sad.c

quicktime linux播放器v1

/**************************************************************************
 *
 *	XVID MPEG-4 VIDEO CODEC
 *	sum of absolute difference
 *
 *	This program is an implementation of a part of one or more MPEG-4
 *	Video tools as specified in ISO/IEC 14496-2 standard.  Those intending
 *	to use this software module in hardware or software products are
 *	advised that its use may infringe existing patents or copyrights, and
 *	any such use would be at such party's own risk.  The original
 *	developer of this software module and his/her company, and subsequent
 *	editors and their companies, will have no liability for use of this
 *	software or modifications or derivatives thereof.
 *
 *	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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *************************************************************************/

/**************************************************************************
 *
 *	History:
 *
 *	10.11.2001	initial version; (c)2001 peter ross <[e-mail]>
 *
 *************************************************************************/


#include "enc_portab.h"
#include "sad.h"

uint32_t sad16(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;

	for (j = 0; j < 16; j++) {
		for (i = 0; i < 16; i++) {
			sad += abs(cur[j*stride + i] - ref[j*stride + i]);
			if (sad >= best_sad) {
				return sad;
			}
		}
	}

	return sad;
}



uint32_t sad8(const uint8_t * const cur,
					const uint8_t * const ref,
					const uint32_t stride)
{
	uint32_t sad = 0;
	uint32_t i, j;

//printf("sad8 %p %p %d\n", cur[0], ref[0], stride);
	for (j = 0; j < 8; j++) 
	{
		sad += abs(cur[j * stride + 0] - ref[j * stride + 0]);
		sad += abs(cur[j * stride + 1] - ref[j * stride + 1]);
		sad += abs(cur[j * stride + 2] - ref[j * stride + 2]);
		sad += abs(cur[j * stride + 3] - ref[j * stride + 3]);
		sad += abs(cur[j * stride + 4] - ref[j * stride + 4]);
		sad += abs(cur[j * stride + 5] - ref[j * stride + 5]);
		sad += abs(cur[j * stride + 6] - ref[j * stride + 6]);
		sad += abs(cur[j * stride + 7] - ref[j * stride + 7]);
	}

	return sad;
}




/* average deviation from mean */

uint32_t dev16(const uint8_t * const cur,
				const uint32_t stride)
{
	uint32_t mean = 0;
	uint32_t dev = 0;
	uint32_t i,j;

	for (j = 0; j < 16; j++) {
		for (i = 0; i < 16; i++) {
			mean += cur[j*stride + i];
		}
	}
	mean /= (16 * 16);

	for (j = 0; j < 16; j++) {
		for (i = 0; i < 16; i++) {
			dev += abs(cur[j*stride + i] - mean);
		}
	}

	return dev;
}