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* XVID MPEG-4 VIDEO CODEC |
* XVID MPEG-4 VIDEO CODEC |
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* - Motion Compensation module - |
* - Motion Compensation module - |
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* |
* |
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* Copyright(C) 2002 Michael Militzer <michael@xvid.org> |
* Copyright(C) 2002 Peter Ross <pross@xvid.org> |
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* Copyright(C) 2002 Edouard Gomez <ed.gomez@wanadoo.fr> |
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* Copyright(C) 2002 Christoph Lampert <gruel@web.de> |
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* |
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* This program is an implementation of a part of one or more MPEG-4 |
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* Video tools as specified in ISO/IEC 14496-2 standard. Those intending |
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* to use this software module in hardware or software products are |
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* advised that its use may infringe existing patents or copyrights, and |
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* any such use would be at such party's own risk. The original |
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* developer of this software module and his/her company, and subsequent |
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* editors and their companies, will have no liability for use of this |
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* software or modifications or derivatives thereof. |
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* |
* |
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* This program is free software; you can redistribute it and/or modify |
* This file is part of XviD, a free MPEG-4 video encoder/decoder |
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* it under the terms of the GNU General Public License as published by |
* |
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* XviD is free software; you can redistribute it and/or modify it |
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* 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 |
* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
* (at your option) any later version. |
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* |
* |
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* along with this program; if not, write to the Free Software |
* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
* |
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* Under section 8 of the GNU General Public License, the copyright |
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* holders of XVID explicitly forbid distribution in the following |
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* countries: |
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* |
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* - Japan |
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* - United States of America |
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* |
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* Linking XviD statically or dynamically with other modules is making a |
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* combined work based on XviD. Thus, the terms and conditions of the |
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* GNU General Public License cover the whole combination. |
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* |
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* As a special exception, the copyright holders of XviD give you |
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* permission to link XviD with independent modules that communicate with |
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* XviD solely through the VFW1.1 and DShow interfaces, regardless of the |
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* license terms of these independent modules, and to copy and distribute |
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* the resulting combined work under terms of your choice, provided that |
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* every copy of the combined work is accompanied by a complete copy of |
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* the source code of XviD (the version of XviD used to produce the |
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* combined work), being distributed under the terms of the GNU General |
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* Public License plus this exception. An independent module is a module |
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* which is not derived from or based on XviD. |
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* |
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* Note that people who make modified versions of XviD are not obligated |
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* to grant this special exception for their modified versions; it is |
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* their choice whether to do so. The GNU General Public License gives |
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* permission to release a modified version without this exception; this |
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* exception also makes it possible to release a modified version which |
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* carries forward this exception. |
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* |
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* $Id: motion_comp.c,v 1.16 2002-11-26 23:44:10 edgomez Exp $ |
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* |
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*************************************************************************/ |
*************************************************************************/ |
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#include "../encoder.h" |
#include "../encoder.h" |
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{ |
{ |
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int32_t ddx, ddy; |
int32_t ddx, ddy; |
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switch (((dx & 1) << 1) + (dy & 1)) // ((dx%2)?2:0)+((dy%2)?1:0) |
switch (((dx & 1) << 1) + (dy & 1)) /* ((dx%2)?2:0)+((dy%2)?1:0) */ |
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{ |
{ |
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case 0: |
case 0: |
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ddx = dx / 2; |
ddx = dx / 2; |
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refh + (int) ((y + ddy) * stride + x + ddx), stride); |
refh + (int) ((y + ddy) * stride + x + ddx), stride); |
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break; |
break; |
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default: // case 3: |
default: /* case 3: */ |
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ddx = (dx - 1) / 2; |
ddx = (dx - 1) / 2; |
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ddy = (dy - 1) / 2; |
ddy = (dy - 1) / 2; |
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transfer_8to16sub(dct_codes, cur + y * stride + x, |
transfer_8to16sub(dct_codes, cur + y * stride + x, |
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refv->v + 8 * j * edged_width / 2 + 8 * i, |
refv->v + 8 * j * edged_width / 2 + 8 * i, |
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edged_width / 2); |
edged_width / 2); |
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} else // mode == MODE_INTER4V |
} else /* mode == MODE_INTER4V */ |
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{ |
{ |
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int32_t sum, dx, dy; |
int32_t sum, dx, dy; |
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