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1 : | edgomez | 467 | /***************************************************************************** |
2 : | * | ||
3 : | * XVID MPEG-4 VIDEO CODEC | ||
4 : | * - cbp function (zero block flags) - | ||
5 : | * | ||
6 : | edgomez | 468 | * Copyright (C) 2001-2002 - Edouard Gomez <ed.gomez@wanadoo.fr> |
7 : | edgomez | 467 | * |
8 : | * This program is an implementation of a part of one or more MPEG-4 | ||
9 : | * Video tools as specified in ISO/IEC 14496-2 standard. Those intending | ||
10 : | * to use this software module in hardware or software products are | ||
11 : | * advised that its use may infringe existing patents or copyrights, and | ||
12 : | * any such use would be at such party's own risk. The original | ||
13 : | * developer of this software module and his/her company, and subsequent | ||
14 : | * editors and their companies, will have no liability for use of this | ||
15 : | * software or modifications or derivatives thereof. | ||
16 : | * | ||
17 : | * This program is free software ; you can redistribute it and/or modify | ||
18 : | * it under the terms of the GNU General Public License as published by | ||
19 : | * the Free Software Foundation ; either version 2 of the License, or | ||
20 : | * (at your option) any later version. | ||
21 : | * | ||
22 : | * This program is distributed in the hope that it will be useful, | ||
23 : | * but WITHOUT ANY WARRANTY ; without even the implied warranty of | ||
24 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
25 : | * GNU General Public License for more details. | ||
26 : | * | ||
27 : | * You should have received a copy of the GNU General Public License | ||
28 : | * along with this program ; if not, write to the Free Software | ||
29 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
30 : | * | ||
31 : | edgomez | 468 | * $Id: cbp.c,v 1.7 2002-09-10 22:30:18 edgomez Exp $ |
32 : | edgomez | 467 | * |
33 : | ****************************************************************************/ | ||
34 : | |||
35 : | Isibaar | 3 | #include "../portab.h" |
36 : | #include "cbp.h" | ||
37 : | |||
38 : | edgomez | 467 | /***************************************************************************** |
39 : | * Global function pointer | ||
40 : | ****************************************************************************/ | ||
41 : | |||
42 : | Isibaar | 3 | cbpFuncPtr calc_cbp; |
43 : | |||
44 : | edgomez | 467 | /***************************************************************************** |
45 : | * Functions | ||
46 : | ****************************************************************************/ | ||
47 : | |||
48 : | edgomez | 46 | /* |
49 : | * Returns a field of bits that indicates non zero ac blocks | ||
50 : | * for this macro block | ||
51 : | */ | ||
52 : | edgomez | 195 | uint32_t |
53 : | calc_cbp_c(const int16_t codes[6 * 64]) | ||
54 : | Isibaar | 3 | { |
55 : | edgomez | 46 | uint32_t i, j; |
56 : | uint32_t cbp = 0; | ||
57 : | Isibaar | 3 | |
58 : | edgomez | 195 | for (i = 0; i < 6; i++) { |
59 : | for (j = 1; j < 61; j += 4) { | ||
60 : | if (codes[i * 64 + j] | codes[i * 64 + j + 1] | | ||
61 : | codes[i * 64 + j + 2] | codes[i * 64 + j + 3]) { | ||
62 : | Isibaar | 3 | cbp |= 1 << (5 - i); |
63 : | break; | ||
64 : | } | ||
65 : | } | ||
66 : | edgomez | 46 | |
67 : | edgomez | 195 | if (codes[i * 64 + j] | codes[i * 64 + j + 1] | codes[i * 64 + j + 2]) |
68 : | edgomez | 46 | cbp |= 1 << (5 - i); |
69 : | |||
70 : | } | ||
71 : | |||
72 : | return cbp; | ||
73 : | |||
74 : | Isibaar | 3 | } |
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