git.sesse.net Git - ffmpeg/blob - libavcodec/snowenc.c

   1 /*
   2  * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * Libav is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "libavutil/intmath.h"
  22 #include "libavutil/log.h"
  23 #include "libavutil/opt.h"
  24 #include "avcodec.h"
  25 #include "dsputil.h"
  26 #include "dwt.h"
  27 #include "snow.h"
  28
  29 #include "rangecoder.h"
  30 #include "mathops.h"
  31
  32 #include "mpegvideo.h"
  33 #include "h263.h"
  34
  35 #undef NDEBUG
  36 #include <assert.h>
  37
  38 #define QUANTIZE2 0
  39
  40 #if QUANTIZE2==1
  41 #define Q2_STEP 8
  42
  43 static void find_sse(SnowContext *s, Plane *p, int *score, int score_stride, IDWTELEM *r0, IDWTELEM *r1, int level, int orientation){
  44     SubBand *b= &p->band[level][orientation];
  45     int x, y;
  46     int xo=0;
  47     int yo=0;
  48     int step= 1 << (s->spatial_decomposition_count - level);
  49
  50     if(orientation&1)
  51         xo= step>>1;
  52     if(orientation&2)
  53         yo= step>>1;
  54
  55     //FIXME bias for nonzero ?
  56     //FIXME optimize
  57     memset(score, 0, sizeof(*score)*score_stride*((p->height + Q2_STEP-1)/Q2_STEP));
  58     for(y=0; y<p->height; y++){
  59         for(x=0; x<p->width; x++){
  60             int sx= (x-xo + step/2) / step / Q2_STEP;
  61             int sy= (y-yo + step/2) / step / Q2_STEP;
  62             int v= r0[x + y*p->width] - r1[x + y*p->width];
  63             assert(sx>=0 && sy>=0 && sx < score_stride);
  64             v= ((v+8)>>4)<<4;
  65             score[sx + sy*score_stride] += v*v;
  66             assert(score[sx + sy*score_stride] >= 0);
  67         }
  68     }
  69 }
  70
  71 static void dequantize_all(SnowContext *s, Plane *p, IDWTELEM *buffer, int width, int height){
  72     int level, orientation;
  73
  74     for(level=0; level<s->spatial_decomposition_count; level++){
  75         for(orientation=level ? 1 : 0; orientation<4; orientation++){
  76             SubBand *b= &p->band[level][orientation];
  77             IDWTELEM *dst= buffer + (b->ibuf - s->spatial_idwt_buffer);
  78
  79             dequantize(s, b, dst, b->stride);
  80         }
  81     }
  82 }
  83
  84 static void dwt_quantize(SnowContext *s, Plane *p, DWTELEM *buffer, int width, int height, int stride, int type){
  85     int level, orientation, ys, xs, x, y, pass;
  86     IDWTELEM best_dequant[height * stride];
  87     IDWTELEM idwt2_buffer[height * stride];
  88     const int score_stride= (width + 10)/Q2_STEP;
  89     int best_score[(width + 10)/Q2_STEP * (height + 10)/Q2_STEP]; //FIXME size
  90     int score[(width + 10)/Q2_STEP * (height + 10)/Q2_STEP]; //FIXME size
  91     int threshold= (s->m.lambda * s->m.lambda) >> 6;
  92
  93     //FIXME pass the copy cleanly ?
  94
  95 //    memcpy(dwt_buffer, buffer, height * stride * sizeof(DWTELEM));
  96     ff_spatial_dwt(buffer, width, height, stride, type, s->spatial_decomposition_count);
  97
  98     for(level=0; level<s->spatial_decomposition_count; level++){
  99         for(orientation=level ? 1 : 0; orientation<4; orientation++){
 100             SubBand *b= &p->band[level][orientation];
 101             IDWTELEM *dst= best_dequant + (b->ibuf - s->spatial_idwt_buffer);
 102              DWTELEM *src=       buffer + (b-> buf - s->spatial_dwt_buffer);
 103             assert(src == b->buf); // code does not depend on this but it is true currently
 104
 105             quantize(s, b, dst, src, b->stride, s->qbias);
 106         }
 107     }
 108     for(pass=0; pass<1; pass++){
 109         if(s->qbias == 0) //keyframe
 110             continue;
 111         for(level=0; level<s->spatial_decomposition_count; level++){
 112             for(orientation=level ? 1 : 0; orientation<4; orientation++){
 113                 SubBand *b= &p->band[level][orientation];
 114                 IDWTELEM *dst= idwt2_buffer + (b->ibuf - s->spatial_idwt_buffer);
 115                 IDWTELEM *best_dst= best_dequant + (b->ibuf - s->spatial_idwt_buffer);
 116
 117                 for(ys= 0; ys<Q2_STEP; ys++){
 118                     for(xs= 0; xs<Q2_STEP; xs++){
 119                         memcpy(idwt2_buffer, best_dequant, height * stride * sizeof(IDWTELEM));
 120                         dequantize_all(s, p, idwt2_buffer, width, height);
 121                         ff_spatial_idwt(idwt2_buffer, width, height, stride, type, s->spatial_decomposition_count);
 122                         find_sse(s, p, best_score, score_stride, idwt2_buffer, s->spatial_idwt_buffer, level, orientation);
 123                         memcpy(idwt2_buffer, best_dequant, height * stride * sizeof(IDWTELEM));
 124                         for(y=ys; y<b->height; y+= Q2_STEP){
 125                             for(x=xs; x<b->width; x+= Q2_STEP){
 126                                 if(dst[x + y*b->stride]<0) dst[x + y*b->stride]++;
 127                                 if(dst[x + y*b->stride]>0) dst[x + y*b->stride]--;
 128                                 //FIXME try more than just --
 129                             }
 130                         }
 131                         dequantize_all(s, p, idwt2_buffer, width, height);
 132                         ff_spatial_idwt(idwt2_buffer, width, height, stride, type, s->spatial_decomposition_count);
 133                         find_sse(s, p, score, score_stride, idwt2_buffer, s->spatial_idwt_buffer, level, orientation);
 134                         for(y=ys; y<b->height; y+= Q2_STEP){
 135                             for(x=xs; x<b->width; x+= Q2_STEP){
 136                                 int score_idx= x/Q2_STEP + (y/Q2_STEP)*score_stride;
 137                                 if(score[score_idx] <= best_score[score_idx] + threshold){
 138                                     best_score[score_idx]= score[score_idx];
 139                                     if(best_dst[x + y*b->stride]<0) best_dst[x + y*b->stride]++;
 140                                     if(best_dst[x + y*b->stride]>0) best_dst[x + y*b->stride]--;
 141                                     //FIXME copy instead
 142                                 }
 143                             }
 144                         }
 145                     }
 146                 }
 147             }
 148         }
 149     }
 150     memcpy(s->spatial_idwt_buffer, best_dequant, height * stride * sizeof(IDWTELEM)); //FIXME work with that directly instead of copy at the end
 151 }
 152
 153 #endif /* QUANTIZE2==1 */
 154
 155 #if CONFIG_SNOW_ENCODER
 156 static av_cold int encode_init(AVCodecContext *avctx)
 157 {
 158     SnowContext *s = avctx->priv_data;
 159     int plane_index;
 160
 161     if(avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
 162         av_log(avctx, AV_LOG_ERROR, "This codec is under development, files encoded with it may not be decodable with future versions!!!\n"
 163                "Use vstrict=-2 / -strict -2 to use it anyway.\n");
 164         return -1;
 165     }
 166
 167     if(avctx->prediction_method == DWT_97
 168        && (avctx->flags & CODEC_FLAG_QSCALE)
 169        && avctx->global_quality == 0){
 170         av_log(avctx, AV_LOG_ERROR, "The 9/7 wavelet is incompatible with lossless mode.\n");
 171         return -1;
 172     }
 173
 174     s->spatial_decomposition_type= avctx->prediction_method; //FIXME add decorrelator type r transform_type
 175
 176     s->mv_scale       = (avctx->flags & CODEC_FLAG_QPEL) ? 2 : 4;
 177     s->block_max_depth= (avctx->flags & CODEC_FLAG_4MV ) ? 1 : 0;
 178
 179     for(plane_index=0; plane_index<3; plane_index++){
 180         s->plane[plane_index].diag_mc= 1;
 181         s->plane[plane_index].htaps= 6;
 182         s->plane[plane_index].hcoeff[0]=  40;
 183         s->plane[plane_index].hcoeff[1]= -10;
 184         s->plane[plane_index].hcoeff[2]=   2;
 185         s->plane[plane_index].fast_mc= 1;
 186     }
 187
 188     ff_snow_common_init(avctx);
 189     ff_snow_alloc_blocks(s);
 190
 191     s->version=0;
 192
 193     s->m.avctx   = avctx;
 194     s->m.flags   = avctx->flags;
 195     s->m.bit_rate= avctx->bit_rate;
 196
 197     s->m.me.temp      =
 198     s->m.me.scratchpad= av_mallocz((avctx->width+64)*2*16*2*sizeof(uint8_t));
 199     s->m.me.map       = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
 200     s->m.me.score_map = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
 201     s->m.obmc_scratchpad= av_mallocz(MB_SIZE*MB_SIZE*12*sizeof(uint32_t));
 202     ff_h263_encode_init(&s->m); //mv_penalty
 203
 204     s->max_ref_frames = FFMAX(FFMIN(avctx->refs, MAX_REF_FRAMES), 1);
 205
 206     if(avctx->flags&CODEC_FLAG_PASS1){
 207         if(!avctx->stats_out)
 208             avctx->stats_out = av_mallocz(256);
 209     }
 210     if((avctx->flags&CODEC_FLAG_PASS2) || !(avctx->flags&CODEC_FLAG_QSCALE)){
 211         if(ff_rate_control_init(&s->m) < 0)
 212             return -1;
 213     }
 214     s->pass1_rc= !(avctx->flags & (CODEC_FLAG_QSCALE|CODEC_FLAG_PASS2));
 215
 216     avctx->coded_frame= &s->current_picture;
 217     switch(avctx->pix_fmt){
 218 //    case PIX_FMT_YUV444P:
 219 //    case PIX_FMT_YUV422P:
 220     case PIX_FMT_YUV420P:
 221     case PIX_FMT_GRAY8:
 222 //    case PIX_FMT_YUV411P:
 223 //    case PIX_FMT_YUV410P:
 224         s->colorspace_type= 0;
 225         break;
 226 /*    case PIX_FMT_RGB32:
 227         s->colorspace= 1;
 228         break;*/
 229     default:
 230         av_log(avctx, AV_LOG_ERROR, "pixel format not supported\n");
 231         return -1;
 232     }
 233 //    avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift, &s->chroma_v_shift);
 234     s->chroma_h_shift= 1;
 235     s->chroma_v_shift= 1;
 236
 237     ff_set_cmp(&s->dsp, s->dsp.me_cmp, s->avctx->me_cmp);
 238     ff_set_cmp(&s->dsp, s->dsp.me_sub_cmp, s->avctx->me_sub_cmp);
 239
 240     s->avctx->get_buffer(s->avctx, &s->input_picture);
 241
 242     if(s->avctx->me_method == ME_ITER){
 243         int i;
 244         int size= s->b_width * s->b_height << 2*s->block_max_depth;
 245         for(i=0; i<s->max_ref_frames; i++){
 246             s->ref_mvs[i]= av_mallocz(size*sizeof(int16_t[2]));
 247             s->ref_scores[i]= av_mallocz(size*sizeof(uint32_t));
 248         }
 249     }
 250
 251     return 0;
 252 }
 253
 254 //near copy & paste from dsputil, FIXME
 255 static int pix_sum(uint8_t * pix, int line_size, int w)
 256 {
 257     int s, i, j;
 258
 259     s = 0;
 260     for (i = 0; i < w; i++) {
 261         for (j = 0; j < w; j++) {
 262             s += pix[0];
 263             pix ++;
 264         }
 265         pix += line_size - w;
 266     }
 267     return s;
 268 }
 269
 270 //near copy & paste from dsputil, FIXME
 271 static int pix_norm1(uint8_t * pix, int line_size, int w)
 272 {
 273     int s, i, j;
 274     uint32_t *sq = ff_squareTbl + 256;
 275
 276     s = 0;
 277     for (i = 0; i < w; i++) {
 278         for (j = 0; j < w; j ++) {
 279             s += sq[pix[0]];
 280             pix ++;
 281         }
 282         pix += line_size - w;
 283     }
 284     return s;
 285 }
 286
 287 //FIXME copy&paste
 288 #define P_LEFT P[1]
 289 #define P_TOP P[2]
 290 #define P_TOPRIGHT P[3]
 291 #define P_MEDIAN P[4]
 292 #define P_MV1 P[9]
 293 #define FLAG_QPEL   1 //must be 1
 294
 295 static int encode_q_branch(SnowContext *s, int level, int x, int y){
 296     uint8_t p_buffer[1024];
 297     uint8_t i_buffer[1024];
 298     uint8_t p_state[sizeof(s->block_state)];
 299     uint8_t i_state[sizeof(s->block_state)];
 300     RangeCoder pc, ic;
 301     uint8_t *pbbak= s->c.bytestream;
 302     uint8_t *pbbak_start= s->c.bytestream_start;
 303     int score, score2, iscore, i_len, p_len, block_s, sum, base_bits;
 304     const int w= s->b_width  << s->block_max_depth;
 305     const int h= s->b_height << s->block_max_depth;
 306     const int rem_depth= s->block_max_depth - level;
 307     const int index= (x + y*w) << rem_depth;
 308     const int block_w= 1<<(LOG2_MB_SIZE - level);
 309     int trx= (x+1)<<rem_depth;
 310     int try= (y+1)<<rem_depth;
 311     const BlockNode *left  = x ? &s->block[index-1] : &null_block;
 312     const BlockNode *top   = y ? &s->block[index-w] : &null_block;
 313     const BlockNode *right = trx<w ? &s->block[index+1] : &null_block;
 314     const BlockNode *bottom= try<h ? &s->block[index+w] : &null_block;
 315     const BlockNode *tl    = y && x ? &s->block[index-w-1] : left;
 316     const BlockNode *tr    = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
 317     int pl = left->color[0];
 318     int pcb= left->color[1];
 319     int pcr= left->color[2];
 320     int pmx, pmy;
 321     int mx=0, my=0;
 322     int l,cr,cb;
 323     const int stride= s->current_picture.linesize[0];
 324     const int uvstride= s->current_picture.linesize[1];
 325     uint8_t *current_data[3]= { s->input_picture.data[0] + (x + y*  stride)*block_w,
 326                                 s->input_picture.data[1] + (x + y*uvstride)*block_w/2,
 327                                 s->input_picture.data[2] + (x + y*uvstride)*block_w/2};
 328     int P[10][2];
 329     int16_t last_mv[3][2];
 330     int qpel= !!(s->avctx->flags & CODEC_FLAG_QPEL); //unused
 331     const int shift= 1+qpel;
 332     MotionEstContext *c= &s->m.me;
 333     int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
 334     int mx_context= av_log2(2*FFABS(left->mx - top->mx));
 335     int my_context= av_log2(2*FFABS(left->my - top->my));
 336     int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
 337     int ref, best_ref, ref_score, ref_mx, ref_my;
 338
 339     assert(sizeof(s->block_state) >= 256);
 340     if(s->keyframe){
 341         set_blocks(s, level, x, y, pl, pcb, pcr, 0, 0, 0, BLOCK_INTRA);
 342         return 0;
 343     }
 344
 345 //    clip predictors / edge ?
 346
 347     P_LEFT[0]= left->mx;
 348     P_LEFT[1]= left->my;
 349     P_TOP [0]= top->mx;
 350     P_TOP [1]= top->my;
 351     P_TOPRIGHT[0]= tr->mx;
 352     P_TOPRIGHT[1]= tr->my;
 353
 354     last_mv[0][0]= s->block[index].mx;
 355     last_mv[0][1]= s->block[index].my;
 356     last_mv[1][0]= right->mx;
 357     last_mv[1][1]= right->my;
 358     last_mv[2][0]= bottom->mx;
 359     last_mv[2][1]= bottom->my;
 360
 361     s->m.mb_stride=2;
 362     s->m.mb_x=
 363     s->m.mb_y= 0;
 364     c->skip= 0;
 365
 366     assert(c->  stride ==   stride);
 367     assert(c->uvstride == uvstride);
 368
 369     c->penalty_factor    = get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_cmp);
 370     c->sub_penalty_factor= get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_sub_cmp);
 371     c->mb_penalty_factor = get_penalty_factor(s->lambda, s->lambda2, c->avctx->mb_cmp);
 372     c->current_mv_penalty= c->mv_penalty[s->m.f_code=1] + MAX_MV;
 373
 374     c->xmin = - x*block_w - 16+3;
 375     c->ymin = - y*block_w - 16+3;
 376     c->xmax = - (x+1)*block_w + (w<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3;
 377     c->ymax = - (y+1)*block_w + (h<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3;
 378
 379     if(P_LEFT[0]     > (c->xmax<<shift)) P_LEFT[0]    = (c->xmax<<shift);
 380     if(P_LEFT[1]     > (c->ymax<<shift)) P_LEFT[1]    = (c->ymax<<shift);
 381     if(P_TOP[0]      > (c->xmax<<shift)) P_TOP[0]     = (c->xmax<<shift);
 382     if(P_TOP[1]      > (c->ymax<<shift)) P_TOP[1]     = (c->ymax<<shift);
 383     if(P_TOPRIGHT[0] < (c->xmin<<shift)) P_TOPRIGHT[0]= (c->xmin<<shift);
 384     if(P_TOPRIGHT[0] > (c->xmax<<shift)) P_TOPRIGHT[0]= (c->xmax<<shift); //due to pmx no clip
 385     if(P_TOPRIGHT[1] > (c->ymax<<shift)) P_TOPRIGHT[1]= (c->ymax<<shift);
 386
 387     P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
 388     P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);
 389
 390     if (!y) {
 391         c->pred_x= P_LEFT[0];
 392         c->pred_y= P_LEFT[1];
 393     } else {
 394         c->pred_x = P_MEDIAN[0];
 395         c->pred_y = P_MEDIAN[1];
 396     }
 397
 398     score= INT_MAX;
 399     best_ref= 0;
 400     for(ref=0; ref<s->ref_frames; ref++){
 401         init_ref(c, current_data, s->last_picture[ref].data, NULL, block_w*x, block_w*y, 0);
 402
 403         ref_score= ff_epzs_motion_search(&s->m, &ref_mx, &ref_my, P, 0, /*ref_index*/ 0, last_mv,
 404                                          (1<<16)>>shift, level-LOG2_MB_SIZE+4, block_w);
 405
 406         assert(ref_mx >= c->xmin);
 407         assert(ref_mx <= c->xmax);
 408         assert(ref_my >= c->ymin);
 409         assert(ref_my <= c->ymax);
 410
 411         ref_score= c->sub_motion_search(&s->m, &ref_mx, &ref_my, ref_score, 0, 0, level-LOG2_MB_SIZE+4, block_w);
 412         ref_score= ff_get_mb_score(&s->m, ref_mx, ref_my, 0, 0, level-LOG2_MB_SIZE+4, block_w, 0);
 413         ref_score+= 2*av_log2(2*ref)*c->penalty_factor;
 414         if(s->ref_mvs[ref]){
 415             s->ref_mvs[ref][index][0]= ref_mx;
 416             s->ref_mvs[ref][index][1]= ref_my;
 417             s->ref_scores[ref][index]= ref_score;
 418         }
 419         if(score > ref_score){
 420             score= ref_score;
 421             best_ref= ref;
 422             mx= ref_mx;
 423             my= ref_my;
 424         }
 425     }
 426     //FIXME if mb_cmp != SSE then intra cannot be compared currently and mb_penalty vs. lambda2
 427
 428   //  subpel search
 429     base_bits= get_rac_count(&s->c) - 8*(s->c.bytestream - s->c.bytestream_start);
 430     pc= s->c;
 431     pc.bytestream_start=
 432     pc.bytestream= p_buffer; //FIXME end/start? and at the other stoo
 433     memcpy(p_state, s->block_state, sizeof(s->block_state));
 434
 435     if(level!=s->block_max_depth)
 436         put_rac(&pc, &p_state[4 + s_context], 1);
 437     put_rac(&pc, &p_state[1 + left->type + top->type], 0);
 438     if(s->ref_frames > 1)
 439         put_symbol(&pc, &p_state[128 + 1024 + 32*ref_context], best_ref, 0);
 440     pred_mv(s, &pmx, &pmy, best_ref, left, top, tr);
 441     put_symbol(&pc, &p_state[128 + 32*(mx_context + 16*!!best_ref)], mx - pmx, 1);
 442     put_symbol(&pc, &p_state[128 + 32*(my_context + 16*!!best_ref)], my - pmy, 1);
 443     p_len= pc.bytestream - pc.bytestream_start;
 444     score += (s->lambda2*(get_rac_count(&pc)-base_bits))>>FF_LAMBDA_SHIFT;
 445
 446     block_s= block_w*block_w;
 447     sum = pix_sum(current_data[0], stride, block_w);
 448     l= (sum + block_s/2)/block_s;
 449     iscore = pix_norm1(current_data[0], stride, block_w) - 2*l*sum + l*l*block_s;
 450
 451     block_s= block_w*block_w>>2;
 452     sum = pix_sum(current_data[1], uvstride, block_w>>1);
 453     cb= (sum + block_s/2)/block_s;
 454 //    iscore += pix_norm1(&current_mb[1][0], uvstride, block_w>>1) - 2*cb*sum + cb*cb*block_s;
 455     sum = pix_sum(current_data[2], uvstride, block_w>>1);
 456     cr= (sum + block_s/2)/block_s;
 457 //    iscore += pix_norm1(&current_mb[2][0], uvstride, block_w>>1) - 2*cr*sum + cr*cr*block_s;
 458
 459     ic= s->c;
 460     ic.bytestream_start=
 461     ic.bytestream= i_buffer; //FIXME end/start? and at the other stoo
 462     memcpy(i_state, s->block_state, sizeof(s->block_state));
 463     if(level!=s->block_max_depth)
 464         put_rac(&ic, &i_state[4 + s_context], 1);
 465     put_rac(&ic, &i_state[1 + left->type + top->type], 1);
 466     put_symbol(&ic, &i_state[32],  l-pl , 1);
 467     put_symbol(&ic, &i_state[64], cb-pcb, 1);
 468     put_symbol(&ic, &i_state[96], cr-pcr, 1);
 469     i_len= ic.bytestream - ic.bytestream_start;
 470     iscore += (s->lambda2*(get_rac_count(&ic)-base_bits))>>FF_LAMBDA_SHIFT;
 471
 472 //    assert(score==256*256*256*64-1);
 473     assert(iscore < 255*255*256 + s->lambda2*10);
 474     assert(iscore >= 0);
 475     assert(l>=0 && l<=255);
 476     assert(pl>=0 && pl<=255);
 477
 478     if(level==0){
 479         int varc= iscore >> 8;
 480         int vard= score >> 8;
 481         if (vard <= 64 || vard < varc)
 482             c->scene_change_score+= ff_sqrt(vard) - ff_sqrt(varc);
 483         else
 484             c->scene_change_score+= s->m.qscale;
 485     }
 486
 487     if(level!=s->block_max_depth){
 488         put_rac(&s->c, &s->block_state[4 + s_context], 0);
 489         score2 = encode_q_branch(s, level+1, 2*x+0, 2*y+0);
 490         score2+= encode_q_branch(s, level+1, 2*x+1, 2*y+0);
 491         score2+= encode_q_branch(s, level+1, 2*x+0, 2*y+1);
 492         score2+= encode_q_branch(s, level+1, 2*x+1, 2*y+1);
 493         score2+= s->lambda2>>FF_LAMBDA_SHIFT; //FIXME exact split overhead
 494
 495         if(score2 < score && score2 < iscore)
 496             return score2;
 497     }
 498
 499     if(iscore < score){
 500         pred_mv(s, &pmx, &pmy, 0, left, top, tr);
 501         memcpy(pbbak, i_buffer, i_len);
 502         s->c= ic;
 503         s->c.bytestream_start= pbbak_start;
 504         s->c.bytestream= pbbak + i_len;
 505         set_blocks(s, level, x, y, l, cb, cr, pmx, pmy, 0, BLOCK_INTRA);
 506         memcpy(s->block_state, i_state, sizeof(s->block_state));
 507         return iscore;
 508     }else{
 509         memcpy(pbbak, p_buffer, p_len);
 510         s->c= pc;
 511         s->c.bytestream_start= pbbak_start;
 512         s->c.bytestream= pbbak + p_len;
 513         set_blocks(s, level, x, y, pl, pcb, pcr, mx, my, best_ref, 0);
 514         memcpy(s->block_state, p_state, sizeof(s->block_state));
 515         return score;
 516     }
 517 }
 518
 519 static void encode_q_branch2(SnowContext *s, int level, int x, int y){
 520     const int w= s->b_width  << s->block_max_depth;
 521     const int rem_depth= s->block_max_depth - level;
 522     const int index= (x + y*w) << rem_depth;
 523     int trx= (x+1)<<rem_depth;
 524     BlockNode *b= &s->block[index];
 525     const BlockNode *left  = x ? &s->block[index-1] : &null_block;
 526     const BlockNode *top   = y ? &s->block[index-w] : &null_block;
 527     const BlockNode *tl    = y && x ? &s->block[index-w-1] : left;
 528     const BlockNode *tr    = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
 529     int pl = left->color[0];
 530     int pcb= left->color[1];
 531     int pcr= left->color[2];
 532     int pmx, pmy;
 533     int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
 534     int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 16*!!b->ref;
 535     int my_context= av_log2(2*FFABS(left->my - top->my)) + 16*!!b->ref;
 536     int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
 537
 538     if(s->keyframe){
 539         set_blocks(s, level, x, y, pl, pcb, pcr, 0, 0, 0, BLOCK_INTRA);
 540         return;
 541     }
 542
 543     if(level!=s->block_max_depth){
 544         if(same_block(b,b+1) && same_block(b,b+w) && same_block(b,b+w+1)){
 545             put_rac(&s->c, &s->block_state[4 + s_context], 1);
 546         }else{
 547             put_rac(&s->c, &s->block_state[4 + s_context], 0);
 548             encode_q_branch2(s, level+1, 2*x+0, 2*y+0);
 549             encode_q_branch2(s, level+1, 2*x+1, 2*y+0);
 550             encode_q_branch2(s, level+1, 2*x+0, 2*y+1);
 551             encode_q_branch2(s, level+1, 2*x+1, 2*y+1);
 552             return;
 553         }
 554     }
 555     if(b->type & BLOCK_INTRA){
 556         pred_mv(s, &pmx, &pmy, 0, left, top, tr);
 557         put_rac(&s->c, &s->block_state[1 + (left->type&1) + (top->type&1)], 1);
 558         put_symbol(&s->c, &s->block_state[32], b->color[0]-pl , 1);
 559         put_symbol(&s->c, &s->block_state[64], b->color[1]-pcb, 1);
 560         put_symbol(&s->c, &s->block_state[96], b->color[2]-pcr, 1);
 561         set_blocks(s, level, x, y, b->color[0], b->color[1], b->color[2], pmx, pmy, 0, BLOCK_INTRA);
 562     }else{
 563         pred_mv(s, &pmx, &pmy, b->ref, left, top, tr);
 564         put_rac(&s->c, &s->block_state[1 + (left->type&1) + (top->type&1)], 0);
 565         if(s->ref_frames > 1)
 566             put_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], b->ref, 0);
 567         put_symbol(&s->c, &s->block_state[128 + 32*mx_context], b->mx - pmx, 1);
 568         put_symbol(&s->c, &s->block_state[128 + 32*my_context], b->my - pmy, 1);
 569         set_blocks(s, level, x, y, pl, pcb, pcr, b->mx, b->my, b->ref, 0);
 570     }
 571 }
 572
 573 static int get_dc(SnowContext *s, int mb_x, int mb_y, int plane_index){
 574     int i, x2, y2;
 575     Plane *p= &s->plane[plane_index];
 576     const int block_size = MB_SIZE >> s->block_max_depth;
 577     const int block_w    = plane_index ? block_size/2 : block_size;
 578     const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+1] : ff_obmc_tab[s->block_max_depth];
 579     const int obmc_stride= plane_index ? block_size : 2*block_size;
 580     const int ref_stride= s->current_picture.linesize[plane_index];
 581     uint8_t *src= s-> input_picture.data[plane_index];
 582     IDWTELEM *dst= (IDWTELEM*)s->m.obmc_scratchpad + plane_index*block_size*block_size*4; //FIXME change to unsigned
 583     const int b_stride = s->b_width << s->block_max_depth;
 584     const int w= p->width;
 585     const int h= p->height;
 586     int index= mb_x + mb_y*b_stride;
 587     BlockNode *b= &s->block[index];
 588     BlockNode backup= *b;
 589     int ab=0;
 590     int aa=0;
 591
 592     b->type|= BLOCK_INTRA;
 593     b->color[plane_index]= 0;
 594     memset(dst, 0, obmc_stride*obmc_stride*sizeof(IDWTELEM));
 595
 596     for(i=0; i<4; i++){
 597         int mb_x2= mb_x + (i &1) - 1;
 598         int mb_y2= mb_y + (i>>1) - 1;
 599         int x= block_w*mb_x2 + block_w/2;
 600         int y= block_w*mb_y2 + block_w/2;
 601
 602         add_yblock(s, 0, NULL, dst + ((i&1)+(i>>1)*obmc_stride)*block_w, NULL, obmc,
 603                     x, y, block_w, block_w, w, h, obmc_stride, ref_stride, obmc_stride, mb_x2, mb_y2, 0, 0, plane_index);
 604
 605         for(y2= FFMAX(y, 0); y2<FFMIN(h, y+block_w); y2++){
 606             for(x2= FFMAX(x, 0); x2<FFMIN(w, x+block_w); x2++){
 607                 int index= x2-(block_w*mb_x - block_w/2) + (y2-(block_w*mb_y - block_w/2))*obmc_stride;
 608                 int obmc_v= obmc[index];
 609                 int d;
 610                 if(y<0) obmc_v += obmc[index + block_w*obmc_stride];
 611                 if(x<0) obmc_v += obmc[index + block_w];
 612                 if(y+block_w>h) obmc_v += obmc[index - block_w*obmc_stride];
 613                 if(x+block_w>w) obmc_v += obmc[index - block_w];
 614                 //FIXME precalculate this or simplify it somehow else
 615
 616                 d = -dst[index] + (1<<(FRAC_BITS-1));
 617                 dst[index] = d;
 618                 ab += (src[x2 + y2*ref_stride] - (d>>FRAC_BITS)) * obmc_v;
 619                 aa += obmc_v * obmc_v; //FIXME precalculate this
 620             }
 621         }
 622     }
 623     *b= backup;
 624
 625     return av_clip(((ab<<LOG2_OBMC_MAX) + aa/2)/aa, 0, 255); //FIXME we should not need clipping
 626 }
 627
 628 static inline int get_block_bits(SnowContext *s, int x, int y, int w){
 629     const int b_stride = s->b_width << s->block_max_depth;
 630     const int b_height = s->b_height<< s->block_max_depth;
 631     int index= x + y*b_stride;
 632     const BlockNode *b     = &s->block[index];
 633     const BlockNode *left  = x ? &s->block[index-1] : &null_block;
 634     const BlockNode *top   = y ? &s->block[index-b_stride] : &null_block;
 635     const BlockNode *tl    = y && x ? &s->block[index-b_stride-1] : left;
 636     const BlockNode *tr    = y && x+w<b_stride ? &s->block[index-b_stride+w] : tl;
 637     int dmx, dmy;
 638 //  int mx_context= av_log2(2*FFABS(left->mx - top->mx));
 639 //  int my_context= av_log2(2*FFABS(left->my - top->my));
 640
 641     if(x<0 || x>=b_stride || y>=b_height)
 642         return 0;
 643 /*
 644 1            0      0
 645 01X          1-2    1
 646 001XX        3-6    2-3
 647 0001XXX      7-14   4-7
 648 00001XXXX   15-30   8-15
 649 */
 650 //FIXME try accurate rate
 651 //FIXME intra and inter predictors if surrounding blocks are not the same type
 652     if(b->type & BLOCK_INTRA){
 653         return 3+2*( av_log2(2*FFABS(left->color[0] - b->color[0]))
 654                    + av_log2(2*FFABS(left->color[1] - b->color[1]))
 655                    + av_log2(2*FFABS(left->color[2] - b->color[2])));
 656     }else{
 657         pred_mv(s, &dmx, &dmy, b->ref, left, top, tr);
 658         dmx-= b->mx;
 659         dmy-= b->my;
 660         return 2*(1 + av_log2(2*FFABS(dmx)) //FIXME kill the 2* can be merged in lambda
 661                     + av_log2(2*FFABS(dmy))
 662                     + av_log2(2*b->ref));
 663     }
 664 }
 665
 666 static int get_block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index, const uint8_t *obmc_edged){
 667     Plane *p= &s->plane[plane_index];
 668     const int block_size = MB_SIZE >> s->block_max_depth;
 669     const int block_w    = plane_index ? block_size/2 : block_size;
 670     const int obmc_stride= plane_index ? block_size : 2*block_size;
 671     const int ref_stride= s->current_picture.linesize[plane_index];
 672     uint8_t *dst= s->current_picture.data[plane_index];
 673     uint8_t *src= s->  input_picture.data[plane_index];
 674     IDWTELEM *pred= (IDWTELEM*)s->m.obmc_scratchpad + plane_index*block_size*block_size*4;
 675     uint8_t *cur = s->scratchbuf;
 676     uint8_t tmp[ref_stride*(2*MB_SIZE+HTAPS_MAX-1)];
 677     const int b_stride = s->b_width << s->block_max_depth;
 678     const int b_height = s->b_height<< s->block_max_depth;
 679     const int w= p->width;
 680     const int h= p->height;
 681     int distortion;
 682     int rate= 0;
 683     const int penalty_factor= get_penalty_factor(s->lambda, s->lambda2, s->avctx->me_cmp);
 684     int sx= block_w*mb_x - block_w/2;
 685     int sy= block_w*mb_y - block_w/2;
 686     int x0= FFMAX(0,-sx);
 687     int y0= FFMAX(0,-sy);
 688     int x1= FFMIN(block_w*2, w-sx);
 689     int y1= FFMIN(block_w*2, h-sy);
 690     int i,x,y;
 691
 692     ff_snow_pred_block(s, cur, tmp, ref_stride, sx, sy, block_w*2, block_w*2, &s->block[mb_x + mb_y*b_stride], plane_index, w, h);
 693
 694     for(y=y0; y<y1; y++){
 695         const uint8_t *obmc1= obmc_edged + y*obmc_stride;
 696         const IDWTELEM *pred1 = pred + y*obmc_stride;
 697         uint8_t *cur1 = cur + y*ref_stride;
 698         uint8_t *dst1 = dst + sx + (sy+y)*ref_stride;
 699         for(x=x0; x<x1; x++){
 700 #if FRAC_BITS >= LOG2_OBMC_MAX
 701             int v = (cur1[x] * obmc1[x]) << (FRAC_BITS - LOG2_OBMC_MAX);
 702 #else
 703             int v = (cur1[x] * obmc1[x] + (1<<(LOG2_OBMC_MAX - FRAC_BITS-1))) >> (LOG2_OBMC_MAX - FRAC_BITS);
 704 #endif
 705             v = (v + pred1[x]) >> FRAC_BITS;
 706             if(v&(~255)) v= ~(v>>31);
 707             dst1[x] = v;
 708         }
 709     }
 710
 711     /* copy the regions where obmc[] = (uint8_t)256 */
 712     if(LOG2_OBMC_MAX == 8
 713         && (mb_x == 0 || mb_x == b_stride-1)
 714         && (mb_y == 0 || mb_y == b_height-1)){
 715         if(mb_x == 0)
 716             x1 = block_w;
 717         else
 718             x0 = block_w;
 719         if(mb_y == 0)
 720             y1 = block_w;
 721         else
 722             y0 = block_w;
 723         for(y=y0; y<y1; y++)
 724             memcpy(dst + sx+x0 + (sy+y)*ref_stride, cur + x0 + y*ref_stride, x1-x0);
 725     }
 726
 727     if(block_w==16){
 728         /* FIXME rearrange dsputil to fit 32x32 cmp functions */
 729         /* FIXME check alignment of the cmp wavelet vs the encoding wavelet */
 730         /* FIXME cmps overlap but do not cover the wavelet's whole support.
 731          * So improving the score of one block is not strictly guaranteed
 732          * to improve the score of the whole frame, thus iterative motion
 733          * estimation does not always converge. */
 734         if(s->avctx->me_cmp == FF_CMP_W97)
 735             distortion = ff_w97_32_c(&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, 32);
 736         else if(s->avctx->me_cmp == FF_CMP_W53)
 737             distortion = ff_w53_32_c(&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, 32);
 738         else{
 739             distortion = 0;
 740             for(i=0; i<4; i++){
 741                 int off = sx+16*(i&1) + (sy+16*(i>>1))*ref_stride;
 742                 distortion += s->dsp.me_cmp[0](&s->m, src + off, dst + off, ref_stride, 16);
 743             }
 744         }
 745     }else{
 746         assert(block_w==8);
 747         distortion = s->dsp.me_cmp[0](&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, block_w*2);
 748     }
 749
 750     if(plane_index==0){
 751         for(i=0; i<4; i++){
 752 /* ..RRr
 753  * .RXx.
 754  * rxx..
 755  */
 756             rate += get_block_bits(s, mb_x + (i&1) - (i>>1), mb_y + (i>>1), 1);
 757         }
 758         if(mb_x == b_stride-2)
 759             rate += get_block_bits(s, mb_x + 1, mb_y + 1, 1);
 760     }
 761     return distortion + rate*penalty_factor;
 762 }
 763
 764 static int get_4block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index){
 765     int i, y2;
 766     Plane *p= &s->plane[plane_index];
 767     const int block_size = MB_SIZE >> s->block_max_depth;
 768     const int block_w    = plane_index ? block_size/2 : block_size;
 769     const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+1] : ff_obmc_tab[s->block_max_depth];
 770     const int obmc_stride= plane_index ? block_size : 2*block_size;
 771     const int ref_stride= s->current_picture.linesize[plane_index];
 772     uint8_t *dst= s->current_picture.data[plane_index];
 773     uint8_t *src= s-> input_picture.data[plane_index];
 774     //FIXME zero_dst is const but add_yblock changes dst if add is 0 (this is never the case for dst=zero_dst
 775     // const has only been removed from zero_dst to suppress a warning
 776     static IDWTELEM zero_dst[4096]; //FIXME
 777     const int b_stride = s->b_width << s->block_max_depth;
 778     const int w= p->width;
 779     const int h= p->height;
 780     int distortion= 0;
 781     int rate= 0;
 782     const int penalty_factor= get_penalty_factor(s->lambda, s->lambda2, s->avctx->me_cmp);
 783
 784     for(i=0; i<9; i++){
 785         int mb_x2= mb_x + (i%3) - 1;
 786         int mb_y2= mb_y + (i/3) - 1;
 787         int x= block_w*mb_x2 + block_w/2;
 788         int y= block_w*mb_y2 + block_w/2;
 789
 790         add_yblock(s, 0, NULL, zero_dst, dst, obmc,
 791                    x, y, block_w, block_w, w, h, /*dst_stride*/0, ref_stride, obmc_stride, mb_x2, mb_y2, 1, 1, plane_index);
 792
 793         //FIXME find a cleaner/simpler way to skip the outside stuff
 794         for(y2= y; y2<0; y2++)
 795             memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, block_w);
 796         for(y2= h; y2<y+block_w; y2++)
 797             memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, block_w);
 798         if(x<0){
 799             for(y2= y; y2<y+block_w; y2++)
 800                 memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, -x);
 801         }
 802         if(x+block_w > w){
 803             for(y2= y; y2<y+block_w; y2++)
 804                 memcpy(dst + w + y2*ref_stride, src + w + y2*ref_stride, x+block_w - w);
 805         }
 806
 807         assert(block_w== 8 || block_w==16);
 808         distortion += s->dsp.me_cmp[block_w==8](&s->m, src + x + y*ref_stride, dst + x + y*ref_stride, ref_stride, block_w);
 809     }
 810
 811     if(plane_index==0){
 812         BlockNode *b= &s->block[mb_x+mb_y*b_stride];
 813         int merged= same_block(b,b+1) && same_block(b,b+b_stride) && same_block(b,b+b_stride+1);
 814
 815 /* ..RRRr
 816  * .RXXx.
 817  * .RXXx.
 818  * rxxx.
 819  */
 820         if(merged)
 821             rate = get_block_bits(s, mb_x, mb_y, 2);
 822         for(i=merged?4:0; i<9; i++){
 823             static const int dxy[9][2] = {{0,0},{1,0},{0,1},{1,1},{2,0},{2,1},{-1,2},{0,2},{1,2}};
 824             rate += get_block_bits(s, mb_x + dxy[i][0], mb_y + dxy[i][1], 1);
 825         }
 826     }
 827     return distortion + rate*penalty_factor;
 828 }
 829
 830 static int encode_subband_c0run(SnowContext *s, SubBand *b, IDWTELEM *src, IDWTELEM *parent, int stride, int orientation){
 831     const int w= b->width;
 832     const int h= b->height;
 833     int x, y;
 834
 835     if(1){
 836         int run=0;
 837         int runs[w*h];
 838         int run_index=0;
 839         int max_index;
 840
 841         for(y=0; y<h; y++){
 842             for(x=0; x<w; x++){
 843                 int v, p=0;
 844                 int /*ll=0, */l=0, lt=0, t=0, rt=0;
 845                 v= src[x + y*stride];
 846
 847                 if(y){
 848                     t= src[x + (y-1)*stride];
 849                     if(x){
 850                         lt= src[x - 1 + (y-1)*stride];
 851                     }
 852                     if(x + 1 < w){
 853                         rt= src[x + 1 + (y-1)*stride];
 854                     }
 855                 }
 856                 if(x){
 857                     l= src[x - 1 + y*stride];
 858                     /*if(x > 1){
 859                         if(orientation==1) ll= src[y + (x-2)*stride];
 860                         else               ll= src[x - 2 + y*stride];
 861                     }*/
 862                 }
 863                 if(parent){
 864                     int px= x>>1;
 865                     int py= y>>1;
 866                     if(px<b->parent->width && py<b->parent->height)
 867                         p= parent[px + py*2*stride];
 868                 }
 869                 if(!(/*ll|*/l|lt|t|rt|p)){
 870                     if(v){
 871                         runs[run_index++]= run;
 872                         run=0;
 873                     }else{
 874                         run++;
 875                     }
 876                 }
 877             }
 878         }
 879         max_index= run_index;
 880         runs[run_index++]= run;
 881         run_index=0;
 882         run= runs[run_index++];
 883
 884         put_symbol2(&s->c, b->state[30], max_index, 0);
 885         if(run_index <= max_index)
 886             put_symbol2(&s->c, b->state[1], run, 3);
 887
 888         for(y=0; y<h; y++){
 889             if(s->c.bytestream_end - s->c.bytestream < w*40){
 890                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
 891                 return -1;
 892             }
 893             for(x=0; x<w; x++){
 894                 int v, p=0;
 895                 int /*ll=0, */l=0, lt=0, t=0, rt=0;
 896                 v= src[x + y*stride];
 897
 898                 if(y){
 899                     t= src[x + (y-1)*stride];
 900                     if(x){
 901                         lt= src[x - 1 + (y-1)*stride];
 902                     }
 903                     if(x + 1 < w){
 904                         rt= src[x + 1 + (y-1)*stride];
 905                     }
 906                 }
 907                 if(x){
 908                     l= src[x - 1 + y*stride];
 909                     /*if(x > 1){
 910                         if(orientation==1) ll= src[y + (x-2)*stride];
 911                         else               ll= src[x - 2 + y*stride];
 912                     }*/
 913                 }
 914                 if(parent){
 915                     int px= x>>1;
 916                     int py= y>>1;
 917                     if(px<b->parent->width && py<b->parent->height)
 918                         p= parent[px + py*2*stride];
 919                 }
 920                 if(/*ll|*/l|lt|t|rt|p){
 921                     int context= av_log2(/*FFABS(ll) + */3*FFABS(l) + FFABS(lt) + 2*FFABS(t) + FFABS(rt) + FFABS(p));
 922
 923                     put_rac(&s->c, &b->state[0][context], !!v);
 924                 }else{
 925                     if(!run){
 926                         run= runs[run_index++];
 927
 928                         if(run_index <= max_index)
 929                             put_symbol2(&s->c, b->state[1], run, 3);
 930                         assert(v);
 931                     }else{
 932                         run--;
 933                         assert(!v);
 934                     }
 935                 }
 936                 if(v){
 937                     int context= av_log2(/*FFABS(ll) + */3*FFABS(l) + FFABS(lt) + 2*FFABS(t) + FFABS(rt) + FFABS(p));
 938                     int l2= 2*FFABS(l) + (l<0);
 939                     int t2= 2*FFABS(t) + (t<0);
 940
 941                     put_symbol2(&s->c, b->state[context + 2], FFABS(v)-1, context-4);
 942                     put_rac(&s->c, &b->state[0][16 + 1 + 3 + ff_quant3bA[l2&0xFF] + 3*ff_quant3bA[t2&0xFF]], v<0);
 943                 }
 944             }
 945         }
 946     }
 947     return 0;
 948 }
 949
 950 static int encode_subband(SnowContext *s, SubBand *b, IDWTELEM *src, IDWTELEM *parent, int stride, int orientation){
 951 //    encode_subband_qtree(s, b, src, parent, stride, orientation);
 952 //    encode_subband_z0run(s, b, src, parent, stride, orientation);
 953     return encode_subband_c0run(s, b, src, parent, stride, orientation);
 954 //    encode_subband_dzr(s, b, src, parent, stride, orientation);
 955 }
 956
 957 static av_always_inline int check_block(SnowContext *s, int mb_x, int mb_y, int p[3], int intra, const uint8_t *obmc_edged, int *best_rd){
 958     const int b_stride= s->b_width << s->block_max_depth;
 959     BlockNode *block= &s->block[mb_x + mb_y * b_stride];
 960     BlockNode backup= *block;
 961     unsigned value;
 962     int rd, index;
 963
 964     assert(mb_x>=0 && mb_y>=0);
 965     assert(mb_x<b_stride);
 966
 967     if(intra){
 968         block->color[0] = p[0];
 969         block->color[1] = p[1];
 970         block->color[2] = p[2];
 971         block->type |= BLOCK_INTRA;
 972     }else{
 973         index= (p[0] + 31*p[1]) & (ME_CACHE_SIZE-1);
 974         value= s->me_cache_generation + (p[0]>>10) + (p[1]<<6) + (block->ref<<12);
 975         if(s->me_cache[index] == value)
 976             return 0;
 977         s->me_cache[index]= value;
 978
 979         block->mx= p[0];
 980         block->my= p[1];
 981         block->type &= ~BLOCK_INTRA;
 982     }
 983
 984     rd= get_block_rd(s, mb_x, mb_y, 0, obmc_edged);
 985
 986 //FIXME chroma
 987     if(rd < *best_rd){
 988         *best_rd= rd;
 989         return 1;
 990     }else{
 991         *block= backup;
 992         return 0;
 993     }
 994 }
 995
 996 /* special case for int[2] args we discard afterwards,
 997  * fixes compilation problem with gcc 2.95 */
 998 static av_always_inline int check_block_inter(SnowContext *s, int mb_x, int mb_y, int p0, int p1, const uint8_t *obmc_edged, int *best_rd){
 999     int p[2] = {p0, p1};
1000     return check_block(s, mb_x, mb_y, p, 0, obmc_edged, best_rd);
1001 }
1002
1003 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){
1004     const int b_stride= s->b_width << s->block_max_depth;
1005     BlockNode *block= &s->block[mb_x + mb_y * b_stride];
1006     BlockNode backup[4]= {block[0], block[1], block[b_stride], block[b_stride+1]};
1007     unsigned value;
1008     int rd, index;
1009
1010     assert(mb_x>=0 && mb_y>=0);
1011     assert(mb_x<b_stride);
1012     assert(((mb_x|mb_y)&1) == 0);
1013
1014     index= (p0 + 31*p1) & (ME_CACHE_SIZE-1);
1015     value= s->me_cache_generation + (p0>>10) + (p1<<6) + (block->ref<<12);
1016     if(s->me_cache[index] == value)
1017         return 0;
1018     s->me_cache[index]= value;
1019
1020     block->mx= p0;
1021     block->my= p1;
1022     block->ref= ref;
1023     block->type &= ~BLOCK_INTRA;
1024     block[1]= block[b_stride]= block[b_stride+1]= *block;
1025
1026     rd= get_4block_rd(s, mb_x, mb_y, 0);
1027
1028 //FIXME chroma
1029     if(rd < *best_rd){
1030         *best_rd= rd;
1031         return 1;
1032     }else{
1033         block[0]= backup[0];
1034         block[1]= backup[1];
1035         block[b_stride]= backup[2];
1036         block[b_stride+1]= backup[3];
1037         return 0;
1038     }
1039 }
1040
1041 static void iterative_me(SnowContext *s){
1042     int pass, mb_x, mb_y;
1043     const int b_width = s->b_width  << s->block_max_depth;
1044     const int b_height= s->b_height << s->block_max_depth;
1045     const int b_stride= b_width;
1046     int color[3];
1047
1048     {
1049         RangeCoder r = s->c;
1050         uint8_t state[sizeof(s->block_state)];
1051         memcpy(state, s->block_state, sizeof(s->block_state));
1052         for(mb_y= 0; mb_y<s->b_height; mb_y++)
1053             for(mb_x= 0; mb_x<s->b_width; mb_x++)
1054                 encode_q_branch(s, 0, mb_x, mb_y);
1055         s->c = r;
1056         memcpy(s->block_state, state, sizeof(s->block_state));
1057     }
1058
1059     for(pass=0; pass<25; pass++){
1060         int change= 0;
1061
1062         for(mb_y= 0; mb_y<b_height; mb_y++){
1063             for(mb_x= 0; mb_x<b_width; mb_x++){
1064                 int dia_change, i, j, ref;
1065                 int best_rd= INT_MAX, ref_rd;
1066                 BlockNode backup, ref_b;
1067                 const int index= mb_x + mb_y * b_stride;
1068                 BlockNode *block= &s->block[index];
1069                 BlockNode *tb =                   mb_y            ? &s->block[index-b_stride  ] : NULL;
1070                 BlockNode *lb = mb_x                              ? &s->block[index         -1] : NULL;
1071                 BlockNode *rb = mb_x+1<b_width                    ? &s->block[index         +1] : NULL;
1072                 BlockNode *bb =                   mb_y+1<b_height ? &s->block[index+b_stride  ] : NULL;
1073                 BlockNode *tlb= mb_x           && mb_y            ? &s->block[index-b_stride-1] : NULL;
1074                 BlockNode *trb= mb_x+1<b_width && mb_y            ? &s->block[index-b_stride+1] : NULL;
1075                 BlockNode *blb= mb_x           && mb_y+1<b_height ? &s->block[index+b_stride-1] : NULL;
1076                 BlockNode *brb= mb_x+1<b_width && mb_y+1<b_height ? &s->block[index+b_stride+1] : NULL;
1077                 const int b_w= (MB_SIZE >> s->block_max_depth);
1078                 uint8_t obmc_edged[b_w*2][b_w*2];
1079
1080                 if(pass && (block->type & BLOCK_OPT))
1081                     continue;
1082                 block->type |= BLOCK_OPT;
1083
1084                 backup= *block;
1085
1086                 if(!s->me_cache_generation)
1087                     memset(s->me_cache, 0, sizeof(s->me_cache));
1088                 s->me_cache_generation += 1<<22;
1089
1090                 //FIXME precalculate
1091                 {
1092                     int x, y;
1093                     memcpy(obmc_edged, ff_obmc_tab[s->block_max_depth], b_w*b_w*4);
1094                     if(mb_x==0)
1095                         for(y=0; y<b_w*2; y++)
1096                             memset(obmc_edged[y], obmc_edged[y][0] + obmc_edged[y][b_w-1], b_w);
1097                     if(mb_x==b_stride-1)
1098                         for(y=0; y<b_w*2; y++)
1099                             memset(obmc_edged[y]+b_w, obmc_edged[y][b_w] + obmc_edged[y][b_w*2-1], b_w);
1100                     if(mb_y==0){
1101                         for(x=0; x<b_w*2; x++)
1102                             obmc_edged[0][x] += obmc_edged[b_w-1][x];
1103                         for(y=1; y<b_w; y++)
1104                             memcpy(obmc_edged[y], obmc_edged[0], b_w*2);
1105                     }
1106                     if(mb_y==b_height-1){
1107                         for(x=0; x<b_w*2; x++)
1108                             obmc_edged[b_w*2-1][x] += obmc_edged[b_w][x];
1109                         for(y=b_w; y<b_w*2-1; y++)
1110                             memcpy(obmc_edged[y], obmc_edged[b_w*2-1], b_w*2);
1111                     }
1112                 }
1113
1114                 //skip stuff outside the picture
1115                 if(mb_x==0 || mb_y==0 || mb_x==b_width-1 || mb_y==b_height-1){
1116                     uint8_t *src= s->  input_picture.data[0];
1117                     uint8_t *dst= s->current_picture.data[0];
1118                     const int stride= s->current_picture.linesize[0];
1119                     const int block_w= MB_SIZE >> s->block_max_depth;
1120                     const int sx= block_w*mb_x - block_w/2;
1121                     const int sy= block_w*mb_y - block_w/2;
1122                     const int w= s->plane[0].width;
1123                     const int h= s->plane[0].height;
1124                     int y;
1125
1126                     for(y=sy; y<0; y++)
1127                         memcpy(dst + sx + y*stride, src + sx + y*stride, block_w*2);
1128                     for(y=h; y<sy+block_w*2; y++)
1129                         memcpy(dst + sx + y*stride, src + sx + y*stride, block_w*2);
1130                     if(sx<0){
1131                         for(y=sy; y<sy+block_w*2; y++)
1132                             memcpy(dst + sx + y*stride, src + sx + y*stride, -sx);
1133                     }
1134                     if(sx+block_w*2 > w){
1135                         for(y=sy; y<sy+block_w*2; y++)
1136                             memcpy(dst + w + y*stride, src + w + y*stride, sx+block_w*2 - w);
1137                     }
1138                 }
1139
1140                 // intra(black) = neighbors' contribution to the current block
1141                 for(i=0; i<3; i++)
1142                     color[i]= get_dc(s, mb_x, mb_y, i);
1143
1144                 // get previous score (cannot be cached due to OBMC)
1145                 if(pass > 0 && (block->type&BLOCK_INTRA)){
1146                     int color0[3]= {block->color[0], block->color[1], block->color[2]};
1147                     check_block(s, mb_x, mb_y, color0, 1, *obmc_edged, &best_rd);
1148                 }else
1149                     check_block_inter(s, mb_x, mb_y, block->mx, block->my, *obmc_edged, &best_rd);
1150
1151                 ref_b= *block;
1152                 ref_rd= best_rd;
1153                 for(ref=0; ref < s->ref_frames; ref++){
1154                     int16_t (*mvr)[2]= &s->ref_mvs[ref][index];
1155                     if(s->ref_scores[ref][index] > s->ref_scores[ref_b.ref][index]*3/2) //FIXME tune threshold
1156                         continue;
1157                     block->ref= ref;
1158                     best_rd= INT_MAX;
1159
1160                     check_block_inter(s, mb_x, mb_y, mvr[0][0], mvr[0][1], *obmc_edged, &best_rd);
1161                     check_block_inter(s, mb_x, mb_y, 0, 0, *obmc_edged, &best_rd);
1162                     if(tb)
1163                         check_block_inter(s, mb_x, mb_y, mvr[-b_stride][0], mvr[-b_stride][1], *obmc_edged, &best_rd);
1164                     if(lb)
1165                         check_block_inter(s, mb_x, mb_y, mvr[-1][0], mvr[-1][1], *obmc_edged, &best_rd);
1166                     if(rb)
1167                         check_block_inter(s, mb_x, mb_y, mvr[1][0], mvr[1][1], *obmc_edged, &best_rd);
1168                     if(bb)
1169                         check_block_inter(s, mb_x, mb_y, mvr[b_stride][0], mvr[b_stride][1], *obmc_edged, &best_rd);
1170
1171                     /* fullpel ME */
1172                     //FIXME avoid subpel interpolation / round to nearest integer
1173                     do{
1174                         dia_change=0;
1175                         for(i=0; i<FFMAX(s->avctx->dia_size, 1); i++){
1176                             for(j=0; j<i; j++){
1177                                 dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+4*(i-j), block->my+(4*j), *obmc_edged, &best_rd);
1178                                 dia_change |= check_block_inter(s, mb_x, mb_y, block->mx-4*(i-j), block->my-(4*j), *obmc_edged, &best_rd);
1179                                 dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+4*(i-j), block->my-(4*j), *obmc_edged, &best_rd);
1180                                 dia_change |= check_block_inter(s, mb_x, mb_y, block->mx-4*(i-j), block->my+(4*j), *obmc_edged, &best_rd);
1181                             }
1182                         }
1183                     }while(dia_change);
1184                     /* subpel ME */
1185                     do{
1186                         static const int square[8][2]= {{+1, 0},{-1, 0},{ 0,+1},{ 0,-1},{+1,+1},{-1,-1},{+1,-1},{-1,+1},};
1187                         dia_change=0;
1188                         for(i=0; i<8; i++)
1189                             dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+square[i][0], block->my+square[i][1], *obmc_edged, &best_rd);
1190                     }while(dia_change);
1191                     //FIXME or try the standard 2 pass qpel or similar
1192
1193                     mvr[0][0]= block->mx;
1194                     mvr[0][1]= block->my;
1195                     if(ref_rd > best_rd){
1196                         ref_rd= best_rd;
1197                         ref_b= *block;
1198                     }
1199                 }
1200                 best_rd= ref_rd;
1201                 *block= ref_b;
1202                 check_block(s, mb_x, mb_y, color, 1, *obmc_edged, &best_rd);
1203                 //FIXME RD style color selection
1204                 if(!same_block(block, &backup)){
1205                     if(tb ) tb ->type &= ~BLOCK_OPT;
1206                     if(lb ) lb ->type &= ~BLOCK_OPT;
1207                     if(rb ) rb ->type &= ~BLOCK_OPT;
1208                     if(bb ) bb ->type &= ~BLOCK_OPT;
1209                     if(tlb) tlb->type &= ~BLOCK_OPT;
1210                     if(trb) trb->type &= ~BLOCK_OPT;
1211                     if(blb) blb->type &= ~BLOCK_OPT;
1212                     if(brb) brb->type &= ~BLOCK_OPT;
1213                     change ++;
1214                 }
1215             }
1216         }
1217         av_log(s->avctx, AV_LOG_ERROR, "pass:%d changed:%d\n", pass, change);
1218         if(!change)
1219             break;
1220     }
1221
1222     if(s->block_max_depth == 1){
1223         int change= 0;
1224         for(mb_y= 0; mb_y<b_height; mb_y+=2){
1225             for(mb_x= 0; mb_x<b_width; mb_x+=2){
1226                 int i;
1227                 int best_rd, init_rd;
1228                 const int index= mb_x + mb_y * b_stride;
1229                 BlockNode *b[4];
1230
1231                 b[0]= &s->block[index];
1232                 b[1]= b[0]+1;
1233                 b[2]= b[0]+b_stride;
1234                 b[3]= b[2]+1;
1235                 if(same_block(b[0], b[1]) &&
1236                    same_block(b[0], b[2]) &&
1237                    same_block(b[0], b[3]))
1238                     continue;
1239
1240                 if(!s->me_cache_generation)
1241                     memset(s->me_cache, 0, sizeof(s->me_cache));
1242                 s->me_cache_generation += 1<<22;
1243
1244                 init_rd= best_rd= get_4block_rd(s, mb_x, mb_y, 0);
1245
1246                 //FIXME more multiref search?
1247                 check_4block_inter(s, mb_x, mb_y,
1248                                    (b[0]->mx + b[1]->mx + b[2]->mx + b[3]->mx + 2) >> 2,
1249                                    (b[0]->my + b[1]->my + b[2]->my + b[3]->my + 2) >> 2, 0, &best_rd);
1250
1251                 for(i=0; i<4; i++)
1252                     if(!(b[i]->type&BLOCK_INTRA))
1253                         check_4block_inter(s, mb_x, mb_y, b[i]->mx, b[i]->my, b[i]->ref, &best_rd);
1254
1255                 if(init_rd != best_rd)
1256                     change++;
1257             }
1258         }
1259         av_log(s->avctx, AV_LOG_ERROR, "pass:4mv changed:%d\n", change*4);
1260     }
1261 }
1262
1263 static void encode_blocks(SnowContext *s, int search){
1264     int x, y;
1265     int w= s->b_width;
1266     int h= s->b_height;
1267
1268     if(s->avctx->me_method == ME_ITER && !s->keyframe && search)
1269         iterative_me(s);
1270
1271     for(y=0; y<h; y++){
1272         if(s->c.bytestream_end - s->c.bytestream < w*MB_SIZE*MB_SIZE*3){ //FIXME nicer limit
1273             av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
1274             return;
1275         }
1276         for(x=0; x<w; x++){
1277             if(s->avctx->me_method == ME_ITER || !search)
1278                 encode_q_branch2(s, 0, x, y);
1279             else
1280                 encode_q_branch (s, 0, x, y);
1281         }
1282     }
1283 }
1284
1285 static void quantize(SnowContext *s, SubBand *b, IDWTELEM *dst, DWTELEM *src, int stride, int bias){
1286     const int w= b->width;
1287     const int h= b->height;
1288     const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
1289     const int qmul= ff_qexp[qlog&(QROOT-1)]<<((qlog>>QSHIFT) + ENCODER_EXTRA_BITS);
1290     int x,y, thres1, thres2;
1291
1292     if(s->qlog == LOSSLESS_QLOG){
1293         for(y=0; y<h; y++)
1294             for(x=0; x<w; x++)
1295                 dst[x + y*stride]= src[x + y*stride];
1296         return;
1297     }
1298
1299     bias= bias ? 0 : (3*qmul)>>3;
1300     thres1= ((qmul - bias)>>QEXPSHIFT) - 1;
1301     thres2= 2*thres1;
1302
1303     if(!bias){
1304         for(y=0; y<h; y++){
1305             for(x=0; x<w; x++){
1306                 int i= src[x + y*stride];
1307
1308                 if((unsigned)(i+thres1) > thres2){
1309                     if(i>=0){
1310                         i<<= QEXPSHIFT;
1311                         i/= qmul; //FIXME optimize
1312                         dst[x + y*stride]=  i;
1313                     }else{
1314                         i= -i;
1315                         i<<= QEXPSHIFT;
1316                         i/= qmul; //FIXME optimize
1317                         dst[x + y*stride]= -i;
1318                     }
1319                 }else
1320                     dst[x + y*stride]= 0;
1321             }
1322         }
1323     }else{
1324         for(y=0; y<h; y++){
1325             for(x=0; x<w; x++){
1326                 int i= src[x + y*stride];
1327
1328                 if((unsigned)(i+thres1) > thres2){
1329                     if(i>=0){
1330                         i<<= QEXPSHIFT;
1331                         i= (i + bias) / qmul; //FIXME optimize
1332                         dst[x + y*stride]=  i;
1333                     }else{
1334                         i= -i;
1335                         i<<= QEXPSHIFT;
1336                         i= (i + bias) / qmul; //FIXME optimize
1337                         dst[x + y*stride]= -i;
1338                     }
1339                 }else
1340                     dst[x + y*stride]= 0;
1341             }
1342         }
1343     }
1344 }
1345
1346 static void dequantize(SnowContext *s, SubBand *b, IDWTELEM *src, int stride){
1347     const int w= b->width;
1348     const int h= b->height;
1349     const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
1350     const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
1351     const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
1352     int x,y;
1353
1354     if(s->qlog == LOSSLESS_QLOG) return;
1355
1356     for(y=0; y<h; y++){
1357         for(x=0; x<w; x++){
1358             int i= src[x + y*stride];
1359             if(i<0){
1360                 src[x + y*stride]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
1361             }else if(i>0){
1362                 src[x + y*stride]=  (( i*qmul + qadd)>>(QEXPSHIFT));
1363             }
1364         }
1365     }
1366 }
1367
1368 static void decorrelate(SnowContext *s, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median){
1369     const int w= b->width;
1370     const int h= b->height;
1371     int x,y;
1372
1373     for(y=h-1; y>=0; y--){
1374         for(x=w-1; x>=0; x--){
1375             int i= x + y*stride;
1376
1377             if(x){
1378                 if(use_median){
1379                     if(y && x+1<w) src[i] -= mid_pred(src[i - 1], src[i - stride], src[i - stride + 1]);
1380                     else  src[i] -= src[i - 1];
1381                 }else{
1382                     if(y) src[i] -= mid_pred(src[i - 1], src[i - stride], src[i - 1] + src[i - stride] - src[i - 1 - stride]);
1383                     else  src[i] -= src[i - 1];
1384                 }
1385             }else{
1386                 if(y) src[i] -= src[i - stride];
1387             }
1388         }
1389     }
1390 }
1391
1392 static void correlate(SnowContext *s, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median){
1393     const int w= b->width;
1394     const int h= b->height;
1395     int x,y;
1396
1397     for(y=0; y<h; y++){
1398         for(x=0; x<w; x++){
1399             int i= x + y*stride;
1400
1401             if(x){
1402                 if(use_median){
1403                     if(y && x+1<w) src[i] += mid_pred(src[i - 1], src[i - stride], src[i - stride + 1]);
1404                     else  src[i] += src[i - 1];
1405                 }else{
1406                     if(y) src[i] += mid_pred(src[i - 1], src[i - stride], src[i - 1] + src[i - stride] - src[i - 1 - stride]);
1407                     else  src[i] += src[i - 1];
1408                 }
1409             }else{
1410                 if(y) src[i] += src[i - stride];
1411             }
1412         }
1413     }
1414 }
1415
1416 static void encode_qlogs(SnowContext *s){
1417     int plane_index, level, orientation;
1418
1419     for(plane_index=0; plane_index<2; plane_index++){
1420         for(level=0; level<s->spatial_decomposition_count; level++){
1421             for(orientation=level ? 1:0; orientation<4; orientation++){
1422                 if(orientation==2) continue;
1423                 put_symbol(&s->c, s->header_state, s->plane[plane_index].band[level][orientation].qlog, 1);
1424             }
1425         }
1426     }
1427 }
1428
1429 static void encode_header(SnowContext *s){
1430     int plane_index, i;
1431     uint8_t kstate[32];
1432
1433     memset(kstate, MID_STATE, sizeof(kstate));
1434
1435     put_rac(&s->c, kstate, s->keyframe);
1436     if(s->keyframe || s->always_reset){
1437         ff_snow_reset_contexts(s);
1438         s->last_spatial_decomposition_type=
1439         s->last_qlog=
1440         s->last_qbias=
1441         s->last_mv_scale=
1442         s->last_block_max_depth= 0;
1443         for(plane_index=0; plane_index<2; plane_index++){
1444             Plane *p= &s->plane[plane_index];
1445             p->last_htaps=0;
1446             p->last_diag_mc=0;
1447             memset(p->last_hcoeff, 0, sizeof(p->last_hcoeff));
1448         }
1449     }
1450     if(s->keyframe){
1451         put_symbol(&s->c, s->header_state, s->version, 0);
1452         put_rac(&s->c, s->header_state, s->always_reset);
1453         put_symbol(&s->c, s->header_state, s->temporal_decomposition_type, 0);
1454         put_symbol(&s->c, s->header_state, s->temporal_decomposition_count, 0);
1455         put_symbol(&s->c, s->header_state, s->spatial_decomposition_count, 0);
1456         put_symbol(&s->c, s->header_state, s->colorspace_type, 0);
1457         put_symbol(&s->c, s->header_state, s->chroma_h_shift, 0);
1458         put_symbol(&s->c, s->header_state, s->chroma_v_shift, 0);
1459         put_rac(&s->c, s->header_state, s->spatial_scalability);
1460 //        put_rac(&s->c, s->header_state, s->rate_scalability);
1461         put_symbol(&s->c, s->header_state, s->max_ref_frames-1, 0);
1462
1463         encode_qlogs(s);
1464     }
1465
1466     if(!s->keyframe){
1467         int update_mc=0;
1468         for(plane_index=0; plane_index<2; plane_index++){
1469             Plane *p= &s->plane[plane_index];
1470             update_mc |= p->last_htaps   != p->htaps;
1471             update_mc |= p->last_diag_mc != p->diag_mc;
1472             update_mc |= !!memcmp(p->last_hcoeff, p->hcoeff, sizeof(p->hcoeff));
1473         }
1474         put_rac(&s->c, s->header_state, update_mc);
1475         if(update_mc){
1476             for(plane_index=0; plane_index<2; plane_index++){
1477                 Plane *p= &s->plane[plane_index];
1478                 put_rac(&s->c, s->header_state, p->diag_mc);
1479                 put_symbol(&s->c, s->header_state, p->htaps/2-1, 0);
1480                 for(i= p->htaps/2; i; i--)
1481                     put_symbol(&s->c, s->header_state, FFABS(p->hcoeff[i]), 0);
1482             }
1483         }
1484         if(s->last_spatial_decomposition_count != s->spatial_decomposition_count){
1485             put_rac(&s->c, s->header_state, 1);
1486             put_symbol(&s->c, s->header_state, s->spatial_decomposition_count, 0);
1487             encode_qlogs(s);
1488         }else
1489             put_rac(&s->c, s->header_state, 0);
1490     }
1491
1492     put_symbol(&s->c, s->header_state, s->spatial_decomposition_type - s->last_spatial_decomposition_type, 1);
1493     put_symbol(&s->c, s->header_state, s->qlog            - s->last_qlog    , 1);
1494     put_symbol(&s->c, s->header_state, s->mv_scale        - s->last_mv_scale, 1);
1495     put_symbol(&s->c, s->header_state, s->qbias           - s->last_qbias   , 1);
1496     put_symbol(&s->c, s->header_state, s->block_max_depth - s->last_block_max_depth, 1);
1497
1498 }
1499
1500 static void update_last_header_values(SnowContext *s){
1501     int plane_index;
1502
1503     if(!s->keyframe){
1504         for(plane_index=0; plane_index<2; plane_index++){
1505             Plane *p= &s->plane[plane_index];
1506             p->last_diag_mc= p->diag_mc;
1507             p->last_htaps  = p->htaps;
1508             memcpy(p->last_hcoeff, p->hcoeff, sizeof(p->hcoeff));
1509         }
1510     }
1511
1512     s->last_spatial_decomposition_type  = s->spatial_decomposition_type;
1513     s->last_qlog                        = s->qlog;
1514     s->last_qbias                       = s->qbias;
1515     s->last_mv_scale                    = s->mv_scale;
1516     s->last_block_max_depth             = s->block_max_depth;
1517     s->last_spatial_decomposition_count = s->spatial_decomposition_count;
1518 }
1519
1520 static int qscale2qlog(int qscale){
1521     return rint(QROOT*log(qscale / (float)FF_QP2LAMBDA)/log(2))
1522            + 61*QROOT/8; ///< 64 > 60
1523 }
1524
1525 static int ratecontrol_1pass(SnowContext *s, AVFrame *pict)
1526 {
1527     /* Estimate the frame's complexity as a sum of weighted dwt coefficients.
1528      * FIXME we know exact mv bits at this point,
1529      * but ratecontrol isn't set up to include them. */
1530     uint32_t coef_sum= 0;
1531     int level, orientation, delta_qlog;
1532
1533     for(level=0; level<s->spatial_decomposition_count; level++){
1534         for(orientation=level ? 1 : 0; orientation<4; orientation++){
1535             SubBand *b= &s->plane[0].band[level][orientation];
1536             IDWTELEM *buf= b->ibuf;
1537             const int w= b->width;
1538             const int h= b->height;
1539             const int stride= b->stride;
1540             const int qlog= av_clip(2*QROOT + b->qlog, 0, QROOT*16);
1541             const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
1542             const int qdiv= (1<<16)/qmul;
1543             int x, y;
1544             //FIXME this is ugly
1545             for(y=0; y<h; y++)
1546                 for(x=0; x<w; x++)
1547                     buf[x+y*stride]= b->buf[x+y*stride];
1548             if(orientation==0)
1549                 decorrelate(s, b, buf, stride, 1, 0);
1550             for(y=0; y<h; y++)
1551                 for(x=0; x<w; x++)
1552                     coef_sum+= abs(buf[x+y*stride]) * qdiv >> 16;
1553         }
1554     }
1555
1556     /* ugly, ratecontrol just takes a sqrt again */
1557     coef_sum = (uint64_t)coef_sum * coef_sum >> 16;
1558     assert(coef_sum < INT_MAX);
1559
1560     if(pict->pict_type == AV_PICTURE_TYPE_I){
1561         s->m.current_picture.mb_var_sum= coef_sum;
1562         s->m.current_picture.mc_mb_var_sum= 0;
1563     }else{
1564         s->m.current_picture.mc_mb_var_sum= coef_sum;
1565         s->m.current_picture.mb_var_sum= 0;
1566     }
1567
1568     pict->quality= ff_rate_estimate_qscale(&s->m, 1);
1569     if (pict->quality < 0)
1570         return INT_MIN;
1571     s->lambda= pict->quality * 3/2;
1572     delta_qlog= qscale2qlog(pict->quality) - s->qlog;
1573     s->qlog+= delta_qlog;
1574     return delta_qlog;
1575 }
1576
1577 static void calculate_visual_weight(SnowContext *s, Plane *p){
1578     int width = p->width;
1579     int height= p->height;
1580     int level, orientation, x, y;
1581
1582     for(level=0; level<s->spatial_decomposition_count; level++){
1583         for(orientation=level ? 1 : 0; orientation<4; orientation++){
1584             SubBand *b= &p->band[level][orientation];
1585             IDWTELEM *ibuf= b->ibuf;
1586             int64_t error=0;
1587
1588             memset(s->spatial_idwt_buffer, 0, sizeof(*s->spatial_idwt_buffer)*width*height);
1589             ibuf[b->width/2 + b->height/2*b->stride]= 256*16;
1590             ff_spatial_idwt(s->spatial_idwt_buffer, width, height, width, s->spatial_decomposition_type, s->spatial_decomposition_count);
1591             for(y=0; y<height; y++){
1592                 for(x=0; x<width; x++){
1593                     int64_t d= s->spatial_idwt_buffer[x + y*width]*16;
1594                     error += d*d;
1595                 }
1596             }
1597
1598             b->qlog= (int)(log(352256.0/sqrt(error)) / log(pow(2.0, 1.0/QROOT))+0.5);
1599         }
1600     }
1601 }
1602
1603 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
1604                         const AVFrame *pict, int *got_packet)
1605 {
1606     SnowContext *s = avctx->priv_data;
1607     RangeCoder * const c= &s->c;
1608     AVFrame *pic = &s->new_picture;
1609     const int width= s->avctx->width;
1610     const int height= s->avctx->height;
1611     int level, orientation, plane_index, i, y, ret;
1612     uint8_t rc_header_bak[sizeof(s->header_state)];
1613     uint8_t rc_block_bak[sizeof(s->block_state)];
1614
1615     if (!pkt->data &&
1616         (ret = av_new_packet(pkt, s->b_width*s->b_height*MB_SIZE*MB_SIZE*3 + FF_MIN_BUFFER_SIZE)) < 0) {
1617         av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
1618         return ret;
1619     }
1620
1621     ff_init_range_encoder(c, pkt->data, pkt->size);
1622     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
1623
1624     for(i=0; i<3; i++){
1625         int shift= !!i;
1626         for(y=0; y<(height>>shift); y++)
1627             memcpy(&s->input_picture.data[i][y * s->input_picture.linesize[i]],
1628                    &pict->data[i][y * pict->linesize[i]],
1629                    width>>shift);
1630     }
1631     s->new_picture = *pict;
1632
1633     s->m.picture_number= avctx->frame_number;
1634     if(avctx->flags&CODEC_FLAG_PASS2){
1635         s->m.pict_type = pic->pict_type = s->m.rc_context.entry[avctx->frame_number].new_pict_type;
1636         s->keyframe = pic->pict_type == AV_PICTURE_TYPE_I;
1637         if(!(avctx->flags&CODEC_FLAG_QSCALE)) {
1638             pic->quality = ff_rate_estimate_qscale(&s->m, 0);
1639             if (pic->quality < 0)
1640                 return -1;
1641         }
1642     }else{
1643         s->keyframe= avctx->gop_size==0 || avctx->frame_number % avctx->gop_size == 0;
1644         s->m.pict_type = pic->pict_type = s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
1645     }
1646
1647     if(s->pass1_rc && avctx->frame_number == 0)
1648         pic->quality = 2*FF_QP2LAMBDA;
1649     if (pic->quality) {
1650         s->qlog   = qscale2qlog(pic->quality);
1651         s->lambda = pic->quality * 3/2;
1652     }
1653     if (s->qlog < 0 || (!pic->quality && (avctx->flags & CODEC_FLAG_QSCALE))) {
1654         s->qlog= LOSSLESS_QLOG;
1655         s->lambda = 0;
1656     }//else keep previous frame's qlog until after motion estimation
1657
1658     ff_snow_frame_start(s);
1659
1660     s->m.current_picture_ptr= &s->m.current_picture;
1661     s->m.last_picture.f.pts = s->m.current_picture.f.pts;
1662     s->m.current_picture.f.pts = pict->pts;
1663     if(pic->pict_type == AV_PICTURE_TYPE_P){
1664         int block_width = (width +15)>>4;
1665         int block_height= (height+15)>>4;
1666         int stride= s->current_picture.linesize[0];
1667
1668         assert(s->current_picture.data[0]);
1669         assert(s->last_picture[0].data[0]);
1670
1671         s->m.avctx= s->avctx;
1672         s->m.current_picture.f.data[0] = s->current_picture.data[0];
1673         s->m.   last_picture.f.data[0] = s->last_picture[0].data[0];
1674         s->m.    new_picture.f.data[0] = s->  input_picture.data[0];
1675         s->m.   last_picture_ptr= &s->m.   last_picture;
1676         s->m.linesize=
1677         s->m.   last_picture.f.linesize[0] =
1678         s->m.    new_picture.f.linesize[0] =
1679         s->m.current_picture.f.linesize[0] = stride;
1680         s->m.uvlinesize= s->current_picture.linesize[1];
1681         s->m.width = width;
1682         s->m.height= height;
1683         s->m.mb_width = block_width;
1684         s->m.mb_height= block_height;
1685         s->m.mb_stride=   s->m.mb_width+1;
1686         s->m.b8_stride= 2*s->m.mb_width+1;
1687         s->m.f_code=1;
1688         s->m.pict_type = pic->pict_type;
1689         s->m.me_method= s->avctx->me_method;
1690         s->m.me.scene_change_score=0;
1691         s->m.flags= s->avctx->flags;
1692         s->m.quarter_sample= (s->avctx->flags & CODEC_FLAG_QPEL)!=0;
1693         s->m.out_format= FMT_H263;
1694         s->m.unrestricted_mv= 1;
1695
1696         s->m.lambda = s->lambda;
1697         s->m.qscale= (s->m.lambda*139 + FF_LAMBDA_SCALE*64) >> (FF_LAMBDA_SHIFT + 7);
1698         s->lambda2= s->m.lambda2= (s->m.lambda*s->m.lambda + FF_LAMBDA_SCALE/2) >> FF_LAMBDA_SHIFT;
1699
1700         s->m.dsp= s->dsp; //move
1701         ff_init_me(&s->m);
1702         s->dsp= s->m.dsp;
1703     }
1704
1705     if(s->pass1_rc){
1706         memcpy(rc_header_bak, s->header_state, sizeof(s->header_state));
1707         memcpy(rc_block_bak, s->block_state, sizeof(s->block_state));
1708     }
1709
1710 redo_frame:
1711
1712     if (pic->pict_type == AV_PICTURE_TYPE_I)
1713         s->spatial_decomposition_count= 5;
1714     else
1715         s->spatial_decomposition_count= 5;
1716
1717     s->m.pict_type = pic->pict_type;
1718     s->qbias = pic->pict_type == AV_PICTURE_TYPE_P ? 2 : 0;
1719
1720     ff_snow_common_init_after_header(avctx);
1721
1722     if(s->last_spatial_decomposition_count != s->spatial_decomposition_count){
1723         for(plane_index=0; plane_index<3; plane_index++){
1724             calculate_visual_weight(s, &s->plane[plane_index]);
1725         }
1726     }
1727
1728     encode_header(s);
1729     s->m.misc_bits = 8*(s->c.bytestream - s->c.bytestream_start);
1730     encode_blocks(s, 1);
1731     s->m.mv_bits = 8*(s->c.bytestream - s->c.bytestream_start) - s->m.misc_bits;
1732
1733     for(plane_index=0; plane_index<3; plane_index++){
1734         Plane *p= &s->plane[plane_index];
1735         int w= p->width;
1736         int h= p->height;
1737         int x, y;
1738 //        int bits= put_bits_count(&s->c.pb);
1739
1740         if (!s->memc_only) {
1741             //FIXME optimize
1742             if(pict->data[plane_index]) //FIXME gray hack
1743                 for(y=0; y<h; y++){
1744                     for(x=0; x<w; x++){
1745                         s->spatial_idwt_buffer[y*w + x]= pict->data[plane_index][y*pict->linesize[plane_index] + x]<<FRAC_BITS;
1746                     }
1747                 }
1748             predict_plane(s, s->spatial_idwt_buffer, plane_index, 0);
1749
1750             if(   plane_index==0
1751                && pic->pict_type == AV_PICTURE_TYPE_P
1752                && !(avctx->flags&CODEC_FLAG_PASS2)
1753                && s->m.me.scene_change_score > s->avctx->scenechange_threshold){
1754                 ff_init_range_encoder(c, pkt->data, pkt->size);
1755                 ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
1756                 pic->pict_type= AV_PICTURE_TYPE_I;
1757                 s->keyframe=1;
1758                 s->current_picture.key_frame=1;
1759                 goto redo_frame;
1760             }
1761
1762             if(s->qlog == LOSSLESS_QLOG){
1763                 for(y=0; y<h; y++){
1764                     for(x=0; x<w; x++){
1765                         s->spatial_dwt_buffer[y*w + x]= (s->spatial_idwt_buffer[y*w + x] + (1<<(FRAC_BITS-1))-1)>>FRAC_BITS;
1766                     }
1767                 }
1768             }else{
1769                 for(y=0; y<h; y++){
1770                     for(x=0; x<w; x++){
1771                         s->spatial_dwt_buffer[y*w + x]=s->spatial_idwt_buffer[y*w + x]<<ENCODER_EXTRA_BITS;
1772                     }
1773                 }
1774             }
1775
1776             /*  if(QUANTIZE2)
1777                 dwt_quantize(s, p, s->spatial_dwt_buffer, w, h, w, s->spatial_decomposition_type);
1778             else*/
1779                 ff_spatial_dwt(s->spatial_dwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count);
1780
1781             if(s->pass1_rc && plane_index==0){
1782                 int delta_qlog = ratecontrol_1pass(s, pic);
1783                 if (delta_qlog <= INT_MIN)
1784                     return -1;
1785                 if(delta_qlog){
1786                     //reordering qlog in the bitstream would eliminate this reset
1787                     ff_init_range_encoder(c, pkt->data, pkt->size);
1788                     memcpy(s->header_state, rc_header_bak, sizeof(s->header_state));
1789                     memcpy(s->block_state, rc_block_bak, sizeof(s->block_state));
1790                     encode_header(s);
1791                     encode_blocks(s, 0);
1792                 }
1793             }
1794
1795             for(level=0; level<s->spatial_decomposition_count; level++){
1796                 for(orientation=level ? 1 : 0; orientation<4; orientation++){
1797                     SubBand *b= &p->band[level][orientation];
1798
1799                     if(!QUANTIZE2)
1800                         quantize(s, b, b->ibuf, b->buf, b->stride, s->qbias);
1801                     if(orientation==0)
1802                         decorrelate(s, b, b->ibuf, b->stride, pic->pict_type == AV_PICTURE_TYPE_P, 0);
1803                     encode_subband(s, b, b->ibuf, b->parent ? b->parent->ibuf : NULL, b->stride, orientation);
1804                     assert(b->parent==NULL || b->parent->stride == b->stride*2);
1805                     if(orientation==0)
1806                         correlate(s, b, b->ibuf, b->stride, 1, 0);
1807                 }
1808             }
1809
1810             for(level=0; level<s->spatial_decomposition_count; level++){
1811                 for(orientation=level ? 1 : 0; orientation<4; orientation++){
1812                     SubBand *b= &p->band[level][orientation];
1813
1814                     dequantize(s, b, b->ibuf, b->stride);
1815                 }
1816             }
1817
1818             ff_spatial_idwt(s->spatial_idwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count);
1819             if(s->qlog == LOSSLESS_QLOG){
1820                 for(y=0; y<h; y++){
1821                     for(x=0; x<w; x++){
1822                         s->spatial_idwt_buffer[y*w + x]<<=FRAC_BITS;
1823                     }
1824                 }
1825             }
1826             predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
1827         }else{
1828             //ME/MC only
1829             if(pic->pict_type == AV_PICTURE_TYPE_I){
1830                 for(y=0; y<h; y++){
1831                     for(x=0; x<w; x++){
1832                         s->current_picture.data[plane_index][y*s->current_picture.linesize[plane_index] + x]=
1833                             pict->data[plane_index][y*pict->linesize[plane_index] + x];
1834                     }
1835                 }
1836             }else{
1837                 memset(s->spatial_idwt_buffer, 0, sizeof(IDWTELEM)*w*h);
1838                 predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
1839             }
1840         }
1841         if(s->avctx->flags&CODEC_FLAG_PSNR){
1842             int64_t error= 0;
1843
1844             if(pict->data[plane_index]) //FIXME gray hack
1845                 for(y=0; y<h; y++){
1846                     for(x=0; x<w; x++){
1847                         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];
1848                         error += d*d;
1849                     }
1850                 }
1851             s->avctx->error[plane_index] += error;
1852             s->current_picture.error[plane_index] = error;
1853         }
1854
1855     }
1856
1857     update_last_header_values(s);
1858
1859     ff_snow_release_buffer(avctx);
1860
1861     s->current_picture.coded_picture_number = avctx->frame_number;
1862     s->current_picture.pict_type = pict->pict_type;
1863     s->current_picture.quality = pict->quality;
1864     s->m.frame_bits = 8*(s->c.bytestream - s->c.bytestream_start);
1865     s->m.p_tex_bits = s->m.frame_bits - s->m.misc_bits - s->m.mv_bits;
1866     s->m.current_picture.f.display_picture_number =
1867     s->m.current_picture.f.coded_picture_number   = avctx->frame_number;
1868     s->m.current_picture.f.quality                = pic->quality;
1869     s->m.total_bits += 8*(s->c.bytestream - s->c.bytestream_start);
1870     if(s->pass1_rc)
1871         if (ff_rate_estimate_qscale(&s->m, 0) < 0)
1872             return -1;
1873     if(avctx->flags&CODEC_FLAG_PASS1)
1874         ff_write_pass1_stats(&s->m);
1875     s->m.last_pict_type = s->m.pict_type;
1876     avctx->frame_bits = s->m.frame_bits;
1877     avctx->mv_bits = s->m.mv_bits;
1878     avctx->misc_bits = s->m.misc_bits;
1879     avctx->p_tex_bits = s->m.p_tex_bits;
1880
1881     emms_c();
1882
1883     pkt->size = ff_rac_terminate(c);
1884     if (avctx->coded_frame->key_frame)
1885         pkt->flags |= AV_PKT_FLAG_KEY;
1886     *got_packet = 1;
1887
1888     return 0;
1889 }
1890
1891 static av_cold int encode_end(AVCodecContext *avctx)
1892 {
1893     SnowContext *s = avctx->priv_data;
1894
1895     ff_snow_common_end(s);
1896     if (s->input_picture.data[0])
1897         avctx->release_buffer(avctx, &s->input_picture);
1898     av_free(avctx->stats_out);
1899
1900     return 0;
1901 }
1902
1903 #define OFFSET(x) offsetof(SnowContext, x)
1904 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
1905 static const AVOption options[] = {
1906     { "memc_only",      "Only do ME/MC (I frames -> ref, P frame -> ME+MC).",   OFFSET(memc_only), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
1907     { NULL },
1908 };
1909
1910 static const AVClass snowenc_class = {
1911     .class_name = "snow encoder",
1912     .item_name  = av_default_item_name,
1913     .option     = options,
1914     .version    = LIBAVUTIL_VERSION_INT,
1915 };
1916
1917 AVCodec ff_snow_encoder = {
1918     .name           = "snow",
1919     .type           = AVMEDIA_TYPE_VIDEO,
1920     .id             = CODEC_ID_SNOW,
1921     .priv_data_size = sizeof(SnowContext),
1922     .init           = encode_init,
1923     .encode2        = encode_frame,
1924     .close          = encode_end,
1925     .long_name = NULL_IF_CONFIG_SMALL("Snow"),
1926     .priv_class     = &snowenc_class,
1927 };
1928 #endif