--- postprocessing.c 2003/05/03 23:26:55 1.1 +++ postprocessing.c 2003/12/10 01:02:40 1.1.4.1 @@ -0,0 +1,259 @@ +/***************************************************************************** + * + * XVID MPEG-4 VIDEO CODEC + * - Postprocessing functions - + * + * Copyright(C) 2003 Michael Militzer + * + * This program is free software ; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation ; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY ; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program ; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + ****************************************************************************/ + +#include +#include +#include + +#include "../portab.h" +#include "../global.h" +#include "image.h" +#include "postprocessing.h" + +/* Filtering thresholds */ + +#define THR1 2 +#define THR2 6 + +/* Some useful (and fast) macros + Note that the MIN/MAX macros assume signed shift - if your compiler + doesn't do signed shifts, use the default MIN/MAX macros from global.h */ + +#define FAST_MAX(x,y) ((x) - ((((x) - (y))>>(32 - 1)) & ((x) - (y)))) +#define FAST_MIN(x,y) ((x) + ((((y) - (x))>>(32 - 1)) & ((y) - (x)))) +#define FAST_ABS(x) ((((int)(x)) >> 31) ^ ((int)(x))) - (((int)(x)) >> 31) +#define ABS(X) (((X)>0)?(X):-(X)) + +static int8_t xvid_thresh_tbl[510]; +static int8_t xvid_abs_tbl[510]; + +void init_postproc(void) +{ + int i; + + for(i = -255; i < 256; i++) { + xvid_thresh_tbl[i + 255] = 0; + if(ABS(i) < THR1) + xvid_thresh_tbl[i + 255] = 1; + xvid_abs_tbl[i + 255] = ABS(i); + } +} + +void +image_deblock(IMAGE * img, int edged_width, + const MACROBLOCK * mbs, int mb_width, int mb_height, int mb_stride, + int flags) +{ + const int edged_width2 = edged_width /2; + int i,j; + int quant; + + /* luma: j,i in block units */ + if ((flags & XVID_DEBLOCKY)) + { + for (j = 1; j < mb_height*2; j++) /* horizontal deblocking */ + for (i = 0; i < mb_width*2; i++) + { + quant = mbs[(j+0)/2*mb_stride + (i/2)].quant; + deblock8x8_h(img->y + j*8*edged_width + i*8, edged_width, quant); + } + + for (j = 0; j < mb_height*2; j++) /* vertical deblocking */ + for (i = 1; i < mb_width*2; i++) + { + quant = mbs[(j+0)/2*mb_stride + (i/2)].quant; + deblock8x8_v(img->y + j*8*edged_width + i*8, edged_width, quant); + } + } + + + /* chroma */ + if ((flags & XVID_DEBLOCKUV)) + { + for (j = 1; j < mb_height; j++) /* horizontal deblocking */ + for (i = 0; i < mb_width; i++) + { + quant = mbs[(j+0)*mb_stride + i].quant; + deblock8x8_h(img->u + j*8*edged_width2 + i*8, edged_width2, quant); + deblock8x8_h(img->v + j*8*edged_width2 + i*8, edged_width2, quant); + } + + for (j = 0; j < mb_height; j++) /* vertical deblocking */ + for (i = 1; i < mb_width; i++) + { + quant = mbs[(j+0)*mb_stride + i].quant; + deblock8x8_v(img->u + j*8*edged_width2 + i*8, edged_width2, quant); + deblock8x8_v(img->v + j*8*edged_width2 + i*8, edged_width2, quant); + } + } +} + +#define LOAD_DATA_HOR(x) \ + /* Load pixel addresses and data for filtering */ \ + s[0] = *(v[0] = img - 5*stride + x); \ + s[1] = *(v[1] = img - 4*stride + x); \ + s[2] = *(v[2] = img - 3*stride + x); \ + s[3] = *(v[3] = img - 2*stride + x); \ + s[4] = *(v[4] = img - 1*stride + x); \ + s[5] = *(v[5] = img + 0*stride + x); \ + s[6] = *(v[6] = img + 1*stride + x); \ + s[7] = *(v[7] = img + 2*stride + x); \ + s[8] = *(v[8] = img + 3*stride + x); \ + s[9] = *(v[9] = img + 4*stride + x); + +#define LOAD_DATA_VER(x) \ + /* Load pixel addresses and data for filtering */ \ + s[0] = *(v[0] = img + x*stride - 5); \ + s[1] = *(v[1] = img + x*stride - 4); \ + s[2] = *(v[2] = img + x*stride - 3); \ + s[3] = *(v[3] = img + x*stride - 2); \ + s[4] = *(v[4] = img + x*stride - 1); \ + s[5] = *(v[5] = img + x*stride + 0); \ + s[6] = *(v[6] = img + x*stride + 1); \ + s[7] = *(v[7] = img + x*stride + 2); \ + s[8] = *(v[8] = img + x*stride + 3); \ + s[9] = *(v[9] = img + x*stride + 4); + +#define APPLY_FILTER_CORE \ + /* First, decide whether to use default or DC-offset mode */ \ + \ + eq_cnt = 0; \ + \ + eq_cnt += xvid_thresh_tbl[s[0] - s[1] + 255]; \ + eq_cnt += xvid_thresh_tbl[s[1] - s[2] + 255]; \ + eq_cnt += xvid_thresh_tbl[s[2] - s[3] + 255]; \ + eq_cnt += xvid_thresh_tbl[s[3] - s[4] + 255]; \ + eq_cnt += xvid_thresh_tbl[s[4] - s[5] + 255]; \ + eq_cnt += xvid_thresh_tbl[s[5] - s[6] + 255]; \ + eq_cnt += xvid_thresh_tbl[s[6] - s[7] + 255]; \ + eq_cnt += xvid_thresh_tbl[s[7] - s[8] + 255]; \ + \ + if(eq_cnt < THR2) { /* Default mode */ \ + int a30, a31, a32; \ + int diff, limit; \ + \ + a30 = ((s[3]<<1) - s[4] * 5 + s[5] * 5 - (s[6]<<1)); \ + \ + if(xvid_abs_tbl[a30 + 255] < 8*quant) { \ + a31 = ((s[1]<<1) - s[2] * 5 + s[3] * 5 - (s[4]<<1)); \ + a32 = ((s[5]<<1) - s[6] * 5 + s[7] * 5 - (s[8]<<1)); \ + \ + diff = (5 * ((SIGN(a30) * MIN(xvid_abs_tbl[a30 + 255], MIN(xvid_abs_tbl[a31 + 255], xvid_abs_tbl[a32 + 255]))) - a30) + 32) >> 6; \ + limit = (s[4] - s[5]) / 2; \ + \ + if (limit > 0) \ + diff = (diff < 0) ? 0 : ((diff > limit) ? limit : diff); \ + else \ + diff = (diff > 0) ? 0 : ((diff < limit) ? limit : diff); \ + \ + *v[4] -= diff; \ + *v[5] += diff; \ + } \ + } \ + else { /* DC-offset mode */ \ + uint8_t p0, p9; \ + int min, max; \ + \ + /* Now decide whether to apply smoothing filter or not */ \ + max = FAST_MAX(s[1], FAST_MAX(s[2], FAST_MAX(s[3], FAST_MAX(s[4], FAST_MAX(s[5], FAST_MAX(s[6], FAST_MAX(s[7], s[8]))))))); \ + min = FAST_MIN(s[1], FAST_MIN(s[2], FAST_MIN(s[3], FAST_MIN(s[4], FAST_MIN(s[5], FAST_MIN(s[6], FAST_MIN(s[7], s[8]))))))); \ + \ + if(((max-min)) < 2*quant) { \ + \ + /* Choose edge pixels */ \ + p0 = (xvid_abs_tbl[(s[1] - s[0]) + 255] < quant) ? s[0] : s[1]; \ + p9 = (xvid_abs_tbl[(s[8] - s[9]) + 255] < quant) ? s[9] : s[8]; \ + \ + *v[1] = (uint8_t) ((6*p0 + (s[1]<<2) + (s[2]<<1) + (s[3]<<1) + s[4] + s[5] + 8) >> 4); \ + *v[2] = (uint8_t) (((p0<<2) + (s[1]<<1) + (s[2]<<2) + (s[3]<<1) + (s[4]<<1) + s[5] + s[6] + 8) >> 4); \ + *v[3] = (uint8_t) (((p0<<1) + (s[1]<<1) + (s[2]<<1) + (s[3]<<2) + (s[4]<<1) + (s[5]<<1) + s[6] + s[7] + 8) >> 4); \ + *v[4] = (uint8_t) ((p0 + s[1] + (s[2]<<1) + (s[3]<<1) + (s[4]<<2) + (s[5]<<1) + (s[6]<<1) + s[7] + s[8] + 8) >> 4); \ + *v[5] = (uint8_t) ((s[1] + s[2] + (s[3]<<1) + (s[4]<<1) + (s[5]<<2) + (s[6]<<1) + (s[7]<<1) + s[8] + p9 + 8) >> 4); \ + *v[6] = (uint8_t) ((s[2] + s[3] + (s[4]<<1) + (s[5]<<1) + (s[6]<<2) + (s[7]<<1) + (s[8]<<1) + (p9<<1) + 8) >> 4); \ + *v[7] = (uint8_t) ((s[3] + s[4] + (s[5]<<1) + (s[6]<<1) + (s[7]<<2) + (s[8]<<1) + (p9<<2) + 8) >> 4); \ + *v[8] = (uint8_t) ((s[4] + s[5] + (s[6]<<1) + (s[7]<<1) + (s[8]<<2) + 6*p9 + 8) >> 4); \ + } \ + } + +void deblock8x8_h(uint8_t *img, int stride, int quant) +{ + int eq_cnt; + uint8_t *v[10]; + int32_t s[10]; + + LOAD_DATA_HOR(0) + APPLY_FILTER_CORE + + LOAD_DATA_HOR(1) + APPLY_FILTER_CORE + + LOAD_DATA_HOR(2) + APPLY_FILTER_CORE + + LOAD_DATA_HOR(3) + APPLY_FILTER_CORE + + LOAD_DATA_HOR(4) + APPLY_FILTER_CORE + + LOAD_DATA_HOR(5) + APPLY_FILTER_CORE + + LOAD_DATA_HOR(6) + APPLY_FILTER_CORE + + LOAD_DATA_HOR(7) + APPLY_FILTER_CORE +} + + +void deblock8x8_v(uint8_t *img, int stride, int quant) +{ + int eq_cnt; + uint8_t *v[10]; + int s[10]; + + LOAD_DATA_VER(0) + APPLY_FILTER_CORE + + LOAD_DATA_VER(1) + APPLY_FILTER_CORE + + LOAD_DATA_VER(2) + APPLY_FILTER_CORE + + LOAD_DATA_VER(3) + APPLY_FILTER_CORE + + LOAD_DATA_VER(4) + APPLY_FILTER_CORE + + LOAD_DATA_VER(5) + APPLY_FILTER_CORE + + LOAD_DATA_VER(6) + APPLY_FILTER_CORE + + LOAD_DATA_VER(7) + APPLY_FILTER_CORE +} \ No newline at end of file