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Annotation of /xvidcore/src/bitstream/cbp.c

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Revision 1.9 - (view) (download)

1 : edgomez 1.6 /*****************************************************************************
2 :     *
3 :     * XVID MPEG-4 VIDEO CODEC
4 :     * - cbp function (zero block flags) -
5 :     *
6 : edgomez 1.9 * Copyright (C) 2001-2002 - Edouard Gomez <ed.gomez@free.fr>
7 : edgomez 1.6 *
8 : edgomez 1.8 * This file is part of XviD, a free MPEG-4 video encoder/decoder
9 :     *
10 :     * XviD is free software; you can redistribute it and/or modify it
11 :     * under the terms of the GNU General Public License as published by
12 :     * the Free Software Foundation; either version 2 of the License, or
13 : edgomez 1.6 * (at your option) any later version.
14 :     *
15 :     * This program is distributed in the hope that it will be useful,
16 : edgomez 1.8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 : edgomez 1.6 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 :     * GNU General Public License for more details.
19 :     *
20 :     * You should have received a copy of the GNU General Public License
21 : edgomez 1.8 * along with this program; if not, write to the Free Software
22 : edgomez 1.6 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 :     *
24 : edgomez 1.8 * Under section 8 of the GNU General Public License, the copyright
25 :     * holders of XVID explicitly forbid distribution in the following
26 :     * countries:
27 :     *
28 :     * - Japan
29 :     * - United States of America
30 :     *
31 :     * Linking XviD statically or dynamically with other modules is making a
32 :     * combined work based on XviD. Thus, the terms and conditions of the
33 :     * GNU General Public License cover the whole combination.
34 :     *
35 :     * As a special exception, the copyright holders of XviD give you
36 :     * permission to link XviD with independent modules that communicate with
37 :     * XviD solely through the VFW1.1 and DShow interfaces, regardless of the
38 :     * license terms of these independent modules, and to copy and distribute
39 :     * the resulting combined work under terms of your choice, provided that
40 :     * every copy of the combined work is accompanied by a complete copy of
41 :     * the source code of XviD (the version of XviD used to produce the
42 :     * combined work), being distributed under the terms of the GNU General
43 :     * Public License plus this exception. An independent module is a module
44 :     * which is not derived from or based on XviD.
45 :     *
46 :     * Note that people who make modified versions of XviD are not obligated
47 :     * to grant this special exception for their modified versions; it is
48 :     * their choice whether to do so. The GNU General Public License gives
49 :     * permission to release a modified version without this exception; this
50 :     * exception also makes it possible to release a modified version which
51 :     * carries forward this exception.
52 :     *
53 : edgomez 1.9 * $Id: cbp.c,v 1.8 2002/11/17 00:57:57 edgomez Exp $
54 : edgomez 1.6 *
55 :     ****************************************************************************/
56 :    
57 : Isibaar 1.1 #include "../portab.h"
58 :     #include "cbp.h"
59 :    
60 : edgomez 1.6 /*****************************************************************************
61 :     * Global function pointer
62 :     ****************************************************************************/
63 :    
64 : Isibaar 1.1 cbpFuncPtr calc_cbp;
65 : edgomez 1.6
66 :     /*****************************************************************************
67 :     * Functions
68 :     ****************************************************************************/
69 : Isibaar 1.1
70 : edgomez 1.2 /*
71 :     * Returns a field of bits that indicates non zero ac blocks
72 :     * for this macro block
73 :     */
74 : edgomez 1.5 uint32_t
75 :     calc_cbp_c(const int16_t codes[6 * 64])
76 : Isibaar 1.1 {
77 : edgomez 1.2 uint32_t i, j;
78 :     uint32_t cbp = 0;
79 : Isibaar 1.1
80 : edgomez 1.5 for (i = 0; i < 6; i++) {
81 :     for (j = 1; j < 61; j += 4) {
82 :     if (codes[i * 64 + j] | codes[i * 64 + j + 1] |
83 :     codes[i * 64 + j + 2] | codes[i * 64 + j + 3]) {
84 : Isibaar 1.1 cbp |= 1 << (5 - i);
85 :     break;
86 :     }
87 :     }
88 : edgomez 1.2
89 : edgomez 1.5 if (codes[i * 64 + j] | codes[i * 64 + j + 1] | codes[i * 64 + j + 2])
90 : edgomez 1.2 cbp |= 1 << (5 - i);
91 :    
92 :     }
93 :    
94 :     return cbp;
95 :    
96 : Isibaar 1.1 }

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