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/************************************************************************** |
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* |
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* XVID MPEG-4 VIDEO CODEC |
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* sum of absolute difference |
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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., 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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*************************************************************************/ |
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|
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/************************************************************************** |
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* |
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* History: |
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* |
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* 14.02.2002 added sad16bi_c() |
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* 10.11.2001 initial version; (c)2001 peter ross <pross@cs.rmit.edu.au> |
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* |
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*************************************************************************/ |
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|
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|
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#include "../portab.h" |
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#include "sad.h" |
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|
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sad16FuncPtr sad16; |
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sad8FuncPtr sad8; |
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sad16biFuncPtr sad16bi; |
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sad8biFuncPtr sad8bi; // not really sad16, but no difference in prototype |
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dev16FuncPtr dev16; |
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|
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sadInitFuncPtr sadInit; |
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|
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#define ABS(X) (((X)>0)?(X):-(X)) |
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|
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uint32_t |
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sad8FuncPtr sad8; |
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const uint8_t * const ref, |
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|
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const uint32_t best_sad) |
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{ |
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|
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uint32_t sad = 0; |
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int32_t mean = 0; |
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uint32_t i, j; |
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uint8_t const *ptr_cur = cur; |
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uint8_t const *ptr_ref = ref; |
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|
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for (j = 0; j < 16; j++) { |
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for (i = 0; i < 16; i++) { |
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mean += ((int) *(ptr_cur + i) - (int) *(ptr_ref + i)); |
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} |
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ptr_cur += stride; |
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ptr_ref += stride; |
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|
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} |
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mean /= 256; |
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|
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for (j = 0; j < 16; j++) { |
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|
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ptr_cur -= stride; |
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ptr_ref -= stride; |
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|
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for (i = 0; i < 16; i++) { |
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|
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sad += ABS(*(ptr_cur + i) - *(ptr_ref + i) - mean); |
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if (sad >= best_sad) { |
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return MRSAD16_CORRFACTOR * sad; |
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} |
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} |
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} |
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|
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return MRSAD16_CORRFACTOR * sad; |
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|
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} |
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|
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|
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uint32_t |
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sad16_c(const uint8_t * const cur, |
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const uint8_t * const ref, |
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const uint32_t stride, |
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const uint32_t best_sad) |
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{ |
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|
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uint32_t sad = 0; |
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uint32_t i, j; |
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uint8_t const *ptr_cur = cur; |
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uint8_t const *ptr_ref = ref; |
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|
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for (j = 0; j < 16; j++) { |
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|
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for (i = 0; i < 16; i++) { |
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|
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sad += ABS(*(ptr_cur + i) - *(ptr_ref + i)); |
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|
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if (sad >= best_sad) { |
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return sad; |
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} |
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|
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|
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} |
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|
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ptr_cur += stride; |
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ptr_ref += stride; |
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|
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} |
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|
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return sad; |
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|
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} |
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|
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|
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|
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uint32_t |
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sad16bi_c(const uint8_t * const cur, |
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const uint8_t * const ref1, |
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const uint8_t * const ref2, |
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const uint32_t stride) |
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{ |
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|
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uint32_t sad = 0; |
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uint32_t i, j; |
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uint8_t const *ptr_cur = cur; |
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uint8_t const *ptr_ref1 = ref1; |
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uint8_t const *ptr_ref2 = ref2; |
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|
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for (j = 0; j < 16; j++) { |
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|
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for (i = 0; i < 16; i++) { |
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int pixel = (ptr_ref1[i] + ptr_ref2[i] + 1) / 2; |
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|
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if (pixel < 0) { |
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pixel = 0; |
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} else if (pixel > 255) { |
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pixel = 255; |
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} |
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|
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sad += ABS(ptr_cur[i] - pixel); |
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} |
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|
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ptr_cur += stride; |
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ptr_ref1 += stride; |
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ptr_ref2 += stride; |
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|
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} |
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|
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return sad; |
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|
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} |
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|
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uint32_t |
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sad8bi_c(const uint8_t * const cur, |
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const uint8_t * const ref1, |
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const uint8_t * const ref2, |
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const uint32_t stride) |
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{ |
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|
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uint32_t sad = 0; |
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uint8_t const *ptr_cur = cur; |
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uint8_t const *ptr_ref = ref; |
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|
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for (j = 0; j < 8; j++) { |
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|
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for (i = 0; i < 8; i++) { |
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sad += ABS(*(ptr_cur + i) - *(ptr_ref + i)); |
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} |
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|
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ptr_cur += stride; |
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ptr_ref += stride; |
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|
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} |
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|
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return sad; |
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} |
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|
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|
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|
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|
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/* average deviation from mean */ |
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|
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uint32_t |
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dev16_c(const uint8_t * const cur, |
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const uint32_t stride) |
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{ |
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|
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uint32_t mean = 0; |
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uint32_t dev = 0; |
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uint32_t i, j; |
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uint8_t const *ptr_cur = cur; |
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|
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for (j = 0; j < 16; j++) { |
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|
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for (i = 0; i < 16; i++) |
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mean += *(ptr_cur + i); |
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|
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ptr_cur += stride; |
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|
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} |
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|
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mean /= (16 * 16); |
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ptr_cur = cur; |
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|
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for (j = 0; j < 16; j++) { |
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|
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for (i = 0; i < 16; i++) |
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dev += ABS(*(ptr_cur + i) - (int32_t) mean); |
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|
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ptr_cur += stride; |
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|
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} |
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|
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return dev; |
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} |
