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revision 1.3, Tue Sep 10 22:54:23 2002 UTC revision 1.6.2.2, Mon Jun 9 13:52:34 2003 UTC
# Line 1  Line 1 
1  /*****************************************************************************  /*****************************************************************************
2   *   *
3   *  XVID MPEG-4 VIDEO CODEC   *  XVID MPEG-4 VIDEO CODEC
4   *  - zigzag dct block scanning -   *  - ZigZag order matrices  -
5   *   *
6   *  Copyright(C) 2001-2002 Michael Militzer <isibaar@xvid.org>   *  Copyright(C) 2001-2002 Michael Militzer <isibaar@xvid.org>
7   *   *
  *  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.  
  *  
8   *  This program is free software ; you can redistribute it and/or modify   *  This program is free software ; you can redistribute it and/or modify
9   *  it under the terms of the GNU General Public License as published by   *  it under the terms of the GNU General Public License as published by
10   *  the Free Software Foundation ; either version 2 of the License, or   *  the Free Software Foundation ; either version 2 of the License, or
# Line 36  Line 27 
27  #define _ZIGZAG_H_  #define _ZIGZAG_H_
28    
29  static const uint16_t scan_tables[3][64] = {  static const uint16_t scan_tables[3][64] = {
30          {                                                       // zig_zag_scan          /* zig_zag_scan */
31           0, 1, 8, 16, 9, 2, 3, 10,          { 0,  1,  8, 16,  9,  2,  3, 10,
32           17, 24, 32, 25, 18, 11, 4, 5,           17, 24, 32, 25, 18, 11, 4, 5,
33           12, 19, 26, 33, 40, 48, 41, 34,           12, 19, 26, 33, 40, 48, 41, 34,
34           27, 20, 13, 6, 7, 14, 21, 28,           27, 20, 13, 6, 7, 14, 21, 28,
# Line 46  Line 37 
37           58, 59, 52, 45, 38, 31, 39, 46,           58, 59, 52, 45, 38, 31, 39, 46,
38           53, 60, 61, 54, 47, 55, 62, 63},           53, 60, 61, 54, 47, 55, 62, 63},
39    
40          {                                                       // horizontal_scan          /* horizontal_scan */
41           0, 1, 2, 3, 8, 9, 16, 17,          { 0,  1,  2,  3,  8,  9, 16, 17,
42           10, 11, 4, 5, 6, 7, 15, 14,           10, 11, 4, 5, 6, 7, 15, 14,
43           13, 12, 19, 18, 24, 25, 32, 33,           13, 12, 19, 18, 24, 25, 32, 33,
44           26, 27, 20, 21, 22, 23, 28, 29,           26, 27, 20, 21, 22, 23, 28, 29,
# Line 56  Line 47 
47           46, 47, 50, 51, 56, 57, 58, 59,           46, 47, 50, 51, 56, 57, 58, 59,
48           52, 53, 54, 55, 60, 61, 62, 63},           52, 53, 54, 55, 60, 61, 62, 63},
49    
50          {                                                       // vertical_scan          /* vertical_scan */
51           0, 8, 16, 24, 1, 9, 2, 10,          { 0,  8, 16, 24,  1,  9,  2, 10,
52           17, 25, 32, 40, 48, 56, 57, 49,           17, 25, 32, 40, 48, 56, 57, 49,
53           41, 33, 26, 18, 3, 11, 4, 12,           41, 33, 26, 18, 3, 11, 4, 12,
54           19, 27, 34, 42, 50, 58, 35, 43,           19, 27, 34, 42, 50, 58, 35, 43,
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