compensate.c

来自「quicktime linux播放器v1」· C语言 代码 · 共 65 行

/**************************************************************************
 *
 *	XVID MPEG-4 VIDEO CODEC
 *	motion compensation
 *
 *	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:
 *
 *	06.11.2001	inital version; (c)2001 peter ross <[e-mail]>
 *
 *************************************************************************/



#include "compensate.h"


/*
perform motion compensation (and 8bit->16bit dct transfer)
*/

void compensate(int16_t * const dct,
				uint8_t * const cur,
				const uint8_t * ref,
				const uint32_t stride)
{
	uint32_t i, j;

	for (j = 0; j < 8; j++)
	{
		for (i = 0; i < 8; i++)
		{
			uint8_t c = cur[j * stride + i];
			uint8_t r = ref[j * stride + i];
			cur[j * stride + i] = r;
			dct[j * 8 + i] = (int16_t)c - (int16_t)r;
		}
	}
}