mirror of
https://github.com/WinampDesktop/winamp.git
synced 2024-12-21 08:45:53 +01:00
871 lines
18 KiB
C++
871 lines
18 KiB
C++
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#include "Decoder.h"
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#define sign(a) ((a) < 0 ? -1 : 1)
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/* private prototypes*/
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static int motion_decode(int vec,int pmv);
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static void make_edge_image(const unsigned char *src, unsigned char *dst, int width, int height, int edge);
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/* decode one frame or field picture */
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void Decoder::getpicture(Frame decodedFrame)
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{
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int i;
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unsigned char *tmp;
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for (i=0; i<3; i++)
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{
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tmp = oldrefframe[i];
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oldrefframe[i] = refframe[i];
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refframe[i] = tmp;
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newframe[i] = refframe[i];
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}
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if (!firstFrame)
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{
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make_edge_image(oldrefframe[0],edgeframe[0],coded_picture_width,
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coded_picture_height,32);
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make_edge_image(oldrefframe[1],edgeframe[1],chrom_width, chrom_height,16);
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make_edge_image(oldrefframe[2],edgeframe[2],chrom_width, chrom_height,16);
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}
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//getMBs();
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get_I_P_MBs();
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if (deblock)
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edge_filter(newframe[0], newframe[1], newframe[2],
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coded_picture_width, coded_picture_height);
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/*
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PostFilter(newframe[0], newframe[1], newframe[2],
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coded_picture_width, coded_picture_height);
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*/
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decodedFrame[0] = newframe[0];
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decodedFrame[1] = newframe[1];
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decodedFrame[2] = newframe[2];
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firstFrame=false;
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}
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/* decode all macroblocks of the current picture */
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void Decoder::clearblock(int comp)
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{
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int *bp;
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int i;
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bp = (int *)block[comp];
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for (i=0; i<8; i++)
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{
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bp[0] = bp[1] = bp[2] = bp[3] = 0;
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bp += 4;
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}
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}
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/* move/add 8x8-Block from block[comp] to refframe or bframe */
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void Decoder::addblock(int comp, int bx, int by, int addflag)
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{
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int cc,i, iincr;
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unsigned char *rfp;
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short *bp;
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bp = block[comp];
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/* TODO: benski>
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ippiCopy8x8_8u_C1R (addflag = 0)
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ippiAdd8x8_16s8u_C1IRS (addflag = 1)
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*/
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cc = (comp<4) ? 0 : (comp&1)+1; /* color component index */
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if (cc==0)
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{
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/* luminance */
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/* frame DCT coding */
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rfp = newframe[0]
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+ coded_picture_width*(by+((comp&2)<<2)) + bx + ((comp&1)<<3);
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iincr = coded_picture_width;
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}
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else
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{
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/* chrominance */
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/* scale coordinates */
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bx >>= 1;
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by >>= 1;
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/* frame DCT coding */
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rfp = newframe[cc] + chrom_width*by + bx;
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iincr = chrom_width;
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}
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if (addflag)
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{
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for (i=0; i<8; i++)
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{
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rfp[0] = clp[bp[0]+rfp[0]];
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rfp[1] = clp[bp[1]+rfp[1]];
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rfp[2] = clp[bp[2]+rfp[2]];
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rfp[3] = clp[bp[3]+rfp[3]];
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rfp[4] = clp[bp[4]+rfp[4]];
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rfp[5] = clp[bp[5]+rfp[5]];
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rfp[6] = clp[bp[6]+rfp[6]];
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rfp[7] = clp[bp[7]+rfp[7]];
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bp += 8;
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rfp+= iincr;
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}
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}
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else
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{
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for (i=0; i<8; i++)
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{
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rfp[0] = clp[bp[0]];
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rfp[1] = clp[bp[1]];
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rfp[2] = clp[bp[2]];
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rfp[3] = clp[bp[3]];
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rfp[4] = clp[bp[4]];
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rfp[5] = clp[bp[5]];
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rfp[6] = clp[bp[6]];
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rfp[7] = clp[bp[7]];
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bp += 8;
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rfp += iincr;
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}
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}
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}
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int motion_decode(int vec, int pmv)
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{
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if (vec > 31) vec -= 64;
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vec += pmv;
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if (vec > 31)
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vec -= 64;
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if (vec < -32)
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vec += 64;
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return vec;
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}
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int Decoder::find_pmv(int x, int y, int block, int comp)
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{
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int p1,p2,p3;
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int xin1,xin2,xin3;
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int yin1,yin2,yin3;
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int vec1,vec2,vec3;
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int l8,o8,or8;
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x++;y++;
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l8 = (modemap[y][x-1] == MODE_INTER4V ? 1 : 0);
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o8 = (modemap[y-1][x] == MODE_INTER4V ? 1 : 0);
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or8 = (modemap[y-1][x+1] == MODE_INTER4V ? 1 : 0);
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switch (block)
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{
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case 0:
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vec1 = (l8 ? 2 : 0) ; yin1 = y ; xin1 = x-1;
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vec2 = (o8 ? 3 : 0) ; yin2 = y-1; xin2 = x;
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vec3 = (or8? 3 : 0) ; yin3 = y-1; xin3 = x+1;
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break;
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case 1:
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vec1 = (l8 ? 2 : 0) ; yin1 = y ; xin1 = x-1;
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vec2 = (o8 ? 3 : 0) ; yin2 = y-1; xin2 = x;
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vec3 = (or8? 3 : 0) ; yin3 = y-1; xin3 = x+1;
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break;
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case 2:
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vec1 = 1 ; yin1 = y ; xin1 = x;
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vec2 = (o8 ? 4 : 0) ; yin2 = y-1; xin2 = x;
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vec3 = (or8? 3 : 0) ; yin3 = y-1; xin3 = x+1;
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break;
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case 3:
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vec1 = (l8 ? 4 : 0) ; yin1 = y ; xin1 = x-1;
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vec2 = 1 ; yin2 = y ; xin2 = x;
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vec3 = 2 ; yin3 = y ; xin3 = x;
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break;
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case 4:
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vec1 = 3 ; yin1 = y ; xin1 = x;
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vec2 = 1 ; yin2 = y ; xin2 = x;
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vec3 = 2 ; yin3 = y ; xin3 = x;
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break;
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default:
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exit(1);
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break;
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}
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p1 = MV[comp][vec1][yin1][xin1];
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p2 = MV[comp][vec2][yin2][xin2];
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p3 = MV[comp][vec3][yin3][xin3];
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if (p2 == NO_VEC)
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{
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p2 = p3 = p1;
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}
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return p1+p2+p3 - max(p1,max(p2,p3)) - min(p1,min(p2,p3));
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}
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void make_edge_image(const unsigned char *src,unsigned char *dst,int width,int height,int edge)
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{
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int i,j;
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unsigned char *p1,*p2,*p3,*p4;
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const unsigned char *o1,*o2,*o3,*o4;
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/* center image */
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p1 = dst;
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o1 = src;
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for (j = 0; j < height;j++)
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{
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for (i = 0; i < width; i++)
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{
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*(p1 + i) = *(o1 + i);
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}
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p1 += width + (edge<<1);
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o1 += width;
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}
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/* left and right edges */
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p1 = dst-1;
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o1 = src;
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for (j = 0; j < height;j++)
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{
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for (i = 0; i < edge; i++)
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{
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*(p1 - i) = *o1;
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*(p1 + width + i + 1) = *(o1 + width - 1);
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}
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p1 += width + (edge<<1);
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o1 += width;
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}
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/* top and bottom edges */
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p1 = dst;
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p2 = dst + (width + (edge<<1))*(height-1);
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o1 = src;
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o2 = src + width*(height-1);
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for (j = 0; j < edge;j++)
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{
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p1 = p1 - (width + (edge<<1));
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p2 = p2 + (width + (edge<<1));
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for (i = 0; i < width; i++)
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{
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*(p1 + i) = *(o1 + i);
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*(p2 + i) = *(o2 + i);
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}
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}
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/* corners */
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p1 = dst - (width+(edge<<1)) - 1;
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p2 = p1 + width + 1;
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p3 = dst + (width+(edge<<1))*(height)-1;
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p4 = p3 + width + 1;
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o1 = src;
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o2 = o1 + width - 1;
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o3 = src + width*(height-1);
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o4 = o3 + width - 1;
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for (j = 0; j < edge; j++)
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{
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for (i = 0; i < edge; i++)
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{
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*(p1 - i) = *o1;
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*(p2 + i) = *o2;
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*(p3 - i) = *o3;
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*(p4 + i) = *o4;
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}
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p1 = p1 - (width + (edge<<1));
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p2 = p2 - (width + (edge<<1));
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p3 = p3 + width + (edge<<1);
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p4 = p4 + width + (edge<<1);
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}
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}
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static bool Mode_IsInter(int Mode)
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{
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return (Mode == MODE_INTER || Mode == MODE_INTER_Q ||
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Mode == MODE_INTER4V || Mode == MODE_INTER4V_Q);
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}
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static bool Mode_IsIntra(int Mode)
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{
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return (Mode == MODE_INTRA || Mode == MODE_INTRA_Q);
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}
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void Decoder::get_I_P_MBs()
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{
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int comp;
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int MBA, MBAmax;
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int COD = 0, MCBPC, CBPY, CBP = 0, CBPB = 0, MODB = 0, Mode = 0, DQUANT;
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int mvx = 0, mvy = 0, pmv0, pmv1, xpos, ypos, k;
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int startmv, stopmv, last_done = 0, pCBP = 0, pCBPB = 0, pCOD = 0, pMODB = 0;
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int DQ_tab[4] = {-1, -2, 1, 2};
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unsigned int i;
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short *bp;
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/* number of macroblocks per picture */
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MBAmax = mb_width * mb_height;
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MBA = 0; /* macroblock address */
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xpos = ypos = 0;
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/* mark MV's above the picture */
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for (i = 1; i < mb_width + 1; i++)
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{
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for (k = 0; k < 5; k++)
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{
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MV[0][k][0][i] = NO_VEC;
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MV[1][k][0][i] = NO_VEC;
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}
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modemap[0][i] = MODE_INTRA;
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}
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/* zero MV's on the sides of the picture */
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for (i = 0; i < mb_height + 1; i++)
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{
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for (k = 0; k < 5; k++)
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{
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MV[0][k][i][0] = 0;
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MV[1][k][i][0] = 0;
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MV[0][k][i][mb_width + 1] = 0;
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MV[1][k][i][mb_width + 1] = 0;
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}
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modemap[i][0] = MODE_INTRA;
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modemap[i][mb_width + 1] = MODE_INTRA;
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}
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/* initialize the qcoeff used in advanced intra coding */
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fault = 0;
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for (;;)
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{
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resync:
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/* This version of the decoder does not resync on every possible
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* error, and it does not do all possible error checks. It is not
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* difficult to make it much more error robust, but I do not think it
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* is necessary to include this in the freely available version. */
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if (fault)
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{
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startcode(); /* sync on new startcode */
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fault = 0;
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}
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xpos = MBA % mb_width;
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ypos = MBA / mb_width;
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if (MBA >= MBAmax)
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{
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/* all macroblocks decoded */
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return;
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}
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read_cod:
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if (PCT_INTER == pict_type || PCT_DISPOSABLE_INTER == pict_type)
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{
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COD = buffer.showbits(1);
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}
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else
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{
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COD = 0; /* Intra picture -> not skipped */
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coded_map[ypos + 1][xpos + 1] = 1;
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}
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if (!COD)
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{
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/* COD == 0 --> not skipped */
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if (PCT_INTER == pict_type || PCT_DISPOSABLE_INTER == pict_type)
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{
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/* flush COD bit */
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buffer.flushbits(1);
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}
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if (PCT_INTRA == pict_type)
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{
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MCBPC = getMCBPCintra();
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}
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else
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{
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MCBPC = getMCBPC();
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}
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if (fault)
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goto resync;
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if (MCBPC == 255)
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{
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/* stuffing - read next COD without advancing MB count. */
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goto read_cod;
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}
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else
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{
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/* normal MB data */
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Mode = MCBPC & 7;
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/* MODB and CBPB */
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CBPY = getCBPY();
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}
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/* Decode Mode and CBP */
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if ((Mode == MODE_INTRA || Mode == MODE_INTRA_Q))
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{
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/* Intra */
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coded_map[ypos + 1][xpos + 1] = 1;
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CBPY = CBPY ^ 15; /* needed in huffman coding only */
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}
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CBP = (CBPY << 2) | (MCBPC >> 4);
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if (Mode == MODE_INTER_Q || Mode == MODE_INTRA_Q || Mode == MODE_INTER4V_Q)
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{
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/* Read DQUANT if necessary */
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DQUANT = buffer.getbits(2);
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quant += DQ_tab[DQUANT];
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if (quant > 31 || quant < 1)
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{
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quant = max(1, (31, quant));
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/* could set fault-flag and resync here */
|
||
|
fault = 1;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* motion vectors */
|
||
|
if (Mode == MODE_INTER || Mode == MODE_INTER_Q ||
|
||
|
Mode == MODE_INTER4V || Mode == MODE_INTER4V_Q)
|
||
|
{
|
||
|
if (Mode == MODE_INTER4V || Mode == MODE_INTER4V_Q)
|
||
|
{
|
||
|
startmv = 1;
|
||
|
stopmv = 4;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
startmv = 0;
|
||
|
stopmv = 0;
|
||
|
}
|
||
|
|
||
|
for (k = startmv; k <= stopmv; k++)
|
||
|
{
|
||
|
mvx = getTMNMV();
|
||
|
mvy = getTMNMV();
|
||
|
|
||
|
pmv0 = find_pmv(xpos, ypos, k, 0);
|
||
|
pmv1 = find_pmv(xpos, ypos, k, 1);
|
||
|
|
||
|
mvx = motion_decode(mvx, pmv0);
|
||
|
mvy = motion_decode(mvy, pmv1);
|
||
|
|
||
|
/* store coded or not-coded */
|
||
|
coded_map[ypos + 1][xpos + 1] = 1;
|
||
|
MV[0][k][ypos+1][xpos+1] = mvx;
|
||
|
MV[1][k][ypos+1][xpos+1] = mvy;
|
||
|
}
|
||
|
|
||
|
}
|
||
|
/* Intra. */
|
||
|
else
|
||
|
{
|
||
|
}
|
||
|
if (fault)
|
||
|
goto resync;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
/* COD == 1 --> skipped MB */
|
||
|
if (MBA >= MBAmax)
|
||
|
{
|
||
|
/* all macroblocks decoded */
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (PCT_INTER == pict_type || PCT_DISPOSABLE_INTER == pict_type)
|
||
|
buffer.flushbits(1);
|
||
|
|
||
|
Mode = MODE_INTER;
|
||
|
/* Reset CBP */
|
||
|
CBP = CBPB = 0;
|
||
|
coded_map[ypos + 1][xpos + 1] = 0;
|
||
|
|
||
|
/* reset motion vectors */
|
||
|
MV[0][0][ypos + 1][xpos + 1] = 0;
|
||
|
MV[1][0][ypos + 1][xpos + 1] = 0;
|
||
|
}
|
||
|
|
||
|
/* Store mode and prediction type */
|
||
|
modemap[ypos + 1][xpos + 1] = Mode;
|
||
|
|
||
|
/* store defaults for advanced intra coding mode */
|
||
|
|
||
|
if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
|
||
|
{
|
||
|
MV[0][0][ypos + 1][xpos + 1] = MV[1][0][ypos + 1][xpos + 1] = 0;
|
||
|
}
|
||
|
|
||
|
|
||
|
|
||
|
|
||
|
if (!COD)
|
||
|
{
|
||
|
Mode = modemap[ypos + 1][xpos + 1];
|
||
|
|
||
|
/* decode blocks */
|
||
|
for (comp = 0; comp < 6; comp++)
|
||
|
{
|
||
|
clearblock(comp);
|
||
|
if ((Mode == MODE_INTRA || Mode == MODE_INTRA_Q))
|
||
|
{
|
||
|
/* Intra (except in advanced intra coding mode) */
|
||
|
bp = block[comp];
|
||
|
|
||
|
|
||
|
bp[0] = buffer.getbits(8);
|
||
|
|
||
|
if (bp[0] == 255) /* Spec. in H.26P, not in TMN4 */
|
||
|
bp[0] = 128;
|
||
|
bp[0] *= 8; /* Iquant */
|
||
|
if ((CBP & (1 << (6 - 1 - comp))))
|
||
|
{
|
||
|
getblock(comp, 0);
|
||
|
}
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
/* Inter (or Intra in advanced intra coding mode) */
|
||
|
if ((CBP & (1 << (6 - 1 - comp))))
|
||
|
{
|
||
|
getblock(comp, 1);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (fault)
|
||
|
goto resync;
|
||
|
}
|
||
|
|
||
|
}
|
||
|
|
||
|
/* decode the last MB if data is missing */
|
||
|
|
||
|
/* advance to next macroblock */
|
||
|
MBA++;
|
||
|
pCBP = CBP;
|
||
|
pCBPB = CBPB;
|
||
|
pCOD = COD;
|
||
|
pMODB = MODB;
|
||
|
quant_map[ypos + 1][xpos + 1] = quant;
|
||
|
|
||
|
int bx = 16 * xpos;
|
||
|
int by = 16 * ypos;
|
||
|
|
||
|
Mode = modemap[by / 16 + 1][bx / 16 + 1];
|
||
|
|
||
|
/* motion compensation for P-frame */
|
||
|
if (Mode == MODE_INTER || Mode == MODE_INTER_Q ||
|
||
|
Mode == MODE_INTER4V || Mode == MODE_INTER4V_Q)
|
||
|
{
|
||
|
reconstruct(bx, by, Mode);
|
||
|
}
|
||
|
|
||
|
/* copy or add block data into P-picture */
|
||
|
for (comp = 0; comp < 6; comp++)
|
||
|
{
|
||
|
/* inverse DCT */
|
||
|
if (Mode == MODE_INTRA || Mode == MODE_INTRA_Q)
|
||
|
{
|
||
|
idct.idct(block[comp]);
|
||
|
addblock(comp, bx, by, 0);
|
||
|
}
|
||
|
else if ((pCBP & (1 << (6 - 1 - comp))))
|
||
|
{
|
||
|
/* No need to to do this for blocks with no coeffs */
|
||
|
idct.idct(block[comp]);
|
||
|
addblock(comp, bx, by, 1);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static int STRENGTH[] = {1, 1, 2, 2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12, 12};
|
||
|
void Decoder::horiz_edge_filter(unsigned char *rec, int width, int height, int chr)
|
||
|
{
|
||
|
int i, j;
|
||
|
int delta, d1, d2;
|
||
|
int mbc, mbr, do_filter;
|
||
|
int QP;
|
||
|
int mbr_above;
|
||
|
|
||
|
|
||
|
/* horizontal edges */
|
||
|
for (j = 8; j < height; j += 8)
|
||
|
{
|
||
|
if (!chr)
|
||
|
{
|
||
|
mbr = j >> 4;
|
||
|
mbr_above = (j - 8) >> 4;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
mbr = j >> 3;
|
||
|
mbr_above = mbr - 1;
|
||
|
}
|
||
|
const int * const cur_coded_map = coded_map[mbr + 1];
|
||
|
for (i = 0; i < width; i++)
|
||
|
{
|
||
|
// TODO: replace all below with FilterDeblocking8x8HorEdge_H263(rec+i+(j+1)*width, width, QP) and i+=8 ?
|
||
|
if (!chr)
|
||
|
{
|
||
|
mbc = i >> 4;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
mbc = i >> 3;
|
||
|
}
|
||
|
|
||
|
do_filter = cur_coded_map[mbc + 1] || coded_map[mbr_above + 1][mbc + 1];
|
||
|
if (do_filter)
|
||
|
{
|
||
|
QP = cur_coded_map[mbc + 1] ? quant_map[mbr + 1][mbc + 1] : quant_map[mbr_above + 1][mbc + 1];
|
||
|
|
||
|
|
||
|
delta = (int)(((int)(*(rec + i + (j - 2) * width)) +
|
||
|
(int)(*(rec + i + (j - 1) * width) * (-4)) +
|
||
|
(int)(*(rec + i + (j) * width) * (4)) +
|
||
|
(int)(*(rec + i + (j + 1) * width) * (-1))) / 8.0);
|
||
|
|
||
|
d1 = sign(delta) * max(0, abs(delta) - max(0, 2 * (abs(delta) - STRENGTH[QP - 1])));
|
||
|
|
||
|
d2 = min(abs(d1 / 2), max(-abs(d1 / 2), (int)(((*(rec + i + (j - 2) * width) -
|
||
|
*(rec + i + (j + 1) * width))) / 4)));
|
||
|
|
||
|
*(rec + i + (j + 1) * width) += d2; /* D */
|
||
|
*(rec + i + (j) * width) = min(255, max(0, (int)(*(rec + i + (j) * width)) - d1)); /* C */
|
||
|
*(rec + i + (j - 1) * width) = min(255, max(0, (int)(*(rec + i + (j - 1) * width)) + d1)); /* B */
|
||
|
*(rec + i + (j - 2) * width) -= d2; /* A */
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
void Decoder::vert_edge_filter(unsigned char *rec, int width, int height, int chr)
|
||
|
{
|
||
|
int i, j;
|
||
|
int delta, d1, d2;
|
||
|
int mbc, mbr;
|
||
|
int do_filter;
|
||
|
int QP;
|
||
|
int mbc_left;
|
||
|
|
||
|
|
||
|
/* vertical edges */
|
||
|
for (i = 8; i < width; i += 8)
|
||
|
{
|
||
|
if (!chr)
|
||
|
{
|
||
|
mbc = i >> 4;
|
||
|
mbc_left = (i - 8) >> 4;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
mbc = i >> 3;
|
||
|
mbc_left = mbc - 1;
|
||
|
}
|
||
|
// TODO: replace all below with FilterDeblocking8x8VerEdge_H263(rec+i +j*width, width, QP) and i+=8 ?
|
||
|
for (j = 0; j < height; j++)
|
||
|
{
|
||
|
if (!chr)
|
||
|
{
|
||
|
mbr = j >> 4;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
mbr = j >> 3;
|
||
|
|
||
|
}
|
||
|
do_filter = coded_map[mbr + 1][mbc + 1] || coded_map[mbr + 1][mbc_left + 1];
|
||
|
|
||
|
if (do_filter)
|
||
|
{
|
||
|
|
||
|
QP = coded_map[mbr + 1][mbc + 1] ?
|
||
|
quant_map[mbr + 1][mbc + 1] : quant_map[mbr + 1][mbc_left + 1];
|
||
|
|
||
|
delta = (int)(((int)(*(rec + i - 2 + j * width)) +
|
||
|
(int)(*(rec + i - 1 + j * width) * (-4)) +
|
||
|
(int)(*(rec + i + j * width) * (4)) +
|
||
|
(int)(*(rec + i + 1 + j * width) * (-1))) / 8.0);
|
||
|
|
||
|
d1 = sign(delta) * max(0, abs(delta) -
|
||
|
max(0, 2 * (abs(delta) - STRENGTH[QP - 1])));
|
||
|
|
||
|
d2 = min(abs(d1 / 2), max(-abs(d1 / 2),
|
||
|
(int)((*(rec + i - 2 + j * width) -
|
||
|
*(rec + i + 1 + j * width)) / 4)));
|
||
|
|
||
|
*(rec + i + 1 + j * width) += d2; /* D */
|
||
|
*(rec + i + j * width) = min(255, max(0, (int)(*(rec + i + j * width)) - d1)); /* C */
|
||
|
*(rec + i - 1 + j * width) = min(255, max(0, (int)(*(rec + i - 1 + j * width)) + d1)); /* B */
|
||
|
*(rec + i - 2 + j * width) -= d2; /* A */
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
void Decoder::edge_filter(unsigned char *lum, unsigned char *Cb, unsigned char *Cr, int width, int height)
|
||
|
{
|
||
|
|
||
|
/* Luma */
|
||
|
horiz_edge_filter(lum, width, height, 0);
|
||
|
vert_edge_filter(lum, width, height, 0);
|
||
|
|
||
|
/* Chroma */
|
||
|
horiz_edge_filter(Cb, width / 2, height / 2, 1);
|
||
|
vert_edge_filter(Cb, width / 2, height / 2, 1);
|
||
|
horiz_edge_filter(Cr, width / 2, height / 2, 1);
|
||
|
vert_edge_filter(Cr, width / 2, height / 2, 1);
|
||
|
|
||
|
/* that's it */
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
|
||
|
|
||
|
void Decoder::PostFilter(unsigned char *lum, unsigned char *Cb, unsigned char *Cr,
|
||
|
int width, int height)
|
||
|
{
|
||
|
|
||
|
/* Luma */
|
||
|
horiz_post_filter(lum, width, height, 0);
|
||
|
vert_post_filter(lum, width, height, 0);
|
||
|
|
||
|
/* Chroma */
|
||
|
horiz_post_filter(Cb, width / 2, height / 2, 1);
|
||
|
vert_post_filter(Cb, width / 2, height / 2, 1);
|
||
|
horiz_post_filter(Cr, width / 2, height / 2, 1);
|
||
|
vert_post_filter(Cr, width / 2, height / 2, 1);
|
||
|
|
||
|
/* that's it */
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
|
||
|
/***********************************************************************/
|
||
|
|
||
|
static int STRENGTH1[] = {1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4};
|
||
|
void Decoder::horiz_post_filter(unsigned char *rec, int width, int height, int chr)
|
||
|
{
|
||
|
int i, j;
|
||
|
int delta, d1;
|
||
|
int mbc, mbr;
|
||
|
int QP;
|
||
|
int mbr_above;
|
||
|
|
||
|
|
||
|
/* horizontal edges */
|
||
|
for (j = 8; j < height; j += 8)
|
||
|
{
|
||
|
for (i = 0; i < width; i++)
|
||
|
{
|
||
|
if (!chr)
|
||
|
{
|
||
|
mbr = j >> 4;
|
||
|
mbc = i >> 4;
|
||
|
mbr_above = (j - 8) >> 4;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
mbr = j >> 3;
|
||
|
mbc = i >> 3;
|
||
|
mbr_above = mbr - 1;
|
||
|
}
|
||
|
|
||
|
QP = coded_map[mbr + 1][mbc + 1] ?
|
||
|
quant_map[mbr + 1][mbc + 1] : quant_map[mbr_above + 1][mbc + 1];
|
||
|
|
||
|
delta = (int)(((int)(*(rec + i + (j - 3) * width)) +
|
||
|
(int)(*(rec + i + (j - 2) * width)) +
|
||
|
(int)(*(rec + i + (j - 1) * width)) +
|
||
|
(int)(*(rec + i + (j) * width) * (-6)) +
|
||
|
(int)(*(rec + i + (j + 1) * width)) +
|
||
|
(int)(*(rec + i + (j + 2) * width)) +
|
||
|
(int)(*(rec + i + (j + 3) * width))) / 8.0);
|
||
|
|
||
|
d1 = sign(delta) * max(0, abs(delta) - max(0, 2 * (abs(delta) - STRENGTH1[QP - 1])));
|
||
|
|
||
|
/* Filter D */
|
||
|
*(rec + i + (j) * width) += d1;
|
||
|
}
|
||
|
}
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
static int STRENGTH2[] = {1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3};
|
||
|
void Decoder::vert_post_filter(unsigned char *rec, int width, int height, int chr)
|
||
|
{
|
||
|
int i, j;
|
||
|
int delta, d1;
|
||
|
int mbc, mbr;
|
||
|
int QP;
|
||
|
int mbc_left;
|
||
|
|
||
|
|
||
|
/* vertical edges */
|
||
|
for (i = 8; i < width; i += 8)
|
||
|
{
|
||
|
for (j = 0; j < height; j++)
|
||
|
{
|
||
|
if (!chr)
|
||
|
{
|
||
|
mbr = j >> 4;
|
||
|
mbc = i >> 4;
|
||
|
mbc_left = (i - 8) >> 4;
|
||
|
}
|
||
|
else
|
||
|
{
|
||
|
mbr = j >> 3;
|
||
|
mbc = i >> 3;
|
||
|
mbc_left = mbc - 1;
|
||
|
}
|
||
|
|
||
|
QP = coded_map[mbr + 1][mbc + 1] ?
|
||
|
quant_map[mbr + 1][mbc + 1] : quant_map[mbr + 1][mbc_left + 1];
|
||
|
|
||
|
delta = (int)(((int)(*(rec + i - 3 + j * width)) +
|
||
|
(int)(*(rec + i - 2 + j * width)) +
|
||
|
(int)(*(rec + i - 1 + j * width)) +
|
||
|
(int)(*(rec + i + j * width) * (-6)) +
|
||
|
(int)(*(rec + i + 1 + j * width)) +
|
||
|
(int)(*(rec + i + 2 + j * width)) +
|
||
|
(int)(*(rec + i + 3 + j * width))) / 8.0);
|
||
|
|
||
|
d1 = sign(delta) * max(0, abs(delta) - max(0, 2 * (abs(delta) - STRENGTH2[QP - 1])));
|
||
|
|
||
|
/* Post Filter D */
|
||
|
*(rec + i + j * width) += d1;
|
||
|
}
|
||
|
}
|
||
|
return;
|
||
|
}
|