macros.h

文件内包含H.263视频编码算法和解码算法2个文件

/************************************************************************
 *
 *  macros.h, part of tmn (TMN encoder)
 *  Copyright (C) 1996  Telenor R&D, Norway
 *        Karl Olav Lillevold <[e-mail]>
 *
 *  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.
 *
 *  Karl Olav Lillevold               <[e-mail]>
 *  Telenor Research and Development
 *  P.O.Box 83                        tel.:   [phone]
 *  N-2007 Kjeller, Norway            fax.:   [phone]
 *
 *  Robert Danielsen                  e-mail: [e-mail]
 *  Telenor Research and Development  www:    http://www.nta.no/brukere/DVC/
 *  P.O.Box 83                        tel.:   [phone]
 *  N-2007 Kjeller, Norway            fax.:   [phone]
 *  
 ************************************************************************/

#define sign(a)        ((a) < 0 ? -1 : 1)
#define Int(a)          ((a) < 0 ? (int)(a-0.5) : (int)(a))
#define mnint(a)	((a) < 0 ? (int)(a - 0.5) : (int)(a + 0.5))
#define mfloor(a)       ((a) < 0 ? (int)(a - 0.5) : (int)(a))
#define mmax(a, b)        ((a) > (b) ? (a) : (b))
#define mmin(a, b)        ((a) < (b) ? (a) : (b))
#define limit(x) \
{ \
    if (x > 255) x = 255; \
    if (x <   0)   x = 0; \
}