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revision 1.4, Sun Nov 17 00:57:57 2002 UTC revision 1.6.2.1, Mon Jun 9 01:18:23 2003 UTC
# Line 1  Line 1 
 /*****************************************************************************  
  *  
  *  XVID MPEG-4 VIDEO CODEC  
  *  - zigzag dct block scanning -  
  *  
  *  Copyright(C) 2001-2002 Michael Militzer <isibaar@xvid.org>  
  *  
  *  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.  
  *  
  * $Id$  
  *  
  ****************************************************************************/  
   
1  #ifndef _ZIGZAG_H_  #ifndef _ZIGZAG_H_
2  #define _ZIGZAG_H_  #define _ZIGZAG_H_
3    
4  static const uint16_t scan_tables[3][64] = {  static const uint16_t scan_tables[3][64] = {
5          {                                                       // zig_zag_scan          /* zig_zag_scan */
6           0, 1, 8, 16, 9, 2, 3, 10,          { 0,  1,  8, 16,  9,  2,  3, 10,
7           17, 24, 32, 25, 18, 11, 4, 5,           17, 24, 32, 25, 18, 11, 4, 5,
8           12, 19, 26, 33, 40, 48, 41, 34,           12, 19, 26, 33, 40, 48, 41, 34,
9           27, 20, 13, 6, 7, 14, 21, 28,           27, 20, 13, 6, 7, 14, 21, 28,
# Line 68  Line 12 
12           58, 59, 52, 45, 38, 31, 39, 46,           58, 59, 52, 45, 38, 31, 39, 46,
13           53, 60, 61, 54, 47, 55, 62, 63},           53, 60, 61, 54, 47, 55, 62, 63},
14    
15          {                                                       // horizontal_scan          /* horizontal_scan */
16           0, 1, 2, 3, 8, 9, 16, 17,          { 0,  1,  2,  3,  8,  9, 16, 17,
17           10, 11, 4, 5, 6, 7, 15, 14,           10, 11, 4, 5, 6, 7, 15, 14,
18           13, 12, 19, 18, 24, 25, 32, 33,           13, 12, 19, 18, 24, 25, 32, 33,
19           26, 27, 20, 21, 22, 23, 28, 29,           26, 27, 20, 21, 22, 23, 28, 29,
# Line 78  Line 22 
22           46, 47, 50, 51, 56, 57, 58, 59,           46, 47, 50, 51, 56, 57, 58, 59,
23           52, 53, 54, 55, 60, 61, 62, 63},           52, 53, 54, 55, 60, 61, 62, 63},
24    
25          {                                                       // vertical_scan          /* vertical_scan */
26           0, 8, 16, 24, 1, 9, 2, 10,          { 0,  8, 16, 24,  1,  9,  2, 10,
27           17, 25, 32, 40, 48, 56, 57, 49,           17, 25, 32, 40, 48, 56, 57, 49,
28           41, 33, 26, 18, 3, 11, 4, 12,           41, 33, 26, 18, 3, 11, 4, 12,
29           19, 27, 34, 42, 50, 58, 35, 43,           19, 27, 34, 42, 50, 58, 35, 43,
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