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1 : | edgomez | 1054 | /***************************************************************************** |
2 : | * | ||
3 : | * XVID MPEG-4 VIDEO CODEC | ||
4 : | * - CBP related function - | ||
5 : | * | ||
6 : | * Copyright(C) 2002-2003 Edouard Gomez <ed.gomez@free.fr> | ||
7 : | * 2003 Christoph Lampert <gruel@web.de> | ||
8 : | * | ||
9 : | * This program is free software ; you can redistribute it and/or modify | ||
10 : | * it under the terms of the GNU General Public License as published by | ||
11 : | * the Free Software Foundation ; either version 2 of the License, or | ||
12 : | * (at your option) any later version. | ||
13 : | * | ||
14 : | * This program is distributed in the hope that it will be useful, | ||
15 : | * but WITHOUT ANY WARRANTY ; without even the implied warranty of | ||
16 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
17 : | * GNU General Public License for more details. | ||
18 : | * | ||
19 : | * You should have received a copy of the GNU General Public License | ||
20 : | * along with this program ; if not, write to the Free Software | ||
21 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
22 : | * | ||
23 : | * $Id: cbp.c,v 1.10.2.2 2003-06-09 13:51:56 edgomez Exp $ | ||
24 : | * | ||
25 : | ****************************************************************************/ | ||
26 : | |||
27 : | Isibaar | 3 | #include "../portab.h" |
28 : | #include "cbp.h" | ||
29 : | |||
30 : | cbpFuncPtr calc_cbp; | ||
31 : | |||
32 : | edgomez | 46 | /* |
33 : | * Returns a field of bits that indicates non zero ac blocks | ||
34 : | * for this macro block | ||
35 : | */ | ||
36 : | edgomez | 952 | |
37 : | /* naive C */ | ||
38 : | edgomez | 195 | uint32_t |
39 : | edgomez | 952 | calc_cbp_plain(const int16_t codes[6 * 64]) |
40 : | Isibaar | 3 | { |
41 : | edgomez | 952 | int i, j; |
42 : | edgomez | 46 | uint32_t cbp = 0; |
43 : | Isibaar | 3 | |
44 : | edgomez | 195 | for (i = 0; i < 6; i++) { |
45 : | edgomez | 952 | for (j=1; j<64;j++) { |
46 : | if (codes[64*i+j]) { | ||
47 : | cbp |= 1 << (5-i); | ||
48 : | Isibaar | 3 | break; |
49 : | } | ||
50 : | } | ||
51 : | edgomez | 952 | } |
52 : | return cbp; | ||
53 : | } | ||
54 : | edgomez | 46 | |
55 : | edgomez | 952 | /* optimized C */ |
56 : | uint32_t | ||
57 : | calc_cbp_c(const int16_t codes[6 * 64]) | ||
58 : | { | ||
59 : | unsigned int i=6; | ||
60 : | uint32_t cbp = 0; | ||
61 : | edgomez | 46 | |
62 : | edgomez | 952 | /* uses fixed relation: 4*codes = 1*codes64 */ |
63 : | /* if prototype is changed (e.g. from int16_t to something like int32) this routine | ||
64 : | has to be changed! */ | ||
65 : | |||
66 : | do { | ||
67 : | uint64_t *codes64 = (uint64_t*)codes; /* the compiler doesn't really make this */ | ||
68 : | uint32_t *codes32 = (uint32_t*)codes; /* variables, just "addressing modes" */ | ||
69 : | |||
70 : | cbp += cbp; | ||
71 : | if (codes[1] || codes32[1]) { | ||
72 : | cbp++; | ||
73 : | } | ||
74 : | else if (codes64[1] | codes64[2] | codes64[3]) { | ||
75 : | cbp++; | ||
76 : | } | ||
77 : | else if (codes64[4] | codes64[5] | codes64[6] | codes64[7]) { | ||
78 : | cbp++; | ||
79 : | } | ||
80 : | else if (codes64[8] | codes64[9] | codes64[10] | codes64[11]) { | ||
81 : | cbp++; | ||
82 : | } | ||
83 : | else if (codes64[12] | codes64[13] | codes64[14] | codes64[15]) { | ||
84 : | cbp++; | ||
85 : | } | ||
86 : | codes += 64; | ||
87 : | i--; | ||
88 : | } while (i != 0); | ||
89 : | |||
90 : | return cbp; | ||
91 : | } | ||
92 : | |||
93 : | |||
94 : | |||
95 : | |||
96 : | /* older code maybe better on some plattforms? */ | ||
97 : | #if 0 | ||
98 : | for (i = 5; i >= 0; i--) { | ||
99 : | if (codes[1] | codes[2] | codes[3]) | ||
100 : | cbp |= 1 << i; | ||
101 : | else { | ||
102 : | for (j = 4; j <= 56; j+=4) /* [60],[61],[62],[63] are last */ | ||
103 : | if (codes[j] | codes[j+1] | codes[j+2] | codes[j+3]) { | ||
104 : | cbp |= 1 << i; | ||
105 : | break; | ||
106 : | } | ||
107 : | } | ||
108 : | codes += 64; | ||
109 : | edgomez | 46 | } |
110 : | |||
111 : | return cbp; | ||
112 : | edgomez | 952 | #endif |
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