/***************************************************************************** * * XVID MPEG-4 VIDEO CODEC * Reduced-Resolution utilities * * Copyright(C) 2002 Pascal Massimino * * This file is part of XviD, a free MPEG-4 video encoder/decoder * * XviD 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 * * Under section 8 of the GNU General Public License, the copyright * holders of XVID explicitly forbid distribution in the following * countries: * * - Japan * - United States of America * * Linking XviD statically or dynamically with other modules is making a * combined work based on XviD. Thus, the terms and conditions of the * GNU General Public License cover the whole combination. * * As a special exception, the copyright holders of XviD give you * permission to link XviD with independent modules that communicate with * XviD solely through the VFW1.1 and DShow interfaces, regardless of the * license terms of these independent modules, and to copy and distribute * the resulting combined work under terms of your choice, provided that * every copy of the combined work is accompanied by a complete copy of * the source code of XviD (the version of XviD used to produce the * combined work), being distributed under the terms of the GNU General * Public License plus this exception. An independent module is a module * which is not derived from or based on XviD. * * Note that people who make modified versions of XviD are not obligated * to grant this special exception for their modified versions; it is * their choice whether to do so. The GNU General Public License gives * permission to release a modified version without this exception; this * exception also makes it possible to release a modified version which * carries forward this exception. * * $Id: reduced.c,v 1.2 2003-02-15 15:22:18 edgomez Exp $ * ****************************************************************************/ #include "../portab.h" #include "../global.h" #include "reduced.h" // function pointers COPY_UPSAMPLED_8X8_16TO8 * copy_upsampled_8x8_16to8; ADD_UPSAMPLED_8X8_16TO8 * add_upsampled_8x8_16to8; VFILTER_31 * vfilter_31; HFILTER_31 * hfilter_31; FILTER_18X18_TO_8X8 * filter_18x18_to_8x8; FILTER_DIFF_18X18_TO_8X8 * filter_diff_18x18_to_8x8; ////////////////////////////////////////////////////////// // Upsampling (1/3/3/1) filter #define ADD(dst,src) (dst) = CLIP((dst)+(src), 0, 255) static __inline void Filter_31(uint8_t *Dst1, uint8_t *Dst2, const int16_t *Src1, const int16_t *Src2) { /* Src[] is assumed to be >=0. So we can use ">>2" instead of "/2" */ int16_t a = (3*Src1[0]+ Src2[0]+2) >> 2; int16_t b = ( Src1[0]+3*Src2[0]+2) >> 2; Dst1[0] = CLIP(a, 0, 255); Dst2[0] = CLIP(b, 0, 255); } static __inline void Filter_9331(uint8_t *Dst1, uint8_t *Dst2, const int16_t *Src1, const int16_t *Src2) { /* Src[] is assumed to be >=0. So we can use ">>4" instead of "/16" */ int16_t a = (9*Src1[0]+ 3*Src1[1]+ 3*Src2[0] + 1*Src2[1] + 8) >> 4; int16_t b = (3*Src1[0]+ 9*Src1[1]+ 1*Src2[0] + 3*Src2[1] + 8) >> 4; int16_t c = (3*Src1[0]+ 1*Src1[1]+ 9*Src2[0] + 3*Src2[1] + 8) >> 4; int16_t d = (1*Src1[0]+ 3*Src1[1]+ 3*Src2[0] + 9*Src2[1] + 8) >> 4; Dst1[0] = CLIP(a, 0, 255); Dst1[1] = CLIP(b, 0, 255); Dst2[0] = CLIP(c, 0, 255); Dst2[1] = CLIP(d, 0, 255); } void xvid_Copy_Upsampled_8x8_16To8_C(uint8_t *Dst, const int16_t *Src, const int BpS) { int x, y; Dst[0] = CLIP(Src[0], 0, 255); for(x=0; x<7; ++x) Filter_31(Dst+2*x+1, Dst+2*x+2, Src+x, Src+x+1); Dst[15] = CLIP(Src[7], 0, 255); Dst += BpS; for(y=0; y<7; ++y) { uint8_t *const Dst2 = Dst + BpS; Filter_31(Dst, Dst2, Src, Src+8); for(x=0; x<7; ++x) Filter_9331(Dst+2*x+1, Dst2+2*x+1, Src+x, Src+x+8); Filter_31(Dst+15, Dst2+15, Src+7, Src+7+8); Src += 8; Dst += 2*BpS; } Dst[0] = CLIP(Src[0], 0, 255); for(x=0; x<7; ++x) Filter_31(Dst+2*x+1, Dst+2*x+2, Src+x, Src+x+1); Dst[15] = CLIP(Src[7], 0, 255); } static __inline void Filter_Add_31(uint8_t *Dst1, uint8_t *Dst2, const int16_t *Src1, const int16_t *Src2) { /* Here, we must use "/4", since Src[] is in [-256, 255] */ int16_t a = (3*Src1[0]+ Src2[0] + 2) / 4; int16_t b = ( Src1[0]+3*Src2[0] + 2) / 4; ADD(Dst1[0], a); ADD(Dst2[0], b); } static __inline void Filter_Add_9331(uint8_t *Dst1, uint8_t *Dst2, const int16_t *Src1, const int16_t *Src2) { int16_t a = (9*Src1[0]+ 3*Src1[1]+ 3*Src2[0] + 1*Src2[1] + 8) / 16; int16_t b = (3*Src1[0]+ 9*Src1[1]+ 1*Src2[0] + 3*Src2[1] + 8) / 16; int16_t c = (3*Src1[0]+ 1*Src1[1]+ 9*Src2[0] + 3*Src2[1] + 8) / 16; int16_t d = (1*Src1[0]+ 3*Src1[1]+ 3*Src2[0] + 9*Src2[1] + 8) / 16; ADD(Dst1[0], a); ADD(Dst1[1], b); ADD(Dst2[0], c); ADD(Dst2[1], d); } void xvid_Add_Upsampled_8x8_16To8_C(uint8_t *Dst, const int16_t *Src, const int BpS) { int x, y; ADD(Dst[0], Src[0]); for(x=0; x<7; ++x) Filter_Add_31(Dst+2*x+1, Dst+2*x+2, Src+x, Src+x+1); ADD(Dst[15], Src[7]); Dst += BpS; for(y=0; y<7; ++y) { uint8_t *const Dst2 = Dst + BpS; Filter_Add_31(Dst, Dst2, Src, Src+8); for(x=0; x<7; ++x) Filter_Add_9331(Dst+2*x+1, Dst2+2*x+1, Src+x, Src+x+8); Filter_Add_31(Dst+15, Dst2+15, Src+7, Src+7+8); Src += 8; Dst += 2*BpS; } ADD(Dst[0], Src[0]); for(x=0; x<7; ++x) Filter_Add_31(Dst+2*x+1, Dst+2*x+2, Src+x, Src+x+1); ADD(Dst[15], Src[7]); } #undef ADD ////////////////////////////////////////////////////////// // horizontal and vertical deblocking void xvid_HFilter_31_C(uint8_t *Src1, uint8_t *Src2, int Nb_Blks) { Nb_Blks *= 8; while(Nb_Blks-->0) { uint8_t a = ( 3*Src1[0] + 1*Src2[0] + 2 ) >> 2; uint8_t b = ( 1*Src1[0] + 3*Src2[0] + 2 ) >> 2; *Src1++ = a; *Src2++ = b; } } void xvid_VFilter_31_C(uint8_t *Src1, uint8_t *Src2, const int BpS, int Nb_Blks) { Nb_Blks *= 8; while(Nb_Blks-->0) { uint8_t a = ( 3*Src1[0] + 1*Src2[0] + 2 ) >> 2; uint8_t b = ( 1*Src1[0] + 3*Src2[0] + 2 ) >> 2; *Src1 = a; *Src2 = b; Src1 += BpS; Src2 += BpS; } } ////////////////////////////////////////////////////////// // 16x16 -> 8x8 (1/3/3/1) downsampling // // Warning! These read 1 pixel outside of the input 16x16 block! // ////////////////////////////////////////////////////////// void xvid_Filter_18x18_To_8x8_C(int16_t *Dst, const uint8_t *Src, const int BpS) { int16_t *T, Tmp[18*8]; int i, j; T = Tmp; Src -= BpS; for(j=-1; j<17; j++) { for(i=0; i<8; ++i) T[i] = Src[2*i-1] + 3*Src[2*i+0] + 3*Src[2*i+1] + Src[2*i+2]; T += 8; Src += BpS; } T = Tmp + 8; for(j=0; j<8; j++) { for(i=0; i<8; ++i) Dst[i] = ( T[-8+i] + 3*T[0+i] + 3*T[8+i] + T[16+i] + 32 ) / 64; Dst += 8; T += 16; } } void xvid_Filter_Diff_18x18_To_8x8_C(int16_t *Dst, const uint8_t *Src, const int BpS) { int16_t *T, Tmp[18*8]; int i, j; T = Tmp; Src -= BpS; for(j=-1; j<17; j++) { for(i=0; i<8; ++i) T[i] = Src[2*i-1] + 3*Src[2*i+0] + 3*Src[2*i+1] + Src[2*i+2]; T += 8; Src += BpS; } T = Tmp; for(j=0; j<8; j++) { for(i=0; i<8; ++i) Dst[i] -= ( T[i] + 3*T[8+i] + 3*T[16+i] + T[24+i] + 32 ) / 64; Dst += 8; T += 16; } } //////////////////////////////////////////////////////////