/***************************************************************************** * * XVID MPEG-4 VIDEO CODEC * - SAD calculation module (C part) - * * Copyright(C) 2002 Michael Militzer * 2002 Peter Ross * * 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: sad.c,v 1.12 2002-11-26 23:44:11 edgomez Exp $ * ****************************************************************************/ #include "../portab.h" #include "sad.h" sad16FuncPtr sad16; sad8FuncPtr sad8; sad16biFuncPtr sad16bi; sad8biFuncPtr sad8bi; /* not really sad16, but no difference in prototype */ dev16FuncPtr dev16; sadInitFuncPtr sadInit; #define ABS(X) (((X)>0)?(X):-(X)) #define MRSAD16_CORRFACTOR 8 uint32_t mrsad16_c(const uint8_t * const cur, const uint8_t * const ref, const uint32_t stride, const uint32_t best_sad) { uint32_t sad = 0; int32_t mean = 0; uint32_t i, j; uint8_t const *ptr_cur = cur; uint8_t const *ptr_ref = ref; for (j = 0; j < 16; j++) { for (i = 0; i < 16; i++) { mean += ((int) *(ptr_cur + i) - (int) *(ptr_ref + i)); } ptr_cur += stride; ptr_ref += stride; } mean /= 256; for (j = 0; j < 16; j++) { ptr_cur -= stride; ptr_ref -= stride; for (i = 0; i < 16; i++) { sad += ABS(*(ptr_cur + i) - *(ptr_ref + i) - mean); if (sad >= best_sad) { return MRSAD16_CORRFACTOR * sad; } } } return MRSAD16_CORRFACTOR * sad; } uint32_t sad16_c(const uint8_t * const cur, const uint8_t * const ref, const uint32_t stride, const uint32_t best_sad) { uint32_t sad = 0; uint32_t i, j; uint8_t const *ptr_cur = cur; uint8_t const *ptr_ref = ref; for (j = 0; j < 16; j++) { for (i = 0; i < 16; i++) { sad += ABS(*(ptr_cur + i) - *(ptr_ref + i)); if (sad >= best_sad) { return sad; } } ptr_cur += stride; ptr_ref += stride; } return sad; } uint32_t sad16bi_c(const uint8_t * const cur, const uint8_t * const ref1, const uint8_t * const ref2, const uint32_t stride) { uint32_t sad = 0; uint32_t i, j; uint8_t const *ptr_cur = cur; uint8_t const *ptr_ref1 = ref1; uint8_t const *ptr_ref2 = ref2; for (j = 0; j < 16; j++) { for (i = 0; i < 16; i++) { int pixel = (ptr_ref1[i] + ptr_ref2[i] + 1) / 2; if (pixel < 0) { pixel = 0; } else if (pixel > 255) { pixel = 255; } sad += ABS(ptr_cur[i] - pixel); } ptr_cur += stride; ptr_ref1 += stride; ptr_ref2 += stride; } return sad; } uint32_t sad8bi_c(const uint8_t * const cur, const uint8_t * const ref1, const uint8_t * const ref2, const uint32_t stride) { uint32_t sad = 0; uint32_t i, j; uint8_t const *ptr_cur = cur; uint8_t const *ptr_ref1 = ref1; uint8_t const *ptr_ref2 = ref2; for (j = 0; j < 8; j++) { for (i = 0; i < 8; i++) { int pixel = (ptr_ref1[i] + ptr_ref2[i] + 1) / 2; if (pixel < 0) { pixel = 0; } else if (pixel > 255) { pixel = 255; } sad += ABS(ptr_cur[i] - pixel); } ptr_cur += stride; ptr_ref1 += stride; ptr_ref2 += stride; } return sad; } uint32_t sad8_c(const uint8_t * const cur, const uint8_t * const ref, const uint32_t stride) { uint32_t sad = 0; uint32_t i, j; uint8_t const *ptr_cur = cur; uint8_t const *ptr_ref = ref; for (j = 0; j < 8; j++) { for (i = 0; i < 8; i++) { sad += ABS(*(ptr_cur + i) - *(ptr_ref + i)); } ptr_cur += stride; ptr_ref += stride; } return sad; } /* average deviation from mean */ uint32_t dev16_c(const uint8_t * const cur, const uint32_t stride) { uint32_t mean = 0; uint32_t dev = 0; uint32_t i, j; uint8_t const *ptr_cur = cur; for (j = 0; j < 16; j++) { for (i = 0; i < 16; i++) mean += *(ptr_cur + i); ptr_cur += stride; } mean /= (16 * 16); ptr_cur = cur; for (j = 0; j < 16; j++) { for (i = 0; i < 16; i++) dev += ABS(*(ptr_cur + i) - (int32_t) mean); ptr_cur += stride; } return dev; }