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FFmpeg/libavcodec/snow.c

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  1. /*

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

  3.  *

  4.  * This file is part of Libav.

  5.  *

  6.  * Libav is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * Libav is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with Libav; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. #include "libavutil/intmath.h"

  22. #include "libavutil/log.h"

  23. #include "libavutil/opt.h"

  24. #include "avcodec.h"

  25. #include "dsputil.h"

  26. #include "dwt.h"

  27. #include "snow.h"

  28. #include "snowdata.h"

  29. 

  30. #include "rangecoder.h"

  31. #include "mathops.h"

  32. #include "h263.h"

  33. 

  34. #undef NDEBUG

  35. #include <assert.h>

  36. 

  37. 

  38. void ff_snow_inner_add_yblock(const uint8_t *obmc, const int obmc_stride, uint8_t * * block, int b_w, int b_h,

  39.                               int src_x, int src_y, int src_stride, slice_buffer * sb, int add, uint8_t * dst8){

  40.     int y, x;

  41.     IDWTELEM * dst;

  42.     for(y=0; y<b_h; y++){

  43.         //FIXME ugly misuse of obmc_stride

  44.         const uint8_t *obmc1= obmc + y*obmc_stride;

  45.         const uint8_t *obmc2= obmc1+ (obmc_stride>>1);

  46.         const uint8_t *obmc3= obmc1+ obmc_stride*(obmc_stride>>1);

  47.         const uint8_t *obmc4= obmc3+ (obmc_stride>>1);

  48.         dst = slice_buffer_get_line(sb, src_y + y);

  49.         for(x=0; x<b_w; x++){

  50.             int v=   obmc1[x] * block[3][x + y*src_stride]

  51.                     +obmc2[x] * block[2][x + y*src_stride]

  52.                     +obmc3[x] * block[1][x + y*src_stride]

  53.                     +obmc4[x] * block[0][x + y*src_stride];

  54. 

  55.             v <<= 8 - LOG2_OBMC_MAX;

  56.             if(FRAC_BITS != 8){

  57.                 v >>= 8 - FRAC_BITS;

  58.             }

  59.             if(add){

  60.                 v += dst[x + src_x];

  61.                 v = (v + (1<<(FRAC_BITS-1))) >> FRAC_BITS;

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

  63.                 dst8[x + y*src_stride] = v;

  64.             }else{

  65.                 dst[x + src_x] -= v;

  66.             }

  67.         }

  68.     }

  69. }

  70. 

  71. void ff_snow_reset_contexts(SnowContext *s){ //FIXME better initial contexts

  72.     int plane_index, level, orientation;

  73. 

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

  75.         for(level=0; level<MAX_DECOMPOSITIONS; level++){

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

  77.                 memset(s->plane[plane_index].band[level][orientation].state, MID_STATE, sizeof(s->plane[plane_index].band[level][orientation].state));

  78.             }

  79.         }

  80.     }

  81.     memset(s->header_state, MID_STATE, sizeof(s->header_state));

  82.     memset(s->block_state, MID_STATE, sizeof(s->block_state));

  83. }

  84. 

  85. int ff_snow_alloc_blocks(SnowContext *s){

  86.     int w= -((-s->avctx->width )>>LOG2_MB_SIZE);

  87.     int h= -((-s->avctx->height)>>LOG2_MB_SIZE);

  88. 

  89.     s->b_width = w;

  90.     s->b_height= h;

  91. 

  92.     av_free(s->block);

  93.     s->block= av_mallocz(w * h * sizeof(BlockNode) << (s->block_max_depth*2));

  94.     return 0;

  95. }

  96. 

  97. static void init_qexp(void){

  98.     int i;

  99.     double v=128;

  100. 

  101.     for(i=0; i<QROOT; i++){

  102.         ff_qexp[i]= lrintf(v);

  103.         v *= pow(2, 1.0 / QROOT);

  104.     }

  105. }

  106. static void mc_block(Plane *p, uint8_t *dst, const uint8_t *src, int stride, int b_w, int b_h, int dx, int dy){

  107.     static const uint8_t weight[64]={

  108.     8,7,6,5,4,3,2,1,

  109.     7,7,0,0,0,0,0,1,

  110.     6,0,6,0,0,0,2,0,

  111.     5,0,0,5,0,3,0,0,

  112.     4,0,0,0,4,0,0,0,

  113.     3,0,0,5,0,3,0,0,

  114.     2,0,6,0,0,0,2,0,

  115.     1,7,0,0,0,0,0,1,

  116.     };

  117. 

  118.     static const uint8_t brane[256]={

  119.     0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x11,0x12,0x12,0x12,0x12,0x12,0x12,0x12,

  120.     0x04,0x05,0xcc,0xcc,0xcc,0xcc,0xcc,0x41,0x15,0x16,0xcc,0xcc,0xcc,0xcc,0xcc,0x52,

  121.     0x04,0xcc,0x05,0xcc,0xcc,0xcc,0x41,0xcc,0x15,0xcc,0x16,0xcc,0xcc,0xcc,0x52,0xcc,

  122.     0x04,0xcc,0xcc,0x05,0xcc,0x41,0xcc,0xcc,0x15,0xcc,0xcc,0x16,0xcc,0x52,0xcc,0xcc,

  123.     0x04,0xcc,0xcc,0xcc,0x41,0xcc,0xcc,0xcc,0x15,0xcc,0xcc,0xcc,0x16,0xcc,0xcc,0xcc,

  124.     0x04,0xcc,0xcc,0x41,0xcc,0x05,0xcc,0xcc,0x15,0xcc,0xcc,0x52,0xcc,0x16,0xcc,0xcc,

  125.     0x04,0xcc,0x41,0xcc,0xcc,0xcc,0x05,0xcc,0x15,0xcc,0x52,0xcc,0xcc,0xcc,0x16,0xcc,

  126.     0x04,0x41,0xcc,0xcc,0xcc,0xcc,0xcc,0x05,0x15,0x52,0xcc,0xcc,0xcc,0xcc,0xcc,0x16,

  127.     0x44,0x45,0x45,0x45,0x45,0x45,0x45,0x45,0x55,0x56,0x56,0x56,0x56,0x56,0x56,0x56,

  128.     0x48,0x49,0xcc,0xcc,0xcc,0xcc,0xcc,0x85,0x59,0x5A,0xcc,0xcc,0xcc,0xcc,0xcc,0x96,

  129.     0x48,0xcc,0x49,0xcc,0xcc,0xcc,0x85,0xcc,0x59,0xcc,0x5A,0xcc,0xcc,0xcc,0x96,0xcc,

  130.     0x48,0xcc,0xcc,0x49,0xcc,0x85,0xcc,0xcc,0x59,0xcc,0xcc,0x5A,0xcc,0x96,0xcc,0xcc,

  131.     0x48,0xcc,0xcc,0xcc,0x49,0xcc,0xcc,0xcc,0x59,0xcc,0xcc,0xcc,0x96,0xcc,0xcc,0xcc,

  132.     0x48,0xcc,0xcc,0x85,0xcc,0x49,0xcc,0xcc,0x59,0xcc,0xcc,0x96,0xcc,0x5A,0xcc,0xcc,

  133.     0x48,0xcc,0x85,0xcc,0xcc,0xcc,0x49,0xcc,0x59,0xcc,0x96,0xcc,0xcc,0xcc,0x5A,0xcc,

  134.     0x48,0x85,0xcc,0xcc,0xcc,0xcc,0xcc,0x49,0x59,0x96,0xcc,0xcc,0xcc,0xcc,0xcc,0x5A,

  135.     };

  136. 

  137.     static const uint8_t needs[16]={

  138.     0,1,0,0,

  139.     2,4,2,0,

  140.     0,1,0,0,

  141.     15

  142.     };

  143. 

  144.     int x, y, b, r, l;

  145.     int16_t tmpIt   [64*(32+HTAPS_MAX)];

  146.     uint8_t tmp2t[3][stride*(32+HTAPS_MAX)];

  147.     int16_t *tmpI= tmpIt;

  148.     uint8_t *tmp2= tmp2t[0];

  149.     const uint8_t *hpel[11];

  150.     assert(dx<16 && dy<16);

  151.     r= brane[dx + 16*dy]&15;

  152.     l= brane[dx + 16*dy]>>4;

  153. 

  154.     b= needs[l] | needs[r];

  155.     if(p && !p->diag_mc)

  156.         b= 15;

  157. 

  158.     if(b&5){

  159.         for(y=0; y < b_h+HTAPS_MAX-1; y++){

  160.             for(x=0; x < b_w; x++){

  161.                 int a_1=src[x + HTAPS_MAX/2-4];

  162.                 int a0= src[x + HTAPS_MAX/2-3];

  163.                 int a1= src[x + HTAPS_MAX/2-2];

  164.                 int a2= src[x + HTAPS_MAX/2-1];

  165.                 int a3= src[x + HTAPS_MAX/2+0];

  166.                 int a4= src[x + HTAPS_MAX/2+1];

  167.                 int a5= src[x + HTAPS_MAX/2+2];

  168.                 int a6= src[x + HTAPS_MAX/2+3];

  169.                 int am=0;

  170.                 if(!p || p->fast_mc){

  171.                     am= 20*(a2+a3) - 5*(a1+a4) + (a0+a5);

  172.                     tmpI[x]= am;

  173.                     am= (am+16)>>5;

  174.                 }else{

  175.                     am= p->hcoeff[0]*(a2+a3) + p->hcoeff[1]*(a1+a4) + p->hcoeff[2]*(a0+a5) + p->hcoeff[3]*(a_1+a6);

  176.                     tmpI[x]= am;

  177.                     am= (am+32)>>6;

  178.                 }

  179. 

  180.                 if(am&(~255)) am= ~(am>>31);

  181.                 tmp2[x]= am;

  182.             }

  183.             tmpI+= 64;

  184.             tmp2+= stride;

  185.             src += stride;

  186.         }

  187.         src -= stride*y;

  188.     }

  189.     src += HTAPS_MAX/2 - 1;

  190.     tmp2= tmp2t[1];

  191. 

  192.     if(b&2){

  193.         for(y=0; y < b_h; y++){

  194.             for(x=0; x < b_w+1; x++){

  195.                 int a_1=src[x + (HTAPS_MAX/2-4)*stride];

  196.                 int a0= src[x + (HTAPS_MAX/2-3)*stride];

  197.                 int a1= src[x + (HTAPS_MAX/2-2)*stride];

  198.                 int a2= src[x + (HTAPS_MAX/2-1)*stride];

  199.                 int a3= src[x + (HTAPS_MAX/2+0)*stride];

  200.                 int a4= src[x + (HTAPS_MAX/2+1)*stride];

  201.                 int a5= src[x + (HTAPS_MAX/2+2)*stride];

  202.                 int a6= src[x + (HTAPS_MAX/2+3)*stride];

  203.                 int am=0;

  204.                 if(!p || p->fast_mc)

  205.                     am= (20*(a2+a3) - 5*(a1+a4) + (a0+a5) + 16)>>5;

  206.                 else

  207.                     am= (p->hcoeff[0]*(a2+a3) + p->hcoeff[1]*(a1+a4) + p->hcoeff[2]*(a0+a5) + p->hcoeff[3]*(a_1+a6) + 32)>>6;

  208. 

  209.                 if(am&(~255)) am= ~(am>>31);

  210.                 tmp2[x]= am;

  211.             }

  212.             src += stride;

  213.             tmp2+= stride;

  214.         }

  215.         src -= stride*y;

  216.     }

  217.     src += stride*(HTAPS_MAX/2 - 1);

  218.     tmp2= tmp2t[2];

  219.     tmpI= tmpIt;

  220.     if(b&4){

  221.         for(y=0; y < b_h; y++){

  222.             for(x=0; x < b_w; x++){

  223.                 int a_1=tmpI[x + (HTAPS_MAX/2-4)*64];

  224.                 int a0= tmpI[x + (HTAPS_MAX/2-3)*64];

  225.                 int a1= tmpI[x + (HTAPS_MAX/2-2)*64];

  226.                 int a2= tmpI[x + (HTAPS_MAX/2-1)*64];

  227.                 int a3= tmpI[x + (HTAPS_MAX/2+0)*64];

  228.                 int a4= tmpI[x + (HTAPS_MAX/2+1)*64];

  229.                 int a5= tmpI[x + (HTAPS_MAX/2+2)*64];

  230.                 int a6= tmpI[x + (HTAPS_MAX/2+3)*64];

  231.                 int am=0;

  232.                 if(!p || p->fast_mc)

  233.                     am= (20*(a2+a3) - 5*(a1+a4) + (a0+a5) + 512)>>10;

  234.                 else

  235.                     am= (p->hcoeff[0]*(a2+a3) + p->hcoeff[1]*(a1+a4) + p->hcoeff[2]*(a0+a5) + p->hcoeff[3]*(a_1+a6) + 2048)>>12;

  236.                 if(am&(~255)) am= ~(am>>31);

  237.                 tmp2[x]= am;

  238.             }

  239.             tmpI+= 64;

  240.             tmp2+= stride;

  241.         }

  242.     }

  243. 

  244.     hpel[ 0]= src;

  245.     hpel[ 1]= tmp2t[0] + stride*(HTAPS_MAX/2-1);

  246.     hpel[ 2]= src + 1;

  247. 

  248.     hpel[ 4]= tmp2t[1];

  249.     hpel[ 5]= tmp2t[2];

  250.     hpel[ 6]= tmp2t[1] + 1;

  251. 

  252.     hpel[ 8]= src + stride;

  253.     hpel[ 9]= hpel[1] + stride;

  254.     hpel[10]= hpel[8] + 1;

  255. 

  256.     if(b==15){

  257.         const uint8_t *src1= hpel[dx/8 + dy/8*4  ];

  258.         const uint8_t *src2= hpel[dx/8 + dy/8*4+1];

  259.         const uint8_t *src3= hpel[dx/8 + dy/8*4+4];

  260.         const uint8_t *src4= hpel[dx/8 + dy/8*4+5];

  261.         dx&=7;

  262.         dy&=7;

  263.         for(y=0; y < b_h; y++){

  264.             for(x=0; x < b_w; x++){

  265.                 dst[x]= ((8-dx)*(8-dy)*src1[x] + dx*(8-dy)*src2[x]+

  266.                          (8-dx)*   dy *src3[x] + dx*   dy *src4[x]+32)>>6;

  267.             }

  268.             src1+=stride;

  269.             src2+=stride;

  270.             src3+=stride;

  271.             src4+=stride;

  272.             dst +=stride;

  273.         }

  274.     }else{

  275.         const uint8_t *src1= hpel[l];

  276.         const uint8_t *src2= hpel[r];

  277.         int a= weight[((dx&7) + (8*(dy&7)))];

  278.         int b= 8-a;

  279.         for(y=0; y < b_h; y++){

  280.             for(x=0; x < b_w; x++){

  281.                 dst[x]= (a*src1[x] + b*src2[x] + 4)>>3;

  282.             }

  283.             src1+=stride;

  284.             src2+=stride;

  285.             dst +=stride;

  286.         }

  287.     }

  288. }

  289. 

  290. void ff_snow_pred_block(SnowContext *s, uint8_t *dst, uint8_t *tmp, int stride, int sx, int sy, int b_w, int b_h, BlockNode *block, int plane_index, int w, int h){

  291.     if(block->type & BLOCK_INTRA){

  292.         int x, y;

  293.         const unsigned color  = block->color[plane_index];

  294.         const unsigned color4 = color*0x01010101;

  295.         if(b_w==32){

  296.             for(y=0; y < b_h; y++){

  297.                 *(uint32_t*)&dst[0 + y*stride]= color4;

  298.                 *(uint32_t*)&dst[4 + y*stride]= color4;

  299.                 *(uint32_t*)&dst[8 + y*stride]= color4;

  300.                 *(uint32_t*)&dst[12+ y*stride]= color4;

  301.                 *(uint32_t*)&dst[16+ y*stride]= color4;

  302.                 *(uint32_t*)&dst[20+ y*stride]= color4;

  303.                 *(uint32_t*)&dst[24+ y*stride]= color4;

  304.                 *(uint32_t*)&dst[28+ y*stride]= color4;

  305.             }

  306.         }else if(b_w==16){

  307.             for(y=0; y < b_h; y++){

  308.                 *(uint32_t*)&dst[0 + y*stride]= color4;

  309.                 *(uint32_t*)&dst[4 + y*stride]= color4;

  310.                 *(uint32_t*)&dst[8 + y*stride]= color4;

  311.                 *(uint32_t*)&dst[12+ y*stride]= color4;

  312.             }

  313.         }else if(b_w==8){

  314.             for(y=0; y < b_h; y++){

  315.                 *(uint32_t*)&dst[0 + y*stride]= color4;

  316.                 *(uint32_t*)&dst[4 + y*stride]= color4;

  317.             }

  318.         }else if(b_w==4){

  319.             for(y=0; y < b_h; y++){

  320.                 *(uint32_t*)&dst[0 + y*stride]= color4;

  321.             }

  322.         }else{

  323.             for(y=0; y < b_h; y++){

  324.                 for(x=0; x < b_w; x++){

  325.                     dst[x + y*stride]= color;

  326.                 }

  327.             }

  328.         }

  329.     }else{

  330.         uint8_t *src= s->last_picture[block->ref].data[plane_index];

  331.         const int scale= plane_index ?  s->mv_scale : 2*s->mv_scale;

  332.         int mx= block->mx*scale;

  333.         int my= block->my*scale;

  334.         const int dx= mx&15;

  335.         const int dy= my&15;

  336.         const int tab_index= 3 - (b_w>>2) + (b_w>>4);

  337.         sx += (mx>>4) - (HTAPS_MAX/2-1);

  338.         sy += (my>>4) - (HTAPS_MAX/2-1);

  339.         src += sx + sy*stride;

  340.         if(   (unsigned)sx >= w - b_w - (HTAPS_MAX-2)

  341.            || (unsigned)sy >= h - b_h - (HTAPS_MAX-2)){

  342.             s->dsp.emulated_edge_mc(tmp + MB_SIZE, src, stride, b_w+HTAPS_MAX-1, b_h+HTAPS_MAX-1, sx, sy, w, h);

  343.             src= tmp + MB_SIZE;

  344.         }

  345. //        assert(b_w == b_h || 2*b_w == b_h || b_w == 2*b_h);

  346. //        assert(!(b_w&(b_w-1)));

  347.         assert(b_w>1 && b_h>1);

  348.         assert((tab_index>=0 && tab_index<4) || b_w==32);

  349.         if((dx&3) || (dy&3) || !(b_w == b_h || 2*b_w == b_h || b_w == 2*b_h) || (b_w&(b_w-1)) || !s->plane[plane_index].fast_mc )

  350.             mc_block(&s->plane[plane_index], dst, src, stride, b_w, b_h, dx, dy);

  351.         else if(b_w==32){

  352.             int y;

  353.             for(y=0; y<b_h; y+=16){

  354.                 s->dsp.put_h264_qpel_pixels_tab[0][dy+(dx>>2)](dst + y*stride, src + 3 + (y+3)*stride,stride);

  355.                 s->dsp.put_h264_qpel_pixels_tab[0][dy+(dx>>2)](dst + 16 + y*stride, src + 19 + (y+3)*stride,stride);

  356.             }

  357.         }else if(b_w==b_h)

  358.             s->dsp.put_h264_qpel_pixels_tab[tab_index  ][dy+(dx>>2)](dst,src + 3 + 3*stride,stride);

  359.         else if(b_w==2*b_h){

  360.             s->dsp.put_h264_qpel_pixels_tab[tab_index+1][dy+(dx>>2)](dst    ,src + 3       + 3*stride,stride);

  361.             s->dsp.put_h264_qpel_pixels_tab[tab_index+1][dy+(dx>>2)](dst+b_h,src + 3 + b_h + 3*stride,stride);

  362.         }else{

  363.             assert(2*b_w==b_h);

  364.             s->dsp.put_h264_qpel_pixels_tab[tab_index  ][dy+(dx>>2)](dst           ,src + 3 + 3*stride           ,stride);

  365.             s->dsp.put_h264_qpel_pixels_tab[tab_index  ][dy+(dx>>2)](dst+b_w*stride,src + 3 + 3*stride+b_w*stride,stride);

  366.         }

  367.     }

  368. }

  369. 

  370. #define mca(dx,dy,b_w)\

  371. static void mc_block_hpel ## dx ## dy ## b_w(uint8_t *dst, const uint8_t *src, int stride, int h){\

  372.     assert(h==b_w);\

  373.     mc_block(NULL, dst, src-(HTAPS_MAX/2-1)-(HTAPS_MAX/2-1)*stride, stride, b_w, b_w, dx, dy);\

  374. }

  375. 

  376. mca( 0, 0,16)

  377. mca( 8, 0,16)

  378. mca( 0, 8,16)

  379. mca( 8, 8,16)

  380. mca( 0, 0,8)

  381. mca( 8, 0,8)

  382. mca( 0, 8,8)

  383. mca( 8, 8,8)

  384. 

  385. av_cold int ff_snow_common_init(AVCodecContext *avctx){

  386.     SnowContext *s = avctx->priv_data;

  387.     int width, height;

  388.     int i, j;

  389. 

  390.     s->avctx= avctx;

  391.     s->max_ref_frames=1; //just make sure its not an invalid value in case of no initial keyframe

  392. 

  393.     ff_dsputil_init(&s->dsp, avctx);

  394.     ff_dwt_init(&s->dwt);

  395. 

  396. #define mcf(dx,dy)\

  397.     s->dsp.put_qpel_pixels_tab       [0][dy+dx/4]=\

  398.     s->dsp.put_no_rnd_qpel_pixels_tab[0][dy+dx/4]=\

  399.         s->dsp.put_h264_qpel_pixels_tab[0][dy+dx/4];\

  400.     s->dsp.put_qpel_pixels_tab       [1][dy+dx/4]=\

  401.     s->dsp.put_no_rnd_qpel_pixels_tab[1][dy+dx/4]=\

  402.         s->dsp.put_h264_qpel_pixels_tab[1][dy+dx/4];

  403. 

  404.     mcf( 0, 0)

  405.     mcf( 4, 0)

  406.     mcf( 8, 0)

  407.     mcf(12, 0)

  408.     mcf( 0, 4)

  409.     mcf( 4, 4)

  410.     mcf( 8, 4)

  411.     mcf(12, 4)

  412.     mcf( 0, 8)

  413.     mcf( 4, 8)

  414.     mcf( 8, 8)

  415.     mcf(12, 8)

  416.     mcf( 0,12)

  417.     mcf( 4,12)

  418.     mcf( 8,12)

  419.     mcf(12,12)

  420. 

  421. #define mcfh(dx,dy)\

  422.     s->dsp.put_pixels_tab       [0][dy/4+dx/8]=\

  423.     s->dsp.put_no_rnd_pixels_tab[0][dy/4+dx/8]=\

  424.         mc_block_hpel ## dx ## dy ## 16;\

  425.     s->dsp.put_pixels_tab       [1][dy/4+dx/8]=\

  426.     s->dsp.put_no_rnd_pixels_tab[1][dy/4+dx/8]=\

  427.         mc_block_hpel ## dx ## dy ## 8;

  428. 

  429.     mcfh(0, 0)

  430.     mcfh(8, 0)

  431.     mcfh(0, 8)

  432.     mcfh(8, 8)

  433. 

  434.     init_qexp();

  435. 

  436. //    dec += FFMAX(s->chroma_h_shift, s->chroma_v_shift);

  437. 

  438.     width= s->avctx->width;

  439.     height= s->avctx->height;

  440. 

  441.     s->spatial_idwt_buffer= av_mallocz(width*height*sizeof(IDWTELEM));

  442.     s->spatial_dwt_buffer= av_mallocz(width*height*sizeof(DWTELEM)); //FIXME this does not belong here

  443.     s->temp_dwt_buffer = av_mallocz(width * sizeof(DWTELEM));

  444.     s->temp_idwt_buffer = av_mallocz(width * sizeof(IDWTELEM));

  445. 

  446.     for(i=0; i<MAX_REF_FRAMES; i++)

  447.         for(j=0; j<MAX_REF_FRAMES; j++)

  448.             ff_scale_mv_ref[i][j] = 256*(i+1)/(j+1);

  449. 

  450.     s->avctx->get_buffer(s->avctx, &s->mconly_picture);

  451.     s->scratchbuf = av_malloc(s->mconly_picture.linesize[0]*7*MB_SIZE);

  452. 

  453.     return 0;

  454. }

  455. 

  456. int ff_snow_common_init_after_header(AVCodecContext *avctx) {

  457.     SnowContext *s = avctx->priv_data;

  458.     int plane_index, level, orientation;

  459. 

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

  461.         int w= s->avctx->width;

  462.         int h= s->avctx->height;

  463. 

  464.         if(plane_index){

  465.             w>>= s->chroma_h_shift;

  466.             h>>= s->chroma_v_shift;

  467.         }

  468.         s->plane[plane_index].width = w;

  469.         s->plane[plane_index].height= h;

  470. 

  471.         for(level=s->spatial_decomposition_count-1; level>=0; level--){

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

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

  474. 

  475.                 b->buf= s->spatial_dwt_buffer;

  476.                 b->level= level;

  477.                 b->stride= s->plane[plane_index].width << (s->spatial_decomposition_count - level);

  478.                 b->width = (w + !(orientation&1))>>1;

  479.                 b->height= (h + !(orientation>1))>>1;

  480. 

  481.                 b->stride_line = 1 << (s->spatial_decomposition_count - level);

  482.                 b->buf_x_offset = 0;

  483.                 b->buf_y_offset = 0;

  484. 

  485.                 if(orientation&1){

  486.                     b->buf += (w+1)>>1;

  487.                     b->buf_x_offset = (w+1)>>1;

  488.                 }

  489.                 if(orientation>1){

  490.                     b->buf += b->stride>>1;

  491.                     b->buf_y_offset = b->stride_line >> 1;

  492.                 }

  493.                 b->ibuf= s->spatial_idwt_buffer + (b->buf - s->spatial_dwt_buffer);

  494. 

  495.                 if(level)

  496.                     b->parent= &s->plane[plane_index].band[level-1][orientation];

  497.                 //FIXME avoid this realloc

  498.                 av_freep(&b->x_coeff);

  499.                 b->x_coeff=av_mallocz(((b->width+1) * b->height+1)*sizeof(x_and_coeff));

  500.             }

  501.             w= (w+1)>>1;

  502.             h= (h+1)>>1;

  503.         }

  504.     }

  505. 

  506.     return 0;

  507. }

  508. 

  509. #define USE_HALFPEL_PLANE 0

  510. 

  511. static void halfpel_interpol(SnowContext *s, uint8_t *halfpel[4][4], AVFrame *frame){

  512.     int p,x,y;

  513. 

  514.     for(p=0; p<3; p++){

  515.         int is_chroma= !!p;

  516.         int w= s->avctx->width  >>is_chroma;

  517.         int h= s->avctx->height >>is_chroma;

  518.         int ls= frame->linesize[p];

  519.         uint8_t *src= frame->data[p];

  520. 

  521.         halfpel[1][p] = (uint8_t*) av_malloc(ls * (h + 2 * EDGE_WIDTH)) + EDGE_WIDTH * (1 + ls);

  522.         halfpel[2][p] = (uint8_t*) av_malloc(ls * (h + 2 * EDGE_WIDTH)) + EDGE_WIDTH * (1 + ls);

  523.         halfpel[3][p] = (uint8_t*) av_malloc(ls * (h + 2 * EDGE_WIDTH)) + EDGE_WIDTH * (1 + ls);

  524. 

  525.         halfpel[0][p]= src;

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

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

  528.                 int i= y*ls + x;

  529. 

  530.                 halfpel[1][p][i]= (20*(src[i] + src[i+1]) - 5*(src[i-1] + src[i+2]) + (src[i-2] + src[i+3]) + 16 )>>5;

  531.             }

  532.         }

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

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

  535.                 int i= y*ls + x;

  536. 

  537.                 halfpel[2][p][i]= (20*(src[i] + src[i+ls]) - 5*(src[i-ls] + src[i+2*ls]) + (src[i-2*ls] + src[i+3*ls]) + 16 )>>5;

  538.             }

  539.         }

  540.         src= halfpel[1][p];

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

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

  543.                 int i= y*ls + x;

  544. 

  545.                 halfpel[3][p][i]= (20*(src[i] + src[i+ls]) - 5*(src[i-ls] + src[i+2*ls]) + (src[i-2*ls] + src[i+3*ls]) + 16 )>>5;

  546.             }

  547.         }

  548. 

  549. //FIXME border!

  550.     }

  551. }

  552. 

  553. void ff_snow_release_buffer(AVCodecContext *avctx)

  554. {

  555.     SnowContext *s = avctx->priv_data;

  556.     int i;

  557. 

  558.     if(s->last_picture[s->max_ref_frames-1].data[0]){

  559.         avctx->release_buffer(avctx, &s->last_picture[s->max_ref_frames-1]);

  560.         for(i=0; i<9; i++)

  561.             if(s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3])

  562.                 av_free(s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3] - EDGE_WIDTH*(1+s->current_picture.linesize[i%3]));

  563.     }

  564. }

  565. 

  566. int ff_snow_frame_start(SnowContext *s){

  567.    AVFrame tmp;

  568.    int w= s->avctx->width; //FIXME round up to x16 ?

  569.    int h= s->avctx->height;

  570. 

  571.     if (s->current_picture.data[0] && !(s->avctx->flags&CODEC_FLAG_EMU_EDGE)) {

  572.         s->dsp.draw_edges(s->current_picture.data[0],

  573.                           s->current_picture.linesize[0], w   , h   ,

  574.                           EDGE_WIDTH  , EDGE_WIDTH  , EDGE_TOP | EDGE_BOTTOM);

  575.         s->dsp.draw_edges(s->current_picture.data[1],

  576.                           s->current_picture.linesize[1], w>>1, h>>1,

  577.                           EDGE_WIDTH/2, EDGE_WIDTH/2, EDGE_TOP | EDGE_BOTTOM);

  578.         s->dsp.draw_edges(s->current_picture.data[2],

  579.                           s->current_picture.linesize[2], w>>1, h>>1,

  580.                           EDGE_WIDTH/2, EDGE_WIDTH/2, EDGE_TOP | EDGE_BOTTOM);

  581.     }

  582. 

  583.     ff_snow_release_buffer(s->avctx);

  584. 

  585.     tmp= s->last_picture[s->max_ref_frames-1];

  586.     memmove(s->last_picture+1, s->last_picture, (s->max_ref_frames-1)*sizeof(AVFrame));

  587.     memmove(s->halfpel_plane+1, s->halfpel_plane, (s->max_ref_frames-1)*sizeof(void*)*4*4);

  588.     if(USE_HALFPEL_PLANE && s->current_picture.data[0])

  589.         halfpel_interpol(s, s->halfpel_plane[0], &s->current_picture);

  590.     s->last_picture[0]= s->current_picture;

  591.     s->current_picture= tmp;

  592. 

  593.     if(s->keyframe){

  594.         s->ref_frames= 0;

  595.     }else{

  596.         int i;

  597.         for(i=0; i<s->max_ref_frames && s->last_picture[i].data[0]; i++)

  598.             if(i && s->last_picture[i-1].key_frame)

  599.                 break;

  600.         s->ref_frames= i;

  601.         if(s->ref_frames==0){

  602.             av_log(s->avctx,AV_LOG_ERROR, "No reference frames\n");

  603.             return -1;

  604.         }

  605.     }

  606. 

  607.     s->current_picture.reference= 1;

  608.     if(s->avctx->get_buffer(s->avctx, &s->current_picture) < 0){

  609.         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  610.         return -1;

  611.     }

  612. 

  613.     s->current_picture.key_frame= s->keyframe;

  614. 

  615.     return 0;

  616. }

  617. 

  618. av_cold void ff_snow_common_end(SnowContext *s)

  619. {

  620.     int plane_index, level, orientation, i;

  621. 

  622.     av_freep(&s->spatial_dwt_buffer);

  623.     av_freep(&s->temp_dwt_buffer);

  624.     av_freep(&s->spatial_idwt_buffer);

  625.     av_freep(&s->temp_idwt_buffer);

  626. 

  627.     s->m.me.temp= NULL;

  628.     av_freep(&s->m.me.scratchpad);

  629.     av_freep(&s->m.me.map);

  630.     av_freep(&s->m.me.score_map);

  631.     av_freep(&s->m.obmc_scratchpad);

  632. 

  633.     av_freep(&s->block);

  634.     av_freep(&s->scratchbuf);

  635. 

  636.     for(i=0; i<MAX_REF_FRAMES; i++){

  637.         av_freep(&s->ref_mvs[i]);

  638.         av_freep(&s->ref_scores[i]);

  639.         if(s->last_picture[i].data[0])

  640.             s->avctx->release_buffer(s->avctx, &s->last_picture[i]);

  641.     }

  642. 

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

  644.         for(level=s->spatial_decomposition_count-1; level>=0; level--){

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

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

  647. 

  648.                 av_freep(&b->x_coeff);

  649.             }

  650.         }

  651.     }

  652.     if (s->mconly_picture.data[0])

  653.         s->avctx->release_buffer(s->avctx, &s->mconly_picture);

  654.     if (s->current_picture.data[0])

  655.         s->avctx->release_buffer(s->avctx, &s->current_picture);

  656. }