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FFmpeg/libavcodec/snowenc.c

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  1. /*

  2.  * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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 "internal.h"

  27. #include "snow_dwt.h"

  28. #include "snow.h"

  29. 

  30. #include "rangecoder.h"

  31. #include "mathops.h"

  32. 

  33. #include "mpegvideo.h"

  34. #include "h263.h"

  35. 

  36. static av_cold int encode_init(AVCodecContext *avctx)

  37. {

  38.     SnowContext *s = avctx->priv_data;

  39.     int plane_index, ret;

  40.     int i;

  41. 

  42.     if(avctx->prediction_method == DWT_97

  43.        && (avctx->flags & CODEC_FLAG_QSCALE)

  44.        && avctx->global_quality == 0){

  45.         av_log(avctx, AV_LOG_ERROR, "The 9/7 wavelet is incompatible with lossless mode.\n");

  46.         return -1;

  47.     }

  48. 

  49.     s->spatial_decomposition_type= avctx->prediction_method; //FIXME add decorrelator type r transform_type

  50. 

  51.     s->mv_scale       = (avctx->flags & CODEC_FLAG_QPEL) ? 2 : 4;

  52.     s->block_max_depth= (avctx->flags & CODEC_FLAG_4MV ) ? 1 : 0;

  53. 

  54.     for(plane_index=0; plane_index<3; plane_index++){

  55.         s->plane[plane_index].diag_mc= 1;

  56.         s->plane[plane_index].htaps= 6;

  57.         s->plane[plane_index].hcoeff[0]=  40;

  58.         s->plane[plane_index].hcoeff[1]= -10;

  59.         s->plane[plane_index].hcoeff[2]=   2;

  60.         s->plane[plane_index].fast_mc= 1;

  61.     }

  62. 

  63.     if ((ret = ff_snow_common_init(avctx)) < 0) {

  64.         ff_snow_common_end(avctx->priv_data);

  65.         return ret;

  66.     }

  67.     ff_snow_alloc_blocks(s);

  68. 

  69.     s->version=0;

  70. 

  71.     s->m.avctx   = avctx;

  72.     s->m.flags   = avctx->flags;

  73.     s->m.bit_rate= avctx->bit_rate;

  74. 

  75.     s->m.me.temp      =

  76.     s->m.me.scratchpad= av_mallocz_array((avctx->width+64), 2*16*2*sizeof(uint8_t));

  77.     s->m.me.map       = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));

  78.     s->m.me.score_map = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));

  79.     s->m.obmc_scratchpad= av_mallocz(MB_SIZE*MB_SIZE*12*sizeof(uint32_t));

  80.     if (!s->m.me.scratchpad || !s->m.me.map || !s->m.me.score_map || !s->m.obmc_scratchpad)

  81.         return AVERROR(ENOMEM);

  82. 

  83.     ff_h263_encode_init(&s->m); //mv_penalty

  84. 

  85.     s->max_ref_frames = FFMAX(FFMIN(avctx->refs, MAX_REF_FRAMES), 1);

  86. 

  87.     if(avctx->flags&CODEC_FLAG_PASS1){

  88.         if(!avctx->stats_out)

  89.             avctx->stats_out = av_mallocz(256);

  90. 

  91.         if (!avctx->stats_out)

  92.             return AVERROR(ENOMEM);

  93.     }

  94.     if((avctx->flags&CODEC_FLAG_PASS2) || !(avctx->flags&CODEC_FLAG_QSCALE)){

  95.         if(ff_rate_control_init(&s->m) < 0)

  96.             return -1;

  97.     }

  98.     s->pass1_rc= !(avctx->flags & (CODEC_FLAG_QSCALE|CODEC_FLAG_PASS2));

  99. 

  100.     switch(avctx->pix_fmt){

  101.     case AV_PIX_FMT_YUV444P:

  102. //    case AV_PIX_FMT_YUV422P:

  103.     case AV_PIX_FMT_YUV420P:

  104. //    case AV_PIX_FMT_YUV411P:

  105.     case AV_PIX_FMT_YUV410P:

  106.         s->nb_planes = 3;

  107.         s->colorspace_type= 0;

  108.         break;

  109.     case AV_PIX_FMT_GRAY8:

  110.         s->nb_planes = 1;

  111.         s->colorspace_type = 1;

  112.         break;

  113. /*    case AV_PIX_FMT_RGB32:

  114.         s->colorspace= 1;

  115.         break;*/

  116.     default:

  117.         av_log(avctx, AV_LOG_ERROR, "pixel format not supported\n");

  118.         return -1;

  119.     }

  120.     avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift, &s->chroma_v_shift);

  121. 

  122.     ff_set_cmp(&s->dsp, s->dsp.me_cmp, s->avctx->me_cmp);

  123.     ff_set_cmp(&s->dsp, s->dsp.me_sub_cmp, s->avctx->me_sub_cmp);

  124. 

  125.     s->input_picture = av_frame_alloc();

  126.     if (!s->input_picture)

  127.         return AVERROR(ENOMEM);

  128. 

  129.     if ((ret = ff_snow_get_buffer(s, s->input_picture)) < 0)

  130.         return ret;

  131. 

  132.     if(s->avctx->me_method == ME_ITER){

  133.         int size= s->b_width * s->b_height << 2*s->block_max_depth;

  134.         for(i=0; i<s->max_ref_frames; i++){

  135.             s->ref_mvs[i]= av_mallocz_array(size, sizeof(int16_t[2]));

  136.             s->ref_scores[i]= av_mallocz_array(size, sizeof(uint32_t));

  137.             if (!s->ref_mvs[i] || !s->ref_scores[i])

  138.                 return AVERROR(ENOMEM);

  139.         }

  140.     }

  141. 

  142.     return 0;

  143. }

  144. 

  145. //near copy & paste from dsputil, FIXME

  146. static int pix_sum(uint8_t * pix, int line_size, int w, int h)

  147. {

  148.     int s, i, j;

  149. 

  150.     s = 0;

  151.     for (i = 0; i < h; i++) {

  152.         for (j = 0; j < w; j++) {

  153.             s += pix[0];

  154.             pix ++;

  155.         }

  156.         pix += line_size - w;

  157.     }

  158.     return s;

  159. }

  160. 

  161. //near copy & paste from dsputil, FIXME

  162. static int pix_norm1(uint8_t * pix, int line_size, int w)

  163. {

  164.     int s, i, j;

  165.     uint32_t *sq = ff_square_tab + 256;

  166. 

  167.     s = 0;

  168.     for (i = 0; i < w; i++) {

  169.         for (j = 0; j < w; j ++) {

  170.             s += sq[pix[0]];

  171.             pix ++;

  172.         }

  173.         pix += line_size - w;

  174.     }

  175.     return s;

  176. }

  177. 

  178. static inline int get_penalty_factor(int lambda, int lambda2, int type){

  179.     switch(type&0xFF){

  180.     default:

  181.     case FF_CMP_SAD:

  182.         return lambda>>FF_LAMBDA_SHIFT;

  183.     case FF_CMP_DCT:

  184.         return (3*lambda)>>(FF_LAMBDA_SHIFT+1);

  185.     case FF_CMP_W53:

  186.         return (4*lambda)>>(FF_LAMBDA_SHIFT);

  187.     case FF_CMP_W97:

  188.         return (2*lambda)>>(FF_LAMBDA_SHIFT);

  189.     case FF_CMP_SATD:

  190.     case FF_CMP_DCT264:

  191.         return (2*lambda)>>FF_LAMBDA_SHIFT;

  192.     case FF_CMP_RD:

  193.     case FF_CMP_PSNR:

  194.     case FF_CMP_SSE:

  195.     case FF_CMP_NSSE:

  196.         return lambda2>>FF_LAMBDA_SHIFT;

  197.     case FF_CMP_BIT:

  198.         return 1;

  199.     }

  200. }

  201. 

  202. //FIXME copy&paste

  203. #define P_LEFT P[1]

  204. #define P_TOP P[2]

  205. #define P_TOPRIGHT P[3]

  206. #define P_MEDIAN P[4]

  207. #define P_MV1 P[9]

  208. #define FLAG_QPEL   1 //must be 1

  209. 

  210. static int encode_q_branch(SnowContext *s, int level, int x, int y){

  211.     uint8_t p_buffer[1024];

  212.     uint8_t i_buffer[1024];

  213.     uint8_t p_state[sizeof(s->block_state)];

  214.     uint8_t i_state[sizeof(s->block_state)];

  215.     RangeCoder pc, ic;

  216.     uint8_t *pbbak= s->c.bytestream;

  217.     uint8_t *pbbak_start= s->c.bytestream_start;

  218.     int score, score2, iscore, i_len, p_len, block_s, sum, base_bits;

  219.     const int w= s->b_width  << s->block_max_depth;

  220.     const int h= s->b_height << s->block_max_depth;

  221.     const int rem_depth= s->block_max_depth - level;

  222.     const int index= (x + y*w) << rem_depth;

  223.     const int block_w= 1<<(LOG2_MB_SIZE - level);

  224.     int trx= (x+1)<<rem_depth;

  225.     int try= (y+1)<<rem_depth;

  226.     const BlockNode *left  = x ? &s->block[index-1] : &null_block;

  227.     const BlockNode *top   = y ? &s->block[index-w] : &null_block;

  228.     const BlockNode *right = trx<w ? &s->block[index+1] : &null_block;

  229.     const BlockNode *bottom= try<h ? &s->block[index+w] : &null_block;

  230.     const BlockNode *tl    = y && x ? &s->block[index-w-1] : left;

  231.     const BlockNode *tr    = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt

  232.     int pl = left->color[0];

  233.     int pcb= left->color[1];

  234.     int pcr= left->color[2];

  235.     int pmx, pmy;

  236.     int mx=0, my=0;

  237.     int l,cr,cb;

  238.     const int stride= s->current_picture->linesize[0];

  239.     const int uvstride= s->current_picture->linesize[1];

  240.     uint8_t *current_data[3]= { s->input_picture->data[0] + (x + y*  stride)*block_w,

  241.                                 s->input_picture->data[1] + ((x*block_w)>>s->chroma_h_shift) + ((y*uvstride*block_w)>>s->chroma_v_shift),

  242.                                 s->input_picture->data[2] + ((x*block_w)>>s->chroma_h_shift) + ((y*uvstride*block_w)>>s->chroma_v_shift)};

  243.     int P[10][2];

  244.     int16_t last_mv[3][2];

  245.     int qpel= !!(s->avctx->flags & CODEC_FLAG_QPEL); //unused

  246.     const int shift= 1+qpel;

  247.     MotionEstContext *c= &s->m.me;

  248.     int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);

  249.     int mx_context= av_log2(2*FFABS(left->mx - top->mx));

  250.     int my_context= av_log2(2*FFABS(left->my - top->my));

  251.     int s_context= 2*left->level + 2*top->level + tl->level + tr->level;

  252.     int ref, best_ref, ref_score, ref_mx, ref_my;

  253. 

  254.     av_assert0(sizeof(s->block_state) >= 256);

  255.     if(s->keyframe){

  256.         set_blocks(s, level, x, y, pl, pcb, pcr, 0, 0, 0, BLOCK_INTRA);

  257.         return 0;

  258.     }

  259. 

  260. //    clip predictors / edge ?

  261. 

  262.     P_LEFT[0]= left->mx;

  263.     P_LEFT[1]= left->my;

  264.     P_TOP [0]= top->mx;

  265.     P_TOP [1]= top->my;

  266.     P_TOPRIGHT[0]= tr->mx;

  267.     P_TOPRIGHT[1]= tr->my;

  268. 

  269.     last_mv[0][0]= s->block[index].mx;

  270.     last_mv[0][1]= s->block[index].my;

  271.     last_mv[1][0]= right->mx;

  272.     last_mv[1][1]= right->my;

  273.     last_mv[2][0]= bottom->mx;

  274.     last_mv[2][1]= bottom->my;

  275. 

  276.     s->m.mb_stride=2;

  277.     s->m.mb_x=

  278.     s->m.mb_y= 0;

  279.     c->skip= 0;

  280. 

  281.     av_assert1(c->  stride ==   stride);

  282.     av_assert1(c->uvstride == uvstride);

  283. 

  284.     c->penalty_factor    = get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_cmp);

  285.     c->sub_penalty_factor= get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_sub_cmp);

  286.     c->mb_penalty_factor = get_penalty_factor(s->lambda, s->lambda2, c->avctx->mb_cmp);

  287.     c->current_mv_penalty= c->mv_penalty[s->m.f_code=1] + MAX_MV;

  288. 

  289.     c->xmin = - x*block_w - 16+3;

  290.     c->ymin = - y*block_w - 16+3;

  291.     c->xmax = - (x+1)*block_w + (w<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3;

  292.     c->ymax = - (y+1)*block_w + (h<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3;

  293. 

  294.     if(P_LEFT[0]     > (c->xmax<<shift)) P_LEFT[0]    = (c->xmax<<shift);

  295.     if(P_LEFT[1]     > (c->ymax<<shift)) P_LEFT[1]    = (c->ymax<<shift);

  296.     if(P_TOP[0]      > (c->xmax<<shift)) P_TOP[0]     = (c->xmax<<shift);

  297.     if(P_TOP[1]      > (c->ymax<<shift)) P_TOP[1]     = (c->ymax<<shift);

  298.     if(P_TOPRIGHT[0] < (c->xmin<<shift)) P_TOPRIGHT[0]= (c->xmin<<shift);

  299.     if(P_TOPRIGHT[0] > (c->xmax<<shift)) P_TOPRIGHT[0]= (c->xmax<<shift); //due to pmx no clip

  300.     if(P_TOPRIGHT[1] > (c->ymax<<shift)) P_TOPRIGHT[1]= (c->ymax<<shift);

  301. 

  302.     P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);

  303.     P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);

  304. 

  305.     if (!y) {

  306.         c->pred_x= P_LEFT[0];

  307.         c->pred_y= P_LEFT[1];

  308.     } else {

  309.         c->pred_x = P_MEDIAN[0];

  310.         c->pred_y = P_MEDIAN[1];

  311.     }

  312. 

  313.     score= INT_MAX;

  314.     best_ref= 0;

  315.     for(ref=0; ref<s->ref_frames; ref++){

  316.         init_ref(c, current_data, s->last_picture[ref]->data, NULL, block_w*x, block_w*y, 0);

  317. 

  318.         ref_score= ff_epzs_motion_search(&s->m, &ref_mx, &ref_my, P, 0, /*ref_index*/ 0, last_mv,

  319.                                          (1<<16)>>shift, level-LOG2_MB_SIZE+4, block_w);

  320. 

  321.         av_assert2(ref_mx >= c->xmin);

  322.         av_assert2(ref_mx <= c->xmax);

  323.         av_assert2(ref_my >= c->ymin);

  324.         av_assert2(ref_my <= c->ymax);

  325. 

  326.         ref_score= c->sub_motion_search(&s->m, &ref_mx, &ref_my, ref_score, 0, 0, level-LOG2_MB_SIZE+4, block_w);

  327.         ref_score= ff_get_mb_score(&s->m, ref_mx, ref_my, 0, 0, level-LOG2_MB_SIZE+4, block_w, 0);

  328.         ref_score+= 2*av_log2(2*ref)*c->penalty_factor;

  329.         if(s->ref_mvs[ref]){

  330.             s->ref_mvs[ref][index][0]= ref_mx;

  331.             s->ref_mvs[ref][index][1]= ref_my;

  332.             s->ref_scores[ref][index]= ref_score;

  333.         }

  334.         if(score > ref_score){

  335.             score= ref_score;

  336.             best_ref= ref;

  337.             mx= ref_mx;

  338.             my= ref_my;

  339.         }

  340.     }

  341.     //FIXME if mb_cmp != SSE then intra cannot be compared currently and mb_penalty vs. lambda2

  342. 

  343.   //  subpel search

  344.     base_bits= get_rac_count(&s->c) - 8*(s->c.bytestream - s->c.bytestream_start);

  345.     pc= s->c;

  346.     pc.bytestream_start=

  347.     pc.bytestream= p_buffer; //FIXME end/start? and at the other stoo

  348.     memcpy(p_state, s->block_state, sizeof(s->block_state));

  349. 

  350.     if(level!=s->block_max_depth)

  351.         put_rac(&pc, &p_state[4 + s_context], 1);

  352.     put_rac(&pc, &p_state[1 + left->type + top->type], 0);

  353.     if(s->ref_frames > 1)

  354.         put_symbol(&pc, &p_state[128 + 1024 + 32*ref_context], best_ref, 0);

  355.     pred_mv(s, &pmx, &pmy, best_ref, left, top, tr);

  356.     put_symbol(&pc, &p_state[128 + 32*(mx_context + 16*!!best_ref)], mx - pmx, 1);

  357.     put_symbol(&pc, &p_state[128 + 32*(my_context + 16*!!best_ref)], my - pmy, 1);

  358.     p_len= pc.bytestream - pc.bytestream_start;

  359.     score += (s->lambda2*(get_rac_count(&pc)-base_bits))>>FF_LAMBDA_SHIFT;

  360. 

  361.     block_s= block_w*block_w;

  362.     sum = pix_sum(current_data[0], stride, block_w, block_w);

  363.     l= (sum + block_s/2)/block_s;

  364.     iscore = pix_norm1(current_data[0], stride, block_w) - 2*l*sum + l*l*block_s;

  365. 

  366.     if (s->nb_planes > 2) {

  367.         block_s= block_w*block_w>>(s->chroma_h_shift + s->chroma_v_shift);

  368.         sum = pix_sum(current_data[1], uvstride, block_w>>s->chroma_h_shift, block_w>>s->chroma_v_shift);

  369.         cb= (sum + block_s/2)/block_s;

  370.     //    iscore += pix_norm1(&current_mb[1][0], uvstride, block_w>>1) - 2*cb*sum + cb*cb*block_s;

  371.         sum = pix_sum(current_data[2], uvstride, block_w>>s->chroma_h_shift, block_w>>s->chroma_v_shift);

  372.         cr= (sum + block_s/2)/block_s;

  373.     //    iscore += pix_norm1(&current_mb[2][0], uvstride, block_w>>1) - 2*cr*sum + cr*cr*block_s;

  374.     }else

  375.         cb = cr = 0;

  376. 

  377.     ic= s->c;

  378.     ic.bytestream_start=

  379.     ic.bytestream= i_buffer; //FIXME end/start? and at the other stoo

  380.     memcpy(i_state, s->block_state, sizeof(s->block_state));

  381.     if(level!=s->block_max_depth)

  382.         put_rac(&ic, &i_state[4 + s_context], 1);

  383.     put_rac(&ic, &i_state[1 + left->type + top->type], 1);

  384.     put_symbol(&ic, &i_state[32],  l-pl , 1);

  385.     if (s->nb_planes > 2) {

  386.         put_symbol(&ic, &i_state[64], cb-pcb, 1);

  387.         put_symbol(&ic, &i_state[96], cr-pcr, 1);

  388.     }

  389.     i_len= ic.bytestream - ic.bytestream_start;

  390.     iscore += (s->lambda2*(get_rac_count(&ic)-base_bits))>>FF_LAMBDA_SHIFT;

  391. 

  392. //    assert(score==256*256*256*64-1);

  393.     av_assert1(iscore < 255*255*256 + s->lambda2*10);

  394.     av_assert1(iscore >= 0);

  395.     av_assert1(l>=0 && l<=255);

  396.     av_assert1(pl>=0 && pl<=255);

  397. 

  398.     if(level==0){

  399.         int varc= iscore >> 8;

  400.         int vard= score >> 8;

  401.         if (vard <= 64 || vard < varc)

  402.             c->scene_change_score+= ff_sqrt(vard) - ff_sqrt(varc);

  403.         else

  404.             c->scene_change_score+= s->m.qscale;

  405.     }

  406. 

  407.     if(level!=s->block_max_depth){

  408.         put_rac(&s->c, &s->block_state[4 + s_context], 0);

  409.         score2 = encode_q_branch(s, level+1, 2*x+0, 2*y+0);

  410.         score2+= encode_q_branch(s, level+1, 2*x+1, 2*y+0);

  411.         score2+= encode_q_branch(s, level+1, 2*x+0, 2*y+1);

  412.         score2+= encode_q_branch(s, level+1, 2*x+1, 2*y+1);

  413.         score2+= s->lambda2>>FF_LAMBDA_SHIFT; //FIXME exact split overhead

  414. 

  415.         if(score2 < score && score2 < iscore)

  416.             return score2;

  417.     }

  418. 

  419.     if(iscore < score){

  420.         pred_mv(s, &pmx, &pmy, 0, left, top, tr);

  421.         memcpy(pbbak, i_buffer, i_len);

  422.         s->c= ic;

  423.         s->c.bytestream_start= pbbak_start;

  424.         s->c.bytestream= pbbak + i_len;

  425.         set_blocks(s, level, x, y, l, cb, cr, pmx, pmy, 0, BLOCK_INTRA);

  426.         memcpy(s->block_state, i_state, sizeof(s->block_state));

  427.         return iscore;

  428.     }else{

  429.         memcpy(pbbak, p_buffer, p_len);

  430.         s->c= pc;

  431.         s->c.bytestream_start= pbbak_start;

  432.         s->c.bytestream= pbbak + p_len;

  433.         set_blocks(s, level, x, y, pl, pcb, pcr, mx, my, best_ref, 0);

  434.         memcpy(s->block_state, p_state, sizeof(s->block_state));

  435.         return score;

  436.     }

  437. }

  438. 

  439. static void encode_q_branch2(SnowContext *s, int level, int x, int y){

  440.     const int w= s->b_width  << s->block_max_depth;

  441.     const int rem_depth= s->block_max_depth - level;

  442.     const int index= (x + y*w) << rem_depth;

  443.     int trx= (x+1)<<rem_depth;

  444.     BlockNode *b= &s->block[index];

  445.     const BlockNode *left  = x ? &s->block[index-1] : &null_block;

  446.     const BlockNode *top   = y ? &s->block[index-w] : &null_block;

  447.     const BlockNode *tl    = y && x ? &s->block[index-w-1] : left;

  448.     const BlockNode *tr    = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt

  449.     int pl = left->color[0];

  450.     int pcb= left->color[1];

  451.     int pcr= left->color[2];

  452.     int pmx, pmy;

  453.     int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);

  454.     int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 16*!!b->ref;

  455.     int my_context= av_log2(2*FFABS(left->my - top->my)) + 16*!!b->ref;

  456.     int s_context= 2*left->level + 2*top->level + tl->level + tr->level;

  457. 

  458.     if(s->keyframe){

  459.         set_blocks(s, level, x, y, pl, pcb, pcr, 0, 0, 0, BLOCK_INTRA);

  460.         return;

  461.     }

  462. 

  463.     if(level!=s->block_max_depth){

  464.         if(same_block(b,b+1) && same_block(b,b+w) && same_block(b,b+w+1)){

  465.             put_rac(&s->c, &s->block_state[4 + s_context], 1);

  466.         }else{

  467.             put_rac(&s->c, &s->block_state[4 + s_context], 0);

  468.             encode_q_branch2(s, level+1, 2*x+0, 2*y+0);

  469.             encode_q_branch2(s, level+1, 2*x+1, 2*y+0);

  470.             encode_q_branch2(s, level+1, 2*x+0, 2*y+1);

  471.             encode_q_branch2(s, level+1, 2*x+1, 2*y+1);

  472.             return;

  473.         }

  474.     }

  475.     if(b->type & BLOCK_INTRA){

  476.         pred_mv(s, &pmx, &pmy, 0, left, top, tr);

  477.         put_rac(&s->c, &s->block_state[1 + (left->type&1) + (top->type&1)], 1);

  478.         put_symbol(&s->c, &s->block_state[32], b->color[0]-pl , 1);

  479.         if (s->nb_planes > 2) {

  480.             put_symbol(&s->c, &s->block_state[64], b->color[1]-pcb, 1);

  481.             put_symbol(&s->c, &s->block_state[96], b->color[2]-pcr, 1);

  482.         }

  483.         set_blocks(s, level, x, y, b->color[0], b->color[1], b->color[2], pmx, pmy, 0, BLOCK_INTRA);

  484.     }else{

  485.         pred_mv(s, &pmx, &pmy, b->ref, left, top, tr);

  486.         put_rac(&s->c, &s->block_state[1 + (left->type&1) + (top->type&1)], 0);

  487.         if(s->ref_frames > 1)

  488.             put_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], b->ref, 0);

  489.         put_symbol(&s->c, &s->block_state[128 + 32*mx_context], b->mx - pmx, 1);

  490.         put_symbol(&s->c, &s->block_state[128 + 32*my_context], b->my - pmy, 1);

  491.         set_blocks(s, level, x, y, pl, pcb, pcr, b->mx, b->my, b->ref, 0);

  492.     }

  493. }

  494. 

  495. static int get_dc(SnowContext *s, int mb_x, int mb_y, int plane_index){

  496.     int i, x2, y2;

  497.     Plane *p= &s->plane[plane_index];

  498.     const int block_size = MB_SIZE >> s->block_max_depth;

  499.     const int block_w    = plane_index ? block_size>>s->chroma_h_shift : block_size;

  500.     const int block_h    = plane_index ? block_size>>s->chroma_v_shift : block_size;

  501.     const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];

  502.     const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;

  503.     const int ref_stride= s->current_picture->linesize[plane_index];

  504.     uint8_t *src= s-> input_picture->data[plane_index];

  505.     IDWTELEM *dst= (IDWTELEM*)s->m.obmc_scratchpad + plane_index*block_size*block_size*4; //FIXME change to unsigned

  506.     const int b_stride = s->b_width << s->block_max_depth;

  507.     const int w= p->width;

  508.     const int h= p->height;

  509.     int index= mb_x + mb_y*b_stride;

  510.     BlockNode *b= &s->block[index];

  511.     BlockNode backup= *b;

  512.     int ab=0;

  513.     int aa=0;

  514. 

  515.     av_assert2(s->chroma_h_shift == s->chroma_v_shift); //obmc stuff above

  516. 

  517.     b->type|= BLOCK_INTRA;

  518.     b->color[plane_index]= 0;

  519.     memset(dst, 0, obmc_stride*obmc_stride*sizeof(IDWTELEM));

  520. 

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

  522.         int mb_x2= mb_x + (i &1) - 1;

  523.         int mb_y2= mb_y + (i>>1) - 1;

  524.         int x= block_w*mb_x2 + block_w/2;

  525.         int y= block_h*mb_y2 + block_h/2;

  526. 

  527.         add_yblock(s, 0, NULL, dst + (i&1)*block_w + (i>>1)*obmc_stride*block_h, NULL, obmc,

  528.                     x, y, block_w, block_h, w, h, obmc_stride, ref_stride, obmc_stride, mb_x2, mb_y2, 0, 0, plane_index);

  529. 

  530.         for(y2= FFMAX(y, 0); y2<FFMIN(h, y+block_h); y2++){

  531.             for(x2= FFMAX(x, 0); x2<FFMIN(w, x+block_w); x2++){

  532.                 int index= x2-(block_w*mb_x - block_w/2) + (y2-(block_h*mb_y - block_h/2))*obmc_stride;

  533.                 int obmc_v= obmc[index];

  534.                 int d;

  535.                 if(y<0) obmc_v += obmc[index + block_h*obmc_stride];

  536.                 if(x<0) obmc_v += obmc[index + block_w];

  537.                 if(y+block_h>h) obmc_v += obmc[index - block_h*obmc_stride];

  538.                 if(x+block_w>w) obmc_v += obmc[index - block_w];

  539.                 //FIXME precalculate this or simplify it somehow else

  540. 

  541.                 d = -dst[index] + (1<<(FRAC_BITS-1));

  542.                 dst[index] = d;

  543.                 ab += (src[x2 + y2*ref_stride] - (d>>FRAC_BITS)) * obmc_v;

  544.                 aa += obmc_v * obmc_v; //FIXME precalculate this

  545.             }

  546.         }

  547.     }

  548.     *b= backup;

  549. 

  550.     return av_clip( ROUNDED_DIV(ab<<LOG2_OBMC_MAX, aa), 0, 255); //FIXME we should not need clipping

  551. }

  552. 

  553. static inline int get_block_bits(SnowContext *s, int x, int y, int w){

  554.     const int b_stride = s->b_width << s->block_max_depth;

  555.     const int b_height = s->b_height<< s->block_max_depth;

  556.     int index= x + y*b_stride;

  557.     const BlockNode *b     = &s->block[index];

  558.     const BlockNode *left  = x ? &s->block[index-1] : &null_block;

  559.     const BlockNode *top   = y ? &s->block[index-b_stride] : &null_block;

  560.     const BlockNode *tl    = y && x ? &s->block[index-b_stride-1] : left;

  561.     const BlockNode *tr    = y && x+w<b_stride ? &s->block[index-b_stride+w] : tl;

  562.     int dmx, dmy;

  563. //  int mx_context= av_log2(2*FFABS(left->mx - top->mx));

  564. //  int my_context= av_log2(2*FFABS(left->my - top->my));

  565. 

  566.     if(x<0 || x>=b_stride || y>=b_height)

  567.         return 0;

  568. /*

  569. 1            0      0

  570. 01X          1-2    1

  571. 001XX        3-6    2-3

  572. 0001XXX      7-14   4-7

  573. 00001XXXX   15-30   8-15

  574. */

  575. //FIXME try accurate rate

  576. //FIXME intra and inter predictors if surrounding blocks are not the same type

  577.     if(b->type & BLOCK_INTRA){

  578.         return 3+2*( av_log2(2*FFABS(left->color[0] - b->color[0]))

  579.                    + av_log2(2*FFABS(left->color[1] - b->color[1]))

  580.                    + av_log2(2*FFABS(left->color[2] - b->color[2])));

  581.     }else{

  582.         pred_mv(s, &dmx, &dmy, b->ref, left, top, tr);

  583.         dmx-= b->mx;

  584.         dmy-= b->my;

  585.         return 2*(1 + av_log2(2*FFABS(dmx)) //FIXME kill the 2* can be merged in lambda

  586.                     + av_log2(2*FFABS(dmy))

  587.                     + av_log2(2*b->ref));

  588.     }

  589. }

  590. 

  591. static int get_block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index, uint8_t (*obmc_edged)[MB_SIZE * 2]){

  592.     Plane *p= &s->plane[plane_index];

  593.     const int block_size = MB_SIZE >> s->block_max_depth;

  594.     const int block_w    = plane_index ? block_size>>s->chroma_h_shift : block_size;

  595.     const int block_h    = plane_index ? block_size>>s->chroma_v_shift : block_size;

  596.     const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;

  597.     const int ref_stride= s->current_picture->linesize[plane_index];

  598.     uint8_t *dst= s->current_picture->data[plane_index];

  599.     uint8_t *src= s->  input_picture->data[plane_index];

  600.     IDWTELEM *pred= (IDWTELEM*)s->m.obmc_scratchpad + plane_index*block_size*block_size*4;

  601.     uint8_t *cur = s->scratchbuf;

  602.     uint8_t *tmp = s->emu_edge_buffer;

  603.     const int b_stride = s->b_width << s->block_max_depth;

  604.     const int b_height = s->b_height<< s->block_max_depth;

  605.     const int w= p->width;

  606.     const int h= p->height;

  607.     int distortion;

  608.     int rate= 0;

  609.     const int penalty_factor= get_penalty_factor(s->lambda, s->lambda2, s->avctx->me_cmp);

  610.     int sx= block_w*mb_x - block_w/2;

  611.     int sy= block_h*mb_y - block_h/2;

  612.     int x0= FFMAX(0,-sx);

  613.     int y0= FFMAX(0,-sy);

  614.     int x1= FFMIN(block_w*2, w-sx);

  615.     int y1= FFMIN(block_h*2, h-sy);

  616.     int i,x,y;

  617. 

  618.     av_assert2(s->chroma_h_shift == s->chroma_v_shift); //obmc and square assumtions below chckinhg only block_w

  619. 

  620.     ff_snow_pred_block(s, cur, tmp, ref_stride, sx, sy, block_w*2, block_h*2, &s->block[mb_x + mb_y*b_stride], plane_index, w, h);

  621. 

  622.     for(y=y0; y<y1; y++){

  623.         const uint8_t *obmc1= obmc_edged[y];

  624.         const IDWTELEM *pred1 = pred + y*obmc_stride;

  625.         uint8_t *cur1 = cur + y*ref_stride;

  626.         uint8_t *dst1 = dst + sx + (sy+y)*ref_stride;

  627.         for(x=x0; x<x1; x++){

  628. #if FRAC_BITS >= LOG2_OBMC_MAX

  629.             int v = (cur1[x] * obmc1[x]) << (FRAC_BITS - LOG2_OBMC_MAX);

  630. #else

  631.             int v = (cur1[x] * obmc1[x] + (1<<(LOG2_OBMC_MAX - FRAC_BITS-1))) >> (LOG2_OBMC_MAX - FRAC_BITS);

  632. #endif

  633.             v = (v + pred1[x]) >> FRAC_BITS;

  634.             if(v&(~255)) v= ~(v>>31);

  635.             dst1[x] = v;

  636.         }

  637.     }

  638. 

  639.     /* copy the regions where obmc[] = (uint8_t)256 */

  640.     if(LOG2_OBMC_MAX == 8

  641.         && (mb_x == 0 || mb_x == b_stride-1)

  642.         && (mb_y == 0 || mb_y == b_height-1)){

  643.         if(mb_x == 0)

  644.             x1 = block_w;

  645.         else

  646.             x0 = block_w;

  647.         if(mb_y == 0)

  648.             y1 = block_h;

  649.         else

  650.             y0 = block_h;

  651.         for(y=y0; y<y1; y++)

  652.             memcpy(dst + sx+x0 + (sy+y)*ref_stride, cur + x0 + y*ref_stride, x1-x0);

  653.     }

  654. 

  655.     if(block_w==16){

  656.         /* FIXME rearrange dsputil to fit 32x32 cmp functions */

  657.         /* FIXME check alignment of the cmp wavelet vs the encoding wavelet */

  658.         /* FIXME cmps overlap but do not cover the wavelet's whole support.

  659.          * So improving the score of one block is not strictly guaranteed

  660.          * to improve the score of the whole frame, thus iterative motion

  661.          * estimation does not always converge. */

  662.         if(s->avctx->me_cmp == FF_CMP_W97)

  663.             distortion = ff_w97_32_c(&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, 32);

  664.         else if(s->avctx->me_cmp == FF_CMP_W53)

  665.             distortion = ff_w53_32_c(&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, 32);

  666.         else{

  667.             distortion = 0;

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

  669.                 int off = sx+16*(i&1) + (sy+16*(i>>1))*ref_stride;

  670.                 distortion += s->dsp.me_cmp[0](&s->m, src + off, dst + off, ref_stride, 16);

  671.             }

  672.         }

  673.     }else{

  674.         av_assert2(block_w==8);

  675.         distortion = s->dsp.me_cmp[0](&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, block_w*2);

  676.     }

  677. 

  678.     if(plane_index==0){

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

  680. /* ..RRr

  681.  * .RXx.

  682.  * rxx..

  683.  */

  684.             rate += get_block_bits(s, mb_x + (i&1) - (i>>1), mb_y + (i>>1), 1);

  685.         }

  686.         if(mb_x == b_stride-2)

  687.             rate += get_block_bits(s, mb_x + 1, mb_y + 1, 1);

  688.     }

  689.     return distortion + rate*penalty_factor;

  690. }

  691. 

  692. static int get_4block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index){

  693.     int i, y2;

  694.     Plane *p= &s->plane[plane_index];

  695.     const int block_size = MB_SIZE >> s->block_max_depth;

  696.     const int block_w    = plane_index ? block_size>>s->chroma_h_shift : block_size;

  697.     const int block_h    = plane_index ? block_size>>s->chroma_v_shift : block_size;

  698.     const uint8_t *obmc  = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];

  699.     const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;

  700.     const int ref_stride= s->current_picture->linesize[plane_index];

  701.     uint8_t *dst= s->current_picture->data[plane_index];

  702.     uint8_t *src= s-> input_picture->data[plane_index];

  703.     //FIXME zero_dst is const but add_yblock changes dst if add is 0 (this is never the case for dst=zero_dst

  704.     // const has only been removed from zero_dst to suppress a warning

  705.     static IDWTELEM zero_dst[4096]; //FIXME

  706.     const int b_stride = s->b_width << s->block_max_depth;

  707.     const int w= p->width;

  708.     const int h= p->height;

  709.     int distortion= 0;

  710.     int rate= 0;

  711.     const int penalty_factor= get_penalty_factor(s->lambda, s->lambda2, s->avctx->me_cmp);

  712. 

  713.     av_assert2(s->chroma_h_shift == s->chroma_v_shift); //obmc and square assumtions below

  714. 

  715.     for(i=0; i<9; i++){

  716.         int mb_x2= mb_x + (i%3) - 1;

  717.         int mb_y2= mb_y + (i/3) - 1;

  718.         int x= block_w*mb_x2 + block_w/2;

  719.         int y= block_h*mb_y2 + block_h/2;

  720. 

  721.         add_yblock(s, 0, NULL, zero_dst, dst, obmc,

  722.                    x, y, block_w, block_h, w, h, /*dst_stride*/0, ref_stride, obmc_stride, mb_x2, mb_y2, 1, 1, plane_index);

  723. 

  724.         //FIXME find a cleaner/simpler way to skip the outside stuff

  725.         for(y2= y; y2<0; y2++)

  726.             memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, block_w);

  727.         for(y2= h; y2<y+block_h; y2++)

  728.             memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, block_w);

  729.         if(x<0){

  730.             for(y2= y; y2<y+block_h; y2++)

  731.                 memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, -x);

  732.         }

  733.         if(x+block_w > w){

  734.             for(y2= y; y2<y+block_h; y2++)

  735.                 memcpy(dst + w + y2*ref_stride, src + w + y2*ref_stride, x+block_w - w);

  736.         }

  737. 

  738.         av_assert1(block_w== 8 || block_w==16);

  739.         distortion += s->dsp.me_cmp[block_w==8](&s->m, src + x + y*ref_stride, dst + x + y*ref_stride, ref_stride, block_h);

  740.     }

  741. 

  742.     if(plane_index==0){

  743.         BlockNode *b= &s->block[mb_x+mb_y*b_stride];

  744.         int merged= same_block(b,b+1) && same_block(b,b+b_stride) && same_block(b,b+b_stride+1);

  745. 

  746. /* ..RRRr

  747.  * .RXXx.

  748.  * .RXXx.

  749.  * rxxx.

  750.  */

  751.         if(merged)

  752.             rate = get_block_bits(s, mb_x, mb_y, 2);

  753.         for(i=merged?4:0; i<9; i++){

  754.             static const int dxy[9][2] = {{0,0},{1,0},{0,1},{1,1},{2,0},{2,1},{-1,2},{0,2},{1,2}};

  755.             rate += get_block_bits(s, mb_x + dxy[i][0], mb_y + dxy[i][1], 1);

  756.         }

  757.     }

  758.     return distortion + rate*penalty_factor;

  759. }

  760. 

  761. static int encode_subband_c0run(SnowContext *s, SubBand *b, const IDWTELEM *src, const IDWTELEM *parent, int stride, int orientation){

  762.     const int w= b->width;

  763.     const int h= b->height;

  764.     int x, y;

  765. 

  766.     if(1){

  767.         int run=0;

  768.         int *runs = s->run_buffer;

  769.         int run_index=0;

  770.         int max_index;

  771. 

  772.         for(y=0; y<h; y++){

  773.             for(x=0; x<w; x++){

  774.                 int v, p=0;

  775.                 int /*ll=0, */l=0, lt=0, t=0, rt=0;

  776.                 v= src[x + y*stride];

  777. 

  778.                 if(y){

  779.                     t= src[x + (y-1)*stride];

  780.                     if(x){

  781.                         lt= src[x - 1 + (y-1)*stride];

  782.                     }

  783.                     if(x + 1 < w){

  784.                         rt= src[x + 1 + (y-1)*stride];

  785.                     }

  786.                 }

  787.                 if(x){

  788.                     l= src[x - 1 + y*stride];

  789.                     /*if(x > 1){

  790.                         if(orientation==1) ll= src[y + (x-2)*stride];

  791.                         else               ll= src[x - 2 + y*stride];

  792.                     }*/

  793.                 }

  794.                 if(parent){

  795.                     int px= x>>1;

  796.                     int py= y>>1;

  797.                     if(px<b->parent->width && py<b->parent->height)

  798.                         p= parent[px + py*2*stride];

  799.                 }

  800.                 if(!(/*ll|*/l|lt|t|rt|p)){

  801.                     if(v){

  802.                         runs[run_index++]= run;

  803.                         run=0;

  804.                     }else{

  805.                         run++;

  806.                     }

  807.                 }

  808.             }

  809.         }

  810.         max_index= run_index;

  811.         runs[run_index++]= run;

  812.         run_index=0;

  813.         run= runs[run_index++];

  814. 

  815.         put_symbol2(&s->c, b->state[30], max_index, 0);

  816.         if(run_index <= max_index)

  817.             put_symbol2(&s->c, b->state[1], run, 3);

  818. 

  819.         for(y=0; y<h; y++){

  820.             if(s->c.bytestream_end - s->c.bytestream < w*40){

  821.                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");

  822.                 return -1;

  823.             }

  824.             for(x=0; x<w; x++){

  825.                 int v, p=0;

  826.                 int /*ll=0, */l=0, lt=0, t=0, rt=0;

  827.                 v= src[x + y*stride];

  828. 

  829.                 if(y){

  830.                     t= src[x + (y-1)*stride];

  831.                     if(x){

  832.                         lt= src[x - 1 + (y-1)*stride];

  833.                     }

  834.                     if(x + 1 < w){

  835.                         rt= src[x + 1 + (y-1)*stride];

  836.                     }

  837.                 }

  838.                 if(x){

  839.                     l= src[x - 1 + y*stride];

  840.                     /*if(x > 1){

  841.                         if(orientation==1) ll= src[y + (x-2)*stride];

  842.                         else               ll= src[x - 2 + y*stride];

  843.                     }*/

  844.                 }

  845.                 if(parent){

  846.                     int px= x>>1;

  847.                     int py= y>>1;

  848.                     if(px<b->parent->width && py<b->parent->height)

  849.                         p= parent[px + py*2*stride];

  850.                 }

  851.                 if(/*ll|*/l|lt|t|rt|p){

  852.                     int context= av_log2(/*FFABS(ll) + */3*FFABS(l) + FFABS(lt) + 2*FFABS(t) + FFABS(rt) + FFABS(p));

  853. 

  854.                     put_rac(&s->c, &b->state[0][context], !!v);

  855.                 }else{

  856.                     if(!run){

  857.                         run= runs[run_index++];

  858. 

  859.                         if(run_index <= max_index)

  860.                             put_symbol2(&s->c, b->state[1], run, 3);

  861.                         av_assert2(v);

  862.                     }else{

  863.                         run--;

  864.                         av_assert2(!v);

  865.                     }

  866.                 }

  867.                 if(v){

  868.                     int context= av_log2(/*FFABS(ll) + */3*FFABS(l) + FFABS(lt) + 2*FFABS(t) + FFABS(rt) + FFABS(p));

  869.                     int l2= 2*FFABS(l) + (l<0);

  870.                     int t2= 2*FFABS(t) + (t<0);

  871. 

  872.                     put_symbol2(&s->c, b->state[context + 2], FFABS(v)-1, context-4);

  873.                     put_rac(&s->c, &b->state[0][16 + 1 + 3 + ff_quant3bA[l2&0xFF] + 3*ff_quant3bA[t2&0xFF]], v<0);

  874.                 }

  875.             }

  876.         }

  877.     }

  878.     return 0;

  879. }

  880. 

  881. static int encode_subband(SnowContext *s, SubBand *b, const IDWTELEM *src, const IDWTELEM *parent, int stride, int orientation){

  882. //    encode_subband_qtree(s, b, src, parent, stride, orientation);

  883. //    encode_subband_z0run(s, b, src, parent, stride, orientation);

  884.     return encode_subband_c0run(s, b, src, parent, stride, orientation);

  885. //    encode_subband_dzr(s, b, src, parent, stride, orientation);

  886. }

  887. 

  888. static av_always_inline int check_block(SnowContext *s, int mb_x, int mb_y, int p[3], int intra, uint8_t (*obmc_edged)[MB_SIZE * 2], int *best_rd){

  889.     const int b_stride= s->b_width << s->block_max_depth;

  890.     BlockNode *block= &s->block[mb_x + mb_y * b_stride];

  891.     BlockNode backup= *block;

  892.     unsigned value;

  893.     int rd, index;

  894. 

  895.     av_assert2(mb_x>=0 && mb_y>=0);

  896.     av_assert2(mb_x<b_stride);

  897. 

  898.     if(intra){

  899.         block->color[0] = p[0];

  900.         block->color[1] = p[1];

  901.         block->color[2] = p[2];

  902.         block->type |= BLOCK_INTRA;

  903.     }else{

  904.         index= (p[0] + 31*p[1]) & (ME_CACHE_SIZE-1);

  905.         value= s->me_cache_generation + (p[0]>>10) + (p[1]<<6) + (block->ref<<12);

  906.         if(s->me_cache[index] == value)

  907.             return 0;

  908.         s->me_cache[index]= value;

  909. 

  910.         block->mx= p[0];

  911.         block->my= p[1];

  912.         block->type &= ~BLOCK_INTRA;

  913.     }

  914. 

  915.     rd= get_block_rd(s, mb_x, mb_y, 0, obmc_edged);

  916. 

  917. //FIXME chroma

  918.     if(rd < *best_rd){

  919.         *best_rd= rd;

  920.         return 1;

  921.     }else{

  922.         *block= backup;

  923.         return 0;

  924.     }

  925. }

  926. 

  927. /* special case for int[2] args we discard afterwards,

  928.  * fixes compilation problem with gcc 2.95 */

  929. static av_always_inline int check_block_inter(SnowContext *s, int mb_x, int mb_y, int p0, int p1, uint8_t (*obmc_edged)[MB_SIZE * 2], int *best_rd){

  930.     int p[2] = {p0, p1};

  931.     return check_block(s, mb_x, mb_y, p, 0, obmc_edged, best_rd);

  932. }

  933. 

  934. 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){

  935.     const int b_stride= s->b_width << s->block_max_depth;

  936.     BlockNode *block= &s->block[mb_x + mb_y * b_stride];

  937.     BlockNode backup[4];

  938.     unsigned value;

  939.     int rd, index;

  940. 

  941.     /* We don't initialize backup[] during variable declaration, because

  942.      * that fails to compile on MSVC: "cannot convert from 'BlockNode' to

  943.      * 'int16_t'". */

  944.     backup[0] = block[0];

  945.     backup[1] = block[1];

  946.     backup[2] = block[b_stride];

  947.     backup[3] = block[b_stride + 1];

  948. 

  949.     av_assert2(mb_x>=0 && mb_y>=0);

  950.     av_assert2(mb_x<b_stride);

  951.     av_assert2(((mb_x|mb_y)&1) == 0);

  952. 

  953.     index= (p0 + 31*p1) & (ME_CACHE_SIZE-1);

  954.     value= s->me_cache_generation + (p0>>10) + (p1<<6) + (block->ref<<12);

  955.     if(s->me_cache[index] == value)

  956.         return 0;

  957.     s->me_cache[index]= value;

  958. 

  959.     block->mx= p0;

  960.     block->my= p1;

  961.     block->ref= ref;

  962.     block->type &= ~BLOCK_INTRA;

  963.     block[1]= block[b_stride]= block[b_stride+1]= *block;

  964. 

  965.     rd= get_4block_rd(s, mb_x, mb_y, 0);

  966. 

  967. //FIXME chroma

  968.     if(rd < *best_rd){

  969.         *best_rd= rd;

  970.         return 1;

  971.     }else{

  972.         block[0]= backup[0];

  973.         block[1]= backup[1];

  974.         block[b_stride]= backup[2];

  975.         block[b_stride+1]= backup[3];

  976.         return 0;

  977.     }

  978. }

  979. 

  980. static void iterative_me(SnowContext *s){

  981.     int pass, mb_x, mb_y;

  982.     const int b_width = s->b_width  << s->block_max_depth;

  983.     const int b_height= s->b_height << s->block_max_depth;

  984.     const int b_stride= b_width;

  985.     int color[3];

  986. 

  987.     {

  988.         RangeCoder r = s->c;

  989.         uint8_t state[sizeof(s->block_state)];

  990.         memcpy(state, s->block_state, sizeof(s->block_state));

  991.         for(mb_y= 0; mb_y<s->b_height; mb_y++)

  992.             for(mb_x= 0; mb_x<s->b_width; mb_x++)

  993.                 encode_q_branch(s, 0, mb_x, mb_y);

  994.         s->c = r;

  995.         memcpy(s->block_state, state, sizeof(s->block_state));

  996.     }

  997. 

  998.     for(pass=0; pass<25; pass++){

  999.         int change= 0;

  1000. 

  1001.         for(mb_y= 0; mb_y<b_height; mb_y++){

  1002.             for(mb_x= 0; mb_x<b_width; mb_x++){

  1003.                 int dia_change, i, j, ref;

  1004.                 int best_rd= INT_MAX, ref_rd;

  1005.                 BlockNode backup, ref_b;

  1006.                 const int index= mb_x + mb_y * b_stride;

  1007.                 BlockNode *block= &s->block[index];

  1008.                 BlockNode *tb =                   mb_y            ? &s->block[index-b_stride  ] : NULL;

  1009.                 BlockNode *lb = mb_x                              ? &s->block[index         -1] : NULL;

  1010.                 BlockNode *rb = mb_x+1<b_width                    ? &s->block[index         +1] : NULL;

  1011.                 BlockNode *bb =                   mb_y+1<b_height ? &s->block[index+b_stride  ] : NULL;

  1012.                 BlockNode *tlb= mb_x           && mb_y            ? &s->block[index-b_stride-1] : NULL;

  1013.                 BlockNode *trb= mb_x+1<b_width && mb_y            ? &s->block[index-b_stride+1] : NULL;

  1014.                 BlockNode *blb= mb_x           && mb_y+1<b_height ? &s->block[index+b_stride-1] : NULL;

  1015.                 BlockNode *brb= mb_x+1<b_width && mb_y+1<b_height ? &s->block[index+b_stride+1] : NULL;

  1016.                 const int b_w= (MB_SIZE >> s->block_max_depth);

  1017.                 uint8_t obmc_edged[MB_SIZE * 2][MB_SIZE * 2];

  1018. 

  1019.                 if(pass && (block->type & BLOCK_OPT))

  1020.                     continue;

  1021.                 block->type |= BLOCK_OPT;

  1022. 

  1023.                 backup= *block;

  1024. 

  1025.                 if(!s->me_cache_generation)

  1026.                     memset(s->me_cache, 0, sizeof(s->me_cache));

  1027.                 s->me_cache_generation += 1<<22;

  1028. 

  1029.                 //FIXME precalculate

  1030.                 {

  1031.                     int x, y;

  1032.                     for (y = 0; y < b_w * 2; y++)

  1033.                         memcpy(obmc_edged[y], ff_obmc_tab[s->block_max_depth] + y * b_w * 2, b_w * 2);

  1034.                     if(mb_x==0)

  1035.                         for(y=0; y<b_w*2; y++)

  1036.                             memset(obmc_edged[y], obmc_edged[y][0] + obmc_edged[y][b_w-1], b_w);

  1037.                     if(mb_x==b_stride-1)

  1038.                         for(y=0; y<b_w*2; y++)

  1039.                             memset(obmc_edged[y]+b_w, obmc_edged[y][b_w] + obmc_edged[y][b_w*2-1], b_w);

  1040.                     if(mb_y==0){

  1041.                         for(x=0; x<b_w*2; x++)

  1042.                             obmc_edged[0][x] += obmc_edged[b_w-1][x];

  1043.                         for(y=1; y<b_w; y++)

  1044.                             memcpy(obmc_edged[y], obmc_edged[0], b_w*2);

  1045.                     }

  1046.                     if(mb_y==b_height-1){

  1047.                         for(x=0; x<b_w*2; x++)

  1048.                             obmc_edged[b_w*2-1][x] += obmc_edged[b_w][x];

  1049.                         for(y=b_w; y<b_w*2-1; y++)

  1050.                             memcpy(obmc_edged[y], obmc_edged[b_w*2-1], b_w*2);

  1051.                     }

  1052.                 }

  1053. 

  1054.                 //skip stuff outside the picture

  1055.                 if(mb_x==0 || mb_y==0 || mb_x==b_width-1 || mb_y==b_height-1){

  1056.                     uint8_t *src= s->  input_picture->data[0];

  1057.                     uint8_t *dst= s->current_picture->data[0];

  1058.                     const int stride= s->current_picture->linesize[0];

  1059.                     const int block_w= MB_SIZE >> s->block_max_depth;

  1060.                     const int block_h= MB_SIZE >> s->block_max_depth;

  1061.                     const int sx= block_w*mb_x - block_w/2;

  1062.                     const int sy= block_h*mb_y - block_h/2;

  1063.                     const int w= s->plane[0].width;

  1064.                     const int h= s->plane[0].height;

  1065.                     int y;

  1066. 

  1067.                     for(y=sy; y<0; y++)

  1068.                         memcpy(dst + sx + y*stride, src + sx + y*stride, block_w*2);

  1069.                     for(y=h; y<sy+block_h*2; y++)

  1070.                         memcpy(dst + sx + y*stride, src + sx + y*stride, block_w*2);

  1071.                     if(sx<0){

  1072.                         for(y=sy; y<sy+block_h*2; y++)

  1073.                             memcpy(dst + sx + y*stride, src + sx + y*stride, -sx);

  1074.                     }

  1075.                     if(sx+block_w*2 > w){

  1076.                         for(y=sy; y<sy+block_h*2; y++)

  1077.                             memcpy(dst + w + y*stride, src + w + y*stride, sx+block_w*2 - w);

  1078.                     }

  1079.                 }

  1080. 

  1081.                 // intra(black) = neighbors' contribution to the current block

  1082.                 for(i=0; i < s->nb_planes; i++)

  1083.                     color[i]= get_dc(s, mb_x, mb_y, i);

  1084. 

  1085.                 // get previous score (cannot be cached due to OBMC)

  1086.                 if(pass > 0 && (block->type&BLOCK_INTRA)){

  1087.                     int color0[3]= {block->color[0], block->color[1], block->color[2]};

  1088.                     check_block(s, mb_x, mb_y, color0, 1, obmc_edged, &best_rd);

  1089.                 }else

  1090.                     check_block_inter(s, mb_x, mb_y, block->mx, block->my, obmc_edged, &best_rd);

  1091. 

  1092.                 ref_b= *block;

  1093.                 ref_rd= best_rd;

  1094.                 for(ref=0; ref < s->ref_frames; ref++){

  1095.                     int16_t (*mvr)[2]= &s->ref_mvs[ref][index];

  1096.                     if(s->ref_scores[ref][index] > s->ref_scores[ref_b.ref][index]*3/2) //FIXME tune threshold

  1097.                         continue;

  1098.                     block->ref= ref;

  1099.                     best_rd= INT_MAX;

  1100. 

  1101.                     check_block_inter(s, mb_x, mb_y, mvr[0][0], mvr[0][1], obmc_edged, &best_rd);

  1102.                     check_block_inter(s, mb_x, mb_y, 0, 0, obmc_edged, &best_rd);

  1103.                     if(tb)

  1104.                         check_block_inter(s, mb_x, mb_y, mvr[-b_stride][0], mvr[-b_stride][1], obmc_edged, &best_rd);

  1105.                     if(lb)

  1106.                         check_block_inter(s, mb_x, mb_y, mvr[-1][0], mvr[-1][1], obmc_edged, &best_rd);

  1107.                     if(rb)

  1108.                         check_block_inter(s, mb_x, mb_y, mvr[1][0], mvr[1][1], obmc_edged, &best_rd);

  1109.                     if(bb)

  1110.                         check_block_inter(s, mb_x, mb_y, mvr[b_stride][0], mvr[b_stride][1], obmc_edged, &best_rd);

  1111. 

  1112.                     /* fullpel ME */

  1113.                     //FIXME avoid subpel interpolation / round to nearest integer

  1114.                     do{

  1115.                         dia_change=0;

  1116.                         for(i=0; i<FFMAX(s->avctx->dia_size, 1); i++){

  1117.                             for(j=0; j<i; j++){

  1118.                                 dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+4*(i-j), block->my+(4*j), obmc_edged, &best_rd);

  1119.                                 dia_change |= check_block_inter(s, mb_x, mb_y, block->mx-4*(i-j), block->my-(4*j), obmc_edged, &best_rd);

  1120.                                 dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+4*(i-j), block->my-(4*j), obmc_edged, &best_rd);

  1121.                                 dia_change |= check_block_inter(s, mb_x, mb_y, block->mx-4*(i-j), block->my+(4*j), obmc_edged, &best_rd);

  1122.                             }

  1123.                         }

  1124.                     }while(dia_change);

  1125.                     /* subpel ME */

  1126.                     do{

  1127.                         static const int square[8][2]= {{+1, 0},{-1, 0},{ 0,+1},{ 0,-1},{+1,+1},{-1,-1},{+1,-1},{-1,+1},};

  1128.                         dia_change=0;

  1129.                         for(i=0; i<8; i++)

  1130.                             dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+square[i][0], block->my+square[i][1], obmc_edged, &best_rd);

  1131.                     }while(dia_change);

  1132.                     //FIXME or try the standard 2 pass qpel or similar

  1133. 

  1134.                     mvr[0][0]= block->mx;

  1135.                     mvr[0][1]= block->my;

  1136.                     if(ref_rd > best_rd){

  1137.                         ref_rd= best_rd;

  1138.                         ref_b= *block;

  1139.                     }

  1140.                 }

  1141.                 best_rd= ref_rd;

  1142.                 *block= ref_b;

  1143.                 check_block(s, mb_x, mb_y, color, 1, obmc_edged, &best_rd);

  1144.                 //FIXME RD style color selection

  1145.                 if(!same_block(block, &backup)){

  1146.                     if(tb ) tb ->type &= ~BLOCK_OPT;

  1147.                     if(lb ) lb ->type &= ~BLOCK_OPT;

  1148.                     if(rb ) rb ->type &= ~BLOCK_OPT;

  1149.                     if(bb ) bb ->type &= ~BLOCK_OPT;

  1150.                     if(tlb) tlb->type &= ~BLOCK_OPT;

  1151.                     if(trb) trb->type &= ~BLOCK_OPT;

  1152.                     if(blb) blb->type &= ~BLOCK_OPT;

  1153.                     if(brb) brb->type &= ~BLOCK_OPT;

  1154.                     change ++;

  1155.                 }

  1156.             }

  1157.         }

  1158.         av_log(s->avctx, AV_LOG_ERROR, "pass:%d changed:%d\n", pass, change);

  1159.         if(!change)

  1160.             break;

  1161.     }

  1162. 

  1163.     if(s->block_max_depth == 1){

  1164.         int change= 0;

  1165.         for(mb_y= 0; mb_y<b_height; mb_y+=2){

  1166.             for(mb_x= 0; mb_x<b_width; mb_x+=2){

  1167.                 int i;

  1168.                 int best_rd, init_rd;

  1169.                 const int index= mb_x + mb_y * b_stride;

  1170.                 BlockNode *b[4];

  1171. 

  1172.                 b[0]= &s->block[index];

  1173.                 b[1]= b[0]+1;

  1174.                 b[2]= b[0]+b_stride;

  1175.                 b[3]= b[2]+1;

  1176.                 if(same_block(b[0], b[1]) &&

  1177.                    same_block(b[0], b[2]) &&

  1178.                    same_block(b[0], b[3]))

  1179.                     continue;

  1180. 

  1181.                 if(!s->me_cache_generation)

  1182.                     memset(s->me_cache, 0, sizeof(s->me_cache));

  1183.                 s->me_cache_generation += 1<<22;

  1184. 

  1185.                 init_rd= best_rd= get_4block_rd(s, mb_x, mb_y, 0);

  1186. 

  1187.                 //FIXME more multiref search?

  1188.                 check_4block_inter(s, mb_x, mb_y,

  1189.                                    (b[0]->mx + b[1]->mx + b[2]->mx + b[3]->mx + 2) >> 2,

  1190.                                    (b[0]->my + b[1]->my + b[2]->my + b[3]->my + 2) >> 2, 0, &best_rd);

  1191. 

  1192.                 for(i=0; i<4; i++)

  1193.                     if(!(b[i]->type&BLOCK_INTRA))

  1194.                         check_4block_inter(s, mb_x, mb_y, b[i]->mx, b[i]->my, b[i]->ref, &best_rd);

  1195. 

  1196.                 if(init_rd != best_rd)

  1197.                     change++;

  1198.             }

  1199.         }

  1200.         av_log(s->avctx, AV_LOG_ERROR, "pass:4mv changed:%d\n", change*4);

  1201.     }

  1202. }

  1203. 

  1204. static void encode_blocks(SnowContext *s, int search){

  1205.     int x, y;

  1206.     int w= s->b_width;

  1207.     int h= s->b_height;

  1208. 

  1209.     if(s->avctx->me_method == ME_ITER && !s->keyframe && search)

  1210.         iterative_me(s);

  1211. 

  1212.     for(y=0; y<h; y++){

  1213.         if(s->c.bytestream_end - s->c.bytestream < w*MB_SIZE*MB_SIZE*3){ //FIXME nicer limit

  1214.             av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");

  1215.             return;

  1216.         }

  1217.         for(x=0; x<w; x++){

  1218.             if(s->avctx->me_method == ME_ITER || !search)

  1219.                 encode_q_branch2(s, 0, x, y);

  1220.             else

  1221.                 encode_q_branch (s, 0, x, y);

  1222.         }

  1223.     }

  1224. }

  1225. 

  1226. static void quantize(SnowContext *s, SubBand *b, IDWTELEM *dst, DWTELEM *src, int stride, int bias){

  1227.     const int w= b->width;

  1228.     const int h= b->height;

  1229.     const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);

  1230.     const int qmul= ff_qexp[qlog&(QROOT-1)]<<((qlog>>QSHIFT) + ENCODER_EXTRA_BITS);

  1231.     int x,y, thres1, thres2;

  1232. 

  1233.     if(s->qlog == LOSSLESS_QLOG){

  1234.         for(y=0; y<h; y++)

  1235.             for(x=0; x<w; x++)

  1236.                 dst[x + y*stride]= src[x + y*stride];

  1237.         return;

  1238.     }

  1239. 

  1240.     bias= bias ? 0 : (3*qmul)>>3;

  1241.     thres1= ((qmul - bias)>>QEXPSHIFT) - 1;

  1242.     thres2= 2*thres1;

  1243. 

  1244.     if(!bias){

  1245.         for(y=0; y<h; y++){

  1246.             for(x=0; x<w; x++){

  1247.                 int i= src[x + y*stride];

  1248. 

  1249.                 if((unsigned)(i+thres1) > thres2){

  1250.                     if(i>=0){

  1251.                         i<<= QEXPSHIFT;

  1252.                         i/= qmul; //FIXME optimize

  1253.                         dst[x + y*stride]=  i;

  1254.                     }else{

  1255.                         i= -i;

  1256.                         i<<= QEXPSHIFT;

  1257.                         i/= qmul; //FIXME optimize

  1258.                         dst[x + y*stride]= -i;

  1259.                     }

  1260.                 }else

  1261.                     dst[x + y*stride]= 0;

  1262.             }

  1263.         }

  1264.     }else{

  1265.         for(y=0; y<h; y++){

  1266.             for(x=0; x<w; x++){

  1267.                 int i= src[x + y*stride];

  1268. 

  1269.                 if((unsigned)(i+thres1) > thres2){

  1270.                     if(i>=0){

  1271.                         i<<= QEXPSHIFT;

  1272.                         i= (i + bias) / qmul; //FIXME optimize

  1273.                         dst[x + y*stride]=  i;

  1274.                     }else{

  1275.                         i= -i;

  1276.                         i<<= QEXPSHIFT;

  1277.                         i= (i + bias) / qmul; //FIXME optimize

  1278.                         dst[x + y*stride]= -i;

  1279.                     }

  1280.                 }else

  1281.                     dst[x + y*stride]= 0;

  1282.             }

  1283.         }

  1284.     }

  1285. }

  1286. 

  1287. static void dequantize(SnowContext *s, SubBand *b, IDWTELEM *src, int stride){

  1288.     const int w= b->width;

  1289.     const int h= b->height;

  1290.     const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);

  1291.     const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);

  1292.     const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;

  1293.     int x,y;

  1294. 

  1295.     if(s->qlog == LOSSLESS_QLOG) return;

  1296. 

  1297.     for(y=0; y<h; y++){

  1298.         for(x=0; x<w; x++){

  1299.             int i= src[x + y*stride];

  1300.             if(i<0){

  1301.                 src[x + y*stride]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias

  1302.             }else if(i>0){

  1303.                 src[x + y*stride]=  (( i*qmul + qadd)>>(QEXPSHIFT));

  1304.             }

  1305.         }

  1306.     }

  1307. }

  1308. 

  1309. static void decorrelate(SnowContext *s, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median){

  1310.     const int w= b->width;

  1311.     const int h= b->height;

  1312.     int x,y;

  1313. 

  1314.     for(y=h-1; y>=0; y--){

  1315.         for(x=w-1; x>=0; x--){

  1316.             int i= x + y*stride;

  1317. 

  1318.             if(x){

  1319.                 if(use_median){

  1320.                     if(y && x+1<w) src[i] -= mid_pred(src[i - 1], src[i - stride], src[i - stride + 1]);

  1321.                     else  src[i] -= src[i - 1];

  1322.                 }else{

  1323.                     if(y) src[i] -= mid_pred(src[i - 1], src[i - stride], src[i - 1] + src[i - stride] - src[i - 1 - stride]);

  1324.                     else  src[i] -= src[i - 1];

  1325.                 }

  1326.             }else{

  1327.                 if(y) src[i] -= src[i - stride];

  1328.             }

  1329.         }

  1330.     }

  1331. }

  1332. 

  1333. static void correlate(SnowContext *s, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median){

  1334.     const int w= b->width;

  1335.     const int h= b->height;

  1336.     int x,y;

  1337. 

  1338.     for(y=0; y<h; y++){

  1339.         for(x=0; x<w; x++){

  1340.             int i= x + y*stride;

  1341. 

  1342.             if(x){

  1343.                 if(use_median){

  1344.                     if(y && x+1<w) src[i] += mid_pred(src[i - 1], src[i - stride], src[i - stride + 1]);

  1345.                     else  src[i] += src[i - 1];

  1346.                 }else{

  1347.                     if(y) src[i] += mid_pred(src[i - 1], src[i - stride], src[i - 1] + src[i - stride] - src[i - 1 - stride]);

  1348.                     else  src[i] += src[i - 1];

  1349.                 }

  1350.             }else{

  1351.                 if(y) src[i] += src[i - stride];

  1352.             }

  1353.         }

  1354.     }

  1355. }

  1356. 

  1357. static void encode_qlogs(SnowContext *s){

  1358.     int plane_index, level, orientation;

  1359. 

  1360.     for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){

  1361.         for(level=0; level<s->spatial_decomposition_count; level++){

  1362.             for(orientation=level ? 1:0; orientation<4; orientation++){

  1363.                 if(orientation==2) continue;

  1364.                 put_symbol(&s->c, s->header_state, s->plane[plane_index].band[level][orientation].qlog, 1);

  1365.             }

  1366.         }

  1367.     }

  1368. }

  1369. 

  1370. static void encode_header(SnowContext *s){

  1371.     int plane_index, i;

  1372.     uint8_t kstate[32];

  1373. 

  1374.     memset(kstate, MID_STATE, sizeof(kstate));

  1375. 

  1376.     put_rac(&s->c, kstate, s->keyframe);

  1377.     if(s->keyframe || s->always_reset){

  1378.         ff_snow_reset_contexts(s);

  1379.         s->last_spatial_decomposition_type=

  1380.         s->last_qlog=

  1381.         s->last_qbias=

  1382.         s->last_mv_scale=

  1383.         s->last_block_max_depth= 0;

  1384.         for(plane_index=0; plane_index<2; plane_index++){

  1385.             Plane *p= &s->plane[plane_index];

  1386.             p->last_htaps=0;

  1387.             p->last_diag_mc=0;

  1388.             memset(p->last_hcoeff, 0, sizeof(p->last_hcoeff));

  1389.         }

  1390.     }

  1391.     if(s->keyframe){

  1392.         put_symbol(&s->c, s->header_state, s->version, 0);

  1393.         put_rac(&s->c, s->header_state, s->always_reset);

  1394.         put_symbol(&s->c, s->header_state, s->temporal_decomposition_type, 0);

  1395.         put_symbol(&s->c, s->header_state, s->temporal_decomposition_count, 0);

  1396.         put_symbol(&s->c, s->header_state, s->spatial_decomposition_count, 0);

  1397.         put_symbol(&s->c, s->header_state, s->colorspace_type, 0);

  1398.         if (s->nb_planes > 2) {

  1399.             put_symbol(&s->c, s->header_state, s->chroma_h_shift, 0);

  1400.             put_symbol(&s->c, s->header_state, s->chroma_v_shift, 0);

  1401.         }

  1402.         put_rac(&s->c, s->header_state, s->spatial_scalability);

  1403. //        put_rac(&s->c, s->header_state, s->rate_scalability);

  1404.         put_symbol(&s->c, s->header_state, s->max_ref_frames-1, 0);

  1405. 

  1406.         encode_qlogs(s);

  1407.     }

  1408. 

  1409.     if(!s->keyframe){

  1410.         int update_mc=0;

  1411.         for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){

  1412.             Plane *p= &s->plane[plane_index];

  1413.             update_mc |= p->last_htaps   != p->htaps;

  1414.             update_mc |= p->last_diag_mc != p->diag_mc;

  1415.             update_mc |= !!memcmp(p->last_hcoeff, p->hcoeff, sizeof(p->hcoeff));

  1416.         }

  1417.         put_rac(&s->c, s->header_state, update_mc);

  1418.         if(update_mc){

  1419.             for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){

  1420.                 Plane *p= &s->plane[plane_index];

  1421.                 put_rac(&s->c, s->header_state, p->diag_mc);

  1422.                 put_symbol(&s->c, s->header_state, p->htaps/2-1, 0);

  1423.                 for(i= p->htaps/2; i; i--)

  1424.                     put_symbol(&s->c, s->header_state, FFABS(p->hcoeff[i]), 0);

  1425.             }

  1426.         }

  1427.         if(s->last_spatial_decomposition_count != s->spatial_decomposition_count){

  1428.             put_rac(&s->c, s->header_state, 1);

  1429.             put_symbol(&s->c, s->header_state, s->spatial_decomposition_count, 0);

  1430.             encode_qlogs(s);

  1431.         }else

  1432.             put_rac(&s->c, s->header_state, 0);

  1433.     }

  1434. 

  1435.     put_symbol(&s->c, s->header_state, s->spatial_decomposition_type - s->last_spatial_decomposition_type, 1);

  1436.     put_symbol(&s->c, s->header_state, s->qlog            - s->last_qlog    , 1);

  1437.     put_symbol(&s->c, s->header_state, s->mv_scale        - s->last_mv_scale, 1);

  1438.     put_symbol(&s->c, s->header_state, s->qbias           - s->last_qbias   , 1);

  1439.     put_symbol(&s->c, s->header_state, s->block_max_depth - s->last_block_max_depth, 1);

  1440. 

  1441. }

  1442. 

  1443. static void update_last_header_values(SnowContext *s){

  1444.     int plane_index;

  1445. 

  1446.     if(!s->keyframe){

  1447.         for(plane_index=0; plane_index<2; plane_index++){

  1448.             Plane *p= &s->plane[plane_index];

  1449.             p->last_diag_mc= p->diag_mc;

  1450.             p->last_htaps  = p->htaps;

  1451.             memcpy(p->last_hcoeff, p->hcoeff, sizeof(p->hcoeff));

  1452.         }

  1453.     }

  1454. 

  1455.     s->last_spatial_decomposition_type  = s->spatial_decomposition_type;

  1456.     s->last_qlog                        = s->qlog;

  1457.     s->last_qbias                       = s->qbias;

  1458.     s->last_mv_scale                    = s->mv_scale;

  1459.     s->last_block_max_depth             = s->block_max_depth;

  1460.     s->last_spatial_decomposition_count = s->spatial_decomposition_count;

  1461. }

  1462. 

  1463. static int qscale2qlog(int qscale){

  1464.     return rint(QROOT*log2(qscale / (float)FF_QP2LAMBDA))

  1465.            + 61*QROOT/8; ///< 64 > 60

  1466. }

  1467. 

  1468. static int ratecontrol_1pass(SnowContext *s, AVFrame *pict)

  1469. {

  1470.     /* Estimate the frame's complexity as a sum of weighted dwt coefficients.

  1471.      * FIXME we know exact mv bits at this point,

  1472.      * but ratecontrol isn't set up to include them. */

  1473.     uint32_t coef_sum= 0;

  1474.     int level, orientation, delta_qlog;

  1475. 

  1476.     for(level=0; level<s->spatial_decomposition_count; level++){

  1477.         for(orientation=level ? 1 : 0; orientation<4; orientation++){

  1478.             SubBand *b= &s->plane[0].band[level][orientation];

  1479.             IDWTELEM *buf= b->ibuf;

  1480.             const int w= b->width;

  1481.             const int h= b->height;

  1482.             const int stride= b->stride;

  1483.             const int qlog= av_clip(2*QROOT + b->qlog, 0, QROOT*16);

  1484.             const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);

  1485.             const int qdiv= (1<<16)/qmul;

  1486.             int x, y;

  1487.             //FIXME this is ugly

  1488.             for(y=0; y<h; y++)

  1489.                 for(x=0; x<w; x++)

  1490.                     buf[x+y*stride]= b->buf[x+y*stride];

  1491.             if(orientation==0)

  1492.                 decorrelate(s, b, buf, stride, 1, 0);

  1493.             for(y=0; y<h; y++)

  1494.                 for(x=0; x<w; x++)

  1495.                     coef_sum+= abs(buf[x+y*stride]) * qdiv >> 16;

  1496.         }

  1497.     }

  1498. 

  1499.     /* ugly, ratecontrol just takes a sqrt again */

  1500.     av_assert0(coef_sum < INT_MAX);

  1501.     coef_sum = (uint64_t)coef_sum * coef_sum >> 16;

  1502. 

  1503.     if(pict->pict_type == AV_PICTURE_TYPE_I){

  1504.         s->m.current_picture.mb_var_sum= coef_sum;

  1505.         s->m.current_picture.mc_mb_var_sum= 0;

  1506.     }else{

  1507.         s->m.current_picture.mc_mb_var_sum= coef_sum;

  1508.         s->m.current_picture.mb_var_sum= 0;

  1509.     }

  1510. 

  1511.     pict->quality= ff_rate_estimate_qscale(&s->m, 1);

  1512.     if (pict->quality < 0)

  1513.         return INT_MIN;

  1514.     s->lambda= pict->quality * 3/2;

  1515.     delta_qlog= qscale2qlog(pict->quality) - s->qlog;

  1516.     s->qlog+= delta_qlog;

  1517.     return delta_qlog;

  1518. }

  1519. 

  1520. static void calculate_visual_weight(SnowContext *s, Plane *p){

  1521.     int width = p->width;

  1522.     int height= p->height;

  1523.     int level, orientation, x, y;

  1524. 

  1525.     for(level=0; level<s->spatial_decomposition_count; level++){

  1526.         for(orientation=level ? 1 : 0; orientation<4; orientation++){

  1527.             SubBand *b= &p->band[level][orientation];

  1528.             IDWTELEM *ibuf= b->ibuf;

  1529.             int64_t error=0;

  1530. 

  1531.             memset(s->spatial_idwt_buffer, 0, sizeof(*s->spatial_idwt_buffer)*width*height);

  1532.             ibuf[b->width/2 + b->height/2*b->stride]= 256*16;

  1533.             ff_spatial_idwt(s->spatial_idwt_buffer, s->temp_idwt_buffer, width, height, width, s->spatial_decomposition_type, s->spatial_decomposition_count);

  1534.             for(y=0; y<height; y++){

  1535.                 for(x=0; x<width; x++){

  1536.                     int64_t d= s->spatial_idwt_buffer[x + y*width]*16;

  1537.                     error += d*d;

  1538.                 }

  1539.             }

  1540. 

  1541.             b->qlog= (int)(log(352256.0/sqrt(error)) / log(pow(2.0, 1.0/QROOT))+0.5);

  1542.         }

  1543.     }

  1544. }

  1545. 

  1546. static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,

  1547.                         const AVFrame *pict, int *got_packet)

  1548. {

  1549.     SnowContext *s = avctx->priv_data;

  1550.     RangeCoder * const c= &s->c;

  1551.     AVFrame *pic = pict;

  1552.     const int width= s->avctx->width;

  1553.     const int height= s->avctx->height;

  1554.     int level, orientation, plane_index, i, y, ret;

  1555.     uint8_t rc_header_bak[sizeof(s->header_state)];

  1556.     uint8_t rc_block_bak[sizeof(s->block_state)];

  1557. 

  1558.     if ((ret = ff_alloc_packet2(avctx, pkt, s->b_width*s->b_height*MB_SIZE*MB_SIZE*3 + FF_MIN_BUFFER_SIZE)) < 0)

  1559.         return ret;

  1560. 

  1561.     ff_init_range_encoder(c, pkt->data, pkt->size);

  1562.     ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1563. 

  1564.     for(i=0; i < s->nb_planes; i++){

  1565.         int hshift= i ? s->chroma_h_shift : 0;

  1566.         int vshift= i ? s->chroma_v_shift : 0;

  1567.         for(y=0; y<(height>>vshift); y++)

  1568.             memcpy(&s->input_picture->data[i][y * s->input_picture->linesize[i]],

  1569.                    &pict->data[i][y * pict->linesize[i]],

  1570.                    width>>hshift);

  1571.         s->dsp.draw_edges(s->input_picture->data[i], s->input_picture->linesize[i],

  1572.                             width >> hshift, height >> vshift,

  1573.                             EDGE_WIDTH >> hshift, EDGE_WIDTH >> vshift,

  1574.                             EDGE_TOP | EDGE_BOTTOM);

  1575. 

  1576.     }

  1577.     emms_c();

  1578.     s->new_picture = pict;

  1579. 

  1580.     s->m.picture_number= avctx->frame_number;

  1581.     if(avctx->flags&CODEC_FLAG_PASS2){

  1582.         s->m.pict_type = pic->pict_type = s->m.rc_context.entry[avctx->frame_number].new_pict_type;

  1583.         s->keyframe = pic->pict_type == AV_PICTURE_TYPE_I;

  1584.         if(!(avctx->flags&CODEC_FLAG_QSCALE)) {

  1585.             pic->quality = ff_rate_estimate_qscale(&s->m, 0);

  1586.             if (pic->quality < 0)

  1587.                 return -1;

  1588.         }

  1589.     }else{

  1590.         s->keyframe= avctx->gop_size==0 || avctx->frame_number % avctx->gop_size == 0;

  1591.         s->m.pict_type = pic->pict_type = s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;

  1592.     }

  1593. 

  1594.     if(s->pass1_rc && avctx->frame_number == 0)

  1595.         pic->quality = 2*FF_QP2LAMBDA;

  1596.     if (pic->quality) {

  1597.         s->qlog   = qscale2qlog(pic->quality);

  1598.         s->lambda = pic->quality * 3/2;

  1599.     }

  1600.     if (s->qlog < 0 || (!pic->quality && (avctx->flags & CODEC_FLAG_QSCALE))) {

  1601.         s->qlog= LOSSLESS_QLOG;

  1602.         s->lambda = 0;

  1603.     }//else keep previous frame's qlog until after motion estimation

  1604. 

  1605.     ff_snow_frame_start(s);

  1606.     avctx->coded_frame= s->current_picture;

  1607. 

  1608.     s->m.current_picture_ptr= &s->m.current_picture;

  1609.     s->m.current_picture.f = s->current_picture;

  1610.     s->m.current_picture.f->pts = pict->pts;

  1611.     if(pic->pict_type == AV_PICTURE_TYPE_P){

  1612.         int block_width = (width +15)>>4;

  1613.         int block_height= (height+15)>>4;

  1614.         int stride= s->current_picture->linesize[0];

  1615. 

  1616.         av_assert0(s->current_picture->data[0]);

  1617.         av_assert0(s->last_picture[0]->data[0]);

  1618. 

  1619.         s->m.avctx= s->avctx;

  1620.         s->m.   last_picture.f = s->last_picture[0];

  1621.         s->m.    new_picture.f = s->input_picture;

  1622.         s->m.   last_picture_ptr= &s->m.   last_picture;

  1623.         s->m.linesize = stride;

  1624.         s->m.uvlinesize= s->current_picture->linesize[1];

  1625.         s->m.width = width;

  1626.         s->m.height= height;

  1627.         s->m.mb_width = block_width;

  1628.         s->m.mb_height= block_height;

  1629.         s->m.mb_stride=   s->m.mb_width+1;

  1630.         s->m.b8_stride= 2*s->m.mb_width+1;

  1631.         s->m.f_code=1;

  1632.         s->m.pict_type = pic->pict_type;

  1633.         s->m.me_method= s->avctx->me_method;

  1634.         s->m.me.scene_change_score=0;

  1635.         s->m.flags= s->avctx->flags;

  1636.         s->m.quarter_sample= (s->avctx->flags & CODEC_FLAG_QPEL)!=0;

  1637.         s->m.out_format= FMT_H263;

  1638.         s->m.unrestricted_mv= 1;

  1639. 

  1640.         s->m.lambda = s->lambda;

  1641.         s->m.qscale= (s->m.lambda*139 + FF_LAMBDA_SCALE*64) >> (FF_LAMBDA_SHIFT + 7);

  1642.         s->lambda2= s->m.lambda2= (s->m.lambda*s->m.lambda + FF_LAMBDA_SCALE/2) >> FF_LAMBDA_SHIFT;

  1643. 

  1644.         s->m.dsp= s->dsp; //move

  1645.         s->m.qdsp= s->qdsp; //move

  1646.         s->m.hdsp = s->hdsp;

  1647.         ff_init_me(&s->m);

  1648.         s->hdsp = s->m.hdsp;

  1649.         s->dsp= s->m.dsp;

  1650.     }

  1651. 

  1652.     if(s->pass1_rc){

  1653.         memcpy(rc_header_bak, s->header_state, sizeof(s->header_state));

  1654.         memcpy(rc_block_bak, s->block_state, sizeof(s->block_state));

  1655.     }

  1656. 

  1657. redo_frame:

  1658. 

  1659.     s->spatial_decomposition_count= 5;

  1660. 

  1661.     while(   !(width >>(s->chroma_h_shift + s->spatial_decomposition_count))

  1662.           || !(height>>(s->chroma_v_shift + s->spatial_decomposition_count)))

  1663.         s->spatial_decomposition_count--;

  1664. 

  1665.     if (s->spatial_decomposition_count <= 0) {

  1666.         av_log(avctx, AV_LOG_ERROR, "Resolution too low\n");

  1667.         return AVERROR(EINVAL);

  1668.     }

  1669. 

  1670.     s->m.pict_type = pic->pict_type;

  1671.     s->qbias = pic->pict_type == AV_PICTURE_TYPE_P ? 2 : 0;

  1672. 

  1673.     ff_snow_common_init_after_header(avctx);

  1674. 

  1675.     if(s->last_spatial_decomposition_count != s->spatial_decomposition_count){

  1676.         for(plane_index=0; plane_index < s->nb_planes; plane_index++){

  1677.             calculate_visual_weight(s, &s->plane[plane_index]);

  1678.         }

  1679.     }

  1680. 

  1681.     encode_header(s);

  1682.     s->m.misc_bits = 8*(s->c.bytestream - s->c.bytestream_start);

  1683.     encode_blocks(s, 1);

  1684.     s->m.mv_bits = 8*(s->c.bytestream - s->c.bytestream_start) - s->m.misc_bits;

  1685. 

  1686.     for(plane_index=0; plane_index < s->nb_planes; plane_index++){

  1687.         Plane *p= &s->plane[plane_index];

  1688.         int w= p->width;

  1689.         int h= p->height;

  1690.         int x, y;

  1691. //        int bits= put_bits_count(&s->c.pb);

  1692. 

  1693.         if (!s->memc_only) {

  1694.             //FIXME optimize

  1695.             if(pict->data[plane_index]) //FIXME gray hack

  1696.                 for(y=0; y<h; y++){

  1697.                     for(x=0; x<w; x++){

  1698.                         s->spatial_idwt_buffer[y*w + x]= pict->data[plane_index][y*pict->linesize[plane_index] + x]<<FRAC_BITS;

  1699.                     }

  1700.                 }

  1701.             predict_plane(s, s->spatial_idwt_buffer, plane_index, 0);

  1702. 

  1703.             if(   plane_index==0

  1704.                && pic->pict_type == AV_PICTURE_TYPE_P

  1705.                && !(avctx->flags&CODEC_FLAG_PASS2)

  1706.                && s->m.me.scene_change_score > s->avctx->scenechange_threshold){

  1707.                 ff_init_range_encoder(c, pkt->data, pkt->size);

  1708.                 ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

  1709.                 pic->pict_type= AV_PICTURE_TYPE_I;

  1710.                 s->keyframe=1;

  1711.                 s->current_picture->key_frame=1;

  1712.                 goto redo_frame;

  1713.             }

  1714. 

  1715.             if(s->qlog == LOSSLESS_QLOG){

  1716.                 for(y=0; y<h; y++){

  1717.                     for(x=0; x<w; x++){

  1718.                         s->spatial_dwt_buffer[y*w + x]= (s->spatial_idwt_buffer[y*w + x] + (1<<(FRAC_BITS-1))-1)>>FRAC_BITS;

  1719.                     }

  1720.                 }

  1721.             }else{

  1722.                 for(y=0; y<h; y++){

  1723.                     for(x=0; x<w; x++){

  1724.                         s->spatial_dwt_buffer[y*w + x]=s->spatial_idwt_buffer[y*w + x]<<ENCODER_EXTRA_BITS;

  1725.                     }

  1726.                 }

  1727.             }

  1728. 

  1729.             ff_spatial_dwt(s->spatial_dwt_buffer, s->temp_dwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count);

  1730. 

  1731.             if(s->pass1_rc && plane_index==0){

  1732.                 int delta_qlog = ratecontrol_1pass(s, pic);

  1733.                 if (delta_qlog <= INT_MIN)

  1734.                     return -1;

  1735.                 if(delta_qlog){

  1736.                     //reordering qlog in the bitstream would eliminate this reset

  1737.                     ff_init_range_encoder(c, pkt->data, pkt->size);

  1738.                     memcpy(s->header_state, rc_header_bak, sizeof(s->header_state));

  1739.                     memcpy(s->block_state, rc_block_bak, sizeof(s->block_state));

  1740.                     encode_header(s);

  1741.                     encode_blocks(s, 0);

  1742.                 }

  1743.             }

  1744. 

  1745.             for(level=0; level<s->spatial_decomposition_count; level++){

  1746.                 for(orientation=level ? 1 : 0; orientation<4; orientation++){

  1747.                     SubBand *b= &p->band[level][orientation];

  1748. 

  1749.                     quantize(s, b, b->ibuf, b->buf, b->stride, s->qbias);

  1750.                     if(orientation==0)

  1751.                         decorrelate(s, b, b->ibuf, b->stride, pic->pict_type == AV_PICTURE_TYPE_P, 0);

  1752.                     if (!s->no_bitstream)

  1753.                     encode_subband(s, b, b->ibuf, b->parent ? b->parent->ibuf : NULL, b->stride, orientation);

  1754.                     av_assert0(b->parent==NULL || b->parent->stride == b->stride*2);

  1755.                     if(orientation==0)

  1756.                         correlate(s, b, b->ibuf, b->stride, 1, 0);

  1757.                 }

  1758.             }

  1759. 

  1760.             for(level=0; level<s->spatial_decomposition_count; level++){

  1761.                 for(orientation=level ? 1 : 0; orientation<4; orientation++){

  1762.                     SubBand *b= &p->band[level][orientation];

  1763. 

  1764.                     dequantize(s, b, b->ibuf, b->stride);

  1765.                 }

  1766.             }

  1767. 

  1768.             ff_spatial_idwt(s->spatial_idwt_buffer, s->temp_idwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count);

  1769.             if(s->qlog == LOSSLESS_QLOG){

  1770.                 for(y=0; y<h; y++){

  1771.                     for(x=0; x<w; x++){

  1772.                         s->spatial_idwt_buffer[y*w + x]<<=FRAC_BITS;

  1773.                     }

  1774.                 }

  1775.             }

  1776.             predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);

  1777.         }else{

  1778.             //ME/MC only

  1779.             if(pic->pict_type == AV_PICTURE_TYPE_I){

  1780.                 for(y=0; y<h; y++){

  1781.                     for(x=0; x<w; x++){

  1782.                         s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x]=

  1783.                             pict->data[plane_index][y*pict->linesize[plane_index] + x];

  1784.                     }

  1785.                 }

  1786.             }else{

  1787.                 memset(s->spatial_idwt_buffer, 0, sizeof(IDWTELEM)*w*h);

  1788.                 predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);

  1789.             }

  1790.         }

  1791.         if(s->avctx->flags&CODEC_FLAG_PSNR){

  1792.             int64_t error= 0;

  1793. 

  1794.             if(pict->data[plane_index]) //FIXME gray hack

  1795.                 for(y=0; y<h; y++){

  1796.                     for(x=0; x<w; x++){

  1797.                         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];

  1798.                         error += d*d;

  1799.                     }

  1800.                 }

  1801.             s->avctx->error[plane_index] += error;

  1802.             s->current_picture->error[plane_index] = error;

  1803.         }

  1804. 

  1805.     }

  1806. 

  1807.     update_last_header_values(s);

  1808. 

  1809.     ff_snow_release_buffer(avctx);

  1810. 

  1811.     s->current_picture->coded_picture_number = avctx->frame_number;

  1812.     s->current_picture->pict_type = pict->pict_type;

  1813.     s->current_picture->quality = pict->quality;

  1814.     s->m.frame_bits = 8*(s->c.bytestream - s->c.bytestream_start);

  1815.     s->m.p_tex_bits = s->m.frame_bits - s->m.misc_bits - s->m.mv_bits;

  1816.     s->m.current_picture.f->display_picture_number =

  1817.     s->m.current_picture.f->coded_picture_number   = avctx->frame_number;

  1818.     s->m.current_picture.f->quality                = pic->quality;

  1819.     s->m.total_bits += 8*(s->c.bytestream - s->c.bytestream_start);

  1820.     if(s->pass1_rc)

  1821.         if (ff_rate_estimate_qscale(&s->m, 0) < 0)

  1822.             return -1;

  1823.     if(avctx->flags&CODEC_FLAG_PASS1)

  1824.         ff_write_pass1_stats(&s->m);

  1825.     s->m.last_pict_type = s->m.pict_type;

  1826.     avctx->frame_bits = s->m.frame_bits;

  1827.     avctx->mv_bits = s->m.mv_bits;

  1828.     avctx->misc_bits = s->m.misc_bits;

  1829.     avctx->p_tex_bits = s->m.p_tex_bits;

  1830. 

  1831.     emms_c();

  1832. 

  1833.     pkt->size = ff_rac_terminate(c);

  1834.     if (avctx->coded_frame->key_frame)

  1835.         pkt->flags |= AV_PKT_FLAG_KEY;

  1836.     *got_packet = 1;

  1837. 

  1838.     return 0;

  1839. }

  1840. 

  1841. static av_cold int encode_end(AVCodecContext *avctx)

  1842. {

  1843.     SnowContext *s = avctx->priv_data;

  1844. 

  1845.     ff_snow_common_end(s);

  1846.     ff_rate_control_uninit(&s->m);

  1847.     av_frame_free(&s->input_picture);

  1848.     av_free(avctx->stats_out);

  1849. 

  1850.     return 0;

  1851. }

  1852. 

  1853. #define OFFSET(x) offsetof(SnowContext, x)

  1854. #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

  1855. static const AVOption options[] = {

  1856.     { "memc_only",      "Only do ME/MC (I frames -> ref, P frame -> ME+MC).",   OFFSET(memc_only), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },

  1857.     { "no_bitstream",   "Skip final bitstream writeout.",                    OFFSET(no_bitstream), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },

  1858.     { NULL },

  1859. };

  1860. 

  1861. static const AVClass snowenc_class = {

  1862.     .class_name = "snow encoder",

  1863.     .item_name  = av_default_item_name,

  1864.     .option     = options,

  1865.     .version    = LIBAVUTIL_VERSION_INT,

  1866. };

  1867. 

  1868. AVCodec ff_snow_encoder = {

  1869.     .name           = "snow",

  1870.     .long_name      = NULL_IF_CONFIG_SMALL("Snow"),

  1871.     .type           = AVMEDIA_TYPE_VIDEO,

  1872.     .id             = AV_CODEC_ID_SNOW,

  1873.     .priv_data_size = sizeof(SnowContext),

  1874.     .init           = encode_init,

  1875.     .encode2        = encode_frame,

  1876.     .close          = encode_end,

  1877.     .pix_fmts       = (const enum AVPixelFormat[]){

  1878.         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV444P,

  1879.         AV_PIX_FMT_GRAY8,

  1880.         AV_PIX_FMT_NONE

  1881.     },

  1882.     .priv_class     = &snowenc_class,

  1883. };

  1884. 

  1885. 

  1886. #ifdef TEST

  1887. #undef malloc

  1888. #undef free

  1889. #undef printf

  1890. 

  1891. #include "libavutil/lfg.h"

  1892. #include "libavutil/mathematics.h"

  1893. 

  1894. int main(void){

  1895. #define width  256

  1896. #define height 256

  1897.     int buffer[2][width*height];

  1898.     SnowContext s;

  1899.     int i;

  1900.     AVLFG prng;

  1901.     s.spatial_decomposition_count=6;

  1902.     s.spatial_decomposition_type=1;

  1903. 

  1904.     s.temp_dwt_buffer  = av_mallocz(width * sizeof(DWTELEM));

  1905.     s.temp_idwt_buffer = av_mallocz(width * sizeof(IDWTELEM));

  1906. 

  1907.     av_lfg_init(&prng, 1);

  1908. 

  1909.     printf("testing 5/3 DWT\n");

  1910.     for(i=0; i<width*height; i++)

  1911.         buffer[0][i] = buffer[1][i] = av_lfg_get(&prng) % 54321 - 12345;

  1912. 

  1913.     ff_spatial_dwt(buffer[0], s.temp_dwt_buffer, width, height, width, s.spatial_decomposition_type, s.spatial_decomposition_count);

  1914.     ff_spatial_idwt((IDWTELEM*)buffer[0], s.temp_idwt_buffer, width, height, width, s.spatial_decomposition_type, s.spatial_decomposition_count);

  1915. 

  1916.     for(i=0; i<width*height; i++)

  1917.         if(buffer[0][i]!= buffer[1][i]) printf("fsck: %6d %12d %7d\n",i, buffer[0][i], buffer[1][i]);

  1918. 

  1919.     printf("testing 9/7 DWT\n");

  1920.     s.spatial_decomposition_type=0;

  1921.     for(i=0; i<width*height; i++)

  1922.         buffer[0][i] = buffer[1][i] = av_lfg_get(&prng) % 54321 - 12345;

  1923. 

  1924.     ff_spatial_dwt(buffer[0], s.temp_dwt_buffer, width, height, width, s.spatial_decomposition_type, s.spatial_decomposition_count);

  1925.     ff_spatial_idwt((IDWTELEM*)buffer[0], s.temp_idwt_buffer, width, height, width, s.spatial_decomposition_type, s.spatial_decomposition_count);

  1926. 

  1927.     for(i=0; i<width*height; i++)

  1928.         if(FFABS(buffer[0][i] - buffer[1][i])>20) printf("fsck: %6d %12d %7d\n",i, buffer[0][i], buffer[1][i]);

  1929. 

  1930.     {

  1931.     int level, orientation, x, y;

  1932.     int64_t errors[8][4];

  1933.     int64_t g=0;

  1934. 

  1935.         memset(errors, 0, sizeof(errors));

  1936.         s.spatial_decomposition_count=3;

  1937.         s.spatial_decomposition_type=0;

  1938.         for(level=0; level<s.spatial_decomposition_count; level++){

  1939.             for(orientation=level ? 1 : 0; orientation<4; orientation++){

  1940.                 int w= width  >> (s.spatial_decomposition_count-level);

  1941.                 int h= height >> (s.spatial_decomposition_count-level);

  1942.                 int stride= width  << (s.spatial_decomposition_count-level);

  1943.                 DWTELEM *buf= buffer[0];

  1944.                 int64_t error=0;

  1945. 

  1946.                 if(orientation&1) buf+=w;

  1947.                 if(orientation>1) buf+=stride>>1;

  1948. 

  1949.                 memset(buffer[0], 0, sizeof(int)*width*height);

  1950.                 buf[w/2 + h/2*stride]= 256*256;

  1951.                 ff_spatial_idwt((IDWTELEM*)buffer[0], s.temp_idwt_buffer, width, height, width, s.spatial_decomposition_type, s.spatial_decomposition_count);

  1952.                 for(y=0; y<height; y++){

  1953.                     for(x=0; x<width; x++){

  1954.                         int64_t d= buffer[0][x + y*width];

  1955.                         error += d*d;

  1956.                         if(FFABS(width/2-x)<9 && FFABS(height/2-y)<9 && level==2) printf("%8"PRId64" ", d);

  1957.                     }

  1958.                     if(FFABS(height/2-y)<9 && level==2) printf("\n");

  1959.                 }

  1960.                 error= (int)(sqrt(error)+0.5);

  1961.                 errors[level][orientation]= error;

  1962.                 if(g) g=av_gcd(g, error);

  1963.                 else g= error;

  1964.             }

  1965.         }

  1966.         printf("static int const visual_weight[][4]={\n");

  1967.         for(level=0; level<s.spatial_decomposition_count; level++){

  1968.             printf("  {");

  1969.             for(orientation=0; orientation<4; orientation++){

  1970.                 printf("%8"PRId64",", errors[level][orientation]/g);

  1971.             }

  1972.             printf("},\n");

  1973.         }

  1974.         printf("};\n");

  1975.         {

  1976.             int level=2;

  1977.             int w= width  >> (s.spatial_decomposition_count-level);

  1978.             //int h= height >> (s.spatial_decomposition_count-level);

  1979.             int stride= width  << (s.spatial_decomposition_count-level);

  1980.             DWTELEM *buf= buffer[0];

  1981.             int64_t error=0;

  1982. 

  1983.             buf+=w;

  1984.             buf+=stride>>1;

  1985. 

  1986.             memset(buffer[0], 0, sizeof(int)*width*height);

  1987.             for(y=0; y<height; y++){

  1988.                 for(x=0; x<width; x++){

  1989.                     int tab[4]={0,2,3,1};

  1990.                     buffer[0][x+width*y]= 256*256*tab[(x&1) + 2*(y&1)];

  1991.                 }

  1992.             }

  1993.             ff_spatial_dwt(buffer[0], s.temp_dwt_buffer, width, height, width, s.spatial_decomposition_type, s.spatial_decomposition_count);

  1994.             for(y=0; y<height; y++){

  1995.                 for(x=0; x<width; x++){

  1996.                     int64_t d= buffer[0][x + y*width];

  1997.                     error += d*d;

  1998.                     if(FFABS(width/2-x)<9 && FFABS(height/2-y)<9) printf("%8"PRId64" ", d);

  1999.                 }

  2000.                 if(FFABS(height/2-y)<9) printf("\n");

  2001.             }

  2002.         }

  2003. 

  2004.     }

  2005.     return 0;

  2006. }

  2007. #endif /* TEST */