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/***************************************************************************** |
/***************************************************************************** |
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* |
* |
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* XVID MPEG-4 VIDEO CODEC |
* XVID MPEG-4 VIDEO CODEC |
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* - zigzag dct block scanning - |
* - ZigZag order matrices - |
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* |
* |
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* Copyright(C) 2001-2002 Michael Militzer <isibaar@xvid.org> |
* Copyright(C) 2001-2002 Michael Militzer <isibaar@xvid.org> |
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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 program is free software ; you can redistribute it and/or modify |
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* 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 |
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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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* 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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* $Id: zigzag.h,v 1.3 2002-09-10 22:54:23 edgomez Exp $ |
* $Id: zigzag.h,v 1.7 2004-03-22 22:36:23 edgomez Exp $ |
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* |
* |
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****************************************************************************/ |
****************************************************************************/ |
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#define _ZIGZAG_H_ |
#define _ZIGZAG_H_ |
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static const uint16_t scan_tables[3][64] = { |
static const uint16_t scan_tables[3][64] = { |
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{ // zig_zag_scan |
/* zig_zag_scan */ |
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0, 1, 8, 16, 9, 2, 3, 10, |
{ 0, 1, 8, 16, 9, 2, 3, 10, |
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17, 24, 32, 25, 18, 11, 4, 5, |
17, 24, 32, 25, 18, 11, 4, 5, |
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12, 19, 26, 33, 40, 48, 41, 34, |
12, 19, 26, 33, 40, 48, 41, 34, |
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27, 20, 13, 6, 7, 14, 21, 28, |
27, 20, 13, 6, 7, 14, 21, 28, |
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58, 59, 52, 45, 38, 31, 39, 46, |
58, 59, 52, 45, 38, 31, 39, 46, |
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53, 60, 61, 54, 47, 55, 62, 63}, |
53, 60, 61, 54, 47, 55, 62, 63}, |
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{ // horizontal_scan |
/* horizontal_scan */ |
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0, 1, 2, 3, 8, 9, 16, 17, |
{ 0, 1, 2, 3, 8, 9, 16, 17, |
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10, 11, 4, 5, 6, 7, 15, 14, |
10, 11, 4, 5, 6, 7, 15, 14, |
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13, 12, 19, 18, 24, 25, 32, 33, |
13, 12, 19, 18, 24, 25, 32, 33, |
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26, 27, 20, 21, 22, 23, 28, 29, |
26, 27, 20, 21, 22, 23, 28, 29, |
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46, 47, 50, 51, 56, 57, 58, 59, |
46, 47, 50, 51, 56, 57, 58, 59, |
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52, 53, 54, 55, 60, 61, 62, 63}, |
52, 53, 54, 55, 60, 61, 62, 63}, |
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{ // vertical_scan |
/* vertical_scan */ |
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0, 8, 16, 24, 1, 9, 2, 10, |
{ 0, 8, 16, 24, 1, 9, 2, 10, |
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17, 25, 32, 40, 48, 56, 57, 49, |
17, 25, 32, 40, 48, 56, 57, 49, |
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41, 33, 26, 18, 3, 11, 4, 12, |
41, 33, 26, 18, 3, 11, 4, 12, |
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19, 27, 34, 42, 50, 58, 35, 43, |
19, 27, 34, 42, 50, 58, 35, 43, |