavlc;
         h->field_scan_q0           = h->field_scan;
         h->field_scan8x8_q0        = h->field_scan8x8;
         h->field_scan8x8_cavlc_q0  = h->field_scan8x8_cavlc;
     }
 }

 
 /**
  * Replicates H264 "master" context to thread contexts.
  */
 static void clone_slice(H264Context *dst, H264Context *src)
 {
     memcpy(dst->block_offset,     src->block_offset, sizeof(dst->block_offset));
     dst->s.current_picture_ptr  = src->s.current_picture_ptr;
     dst->s.current_picture      = src->s.current_picture;
     dst->s.linesize             = src->s.linesize;
     dst->s.uvlinesize           = src->s.uvlinesize;

     dst->s.first_field          = src->s.first_field;

 
     dst->prev_poc_msb           = src->prev_poc_msb;
     dst->prev_poc_lsb           = src->prev_poc_lsb;
     dst->prev_frame_num_offset  = src->prev_frame_num_offset;
     dst->prev_frame_num         = src->prev_frame_num;
     dst->short_ref_count        = src->short_ref_count;
 
     memcpy(dst->short_ref,        src->short_ref,        sizeof(dst->short_ref));
     memcpy(dst->long_ref,         src->long_ref,         sizeof(dst->long_ref));
     memcpy(dst->default_ref_list, src->default_ref_list, sizeof(dst->default_ref_list));
     memcpy(dst->ref_list,         src->ref_list,         sizeof(dst->ref_list));

 
     memcpy(dst->dequant4_coeff,   src->dequant4_coeff,   sizeof(src->dequant4_coeff));
     memcpy(dst->dequant8_coeff,   src->dequant8_coeff,   sizeof(src->dequant8_coeff));

 }
 

 /**
  * decodes a slice header.