/*

  * H.26L/H.264/AVC/JVT/14496-10/... 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

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

 #include "libavutil/imgutils.h"

 #include "internal.h"

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

 #include "h264.h"

 #include "h264data.h"

 #include "h264_mvpred.h"

 #include "golomb.h"

 #include "mathops.h"

 #include "rectangle.h"

 #include "thread.h"

 #include "vdpau_internal.h"

 #include "libavutil/avassert.h"

 #include "cabac.h"
 

 //#undef NDEBUG

 #include <assert.h>
 

 static const uint8_t rem6[QP_MAX_NUM+1]={

 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, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3,

 };
 

 static const uint8_t div6[QP_MAX_NUM+1]={

 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, 8, 8, 9, 9, 9, 9, 9, 9,10,10,10,10,

 };
 

 static const enum PixelFormat hwaccel_pixfmt_list_h264_jpeg_420[] = {
     PIX_FMT_DXVA2_VLD,
     PIX_FMT_VAAPI_VLD,
     PIX_FMT_YUVJ420P,
     PIX_FMT_NONE
 };
 

 void ff_h264_write_back_intra_pred_mode(H264Context *h){

     int8_t *mode= h->intra4x4_pred_mode + h->mb2br_xy[h->mb_xy];

     AV_COPY32(mode, h->intra4x4_pred_mode_cache + 4 + 8*4);
     mode[4]= h->intra4x4_pred_mode_cache[7+8*3];
     mode[5]= h->intra4x4_pred_mode_cache[7+8*2];
     mode[6]= h->intra4x4_pred_mode_cache[7+8*1];

 }
 
 /**
  * checks if the top & left blocks are available if needed & changes the dc mode so it only uses the available blocks.
  */

 int ff_h264_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 check_intra_pred_mode

 static int check_intra_pred_mode(H264Context *h, int mode, int is_chroma){

     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(is_chroma && (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;
 }
 

 /**
  * checks if the top & left blocks are available if needed & changes the dc mode so it only uses the available blocks.
  */
 int ff_h264_check_intra16x16_pred_mode(H264Context *h, int mode)
 {
     return check_intra_pred_mode(h, mode, 0);
 }
 
 /**
  * checks if the top & left blocks are available if needed & changes the dc mode so it only uses the available blocks.
  */
 int ff_h264_check_intra_chroma_pred_mode(H264Context *h, int mode)
 {
     return check_intra_pred_mode(h, mode, 1);
 }
 
 

 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 HAVE_FAST_UNALIGNED
 # if HAVE_FAST_64BIT

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

         if(!((~AV_RN64A(src+i) & (AV_RN64A(src+i) - 0x0100010001000101ULL)) & 0x8000800080008080ULL))

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

         if(!((~AV_RN32A(src+i) & (AV_RN32A(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;

     }
 

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

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

     dst= h->rbsp_buffer[bufidx];

     if(si != h->rbsp_buffer_size[bufidx])
         memset(dst + length, 0, FF_INPUT_BUFFER_PADDING_SIZE+MAX_MBPAIR_SIZE);

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

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

         if(h->s.avctx->flags2 & CODEC_FLAG2_FAST){
             return src;
         }else{
             memcpy(dst, src, length);
             return dst;
         }

     }
 

 //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;
 }
 

 /**
  * Identify the exact end of the bitstream
  * @return the length of the trailing, or 0 if damaged
  */
 static 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;
 }
 

 static inline int get_lowest_part_list_y(H264Context *h, Picture *pic, int n, int height,
                                  int y_offset, int list){
     int raw_my= h->mv_cache[list][ scan8[n] ][1];
     int filter_height= (raw_my&3) ? 2 : 0;
     int full_my= (raw_my>>2) + y_offset;
     int top = full_my - filter_height, bottom = full_my + height + filter_height;
 
     return FFMAX(abs(top), bottom);
 }
 
 static inline void get_lowest_part_y(H264Context *h, int refs[2][48], int n, int height,
                                int y_offset, int list0, int list1, int *nrefs){
     MpegEncContext * const s = &h->s;
     int my;
 
     y_offset += 16*(s->mb_y >> MB_FIELD);
 
     if(list0){
         int ref_n = h->ref_cache[0][ scan8[n] ];
         Picture *ref= &h->ref_list[0][ref_n];
 
         // Error resilience puts the current picture in the ref list.
         // Don't try to wait on these as it will cause a deadlock.
         // Fields can wait on each other, though.
         if(ref->thread_opaque != s->current_picture.thread_opaque ||
            (ref->reference&3) != s->picture_structure) {
             my = get_lowest_part_list_y(h, ref, n, height, y_offset, 0);
             if (refs[0][ref_n] < 0) nrefs[0] += 1;
             refs[0][ref_n] = FFMAX(refs[0][ref_n], my);
         }
     }
 
     if(list1){
         int ref_n = h->ref_cache[1][ scan8[n] ];
         Picture *ref= &h->ref_list[1][ref_n];
 
         if(ref->thread_opaque != s->current_picture.thread_opaque ||
            (ref->reference&3) != s->picture_structure) {
             my = get_lowest_part_list_y(h, ref, n, height, y_offset, 1);
             if (refs[1][ref_n] < 0) nrefs[1] += 1;
             refs[1][ref_n] = FFMAX(refs[1][ref_n], my);
         }
     }
 }
 
 /**
  * Wait until all reference frames are available for MC operations.
  *
  * @param h the H264 context
  */
 static void await_references(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 refs[2][48];
     int nrefs[2] = {0};
     int ref, list;
 
     memset(refs, -1, sizeof(refs));
 
     if(IS_16X16(mb_type)){
         get_lowest_part_y(h, refs, 0, 16, 0,
                   IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1), nrefs);
     }else if(IS_16X8(mb_type)){
         get_lowest_part_y(h, refs, 0, 8, 0,
                   IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1), nrefs);
         get_lowest_part_y(h, refs, 8, 8, 8,
                   IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1), nrefs);
     }else if(IS_8X16(mb_type)){
         get_lowest_part_y(h, refs, 0, 16, 0,
                   IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1), nrefs);
         get_lowest_part_y(h, refs, 4, 16, 0,
                   IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1), nrefs);
     }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 y_offset= (i&2)<<2;
 
             if(IS_SUB_8X8(sub_mb_type)){
                 get_lowest_part_y(h, refs, n  , 8, y_offset,
                           IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1), nrefs);
             }else if(IS_SUB_8X4(sub_mb_type)){
                 get_lowest_part_y(h, refs, n  , 4, y_offset,
                           IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1), nrefs);
                 get_lowest_part_y(h, refs, n+2, 4, y_offset+4,
                           IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1), nrefs);
             }else if(IS_SUB_4X8(sub_mb_type)){
                 get_lowest_part_y(h, refs, n  , 8, y_offset,
                           IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1), nrefs);
                 get_lowest_part_y(h, refs, n+1, 8, y_offset,
                           IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1), nrefs);
             }else{
                 int j;
                 assert(IS_SUB_4X4(sub_mb_type));
                 for(j=0; j<4; j++){
                     int sub_y_offset= y_offset + 2*(j&2);
                     get_lowest_part_y(h, refs, n+j, 4, sub_y_offset,
                               IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1), nrefs);
                 }
             }
         }
     }
 
     for(list=h->list_count-1; list>=0; list--){
         for(ref=0; ref<48 && nrefs[list]; ref++){
             int row = refs[list][ref];
             if(row >= 0){
                 Picture *ref_pic = &h->ref_list[list][ref];
                 int ref_field = ref_pic->reference - 1;
                 int ref_field_picture = ref_pic->field_picture;
                 int pic_height = 16*s->mb_height >> ref_field_picture;
 
                 row <<= MB_MBAFF;
                 nrefs[list]--;
 
                 if(!FIELD_PICTURE && ref_field_picture){ // frame referencing two fields
                     ff_thread_await_progress((AVFrame*)ref_pic, FFMIN((row >> 1) - !(row&1), pic_height-1), 1);
                     ff_thread_await_progress((AVFrame*)ref_pic, FFMIN((row >> 1)           , pic_height-1), 0);
                 }else if(FIELD_PICTURE && !ref_field_picture){ // field referencing one field of a frame
                     ff_thread_await_progress((AVFrame*)ref_pic, FFMIN(row*2 + ref_field    , pic_height-1), 0);
                 }else if(FIELD_PICTURE){
                     ff_thread_await_progress((AVFrame*)ref_pic, FFMIN(row, pic_height-1), ref_field);
                 }else{
                     ff_thread_await_progress((AVFrame*)ref_pic, FFMIN(row, pic_height-1), 0);
                 }
             }
         }
     }
 }
 

 #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
 
 #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
 

 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,

                            int pixel_shift, int chroma444){

     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);

     int offset = ((mx>>2) << pixel_shift) + (my>>2)*h->mb_linesize;
     uint8_t * src_y = pic->data[0] + offset;

     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){

         s->dsp.emulated_edge_mc(s->edge_emu_buffer, src_y - (2 << pixel_shift) - 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 << pixel_shift) + 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(chroma444){
         src_cb = pic->data[1] + offset;
         if(emu){
             s->dsp.emulated_edge_mc(s->edge_emu_buffer, src_cb - (2 << pixel_shift) - 2*h->mb_linesize, h->mb_linesize,
                                     16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);
             src_cb= s->edge_emu_buffer + (2 << pixel_shift) + 2*h->mb_linesize;
         }
         qpix_op[luma_xy](dest_cb, src_cb, h->mb_linesize); //FIXME try variable height perhaps?
         if(!square){
             qpix_op[luma_xy](dest_cb + delta, src_cb + delta, h->mb_linesize);
         }
 
         src_cr = pic->data[2] + offset;
         if(emu){
             s->dsp.emulated_edge_mc(s->edge_emu_buffer, src_cr - (2 << pixel_shift) - 2*h->mb_linesize, h->mb_linesize,
                                     16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);
             src_cr= s->edge_emu_buffer + (2 << pixel_shift) + 2*h->mb_linesize;
         }
         qpix_op[luma_xy](dest_cr, src_cr, h->mb_linesize); //FIXME try variable height perhaps?
         if(!square){
             qpix_op[luma_xy](dest_cr + delta, src_cr + delta, h->mb_linesize);
         }
         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) << pixel_shift) + (my>>3)*h->mb_uvlinesize;
     src_cr= pic->data[2] + ((mx>>3) << pixel_shift) + (my>>3)*h->mb_uvlinesize;

 
     if(emu){
         s->dsp.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){
         s->dsp.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, int pixel_shift, int chroma444){

     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 << pixel_shift) + 2*y_offset*h->mb_linesize;
     if(chroma444){
         dest_cb += (2*x_offset << pixel_shift) + 2*y_offset*h->mb_linesize;
         dest_cr += (2*x_offset << pixel_shift) + 2*y_offset*h->mb_linesize;
     }else{
         dest_cb += (  x_offset << pixel_shift) +   y_offset*h->mb_uvlinesize;
         dest_cr += (  x_offset << pixel_shift) +   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, pixel_shift, chroma444);

 
         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, pixel_shift, chroma444);

     }
 }
 
 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, int pixel_shift, int chroma444){

     MpegEncContext * const s = &h->s;
 

     dest_y += (2*x_offset << pixel_shift) + 2*y_offset*h->mb_linesize;
     if(chroma444){
         chroma_weight_avg = luma_weight_avg;
         chroma_weight_op = luma_weight_op;
         dest_cb += (2*x_offset << pixel_shift) + 2*y_offset*h->mb_linesize;
         dest_cr += (2*x_offset << pixel_shift) + 2*y_offset*h->mb_linesize;
     }else{
         dest_cb += (  x_offset << pixel_shift) +   y_offset*h->mb_uvlinesize;
         dest_cr += (  x_offset << pixel_shift) +   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 + (16 << pixel_shift);
         uint8_t *tmp_y  = s->obmc_scratchpad + 16*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, pixel_shift, chroma444);

         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, pixel_shift, chroma444);

 
         if(h->use_weight == 2){
             int weight0 = h->implicit_weight[refn0][refn1][s->mb_y&1];
             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[refn0][0][0] , h->luma_weight[refn1][1][0],
                             h->luma_weight[refn0][0][1] + h->luma_weight[refn1][1][1]);
             chroma_weight_avg(dest_cb, tmp_cb, h->mb_uvlinesize, h->chroma_log2_weight_denom,
                             h->chroma_weight[refn0][0][0][0] , h->chroma_weight[refn1][1][0][0],
                             h->chroma_weight[refn0][0][0][1] + h->chroma_weight[refn1][1][0][1]);
             chroma_weight_avg(dest_cr, tmp_cr, h->mb_uvlinesize, h->chroma_log2_weight_denom,
                             h->chroma_weight[refn0][0][1][0] , h->chroma_weight[refn1][1][1][0],
                             h->chroma_weight[refn0][0][1][1] + h->chroma_weight[refn1][1][1][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, pixel_shift, chroma444);

 
         luma_weight_op(dest_y, h->mb_linesize, h->luma_log2_weight_denom,
                        h->luma_weight[refn][list][0], h->luma_weight[refn][list][1]);
         if(h->use_weight_chroma){
             chroma_weight_op(dest_cb, h->mb_uvlinesize, h->chroma_log2_weight_denom,
                              h->chroma_weight[refn][list][0][0], h->chroma_weight[refn][list][0][1]);
             chroma_weight_op(dest_cr, h->mb_uvlinesize, h->chroma_log2_weight_denom,
                              h->chroma_weight[refn][list][1][0], h->chroma_weight[refn][list][1][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, int pixel_shift, int chroma444){

     if((h->use_weight==2 && list0 && list1
         && (h->implicit_weight[ h->ref_cache[0][scan8[n]] ][ h->ref_cache[1][scan8[n]] ][h->s.mb_y&1] != 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, pixel_shift, chroma444);

     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, pixel_shift, chroma444);

 }
 

 static inline void prefetch_motion(H264Context *h, int list, int pixel_shift, int chroma444){

     /* 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+64)<<h->pixel_shift) + (my + (s->mb_x&3)*4)*h->mb_linesize;
         s->dsp.prefetch(src[0]+off, s->linesize, 4);

         if(chroma444){
             s->dsp.prefetch(src[1]+off, s->linesize, 4);
             s->dsp.prefetch(src[2]+off, s->linesize, 4);
         }else{

             off= (((mx>>1)+64)<<pixel_shift) + ((my>>1) + (s->mb_x&7))*s->uvlinesize;

             s->dsp.prefetch(src[1]+off, src[2]-src[1], 2);
         }

     }
 }
 

 static av_always_inline 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,

                       int pixel_shift, int chroma444){

     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));
 

     if(HAVE_PTHREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))

         await_references(h);

     prefetch_motion(h, 0, pixel_shift, chroma444);

 
     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, weight_avg,

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

                 pixel_shift, chroma444);

     }else if(IS_16X8(mb_type)){

         mc_part(h, 0, 0, 4, 8 << pixel_shift, 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),

                 pixel_shift, chroma444);

         mc_part(h, 8, 0, 4, 8 << pixel_shift, 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),

                 pixel_shift, chroma444);

     }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),

                 pixel_shift, chroma444);

         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),

                 pixel_shift, chroma444);

     }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),

                     pixel_shift, chroma444);

             }else if(IS_SUB_8X4(sub_mb_type)){

                 mc_part(h, n  , 0, 2, 4 << pixel_shift, 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),

                     pixel_shift, chroma444);

                 mc_part(h, n+2, 0, 2, 4 << pixel_shift, 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),

                     pixel_shift, chroma444);

             }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),

                     pixel_shift, chroma444);

                 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),

                     pixel_shift, chroma444);

             }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),

                         pixel_shift, chroma444);

                 }
             }
         }
     }
 

     prefetch_motion(h, 1, pixel_shift, chroma444);

 }
 

 #define hl_motion_fn(sh, bits) \
 static av_always_inline void hl_motion_ ## bits(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, \
                                        int chroma444) \

 { \
     hl_motion(h, dest_y, dest_cb, dest_cr, qpix_put, chroma_put, \

               qpix_avg, chroma_avg, weight_op, weight_avg, sh, chroma444); \

 }
 hl_motion_fn(0, 8);
 hl_motion_fn(1, 16);

 static void free_tables(H264Context *h, int free_rbsp){

     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->list_counts);

     av_freep(&h->mb2b_xy);

     av_freep(&h->mb2br_xy);

     for(i = 0; i < MAX_THREADS; 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);

         if (free_rbsp){

             av_freep(&hx->rbsp_buffer[1]);
             av_freep(&hx->rbsp_buffer[0]);
             hx->rbsp_buffer_size[0] = 0;
             hx->rbsp_buffer_size[1] = 0;

         }

         if (i) av_freep(&h->thread_context[i]);

     }

 }
 

 static void init_dequant8_coeff_table(H264Context *h){

     int i,j,q,x;

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

     for(i=0; i<6; i++ ){
         h->dequant8_coeff[i] = h->dequant8_buffer[i];
         for(j=0; j<i; j++){
             if(!memcmp(h->pps.scaling_matrix8[j], h->pps.scaling_matrix8[i], 64*sizeof(uint8_t))){
                 h->dequant8_coeff[i] = h->dequant8_buffer[j];
                 break;
             }

         }

         if(j<i)
             continue;

         for(q=0; q<max_qp+1; q++){

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

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

                 h->dequant8_coeff[i][q][(x>>3)|((x&7)<<3)] =

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

     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<max_qp+1; q++){

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

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

                 h->dequant4_coeff[i][q][(x>>2)|((x<<2)&0xF)] =

                     ((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<6; i++)

                 for(x=0; x<64; x++)
                     h->dequant8_coeff[i][0][x] = 1<<6;
     }
 }
 
 

 int ff_h264_alloc_tables(H264Context *h){

     MpegEncContext * const s = &h->s;

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

     const int row_mb_num= 2*s->mb_stride*s->avctx->thread_count;

     int x,y;

     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->intra4x4_pred_mode, row_mb_num * 8  * sizeof(uint8_t), fail)

     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->non_zero_count    , big_mb_num * 48 * sizeof(uint8_t), fail)

     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->slice_table_base  , (big_mb_num+s->mb_stride) * sizeof(*h->slice_table_base), fail)
     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->cbp_table, big_mb_num * sizeof(uint16_t), fail)

     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->chroma_pred_mode_table, big_mb_num * sizeof(uint8_t), fail)

     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->mvd_table[0], 16*row_mb_num * sizeof(uint8_t), fail);
     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->mvd_table[1], 16*row_mb_num * sizeof(uint8_t), fail);

     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->direct_table, 4*big_mb_num * sizeof(uint8_t) , fail);

     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->list_counts, big_mb_num * sizeof(uint8_t), fail)

     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;

     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->mb2b_xy  , big_mb_num * sizeof(uint32_t), fail);

     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->mb2br_xy , big_mb_num * sizeof(uint32_t), fail);

     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;

             h->mb2b_xy [mb_xy]= b_xy;

             h->mb2br_xy[mb_xy]= 8*(FMO ? mb_xy : (mb_xy % (2*s->mb_stride)));

         }
     }

     s->obmc_scratchpad = NULL;
 

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

     return 0;
 fail:

     free_tables(h, 1);

     return -1;
 }
 

 /**
  * Mimic alloc_tables(), but for every context thread.
  */

 static void clone_tables(H264Context *dst, H264Context *src, int i){
     MpegEncContext * const s = &src->s;
     dst->intra4x4_pred_mode       = src->intra4x4_pred_mode + i*8*2*s->mb_stride;

     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->mb2br_xy                 = src->mb2br_xy;

     dst->chroma_pred_mode_table   = src->chroma_pred_mode_table;

     dst->mvd_table[0]             = src->mvd_table[0] + i*8*2*s->mb_stride;
     dst->mvd_table[1]             = src->mvd_table[1] + i*8*2*s->mb_stride;

     dst->direct_table             = src->direct_table;

     dst->list_counts              = src->list_counts;

 
     dst->s.obmc_scratchpad = NULL;

     ff_h264_pred_init(&dst->hpc, src->s.codec_id, src->sps.bit_depth_luma);

 }
 
 /**
  * Init context
  * Allocate buffers which are not shared amongst multiple threads.
  */
 static int context_init(H264Context *h){

     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->top_borders[0], h->s.mb_width * 16*3 * sizeof(uint8_t)*2, fail)
     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->top_borders[1], h->s.mb_width * 16*3 * sizeof(uint8_t)*2, fail)

     h->ref_cache[0][scan8[5 ]+1] = h->ref_cache[0][scan8[7 ]+1] = h->ref_cache[0][scan8[13]+1] =
     h->ref_cache[1][scan8[5 ]+1] = h->ref_cache[1][scan8[7 ]+1] = h->ref_cache[1][scan8[13]+1] = PART_NOT_AVAILABLE;
 

     return 0;
 fail:
     return -1; // free_tables will clean up for us
 }
 

 static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size);
 

 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_h264dsp_init(&h->h264dsp, 8);
     ff_h264_pred_init(&h->hpc, s->codec_id, 8);

     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));

 }
 

 int ff_h264_decode_extradata(H264Context *h, const uint8_t *buf, int size)

 {
     AVCodecContext *avctx = h->s.avctx;

     if(!buf || size <= 0)
         return -1;
 

     if(buf[0] == 1){

         int i, cnt, nalsize;

         const unsigned char *p = buf;

 
         h->is_avc = 1;
 

         if(size < 7) {

             av_log(avctx, AV_LOG_ERROR, "avcC too short\n");
             return -1;
         }
         /* sps and pps in the avcC always have length coded with 2 bytes,
            so put a fake nal_length_size = 2 while parsing them */
         h->nal_length_size = 2;
         // Decode sps from avcC
         cnt = *(p+5) & 0x1f; // Number of sps
         p += 6;
         for (i = 0; i < cnt; i++) {
             nalsize = AV_RB16(p) + 2;

             if(nalsize > size - (p-buf))
                 return -1;

             if(decode_nal_units(h, p, nalsize) < 0) {
                 av_log(avctx, AV_LOG_ERROR, "Decoding sps %d from avcC failed\n", i);
                 return -1;
             }
             p += nalsize;
         }
         // Decode pps from avcC
         cnt = *(p++); // Number of pps
         for (i = 0; i < cnt; i++) {
             nalsize = AV_RB16(p) + 2;

             if(nalsize > size - (p-buf))
                 return -1;

             if (decode_nal_units(h, p, nalsize) < 0) {

                 av_log(avctx, AV_LOG_ERROR, "Decoding pps %d from avcC failed\n", i);
                 return -1;
             }
             p += nalsize;
         }
         // Now store right nal length size, that will be use to parse all other nals

         h->nal_length_size = (buf[4] & 0x03) + 1;

     } else {
         h->is_avc = 0;

         if(decode_nal_units(h, buf, size) < 0)

             return -1;
     }

     return 0;
 }
 
 av_cold int ff_h264_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;
 
     avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
 
     ff_h264_decode_init_vlc();
 

     h->pixel_shift = 0;

     h->sps.bit_depth_luma = avctx->bits_per_raw_sample = 8;

     h->thread_context[0] = h;

     h->outputed_poc = h->next_outputed_poc = INT_MIN;

     h->prev_poc_msb= 1<<16;
     h->x264_build = -1;
     ff_h264_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;
     }
 
     if(avctx->extradata_size > 0 && avctx->extradata &&

         ff_h264_decode_extradata(h, avctx->extradata, avctx->extradata_size))

         return -1;
 

     if(h->sps.bitstream_restriction_flag && s->avctx->has_b_frames < h->sps.num_reorder_frames){
         s->avctx->has_b_frames = h->sps.num_reorder_frames;
         s->low_delay = 0;
     }

     return 0;
 }
 

 #define IN_RANGE(a, b, size) (((a) >= (b)) && ((a) < ((b)+(size))))

 static void copy_picture_range(Picture **to, Picture **from, int count, MpegEncContext *new_base, MpegEncContext *old_base)
 {
     int i;
 
     for (i=0; i<count; i++){

         assert((IN_RANGE(from[i], old_base, sizeof(*old_base)) ||
                 IN_RANGE(from[i], old_base->picture, sizeof(Picture) * old_base->picture_count) ||
                 !from[i]));

         to[i] = REBASE_PICTURE(from[i], new_base, old_base);
     }
 }
 
 static void copy_parameter_set(void **to, void **from, int count, int size)
 {
     int i;
 
     for (i=0; i<count; i++){
         if (to[i] && !from[i]) av_freep(&to[i]);
         else if (from[i] && !to[i]) to[i] = av_malloc(size);
 
         if (from[i]) memcpy(to[i], from[i], size);
     }
 }
 
 static int decode_init_thread_copy(AVCodecContext *avctx){
     H264Context *h= avctx->priv_data;
 
     if (!avctx->is_copy) return 0;
     memset(h->sps_buffers, 0, sizeof(h->sps_buffers));
     memset(h->pps_buffers, 0, sizeof(h->pps_buffers));
 
     return 0;
 }
 
 #define copy_fields(to, from, start_field, end_field) memcpy(&to->start_field, &from->start_field, (char*)&to->end_field - (char*)&to->start_field)
 static int decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src){
     H264Context *h= dst->priv_data, *h1= src->priv_data;
     MpegEncContext * const s = &h->s, * const s1 = &h1->s;
     int inited = s->context_initialized, err;
     int i;
 
     if(dst == src || !s1->context_initialized) return 0;
 
     err = ff_mpeg_update_thread_context(dst, src);
     if(err) return err;
 
     //FIXME handle width/height changing
     if(!inited){
         for(i = 0; i < MAX_SPS_COUNT; i++)
             av_freep(h->sps_buffers + i);
 
         for(i = 0; i < MAX_PPS_COUNT; i++)
             av_freep(h->pps_buffers + i);
 
         memcpy(&h->s + 1, &h1->s + 1, sizeof(H264Context) - sizeof(MpegEncContext)); //copy all fields after MpegEnc
         memset(h->sps_buffers, 0, sizeof(h->sps_buffers));
         memset(h->pps_buffers, 0, sizeof(h->pps_buffers));

         if (ff_h264_alloc_tables(h) < 0) {
             av_log(dst, AV_LOG_ERROR, "Could not allocate memory for h264\n");
             return AVERROR(ENOMEM);
         }

         context_init(h);
 
         for(i=0; i<2; i++){
             h->rbsp_buffer[i] = NULL;
             h->rbsp_buffer_size[i] = 0;
         }
 
         h->thread_context[0] = h;
 
         // frame_start may not be called for the next thread (if it's decoding a bottom field)
         // so this has to be allocated here

         h->s.obmc_scratchpad = av_malloc(16*6*s->linesize);

 
         s->dsp.clear_blocks(h->mb);

         s->dsp.clear_blocks(h->mb+(24*16<<h->pixel_shift));

     }
 
     //extradata/NAL handling
     h->is_avc          = h1->is_avc;
 
     //SPS/PPS
     copy_parameter_set((void**)h->sps_buffers, (void**)h1->sps_buffers, MAX_SPS_COUNT, sizeof(SPS));
     h->sps             = h1->sps;
     copy_parameter_set((void**)h->pps_buffers, (void**)h1->pps_buffers, MAX_PPS_COUNT, sizeof(PPS));
     h->pps             = h1->pps;
 
     //Dequantization matrices
     //FIXME these are big - can they be only copied when PPS changes?
     copy_fields(h, h1, dequant4_buffer, dequant4_coeff);
 
     for(i=0; i<6; i++)
         h->dequant4_coeff[i] = h->dequant4_buffer[0] + (h1->dequant4_coeff[i] - h1->dequant4_buffer[0]);
 

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

         h->dequant8_coeff[i] = h->dequant8_buffer[0] + (h1->dequant8_coeff[i] - h1->dequant8_buffer[0]);
 
     h->dequant_coeff_pps = h1->dequant_coeff_pps;
 
     //POC timing
     copy_fields(h, h1, poc_lsb, redundant_pic_count);
 
     //reference lists

     copy_fields(h, h1, ref_count, list_count);
     copy_fields(h, h1, ref_list,  intra_gb);

     copy_fields(h, h1, short_ref, cabac_init_idc);
 
     copy_picture_range(h->short_ref,   h1->short_ref,   32, s, s1);

     copy_picture_range(h->long_ref,    h1->long_ref,    32, s, s1);

     copy_picture_range(h->delayed_pic, h1->delayed_pic, MAX_DELAYED_PIC_COUNT+2, s, s1);
 
     h->last_slice_type = h1->last_slice_type;
 
     if(!s->current_picture_ptr) return 0;
 
     if(!s->dropable) {
         ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index);
         h->prev_poc_msb     = h->poc_msb;
         h->prev_poc_lsb     = h->poc_lsb;
     }
     h->prev_frame_num_offset= h->frame_num_offset;
     h->prev_frame_num       = h->frame_num;
     h->outputed_poc         = h->next_outputed_poc;
 
     return 0;
 }
 

 int ff_h264_frame_start(H264Context *h){

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

     const int pixel_shift = h->pixel_shift;

     int thread_count = (s->avctx->active_thread_type & FF_THREAD_SLICE) ? s->avctx->thread_count : 1;

     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;

     s->current_picture_ptr->mmco_reset= 0;

 
     assert(s->linesize && s->uvlinesize);
 
     for(i=0; i<16; i++){

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

         h->block_offset[48+i]= (4*((scan8[i] - scan8[0])&7) << pixel_shift) + 8*s->linesize*((scan8[i] - scan8[0])>>3);

     }

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

         h->block_offset[16+i]=

         h->block_offset[32+i]= (4*((scan8[i] - scan8[0])&7) << pixel_shift) + 4*s->uvlinesize*((scan8[i] - scan8[0])>>3);
         h->block_offset[48+16+i]=
         h->block_offset[48+32+i]= (4*((scan8[i] - scan8[0])&7) << pixel_shift) + 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 < thread_count; i++)

         if(h->thread_context[i] && !h->thread_context[i]->s.obmc_scratchpad)

             h->thread_context[i]->s.obmc_scratchpad = av_malloc(16*6*s->linesize);

     /* some macroblocks can be accessed before they're available in case of lost slices, mbaff or threading*/

     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;

 
     h->next_output_pic = NULL;
 

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

     return 0;

 }
 

 /**
   * Run setup operations that must be run after slice header decoding.
   * This includes finding the next displayed frame.
   *
   * @param h h264 master context

   * @param setup_finished enough NALs have been read that we can call
   * ff_thread_finish_setup()

   */

 static void decode_postinit(H264Context *h, int setup_finished){

     MpegEncContext * const s = &h->s;
     Picture *out = s->current_picture_ptr;
     Picture *cur = s->current_picture_ptr;
     int i, pics, out_of_order, out_idx;
 
     s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_H264;
     s->current_picture_ptr->pict_type= s->pict_type;
 
     if (h->next_output_pic) return;
 
     if (cur->field_poc[0]==INT_MAX || cur->field_poc[1]==INT_MAX) {

         //FIXME: if we have two PAFF fields in one packet, we can't start the next thread here.
         //If we have one field per packet, we can. The check in decode_nal_units() is not good enough
         //to find this yet, so we assume the worst for now.
         //if (setup_finished)
         //    ff_thread_finish_setup(s->avctx);

         return;
     }
 
     cur->interlaced_frame = 0;
     cur->repeat_pict = 0;
 
     /* Signal interlacing information externally. */
     /* Prioritize picture timing SEI information over used decoding process if it exists. */
 
     if(h->sps.pic_struct_present_flag){
         switch (h->sei_pic_struct)
         {
         case SEI_PIC_STRUCT_FRAME:
             break;
         case SEI_PIC_STRUCT_TOP_FIELD:
         case SEI_PIC_STRUCT_BOTTOM_FIELD:
             cur->interlaced_frame = 1;
             break;
         case SEI_PIC_STRUCT_TOP_BOTTOM:
         case SEI_PIC_STRUCT_BOTTOM_TOP:
             if (FIELD_OR_MBAFF_PICTURE)
                 cur->interlaced_frame = 1;
             else
                 // try to flag soft telecine progressive
                 cur->interlaced_frame = h->prev_interlaced_frame;
             break;
         case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
         case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
             // Signal the possibility of telecined film externally (pic_struct 5,6)
             // From these hints, let the applications decide if they apply deinterlacing.
             cur->repeat_pict = 1;
             break;
         case SEI_PIC_STRUCT_FRAME_DOUBLING:
             // Force progressive here, as doubling interlaced frame is a bad idea.
             cur->repeat_pict = 2;
             break;
         case SEI_PIC_STRUCT_FRAME_TRIPLING:
             cur->repeat_pict = 4;
             break;
         }
 
         if ((h->sei_ct_type & 3) && h->sei_pic_struct <= SEI_PIC_STRUCT_BOTTOM_TOP)
             cur->interlaced_frame = (h->sei_ct_type & (1<<1)) != 0;
     }else{
         /* Derive interlacing flag from used decoding process. */
         cur->interlaced_frame = FIELD_OR_MBAFF_PICTURE;
     }
     h->prev_interlaced_frame = cur->interlaced_frame;
 
     if (cur->field_poc[0] != cur->field_poc[1]){
         /* Derive top_field_first from field pocs. */
         cur->top_field_first = cur->field_poc[0] < cur->field_poc[1];
     }else{
         if(cur->interlaced_frame || h->sps.pic_struct_present_flag){
             /* Use picture timing SEI information. Even if it is a information of a past frame, better than nothing. */
             if(h->sei_pic_struct == SEI_PIC_STRUCT_TOP_BOTTOM
               || h->sei_pic_struct == SEI_PIC_STRUCT_TOP_BOTTOM_TOP)
                 cur->top_field_first = 1;
             else
                 cur->top_field_first = 0;
         }else{
             /* Most likely progressive */
             cur->top_field_first = 0;
         }
     }
 
     //FIXME do something with unavailable reference frames
 
     /* Sort B-frames into display order */
 
     if(h->sps.bitstream_restriction_flag
        && s->avctx->has_b_frames < h->sps.num_reorder_frames){
         s->avctx->has_b_frames = h->sps.num_reorder_frames;
         s->low_delay = 0;
     }
 
     if(   s->avctx->strict_std_compliance >= FF_COMPLIANCE_STRICT
        && !h->sps.bitstream_restriction_flag){
         s->avctx->has_b_frames= MAX_DELAYED_PIC_COUNT;
         s->low_delay= 0;
     }
 
     pics = 0;
     while(h->delayed_pic[pics]) pics++;
 

     av_assert0(pics <= MAX_DELAYED_PIC_COUNT);

 
     h->delayed_pic[pics++] = cur;
     if(cur->reference == 0)
         cur->reference = DELAYED_PIC_REF;
 
     out = h->delayed_pic[0];
     out_idx = 0;
     for(i=1; h->delayed_pic[i] && !h->delayed_pic[i]->key_frame && !h->delayed_pic[i]->mmco_reset; i++)
         if(h->delayed_pic[i]->poc < out->poc){
             out = h->delayed_pic[i];
             out_idx = i;
         }
     if(s->avctx->has_b_frames == 0 && (h->delayed_pic[0]->key_frame || h->delayed_pic[0]->mmco_reset))
         h->next_outputed_poc= INT_MIN;
     out_of_order = out->poc < h->next_outputed_poc;
 
     if(h->sps.bitstream_restriction_flag && s->avctx->has_b_frames >= h->sps.num_reorder_frames)
         { }
     else if((out_of_order && pics-1 == s->avctx->has_b_frames && s->avctx->has_b_frames < MAX_DELAYED_PIC_COUNT)
        || (s->low_delay &&
         ((h->next_outputed_poc != INT_MIN && out->poc > h->next_outputed_poc + 2)

          || cur->pict_type == AV_PICTURE_TYPE_B)))

     {
         s->low_delay = 0;
         s->avctx->has_b_frames++;
     }
 
     if(out_of_order || pics > s->avctx->has_b_frames){
         out->reference &= ~DELAYED_PIC_REF;

         out->owner2 = s; // for frame threading, the owner must be the second field's thread
                          // or else the first thread can release the picture and reuse it unsafely

         for(i=out_idx; h->delayed_pic[i]; i++)
             h->delayed_pic[i] = h->delayed_pic[i+1];
     }
     if(!out_of_order && pics > s->avctx->has_b_frames){
         h->next_output_pic = out;
         if(out_idx==0 && h->delayed_pic[0] && (h->delayed_pic[0]->key_frame || h->delayed_pic[0]->mmco_reset)) {
             h->next_outputed_poc = INT_MIN;
         } else
             h->next_outputed_poc = out->poc;
     }else{
         av_log(s->avctx, AV_LOG_DEBUG, "no picture\n");
     }
 

     if (setup_finished)
         ff_thread_finish_setup(s->avctx);

 }
 

 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 chroma444, int simple){

     MpegEncContext * const s = &h->s;

     uint8_t *top_border;

     int top_idx = 1;

     const int pixel_shift = h->pixel_shift;

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

     if(!simple && FRAME_MBAFF){
         if(s->mb_y&1){
             if(!MB_MBAFF){

                 top_border = h->top_borders[0][s->mb_x];
                 AV_COPY128(top_border, src_y + 15*linesize);

                 if (pixel_shift)

                     AV_COPY128(top_border+16, src_y+15*linesize+16);

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

                     if(chroma444){
                         if (pixel_shift){
                             AV_COPY128(top_border+32, src_cb + 15*uvlinesize);
                             AV_COPY128(top_border+48, src_cb + 15*uvlinesize+16);
                             AV_COPY128(top_border+64, src_cr + 15*uvlinesize);
                             AV_COPY128(top_border+80, src_cr + 15*uvlinesize+16);
                         } else {
                             AV_COPY128(top_border+16, src_cb + 15*uvlinesize);
                             AV_COPY128(top_border+32, src_cr + 15*uvlinesize);
                         }

                     } else {

                         if (pixel_shift) {
                             AV_COPY128(top_border+32, src_cb+7*uvlinesize);
                             AV_COPY128(top_border+48, src_cr+7*uvlinesize);
                         } else {
                             AV_COPY64(top_border+16, src_cb+7*uvlinesize);
                             AV_COPY64(top_border+24, src_cr+7*uvlinesize);
                         }

                     }

                 }
             }

         }else if(MB_MBAFF){
             top_idx = 0;
         }else
             return;

     }
 

     top_border = h->top_borders[top_idx][s->mb_x];

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

     // and the line above the bottom macroblock

     AV_COPY128(top_border, src_y + 16*linesize);

     if (pixel_shift)

         AV_COPY128(top_border+16, src_y+16*linesize+16);

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

         if(chroma444){
             if (pixel_shift){
                 AV_COPY128(top_border+32, src_cb + 16*linesize);
                 AV_COPY128(top_border+48, src_cb + 16*linesize+16);
                 AV_COPY128(top_border+64, src_cr + 16*linesize);
                 AV_COPY128(top_border+80, src_cr + 16*linesize+16);
             } else {
                 AV_COPY128(top_border+16, src_cb + 16*linesize);
                 AV_COPY128(top_border+32, src_cr + 16*linesize);
             }

         } else {

             if (pixel_shift) {
                 AV_COPY128(top_border+32, src_cb+8*uvlinesize);
                 AV_COPY128(top_border+48, src_cr+8*uvlinesize);
             } else {
                 AV_COPY64(top_border+16, src_cb+8*uvlinesize);
                 AV_COPY64(top_border+24, 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 chroma444,
                                   int simple, int pixel_shift){

     MpegEncContext * const s = &h->s;

     int deblock_topleft;

     int deblock_top;

     int top_idx = 1;

     uint8_t *top_border_m1;
     uint8_t *top_border;

 
     if(!simple && FRAME_MBAFF){
         if(s->mb_y&1){

             if(!MB_MBAFF)
                 return;

         }else{
             top_idx = MB_MBAFF ? 0 : 1;
         }
     }

 
     if(h->deblocking_filter == 2) {

         deblock_topleft = h->slice_table[h->mb_xy - 1 - s->mb_stride] == h->slice_num;
         deblock_top     = h->top_type;

     } else {

         deblock_topleft = (s->mb_x > 0);
         deblock_top     = (s->mb_y > !!MB_FIELD);

     }

     src_y  -=   linesize + 1 + pixel_shift;
     src_cb -= uvlinesize + 1 + pixel_shift;
     src_cr -= uvlinesize + 1 + pixel_shift;

     top_border_m1 = h->top_borders[top_idx][s->mb_x-1];
     top_border    = h->top_borders[top_idx][s->mb_x];
 

 #define XCHG(a,b,xchg)\

     if (pixel_shift) {\

         if (xchg) {\
             AV_SWAP64(b+0,a+0);\
             AV_SWAP64(b+8,a+8);\
         } else {\
             AV_COPY128(b,a); \
         }\
     } else \

 if (xchg) AV_SWAP64(b,a);\
 else      AV_COPY64(b,a);

 
     if(deblock_top){

         if(deblock_topleft){

             XCHG(top_border_m1 + (8 << pixel_shift), src_y - (7 << pixel_shift), 1);

         }

         XCHG(top_border + (0 << pixel_shift), src_y + (1 << pixel_shift), xchg);
         XCHG(top_border + (8 << pixel_shift), src_y + (9 << pixel_shift), 1);

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

             XCHG(h->top_borders[top_idx][s->mb_x+1], src_y + (17 << pixel_shift), 1);

         }

     }

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

         if(chroma444){

             if(deblock_topleft){

                 XCHG(top_border_m1 + (24 << pixel_shift), src_cb - (7 << pixel_shift), 1);
                 XCHG(top_border_m1 + (40 << pixel_shift), src_cr - (7 << pixel_shift), 1);
             }
             XCHG(top_border + (16 << pixel_shift), src_cb + (1 << pixel_shift), xchg);
             XCHG(top_border + (24 << pixel_shift), src_cb + (9 << pixel_shift), 1);
             XCHG(top_border + (32 << pixel_shift), src_cr + (1 << pixel_shift), xchg);
             XCHG(top_border + (40 << pixel_shift), src_cr + (9 << pixel_shift), 1);
             if(s->mb_x+1 < s->mb_width){
                 XCHG(h->top_borders[top_idx][s->mb_x+1] + (16 << pixel_shift), src_cb + (17 << pixel_shift), 1);
                 XCHG(h->top_borders[top_idx][s->mb_x+1] + (32 << pixel_shift), src_cr + (17 << pixel_shift), 1);
             }
         } else {
             if(deblock_top){
                 if(deblock_topleft){
                     XCHG(top_border_m1 + (16 << pixel_shift), src_cb - (7 << pixel_shift), 1);
                     XCHG(top_border_m1 + (24 << pixel_shift), src_cr - (7 << pixel_shift), 1);
                 }
                 XCHG(top_border + (16 << pixel_shift), src_cb+1+pixel_shift, 1);
                 XCHG(top_border + (24 << pixel_shift), src_cr+1+pixel_shift, 1);

             }

         }
     }
 }
 

 static av_always_inline int dctcoef_get(DCTELEM *mb, int high_bit_depth, int index) {
     if (high_bit_depth) {
         return AV_RN32A(((int32_t*)mb) + index);
     } else
         return AV_RN16A(mb + index);

 }
 

 static av_always_inline void dctcoef_set(DCTELEM *mb, int high_bit_depth, int index, int value) {
     if (high_bit_depth) {
         AV_WN32A(((int32_t*)mb) + index, value);
     } else
         AV_WN16A(mb + index, value);

 }
 

 static av_always_inline void hl_decode_mb_predict_luma(H264Context *h, int mb_type, int is_h264, int simple, int transform_bypass,
                                                        int pixel_shift, int *block_offset, int linesize, uint8_t *dest_y, int p)
 {
     MpegEncContext * const s = &h->s;
     void (*idct_add)(uint8_t *dst, DCTELEM *block, int stride);
     void (*idct_dc_add)(uint8_t *dst, DCTELEM *block, int stride);
     int i;
     int qscale = p == 0 ? s->qscale : h->chroma_qp[p-1];
     block_offset += 16*p;
     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 = h->h264dsp.h264_idct8_dc_add;
                     idct_add    = h->h264dsp.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+p*256 << pixel_shift), linesize);
                     }else{
                         const int nnz = h->non_zero_count_cache[ scan8[i+p*16] ];
                         h->hpc.pred8x8l[ dir ](ptr, (h->topleft_samples_available<<i)&0x8000,
                                                     (h->topright_samples_available<<i)&0x4000, linesize);
                         if(nnz){
                             if(nnz == 1 && dctcoef_get(h->mb, pixel_shift, i*16+p*256))
                                 idct_dc_add(ptr, h->mb + (i*16+p*256 << pixel_shift), linesize);
                             else
                                 idct_add   (ptr, h->mb + (i*16+p*256 << pixel_shift), linesize);
                         }
                     }
                 }
             }else{
                 if(transform_bypass){
                     idct_dc_add =
                     idct_add    = s->dsp.add_pixels4;
                 }else{
                     idct_dc_add = h->h264dsp.h264_idct_dc_add;
                     idct_add    = h->h264dsp.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+p*256 << pixel_shift), linesize);
                     }else{
                         uint8_t *topright;
                         int nnz, tr;
                         uint64_t tr_high;
                         if(dir == DIAG_DOWN_LEFT_PRED || dir == VERT_LEFT_PRED){
                             const int topright_avail= (h->topright_samples_available<<i)&0x8000;

                             assert(s->mb_y || linesize <= block_offset[i]);

                             if(!topright_avail){
                                 if (pixel_shift) {
                                     tr_high= ((uint16_t*)ptr)[3 - linesize/2]*0x0001000100010001ULL;
                                     topright= (uint8_t*) &tr_high;
                                 } else {
                                     tr= ptr[3 - linesize]*0x01010101;
                                     topright= (uint8_t*) &tr;
                                 }
                             }else
                                 topright= ptr + (4 << pixel_shift) - linesize;
                         }else
                             topright= NULL;
 
                         h->hpc.pred4x4[ dir ](ptr, topright, linesize);
                         nnz = h->non_zero_count_cache[ scan8[i+p*16] ];
                         if(nnz){
                             if(is_h264){
                                 if(nnz == 1 && dctcoef_get(h->mb, pixel_shift, i*16+p*256))
                                     idct_dc_add(ptr, h->mb + (i*16+p*256 << pixel_shift), linesize);
                                 else
                                     idct_add   (ptr, h->mb + (i*16+p*256 << pixel_shift), linesize);
                             }else
                                 ff_svq3_add_idct_c(ptr, h->mb + i*16+p*256, linesize, qscale, 0);
                         }
                     }
                 }
             }
         }
     }else{
         h->hpc.pred16x16[ h->intra16x16_pred_mode ](dest_y , linesize);
         if(is_h264){
             if(h->non_zero_count_cache[ scan8[LUMA_DC_BLOCK_INDEX+p] ]){
                 if(!transform_bypass)
                     h->h264dsp.h264_luma_dc_dequant_idct(h->mb+(p*256 << pixel_shift), h->mb_luma_dc[p], h->dequant4_coeff[p][qscale][0]);
                 else{
                     static const uint8_t dc_mapping[16] = { 0*16, 1*16, 4*16, 5*16, 2*16, 3*16, 6*16, 7*16,
                                                             8*16, 9*16,12*16,13*16,10*16,11*16,14*16,15*16};
                     for(i = 0; i < 16; i++)
                         dctcoef_set(h->mb+p*256, pixel_shift, dc_mapping[i], dctcoef_get(h->mb_luma_dc[p], pixel_shift, i));
                 }
             }
         }else
             ff_svq3_luma_dc_dequant_idct_c(h->mb+p*256, h->mb_luma_dc[p], qscale);
     }
 }
 
 static av_always_inline void hl_decode_mb_idct_luma(H264Context *h, int mb_type, int is_h264, int simple, int transform_bypass,
                                                     int pixel_shift, int *block_offset, int linesize, uint8_t *dest_y, int p)
 {
     MpegEncContext * const s = &h->s;
     void (*idct_add)(uint8_t *dst, DCTELEM *block, int stride);
     int i;
     block_offset += 16*p;
     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 + (p*256 << pixel_shift), linesize);
                     }else{
                         for(i=0; i<16; i++){

                             if(h->non_zero_count_cache[ scan8[i+p*16] ] || dctcoef_get(h->mb, pixel_shift, i*16+p*256))

                                 s->dsp.add_pixels4(dest_y + block_offset[i], h->mb + (i*16+p*256 << pixel_shift), linesize);
                         }
                     }
                 }else{
                     h->h264dsp.h264_idct_add16intra(dest_y, block_offset, h->mb + (p*256 << pixel_shift), linesize, h->non_zero_count_cache+p*5*8);
                 }
             }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+p*16] ]){
                             idct_add(dest_y + block_offset[i], h->mb + (i*16+p*256 << pixel_shift), linesize);
                         }
                     }
                 }else{
                     if(IS_8x8DCT(mb_type)){
                         h->h264dsp.h264_idct8_add4(dest_y, block_offset, h->mb + (p*256 << pixel_shift), linesize, h->non_zero_count_cache+p*5*8);
                     }else{
                         h->h264dsp.h264_idct_add16(dest_y, block_offset, h->mb + (p*256 << pixel_shift), linesize, h->non_zero_count_cache+p*5*8);
                     }
                 }
             }
         }else{
             for(i=0; i<16; i++){
                 if(h->non_zero_count_cache[ scan8[i+p*16] ] || h->mb[i*16+p*256]){ //FIXME benchmark weird rule, & below
                     uint8_t * const ptr= dest_y + block_offset[i];
                     ff_svq3_add_idct_c(ptr, h->mb + i*16 + p*256, linesize, s->qscale, IS_INTRA(mb_type) ? 1 : 0);
                 }
             }
         }
     }
 }
 

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

     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, j;

     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);

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

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

     h->list_counts[mb_xy]= h->list_count;
 

     if (!simple && MB_FIELD) {

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

         block_offset = &h->block_offset[48];

         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)) {

         if (pixel_shift) {

             const int bit_depth = h->sps.bit_depth_luma;
             int j;
             GetBitContext gb;
             init_get_bits(&gb, (uint8_t*)h->mb, 384*bit_depth);
 
             for (i = 0; i < 16; i++) {
                 uint16_t *tmp_y  = (uint16_t*)(dest_y  + i*linesize);
                 for (j = 0; j < 16; j++)
                     tmp_y[j] = get_bits(&gb, bit_depth);
             }

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

                 if (!h->sps.chroma_format_idc) {
                     for (i = 0; i < 8; i++) {
                         uint16_t *tmp_cb = (uint16_t*)(dest_cb + i*uvlinesize);
                         for (j = 0; j < 8; j++) {
                             tmp_cb[j] = 1 << (bit_depth - 1);
                         }
                     }
                     for (i = 0; i < 8; i++) {
                         uint16_t *tmp_cr = (uint16_t*)(dest_cr + i*uvlinesize);
                         for (j = 0; j < 8; j++) {
                             tmp_cr[j] = 1 << (bit_depth - 1);
                         }
                     }
                 } else {
                     for (i = 0; i < 8; i++) {
                         uint16_t *tmp_cb = (uint16_t*)(dest_cb + i*uvlinesize);
                         for (j = 0; j < 8; j++)
                             tmp_cb[j] = get_bits(&gb, bit_depth);
                     }
                     for (i = 0; i < 8; i++) {
                         uint16_t *tmp_cr = (uint16_t*)(dest_cr + i*uvlinesize);
                         for (j = 0; j < 8; j++)
                             tmp_cr[j] = get_bits(&gb, bit_depth);
                     }

                 }

             }
         } else {

             for (i=0; i<16; i++) {
                 memcpy(dest_y + i*  linesize, h->mb       + i*8, 16);
             }
             if(simple || !CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

                 if (!h->sps.chroma_format_idc) {
                     for (i = 0; i < 8; i++) {
                         memset(dest_cb + i*uvlinesize, 128, 8);
                         memset(dest_cr + i*uvlinesize, 128, 8);
                     }
                 } else {
                     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, 0, simple, pixel_shift);

             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);

             }

             hl_decode_mb_predict_luma(h, mb_type, is_h264, simple, transform_bypass, pixel_shift, block_offset, linesize, dest_y, 0);
 

             if(h->deblocking_filter)

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

         }else if(is_h264){

             if (pixel_shift) {
                 hl_motion_16(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,
                              h->h264dsp.weight_h264_pixels_tab,

                              h->h264dsp.biweight_h264_pixels_tab, 0);

             } else
                 hl_motion_8(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,
                             h->h264dsp.weight_h264_pixels_tab,

                             h->h264dsp.biweight_h264_pixels_tab, 0);

         }

         hl_decode_mb_idct_luma(h, mb_type, is_h264, simple, transform_bypass, pixel_shift, block_offset, linesize, dest_y, 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*1 << pixel_shift), uvlinesize);
                     h->hpc.pred8x8_add[h->chroma_pred_mode](dest[1], block_offset + 32, h->mb + (16*16*2 << pixel_shift), uvlinesize);

                 }else{

                     idct_add = s->dsp.add_pixels4;

                     for(j=1; j<3; j++){
                         for(i=j*16; i<j*16+4; i++){
                             if(h->non_zero_count_cache[ scan8[i] ] || dctcoef_get(h->mb, pixel_shift, i*16))
                                 idct_add   (dest[j-1] + block_offset[i], h->mb + (i*16 << pixel_shift), uvlinesize);
                         }

                     }
                 }

             }else{

                 if(is_h264){

                     if(h->non_zero_count_cache[ scan8[CHROMA_DC_BLOCK_INDEX+0] ])

                         h->h264dsp.h264_chroma_dc_dequant_idct(h->mb + (16*16*1 << pixel_shift), h->dequant4_coeff[IS_INTRA(mb_type) ? 1:4][h->chroma_qp[0]][0]);

                     if(h->non_zero_count_cache[ scan8[CHROMA_DC_BLOCK_INDEX+1] ])

                         h->h264dsp.h264_chroma_dc_dequant_idct(h->mb + (16*16*2 << pixel_shift), h->dequant4_coeff[IS_INTRA(mb_type) ? 2:5][h->chroma_qp[1]][0]);

                     h->h264dsp.h264_idct_add8(dest, block_offset,
                                               h->mb, uvlinesize,
                                               h->non_zero_count_cache);

                 }
 #if CONFIG_SVQ3_DECODER
                 else{

                     h->h264dsp.h264_chroma_dc_dequant_idct(h->mb + 16*16*1, h->dequant4_coeff[IS_INTRA(mb_type) ? 1:4][h->chroma_qp[0]][0]);
                     h->h264dsp.h264_chroma_dc_dequant_idct(h->mb + 16*16*2, h->dequant4_coeff[IS_INTRA(mb_type) ? 2:5][h->chroma_qp[1]][0]);
                     for(j=1; j<3; j++){
                         for(i=j*16; i<j*16+4; i++){
                             if(h->non_zero_count_cache[ scan8[i] ] || h->mb[i*16]){
                                 uint8_t * const ptr= dest[j-1] + block_offset[i];
                                 ff_svq3_add_idct_c(ptr, h->mb + i*16, uvlinesize, ff_h264_chroma_qp[0][s->qscale + 12] - 12, 2);
                             }

                         }

                     }

                 }

 #endif

             }
         }
     }

     if(h->cbp || IS_INTRA(mb_type))

     {

         s->dsp.clear_blocks(h->mb);

         s->dsp.clear_blocks(h->mb+(24*16<<pixel_shift));
     }
 }
 
 static av_always_inline void hl_decode_mb_444_internal(H264Context *h, int simple, int pixel_shift){
     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[3];
     int linesize;
     int i, j, p;
     int *block_offset = &h->block_offset[0];
     const int transform_bypass = !simple && (s->qscale == 0 && h->sps.transform_bypass);

     const int plane_count = (simple || !CONFIG_GRAY || !(s->flags&CODEC_FLAG_GRAY)) ? 3 : 1;

     for (p = 0; p < plane_count; p++)

     {
         dest[p] = s->current_picture.data[p] + ((mb_x << pixel_shift) + mb_y * s->linesize) * 16;
         s->dsp.prefetch(dest[p] + (s->mb_x&3)*4*s->linesize + (64 << pixel_shift), s->linesize, 4);
     }
 
     h->list_counts[mb_xy]= h->list_count;
 
     if (!simple && MB_FIELD) {
         linesize   = h->mb_linesize = h->mb_uvlinesize = s->linesize * 2;
         block_offset = &h->block_offset[48];
         if(mb_y&1) //FIXME move out of this function?
             for (p = 0; p < 3; p++)
                 dest[p] -= s->linesize*15;
         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 = h->mb_uvlinesize = s->linesize;
     }
 
     if (!simple && IS_INTRA_PCM(mb_type)) {
         if (pixel_shift) {
             const int bit_depth = h->sps.bit_depth_luma;
             GetBitContext gb;
             init_get_bits(&gb, (uint8_t*)h->mb, 768*bit_depth);
 

             for (p = 0; p < plane_count; p++) {

                 for (i = 0; i < 16; i++) {
                     uint16_t *tmp = (uint16_t*)(dest[p] + i*linesize);
                     for (j = 0; j < 16; j++)
                         tmp[j] = get_bits(&gb, bit_depth);
                 }
             }
         } else {

             for (p = 0; p < plane_count; p++) {

                 for (i = 0; i < 16; i++) {
                     memcpy(dest[p] + i*linesize, h->mb + p*128 + i*8, 16);
                 }
             }
         }
     } else {
         if(IS_INTRA(mb_type)){
             if(h->deblocking_filter)
                 xchg_mb_border(h, dest[0], dest[1], dest[2], linesize, linesize, 1, 1, simple, pixel_shift);
 

             for (p = 0; p < plane_count; p++)

                 hl_decode_mb_predict_luma(h, mb_type, 1, simple, transform_bypass, pixel_shift, block_offset, linesize, dest[p], p);
 
             if(h->deblocking_filter)
                 xchg_mb_border(h, dest[0], dest[1], dest[2], linesize, linesize, 0, 1, simple, pixel_shift);
         }else{
             if (pixel_shift) {
                 hl_motion_16(h, dest[0], dest[1], dest[2],
                              s->me.qpel_put, s->dsp.put_h264_chroma_pixels_tab,
                              s->me.qpel_avg, s->dsp.avg_h264_chroma_pixels_tab,
                              h->h264dsp.weight_h264_pixels_tab,
                              h->h264dsp.biweight_h264_pixels_tab, 1);
             } else
                 hl_motion_8(h, dest[0], dest[1], dest[2],
                             s->me.qpel_put, s->dsp.put_h264_chroma_pixels_tab,
                             s->me.qpel_avg, s->dsp.avg_h264_chroma_pixels_tab,
                             h->h264dsp.weight_h264_pixels_tab,
                             h->h264dsp.biweight_h264_pixels_tab, 1);
         }
 

         for (p = 0; p < plane_count; p++)

             hl_decode_mb_idct_luma(h, mb_type, 1, simple, transform_bypass, pixel_shift, block_offset, linesize, dest[p], p);
     }
     if(h->cbp || IS_INTRA(mb_type))
     {

         s->dsp.clear_blocks(h->mb);

         s->dsp.clear_blocks(h->mb+(24*16<<pixel_shift));
     }

 }
 
 /**

  * Process a macroblock; this case avoids checks for expensive uncommon cases.
  */

 #define hl_decode_mb_simple(sh, bits) \
 static void hl_decode_mb_simple_ ## bits(H264Context *h){ \
     hl_decode_mb_internal(h, 1, sh); \

 }

 hl_decode_mb_simple(0, 8);
 hl_decode_mb_simple(1, 16);

 
 /**
  * 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, h->pixel_shift);

 }
 

 static void av_noinline hl_decode_mb_444_complex(H264Context *h){
     hl_decode_mb_444_internal(h, 0, h->pixel_shift);
 }
 
 static void av_noinline hl_decode_mb_444_simple(H264Context *h){
     hl_decode_mb_444_internal(h, 1, 0);
 }
 

 void ff_h264_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 (CHROMA444) {
         if(is_complex || h->pixel_shift)
             hl_decode_mb_444_complex(h);
         else
             hl_decode_mb_444_simple(h);
     } else if (is_complex) {

         hl_decode_mb_complex(h);

     } else if (h->pixel_shift) {
         hl_decode_mb_simple_16(h);
     } else
         hl_decode_mb_simple_8(h);

 }
 

 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);

     if(h->sps.chroma_format_idc)

         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[i][list][0]= get_se_golomb(&s->gb);
                 h->luma_weight[i][list][1]= get_se_golomb(&s->gb);
                 if(   h->luma_weight[i][list][0] != luma_def
                    || h->luma_weight[i][list][1] != 0) {

                     h->use_weight= 1;

                     h->luma_weight_flag[list]= 1;
                 }

             }else{

                 h->luma_weight[i][list][0]= luma_def;
                 h->luma_weight[i][list][1]= 0;

             }
 

             if(h->sps.chroma_format_idc){

                 chroma_weight_flag= get_bits1(&s->gb);
                 if(chroma_weight_flag){
                     int j;
                     for(j=0; j<2; j++){

                         h->chroma_weight[i][list][j][0]= get_se_golomb(&s->gb);
                         h->chroma_weight[i][list][j][1]= get_se_golomb(&s->gb);
                         if(   h->chroma_weight[i][list][j][0] != chroma_def
                            || h->chroma_weight[i][list][j][1] != 0) {

                             h->use_weight_chroma= 1;

                             h->chroma_weight_flag[list]= 1;
                         }

                     }
                 }else{
                     int j;
                     for(j=0; j<2; j++){

                         h->chroma_weight[i][list][j][0]= chroma_def;
                         h->chroma_weight[i][list][j][1]= 0;

                     }

                 }
             }
         }

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

     }

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

     return 0;
 }
 

 /**
  * Initialize implicit_weight table.

  * @param field  0/1 initialize the weight for interlaced MBAFF

  *                -1 initializes the rest
  */
 static void implicit_weight_table(H264Context *h, int field){

     MpegEncContext * const s = &h->s;

     int ref0, ref1, i, cur_poc, ref_start, ref_count0, ref_count1;

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

     if(field < 0){
         cur_poc = s->current_picture_ptr->poc;
     if(   h->ref_count[0] == 1 && h->ref_count[1] == 1 && !FRAME_MBAFF

        && 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;
     }

         ref_start= 0;
         ref_count0= h->ref_count[0];
         ref_count1= h->ref_count[1];
     }else{
         cur_poc = s->current_picture_ptr->field_poc[field];
         ref_start= 16;
         ref_count0= 16+2*h->ref_count[0];
         ref_count1= 16+2*h->ref_count[1];
     }

 
     h->use_weight= 2;
     h->use_weight_chroma= 2;
     h->luma_log2_weight_denom= 5;
     h->chroma_log2_weight_denom= 5;
 

     for(ref0=ref_start; ref0 < ref_count0; ref0++){

         int poc0 = h->ref_list[0][ref0].poc;

         for(ref1=ref_start; ref1 < ref_count1; ref1++){

             int w = 32;
             if (!h->ref_list[0][ref0].long_ref && !h->ref_list[1][ref1].long_ref) {
                 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 = (tb*tx + 32) >> 8;
                     if(dist_scale_factor >= -64 && dist_scale_factor <= 128)
                         w = 64 - dist_scale_factor;
                 }

             }
             if(field<0){
                 h->implicit_weight[ref0][ref1][0]=
                 h->implicit_weight[ref0][ref1][1]= w;
             }else{
                 h->implicit_weight[ref0][ref1][field]=w;

             }

         }
     }
 }
 

 /**

  * instantaneous decoder refresh.

  */
 static void idr(H264Context *h){

     ff_h264_remove_all_refs(h);

     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=h->next_outputed_poc= INT_MIN;

     h->prev_interlaced_frame = 1;

     idr(h);

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

     h->s.first_field= 0;

     ff_h264_reset_sei(h);

     ff_mpeg_flush(avctx);

 }
 

 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){
     int i;

     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
     }

     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;
     }
 }

 static void field_end(H264Context *h, int in_setup){

     MpegEncContext * const s = &h->s;
     AVCodecContext * const avctx= s->avctx;
     s->mb_y= 0;
 

     if (!in_setup && !s->dropable)
         ff_thread_report_progress((AVFrame*)s->current_picture_ptr, (16*s->mb_height >> FIELD_PICTURE) - 1,
                                  s->picture_structure==PICT_BOTTOM_FIELD);

 
     if (CONFIG_H264_VDPAU_DECODER && s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
         ff_vdpau_h264_set_reference_frames(s);
 

     if(in_setup || !(avctx->active_thread_type&FF_THREAD_FRAME)){
         if(!s->dropable) {
             ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index);
             h->prev_poc_msb= h->poc_msb;
             h->prev_poc_lsb= h->poc_lsb;
         }
         h->prev_frame_num_offset= h->frame_num_offset;
         h->prev_frame_num= h->frame_num;
         h->outputed_poc = h->next_outputed_poc;

     }
 
     if (avctx->hwaccel) {
         if (avctx->hwaccel->end_frame(avctx) < 0)
             av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n");
     }
 
     if (CONFIG_H264_VDPAU_DECODER && s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
         ff_vdpau_h264_picture_complete(s);
 
     /*
      * FIXME: Error handling code does not seem to support interlaced
      * when slices span multiple rows
      * The ff_er_add_slice calls don't work right for bottom
      * fields; they cause massive erroneous error concealing
      * Error marking covers both fields (top and bottom).
      * This causes a mismatched s->error_count
      * and a bad error table. Further, the error count goes to
      * INT_MAX when called for bottom field, because mb_y is
      * past end by one (callers fault) and resync_mb_y != 0
      * causes problems for the first MB line, too.
      */
     if (!FIELD_PICTURE)
         ff_er_frame_end(s);
 
     MPV_frame_end(s);

 
     h->current_slice=0;

 }
 

 /**

  * Replicate 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));

 }
 

 /**

  * computes profile from profile_idc and constraint_set?_flags
  *
  * @param sps SPS
  *
  * @return profile as defined by FF_PROFILE_H264_*
  */
 int ff_h264_get_profile(SPS *sps)
 {
     int profile = sps->profile_idc;
 
     switch(sps->profile_idc) {
     case FF_PROFILE_H264_BASELINE:
         // constraint_set1_flag set to 1
         profile |= (sps->constraint_set_flags & 1<<1) ? FF_PROFILE_H264_CONSTRAINED : 0;
         break;
     case FF_PROFILE_H264_HIGH_10:
     case FF_PROFILE_H264_HIGH_422:
     case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
         // constraint_set3_flag set to 1
         profile |= (sps->constraint_set_flags & 1<<3) ? FF_PROFILE_H264_INTRA : 0;
         break;
     }
 
     return profile;
 }
 
 /**

  * decodes a slice header.

  * This will also call MPV_common_init() and frame_start() as needed.

  *
  * @param h h264context
  * @param h0 h264 master context (differs from 'h' when doing sliced based parallel decoding)
  *

  * @return 0 if okay, <0 if an error occurred, 1 if decoding must not be multithreaded

  */

 static int decode_slice_header(H264Context *h, H264Context *h0){

     MpegEncContext * const s = &h->s;

     MpegEncContext * const s0 = &h0->s;

     unsigned int first_mb_in_slice;

     unsigned int pps_id;

     int num_ref_idx_active_override_flag;

     unsigned int slice_type, tmp, i, j;

     int default_ref_list_done = 0;

     int last_pic_structure;

     s->dropable= h->nal_ref_idc == 0;

     /* FIXME: 2tap qpel isn't implemented for high bit depth. */
     if((s->avctx->flags2 & CODEC_FLAG2_FAST) && !h->nal_ref_idc && !h->pixel_shift){

         s->me.qpel_put= s->dsp.put_2tap_qpel_pixels_tab;
         s->me.qpel_avg= s->dsp.avg_2tap_qpel_pixels_tab;
     }else{
         s->me.qpel_put= s->dsp.put_h264_qpel_pixels_tab;
         s->me.qpel_avg= s->dsp.avg_h264_qpel_pixels_tab;
     }
 

     first_mb_in_slice= get_ue_golomb(&s->gb);
 

     if(first_mb_in_slice == 0){ //FIXME better field boundary detection
         if(h0->current_slice && FIELD_PICTURE){

             field_end(h, 1);

         }
 

         h0->current_slice = 0;

         if (!s0->first_field)

             s->current_picture_ptr= NULL;

     }
 

     slice_type= get_ue_golomb_31(&s->gb);

     if(slice_type > 9){

         av_log(h->s.avctx, AV_LOG_ERROR, "slice type too large (%d) at %d %d\n", h->slice_type, s->mb_x, s->mb_y);

         return -1;

     }

     if(slice_type > 4){
         slice_type -= 5;

         h->slice_type_fixed=1;
     }else
         h->slice_type_fixed=0;

     slice_type= golomb_to_pict_type[ slice_type ];

     if (slice_type == AV_PICTURE_TYPE_I

         || (h0->current_slice != 0 && slice_type == h0->last_slice_type) ) {

         default_ref_list_done = 1;
     }
     h->slice_type= slice_type;

     h->slice_type_nos= slice_type & 3;

     s->pict_type= h->slice_type; // to make a few old functions happy, it's wrong though

     pps_id= get_ue_golomb(&s->gb);

     if(pps_id>=MAX_PPS_COUNT){

         av_log(h->s.avctx, AV_LOG_ERROR, "pps_id out of range\n");

         return -1;
     }

     if(!h0->pps_buffers[pps_id]) {

         av_log(h->s.avctx, AV_LOG_ERROR, "non-existing PPS %u referenced\n", pps_id);

         return -1;
     }

     h->pps= *h0->pps_buffers[pps_id];

     if(!h0->sps_buffers[h->pps.sps_id]) {

         av_log(h->s.avctx, AV_LOG_ERROR, "non-existing SPS %u referenced\n", h->pps.sps_id);

         return -1;
     }

     h->sps = *h0->sps_buffers[h->pps.sps_id];

     s->avctx->profile = ff_h264_get_profile(&h->sps);

     s->avctx->level   = h->sps.level_idc;

     s->avctx->refs    = h->sps.ref_frame_count;

     if(h == h0 && h->dequant_coeff_pps != pps_id){

         h->dequant_coeff_pps = pps_id;

         init_dequant_tables(h);
     }

     s->mb_width= h->sps.mb_width;

     s->mb_height= h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag);

     h->b_stride=  s->mb_width*4;

     s->width = 16*s->mb_width - (2>>CHROMA444)*FFMIN(h->sps.crop_right, (8<<CHROMA444)-1);

     if(h->sps.frame_mbs_only_flag)

         s->height= 16*s->mb_height - (2>>CHROMA444)*FFMIN(h->sps.crop_bottom, (8<<CHROMA444)-1);

     else

         s->height= 16*s->mb_height - (4>>CHROMA444)*FFMIN(h->sps.crop_bottom, (8<<CHROMA444)-1);

 
     if (s->context_initialized

         && (   s->width != s->avctx->width || s->height != s->avctx->height
             || av_cmp_q(h->sps.sar, s->avctx->sample_aspect_ratio))) {

         if(h != h0) {
             av_log_missing_feature(s->avctx, "Width/height changing with threads is", 0);

             return -1;   // width / height changed during parallelized decoding

         }

         free_tables(h, 0);

         flush_dpb(s->avctx);

         MPV_common_end(s);
     }
     if (!s->context_initialized) {

         if (h != h0) {
             av_log(h->s.avctx, AV_LOG_ERROR, "Cannot (re-)initialize context during parallel decoding.\n");

             return -1;
         }

 
         avcodec_set_dimensions(s->avctx, s->width, s->height);
         s->avctx->sample_aspect_ratio= h->sps.sar;

         av_assert0(s->avctx->sample_aspect_ratio.den);

         h->s.avctx->coded_width = 16*s->mb_width;
         h->s.avctx->coded_height = 16*s->mb_height;
 

         if(h->sps.video_signal_type_present_flag){
             s->avctx->color_range = h->sps.full_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
             if(h->sps.colour_description_present_flag){
                 s->avctx->color_primaries = h->sps.color_primaries;
                 s->avctx->color_trc       = h->sps.color_trc;
                 s->avctx->colorspace      = h->sps.colorspace;
             }
         }
 

         if(h->sps.timing_info_present_flag){

             int64_t den= h->sps.time_scale;

             if(h->x264_build < 44U)

                 den *= 2;

             av_reduce(&s->avctx->time_base.num, &s->avctx->time_base.den,

                       h->sps.num_units_in_tick, den, 1<<30);

         }

 
         switch (h->sps.bit_depth_luma) {
             case 9 :

                 s->avctx->pix_fmt = CHROMA444 ? PIX_FMT_YUV444P9 : PIX_FMT_YUV420P9;

                 break;
             case 10 :

                 s->avctx->pix_fmt = CHROMA444 ? PIX_FMT_YUV444P10 : PIX_FMT_YUV420P10;

                 break;
             default:

                 if (CHROMA444){
                     s->avctx->pix_fmt = s->avctx->color_range == AVCOL_RANGE_JPEG ? PIX_FMT_YUVJ444P : PIX_FMT_YUV444P;
                 }else{
                     s->avctx->pix_fmt = s->avctx->get_format(s->avctx,
                                                              s->avctx->codec->pix_fmts ?
                                                              s->avctx->codec->pix_fmts :
                                                              s->avctx->color_range == AVCOL_RANGE_JPEG ?
                                                              hwaccel_pixfmt_list_h264_jpeg_420 :
                                                              ff_hwaccel_pixfmt_list_420);
                 }

         }
 

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

         if (MPV_common_init(s) < 0) {
             av_log(h->s.avctx, AV_LOG_ERROR, "MPV_common_init() failed.\n");

             return -1;

         }

         s->first_field = 0;

         h->prev_interlaced_frame = 1;

         init_scan_tables(h);

         if (ff_h264_alloc_tables(h) < 0) {
             av_log(h->s.avctx, AV_LOG_ERROR, "Could not allocate memory for h264\n");
             return AVERROR(ENOMEM);
         }

         if (!HAVE_THREADS || !(s->avctx->active_thread_type&FF_THREAD_SLICE)) {

             if (context_init(h) < 0) {
                 av_log(h->s.avctx, AV_LOG_ERROR, "context_init() failed.\n");

                 return -1;

             }

         } else {
             for(i = 1; i < s->avctx->thread_count; i++) {
                 H264Context *c;
                 c = h->thread_context[i] = av_malloc(sizeof(H264Context));
                 memcpy(c, h->s.thread_context[i], sizeof(MpegEncContext));
                 memset(&c->s + 1, 0, sizeof(H264Context) - sizeof(MpegEncContext));
                 c->h264dsp = h->h264dsp;
                 c->sps = h->sps;
                 c->pps = h->pps;

                 c->pixel_shift = h->pixel_shift;

                 init_scan_tables(c);
                 clone_tables(c, h, i);
             }
 
             for(i = 0; i < s->avctx->thread_count; i++)

                 if (context_init(h->thread_context[i]) < 0) {
                     av_log(h->s.avctx, AV_LOG_ERROR, "context_init() failed.\n");

                     return -1;

                 }

         }

     }
 
     h->frame_num= get_bits(&s->gb, h->sps.log2_max_frame_num);
 

     h->mb_mbaff = 0;

     h->mb_aff_frame = 0;

     last_pic_structure = s0->picture_structure;

     if(h->sps.frame_mbs_only_flag){
         s->picture_structure= PICT_FRAME;
     }else{

         if(get_bits1(&s->gb)) { //field_pic_flag

             s->picture_structure= PICT_TOP_FIELD + get_bits1(&s->gb); //bottom_field_flag

         } else {

             s->picture_structure= PICT_FRAME;

             h->mb_aff_frame = h->sps.mb_aff;

         }

     }

     h->mb_field_decoding_flag= s->picture_structure != PICT_FRAME;

 
     if(h0->current_slice == 0){

         // Shorten frame num gaps so we don't have to allocate reference frames just to throw them away
         if(h->frame_num != h->prev_frame_num) {
             int unwrap_prev_frame_num = h->prev_frame_num, max_frame_num = 1<<h->sps.log2_max_frame_num;
 
             if (unwrap_prev_frame_num > h->frame_num) unwrap_prev_frame_num -= max_frame_num;
 
             if ((h->frame_num - unwrap_prev_frame_num) > h->sps.ref_frame_count) {
                 unwrap_prev_frame_num = (h->frame_num - h->sps.ref_frame_count) - 1;
                 if (unwrap_prev_frame_num < 0)
                     unwrap_prev_frame_num += max_frame_num;
 
                 h->prev_frame_num = unwrap_prev_frame_num;
             }
         }

         while(h->frame_num !=  h->prev_frame_num &&
               h->frame_num != (h->prev_frame_num+1)%(1<<h->sps.log2_max_frame_num)){

             Picture *prev = h->short_ref_count ? h->short_ref[0] : NULL;

             av_log(h->s.avctx, AV_LOG_DEBUG, "Frame num gap %d %d\n", h->frame_num, h->prev_frame_num);

             if (ff_h264_frame_start(h) < 0)

                 return -1;

             h->prev_frame_num++;
             h->prev_frame_num %= 1<<h->sps.log2_max_frame_num;
             s->current_picture_ptr->frame_num= h->prev_frame_num;

             ff_thread_report_progress((AVFrame*)s->current_picture_ptr, INT_MAX, 0);
             ff_thread_report_progress((AVFrame*)s->current_picture_ptr, INT_MAX, 1);

             ff_generate_sliding_window_mmcos(h);
             ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index);

             /* Error concealment: if a ref is missing, copy the previous ref in its place.
              * FIXME: avoiding a memcpy would be nice, but ref handling makes many assumptions
              * about there being no actual duplicates.
              * FIXME: this doesn't copy padding for out-of-frame motion vectors.  Given we're
              * concealing a lost frame, this probably isn't noticable by comparison, but it should
              * be fixed. */

             if (h->short_ref_count) {
                 if (prev) {
                     av_image_copy(h->short_ref[0]->data, h->short_ref[0]->linesize,
                                   (const uint8_t**)prev->data, prev->linesize,

                                   s->avctx->pix_fmt, s->mb_width*16, s->mb_height*16);

                     h->short_ref[0]->poc = prev->poc+2;
                 }
                 h->short_ref[0]->frame_num = h->prev_frame_num;
             }

         }
 

         /* See if we have a decoded first field looking for a pair... */
         if (s0->first_field) {
             assert(s0->current_picture_ptr);
             assert(s0->current_picture_ptr->data[0]);
             assert(s0->current_picture_ptr->reference != DELAYED_PIC_REF);
 
             /* figure out if we have a complementary field pair */
             if (!FIELD_PICTURE || s->picture_structure == last_pic_structure) {
                 /*
                  * Previous field is unmatched. Don't display it, but let it
                  * remain for reference if marked as such.
                  */
                 s0->current_picture_ptr = NULL;
                 s0->first_field = FIELD_PICTURE;
 
             } else {
                 if (h->nal_ref_idc &&
                         s0->current_picture_ptr->reference &&
                         s0->current_picture_ptr->frame_num != h->frame_num) {
                     /*
                      * This and previous field were reference, but had
                      * different frame_nums. Consider this field first in
                      * pair. Throw away previous field except for reference
                      * purposes.
                      */
                     s0->first_field = 1;
                     s0->current_picture_ptr = NULL;
 
                 } else {
                     /* Second field in complementary pair */
                     s0->first_field = 0;
                 }
             }
 
         } else {
             /* Frame or first field in a potentially complementary pair */
             assert(!s0->current_picture_ptr);
             s0->first_field = FIELD_PICTURE;
         }
 

         if(!FIELD_PICTURE || s0->first_field) {
             if (ff_h264_frame_start(h) < 0) {
                 s0->first_field = 0;
                 return -1;
             }
         } else {
             ff_release_unused_pictures(s, 0);

         }

     }
     if(h != h0)
         clone_slice(h, h0);
 
     s->current_picture_ptr->frame_num= h->frame_num; //FIXME frame_num cleanup
 

     assert(s->mb_num == s->mb_width * s->mb_height);

     if(first_mb_in_slice << FIELD_OR_MBAFF_PICTURE >= s->mb_num ||

        first_mb_in_slice                    >= s->mb_num){
         av_log(h->s.avctx, AV_LOG_ERROR, "first_mb_in_slice overflow\n");

         return -1;
     }

     s->resync_mb_x = s->mb_x = first_mb_in_slice % s->mb_width;

     s->resync_mb_y = s->mb_y = (first_mb_in_slice / s->mb_width) << FIELD_OR_MBAFF_PICTURE;
     if (s->picture_structure == PICT_BOTTOM_FIELD)
         s->resync_mb_y = s->mb_y = s->mb_y + 1;

     assert(s->mb_y < s->mb_height);

     if(s->picture_structure==PICT_FRAME){
         h->curr_pic_num=   h->frame_num;
         h->max_pic_num= 1<< h->sps.log2_max_frame_num;
     }else{

         h->curr_pic_num= 2*h->frame_num + 1;

         h->max_pic_num= 1<<(h->sps.log2_max_frame_num + 1);
     }

     if(h->nal_unit_type == NAL_IDR_SLICE){

         get_ue_golomb(&s->gb); /* idr_pic_id */

     }

     if(h->sps.poc_type==0){
         h->poc_lsb= get_bits(&s->gb, h->sps.log2_max_poc_lsb);

         if(h->pps.pic_order_present==1 && s->picture_structure==PICT_FRAME){
             h->delta_poc_bottom= get_se_golomb(&s->gb);
         }
     }

     if(h->sps.poc_type==1 && !h->sps.delta_pic_order_always_zero_flag){
         h->delta_poc[0]= get_se_golomb(&s->gb);

         if(h->pps.pic_order_present==1 && s->picture_structure==PICT_FRAME)
             h->delta_poc[1]= get_se_golomb(&s->gb);
     }

     init_poc(h);

     if(h->pps.redundant_pic_cnt_present){
         h->redundant_pic_count= get_ue_golomb(&s->gb);
     }
 

     //set defaults, might be overridden a few lines later

     h->ref_count[0]= h->pps.ref_count[0];
     h->ref_count[1]= h->pps.ref_count[1];
 

     if(h->slice_type_nos != AV_PICTURE_TYPE_I){

         unsigned max= (16<<(s->picture_structure != PICT_FRAME))-1;

         if(h->slice_type_nos == AV_PICTURE_TYPE_B){

             h->direct_spatial_mv_pred= get_bits1(&s->gb);
         }
         num_ref_idx_active_override_flag= get_bits1(&s->gb);

         if(num_ref_idx_active_override_flag){
             h->ref_count[0]= get_ue_golomb(&s->gb) + 1;

             if(h->slice_type_nos==AV_PICTURE_TYPE_B)

                 h->ref_count[1]= get_ue_golomb(&s->gb) + 1;
 

         }
         if(h->ref_count[0]-1 > max || h->ref_count[1]-1 > max){
             av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow\n");
             h->ref_count[0]= h->ref_count[1]= 1;
             return -1;

         }

         if(h->slice_type_nos == AV_PICTURE_TYPE_B)

             h->list_count= 2;
         else
             h->list_count= 1;
     }else

         h->ref_count[1]= h->ref_count[0]= h->list_count= 0;

     if(!default_ref_list_done){

         ff_h264_fill_default_ref_list(h);

     }
 

     if(h->slice_type_nos!=AV_PICTURE_TYPE_I && ff_h264_decode_ref_pic_list_reordering(h) < 0) {
         h->ref_count[1]= h->ref_count[0]= 0;

         return -1;

     }

     if(h->slice_type_nos!=AV_PICTURE_TYPE_I){

         s->last_picture_ptr= &h->ref_list[0][0];

         ff_copy_picture(&s->last_picture, s->last_picture_ptr);

     }

     if(h->slice_type_nos==AV_PICTURE_TYPE_B){

         s->next_picture_ptr= &h->ref_list[1][0];

         ff_copy_picture(&s->next_picture, s->next_picture_ptr);

     }
 

     if(   (h->pps.weighted_pred          && h->slice_type_nos == AV_PICTURE_TYPE_P )
        ||  (h->pps.weighted_bipred_idc==1 && h->slice_type_nos== AV_PICTURE_TYPE_B ) )

         pred_weight_table(h);

     else if(h->pps.weighted_bipred_idc==2 && h->slice_type_nos== AV_PICTURE_TYPE_B){

         implicit_weight_table(h, -1);

     }else {

         h->use_weight = 0;

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

     if(h->nal_ref_idc)

         ff_h264_decode_ref_pic_marking(h0, &s->gb);

     if(FRAME_MBAFF){

         ff_h264_fill_mbaff_ref_list(h);

         if(h->pps.weighted_bipred_idc==2 && h->slice_type_nos== AV_PICTURE_TYPE_B){

             implicit_weight_table(h, 0);
             implicit_weight_table(h, 1);
         }
     }
 

     if(h->slice_type_nos==AV_PICTURE_TYPE_B && !h->direct_spatial_mv_pred)

         ff_h264_direct_dist_scale_factor(h);
     ff_h264_direct_ref_list_init(h);

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

         tmp = get_ue_golomb_31(&s->gb);

         if(tmp > 2){
             av_log(s->avctx, AV_LOG_ERROR, "cabac_init_idc overflow\n");
             return -1;
         }
         h->cabac_init_idc= tmp;
     }

 
     h->last_qscale_diff = 0;

     tmp = h->pps.init_qp + get_se_golomb(&s->gb);

     if(tmp>51+6*(h->sps.bit_depth_luma-8)){

         av_log(s->avctx, AV_LOG_ERROR, "QP %u out of range\n", tmp);

         return -1;
     }

     s->qscale= tmp;

     h->chroma_qp[0] = get_chroma_qp(h, 0, s->qscale);
     h->chroma_qp[1] = get_chroma_qp(h, 1, s->qscale);

     //FIXME qscale / qp ... stuff

     if(h->slice_type == AV_PICTURE_TYPE_SP){

         get_bits1(&s->gb); /* sp_for_switch_flag */

     }

     if(h->slice_type==AV_PICTURE_TYPE_SP || h->slice_type == AV_PICTURE_TYPE_SI){

         get_se_golomb(&s->gb); /* slice_qs_delta */

     }
 

     h->deblocking_filter = 1;

     h->slice_alpha_c0_offset = 52;
     h->slice_beta_offset = 52;

     if( h->pps.deblocking_filter_parameters_present ) {

         tmp= get_ue_golomb_31(&s->gb);

         if(tmp > 2){
             av_log(s->avctx, AV_LOG_ERROR, "deblocking_filter_idc %u out of range\n", tmp);
             return -1;
         }
         h->deblocking_filter= tmp;

         if(h->deblocking_filter < 2)

             h->deblocking_filter^= 1; // 1<->0
 
         if( h->deblocking_filter ) {

             h->slice_alpha_c0_offset += get_se_golomb(&s->gb) << 1;
             h->slice_beta_offset     += get_se_golomb(&s->gb) << 1;
             if(   h->slice_alpha_c0_offset > 104U
                || h->slice_beta_offset     > 104U){
                 av_log(s->avctx, AV_LOG_ERROR, "deblocking filter parameters %d %d out of range\n", h->slice_alpha_c0_offset, h->slice_beta_offset);
                 return -1;
             }

         }

     }

     if(   s->avctx->skip_loop_filter >= AVDISCARD_ALL

        ||(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY && h->slice_type_nos != AV_PICTURE_TYPE_I)
        ||(s->avctx->skip_loop_filter >= AVDISCARD_BIDIR  && h->slice_type_nos == AV_PICTURE_TYPE_B)

        ||(s->avctx->skip_loop_filter >= AVDISCARD_NONREF && h->nal_ref_idc == 0))
         h->deblocking_filter= 0;
 

     if(h->deblocking_filter == 1 && h0->max_contexts > 1) {

         if(s->avctx->flags2 & CODEC_FLAG2_FAST) {
             /* Cheat slightly for speed:

                Do not bother to deblock across slices. */

             h->deblocking_filter = 2;
         } else {

             h0->max_contexts = 1;
             if(!h0->single_decode_warning) {
                 av_log(s->avctx, AV_LOG_INFO, "Cannot parallelize deblocking type 1, decoding such frames in sequential order\n");
                 h0->single_decode_warning = 1;
             }

             if (h != h0) {
                 av_log(h->s.avctx, AV_LOG_ERROR, "Deblocking switched inside frame.\n");

                 return 1;
             }

         }

     }

     h->qp_thresh= 15 + 52 - FFMIN(h->slice_alpha_c0_offset, h->slice_beta_offset) - FFMAX3(0, h->pps.chroma_qp_index_offset[0], h->pps.chroma_qp_index_offset[1]);

 #if 0 //FMO
     if( h->pps.num_slice_groups > 1  && h->pps.mb_slice_group_map_type >= 3 && h->pps.mb_slice_group_map_type <= 5)
         slice_group_change_cycle= get_bits(&s->gb, ?);
 #endif
 

     h0->last_slice_type = slice_type;
     h->slice_num = ++h0->current_slice;

     if(h->slice_num >= MAX_SLICES){

         av_log(s->avctx, AV_LOG_ERROR, "Too many slices (%d >= %d), increase MAX_SLICES and recompile\n", h->slice_num, MAX_SLICES);

     }

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

         int id_list[16];

         int *ref2frm= h->ref2frm[h->slice_num&(MAX_SLICES-1)][j];

         for(i=0; i<16; i++){
             id_list[i]= 60;
             if(h->ref_list[j][i].data[0]){
                 int k;
                 uint8_t *base= h->ref_list[j][i].base[0];
                 for(k=0; k<h->short_ref_count; k++)
                     if(h->short_ref[k]->base[0] == base){
                         id_list[i]= k;
                         break;
                     }
                 for(k=0; k<h->long_ref_count; k++)
                     if(h->long_ref[k] && h->long_ref[k]->base[0] == base){
                         id_list[i]= h->short_ref_count + k;
                         break;
                     }
             }
         }
 

         ref2frm[0]=
         ref2frm[1]= -1;

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

             ref2frm[i+2]= 4*id_list[i]

                           +(h->ref_list[j][i].reference&3);

         ref2frm[18+0]=
         ref2frm[18+1]= -1;
         for(i=16; i<48; i++)

             ref2frm[i+4]= 4*id_list[(i-16)>>1]

                           +(h->ref_list[j][i].reference&3);

     }
 

     //FIXME: fix draw_edges+PAFF+frame threads

     h->emu_edge_width= (s->flags&CODEC_FLAG_EMU_EDGE || (!h->sps.frame_mbs_only_flag && s->avctx->active_thread_type)) ? 0 : 16;

     h->emu_edge_height= (FRAME_MBAFF || FIELD_PICTURE) ? 0 : h->emu_edge_width;

     if(s->avctx->debug&FF_DEBUG_PICT_INFO){

         av_log(h->s.avctx, AV_LOG_DEBUG, "slice:%d %s mb:%d %c%s%s pps:%u frame:%d poc:%d/%d ref:%d/%d qp:%d loop:%d:%d:%d weight:%d%s %s\n",

                h->slice_num,
                (s->picture_structure==PICT_FRAME ? "F" : s->picture_structure==PICT_TOP_FIELD ? "T" : "B"),

                first_mb_in_slice,

                av_get_picture_type_char(h->slice_type), h->slice_type_fixed ? " fix" : "", h->nal_unit_type == NAL_IDR_SLICE ? " IDR" : "",

                pps_id, h->frame_num,
                s->current_picture_ptr->field_poc[0], s->current_picture_ptr->field_poc[1],
                h->ref_count[0], h->ref_count[1],
                s->qscale,

                h->deblocking_filter, h->slice_alpha_c0_offset/2-26, h->slice_beta_offset/2-26,

                h->use_weight,

                h->use_weight==1 && h->use_weight_chroma ? "c" : "",

                h->slice_type == AV_PICTURE_TYPE_B ? (h->direct_spatial_mv_pred ? "SPAT" : "TEMP") : ""

                );
     }
 
     return 0;
 }
 

 int ff_h264_get_slice_type(const H264Context *h)

 {
     switch (h->slice_type) {

     case AV_PICTURE_TYPE_P:  return 0;
     case AV_PICTURE_TYPE_B:  return 1;
     case AV_PICTURE_TYPE_I:  return 2;
     case AV_PICTURE_TYPE_SP: return 3;
     case AV_PICTURE_TYPE_SI: return 4;

     default:         return -1;
     }
 }
 

 /**
  *
  * @return non zero if the loop filter can be skiped
  */
 static int fill_filter_caches(H264Context *h, int mb_type){
     MpegEncContext * const s = &h->s;
     const int mb_xy= h->mb_xy;
     int top_xy, left_xy[2];
     int top_type, left_type[2];
 
     top_xy     = mb_xy  - (s->mb_stride << MB_FIELD);
 
     //FIXME deblocking could skip the intra and nnz parts.
 
     /* Wow, what a mess, why didn't they simplify the interlacing & intra
      * stuff, I can't imagine that these complex rules are worth it. */
 
     left_xy[1] = left_xy[0] = mb_xy-1;
     if(FRAME_MBAFF){
         const int left_mb_field_flag     = IS_INTERLACED(s->current_picture.mb_type[mb_xy-1]);
         const int curr_mb_field_flag     = IS_INTERLACED(mb_type);
         if(s->mb_y&1){
             if (left_mb_field_flag != curr_mb_field_flag) {
                 left_xy[0] -= s->mb_stride;
             }
         }else{
             if(curr_mb_field_flag){
                 top_xy      += s->mb_stride & (((s->current_picture.mb_type[top_xy    ]>>7)&1)-1);
             }
             if (left_mb_field_flag != curr_mb_field_flag) {
                 left_xy[1] += s->mb_stride;
             }
         }
     }
 
     h->top_mb_xy = top_xy;
     h->left_mb_xy[0] = left_xy[0];
     h->left_mb_xy[1] = left_xy[1];
     {
         //for sufficiently low qp, filtering wouldn't do anything
         //this is a conservative estimate: could also check beta_offset and more accurate chroma_qp
         int qp_thresh = h->qp_thresh; //FIXME strictly we should store qp_thresh for each mb of a slice
         int qp = s->current_picture.qscale_table[mb_xy];
         if(qp <= qp_thresh
            && (left_xy[0]<0 || ((qp + s->current_picture.qscale_table[left_xy[0]] + 1)>>1) <= qp_thresh)
            && (top_xy   < 0 || ((qp + s->current_picture.qscale_table[top_xy    ] + 1)>>1) <= qp_thresh)){
             if(!FRAME_MBAFF)
                 return 1;
             if(   (left_xy[0]< 0            || ((qp + s->current_picture.qscale_table[left_xy[1]             ] + 1)>>1) <= qp_thresh)
                && (top_xy    < s->mb_stride || ((qp + s->current_picture.qscale_table[top_xy    -s->mb_stride] + 1)>>1) <= qp_thresh))
                 return 1;
         }
     }
 
     top_type     = s->current_picture.mb_type[top_xy]    ;
     left_type[0] = s->current_picture.mb_type[left_xy[0]];
     left_type[1] = s->current_picture.mb_type[left_xy[1]];
     if(h->deblocking_filter == 2){
         if(h->slice_table[top_xy     ] != h->slice_num) top_type= 0;
         if(h->slice_table[left_xy[0] ] != h->slice_num) left_type[0]= left_type[1]= 0;
     }else{
         if(h->slice_table[top_xy     ] == 0xFFFF) top_type= 0;
         if(h->slice_table[left_xy[0] ] == 0xFFFF) left_type[0]= left_type[1] =0;
     }
     h->top_type    = top_type    ;
     h->left_type[0]= left_type[0];
     h->left_type[1]= left_type[1];
 
     if(IS_INTRA(mb_type))
         return 0;
 

     AV_COPY32(&h->non_zero_count_cache[4+8* 1], &h->non_zero_count[mb_xy][ 0]);
     AV_COPY32(&h->non_zero_count_cache[4+8* 2], &h->non_zero_count[mb_xy][ 4]);
     AV_COPY32(&h->non_zero_count_cache[4+8* 3], &h->non_zero_count[mb_xy][ 8]);
     AV_COPY32(&h->non_zero_count_cache[4+8* 4], &h->non_zero_count[mb_xy][12]);

 
     h->cbp= h->cbp_table[mb_xy];
 
     {
         int list;
         for(list=0; list<h->list_count; list++){
             int8_t *ref;
             int y, b_stride;
             int16_t (*mv_dst)[2];
             int16_t (*mv_src)[2];
 
             if(!USES_LIST(mb_type, list)){
                 fill_rectangle(  h->mv_cache[list][scan8[0]], 4, 4, 8, pack16to32(0,0), 4);
                 AV_WN32A(&h->ref_cache[list][scan8[ 0]], ((LIST_NOT_USED)&0xFF)*0x01010101u);
                 AV_WN32A(&h->ref_cache[list][scan8[ 2]], ((LIST_NOT_USED)&0xFF)*0x01010101u);
                 AV_WN32A(&h->ref_cache[list][scan8[ 8]], ((LIST_NOT_USED)&0xFF)*0x01010101u);
                 AV_WN32A(&h->ref_cache[list][scan8[10]], ((LIST_NOT_USED)&0xFF)*0x01010101u);
                 continue;
             }
 
             ref = &s->current_picture.ref_index[list][4*mb_xy];
             {
                 int (*ref2frm)[64] = h->ref2frm[ h->slice_num&(MAX_SLICES-1) ][0] + (MB_MBAFF ? 20 : 2);
                 AV_WN32A(&h->ref_cache[list][scan8[ 0]], (pack16to32(ref2frm[list][ref[0]],ref2frm[list][ref[1]])&0x00FF00FF)*0x0101);
                 AV_WN32A(&h->ref_cache[list][scan8[ 2]], (pack16to32(ref2frm[list][ref[0]],ref2frm[list][ref[1]])&0x00FF00FF)*0x0101);
                 ref += 2;
                 AV_WN32A(&h->ref_cache[list][scan8[ 8]], (pack16to32(ref2frm[list][ref[0]],ref2frm[list][ref[1]])&0x00FF00FF)*0x0101);
                 AV_WN32A(&h->ref_cache[list][scan8[10]], (pack16to32(ref2frm[list][ref[0]],ref2frm[list][ref[1]])&0x00FF00FF)*0x0101);
             }
 
             b_stride = h->b_stride;
             mv_dst   = &h->mv_cache[list][scan8[0]];
             mv_src   = &s->current_picture.motion_val[list][4*s->mb_x + 4*s->mb_y*b_stride];
             for(y=0; y<4; y++){
                 AV_COPY128(mv_dst + 8*y, mv_src + y*b_stride);
             }
 
         }
     }
 
 
 /*
 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){

         AV_COPY32(&h->non_zero_count_cache[4+8*0], &h->non_zero_count[top_xy][3*4]);

     }
 
     if(left_type[0]){

         h->non_zero_count_cache[3+8*1]= h->non_zero_count[left_xy[0]][3+0*4];
         h->non_zero_count_cache[3+8*2]= h->non_zero_count[left_xy[0]][3+1*4];
         h->non_zero_count_cache[3+8*3]= h->non_zero_count[left_xy[0]][3+2*4];
         h->non_zero_count_cache[3+8*4]= h->non_zero_count[left_xy[0]][3+3*4];

     }
 
     // CAVLC 8x8dct requires NNZ values for residual decoding that differ from what the loop filter needs
     if(!CABAC && h->pps.transform_8x8_mode){
         if(IS_8x8DCT(top_type)){
             h->non_zero_count_cache[4+8*0]=

             h->non_zero_count_cache[5+8*0]= (h->cbp_table[top_xy] & 0x4000) >> 12;

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

             h->non_zero_count_cache[7+8*0]= (h->cbp_table[top_xy] & 0x8000) >> 12;

         }
         if(IS_8x8DCT(left_type[0])){
             h->non_zero_count_cache[3+8*1]=

             h->non_zero_count_cache[3+8*2]= (h->cbp_table[left_xy[0]]&0x2000) >> 12; //FIXME check MBAFF

         }
         if(IS_8x8DCT(left_type[1])){
             h->non_zero_count_cache[3+8*3]=

             h->non_zero_count_cache[3+8*4]= (h->cbp_table[left_xy[1]]&0x8000) >> 12; //FIXME check MBAFF

         }
 
         if(IS_8x8DCT(mb_type)){
             h->non_zero_count_cache[scan8[0   ]]= h->non_zero_count_cache[scan8[1   ]]=

             h->non_zero_count_cache[scan8[2   ]]= h->non_zero_count_cache[scan8[3   ]]= (h->cbp & 0x1000) >> 12;

 
             h->non_zero_count_cache[scan8[0+ 4]]= h->non_zero_count_cache[scan8[1+ 4]]=

             h->non_zero_count_cache[scan8[2+ 4]]= h->non_zero_count_cache[scan8[3+ 4]]= (h->cbp & 0x2000) >> 12;

 
             h->non_zero_count_cache[scan8[0+ 8]]= h->non_zero_count_cache[scan8[1+ 8]]=

             h->non_zero_count_cache[scan8[2+ 8]]= h->non_zero_count_cache[scan8[3+ 8]]= (h->cbp & 0x4000) >> 12;

 
             h->non_zero_count_cache[scan8[0+12]]= h->non_zero_count_cache[scan8[1+12]]=

             h->non_zero_count_cache[scan8[2+12]]= h->non_zero_count_cache[scan8[3+12]]= (h->cbp & 0x8000) >> 12;

         }
     }
 
     if(IS_INTER(mb_type) || IS_DIRECT(mb_type)){
         int list;
         for(list=0; list<h->list_count; list++){
             if(USES_LIST(top_type, list)){
                 const int b_xy= h->mb2b_xy[top_xy] + 3*h->b_stride;
                 const int b8_xy= 4*top_xy + 2;
                 int (*ref2frm)[64] = h->ref2frm[ h->slice_table[top_xy]&(MAX_SLICES-1) ][0] + (MB_MBAFF ? 20 : 2);
                 AV_COPY128(h->mv_cache[list][scan8[0] + 0 - 1*8], s->current_picture.motion_val[list][b_xy + 0]);
                 h->ref_cache[list][scan8[0] + 0 - 1*8]=
                 h->ref_cache[list][scan8[0] + 1 - 1*8]= ref2frm[list][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]= ref2frm[list][s->current_picture.ref_index[list][b8_xy + 1]];
             }else{
                 AV_ZERO128(h->mv_cache[list][scan8[0] + 0 - 1*8]);
                 AV_WN32A(&h->ref_cache[list][scan8[0] + 0 - 1*8], ((LIST_NOT_USED)&0xFF)*0x01010101u);
             }
 
             if(!IS_INTERLACED(mb_type^left_type[0])){
                 if(USES_LIST(left_type[0], list)){
                     const int b_xy= h->mb2b_xy[left_xy[0]] + 3;
                     const int b8_xy= 4*left_xy[0] + 1;
                     int (*ref2frm)[64] = h->ref2frm[ h->slice_table[left_xy[0]]&(MAX_SLICES-1) ][0] + (MB_MBAFF ? 20 : 2);
                     AV_COPY32(h->mv_cache[list][scan8[0] - 1 + 0 ], s->current_picture.motion_val[list][b_xy + h->b_stride*0]);
                     AV_COPY32(h->mv_cache[list][scan8[0] - 1 + 8 ], s->current_picture.motion_val[list][b_xy + h->b_stride*1]);
                     AV_COPY32(h->mv_cache[list][scan8[0] - 1 +16 ], s->current_picture.motion_val[list][b_xy + h->b_stride*2]);
                     AV_COPY32(h->mv_cache[list][scan8[0] - 1 +24 ], s->current_picture.motion_val[list][b_xy + h->b_stride*3]);
                     h->ref_cache[list][scan8[0] - 1 + 0 ]=
                     h->ref_cache[list][scan8[0] - 1 + 8 ]= ref2frm[list][s->current_picture.ref_index[list][b8_xy + 2*0]];
                     h->ref_cache[list][scan8[0] - 1 +16 ]=
                     h->ref_cache[list][scan8[0] - 1 +24 ]= ref2frm[list][s->current_picture.ref_index[list][b8_xy + 2*1]];
                 }else{
                     AV_ZERO32(h->mv_cache [list][scan8[0] - 1 + 0 ]);
                     AV_ZERO32(h->mv_cache [list][scan8[0] - 1 + 8 ]);
                     AV_ZERO32(h->mv_cache [list][scan8[0] - 1 +16 ]);
                     AV_ZERO32(h->mv_cache [list][scan8[0] - 1 +24 ]);
                     h->ref_cache[list][scan8[0] - 1 + 0  ]=
                     h->ref_cache[list][scan8[0] - 1 + 8  ]=
                     h->ref_cache[list][scan8[0] - 1 + 16 ]=
                     h->ref_cache[list][scan8[0] - 1 + 24 ]= LIST_NOT_USED;
                 }
             }
         }
     }
 
     return 0;
 }
 

 static void loop_filter(H264Context *h, int start_x, int end_x){

     MpegEncContext * const s = &h->s;
     uint8_t  *dest_y, *dest_cb, *dest_cr;
     int linesize, uvlinesize, mb_x, mb_y;
     const int end_mb_y= s->mb_y + FRAME_MBAFF;
     const int old_slice_type= h->slice_type;

     const int pixel_shift = h->pixel_shift;

 
     if(h->deblocking_filter) {

         for(mb_x= start_x; mb_x<end_x; mb_x++){

             for(mb_y=end_mb_y - FRAME_MBAFF; mb_y<= end_mb_y; mb_y++){

                 int mb_xy, mb_type;

                 mb_xy = h->mb_xy = mb_x + mb_y*s->mb_stride;
                 h->slice_num= h->slice_table[mb_xy];
                 mb_type= s->current_picture.mb_type[mb_xy];
                 h->list_count= h->list_counts[mb_xy];
 
                 if(FRAME_MBAFF)
                     h->mb_mbaff = h->mb_field_decoding_flag = !!IS_INTERLACED(mb_type);
 
                 s->mb_x= mb_x;
                 s->mb_y= mb_y;

                 dest_y  = s->current_picture.data[0] + ((mb_x << pixel_shift) + mb_y * s->linesize  ) * 16;

                 dest_cb = s->current_picture.data[1] + ((mb_x << pixel_shift) + mb_y * s->uvlinesize) * (8 << CHROMA444);
                 dest_cr = s->current_picture.data[2] + ((mb_x << pixel_shift) + mb_y * s->uvlinesize) * (8 << CHROMA444);

                     //FIXME simplify above
 
                 if (MB_FIELD) {
                     linesize   = h->mb_linesize   = s->linesize * 2;
                     uvlinesize = h->mb_uvlinesize = s->uvlinesize * 2;
                     if(mb_y&1){ //FIXME move out of this function?
                         dest_y -= s->linesize*15;

                         dest_cb-= s->uvlinesize*((8 << CHROMA444)-1);
                         dest_cr-= s->uvlinesize*((8 << CHROMA444)-1);

                     }
                 } else {
                     linesize   = h->mb_linesize   = s->linesize;
                     uvlinesize = h->mb_uvlinesize = s->uvlinesize;
                 }

                 backup_mb_border(h, dest_y, dest_cb, dest_cr, linesize, uvlinesize, CHROMA444, 0);

                 if(fill_filter_caches(h, mb_type))

                     continue;

                 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 (FRAME_MBAFF) {

                     ff_h264_filter_mb     (h, mb_x, mb_y, dest_y, dest_cb, dest_cr, linesize, uvlinesize);
                 } else {
                     ff_h264_filter_mb_fast(h, mb_x, mb_y, dest_y, dest_cb, dest_cr, linesize, uvlinesize);
                 }
             }
         }
     }
     h->slice_type= old_slice_type;

     s->mb_x= end_x;

     s->mb_y= end_mb_y - FRAME_MBAFF;

     h->chroma_qp[0] = get_chroma_qp(h, 0, s->qscale);
     h->chroma_qp[1] = get_chroma_qp(h, 1, s->qscale);

 }
 

 static void predict_field_decoding_flag(H264Context *h){
     MpegEncContext * const s = &h->s;
     const int mb_xy= s->mb_x + s->mb_y*s->mb_stride;
     int mb_type = (h->slice_table[mb_xy-1] == h->slice_num)
                 ? s->current_picture.mb_type[mb_xy-1]
                 : (h->slice_table[mb_xy-s->mb_stride] == h->slice_num)
                 ? s->current_picture.mb_type[mb_xy-s->mb_stride]
                 : 0;
     h->mb_mbaff = h->mb_field_decoding_flag = IS_INTERLACED(mb_type) ? 1 : 0;
 }
 

 /**
  * Draw edges and report progress for the last MB row.
  */
 static void decode_finish_row(H264Context *h){
     MpegEncContext * const s = &h->s;
     int top = 16*(s->mb_y >> FIELD_PICTURE);
     int height = 16 << FRAME_MBAFF;
     int deblock_border = (16 + 4) << FRAME_MBAFF;
     int pic_height = 16*s->mb_height >> FIELD_PICTURE;
 
     if (h->deblocking_filter) {
         if((top + height) >= pic_height)
             height += deblock_border;
 
         top -= deblock_border;
     }
 
     if (top >= pic_height || (top + height) < h->emu_edge_height)
         return;
 
     height = FFMIN(height, pic_height - top);
     if (top < h->emu_edge_height) {
         height = top+height;
         top = 0;
     }
 
     ff_draw_horiz_band(s, top, height);
 
     if (s->dropable) return;
 
     ff_thread_report_progress((AVFrame*)s->current_picture_ptr, top + height - 1,
                              s->picture_structure==PICT_BOTTOM_FIELD);
 }
 

 static int decode_slice(struct AVCodecContext *avctx, void *arg){
     H264Context *h = *(void**)arg;

     MpegEncContext * const s = &h->s;
     const int part_mask= s->partitioned_frame ? (AC_END|AC_ERROR) : 0x7F;

     int lf_x_start = s->mb_x;

 
     s->mb_skip_run= -1;
 

     h->is_complex = FRAME_MBAFF || s->picture_structure != PICT_FRAME || s->codec_id != CODEC_ID_H264 ||

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

     if( h->pps.cabac ) {
         /* realign */
         align_get_bits( &s->gb );
 
         /* init cabac */

         ff_init_cabac_states( &h->cabac);

         ff_init_cabac_decoder( &h->cabac,
                                s->gb.buffer + get_bits_count(&s->gb)/8,

                                (get_bits_left(&s->gb) + 7)/8);

 
         ff_h264_init_cabac_states(h);

         for(;;){

 //START_TIMER

             int ret = ff_h264_decode_mb_cabac(h);

             int eos;

 //STOP_TIMER("decode_mb_cabac")

             if(ret>=0) ff_h264_hl_decode_mb(h);

             if( ret >= 0 && FRAME_MBAFF ) { //FIXME optimal? or let mb_decode decode 16x32 ?

                 s->mb_y++;
 

                 ret = ff_h264_decode_mb_cabac(h);

                 if(ret>=0) ff_h264_hl_decode_mb(h);

                 s->mb_y--;
             }

             eos = get_cabac_terminate( &h->cabac );

             if((s->workaround_bugs & FF_BUG_TRUNCATED) && h->cabac.bytestream > h->cabac.bytestream_end + 2){
                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);

                 if (s->mb_x >= lf_x_start) loop_filter(h, lf_x_start, s->mb_x + 1);

                 return 0;
             }

             if( ret < 0 || h->cabac.bytestream > h->cabac.bytestream_end + 2) {

                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d, bytestream (%td)\n", s->mb_x, s->mb_y, h->cabac.bytestream_end - h->cabac.bytestream);

                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
                 return -1;
             }
 
             if( ++s->mb_x >= s->mb_width ) {

                 loop_filter(h, lf_x_start, s->mb_x);
                 s->mb_x = lf_x_start = 0;

                 decode_finish_row(h);

                 ++s->mb_y;

                 if(FIELD_OR_MBAFF_PICTURE) {

                     ++s->mb_y;

                     if(FRAME_MBAFF && s->mb_y < s->mb_height)
                         predict_field_decoding_flag(h);

                 }

             }
 

             if( eos || s->mb_y >= s->mb_height ) {

                 tprintf(s->avctx, "slice end %d %d\n", get_bits_count(&s->gb), s->gb.size_in_bits);

                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);

                 if (s->mb_x > lf_x_start) loop_filter(h, lf_x_start, s->mb_x);

                 return 0;

             }
         }
 
     } else {
         for(;;){

             int ret = ff_h264_decode_mb_cavlc(h);

             if(ret>=0) ff_h264_hl_decode_mb(h);

             if(ret>=0 && FRAME_MBAFF){ //FIXME optimal? or let mb_decode decode 16x32 ?

                 s->mb_y++;

                 ret = ff_h264_decode_mb_cavlc(h);

                 if(ret>=0) ff_h264_hl_decode_mb(h);

                 s->mb_y--;
             }
 
             if(ret<0){
                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
                 return -1;
             }

 
             if(++s->mb_x >= s->mb_width){

                 loop_filter(h, lf_x_start, s->mb_x);
                 s->mb_x = lf_x_start = 0;

                 decode_finish_row(h);

                 ++s->mb_y;

                 if(FIELD_OR_MBAFF_PICTURE) {

                     ++s->mb_y;

                     if(FRAME_MBAFF && s->mb_y < s->mb_height)
                         predict_field_decoding_flag(h);

                 }
                 if(s->mb_y >= s->mb_height){

                     tprintf(s->avctx, "slice end %d %d\n", get_bits_count(&s->gb), s->gb.size_in_bits);

                     if(   get_bits_count(&s->gb) == s->gb.size_in_bits
                        || get_bits_count(&s->gb) <  s->gb.size_in_bits && s->avctx->error_recognition < FF_ER_AGGRESSIVE) {

                         ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 
                         return 0;
                     }else{
                         ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 
                         return -1;
                     }
                 }
             }
 
             if(get_bits_count(&s->gb) >= s->gb.size_in_bits && s->mb_skip_run<=0){

                 tprintf(s->avctx, "slice end %d %d\n", get_bits_count(&s->gb), s->gb.size_in_bits);

                 if(get_bits_count(&s->gb) == s->gb.size_in_bits ){
                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);

                     if (s->mb_x > lf_x_start) loop_filter(h, lf_x_start, s->mb_x);

 
                     return 0;
                 }else{
                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
 
                     return -1;
                 }
             }

         }
     }

 #if 0
     for(;s->mb_y < s->mb_height; s->mb_y++){
         for(;s->mb_x < s->mb_width; s->mb_x++){
             int ret= decode_mb(h);

             ff_h264_hl_decode_mb(h);

 
             if(ret<0){

                 av_log(s->avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

                 ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
 
                 return -1;
             }

             if(++s->mb_x >= s->mb_width){
                 s->mb_x=0;
                 if(++s->mb_y >= s->mb_height){
                     if(get_bits_count(s->gb) == s->gb.size_in_bits){
                         ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 
                         return 0;
                     }else{
                         ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 
                         return -1;
                     }
                 }
             }

             if(get_bits_count(s->?gb) >= s->gb?.size_in_bits){
                 if(get_bits_count(s->gb) == s->gb.size_in_bits){
                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, (AC_END|DC_END|MV_END)&part_mask);
 
                     return 0;
                 }else{
                     ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, (AC_ERROR|DC_ERROR|MV_ERROR)&part_mask);
 
                     return -1;
                 }
             }
         }
         s->mb_x=0;
         ff_draw_horiz_band(s, 16*s->mb_y, 16);
     }
 #endif
     return -1; //not reached
 }
 

 /**
  * Call decode_slice() for each context.
  *
  * @param h h264 master context
  * @param context_count number of contexts to execute
  */
 static void execute_decode_slices(H264Context *h, int context_count){
     MpegEncContext * const s = &h->s;
     AVCodecContext * const avctx= s->avctx;
     H264Context *hx;
     int i;
 

     if (s->avctx->hwaccel)
         return;

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

         return;

     if(context_count == 1) {

         decode_slice(avctx, &h);

     } else {
         for(i = 1; i < context_count; i++) {
             hx = h->thread_context[i];

             hx->s.error_recognition = avctx->error_recognition;

             hx->s.error_count = 0;

             hx->x264_build= h->x264_build;

         }
 
         avctx->execute(avctx, (void *)decode_slice,

                        h->thread_context, NULL, context_count, sizeof(void*));

 
         /* pull back stuff from slices to master context */
         hx = h->thread_context[context_count - 1];
         s->mb_x = hx->s.mb_x;
         s->mb_y = hx->s.mb_y;

         s->dropable = hx->s.dropable;
         s->picture_structure = hx->s.picture_structure;

         for(i = 1; i < context_count; i++)
             h->s.error_count += h->thread_context[i]->s.error_count;
     }
 }
 
 

 static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size){

     MpegEncContext * const s = &h->s;
     AVCodecContext * const avctx= s->avctx;

     H264Context *hx; ///< thread context

     int buf_index;
     int context_count;
     int next_avc;
     int pass = !(avctx->active_thread_type & FF_THREAD_FRAME);
     int nals_needed=0; ///< number of NALs that need decoding before the next frame thread starts
     int nal_index;

     h->max_contexts = (HAVE_THREADS && (s->avctx->active_thread_type&FF_THREAD_SLICE)) ? avctx->thread_count : 1;

     if(!(s->flags2 & CODEC_FLAG2_CHUNKS)){

         h->current_slice = 0;

         if (!s->first_field)

             s->current_picture_ptr= NULL;

         ff_h264_reset_sei(h);

     }
 

     for(;pass <= 1;pass++){
         buf_index = 0;
         context_count = 0;
         next_avc = h->is_avc ? 0 : buf_size;
         nal_index = 0;

     for(;;){
         int consumed;
         int dst_length;
         int bit_length;

         const uint8_t *ptr;

         int i, nalsize = 0;

         int err;

         if(buf_index >= next_avc) {

             if(buf_index >= buf_size) break;
             nalsize = 0;
             for(i = 0; i < h->nal_length_size; i++)
                 nalsize = (nalsize << 8) | buf[buf_index++];

             if(nalsize <= 0 || nalsize > buf_size - buf_index){
                 av_log(h->s.avctx, AV_LOG_ERROR, "AVC: nal size %d\n", nalsize);
                 break;

             }

             next_avc= buf_index + nalsize;

         } else {
             // start code prefix search

             for(; buf_index + 3 < next_avc; buf_index++){

                 // This should always succeed in the first iteration.
                 if(buf[buf_index] == 0 && buf[buf_index+1] == 0 && buf[buf_index+2] == 1)
                     break;

             }

             if(buf_index+3 >= buf_size) break;

             buf_index+=3;

             if(buf_index >= next_avc) continue;

         }

         hx = h->thread_context[context_count];
 

         ptr= ff_h264_decode_nal(hx, buf + buf_index, &dst_length, &consumed, next_avc - buf_index);

         if (ptr==NULL || dst_length < 0){

             return -1;
         }

         i= buf_index + consumed;
         if((s->workaround_bugs & FF_BUG_AUTODETECT) && i+3<next_avc &&
            buf[i]==0x00 && buf[i+1]==0x00 && buf[i+2]==0x01 && buf[i+3]==0xE0)
             s->workaround_bugs |= FF_BUG_TRUNCATED;
 
         if(!(s->workaround_bugs & FF_BUG_TRUNCATED)){

         while(dst_length > 0 && ptr[dst_length - 1] == 0)

             dst_length--;

         }

         bit_length= !dst_length ? 0 : (8*dst_length - ff_h264_decode_rbsp_trailing(h, ptr + dst_length - 1));

 
         if(s->avctx->debug&FF_DEBUG_STARTCODE){

             av_log(h->s.avctx, AV_LOG_DEBUG, "NAL %d/%d at %d/%d length %d\n", hx->nal_unit_type, hx->nal_ref_idc, buf_index, buf_size, dst_length);

         }

         if (h->is_avc && (nalsize != consumed) && nalsize){

             av_log(h->s.avctx, AV_LOG_DEBUG, "AVC: Consumed only %d bytes instead of %d\n", consumed, nalsize);

         }

         buf_index += consumed;

         nal_index++;
 
         if(pass == 0) {
             // packets can sometimes contain multiple PPS/SPS
             // e.g. two PAFF field pictures in one packet, or a demuxer which splits NALs strangely
             // if so, when frame threading we can't start the next thread until we've read all of them
             switch (hx->nal_unit_type) {
                 case NAL_SPS:
                 case NAL_PPS:

                 case NAL_IDR_SLICE:
                 case NAL_SLICE:

                     nals_needed = nal_index;
             }
             continue;
         }

         //FIXME do not discard SEI id

         if(avctx->skip_frame >= AVDISCARD_NONREF && h->nal_ref_idc  == 0)

             continue;

       again:
         err = 0;
         switch(hx->nal_unit_type){

         case NAL_IDR_SLICE:

             if (h->nal_unit_type != NAL_IDR_SLICE) {
                 av_log(h->s.avctx, AV_LOG_ERROR, "Invalid mix of idr and non-idr slices");
                 return -1;
             }

             idr(h); //FIXME ensure we don't loose some frames if there is reordering

         case NAL_SLICE:

             init_get_bits(&hx->s.gb, ptr, bit_length);
             hx->intra_gb_ptr=
             hx->inter_gb_ptr= &hx->s.gb;
             hx->s.data_partitioning = 0;
 
             if((err = decode_slice_header(hx, h)))
                break;
 

             s->current_picture_ptr->key_frame |=
                     (hx->nal_unit_type == NAL_IDR_SLICE) ||
                     (h->sei_recovery_frame_cnt >= 0);
 

             if (h->current_slice == 1) {

                 if(!(s->flags2 & CODEC_FLAG2_CHUNKS)) {

                     decode_postinit(h, nal_index >= nals_needed);

                 }
 

                 if (s->avctx->hwaccel && s->avctx->hwaccel->start_frame(s->avctx, NULL, 0) < 0)

                     return -1;

                 if(CONFIG_H264_VDPAU_DECODER && s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
                     ff_vdpau_h264_picture_start(s);

             }
 

             if(hx->redundant_pic_count==0

                && (avctx->skip_frame < AVDISCARD_NONREF || hx->nal_ref_idc)

                && (avctx->skip_frame < AVDISCARD_BIDIR  || hx->slice_type_nos!=AV_PICTURE_TYPE_B)
                && (avctx->skip_frame < AVDISCARD_NONKEY || hx->slice_type_nos==AV_PICTURE_TYPE_I)

                && avctx->skip_frame < AVDISCARD_ALL){

                 if(avctx->hwaccel) {
                     if (avctx->hwaccel->decode_slice(avctx, &buf[buf_index - consumed], consumed) < 0)
                         return -1;
                 }else

                 if(CONFIG_H264_VDPAU_DECODER && s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){

                     static const uint8_t start_code[] = {0x00, 0x00, 0x01};

                     ff_vdpau_add_data_chunk(s, start_code, sizeof(start_code));
                     ff_vdpau_add_data_chunk(s, &buf[buf_index - consumed], consumed );

                 }else

                     context_count++;

             }

             break;
         case NAL_DPA:

             init_get_bits(&hx->s.gb, ptr, bit_length);
             hx->intra_gb_ptr=
             hx->inter_gb_ptr= NULL;

 
             if ((err = decode_slice_header(hx, h)) < 0)
                 break;
 

             hx->s.data_partitioning = 1;

             break;
         case NAL_DPB:

             init_get_bits(&hx->intra_gb, ptr, bit_length);
             hx->intra_gb_ptr= &hx->intra_gb;

             break;
         case NAL_DPC:

             init_get_bits(&hx->inter_gb, ptr, bit_length);
             hx->inter_gb_ptr= &hx->inter_gb;

             if(hx->redundant_pic_count==0 && hx->intra_gb_ptr && hx->s.data_partitioning

                && s->context_initialized

                && (avctx->skip_frame < AVDISCARD_NONREF || hx->nal_ref_idc)

                && (avctx->skip_frame < AVDISCARD_BIDIR  || hx->slice_type_nos!=AV_PICTURE_TYPE_B)
                && (avctx->skip_frame < AVDISCARD_NONKEY || hx->slice_type_nos==AV_PICTURE_TYPE_I)

                && avctx->skip_frame < AVDISCARD_ALL)

                 context_count++;

             break;
         case NAL_SEI:

             init_get_bits(&s->gb, ptr, bit_length);

             ff_h264_decode_sei(h);

             break;
         case NAL_SPS:
             init_get_bits(&s->gb, ptr, bit_length);

             ff_h264_decode_seq_parameter_set(h);

             if (s->flags& CODEC_FLAG_LOW_DELAY ||
                 (h->sps.bitstream_restriction_flag && !h->sps.num_reorder_frames))

                 s->low_delay=1;

             if(avctx->has_b_frames < 2)
                 avctx->has_b_frames= !s->low_delay;

 
             if (avctx->bits_per_raw_sample != h->sps.bit_depth_luma) {
                 if (h->sps.bit_depth_luma >= 8 && h->sps.bit_depth_luma <= 10) {
                     avctx->bits_per_raw_sample = h->sps.bit_depth_luma;

                     h->pixel_shift = h->sps.bit_depth_luma > 8;

 
                     ff_h264dsp_init(&h->h264dsp, h->sps.bit_depth_luma);
                     ff_h264_pred_init(&h->hpc, s->codec_id, h->sps.bit_depth_luma);
                     dsputil_init(&s->dsp, s->avctx);
                 } else {
                     av_log(avctx, AV_LOG_DEBUG, "Unsupported bit depth: %d\n", h->sps.bit_depth_luma);
                     return -1;
                 }
             }

             break;
         case NAL_PPS:
             init_get_bits(&s->gb, ptr, bit_length);

             ff_h264_decode_picture_parameter_set(h, bit_length);

 
             break;

         case NAL_AUD:
         case NAL_END_SEQUENCE:
         case NAL_END_STREAM:
         case NAL_FILLER_DATA:
         case NAL_SPS_EXT:
         case NAL_AUXILIARY_SLICE:

             break;

         default:

             av_log(avctx, AV_LOG_DEBUG, "Unknown NAL code: %d (%d bits)\n", hx->nal_unit_type, bit_length);

         }
 

         if(context_count == h->max_contexts) {
             execute_decode_slices(h, context_count);
             context_count = 0;
         }
 
         if (err < 0)
             av_log(h->s.avctx, AV_LOG_ERROR, "decode_slice_header error\n");
         else if(err == 1) {
             /* Slice could not be decoded in parallel mode, copy down
              * NAL unit stuff to context 0 and restart. Note that

              * rbsp_buffer is not transferred, but since we no longer

              * run in parallel mode this should not be an issue. */
             h->nal_unit_type = hx->nal_unit_type;
             h->nal_ref_idc   = hx->nal_ref_idc;
             hx = h;
             goto again;
         }
     }

     }

     if(context_count)
         execute_decode_slices(h, context_count);

     return buf_index;
 }
 
 /**

  * returns the number of bytes consumed for building the current frame

  */
 static int get_consumed_bytes(MpegEncContext *s, int pos, int buf_size){

         if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)

         if(pos+10>buf_size) pos=buf_size; // oops ;)
 
         return pos;
 }
 

 static int decode_frame(AVCodecContext *avctx,

                              void *data, int *data_size,

                              AVPacket *avpkt)

 {

     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;

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

     AVFrame *pict = data;

     int buf_index;

     s->flags= avctx->flags;

     s->flags2= avctx->flags2;

    /* end of stream, output what is still in the buffers */

  out:

     if (buf_size == 0) {

         Picture *out;
         int i, out_idx;
 

         s->current_picture_ptr = NULL;
 

 //FIXME factorize this with the output code below
         out = h->delayed_pic[0];
         out_idx = 0;

         for(i=1; h->delayed_pic[i] && !h->delayed_pic[i]->key_frame && !h->delayed_pic[i]->mmco_reset; i++)

             if(h->delayed_pic[i]->poc < out->poc){
                 out = h->delayed_pic[i];
                 out_idx = i;
             }
 
         for(i=out_idx; h->delayed_pic[i]; i++)
             h->delayed_pic[i] = h->delayed_pic[i+1];
 
         if(out){
             *data_size = sizeof(AVFrame);
             *pict= *(AVFrame*)out;
         }
 

         return 0;
     }

     buf_index=decode_nal_units(h, buf, buf_size);

     if(buf_index < 0)

         return -1;
 

     if (!s->current_picture_ptr && h->nal_unit_type == NAL_END_SEQUENCE) {
         buf_size = 0;
         goto out;
     }
 

     if(!(s->flags2 & CODEC_FLAG2_CHUNKS) && !s->current_picture_ptr){

         if (avctx->skip_frame >= AVDISCARD_NONREF)

             return 0;

         av_log(avctx, AV_LOG_ERROR, "no frame!\n");
         return -1;
     }
 

     if(!(s->flags2 & CODEC_FLAG2_CHUNKS) || (s->mb_y >= s->mb_height && s->mb_height)){

         if(s->flags2 & CODEC_FLAG2_CHUNKS) decode_postinit(h, 1);

         field_end(h, 0);
 
         if (!h->next_output_pic) {

             /* Wait for second field. */
             *data_size = 0;
 
         } else {

             *data_size = sizeof(AVFrame);
             *pict = *(AVFrame*)h->next_output_pic;

         }

     }
 

     assert(pict->data[0] || !*data_size);

     ff_print_debug_info(s, pict);

 //printf("out %d\n", (int)pict->data[0]);
 
     return get_consumed_bytes(s, buf_index, buf_size);
 }
 #if 0
 static inline void fill_mb_avail(H264Context *h){
     MpegEncContext * const s = &h->s;

     const int mb_xy= s->mb_x + s->mb_y*s->mb_stride;

 
     if(s->mb_y){

         h->mb_avail[0]= s->mb_x                 && h->slice_table[mb_xy - s->mb_stride - 1] == h->slice_num;
         h->mb_avail[1]=                            h->slice_table[mb_xy - s->mb_stride    ] == h->slice_num;
         h->mb_avail[2]= s->mb_x+1 < s->mb_width && h->slice_table[mb_xy - s->mb_stride + 1] == h->slice_num;

     }else{
         h->mb_avail[0]=
         h->mb_avail[1]=
         h->mb_avail[2]= 0;
     }
     h->mb_avail[3]= s->mb_x && h->slice_table[mb_xy - 1] == h->slice_num;
     h->mb_avail[4]= 1; //FIXME move out
     h->mb_avail[5]= 0; //FIXME move out
 }
 #endif
 

 #ifdef TEST

 #undef printf

 #undef random

 #define COUNT 8000
 #define SIZE (COUNT*40)

 int main(void){

     int i;
     uint8_t temp[SIZE];
     PutBitContext pb;
     GetBitContext gb;
 //    int int_temp[10000];
     DSPContext dsp;
     AVCodecContext avctx;

     dsputil_init(&dsp, &avctx);
 

     init_put_bits(&pb, temp, SIZE);

     printf("testing unsigned exp golomb\n");
     for(i=0; i<COUNT; i++){
         START_TIMER
         set_ue_golomb(&pb, i);
         STOP_TIMER("set_ue_golomb");
     }
     flush_put_bits(&pb);

     init_get_bits(&gb, temp, 8*SIZE);
     for(i=0; i<COUNT; i++){
         int j, s;

         s= show_bits(&gb, 24);

         START_TIMER
         j= get_ue_golomb(&gb);
         if(j != i){

             printf("mismatch! at %d (%d should be %d) bits:%6X\n", i, j, i, s);

 //            return -1;
         }
         STOP_TIMER("get_ue_golomb");
     }

     init_put_bits(&pb, temp, SIZE);

     printf("testing signed exp golomb\n");
     for(i=0; i<COUNT; i++){
         START_TIMER
         set_se_golomb(&pb, i - COUNT/2);
         STOP_TIMER("set_se_golomb");
     }
     flush_put_bits(&pb);

     init_get_bits(&gb, temp, 8*SIZE);
     for(i=0; i<COUNT; i++){
         int j, s;

         s= show_bits(&gb, 24);

         START_TIMER
         j= get_se_golomb(&gb);
         if(j != i - COUNT/2){

             printf("mismatch! at %d (%d should be %d) bits:%6X\n", i, j, i, s);

 //            return -1;
         }
         STOP_TIMER("get_se_golomb");
     }
 

 #if 0

     printf("testing 4x4 (I)DCT\n");

     DCTELEM block[16];
     uint8_t src[16], ref[16];
     uint64_t error= 0, max_error=0;
 
     for(i=0; i<COUNT; i++){
         int j;
 //        printf("%d %d %d\n", r1, r2, (r2-r1)*16);
         for(j=0; j<16; j++){
             ref[j]= random()%255;
             src[j]= random()%255;
         }
 
         h264_diff_dct_c(block, src, ref, 4);

         //normalize
         for(j=0; j<16; j++){
 //            printf("%d ", block[j]);
             block[j]= block[j]*4;
             if(j&1) block[j]= (block[j]*4 + 2)/5;
             if(j&4) block[j]= (block[j]*4 + 2)/5;
         }
 //        printf("\n");

         h->h264dsp.h264_idct_add(ref, block, 4);

 /*        for(j=0; j<16; j++){
             printf("%d ", ref[j]);
         }
         printf("\n");*/

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

             int diff= FFABS(src[j] - ref[j]);

             error+= diff*diff;
             max_error= FFMAX(max_error, diff);
         }
     }
     printf("error=%f max_error=%d\n", ((float)error)/COUNT/16, (int)max_error );
     printf("testing quantizer\n");
     for(qp=0; qp<52; qp++){
         for(i=0; i<16; i++)
             src1_block[i]= src2_block[i]= random()%255;

     }
     printf("Testing NAL layer\n");

     uint8_t bitstream[COUNT];
     uint8_t nal[COUNT*2];
     H264Context h;
     memset(&h, 0, sizeof(H264Context));

     for(i=0; i<COUNT; i++){
         int zeros= i;
         int nal_length;
         int consumed;
         int out_length;
         uint8_t *out;
         int j;

         for(j=0; j<COUNT; j++){
             bitstream[j]= (random() % 255) + 1;
         }

         for(j=0; j<zeros; j++){
             int pos= random() % COUNT;
             while(bitstream[pos] == 0){
                 pos++;
                 pos %= COUNT;
             }
             bitstream[pos]=0;
         }

         START_TIMER

         nal_length= encode_nal(&h, nal, bitstream, COUNT, COUNT*2);
         if(nal_length<0){
             printf("encoding failed\n");
             return -1;
         }

         out= ff_h264_decode_nal(&h, nal, &out_length, &consumed, nal_length);

 
         STOP_TIMER("NAL")