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