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Annotation of /xvidcore/src/quant/quant_matrix.c

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1 : edgomez 1.14 /*****************************************************************************
2 :     *
3 :     * XVID MPEG-4 VIDEO CODEC
4 :     * - Quantization matrix management code -
5 :     *
6 :     * Copyright(C) 2002 Michael Militzer <isibaar@xvid.org>
7 :     * 2002 Peter Ross <pross@xvid.org>
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 :     * $Id$
24 :     *
25 :     ****************************************************************************/
26 :    
27 : Isibaar 1.2 #include "quant_matrix.h"
28 : Isibaar 1.1
29 : edgomez 1.13 #define FIX(X) (((X)==1) ? 0xFFFF : ((1UL << 16) / (X) + 1))
30 :     #define FIXL(X) ((1UL << 16) / (X) - 1)
31 : edgomez 1.6
32 : edgomez 1.14 /*****************************************************************************
33 :     * Default matrices
34 :     ****************************************************************************/
35 : Isibaar 1.3
36 : edgomez 1.14 static const uint8_t default_intra_matrix[64] = {
37 :     8, 17, 18, 19, 21, 23, 25, 27,
38 : edgomez 1.5 17, 18, 19, 21, 23, 25, 27, 28,
39 :     20, 21, 22, 23, 24, 26, 28, 30,
40 :     21, 22, 23, 24, 26, 28, 30, 32,
41 :     22, 23, 24, 26, 28, 30, 32, 35,
42 :     23, 24, 26, 28, 30, 32, 35, 38,
43 :     25, 26, 28, 30, 32, 35, 38, 41,
44 :     27, 28, 30, 32, 35, 38, 41, 45
45 : Isibaar 1.3 };
46 : Isibaar 1.1
47 : edgomez 1.14 static const uint8_t default_inter_matrix[64] = {
48 : edgomez 1.5 16, 17, 18, 19, 20, 21, 22, 23,
49 :     17, 18, 19, 20, 21, 22, 23, 24,
50 :     18, 19, 20, 21, 22, 23, 24, 25,
51 :     19, 20, 21, 22, 23, 24, 26, 27,
52 :     20, 21, 22, 23, 25, 26, 27, 28,
53 :     21, 22, 23, 24, 26, 27, 28, 30,
54 :     22, 23, 24, 26, 27, 28, 30, 31,
55 :     23, 24, 25, 27, 28, 30, 31, 33
56 : Isibaar 1.3 };
57 :    
58 : edgomez 1.14 const uint16_t *
59 :     get_intra_matrix(const uint16_t * mpeg_quant_matrices)
60 : edgomez 1.5 {
61 : edgomez 1.14 return(mpeg_quant_matrices + 0*64);
62 : Isibaar 1.2 }
63 : Isibaar 1.1
64 : edgomez 1.14 const uint16_t *
65 :     get_inter_matrix(const uint16_t * mpeg_quant_matrices)
66 : edgomez 1.5 {
67 : edgomez 1.14 return(mpeg_quant_matrices + 4*64);
68 : Isibaar 1.2 }
69 :    
70 : edgomez 1.14 const uint8_t *
71 :     get_default_intra_matrix(void)
72 : edgomez 1.5 {
73 : edgomez 1.14 return default_intra_matrix;
74 : Isibaar 1.2 }
75 : Isibaar 1.1
76 : edgomez 1.14 const uint8_t *
77 :     get_default_inter_matrix(void)
78 : edgomez 1.5 {
79 : edgomez 1.14 return default_inter_matrix;
80 : Isibaar 1.2 }
81 : Isibaar 1.1
82 : edgomez 1.14 int
83 :     is_custom_intra_matrix(const uint16_t * mpeg_quant_matrices)
84 : edgomez 1.5 {
85 : edgomez 1.14 int i;
86 :     const uint16_t *intra_matrix = get_intra_matrix(mpeg_quant_matrices);
87 :     const uint8_t *def_intra_matrix = get_default_intra_matrix();
88 : Isibaar 1.1
89 : edgomez 1.14 for (i = 0; i < 64; i++) {
90 :     if(intra_matrix[i] != def_intra_matrix[i])
91 :     return 1;
92 :     }
93 :     return 0;
94 : Isibaar 1.4 }
95 :    
96 : edgomez 1.14 int
97 :     is_custom_inter_matrix(const uint16_t * mpeg_quant_matrices)
98 : edgomez 1.5 {
99 : edgomez 1.14 int i;
100 :     const uint16_t *inter_matrix = get_inter_matrix(mpeg_quant_matrices);
101 :     const uint8_t *def_inter_matrix = get_default_inter_matrix();
102 : Isibaar 1.3
103 : edgomez 1.14 for (i = 0; i < 64; i++) {
104 :     if(inter_matrix[i] != (uint16_t)def_inter_matrix[i])
105 :     return 1;
106 :     }
107 :     return 0;
108 : Isibaar 1.2 }
109 : Isibaar 1.1
110 : edgomez 1.14 void
111 :     set_intra_matrix(uint16_t * mpeg_quant_matrices, const uint8_t * matrix)
112 : Isibaar 1.1 {
113 : edgomez 1.14 int i;
114 :     uint16_t *intra_matrix = mpeg_quant_matrices + 0*64;
115 :     uint16_t *intra_matrix1 = mpeg_quant_matrices + 1*64;
116 :     uint16_t *intra_matrix_fix = mpeg_quant_matrices + 2*64;
117 :     uint16_t *intra_matrix_fixl = mpeg_quant_matrices + 3*64;
118 : Isibaar 1.2
119 : edgomez 1.5 for (i = 0; i < 64; i++) {
120 : edgomez 1.14 intra_matrix[i] = (!i) ? (uint16_t)8: (uint16_t)matrix[i];
121 :     intra_matrix1[i] = (intra_matrix[i]>>1);
122 : edgomez 1.13 intra_matrix1[i] += ((intra_matrix[i] == 1) ? 1: 0);
123 : Isibaar 1.2 intra_matrix_fix[i] = FIX(intra_matrix[i]);
124 : edgomez 1.13 intra_matrix_fixl[i] = FIXL(intra_matrix[i]);
125 : Isibaar 1.1 }
126 : Isibaar 1.2 }
127 : Isibaar 1.1
128 : edgomez 1.14 void
129 :     set_inter_matrix(uint16_t * mpeg_quant_matrices, const uint8_t * matrix)
130 : Isibaar 1.2 {
131 : edgomez 1.14 int i;
132 :     uint16_t *inter_matrix = mpeg_quant_matrices + 4*64;
133 :     uint16_t *inter_matrix1 = mpeg_quant_matrices + 5*64;
134 :     uint16_t *inter_matrix_fix = mpeg_quant_matrices + 6*64;
135 :     uint16_t *inter_matrix_fixl = mpeg_quant_matrices + 7*64;
136 : Isibaar 1.2
137 : edgomez 1.5 for (i = 0; i < 64; i++) {
138 : edgomez 1.13 inter_matrix1[i] = ((inter_matrix[i] = (int16_t) matrix[i])>>1);
139 :     inter_matrix1[i] += ((inter_matrix[i] == 1) ? 1: 0);
140 : Isibaar 1.2 inter_matrix_fix[i] = FIX(inter_matrix[i]);
141 : edgomez 1.13 inter_matrix_fixl[i] = FIXL(inter_matrix[i]);
142 : Isibaar 1.2 }
143 : edgomez 1.14 }
144 :    
145 :     void
146 :     init_mpeg_matrix(uint16_t * mpeg_quant_matrices) {
147 :    
148 :     set_intra_matrix(mpeg_quant_matrices, default_intra_matrix);
149 :     set_inter_matrix(mpeg_quant_matrices, default_inter_matrix);
150 : Isibaar 1.1 }

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