text: /*
   * Copyright (C) 2004 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
   */
  
  #include "libavutil/intmath.h"
  #include "libavutil/libm.h"
  #include "libavutil/log.h"
  #include "libavutil/opt.h"
  #include "libavutil/pixdesc.h"
  #include "avcodec.h"
  #include "internal.h"
  #include "packet_internal.h"
  #include "snow_dwt.h"
  #include "snow.h"
  
  #include "rangecoder.h"
  #include "mathops.h"
  
  #include "mpegvideo.h"
  #include "h263.h"
  
  static av_cold int encode_init(AVCodecContext *avctx)
  {
      SnowContext *s = avctx->priv_data;
      int plane_index, ret;
      int i;
  
  #if FF_API_PRIVATE_OPT
  FF_DISABLE_DEPRECATION_WARNINGS
      if (avctx->prediction_method)
          s->pred = avctx->prediction_method;
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
      if(s->pred == DWT_97
         && (avctx->flags & AV_CODEC_FLAG_QSCALE)
         && avctx->global_quality == 0){
          av_log(avctx, AV_LOG_ERROR, "The 9/7 wavelet is incompatible with lossless mode.\n");
          return AVERROR(EINVAL);
      }
  
      s->spatial_decomposition_type= s->pred; //FIXME add decorrelator type r transform_type
  
      s->mv_scale       = (avctx->flags & AV_CODEC_FLAG_QPEL) ? 2 : 4;
      s->block_max_depth= (avctx->flags & AV_CODEC_FLAG_4MV ) ? 1 : 0;
  
      for(plane_index=0; plane_index<3; plane_index++){
          s->plane[plane_index].diag_mc= 1;
          s->plane[plane_index].htaps= 6;
          s->plane[plane_index].hcoeff[0]=  40;
          s->plane[plane_index].hcoeff[1]= -10;
          s->plane[plane_index].hcoeff[2]=   2;
          s->plane[plane_index].fast_mc= 1;
      }
  
      if ((ret = ff_snow_common_init(avctx)) < 0) {
          return ret;
      }
      ff_mpegvideoencdsp_init(&s->mpvencdsp, avctx);
  
      ff_snow_alloc_blocks(s);
  
      s->version=0;
  
      s->m.avctx   = avctx;
      s->m.bit_rate= avctx->bit_rate;
      s->m.lmin    = avctx->mb_lmin;
      s->m.lmax    = avctx->mb_lmax;
      s->m.mb_num  = (avctx->width * avctx->height + 255) / 256; // For ratecontrol
  
      s->m.me.temp      =
      s->m.me.scratchpad= av_mallocz_array((avctx->width+64), 2*16*2*sizeof(uint8_t));
      s->m.me.map       = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
      s->m.me.score_map = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
      s->m.sc.obmc_scratchpad= av_mallocz(MB_SIZE*MB_SIZE*12*sizeof(uint32_t));
      if (!s->m.me.scratchpad || !s->m.me.map || !s->m.me.score_map || !s->m.sc.obmc_scratchpad)
          return AVERROR(ENOMEM);
  
      ff_h263_encode_init(&s->m); //mv_penalty
  
      s->max_ref_frames = av_clip(avctx->refs, 1, MAX_REF_FRAMES);
  
      if(avctx->flags&AV_CODEC_FLAG_PASS1){
          if(!avctx->stats_out)
              avctx->stats_out = av_mallocz(256);
  
          if (!avctx->stats_out)
              return AVERROR(ENOMEM);
      }
      if((avctx->flags&AV_CODEC_FLAG_PASS2) || !(avctx->flags&AV_CODEC_FLAG_QSCALE)){
          ret = ff_rate_control_init(&s->m);
          if(ret < 0)
              return ret;
      }
      s->pass1_rc= !(avctx->flags & (AV_CODEC_FLAG_QSCALE|AV_CODEC_FLAG_PASS2));
  
      switch(avctx->pix_fmt){
      case AV_PIX_FMT_YUV444P:
  //    case AV_PIX_FMT_YUV422P:
      case AV_PIX_FMT_YUV420P:
  //    case AV_PIX_FMT_YUV411P:
      case AV_PIX_FMT_YUV410P:
          s->nb_planes = 3;
          s->colorspace_type= 0;
          break;
      case AV_PIX_FMT_GRAY8:
          s->nb_planes = 1;
          s->colorspace_type = 1;
          break;
  /*    case AV_PIX_FMT_RGB32:
          s->colorspace= 1;
          break;*/
      default:
          av_log(avctx, AV_LOG_ERROR, "pixel format not supported\n");
          return AVERROR_PATCHWELCOME;
      }
  
      ret = av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift,
                                             &s->chroma_v_shift);
      if (ret) {
          av_log(avctx, AV_LOG_ERROR, "pixel format invalid or unknown\n");
          return ret;
      }
  
      ff_set_cmp(&s->mecc, s->mecc.me_cmp, s->avctx->me_cmp);
      ff_set_cmp(&s->mecc, s->mecc.me_sub_cmp, s->avctx->me_sub_cmp);
  
      s->input_picture = av_frame_alloc();
      if (!s->input_picture)
          return AVERROR(ENOMEM);
  
      if ((ret = ff_snow_get_buffer(s, s->input_picture)) < 0)
          return ret;
  
      if(s->motion_est == FF_ME_ITER){
          int size= s->b_width * s->b_height << 2*s->block_max_depth;
          for(i=0; i<s->max_ref_frames; i++){
              s->ref_mvs[i]= av_mallocz_array(size, sizeof(int16_t[2]));
              s->ref_scores[i]= av_mallocz_array(size, sizeof(uint32_t));
              if (!s->ref_mvs[i] || !s->ref_scores[i])
                  return AVERROR(ENOMEM);
          }
      }
  
      return 0;
  }
  
  //near copy & paste from dsputil, FIXME
  static int pix_sum(uint8_t * pix, int line_size, int w, int h)
  {
      int s, i, j;
  
      s = 0;
      for (i = 0; i < h; i++) {
          for (j = 0; j < w; j++) {
              s += pix[0];
              pix ++;
          }
          pix += line_size - w;
      }
      return s;
  }
  
  //near copy & paste from dsputil, FIXME
  static int pix_norm1(uint8_t * pix, int line_size, int w)
  {
      int s, i, j;
      const uint32_t *sq = ff_square_tab + 256;
  
      s = 0;
      for (i = 0; i < w; i++) {
          for (j = 0; j < w; j ++) {
              s += sq[pix[0]];
              pix ++;
          }
          pix += line_size - w;
      }
      return s;
  }
  
  static inline int get_penalty_factor(int lambda, int lambda2, int type){
      switch(type&0xFF){
      default:
      case FF_CMP_SAD:
          return lambda>>FF_LAMBDA_SHIFT;
      case FF_CMP_DCT:
          return (3*lambda)>>(FF_LAMBDA_SHIFT+1);
      case FF_CMP_W53:
          return (4*lambda)>>(FF_LAMBDA_SHIFT);
      case FF_CMP_W97:
          return (2*lambda)>>(FF_LAMBDA_SHIFT);
      case FF_CMP_SATD:
      case FF_CMP_DCT264:
          return (2*lambda)>>FF_LAMBDA_SHIFT;
      case FF_CMP_RD:
      case FF_CMP_PSNR:
      case FF_CMP_SSE:
      case FF_CMP_NSSE:
          return lambda2>>FF_LAMBDA_SHIFT;
      case FF_CMP_BIT:
          return 1;
      }
  }
  
  //FIXME copy&paste
  #define P_LEFT P[1]
  #define P_TOP P[2]
  #define P_TOPRIGHT P[3]
  #define P_MEDIAN P[4]
  #define P_MV1 P[9]
  #define FLAG_QPEL   1 //must be 1
  
  static int encode_q_branch(SnowContext *s, int level, int x, int y){
      uint8_t p_buffer[1024];
      uint8_t i_buffer[1024];
      uint8_t p_state[sizeof(s->block_state)];
      uint8_t i_state[sizeof(s->block_state)];
      RangeCoder pc, ic;
      uint8_t *pbbak= s->c.bytestream;
      uint8_t *pbbak_start= s->c.bytestream_start;
      int score, score2, iscore, i_len, p_len, block_s, sum, base_bits;
      const int w= s->b_width  << s->block_max_depth;
      const int h= s->b_height << s->block_max_depth;
      const int rem_depth= s->block_max_depth - level;
      const int index= (x + y*w) << rem_depth;
      const int block_w= 1<<(LOG2_MB_SIZE - level);
      int trx= (x+1)<<rem_depth;
      int try= (y+1)<<rem_depth;
      const BlockNode *left  = x ? &s->block[index-1] : &null_block;
      const BlockNode *top   = y ? &s->block[index-w] : &null_block;
      const BlockNode *right = trx<w ? &s->block[index+1] : &null_block;
      const BlockNode *bottom= try<h ? &s->block[index+w] : &null_block;
      const BlockNode *tl    = y && x ? &s->block[index-w-1] : left;
      const BlockNode *tr    = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
      int pl = left->color[0];
      int pcb= left->color[1];
      int pcr= left->color[2];
      int pmx, pmy;
      int mx=0, my=0;
      int l,cr,cb;
      const int stride= s->current_picture->linesize[0];
      const int uvstride= s->current_picture->linesize[1];
      uint8_t *current_data[3]= { s->input_picture->data[0] + (x + y*  stride)*block_w,
                                  s->input_picture->data[1] + ((x*block_w)>>s->chroma_h_shift) + ((y*uvstride*block_w)>>s->chroma_v_shift),
                                  s->input_picture->data[2] + ((x*block_w)>>s->chroma_h_shift) + ((y*uvstride*block_w)>>s->chroma_v_shift)};
      int P[10][2];
      int16_t last_mv[3][2];
      int qpel= !!(s->avctx->flags & AV_CODEC_FLAG_QPEL); //unused
      const int shift= 1+qpel;
      MotionEstContext *c= &s->m.me;
      int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
      int mx_context= av_log2(2*FFABS(left->mx - top->mx));
      int my_context= av_log2(2*FFABS(left->my - top->my));
      int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
      int ref, best_ref, ref_score, ref_mx, ref_my;
  
      av_assert0(sizeof(s->block_state) >= 256);
      if(s->keyframe){
          set_blocks(s, level, x, y, pl, pcb, pcr, 0, 0, 0, BLOCK_INTRA);
          return 0;
      }
  
  //    clip predictors / edge ?
  
      P_LEFT[0]= left->mx;
      P_LEFT[1]= left->my;
      P_TOP [0]= top->mx;
      P_TOP [1]= top->my;
      P_TOPRIGHT[0]= tr->mx;
      P_TOPRIGHT[1]= tr->my;
  
      last_mv[0][0]= s->block[index].mx;
      last_mv[0][1]= s->block[index].my;
      last_mv[1][0]= right->mx;
      last_mv[1][1]= right->my;
      last_mv[2][0]= bottom->mx;
      last_mv[2][1]= bottom->my;
  
      s->m.mb_stride=2;
      s->m.mb_x=
      s->m.mb_y= 0;
      c->skip= 0;
  
      av_assert1(c->  stride ==   stride);
      av_assert1(c->uvstride == uvstride);
  
      c->penalty_factor    = get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_cmp);
      c->sub_penalty_factor= get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_sub_cmp);
      c->mb_penalty_factor = get_penalty_factor(s->lambda, s->lambda2, c->avctx->mb_cmp);
      c->current_mv_penalty= c->mv_penalty[s->m.f_code=1] + MAX_DMV;
  
      c->xmin = - x*block_w - 16+3;
      c->ymin = - y*block_w - 16+3;
      c->xmax = - (x+1)*block_w + (w<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3;
      c->ymax = - (y+1)*block_w + (h<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3;
  
      if(P_LEFT[0]     > (c->xmax<<shift)) P_LEFT[0]    = (c->xmax<<shift);
      if(P_LEFT[1]     > (c->ymax<<shift)) P_LEFT[1]    = (c->ymax<<shift);
      if(P_TOP[0]      > (c->xmax<<shift)) P_TOP[0]     = (c->xmax<<shift);
      if(P_TOP[1]      > (c->ymax<<shift)) P_TOP[1]     = (c->ymax<<shift);
      if(P_TOPRIGHT[0] < (c->xmin * (1<<shift))) P_TOPRIGHT[0]= (c->xmin * (1<<shift));
      if(P_TOPRIGHT[0] > (c->xmax<<shift)) P_TOPRIGHT[0]= (c->xmax<<shift); //due to pmx no clip
      if(P_TOPRIGHT[1] > (c->ymax<<shift)) P_TOPRIGHT[1]= (c->ymax<<shift);
  
      P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
      P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);
  
      if (!y) {
          c->pred_x= P_LEFT[0];
          c->pred_y= P_LEFT[1];
      } else {
          c->pred_x = P_MEDIAN[0];
          c->pred_y = P_MEDIAN[1];
      }
  
      score= INT_MAX;
      best_ref= 0;
      for(ref=0; ref<s->ref_frames; ref++){
          init_ref(c, current_data, s->last_picture[ref]->data, NULL, block_w*x, block_w*y, 0);
  
          ref_score= ff_epzs_motion_search(&s->m, &ref_mx, &ref_my, P, 0, /*ref_index*/ 0, last_mv,
                                           (1<<16)>>shift, level-LOG2_MB_SIZE+4, block_w);
  
          av_assert2(ref_mx >= c->xmin);
          av_assert2(ref_mx <= c->xmax);
          av_assert2(ref_my >= c->ymin);
          av_assert2(ref_my <= c->ymax);
  
          ref_score= c->sub_motion_search(&s->m, &ref_mx, &ref_my, ref_score, 0, 0, level-LOG2_MB_SIZE+4, block_w);
          ref_score= ff_get_mb_score(&s->m, ref_mx, ref_my, 0, 0, level-LOG2_MB_SIZE+4, block_w, 0);
          ref_score+= 2*av_log2(2*ref)*c->penalty_factor;
          if(s->ref_mvs[ref]){
              s->ref_mvs[ref][index][0]= ref_mx;
              s->ref_mvs[ref][index][1]= ref_my;
              s->ref_scores[ref][index]= ref_score;
          }
          if(score > ref_score){
              score= ref_score;
              best_ref= ref;
              mx= ref_mx;
              my= ref_my;
          }
      }
      //FIXME if mb_cmp != SSE then intra cannot be compared currently and mb_penalty vs. lambda2
  
    //  subpel search
      base_bits= get_rac_count(&s->c) - 8*(s->c.bytestream - s->c.bytestream_start);
      pc= s->c;
      pc.bytestream_start=
      pc.bytestream= p_buffer; //FIXME end/start? and at the other stoo
      memcpy(p_state, s->block_state, sizeof(s->block_state));
  
      if(level!=s->block_max_depth)
          put_rac(&pc, &p_state[4 + s_context], 1);
      put_rac(&pc, &p_state[1 + left->type + top->type], 0);
      if(s->ref_frames > 1)
          put_symbol(&pc, &p_state[128 + 1024 + 32*ref_context], best_ref, 0);
      pred_mv(s, &pmx, &pmy, best_ref, left, top, tr);
      put_symbol(&pc, &p_state[128 + 32*(mx_context + 16*!!best_ref)], mx - pmx, 1);
      put_symbol(&pc, &p_state[128 + 32*(my_context + 16*!!best_ref)], my - pmy, 1);
      p_len= pc.bytestream - pc.bytestream_start;
      score += (s->lambda2*(get_rac_count(&pc)-base_bits))>>FF_LAMBDA_SHIFT;
  
      block_s= block_w*block_w;
      sum = pix_sum(current_data[0], stride, block_w, block_w);
      l= (sum + block_s/2)/block_s;
      iscore = pix_norm1(current_data[0], stride, block_w) - 2*l*sum + l*l*block_s;
  
      if (s->nb_planes > 2) {
          block_s= block_w*block_w>>(s->chroma_h_shift + s->chroma_v_shift);
          sum = pix_sum(current_data[1], uvstride, block_w>>s->chroma_h_shift, block_w>>s->chroma_v_shift);
          cb= (sum + block_s/2)/block_s;
      //    iscore += pix_norm1(&current_mb[1][0], uvstride, block_w>>1) - 2*cb*sum + cb*cb*block_s;
          sum = pix_sum(current_data[2], uvstride, block_w>>s->chroma_h_shift, block_w>>s->chroma_v_shift);
          cr= (sum + block_s/2)/block_s;
      //    iscore += pix_norm1(&current_mb[2][0], uvstride, block_w>>1) - 2*cr*sum + cr*cr*block_s;
      }else
          cb = cr = 0;
  
      ic= s->c;
      ic.bytestream_start=
      ic.bytestream= i_buffer; //FIXME end/start? and at the other stoo
      memcpy(i_state, s->block_state, sizeof(s->block_state));
      if(level!=s->block_max_depth)
          put_rac(&ic, &i_state[4 + s_context], 1);
      put_rac(&ic, &i_state[1 + left->type + top->type], 1);
      put_symbol(&ic, &i_state[32],  l-pl , 1);
      if (s->nb_planes > 2) {
          put_symbol(&ic, &i_state[64], cb-pcb, 1);
          put_symbol(&ic, &i_state[96], cr-pcr, 1);
      }
      i_len= ic.bytestream - ic.bytestream_start;
      iscore += (s->lambda2*(get_rac_count(&ic)-base_bits))>>FF_LAMBDA_SHIFT;
  
      av_assert1(iscore < 255*255*256 + s->lambda2*10);
      av_assert1(iscore >= 0);
      av_assert1(l>=0 && l<=255);
      av_assert1(pl>=0 && pl<=255);
  
      if(level==0){
          int varc= iscore >> 8;
          int vard= score >> 8;
          if (vard <= 64 || vard < varc)
              c->scene_change_score+= ff_sqrt(vard) - ff_sqrt(varc);
          else
              c->scene_change_score+= s->m.qscale;
      }
  
      if(level!=s->block_max_depth){
          put_rac(&s->c, &s->block_state[4 + s_context], 0);
          score2 = encode_q_branch(s, level+1, 2*x+0, 2*y+0);
          score2+= encode_q_branch(s, level+1, 2*x+1, 2*y+0);
          score2+= encode_q_branch(s, level+1, 2*x+0, 2*y+1);
          score2+= encode_q_branch(s, level+1, 2*x+1, 2*y+1);
          score2+= s->lambda2>>FF_LAMBDA_SHIFT; //FIXME exact split overhead
  
          if(score2 < score && score2 < iscore)
              return score2;
      }
  
      if(iscore < score){
          pred_mv(s, &pmx, &pmy, 0, left, top, tr);
          memcpy(pbbak, i_buffer, i_len);
          s->c= ic;
          s->c.bytestream_start= pbbak_start;
          s->c.bytestream= pbbak + i_len;
          set_blocks(s, level, x, y, l, cb, cr, pmx, pmy, 0, BLOCK_INTRA);
          memcpy(s->block_state, i_state, sizeof(s->block_state));
          return iscore;
      }else{
          memcpy(pbbak, p_buffer, p_len);
          s->c= pc;
          s->c.bytestream_start= pbbak_start;
          s->c.bytestream= pbbak + p_len;
          set_blocks(s, level, x, y, pl, pcb, pcr, mx, my, best_ref, 0);
          memcpy(s->block_state, p_state, sizeof(s->block_state));
          return score;
      }
  }
  
  static void encode_q_branch2(SnowContext *s, int level, int x, int y){
      const int w= s->b_width  << s->block_max_depth;
      const int rem_depth= s->block_max_depth - level;
      const int index= (x + y*w) << rem_depth;
      int trx= (x+1)<<rem_depth;
      BlockNode *b= &s->block[index];
      const BlockNode *left  = x ? &s->block[index-1] : &null_block;
      const BlockNode *top   = y ? &s->block[index-w] : &null_block;
      const BlockNode *tl    = y && x ? &s->block[index-w-1] : left;
      const BlockNode *tr    = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
      int pl = left->color[0];
      int pcb= left->color[1];
      int pcr= left->color[2];
      int pmx, pmy;
      int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
      int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 16*!!b->ref;
      int my_context= av_log2(2*FFABS(left->my - top->my)) + 16*!!b->ref;
      int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
  
      if(s->keyframe){
          set_blocks(s, level, x, y, pl, pcb, pcr, 0, 0, 0, BLOCK_INTRA);
          return;
      }
  
      if(level!=s->block_max_depth){
          if(same_block(b,b+1) && same_block(b,b+w) && same_block(b,b+w+1)){
              put_rac(&s->c, &s->block_state[4 + s_context], 1);
          }else{
              put_rac(&s->c, &s->block_state[4 + s_context], 0);
              encode_q_branch2(s, level+1, 2*x+0, 2*y+0);
              encode_q_branch2(s, level+1, 2*x+1, 2*y+0);
              encode_q_branch2(s, level+1, 2*x+0, 2*y+1);
              encode_q_branch2(s, level+1, 2*x+1, 2*y+1);
              return;
          }
      }
      if(b->type & BLOCK_INTRA){
          pred_mv(s, &pmx, &pmy, 0, left, top, tr);
          put_rac(&s->c, &s->block_state[1 + (left->type&1) + (top->type&1)], 1);
          put_symbol(&s->c, &s->block_state[32], b->color[0]-pl , 1);
          if (s->nb_planes > 2) {
              put_symbol(&s->c, &s->block_state[64], b->color[1]-pcb, 1);
              put_symbol(&s->c, &s->block_state[96], b->color[2]-pcr, 1);
          }
          set_blocks(s, level, x, y, b->color[0], b->color[1], b->color[2], pmx, pmy, 0, BLOCK_INTRA);
      }else{
          pred_mv(s, &pmx, &pmy, b->ref, left, top, tr);
          put_rac(&s->c, &s->block_state[1 + (left->type&1) + (top->type&1)], 0);
          if(s->ref_frames > 1)
              put_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], b->ref, 0);
          put_symbol(&s->c, &s->block_state[128 + 32*mx_context], b->mx - pmx, 1);
          put_symbol(&s->c, &s->block_state[128 + 32*my_context], b->my - pmy, 1);
          set_blocks(s, level, x, y, pl, pcb, pcr, b->mx, b->my, b->ref, 0);
      }
  }
  
  static int get_dc(SnowContext *s, int mb_x, int mb_y, int plane_index){
      int i, x2, y2;
      Plane *p= &s->plane[plane_index];
      const int block_size = MB_SIZE >> s->block_max_depth;
      const int block_w    = plane_index ? block_size>>s->chroma_h_shift : block_size;
      const int block_h    = plane_index ? block_size>>s->chroma_v_shift : block_size;
      const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];
      const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
      const int ref_stride= s->current_picture->linesize[plane_index];
      uint8_t *src= s-> input_picture->data[plane_index];
      IDWTELEM *dst= (IDWTELEM*)s->m.sc.obmc_scratchpad + plane_index*block_size*block_size*4; //FIXME change to unsigned
      const int b_stride = s->b_width << s->block_max_depth;
      const int w= p->width;
      const int h= p->height;
      int index= mb_x + mb_y*b_stride;
      BlockNode *b= &s->block[index];
      BlockNode backup= *b;
      int ab=0;
      int aa=0;
  
      av_assert2(s->chroma_h_shift == s->chroma_v_shift); //obmc stuff above
  
      b->type|= BLOCK_INTRA;
      b->color[plane_index]= 0;
      memset(dst, 0, obmc_stride*obmc_stride*sizeof(IDWTELEM));
  
      for(i=0; i<4; i++){
          int mb_x2= mb_x + (i &1) - 1;
          int mb_y2= mb_y + (i>>1) - 1;
          int x= block_w*mb_x2 + block_w/2;
          int y= block_h*mb_y2 + block_h/2;
  
          add_yblock(s, 0, NULL, dst + (i&1)*block_w + (i>>1)*obmc_stride*block_h, NULL, obmc,
                      x, y, block_w, block_h, w, h, obmc_stride, ref_stride, obmc_stride, mb_x2, mb_y2, 0, 0, plane_index);
  
          for(y2= FFMAX(y, 0); y2<FFMIN(h, y+block_h); y2++){
              for(x2= FFMAX(x, 0); x2<FFMIN(w, x+block_w); x2++){
                  int index= x2-(block_w*mb_x - block_w/2) + (y2-(block_h*mb_y - block_h/2))*obmc_stride;
                  int obmc_v= obmc[index];
                  int d;
                  if(y<0) obmc_v += obmc[index + block_h*obmc_stride];
                  if(x<0) obmc_v += obmc[index + block_w];
                  if(y+block_h>h) obmc_v += obmc[index - block_h*obmc_stride];
                  if(x+block_w>w) obmc_v += obmc[index - block_w];
                  //FIXME precalculate this or simplify it somehow else
  
                  d = -dst[index] + (1<<(FRAC_BITS-1));
                  dst[index] = d;
                  ab += (src[x2 + y2*ref_stride] - (d>>FRAC_BITS)) * obmc_v;
                  aa += obmc_v * obmc_v; //FIXME precalculate this
              }
          }
      }
      *b= backup;
  
      return av_clip_uint8( ROUNDED_DIV(ab<<LOG2_OBMC_MAX, aa) ); //FIXME we should not need clipping
  }
  
  static inline int get_block_bits(SnowContext *s, int x, int y, int w){
      const int b_stride = s->b_width << s->block_max_depth;
      const int b_height = s->b_height<< s->block_max_depth;
      int index= x + y*b_stride;
      const BlockNode *b     = &s->block[index];
      const BlockNode *left  = x ? &s->block[index-1] : &null_block;
      const BlockNode *top   = y ? &s->block[index-b_stride] : &null_block;
      const BlockNode *tl    = y && x ? &s->block[index-b_stride-1] : left;
      const BlockNode *tr    = y && x+w<b_stride ? &s->block[index-b_stride+w] : tl;
      int dmx, dmy;
  //  int mx_context= av_log2(2*FFABS(left->mx - top->mx));
  //  int my_context= av_log2(2*FFABS(left->my - top->my));
  
      if(x<0 || x>=b_stride || y>=b_height)
          return 0;
  /*
  1            0      0
  01X          1-2    1
  001XX        3-6    2-3
  0001XXX      7-14   4-7
  00001XXXX   15-30   8-15
  */
  //FIXME try accurate rate
  //FIXME intra and inter predictors if surrounding blocks are not the same type
      if(b->type & BLOCK_INTRA){
          return 3+2*( av_log2(2*FFABS(left->color[0] - b->color[0]))
                     + av_log2(2*FFABS(left->color[1] - b->color[1]))
                     + av_log2(2*FFABS(left->color[2] - b->color[2])));
      }else{
          pred_mv(s, &dmx, &dmy, b->ref, left, top, tr);
          dmx-= b->mx;
          dmy-= b->my;
          return 2*(1 + av_log2(2*FFABS(dmx)) //FIXME kill the 2* can be merged in lambda
                      + av_log2(2*FFABS(dmy))
                      + av_log2(2*b->ref));
      }
  }
  
  static int get_block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index, uint8_t (*obmc_edged)[MB_SIZE * 2]){
      Plane *p= &s->plane[plane_index];
      const int block_size = MB_SIZE >> s->block_max_depth;
      const int block_w    = plane_index ? block_size>>s->chroma_h_shift : block_size;
      const int block_h    = plane_index ? block_size>>s->chroma_v_shift : block_size;
      const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
      const int ref_stride= s->current_picture->linesize[plane_index];
      uint8_t *dst= s->current_picture->data[plane_index];
      uint8_t *src= s->  input_picture->data[plane_index];
      IDWTELEM *pred= (IDWTELEM*)s->m.sc.obmc_scratchpad + plane_index*block_size*block_size*4;
      uint8_t *cur = s->scratchbuf;
      uint8_t *tmp = s->emu_edge_buffer;
      const int b_stride = s->b_width << s->block_max_depth;
      const int b_height = s->b_height<< s->block_max_depth;
      const int w= p->width;
      const int h= p->height;
      int distortion;
      int rate= 0;
      const int penalty_factor= get_penalty_factor(s->lambda, s->lambda2, s->avctx->me_cmp);
      int sx= block_w*mb_x - block_w/2;
      int sy= block_h*mb_y - block_h/2;
      int x0= FFMAX(0,-sx);
      int y0= FFMAX(0,-sy);
      int x1= FFMIN(block_w*2, w-sx);
      int y1= FFMIN(block_h*2, h-sy);
      int i,x,y;
  
      av_assert2(s->chroma_h_shift == s->chroma_v_shift); //obmc and square assumtions below chckinhg only block_w
  
      ff_snow_pred_block(s, cur, tmp, ref_stride, sx, sy, block_w*2, block_h*2, &s->block[mb_x + mb_y*b_stride], plane_index, w, h);
  
      for(y=y0; y<y1; y++){
          const uint8_t *obmc1= obmc_edged[y];
          const IDWTELEM *pred1 = pred + y*obmc_stride;
          uint8_t *cur1 = cur + y*ref_stride;
          uint8_t *dst1 = dst + sx + (sy+y)*ref_stride;
          for(x=x0; x<x1; x++){
  #if FRAC_BITS >= LOG2_OBMC_MAX
              int v = (cur1[x] * obmc1[x]) << (FRAC_BITS - LOG2_OBMC_MAX);
  #else
              int v = (cur1[x] * obmc1[x] + (1<<(LOG2_OBMC_MAX - FRAC_BITS-1))) >> (LOG2_OBMC_MAX - FRAC_BITS);
  #endif
              v = (v + pred1[x]) >> FRAC_BITS;
              if(v&(~255)) v= ~(v>>31);
              dst1[x] = v;
          }
      }
  
      /* copy the regions where obmc[] = (uint8_t)256 */
      if(LOG2_OBMC_MAX == 8
          && (mb_x == 0 || mb_x == b_stride-1)
          && (mb_y == 0 || mb_y == b_height-1)){
          if(mb_x == 0)
              x1 = block_w;
          else
              x0 = block_w;
          if(mb_y == 0)
              y1 = block_h;
          else
              y0 = block_h;
          for(y=y0; y<y1; y++)
              memcpy(dst + sx+x0 + (sy+y)*ref_stride, cur + x0 + y*ref_stride, x1-x0);
      }
  
      if(block_w==16){
          /* FIXME rearrange dsputil to fit 32x32 cmp functions */
          /* FIXME check alignment of the cmp wavelet vs the encoding wavelet */
          /* FIXME cmps overlap but do not cover the wavelet's whole support.
           * So improving the score of one block is not strictly guaranteed
           * to improve the score of the whole frame, thus iterative motion
           * estimation does not always converge. */
          if(s->avctx->me_cmp == FF_CMP_W97)
              distortion = ff_w97_32_c(&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, 32);
          else if(s->avctx->me_cmp == FF_CMP_W53)
              distortion = ff_w53_32_c(&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, 32);
          else{
              distortion = 0;
              for(i=0; i<4; i++){
                  int off = sx+16*(i&1) + (sy+16*(i>>1))*ref_stride;
                  distortion += s->mecc.me_cmp[0](&s->m, src + off, dst + off, ref_stride, 16);
              }
          }
      }else{
          av_assert2(block_w==8);
          distortion = s->mecc.me_cmp[0](&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, block_w*2);
      }
  
      if(plane_index==0){
          for(i=0; i<4; i++){
  /* ..RRr
   * .RXx.
   * rxx..
   */
              rate += get_block_bits(s, mb_x + (i&1) - (i>>1), mb_y + (i>>1), 1);
          }
          if(mb_x == b_stride-2)
              rate += get_block_bits(s, mb_x + 1, mb_y + 1, 1);
      }
      return distortion + rate*penalty_factor;
  }
  
  static int get_4block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index){
      int i, y2;
      Plane *p= &s->plane[plane_index];
      const int block_size = MB_SIZE >> s->block_max_depth;
      const int block_w    = plane_index ? block_size>>s->chroma_h_shift : block_size;
      const int block_h    = plane_index ? block_size>>s->chroma_v_shift : block_size;
      const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];
      const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
      const int ref_stride= s->current_picture->linesize[plane_index];
      uint8_t *dst= s->current_picture->data[plane_index];
      uint8_t *src= s-> input_picture->data[plane_index];
      //FIXME zero_dst is const but add_yblock changes dst if add is 0 (this is never the case for dst=zero_dst
      // const has only been removed from zero_dst to suppress a warning
      static IDWTELEM zero_dst[4096]; //FIXME
      const int b_stride = s->b_width << s->block_max_depth;
      const int w= p->width;
      const int h= p->height;
      int distortion= 0;
      int rate= 0;
      const int penalty_factor= get_penalty_factor(s->lambda, s->lambda2, s->avctx->me_cmp);
  
      av_assert2(s->chroma_h_shift == s->chroma_v_shift); //obmc and square assumtions below
  
      for(i=0; i<9; i++){
          int mb_x2= mb_x + (i%3) - 1;
          int mb_y2= mb_y + (i/3) - 1;
          int x= block_w*mb_x2 + block_w/2;
          int y= block_h*mb_y2 + block_h/2;
  
          add_yblock(s, 0, NULL, zero_dst, dst, obmc,
                     x, y, block_w, block_h, w, h, /*dst_stride*/0, ref_stride, obmc_stride, mb_x2, mb_y2, 1, 1, plane_index);
  
          //FIXME find a cleaner/simpler way to skip the outside stuff
          for(y2= y; y2<0; y2++)
              memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, block_w);
          for(y2= h; y2<y+block_h; y2++)
              memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, block_w);
          if(x<0){
              for(y2= y; y2<y+block_h; y2++)
                  memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, -x);
          }
          if(x+block_w > w){
              for(y2= y; y2<y+block_h; y2++)
                  memcpy(dst + w + y2*ref_stride, src + w + y2*ref_stride, x+block_w - w);
          }
  
          av_assert1(block_w== 8 || block_w==16);
          distortion += s->mecc.me_cmp[block_w==8](&s->m, src + x + y*ref_stride, dst + x + y*ref_stride, ref_stride, block_h);
      }
  
      if(plane_index==0){
          BlockNode *b= &s->block[mb_x+mb_y*b_stride];
          int merged= same_block(b,b+1) && same_block(b,b+b_stride) && same_block(b,b+b_stride+1);
  
  /* ..RRRr
   * .RXXx.
   * .RXXx.
   * rxxx.
   */
          if(merged)
              rate = get_block_bits(s, mb_x, mb_y, 2);
          for(i=merged?4:0; i<9; i++){
              static const int dxy[9][2] = {{0,0},{1,0},{0,1},{1,1},{2,0},{2,1},{-1,2},{0,2},{1,2}};
              rate += get_block_bits(s, mb_x + dxy[i][0], mb_y + dxy[i][1], 1);
          }
      }
      return distortion + rate*penalty_factor;
  }
  
  static int encode_subband_c0run(SnowContext *s, SubBand *b, const IDWTELEM *src, const IDWTELEM *parent, int stride, int orientation){
      const int w= b->width;
      const int h= b->height;
      int x, y;
  
      if(1){
          int run=0;
          int *runs = s->run_buffer;
          int run_index=0;
          int max_index;
  
          for(y=0; y<h; y++){
              for(x=0; x<w; x++){
                  int v, p=0;
                  int /*ll=0, */l=0, lt=0, t=0, rt=0;
                  v= src[x + y*stride];
  
                  if(y){
                      t= src[x + (y-1)*stride];
                      if(x){
                          lt= src[x - 1 + (y-1)*stride];
                      }
                      if(x + 1 < w){
                          rt= src[x + 1 + (y-1)*stride];
                      }
                  }
                  if(x){
                      l= src[x - 1 + y*stride];
                      /*if(x > 1){
                          if(orientation==1) ll= src[y + (x-2)*stride];
                          else               ll= src[x - 2 + y*stride];
                      }*/
                  }
                  if(parent){
                      int px= x>>1;
                      int py= y>>1;
                      if(px<b->parent->width && py<b->parent->height)
                          p= parent[px + py*2*stride];
                  }
                  if(!(/*ll|*/l|lt|t|rt|p)){
                      if(v){
                          runs[run_index++]= run;
                          run=0;
                      }else{
                          run++;
                      }
                  }
              }
          }
          max_index= run_index;
          runs[run_index++]= run;
          run_index=0;
          run= runs[run_index++];
  
          put_symbol2(&s->c, b->state[30], max_index, 0);
          if(run_index <= max_index)
              put_symbol2(&s->c, b->state[1], run, 3);
  
          for(y=0; y<h; y++){
              if(s->c.bytestream_end - s->c.bytestream < w*40){
                  av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
                  return AVERROR(ENOMEM);
              }
              for(x=0; x<w; x++){
                  int v, p=0;
                  int /*ll=0, */l=0, lt=0, t=0, rt=0;
                  v= src[x + y*stride];
  
                  if(y){
                      t= src[x + (y-1)*stride];
                      if(x){
                          lt= src[x - 1 + (y-1)*stride];
                      }
                      if(x + 1 < w){
                          rt= src[x + 1 + (y-1)*stride];
                      }
                  }
                  if(x){
                      l= src[x - 1 + y*stride];
                      /*if(x > 1){
                          if(orientation==1) ll= src[y + (x-2)*stride];
                          else               ll= src[x - 2 + y*stride];
                      }*/
                  }
                  if(parent){
                      int px= x>>1;
                      int py= y>>1;
                      if(px<b->parent->width && py<b->parent->height)
                          p= parent[px + py*2*stride];
                  }
                  if(/*ll|*/l|lt|t|rt|p){
                      int context= av_log2(/*FFABS(ll) + */3*FFABS(l) + FFABS(lt) + 2*FFABS(t) + FFABS(rt) + FFABS(p));
  
                      put_rac(&s->c, &b->state[0][context], !!v);
                  }else{
                      if(!run){
                          run= runs[run_index++];
  
                          if(run_index <= max_index)
                              put_symbol2(&s->c, b->state[1], run, 3);
                          av_assert2(v);
                      }else{
                          run--;
                          av_assert2(!v);
                      }
                  }
                  if(v){
                      int context= av_log2(/*FFABS(ll) + */3*FFABS(l) + FFABS(lt) + 2*FFABS(t) + FFABS(rt) + FFABS(p));
                      int l2= 2*FFABS(l) + (l<0);
                      int t2= 2*FFABS(t) + (t<0);
  
                      put_symbol2(&s->c, b->state[context + 2], FFABS(v)-1, context-4);
                      put_rac(&s->c, &b->state[0][16 + 1 + 3 + ff_quant3bA[l2&0xFF] + 3*ff_quant3bA[t2&0xFF]], v<0);
                  }
              }
          }
      }
      return 0;
  }
  
  static int encode_subband(SnowContext *s, SubBand *b, const IDWTELEM *src, const IDWTELEM *parent, int stride, int orientation){
  //    encode_subband_qtree(s, b, src, parent, stride, orientation);
  //    encode_subband_z0run(s, b, src, parent, stride, orientation);
      return encode_subband_c0run(s, b, src, parent, stride, orientation);
  //    encode_subband_dzr(s, b, src, parent, stride, orientation);
  }
  
  static av_always_inline int check_block(SnowContext *s, int mb_x, int mb_y, int p[3], int intra, uint8_t (*obmc_edged)[MB_SIZE * 2], int *best_rd){
      const int b_stride= s->b_width << s->block_max_depth;
      BlockNode *block= &s->block[mb_x + mb_y * b_stride];
      BlockNode backup= *block;
      unsigned value;
      int rd, index;
  
      av_assert2(mb_x>=0 && mb_y>=0);
      av_assert2(mb_x<b_stride);
  
      if(intra){
          block->color[0] = p[0];
          block->color[1] = p[1];
          block->color[2] = p[2];
          block->type |= BLOCK_INTRA;
      }else{
          index= (p[0] + 31*p[1]) & (ME_CACHE_SIZE-1);
          value= s->me_cache_generation + (p[0]>>10) + (p[1]<<6) + (block->ref<<12);
          if(s->me_cache[index] == value)
              return 0;
          s->me_cache[index]= value;
  
          block->mx= p[0];
          block->my= p[1];
          block->type &= ~BLOCK_INTRA;
      }
  
      rd= get_block_rd(s, mb_x, mb_y, 0, obmc_edged) + s->intra_penalty * !!intra;
  
  //FIXME chroma
      if(rd < *best_rd){
          *best_rd= rd;
          return 1;
      }else{
          *block= backup;
          return 0;
      }
  }
  
  /* special case for int[2] args we discard afterwards,
   * fixes compilation problem with gcc 2.95 */
  static av_always_inline int check_block_inter(SnowContext *s, int mb_x, int mb_y, int p0, int p1, uint8_t (*obmc_edged)[MB_SIZE * 2], int *best_rd){
      int p[2] = {p0, p1};
      return check_block(s, mb_x, mb_y, p, 0, obmc_edged, best_rd);
  }
  
  static av_always_inline int check_4block_inter(SnowContext *s, int mb_x, int mb_y, int p0, int p1, int ref, int *best_rd){
      const int b_stride= s->b_width << s->block_max_depth;
      BlockNode *block= &s->block[mb_x + mb_y * b_stride];
      BlockNode backup[4];
      unsigned value;
      int rd, index;
  
      /* We don't initialize backup[] during variable declaration, because
       * that fails to compile on MSVC: "cannot convert from 'BlockNode' to
       * 'int16_t'". */
      backup[0] = block[0];
      backup[1] = block[1];
      backup[2] = block[b_stride];
      backup[3] = block[b_stride + 1];
  
      av_assert2(mb_x>=0 && mb_y>=0);
      av_assert2(mb_x<b_stride);
      av_assert2(((mb_x|mb_y)&1) == 0);
  
      index= (p0 + 31*p1) & (ME_CACHE_SIZE-1);
      value= s->me_cache_generation + (p0>>10) + (p1<<6) + (block->ref<<12);
      if(s->me_cache[index] == value)
          return 0;
      s->me_cache[index]= value;
  
      block->mx= p0;
      block->my= p1;
      block->ref= ref;
      block->type &= ~BLOCK_INTRA;
      block[1]= block[b_stride]= block[b_stride+1]= *block;
  
      rd= get_4block_rd(s, mb_x, mb_y, 0);
  
  //FIXME chroma
      if(rd < *best_rd){
          *best_rd= rd;
          return 1;
      }else{
          block[0]= backup[0];
          block[1]= backup[1];
          block[b_stride]= backup[2];
          block[b_stride+1]= backup[3];
          return 0;
      }
  }
  
  static void iterative_me(SnowContext *s){
      int pass, mb_x, mb_y;
      const int b_width = s->b_width  << s->block_max_depth;
      const int b_height= s->b_height << s->block_max_depth;
      const int b_stride= b_width;
      int color[3];
  
      {
          RangeCoder r = s->c;
          uint8_t state[sizeof(s->block_state)];
          memcpy(state, s->block_state, sizeof(s->block_state));
          for(mb_y= 0; mb_y<s->b_height; mb_y++)
              for(mb_x= 0; mb_x<s->b_width; mb_x++)
                  encode_q_branch(s, 0, mb_x, mb_y);
          s->c = r;
          memcpy(s->block_state, state, sizeof(s->block_state));
      }
  
      for(pass=0; pass<25; pass++){
          int change= 0;
  
          for(mb_y= 0; mb_y<b_height; mb_y++){
              for(mb_x= 0; mb_x<b_width; mb_x++){
                  int dia_change, i, j, ref;
                  int best_rd= INT_MAX, ref_rd;
                  BlockNode backup, ref_b;
                  const int index= mb_x + mb_y * b_stride;
                  BlockNode *block= &s->block[index];
                  BlockNode *tb =                   mb_y            ? &s->block[index-b_stride  ] : NULL;
                  BlockNode *lb = mb_x                              ? &s->block[index         -1] : NULL;
                  BlockNode *rb = mb_x+1<b_width                    ? &s->block[index         +1] : NULL;
                  BlockNode *bb =                   mb_y+1<b_height ? &s->block[index+b_stride  ] : NULL;
                  BlockNode *tlb= mb_x           && mb_y            ? &s->block[index-b_stride-1] : NULL;
                  BlockNode *trb= mb_x+1<b_width && mb_y            ? &s->block[index-b_stride+1] : NULL;
                  BlockNode *blb= mb_x           && mb_y+1<b_height ? &s->block[index+b_stride-1] : NULL;
                  BlockNode *brb= mb_x+1<b_width && mb_y+1<b_height ? &s->block[index+b_stride+1] : NULL;
                  const int b_w= (MB_SIZE >> s->block_max_depth);
                  uint8_t obmc_edged[MB_SIZE * 2][MB_SIZE * 2];
  
                  if(pass && (block->type & BLOCK_OPT))
                      continue;
                  block->type |= BLOCK_OPT;
  
                  backup= *block;
  
                  if(!s->me_cache_generation)
                      memset(s->me_cache, 0, sizeof(s->me_cache));
                  s->me_cache_generation += 1<<22;
  
                  //FIXME precalculate
                  {
                      int x, y;
                      for (y = 0; y < b_w * 2; y++)
                          memcpy(obmc_edged[y], ff_obmc_tab[s->block_max_depth] + y * b_w * 2, b_w * 2);
                      if(mb_x==0)
                          for(y=0; y<b_w*2; y++)
                              memset(obmc_edged[y], obmc_edged[y][0] + obmc_edged[y][b_w-1], b_w);
                      if(mb_x==b_stride-1)
                          for(y=0; y<b_w*2; y++)
                              memset(obmc_edged[y]+b_w, obmc_edged[y][b_w] + obmc_edged[y][b_w*2-1], b_w);
                      if(mb_y==0){
                          for(x=0; x<b_w*2; x++)
                              obmc_edged[0][x] += obmc_edged[b_w-1][x];
                          for(y=1; y<b_w; y++)
                              memcpy(obmc_edged[y], obmc_edged[0], b_w*2);
                      }
                      if(mb_y==b_height-1){
                          for(x=0; x<b_w*2; x++)
                              obmc_edged[b_w*2-1][x] += obmc_edged[b_w][x];
                          for(y=b_w; y<b_w*2-1; y++)
                              memcpy(obmc_edged[y], obmc_edged[b_w*2-1], b_w*2);
                      }
                  }
  
                  //skip stuff outside the picture
                  if(mb_x==0 || mb_y==0 || mb_x==b_width-1 || mb_y==b_height-1){
                      uint8_t *src= s->  input_picture->data[0];
                      uint8_t *dst= s->current_picture->data[0];
                      const int stride= s->current_picture->linesize[0];
                      const int block_w= MB_SIZE >> s->block_max_depth;
                      const int block_h= MB_SIZE >> s->block_max_depth;
                      const int sx= block_w*mb_x - block_w/2;
                      const int sy= block_h*mb_y - block_h/2;
                      const int w= s->plane[0].width;
                      const int h= s->plane[0].height;
                      int y;
  
                      for(y=sy; y<0; y++)
                          memcpy(dst + sx + y*stride, src + sx + y*stride, block_w*2);
                      for(y=h; y<sy+block_h*2; y++)
                          memcpy(dst + sx + y*stride, src + sx + y*stride, block_w*2);
                      if(sx<0){
                          for(y=sy; y<sy+block_h*2; y++)
                              memcpy(dst + sx + y*stride, src + sx + y*stride, -sx);
                      }
                      if(sx+block_w*2 > w){
                          for(y=sy; y<sy+block_h*2; y++)
                              memcpy(dst + w + y*stride, src + w + y*stride, sx+block_w*2 - w);
                      }
                  }
  
                  // intra(black) = neighbors' contribution to the current block
                  for(i=0; i < s->nb_planes; i++)
                      color[i]= get_dc(s, mb_x, mb_y, i);
  
                  // get previous score (cannot be cached due to OBMC)
                  if(pass > 0 && (block->type&BLOCK_INTRA)){
                      int color0[3]= {block->color[0], block->color[1], block->color[2]};
                      check_block(s, mb_x, mb_y, color0, 1, obmc_edged, &best_rd);
                  }else
                      check_block_inter(s, mb_x, mb_y, block->mx, block->my, obmc_edged, &best_rd);
  
                  ref_b= *block;
                  ref_rd= best_rd;
                  for(ref=0; ref < s->ref_frames; ref++){
                      int16_t (*mvr)[2]= &s->ref_mvs[ref][index];
                      if(s->ref_scores[ref][index] > s->ref_scores[ref_b.ref][index]*3/2) //FIXME tune threshold
                          continue;
                      block->ref= ref;
                      best_rd= INT_MAX;
  
                      check_block_inter(s, mb_x, mb_y, mvr[0][0], mvr[0][1], obmc_edged, &best_rd);
                      check_block_inter(s, mb_x, mb_y, 0, 0, obmc_edged, &best_rd);
                      if(tb)
                          check_block_inter(s, mb_x, mb_y, mvr[-b_stride][0], mvr[-b_stride][1], obmc_edged, &best_rd);
                      if(lb)
                          check_block_inter(s, mb_x, mb_y, mvr[-1][0], mvr[-1][1], obmc_edged, &best_rd);
                      if(rb)
                          check_block_inter(s, mb_x, mb_y, mvr[1][0], mvr[1][1], obmc_edged, &best_rd);
                      if(bb)
                          check_block_inter(s, mb_x, mb_y, mvr[b_stride][0], mvr[b_stride][1], obmc_edged, &best_rd);
  
                      /* fullpel ME */
                      //FIXME avoid subpel interpolation / round to nearest integer
                      do{
                          int newx = block->mx;
                          int newy = block->my;
                          int dia_size = s->iterative_dia_size ? s->iterative_dia_size : FFMAX(s->avctx->dia_size, 1);
                          dia_change=0;
                          for(i=0; i < dia_size; i++){
                              for(j=0; j<i; j++){
                                  dia_change |= check_block_inter(s, mb_x, mb_y, newx+4*(i-j), newy+(4*j), obmc_edged, &best_rd);
                                  dia_change |= check_block_inter(s, mb_x, mb_y, newx-4*(i-j), newy-(4*j), obmc_edged, &best_rd);
                                  dia_change |= check_block_inter(s, mb_x, mb_y, newx-(4*j), newy+4*(i-j), obmc_edged, &best_rd);
                                  dia_change |= check_block_inter(s, mb_x, mb_y, newx+(4*j), newy-4*(i-j), obmc_edged, &best_rd);
                              }
                          }
                      }while(dia_change);
                      /* subpel ME */
                      do{
                          static const int square[8][2]= {{+1, 0},{-1, 0},{ 0,+1},{ 0,-1},{+1,+1},{-1,-1},{+1,-1},{-1,+1},};
                          dia_change=0;
                          for(i=0; i<8; i++)
                              dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+square[i][0], block->my+square[i][1], obmc_edged, &best_rd);
                      }while(dia_change);
                      //FIXME or try the standard 2 pass qpel or similar
  
                      mvr[0][0]= block->mx;
                      mvr[0][1]= block->my;
                      if(ref_rd > best_rd){
                          ref_rd= best_rd;
                          ref_b= *block;
                      }
                  }
                  best_rd= ref_rd;
                  *block= ref_b;
                  check_block(s, mb_x, mb_y, color, 1, obmc_edged, &best_rd);
                  //FIXME RD style color selection
                  if(!same_block(block, &backup)){
                      if(tb ) tb ->type &= ~BLOCK_OPT;
                      if(lb ) lb ->type &= ~BLOCK_OPT;
                      if(rb ) rb ->type &= ~BLOCK_OPT;
                      if(bb ) bb ->type &= ~BLOCK_OPT;
                      if(tlb) tlb->type &= ~BLOCK_OPT;
                      if(trb) trb->type &= ~BLOCK_OPT;
                      if(blb) blb->type &= ~BLOCK_OPT;
                      if(brb) brb->type &= ~BLOCK_OPT;
                      change ++;
                  }
              }
          }
          av_log(s->avctx, AV_LOG_DEBUG, "pass:%d changed:%d\n", pass, change);
          if(!change)
              break;
      }
  
      if(s->block_max_depth == 1){
          int change= 0;
          for(mb_y= 0; mb_y<b_height; mb_y+=2){
              for(mb_x= 0; mb_x<b_width; mb_x+=2){
                  int i;
                  int best_rd, init_rd;
                  const int index= mb_x + mb_y * b_stride;
                  BlockNode *b[4];
  
                  b[0]= &s->block[index];
                  b[1]= b[0]+1;
                  b[2]= b[0]+b_stride;
                  b[3]= b[2]+1;
                  if(same_block(b[0], b[1]) &&
                     same_block(b[0], b[2]) &&
                     same_block(b[0], b[3]))
                      continue;
  
                  if(!s->me_cache_generation)
                      memset(s->me_cache, 0, sizeof(s->me_cache));
                  s->me_cache_generation += 1<<22;
  
                  init_rd= best_rd= get_4block_rd(s, mb_x, mb_y, 0);
  
                  //FIXME more multiref search?
                  check_4block_inter(s, mb_x, mb_y,
                                     (b[0]->mx + b[1]->mx + b[2]->mx + b[3]->mx + 2) >> 2,
                                     (b[0]->my + b[1]->my + b[2]->my + b[3]->my + 2) >> 2, 0, &best_rd);
  
                  for(i=0; i<4; i++)
                      if(!(b[i]->type&BLOCK_INTRA))
                          check_4block_inter(s, mb_x, mb_y, b[i]->mx, b[i]->my, b[i]->ref, &best_rd);
  
                  if(init_rd != best_rd)
                      change++;
              }
          }
          av_log(s->avctx, AV_LOG_ERROR, "pass:4mv changed:%d\n", change*4);
      }
  }
  
  static void encode_blocks(SnowContext *s, int search){
      int x, y;
      int w= s->b_width;
      int h= s->b_height;
  
      if(s->motion_est == FF_ME_ITER && !s->keyframe && search)
          iterative_me(s);
  
      for(y=0; y<h; y++){
          if(s->c.bytestream_end - s->c.bytestream < w*MB_SIZE*MB_SIZE*3){ //FIXME nicer limit
              av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
              return;
          }
          for(x=0; x<w; x++){
              if(s->motion_est == FF_ME_ITER || !search)
                  encode_q_branch2(s, 0, x, y);
              else
                  encode_q_branch (s, 0, x, y);
          }
      }
  }
  
  static void quantize(SnowContext *s, SubBand *b, IDWTELEM *dst, DWTELEM *src, int stride, int bias){
      const int w= b->width;
      const int h= b->height;
      const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
      const int qmul= ff_qexp[qlog&(QROOT-1)]<<((qlog>>QSHIFT) + ENCODER_EXTRA_BITS);
      int x,y, thres1, thres2;
  
      if(s->qlog == LOSSLESS_QLOG){
          for(y=0; y<h; y++)
              for(x=0; x<w; x++)
                  dst[x + y*stride]= src[x + y*stride];
          return;
      }
  
      bias= bias ? 0 : (3*qmul)>>3;
      thres1= ((qmul - bias)>>QEXPSHIFT) - 1;
      thres2= 2*thres1;
  
      if(!bias){
          for(y=0; y<h; y++){
              for(x=0; x<w; x++){
                  int i= src[x + y*stride];
  
                  if((unsigned)(i+thres1) > thres2){
                      if(i>=0){
                          i<<= QEXPSHIFT;
                          i/= qmul; //FIXME optimize
                          dst[x + y*stride]=  i;
                      }else{
                          i= -i;
                          i<<= QEXPSHIFT;
                          i/= qmul; //FIXME optimize
                          dst[x + y*stride]= -i;
                      }
                  }else
                      dst[x + y*stride]= 0;
              }
          }
      }else{
          for(y=0; y<h; y++){
              for(x=0; x<w; x++){
                  int i= src[x + y*stride];
  
                  if((unsigned)(i+thres1) > thres2){
                      if(i>=0){
                          i<<= QEXPSHIFT;
                          i= (i + bias) / qmul; //FIXME optimize
                          dst[x + y*stride]=  i;
                      }else{
                          i= -i;
                          i<<= QEXPSHIFT;
                          i= (i + bias) / qmul; //FIXME optimize
                          dst[x + y*stride]= -i;
                      }
                  }else
                      dst[x + y*stride]= 0;
              }
          }
      }
  }
  
  static void dequantize(SnowContext *s, SubBand *b, IDWTELEM *src, int stride){
      const int w= b->width;
      const int h= b->height;
      const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
      const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
      const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
      int x,y;
  
      if(s->qlog == LOSSLESS_QLOG) return;
  
      for(y=0; y<h; y++){
          for(x=0; x<w; x++){
              int i= src[x + y*stride];
              if(i<0){
                  src[x + y*stride]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
              }else if(i>0){
                  src[x + y*stride]=  (( i*qmul + qadd)>>(QEXPSHIFT));
              }
          }
      }
  }
  
  static void decorrelate(SnowContext *s, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median){
      const int w= b->width;
      const int h= b->height;
      int x,y;
  
      for(y=h-1; y>=0; y--){
          for(x=w-1; x>=0; x--){
              int i= x + y*stride;
  
              if(x){
                  if(use_median){
                      if(y && x+1<w) src[i] -= mid_pred(src[i - 1], src[i - stride], src[i - stride + 1]);
                      else  src[i] -= src[i - 1];
                  }else{
                      if(y) src[i] -= mid_pred(src[i - 1], src[i - stride], src[i - 1] + src[i - stride] - src[i - 1 - stride]);
                      else  src[i] -= src[i - 1];
                  }
              }else{
                  if(y) src[i] -= src[i - stride];
              }
          }
      }
  }
  
  static void correlate(SnowContext *s, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median){
      const int w= b->width;
      const int h= b->height;
      int x,y;
  
      for(y=0; y<h; y++){
          for(x=0; x<w; x++){
              int i= x + y*stride;
  
              if(x){
                  if(use_median){
                      if(y && x+1<w) src[i] += mid_pred(src[i - 1], src[i - stride], src[i - stride + 1]);
                      else  src[i] += src[i - 1];
                  }else{
                      if(y) src[i] += mid_pred(src[i - 1], src[i - stride], src[i - 1] + src[i - stride] - src[i - 1 - stride]);
                      else  src[i] += src[i - 1];
                  }
              }else{
                  if(y) src[i] += src[i - stride];
              }
          }
      }
  }
  
  static void encode_qlogs(SnowContext *s){
      int plane_index, level, orientation;
  
      for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){
          for(level=0; level<s->spatial_decomposition_count; level++){
              for(orientation=level ? 1:0; orientation<4; orientation++){
                  if(orientation==2) continue;
                  put_symbol(&s->c, s->header_state, s->plane[plane_index].band[level][orientation].qlog, 1);
              }
          }
      }
  }
  
  static void encode_header(SnowContext *s){
      int plane_index, i;
      uint8_t kstate[32];
  
      memset(kstate, MID_STATE, sizeof(kstate));
  
      put_rac(&s->c, kstate, s->keyframe);
      if(s->keyframe || s->always_reset){
          ff_snow_reset_contexts(s);
          s->last_spatial_decomposition_type=
          s->last_qlog=
          s->last_qbias=
          s->last_mv_scale=
          s->last_block_max_depth= 0;
          for(plane_index=0; plane_index<2; plane_index++){
              Plane *p= &s->plane[plane_index];
              p->last_htaps=0;
              p->last_diag_mc=0;
              memset(p->last_hcoeff, 0, sizeof(p->last_hcoeff));
          }
      }
      if(s->keyframe){
          put_symbol(&s->c, s->header_state, s->version, 0);
          put_rac(&s->c, s->header_state, s->always_reset);
          put_symbol(&s->c, s->header_state, s->temporal_decomposition_type, 0);
          put_symbol(&s->c, s->header_state, s->temporal_decomposition_count, 0);
          put_symbol(&s->c, s->header_state, s->spatial_decomposition_count, 0);
          put_symbol(&s->c, s->header_state, s->colorspace_type, 0);
          if (s->nb_planes > 2) {
              put_symbol(&s->c, s->header_state, s->chroma_h_shift, 0);
              put_symbol(&s->c, s->header_state, s->chroma_v_shift, 0);
          }
          put_rac(&s->c, s->header_state, s->spatial_scalability);
  //        put_rac(&s->c, s->header_state, s->rate_scalability);
          put_symbol(&s->c, s->header_state, s->max_ref_frames-1, 0);
  
          encode_qlogs(s);
      }
  
      if(!s->keyframe){
          int update_mc=0;
          for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){
              Plane *p= &s->plane[plane_index];
              update_mc |= p->last_htaps   != p->htaps;
              update_mc |= p->last_diag_mc != p->diag_mc;
              update_mc |= !!memcmp(p->last_hcoeff, p->hcoeff, sizeof(p->hcoeff));
          }
          put_rac(&s->c, s->header_state, update_mc);
          if(update_mc){
              for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){
                  Plane *p= &s->plane[plane_index];
                  put_rac(&s->c, s->header_state, p->diag_mc);
                  put_symbol(&s->c, s->header_state, p->htaps/2-1, 0);
                  for(i= p->htaps/2; i; i--)
                      put_symbol(&s->c, s->header_state, FFABS(p->hcoeff[i]), 0);
              }
          }
          if(s->last_spatial_decomposition_count != s->spatial_decomposition_count){
              put_rac(&s->c, s->header_state, 1);
              put_symbol(&s->c, s->header_state, s->spatial_decomposition_count, 0);
              encode_qlogs(s);
          }else
              put_rac(&s->c, s->header_state, 0);
      }
  
      put_symbol(&s->c, s->header_state, s->spatial_decomposition_type - s->last_spatial_decomposition_type, 1);
      put_symbol(&s->c, s->header_state, s->qlog            - s->last_qlog    , 1);
      put_symbol(&s->c, s->header_state, s->mv_scale        - s->last_mv_scale, 1);
      put_symbol(&s->c, s->header_state, s->qbias           - s->last_qbias   , 1);
      put_symbol(&s->c, s->header_state, s->block_max_depth - s->last_block_max_depth, 1);
  
  }
  
  static void update_last_header_values(SnowContext *s){
      int plane_index;
  
      if(!s->keyframe){
          for(plane_index=0; plane_index<2; plane_index++){
              Plane *p= &s->plane[plane_index];
              p->last_diag_mc= p->diag_mc;
              p->last_htaps  = p->htaps;
              memcpy(p->last_hcoeff, p->hcoeff, sizeof(p->hcoeff));
          }
      }
  
      s->last_spatial_decomposition_type  = s->spatial_decomposition_type;
      s->last_qlog                        = s->qlog;
      s->last_qbias                       = s->qbias;
      s->last_mv_scale                    = s->mv_scale;
      s->last_block_max_depth             = s->block_max_depth;
      s->last_spatial_decomposition_count = s->spatial_decomposition_count;
  }
  
  static int qscale2qlog(int qscale){
      return lrint(QROOT*log2(qscale / (float)FF_QP2LAMBDA))
             + 61*QROOT/8; ///< 64 > 60
  }
  
  static int ratecontrol_1pass(SnowContext *s, AVFrame *pict)
  {
      /* Estimate the frame's complexity as a sum of weighted dwt coefficients.
       * FIXME we know exact mv bits at this point,
       * but ratecontrol isn't set up to include them. */
      uint32_t coef_sum= 0;
      int level, orientation, delta_qlog;
  
      for(level=0; level<s->spatial_decomposition_count; level++){
          for(orientation=level ? 1 : 0; orientation<4; orientation++){
              SubBand *b= &s->plane[0].band[level][orientation];
              IDWTELEM *buf= b->ibuf;
              const int w= b->width;
              const int h= b->height;
              const int stride= b->stride;
              const int qlog= av_clip(2*QROOT + b->qlog, 0, QROOT*16);
              const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
              const int qdiv= (1<<16)/qmul;
              int x, y;
              //FIXME this is ugly
              for(y=0; y<h; y++)
                  for(x=0; x<w; x++)
                      buf[x+y*stride]= b->buf[x+y*stride];
              if(orientation==0)
                  decorrelate(s, b, buf, stride, 1, 0);
              for(y=0; y<h; y++)
                  for(x=0; x<w; x++)
                      coef_sum+= abs(buf[x+y*stride]) * qdiv >> 16;
          }
      }
  
      /* ugly, ratecontrol just takes a sqrt again */
      av_assert0(coef_sum < INT_MAX);
      coef_sum = (uint64_t)coef_sum * coef_sum >> 16;
  
      if(pict->pict_type == AV_PICTURE_TYPE_I){
          s->m.current_picture.mb_var_sum= coef_sum;
          s->m.current_picture.mc_mb_var_sum= 0;
      }else{
          s->m.current_picture.mc_mb_var_sum= coef_sum;
          s->m.current_picture.mb_var_sum= 0;
      }
  
      pict->quality= ff_rate_estimate_qscale(&s->m, 1);
      if (pict->quality < 0)
          return INT_MIN;
      s->lambda= pict->quality * 3/2;
      delta_qlog= qscale2qlog(pict->quality) - s->qlog;
      s->qlog+= delta_qlog;
      return delta_qlog;
  }
  
  static void calculate_visual_weight(SnowContext *s, Plane *p){
      int width = p->width;
      int height= p->height;
      int level, orientation, x, y;
  
      for(level=0; level<s->spatial_decomposition_count; level++){
          for(orientation=level ? 1 : 0; orientation<4; orientation++){
              SubBand *b= &p->band[level][orientation];
              IDWTELEM *ibuf= b->ibuf;
              int64_t error=0;
  
              memset(s->spatial_idwt_buffer, 0, sizeof(*s->spatial_idwt_buffer)*width*height);
              ibuf[b->width/2 + b->height/2*b->stride]= 256*16;
              ff_spatial_idwt(s->spatial_idwt_buffer, s->temp_idwt_buffer, width, height, width, s->spatial_decomposition_type, s->spatial_decomposition_count);
              for(y=0; y<height; y++){
                  for(x=0; x<width; x++){
                      int64_t d= s->spatial_idwt_buffer[x + y*width]*16;
                      error += d*d;
                  }
              }
  
              b->qlog= (int)(QROOT * log2(352256.0/sqrt(error)) + 0.5);
          }
      }
  }
  
  static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                          const AVFrame *pict, int *got_packet)
  {
      SnowContext *s = avctx->priv_data;
      RangeCoder * const c= &s->c;
      AVFrame *pic;
      const int width= s->avctx->width;
      const int height= s->avctx->height;
      int level, orientation, plane_index, i, y, ret;
      uint8_t rc_header_bak[sizeof(s->header_state)];
      uint8_t rc_block_bak[sizeof(s->block_state)];
  
      if ((ret = ff_alloc_packet2(avctx, pkt, s->b_width*s->b_height*MB_SIZE*MB_SIZE*3 + AV_INPUT_BUFFER_MIN_SIZE, 0)) < 0)
          return ret;
  
      ff_init_range_encoder(c, pkt->data, pkt->size);
      ff_build_rac_states(c, (1LL<<32)/20, 256-8);
  
      for(i=0; i < s->nb_planes; i++){
          int hshift= i ? s->chroma_h_shift : 0;
          int vshift= i ? s->chroma_v_shift : 0;
          for(y=0; y<AV_CEIL_RSHIFT(height, vshift); y++)
              memcpy(&s->input_picture->data[i][y * s->input_picture->linesize[i]],
                     &pict->data[i][y * pict->linesize[i]],
                     AV_CEIL_RSHIFT(width, hshift));
          s->mpvencdsp.draw_edges(s->input_picture->data[i], s->input_picture->linesize[i],
                                  AV_CEIL_RSHIFT(width, hshift), AV_CEIL_RSHIFT(height, vshift),
                                  EDGE_WIDTH >> hshift, EDGE_WIDTH >> vshift,
                                  EDGE_TOP | EDGE_BOTTOM);
  
      }
      emms_c();
      pic = s->input_picture;
      pic->pict_type = pict->pict_type;
      pic->quality = pict->quality;
  
      s->m.picture_number= avctx->frame_number;
      if(avctx->flags&AV_CODEC_FLAG_PASS2){
          s->m.pict_type = pic->pict_type = s->m.rc_context.entry[avctx->frame_number].new_pict_type;
          s->keyframe = pic->pict_type == AV_PICTURE_TYPE_I;
          if(!(avctx->flags&AV_CODEC_FLAG_QSCALE)) {
              pic->quality = ff_rate_estimate_qscale(&s->m, 0);
              if (pic->quality < 0)
                  return -1;
          }
      }else{
          s->keyframe= avctx->gop_size==0 || avctx->frame_number % avctx->gop_size == 0;
          s->m.pict_type = pic->pict_type = s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
      }
  
      if(s->pass1_rc && avctx->frame_number == 0)
          pic->quality = 2*FF_QP2LAMBDA;
      if (pic->quality) {
          s->qlog   = qscale2qlog(pic->quality);
          s->lambda = pic->quality * 3/2;
      }
      if (s->qlog < 0 || (!pic->quality && (avctx->flags & AV_CODEC_FLAG_QSCALE))) {
          s->qlog= LOSSLESS_QLOG;
          s->lambda = 0;
      }//else keep previous frame's qlog until after motion estimation
  
  #if FF_API_CODED_FRAME
  FF_DISABLE_DEPRECATION_WARNINGS
      av_frame_unref(avctx->coded_frame);
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
      if (s->current_picture->data[0]) {
          int w = s->avctx->width;
          int h = s->avctx->height;
  
  #if FF_API_CODED_FRAME
          ret = av_frame_make_writable(s->current_picture);
          if (ret < 0)
              return ret;
  #endif
  
          s->mpvencdsp.draw_edges(s->current_picture->data[0],
                                  s->current_picture->linesize[0], w   , h   ,
                                  EDGE_WIDTH  , EDGE_WIDTH  , EDGE_TOP | EDGE_BOTTOM);
          if (s->current_picture->data[2]) {
              s->mpvencdsp.draw_edges(s->current_picture->data[1],
                                      s->current_picture->linesize[1], w>>s->chroma_h_shift, h>>s->chroma_v_shift,
                                      EDGE_WIDTH>>s->chroma_h_shift, EDGE_WIDTH>>s->chroma_v_shift, EDGE_TOP | EDGE_BOTTOM);
              s->mpvencdsp.draw_edges(s->current_picture->data[2],
                                      s->current_picture->linesize[2], w>>s->chroma_h_shift, h>>s->chroma_v_shift,
                                      EDGE_WIDTH>>s->chroma_h_shift, EDGE_WIDTH>>s->chroma_v_shift, EDGE_TOP | EDGE_BOTTOM);
          }
          emms_c();
      }
  
      ff_snow_frame_start(s);
  #if FF_API_CODED_FRAME
  FF_DISABLE_DEPRECATION_WARNINGS
      ret = av_frame_ref(avctx->coded_frame, s->current_picture);
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
      if (ret < 0)
          return ret;
  
      s->m.current_picture_ptr= &s->m.current_picture;
      s->m.current_picture.f = s->current_picture;
      s->m.current_picture.f->pts = pict->pts;
      if(pic->pict_type == AV_PICTURE_TYPE_P){
          int block_width = (width +15)>>4;
          int block_height= (height+15)>>4;
          int stride= s->current_picture->linesize[0];
  
          av_assert0(s->current_picture->data[0]);
          av_assert0(s->last_picture[0]->data[0]);
  
          s->m.avctx= s->avctx;
          s->m.   last_picture.f = s->last_picture[0];
          s->m.    new_picture.f = s->input_picture;
          s->m.   last_picture_ptr= &s->m.   last_picture;
          s->m.linesize = stride;
          s->m.uvlinesize= s->current_picture->linesize[1];
          s->m.width = width;
          s->m.height= height;
          s->m.mb_width = block_width;
          s->m.mb_height= block_height;
          s->m.mb_stride=   s->m.mb_width+1;
          s->m.b8_stride= 2*s->m.mb_width+1;
          s->m.f_code=1;
          s->m.pict_type = pic->pict_type;
          s->m.motion_est= s->motion_est;
          s->m.me.scene_change_score=0;
          s->m.me.dia_size = avctx->dia_size;
          s->m.quarter_sample= (s->avctx->flags & AV_CODEC_FLAG_QPEL)!=0;
          s->m.out_format= FMT_H263;
          s->m.unrestricted_mv= 1;
  
          s->m.lambda = s->lambda;
          s->m.qscale= (s->m.lambda*139 + FF_LAMBDA_SCALE*64) >> (FF_LAMBDA_SHIFT + 7);
          s->lambda2= s->m.lambda2= (s->m.lambda*s->m.lambda + FF_LAMBDA_SCALE/2) >> FF_LAMBDA_SHIFT;
  
          s->m.mecc= s->mecc; //move
          s->m.qdsp= s->qdsp; //move
          s->m.hdsp = s->hdsp;
          ff_init_me(&s->m);
          s->hdsp = s->m.hdsp;
          s->mecc= s->m.mecc;
      }
  
      if(s->pass1_rc){
          memcpy(rc_header_bak, s->header_state, sizeof(s->header_state));
          memcpy(rc_block_bak, s->block_state, sizeof(s->block_state));
      }
  
  redo_frame:
  
      s->spatial_decomposition_count= 5;
  
      while(   !(width >>(s->chroma_h_shift + s->spatial_decomposition_count))
            || !(height>>(s->chroma_v_shift + s->spatial_decomposition_count)))
          s->spatial_decomposition_count--;
  
      if (s->spatial_decomposition_count <= 0) {
          av_log(avctx, AV_LOG_ERROR, "Resolution too low\n");
          return AVERROR(EINVAL);
      }
  
      s->m.pict_type = pic->pict_type;
      s->qbias = pic->pict_type == AV_PICTURE_TYPE_P ? 2 : 0;
  
      ff_snow_common_init_after_header(avctx);
  
      if(s->last_spatial_decomposition_count != s->spatial_decomposition_count){
          for(plane_index=0; plane_index < s->nb_planes; plane_index++){
              calculate_visual_weight(s, &s->plane[plane_index]);
          }
      }
  
      encode_header(s);
      s->m.misc_bits = 8*(s->c.bytestream - s->c.bytestream_start);
      encode_blocks(s, 1);
      s->m.mv_bits = 8*(s->c.bytestream - s->c.bytestream_start) - s->m.misc_bits;
  
      for(plane_index=0; plane_index < s->nb_planes; plane_index++){
          Plane *p= &s->plane[plane_index];
          int w= p->width;
          int h= p->height;
          int x, y;
  //        int bits= put_bits_count(&s->c.pb);
  
          if (!s->memc_only) {
              //FIXME optimize
              if(pict->data[plane_index]) //FIXME gray hack
                  for(y=0; y<h; y++){
                      for(x=0; x<w; x++){
                          s->spatial_idwt_buffer[y*w + x]= pict->data[plane_index][y*pict->linesize[plane_index] + x]<<FRAC_BITS;
                      }
                  }
              predict_plane(s, s->spatial_idwt_buffer, plane_index, 0);
  
  #if FF_API_PRIVATE_OPT
  FF_DISABLE_DEPRECATION_WARNINGS
              if(s->avctx->scenechange_threshold)
                  s->scenechange_threshold = s->avctx->scenechange_threshold;
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
              if(   plane_index==0
                 && pic->pict_type == AV_PICTURE_TYPE_P
                 && !(avctx->flags&AV_CODEC_FLAG_PASS2)
                 && s->m.me.scene_change_score > s->scenechange_threshold){
                  ff_init_range_encoder(c, pkt->data, pkt->size);
                  ff_build_rac_states(c, (1LL<<32)/20, 256-8);
                  pic->pict_type= AV_PICTURE_TYPE_I;
                  s->keyframe=1;
                  s->current_picture->key_frame=1;
                  goto redo_frame;
              }
  
              if(s->qlog == LOSSLESS_QLOG){
                  for(y=0; y<h; y++){
                      for(x=0; x<w; x++){
                          s->spatial_dwt_buffer[y*w + x]= (s->spatial_idwt_buffer[y*w + x] + (1<<(FRAC_BITS-1))-1)>>FRAC_BITS;
                      }
                  }
              }else{
                  for(y=0; y<h; y++){
                      for(x=0; x<w; x++){
                          s->spatial_dwt_buffer[y*w + x]= s->spatial_idwt_buffer[y*w + x] * (1 << ENCODER_EXTRA_BITS);
                      }
                  }
              }
  
              ff_spatial_dwt(s->spatial_dwt_buffer, s->temp_dwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count);
  
              if(s->pass1_rc && plane_index==0){
                  int delta_qlog = ratecontrol_1pass(s, pic);
                  if (delta_qlog <= INT_MIN)
                      return -1;
                  if(delta_qlog){
                      //reordering qlog in the bitstream would eliminate this reset
                      ff_init_range_encoder(c, pkt->data, pkt->size);
                      memcpy(s->header_state, rc_header_bak, sizeof(s->header_state));
                      memcpy(s->block_state, rc_block_bak, sizeof(s->block_state));
                      encode_header(s);
                      encode_blocks(s, 0);
                  }
              }
  
              for(level=0; level<s->spatial_decomposition_count; level++){
                  for(orientation=level ? 1 : 0; orientation<4; orientation++){
                      SubBand *b= &p->band[level][orientation];
  
                      quantize(s, b, b->ibuf, b->buf, b->stride, s->qbias);
                      if(orientation==0)
                          decorrelate(s, b, b->ibuf, b->stride, pic->pict_type == AV_PICTURE_TYPE_P, 0);
                      if (!s->no_bitstream)
                      encode_subband(s, b, b->ibuf, b->parent ? b->parent->ibuf : NULL, b->stride, orientation);
                      av_assert0(b->parent==NULL || b->parent->stride == b->stride*2);
                      if(orientation==0)
                          correlate(s, b, b->ibuf, b->stride, 1, 0);
                  }
              }
  
              for(level=0; level<s->spatial_decomposition_count; level++){
                  for(orientation=level ? 1 : 0; orientation<4; orientation++){
                      SubBand *b= &p->band[level][orientation];
  
                      dequantize(s, b, b->ibuf, b->stride);
                  }
              }
  
              ff_spatial_idwt(s->spatial_idwt_buffer, s->temp_idwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count);
              if(s->qlog == LOSSLESS_QLOG){
                  for(y=0; y<h; y++){
                      for(x=0; x<w; x++){
                          s->spatial_idwt_buffer[y*w + x]<<=FRAC_BITS;
                      }
                  }
              }
              predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
          }else{
              //ME/MC only
              if(pic->pict_type == AV_PICTURE_TYPE_I){
                  for(y=0; y<h; y++){
                      for(x=0; x<w; x++){
                          s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x]=
                              pict->data[plane_index][y*pict->linesize[plane_index] + x];
                      }
                  }
              }else{
                  memset(s->spatial_idwt_buffer, 0, sizeof(IDWTELEM)*w*h);
                  predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
              }
          }
          if(s->avctx->flags&AV_CODEC_FLAG_PSNR){
              int64_t error= 0;
  
              if(pict->data[plane_index]) //FIXME gray hack
                  for(y=0; y<h; y++){
                      for(x=0; x<w; x++){
                          int d= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x] - pict->data[plane_index][y*pict->linesize[plane_index] + x];
                          error += d*d;
                      }
                  }
              s->avctx->error[plane_index] += error;
              s->encoding_error[plane_index] = error;
          }
  
      }
      emms_c();
  
      update_last_header_values(s);
  
      ff_snow_release_buffer(avctx);
  
      s->current_picture->coded_picture_number = avctx->frame_number;
      s->current_picture->pict_type = pic->pict_type;
      s->current_picture->quality = pic->quality;
      s->m.frame_bits = 8*(s->c.bytestream - s->c.bytestream_start);
      s->m.p_tex_bits = s->m.frame_bits - s->m.misc_bits - s->m.mv_bits;
      s->m.current_picture.f->display_picture_number =
      s->m.current_picture.f->coded_picture_number   = avctx->frame_number;
      s->m.current_picture.f->quality                = pic->quality;
      s->m.total_bits += 8*(s->c.bytestream - s->c.bytestream_start);
      if(s->pass1_rc)
          if (ff_rate_estimate_qscale(&s->m, 0) < 0)
              return -1;
      if(avctx->flags&AV_CODEC_FLAG_PASS1)
          ff_write_pass1_stats(&s->m);
      s->m.last_pict_type = s->m.pict_type;
  #if FF_API_STAT_BITS
  FF_DISABLE_DEPRECATION_WARNINGS
      avctx->frame_bits = s->m.frame_bits;
      avctx->mv_bits = s->m.mv_bits;
      avctx->misc_bits = s->m.misc_bits;
      avctx->p_tex_bits = s->m.p_tex_bits;
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
      emms_c();
  
      ff_side_data_set_encoder_stats(pkt, s->current_picture->quality,
                                     s->encoding_error,
                                     (s->avctx->flags&AV_CODEC_FLAG_PSNR) ? 4 : 0,
                                     s->current_picture->pict_type);
  
  #if FF_API_ERROR_FRAME
  FF_DISABLE_DEPRECATION_WARNINGS
      memcpy(s->current_picture->error, s->encoding_error, sizeof(s->encoding_error));
  FF_ENABLE_DEPRECATION_WARNINGS
  #endif
  
      pkt->size = ff_rac_terminate(c, 0);
      if (s->current_picture->key_frame)
          pkt->flags |= AV_PKT_FLAG_KEY;
      *got_packet = 1;
  
      return 0;
  }
  
  static av_cold int encode_end(AVCodecContext *avctx)
  {
      SnowContext *s = avctx->priv_data;
  
      ff_snow_common_end(s);
      ff_rate_control_uninit(&s->m);
      av_frame_free(&s->input_picture);
      av_freep(&avctx->stats_out);
  
      return 0;
  }
  
  #define OFFSET(x) offsetof(SnowContext, x)
  #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
  static const AVOption options[] = {
      {"motion_est", "motion estimation algorithm", OFFSET(motion_est), AV_OPT_TYPE_INT, {.i64 = FF_ME_EPZS }, FF_ME_ZERO, FF_ME_ITER, VE, "motion_est" },
      { "zero", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FF_ME_ZERO }, 0, 0, VE, "motion_est" },
      { "epzs", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FF_ME_EPZS }, 0, 0, VE, "motion_est" },
      { "xone", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FF_ME_XONE }, 0, 0, VE, "motion_est" },
      { "iter", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FF_ME_ITER }, 0, 0, VE, "motion_est" },
      { "memc_only",      "Only do ME/MC (I frames -> ref, P frame -> ME+MC).",   OFFSET(memc_only), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
      { "no_bitstream",   "Skip final bitstream writeout.",                    OFFSET(no_bitstream), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
      { "intra_penalty",  "Penalty for intra blocks in block decission",      OFFSET(intra_penalty), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
      { "iterative_dia_size",  "Dia size for the iterative ME",          OFFSET(iterative_dia_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
      { "sc_threshold",   "Scene change threshold",                   OFFSET(scenechange_threshold), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, VE },
      { "pred",           "Spatial decomposition type",                                OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 0 }, DWT_97, DWT_53, VE, "pred" },
          { "dwt97", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "pred" },
          { "dwt53", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
      { NULL },
  };
  
  static const AVClass snowenc_class = {
      .class_name = "snow encoder",
      .item_name  = av_default_item_name,
      .option     = options,
      .version    = LIBAVUTIL_VERSION_INT,
  };
  
  AVCodec ff_snow_encoder = {
      .name           = "snow",
      .long_name      = NULL_IF_CONFIG_SMALL("Snow"),
      .type           = AVMEDIA_TYPE_VIDEO,
      .id             = AV_CODEC_ID_SNOW,
      .priv_data_size = sizeof(SnowContext),
      .init           = encode_init,
      .encode2        = encode_frame,
      .close          = encode_end,
      .pix_fmts       = (const enum AVPixelFormat[]){
          AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV444P,
          AV_PIX_FMT_GRAY8,
          AV_PIX_FMT_NONE
      },
      .priv_class     = &snowenc_class,
      .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
                        FF_CODEC_CAP_INIT_CLEANUP,
  };
  