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