1 |
/***************************************************************************** |
/* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */ |
2 |
* |
|
3 |
* XVID MPEG-4 VIDEO CODEC |
/* |
4 |
* - fast disrete cosine transformation - integer C version |
* Disclaimer of Warranty |
|
* |
|
|
* These routines are from Independent JPEG Group's free JPEG software |
|
|
* Copyright (C) 1991-1998, Thomas G. Lane (see the file README.IJG) |
|
|
* |
|
|
* This file is part of XviD, a free MPEG-4 video encoder/decoder |
|
|
* |
|
|
* XviD 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
|
|
* |
|
|
* Under section 8 of the GNU General Public License, the copyright |
|
|
* holders of XVID explicitly forbid distribution in the following |
|
|
* countries: |
|
|
* |
|
|
* - Japan |
|
|
* - United States of America |
|
|
* |
|
|
* Linking XviD statically or dynamically with other modules is making a |
|
|
* combined work based on XviD. Thus, the terms and conditions of the |
|
|
* GNU General Public License cover the whole combination. |
|
|
* |
|
|
* As a special exception, the copyright holders of XviD give you |
|
|
* permission to link XviD with independent modules that communicate with |
|
|
* XviD solely through the VFW1.1 and DShow interfaces, regardless of the |
|
|
* license terms of these independent modules, and to copy and distribute |
|
|
* the resulting combined work under terms of your choice, provided that |
|
|
* every copy of the combined work is accompanied by a complete copy of |
|
|
* the source code of XviD (the version of XviD used to produce the |
|
|
* combined work), being distributed under the terms of the GNU General |
|
|
* Public License plus this exception. An independent module is a module |
|
|
* which is not derived from or based on XviD. |
|
|
* |
|
|
* Note that people who make modified versions of XviD are not obligated |
|
|
* to grant this special exception for their modified versions; it is |
|
|
* their choice whether to do so. The GNU General Public License gives |
|
|
* permission to release a modified version without this exception; this |
|
|
* exception also makes it possible to release a modified version which |
|
|
* carries forward this exception. |
|
5 |
* |
* |
6 |
* $Id: fdct.c,v 1.5 2002-11-26 23:44:10 edgomez Exp $ |
* These software programs are available to the user without any license fee or |
7 |
|
* royalty on an "as is" basis. The MPEG Software Simulation Group disclaims |
8 |
|
* any and all warranties, whether express, implied, or statuary, including any |
9 |
|
* implied warranties or merchantability or of fitness for a particular |
10 |
|
* purpose. In no event shall the copyright-holder be liable for any |
11 |
|
* incidental, punitive, or consequential damages of any kind whatsoever |
12 |
|
* arising from the use of these programs. |
13 |
|
* |
14 |
|
* This disclaimer of warranty extends to the user of these programs and user's |
15 |
|
* customers, employees, agents, transferees, successors, and assigns. |
16 |
|
* |
17 |
|
* The MPEG Software Simulation Group does not represent or warrant that the |
18 |
|
* programs furnished hereunder are free of infringement of any third-party |
19 |
|
* patents. |
20 |
|
* |
21 |
|
* Commercial implementations of MPEG-1 and MPEG-2 video, including shareware, |
22 |
|
* are subject to royalty fees to patent holders. Many of these patents are |
23 |
|
* general enough such that they are unavoidable regardless of implementation |
24 |
|
* design. |
25 |
* |
* |
26 |
*************************************************************************/ |
*/ |
27 |
|
|
28 |
/* This routine is a slow-but-accurate integer implementation of the |
/* This routine is a slow-but-accurate integer implementation of the |
29 |
* forward DCT (Discrete Cosine Transform). Taken from the IJG software |
* forward DCT (Discrete Cosine Transform). Taken from the IJG software |
108 |
#define FIX_2_562915447 ((int) 20995) /* FIX(2.562915447) */ |
#define FIX_2_562915447 ((int) 20995) /* FIX(2.562915447) */ |
109 |
#define FIX_3_072711026 ((int) 25172) /* FIX(3.072711026) */ |
#define FIX_3_072711026 ((int) 25172) /* FIX(3.072711026) */ |
110 |
|
|
111 |
/* function pointer */ |
// function pointer |
112 |
fdctFuncPtr fdct; |
fdctFuncPtr fdct; |
113 |
|
|
114 |
/* |
/* |