FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/siren.c
Date: 2025-07-11 09:13:03
Exec Total Coverage
Lines: 226 282 80.1%
Functions: 7 8 87.5%
Branches: 128 178 71.9%
Line Branch Exec Source
1 /*
2 * Siren audio decoder
3 * Copyright (c) 2012 Youness Alaoui <kakaroto@kakaroto.homelinux.net>
4 * Copyright (c) 2018 Paul B Mahol
5 * Copyright (c) 2019 Lynne <dev@lynne.ee>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg 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 GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #include "libavutil/channel_layout.h"
25 #include "libavutil/mem.h"
26 #include "libavutil/tx.h"
27 #include "libavutil/float_dsp.h"
28 #include "libavutil/mem_internal.h"
29
30 #include "avcodec.h"
31 #include "codec_internal.h"
32 #include "decode.h"
33 #include "get_bits.h"
34
35 static const uint8_t index_table[8] = {4, 4, 3, 3, 2, 2, 1, 0};
36 static const uint8_t vector_dimension[8] = { 2, 2, 2, 4, 4, 5, 5, 1 };
37 static const uint8_t number_of_vectors[8] = { 10, 10, 10, 5, 5, 4, 4, 20 };
38 static const uint8_t expected_bits_table[8] = { 52, 47, 43, 37, 29, 22, 16, 0 };
39 static const int8_t differential_decoder_tree[27][24][2] = {
40 {
41 {1, 2}, {3, 4}, {5, 6}, {7, 8}, {9, 10}, {11, -12}, {-11, -10}, {-8, -9}, {-7, -6}, {-13, 12},
42 {-5, -4}, {0, 13}, {-3, -14}, {-2, 14}, {-1, 15}, {-15, 16}, {-16, 17}, {-17, 18}, {19, 20},
43 {21, 22}, {-18, -19}, {-20, -21}, {-22, -23}, {-32, -32}
44 },
45 {
46 {1, 2}, {3, 4}, {5, 6}, {7, 8}, {-10, -9}, {-8, -11}, {-7, -6}, {9, -5}, {10, -12}, {-4, 11},
47 {-13, -3}, {12, -2}, {13, -14}, {-1, 14}, {15, -15}, {0, 16}, {-16, 17}, {-17, 18}, {-18, 19},
48 {20, 21},{22, -19}, {-20, -21}, {-22, -23}, {-32, -32}
49 },
50 {
51 {1, 2}, {3, 4}, {5, 6}, {7, 8}, {9, 10}, {-12, 11}, {-11, -13}, {-10, -9}, {12, -14}, {-8, -7},
52 {-15, -6}, {13, -5}, {-16, -4}, {14, -17}, {15, -3}, {16, -18}, {-2, 17}, {18, -19}, {-1, 19},
53 {-20, 20}, {0, 21}, {22, -21}, {-22, -23}, {-32, -32}
54 },
55 {
56 {1, 2}, {3, 4}, {5, 6}, {-11, -10}, {7, -12}, {8, -9}, {9, -13}, {-14, 10}, {-8, -15}, {-16, 11},
57 {-7, 12}, {-17, -6}, {13, 14}, {-18, 15}, {-5, -4}, {16, 17}, {-3, -2}, {-19, 18}, {-1, 19},
58 {-20, 20}, {21, 22}, {0, -21}, {-22, -23}, {-32, -32}
59 },
60 {
61 {1, 2}, {3, 4}, {5, 6}, {-12, -11}, {-13, 7}, {8, -14}, {-10, 9}, {10, -15}, {-9, 11}, {-8, 12},
62 {-16, 13}, {-7, -6}, {-17, 14}, {-5, -18}, {15, -4}, {16, -19}, {17, -3}, {-20, 18}, {-2, 19},
63 {-21, 20}, {0, 21}, {22, -1}, {-22, -23}, {-32, -32}
64 },
65 {
66 {1, 2}, {3, 4}, {5, 6}, {-11, 7}, {-12, -10}, {-13, -9}, {8, 9}, {-14, -8}, {10, -15}, {-7, 11},
67 {-16, 12}, {-6, -17}, {13, 14}, {-5, 15}, {-18, 16}, {-4, 17}, {-3, -19}, {18, -2}, {-20, 19},
68 {-1, 20}, {0, 21}, {22, -21}, {-22, -23}, {-32, -32}
69 },
70 {
71 {1, 2}, {3, 4}, {5, -12}, {6, -11}, {-10, -13}, {-9, 7}, {8, -14}, {9, -8}, {-15, 10}, {-7, -16},
72 {11, -6}, {12, -17}, {13, -5}, {-18, 14}, {15, -4}, {-19, 16}, {17, -3}, {-20, 18}, {19, 20},
73 {21, 22}, {0, -2}, {-1, -21}, {-22, -23}, {-32, -32}
74 },
75 {
76 {1, 2}, {3, 4}, {5, -12}, {6, -13}, {-11, -10}, {7, -14}, {8, -9}, {9, -15}, {-8, 10}, {-7, -16},
77 {11, 12}, {-6, -17}, {-5, 13}, {14, 15}, {-18, -4}, {-19, 16}, {-3, 17}, {18, -2}, {-20, 19},
78 {20, 21}, {22, 0}, {-1, -21}, {-22, -23}, {-32, -32}
79 },
80 {
81 {1, 2}, {3, 4}, {5, 6}, {-11, -10}, {-12, -9}, {7, 8}, {-13, -8}, {9, -14}, {-7, 10}, {-6, -15},
82 {11, 12}, {-5, -16}, {13, 14}, {-17, 15}, {-4, 16}, {17, -18}, {18, -3}, {-2, 19}, {-1, 0},
83 {-19, 20}, {-20, 21}, {22, -21}, {-22, -23}, {-32, -32}
84 },
85 {
86 {1, 2}, {3, 4}, {5, 6}, {-11, 7}, {-10, -12}, {-9, 8}, {-8, -13}, {9, -7}, {10, -14}, {-6, 11},
87 {-15, 12}, {-5, 13}, {-16, -4}, {14, 15}, {-17, -3}, {-18, 16}, {17, -19}, {-2, 18}, {-20, 19},
88 {-1, 20}, {21, 22}, {0, -21}, {-22, -23}, {-32, -32}
89 },
90 {
91 {1, 2}, {3, 4}, {5, -12}, {6, -11}, {7, 8}, {-10, -13}, {-9, 9}, {-8, -14}, {10, -7}, {11, -15},
92 {-6, 12}, {-5, 13}, {-4, -16}, {14, 15}, {-3, -17}, {16, 17}, {-18, -2}, {18, -19}, {-1, 19},
93 {-20, 20}, {-21, 21}, {22, 0}, {-22, -23}, {-32, -32}
94 },
95 {
96 {1, 2}, {3, 4}, {5, -12}, {-13, 6}, {-11, 7}, {-14, 8}, {-10, 9}, {-15, -9}, {-8, 10}, {-7, -16},
97 {11, -6}, {12, -5}, {-17, 13}, {14, -18}, {15, -4}, {16, -19}, {17, -3}, {18, -2}, {19, -1},
98 {-20, 20}, {21, 22}, {0, -21}, {-22, -23}, {-32, -32}
99 },
100 {
101 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
102 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
103 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
104 },
105 {
106 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
107 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
108 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
109 },
110 {
111 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
112 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
113 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
114 },
115 {
116 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
117 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
118 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
119 },
120 {
121 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
122 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
123 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
124 },
125 {
126 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
127 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
128 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
129 },
130 {
131 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
132 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
133 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
134 },
135 {
136 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
137 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
138 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
139 },
140 {
141 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
142 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
143 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
144 },
145 {
146 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
147 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
148 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
149 },
150 {
151 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
152 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
153 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
154 },
155 {
156 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
157 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
158 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
159 },
160 {
161 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
162 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
163 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
164 },
165 {
166 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
167 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
168 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
169 },
170 {
171 {1, 2}, {3, 4}, {-12, 5}, {-11, -13}, {6, -14}, {-10, 7}, {8, -15}, {-9, 9}, {-16, 10}, {-8, -17},
172 {11, 12}, {-7, -18}, {-6, 13}, {14, -5}, {15, -19}, {-4, 16}, {-20, 17}, {18, 19}, {20, 21},
173 {22, 0}, {-1, -3}, {-2, -21}, {-22, -23}, {-32, -32}
174 },
175 };
176
177 static const uint16_t decoder_tree0[360] = {
178 2, 1, 4, 6, 8, 10, 12, 14, 16, 18, 33, 3, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 35, 40,
179 42, 44, 46, 5, 48, 65, 50, 52, 54, 56, 58, 60, 62, 64, 37, 66, 67, 68, 97, 70, 72, 74, 7,
180 76, 78, 80, 82, 84, 86, 88, 99, 90, 39, 92, 94, 96, 129, 98, 9, 100, 102, 104, 106, 108,
181 110, 112, 41, 161, 69, 114, 116, 118, 131, 120, 122, 11, 124, 126, 128, 193, 130, 132, 71,
182 134, 43, 136, 138, 140, 163, 101, 13, 142, 144, 146, 148, 150, 152, 154, 225, 156, 158, 195,
183 160, 162, 45, 164, 15, 166, 73, 168, 170, 133, 47, 172, 257, 174, 176, 178, 75, 103, 180, 165,
184 182, 17, 227, 184, 105, 49, 135, 186, 289, 188, 259, 190, 192, 194, 196, 198, 291, 77, 200,
185 202, 197, 107, 204, 19, 51, 229, 206, 167, 208, 210, 212, 214, 21, 79, 81, 109, 216, 218, 220,
186 222, 53, 137, 224, 199, 226, 323, 321, 169, 228, 111, 230, 232, 139, 261, 234, 83, 236, 201,
187 238, 240, 293, 242, 353, 231, 141, 244, 246, 113, 23, 355, 85, 248, 55, 115, 250, 263, 252,
188 254, 203, 171, 256, 258, 233, 235, 143, 357, 325, 260, 295, 262, 173, 145, 177, 87, 264, 327,
189 267, 266, 268, 175, 270, 272, 117, 297, 274, 265, 147, 179, 205, 276, 207, 237, 269, 278, 57,
190 59, 387, 209, 280, 282, 149, 329, 385, 284, 25, 286, 239, 119, 288, 27, 290, 292, 299, 294, 359,
191 89, 296, 298, 419, 181, 300, 331, 271, 417, 211, 361, 151, 389, 241, 302, 304, 303, 306, 308,
192 421, 91, 310, 312, 391, 314, 121, 316, 333, 318, 275, 213, 301, 243, 183, 335, 320, 363, 322,
193 215, 324, 393, 273, 337, 153, 326, 423, 365, 328, 367, 247, 395, 185, 123, 330, 425, 245, 155,
194 332, 334, 305, 397, 336, 277, 217, 338, 340, 339, 427, 342, 344, 346, 307, 399, 187, 348, 309,
195 341, 350, 369, 279, 311, 429, 249, 219, 352, 354, 356, 358, 431, 373, 401, 371, 313, 281, 433,
196 343, 403, 251, 283
197 };
198
199 static const uint16_t decoder_tree1[188] = {
200 2, 1, 4, 6, 8, 10, 12, 14, 16, 3, 33, 18, 20, 22, 24, 26, 35, 28, 30, 32, 34, 36, 5, 65, 38, 40,
201 37, 42, 44, 46, 67, 48, 50, 52, 54, 56, 58, 60, 7, 62, 39, 97, 64, 69, 66, 99, 68, 70, 72, 74, 76,
202 78, 80, 129, 41, 131, 82, 9, 71, 84, 86, 101, 88, 90, 92, 94, 96, 161, 43, 11, 73, 98, 103, 100,
203 163, 102, 104, 106, 108, 133, 110, 105, 112, 75, 114, 45, 13, 116, 165, 118, 195, 135, 193, 120, 77,
204 122, 47, 124, 167, 225, 126, 79, 107, 227, 128, 137, 197, 15, 130, 169, 199, 132, 109, 134, 17, 139,
205 49, 136, 229, 138, 140, 81, 259, 142, 144, 171, 146, 141, 148, 111, 150, 201, 231, 152, 51, 257, 289,
206 154, 19, 113, 156, 261, 158, 203, 173, 263, 143, 160, 291, 235, 83, 162, 233, 265, 164, 205, 166, 293,
207 145, 168, 175, 177, 237, 115, 295, 170, 207, 172, 267, 174, 176, 297, 147, 178, 180, 269, 182, 271,
208 209, 299, 239, 179, 184, 301, 241, 211, 0, 0
209 };
210
211 static const uint16_t decoder_tree2[96] = {
212 2, 1, 4, 6, 8, 10, 12, 3, 17, 14, 19, 16, 18, 20, 22, 24, 26, 5, 21, 35, 33, 28, 30, 32, 34, 36, 38, 37,
213 40, 23, 51, 42, 7, 49, 44, 46, 48, 50, 39, 53, 52, 54, 56, 25, 67, 9, 58, 60, 65, 55, 41, 62, 64, 69, 66,
214 11, 27, 68, 57, 83, 70, 71, 81, 43, 72, 74, 13, 76, 85, 29, 73, 78, 99, 59, 87, 101, 80, 97, 45, 82, 84,
215 75, 89, 61, 86, 103, 88, 77, 90, 105, 91, 92, 107, 93, 0, 0
216 };
217
218 static const uint16_t decoder_tree3[1040] = {
219 2, 4, 6, 8, 10, 1, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 3, 36, 1025, 38, 40, 42, 44, 46, 48, 50,
220 129, 17, 52, 54, 1153, 19, 56, 58, 60, 62, 64, 66, 68, 145, 70, 72, 74, 76, 78, 1169, 1027, 147, 80, 82, 1171,
221 84, 86, 131, 88, 1155, 1043, 1041, 90, 92, 5, 94, 96, 98, 100, 102, 104, 21, 106, 108, 2049, 2177, 110, 112, 114,
222 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 33, 144, 163, 146, 148, 150, 152, 154, 161,
223 156, 35, 158, 1297, 160, 162, 273, 257, 164, 166, 149, 168, 1281, 170, 172, 2193, 174, 176, 178, 1299, 180, 1045,
224 182, 184, 1173, 186, 3201, 188, 190, 192, 194, 2195, 1187, 23, 2179, 196, 7, 198, 275, 200, 2051, 202, 2065, 204,
225 206, 1029, 1185, 208, 210, 1157, 37, 3073, 2067, 133, 212, 214, 2321, 216, 165, 218, 1059, 220, 1283, 222, 2305,
226 224, 226, 228, 230, 259, 232, 234, 2323, 236, 1409, 1057, 1315, 238, 240, 242, 244, 246, 1425, 248, 1313, 250, 252,
227 254, 256, 258, 260, 289, 262, 264, 1189, 266, 268, 179, 151, 270, 272, 274, 276, 278, 291, 280, 282, 9, 385, 284,
228 286, 177, 49, 401, 1061, 288, 290, 292, 51, 294, 296, 298, 300, 302, 304, 25, 306, 2083, 39, 308, 310, 3329, 167,
229 312, 314, 1175, 316, 318, 1203, 135, 320, 322, 324, 326, 328, 2211, 2307, 330, 1301, 332, 334, 1047, 336, 338, 2449,
230 3217, 340, 1427, 2209, 53, 342, 2339, 3345, 344, 346, 348, 403, 181, 4097, 2197, 350, 2181, 1285, 1317, 1031, 352,
231 354, 356, 3089, 358, 360, 4225, 277, 362, 364, 366, 368, 2069, 370, 3203, 293, 1201, 305, 372, 3219, 307, 2433, 374,
232 376, 378, 380, 2081, 1411, 382, 384, 3075, 1443, 513, 386, 387, 388, 390, 1331, 261, 392, 394, 396, 398, 400, 1441,
233 1075, 67, 1159, 402, 404, 406, 408, 410, 412, 414, 3347, 2325, 416, 65, 418, 420, 422, 424, 426, 2053, 193, 1073, 428,
234 430, 432, 1537, 1329, 2337, 2213, 434, 417, 183, 41, 436, 438, 440, 442, 444, 446, 448, 450, 195, 2435, 452, 2085, 1063,
235 1191, 454, 456, 458, 460, 419, 2071, 1553, 3091, 55, 137, 462, 464, 466, 468, 470, 472, 474, 476, 478, 2309, 4113, 480,
236 482, 484, 486, 2451, 2465, 1205, 153, 488, 490, 492, 494, 496, 498, 500, 502, 504, 506, 508, 510, 512, 514, 516, 518,
237 520, 522, 524, 1333, 526, 1555, 2467, 2227, 3205, 3331, 528, 530, 532, 534, 536, 538, 540, 542, 544, 546, 548, 529, 309,
238 1303, 3473, 3457, 389, 1569, 1445, 1077, 69, 2199, 1539, 4353, 550, 552, 554, 556, 558, 560, 562, 1459, 4241, 3221, 1429,
239 2341, 279, 3475, 169, 564, 545, 3105, 323, 2353, 2097, 3235, 421, 2229, 3107, 3233, 566, 568, 570, 572, 574, 576, 578,
240 580, 582, 584, 586, 588, 590, 592, 594, 596, 2099, 1091, 531, 2437, 4227, 405, 197, 263, 1287, 2577, 1049, 1571, 598, 600,
241 602, 604, 606, 608, 610, 612, 614, 616, 618, 620, 622, 624, 626, 628, 630, 632, 634, 636, 638, 640, 642, 644, 646, 648, 650,
242 1345, 1219, 3077, 1457, 2225, 2579, 515, 2561, 2469, 433, 1221, 2183, 4243, 652, 654, 656, 658, 660, 662, 664, 666, 668,
243 670, 1217, 3333, 3093, 435, 321, 4369, 1089, 2055, 4099, 3361, 1319, 547, 1161, 1177, 672, 2355, 4115, 1413, 4257, 3349,
244 2453, 3109, 2357, 2215, 3363, 1079, 1207, 311, 1033, 1347, 1065, 674, 676, 678, 680, 682, 684, 686, 688, 690, 692, 694, 696,
245 698, 700, 702, 704, 706, 708, 710, 712, 714, 716, 718, 720, 722, 724, 726, 728, 730, 732, 734, 736, 738, 740, 742, 744, 746,
246 748, 750, 752, 754, 756, 758, 760, 762, 764, 766, 768, 770, 772, 774, 776, 778, 780, 782, 784, 786, 788, 790, 792, 794, 796,
247 798, 800, 802, 804, 806, 808, 810, 812, 814, 2593, 2565, 4261, 3253, 437, 325, 3489, 2311, 4259, 1431, 2087, 2563, 295, 2343,
248 449, 199, 265, 2201, 4371, 1193, 816, 533, 1557, 2581, 2241, 3365, 3491, 3603, 549, 2101, 1461, 1093, 2117, 3459, 3079, 4481,
249 3095, 2327, 3461, 4129, 3249, 1447, 2471, 2231, 71, 4497, 2609, 1289, 393, 3251, 2073, 3097, 2371, 1305, 2089, 818, 820, 822,
250 824, 826, 828, 830, 832, 834, 836, 838, 840, 842, 844, 846, 848, 850, 852, 854, 856, 858, 860, 862, 864, 866, 868, 870, 872,
251 874, 876, 878, 880, 882, 884, 886, 888, 890, 892, 894, 896, 898, 900, 902, 904, 906, 908, 910, 912, 914, 916, 918, 920, 922,
252 924, 926, 928, 930, 932, 934, 936, 938, 940, 942, 944, 946, 948, 950, 952, 954, 956, 958, 960, 962, 964, 966, 968, 970, 972,
253 974, 976, 978, 980, 982, 984, 986, 988, 990, 992, 994, 996, 998, 1000, 1002, 1004, 1006, 1008, 1010, 1012, 1014, 1016, 1018,
254 1020, 1022, 1024, 1026, 1028, 1030, 1032, 1034, 1036, 4161, 4273, 3507, 3493, 4517, 2497, 1573, 2597, 3621, 4531, 4627, 3523,
255 3125, 4149, 4529, 3139, 4515, 451, 4277, 2113, 4163, 4499, 3381, 4405, 1473, 4373, 2485, 3509, 565, 1589, 2613, 3585, 3123,
256 4403, 3141, 4147, 563, 2245, 3269, 4357, 1349, 2373, 3397, 453, 1477, 2501, 2481, 579, 1601, 3477, 4103, 3265, 2243, 1587,
257 3207, 4231, 3267, 4501, 1475, 3335, 4359, 391, 1415, 2439, 3463, 4487, 519, 1543, 2567, 3591, 4609, 4289, 4611, 2499, 4119,
258 4385, 4145, 4401, 3223, 4247, 3379, 577, 3393, 3351, 4375, 407, 1585, 2455, 3479, 4503, 535, 1559, 2583, 3607, 3605, 4513,
259 4485, 3111, 4135, 3121, 517, 3377, 3239, 4263, 1541, 4291, 4229, 3367, 4391, 423, 2115, 4131, 3495, 551, 1575, 2599, 3635, 3395,
260 2103, 3127, 4151, 3589, 4101, 1603, 3255, 4279, 3601, 1335, 2359, 3383, 439, 1463, 2487, 3511, 567, 1591, 4133, 1095, 2119, 3143,
261 2369, 1223, 2247, 3271, 327, 1351, 2375, 455, 1479, 3137, 3521, 2057, 3081, 4105, 4387, 3505, 2185, 3209, 4233, 3587, 4355, 2313,
262 3337, 3237, 1417, 2441, 3465, 521, 1545, 3617, 3633, 561, 4625, 4121, 2611, 2483, 2595, 3225, 4249, 281, 4245, 2329, 3353, 409,
263 1433, 2457, 3481, 537, 1561, 4483, 3619, 4389, 3113, 4275, 4117, 2217, 3241, 297, 1321, 2345, 3369, 425, 1449, 2473, 57, 1081,
264 2105, 3129, 185, 1209, 2233, 3257, 313, 1337, 2361, 441, 1465, 73, 1097, 201, 1225, 0, 0
265 };
266
267 static const uint16_t decoder_tree4[416] = {
268 2, 4, 6, 1, 8, 10, 12, 14, 16, 18, 20, 22, 24, 3, 129, 26, 28, 9, 33, 30, 32,
269 34, 36, 11, 161, 38, 40, 42, 41, 44, 46, 131, 43, 169, 35, 48, 137, 50, 52, 54, 56, 139,
270 163, 171, 58, 60, 62, 64, 5, 66, 68, 70, 257, 72, 74, 76, 13, 78, 80, 289, 82, 84, 17,
271 86, 88, 65, 90, 201, 19, 92, 94, 51, 193, 96, 98, 49, 100, 73, 102, 104, 106, 45, 108, 110,
272 297, 112, 114, 116, 37, 203, 118, 120, 179, 122, 177, 124, 265, 126, 75, 133, 259, 291, 147, 128, 67,
273 195, 130, 141, 173, 299, 132, 145, 134, 165, 136, 138, 140, 142, 7, 144, 146, 21, 267, 148, 53, 150,
274 321, 152, 154, 15, 156, 81, 158, 160, 385, 162, 417, 164, 166, 168, 83, 170, 172, 329, 174, 211, 176,
275 27, 178, 180, 182, 209, 184, 186, 188, 190, 25, 192, 331, 194, 196, 105, 57, 198, 97, 200, 202, 323,
276 225, 59, 149, 204, 206, 233, 307, 208, 77, 181, 210, 212, 214, 216, 218, 220, 222, 47, 224, 226, 69,
277 228, 230, 197, 232, 425, 393, 205, 275, 293, 39, 234, 236, 238, 305, 135, 155, 301, 143, 240, 242, 235,
278 395, 244, 246, 248, 250, 252, 254, 256, 258, 260, 262, 273, 269, 185, 264, 266, 268, 270, 272, 274, 276,
279 261, 153, 278, 280, 282, 187, 337, 387, 107, 284, 427, 227, 167, 419, 286, 288, 290, 292, 294, 296, 298,
280 300, 302, 304, 306, 308, 310, 312, 314, 316, 318, 320, 322, 324, 326, 328, 330, 332, 334, 336, 338, 115,
281 99, 85, 213, 29, 113, 23, 89, 241, 61, 449, 339, 175, 340, 342, 344, 346, 348, 350, 352, 354, 356,
282 358, 360, 362, 364, 366, 368, 370, 372, 374, 376, 378, 380, 382, 384, 386, 388, 390, 392, 394, 396, 398,
283 400, 402, 404, 406, 408, 410, 412, 414, 389, 361, 457, 465, 429, 451, 333, 109, 277, 243, 263, 295, 199,
284 283, 151, 55, 183, 229, 357, 363, 123, 491, 397, 411, 251, 313, 441, 467, 345, 433, 461, 219, 237, 365,
285 435, 353, 347, 405, 409, 217, 309, 437, 369, 371, 341, 117, 245, 249, 157, 285, 403, 189, 317, 93, 221,
286 315, 401, 481, 391, 489, 121, 421, 423, 71, 483, 327, 103, 231, 443, 459, 271, 399, 355, 91, 303, 431,
287 79, 207, 335, 111, 239, 281, 325, 279, 453, 101, 311, 87, 215, 31, 159, 63, 191
288 };
289
290 static const uint16_t decoder_tree5[384] = {
291 2, 4, 1, 6, 8, 10, 12, 14, 16, 18, 20, 22, 3, 513, 24, 26, 28, 9, 129, 33, 30, 32, 34, 36, 38, 40, 11, 42, 641, 44, 46, 41,
292 161, 48, 515, 50, 52, 131, 54, 35, 545, 137, 56, 58, 60, 521, 62, 43, 673, 64, 169, 66, 68, 523, 70, 163, 643, 139, 553, 72, 649, 74, 547,
293 76, 78, 80, 681, 171, 82, 84, 555, 86, 675, 88, 651, 5, 90, 92, 1025, 94, 96, 98, 683, 13,
294 100, 17, 102, 104, 106, 65, 108, 110, 257, 112, 114, 1153, 19, 116, 118, 120, 122, 124, 49, 126, 128,
295 769, 289, 130, 132, 134, 73, 136, 138, 140, 142, 193, 144, 146, 148, 150, 152, 154, 517, 156, 158, 37,
296 51, 160, 201, 162, 145, 164, 166, 168, 133, 170, 801, 45, 172, 174, 1057, 176, 178, 67, 180, 1027, 577,
297 182, 184, 186, 188, 190, 192, 194, 196, 198, 259, 200, 202, 204, 525, 177, 265, 141, 206, 208, 210, 212,
298 195, 297, 214, 75, 216, 1033, 203, 585, 1155, 1185, 267, 1161, 549, 218, 220, 657, 777, 147, 222, 224, 226,
299 228, 230, 232, 234, 236, 238, 240, 587, 645, 165, 242, 244, 246, 248, 250, 771, 291, 252, 579, 1065, 1035,
300 705, 531, 529, 659, 173, 254, 561, 653, 256, 713, 677, 557, 258, 260, 262, 264, 266, 268, 270, 272, 274,
301 276, 278, 280, 282, 284, 286, 288, 290, 292, 294, 296, 298, 300, 707, 1059, 809, 715, 563, 179, 691, 1193,
302 21, 779, 1067, 299, 1187, 302, 304, 306, 308, 310, 312, 314, 316, 318, 320, 322, 324, 326, 328, 330, 332,
303 334, 336, 338, 340, 342, 344, 346, 348, 350, 352, 354, 356, 358, 360, 362, 364, 366, 368, 370, 372, 374,
304 376, 378, 380, 83, 69, 1281, 803, 321, 1195, 1163, 811, 1323, 689, 1321, 1099, 305, 835, 1227, 331, 843, 785,
305 593, 1043, 1291, 1283, 1171, 275, 787, 1217, 833, 1075, 1313, 1219, 1203, 307, 819, 841, 595, 211, 723, 721, 817,
306 1029, 329, 81, 1157, 261, 773, 1097, 1089, 1061, 1169, 1091, 1189, 293, 805, 1201, 581, 197, 709, 1289, 273, 1037,
307 1315, 1041, 1165, 269, 781, 209, 1073, 1069, 323, 685, 1197, 301, 813, 77, 589, 205, 717, 1225, 533, 149, 661,
308 53, 565, 181, 693, 0, 0
309 };
310
311 static const uint16_t decoder_tree6[62] = {
312 2, 1, 4, 6, 8, 10, 12, 14, 16, 3, 33, 5, 17, 9, 18, 20, 22, 24, 26, 28, 30, 32, 34, 7, 49, 13, 25, 36, 38, 11,
313 21, 41, 35, 37, 19, 40, 42, 44, 46, 48, 50, 15, 52, 57, 29, 27, 23, 53, 54, 51, 39, 45, 43, 56, 58, 31, 55, 60,
314 61, 47, 59, 63
315 };
316
317 static const uint16_t *const decoder_tables[7] = {
318 decoder_tree0,
319 decoder_tree1,
320 decoder_tree2,
321 decoder_tree3,
322 decoder_tree4,
323 decoder_tree5,
324 decoder_tree6,
325 };
326
327 static const int decoder_tables_elements[7] = {
328 FF_ARRAY_ELEMS(decoder_tree0),
329 FF_ARRAY_ELEMS(decoder_tree1),
330 FF_ARRAY_ELEMS(decoder_tree2),
331 FF_ARRAY_ELEMS(decoder_tree3),
332 FF_ARRAY_ELEMS(decoder_tree4),
333 FF_ARRAY_ELEMS(decoder_tree5),
334 FF_ARRAY_ELEMS(decoder_tree6),
335 };
336
337 static const float mlt_quant[7][14] = {
338 { 0.0f, 0.392f, 0.761f, 1.120f, 1.477f, 1.832f, 2.183f, 2.541f, 2.893f, 3.245f, 3.598f, 3.942f, 4.288f, 4.724f },
339 { 0.0f, 0.544f, 1.060f, 1.563f, 2.068f, 2.571f, 3.072f, 3.562f, 4.070f, 4.620f, 0.0f, 0.0f, 0.0f, 0.0f },
340 { 0.0f, 0.746f, 1.464f, 2.180f, 2.882f, 3.584f, 4.316f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f },
341 { 0.0f, 1.006f, 2.000f, 2.993f, 3.985f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f },
342 { 0.0f, 1.321f, 2.703f, 3.983f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f },
343 { 0.0f, 1.657f, 3.491f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f },
344 { 0.0f, 1.964f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f }
345 };
346
347 static const float noise_category5[21] = {
348 0.70711f, 0.6179f, 0.5005f, 0.3220f, 0.17678f, 0.17678f, 0.17678f, 0.17678f, 0.17678f, 0.17678f, 0.17678f,
349 0.17678f, 0.17678f, 0.17678f, 0.17678f, 0.17678f, 0.17678f, 0.17678f, 0.17678f, 0.17678f
350 };
351
352 static const float noise_category6[21] = {
353 0.70711f, 0.5686f, 0.3563f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f,
354 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f, 0.25f
355 };
356
357 #define FRAME_SIZE 320
358 #define REGION_SIZE 20
359
360 typedef struct SirenContext {
361 GetBitContext gb;
362
363 int microsoft;
364 int rate_control_possibilities;
365 int esf_adjustment;
366 int number_of_regions;
367 int scale_factor;
368 int sample_rate_bits;
369 int checksum_bits;
370
371 unsigned dw1, dw2, dw3, dw4;
372
373 int absolute_region_power_index[32];
374 float decoder_standard_deviation[32];
375 int power_categories[32];
376 int category_balance[32];
377 float standard_deviation[64];
378 float backup_frame[FRAME_SIZE];
379
380 AVFloatDSPContext *fdsp;
381 av_tx_fn tx_fn;
382 AVTXContext *tx_ctx;
383
384 DECLARE_ALIGNED(32, float, imdct_buf)[4][FRAME_SIZE];
385 float *window;
386 float *imdct_in;
387 float *imdct_out;
388 float *imdct_prev;
389 } SirenContext;
390
391 2 static av_cold int siren_init(AVCodecContext *avctx)
392 {
393 2 const float scale = 1.0f / (22.f * 32768.f);
394 2 SirenContext *s = avctx->priv_data;
395 int i;
396
397 2 s->imdct_in = s->imdct_buf[0];
398 2 s->imdct_out = s->imdct_buf[1];
399 2 s->imdct_prev = s->imdct_buf[2];
400 2 s->window = s->imdct_buf[3];
401
402 2 av_channel_layout_uninit(&avctx->ch_layout);
403 2 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
404 2 avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
405
406 2 s->rate_control_possibilities = 16;
407 2 s->esf_adjustment = 7;
408 2 s->number_of_regions = 14;
409 2 s->scale_factor = 22;
410 2 s->dw1 = s->dw2 = s->dw3 = s->dw4 = 1;
411
412
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 130 for (i = 0; i < 64; i++) {
413 128 float region_power = powf(10, (i - 24) * 0.3010299957);
414
415 128 s->standard_deviation[i] = sqrtf(region_power);
416 }
417
418
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 642 for (i = 0; i < FRAME_SIZE; i++) {
419 640 float angle = ((i + 0.5f) * M_PI_2) / 320.f;
420 640 s->window[i] = sinf(angle);
421 }
422
423 2 s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
424
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 2 if (!s->fdsp)
425 ✗ return AVERROR(ENOMEM);
426
427 2 s->microsoft = avctx->codec->id == AV_CODEC_ID_MSNSIREN;
428
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 2 if (s->microsoft) {
429 2 s->esf_adjustment = -2;
430 2 s->number_of_regions = 14;
431 2 s->scale_factor = 1;
432 2 s->sample_rate_bits = 2;
433 2 s->checksum_bits = 4;
434 }
435
436 2 return av_tx_init(&s->tx_ctx, &s->tx_fn, AV_TX_FLOAT_MDCT, 1, FRAME_SIZE, &scale, 0);
437 }
438
439 205 static int decode_envelope(SirenContext *s, GetBitContext *gb,
440 int number_of_regions, float *decoder_standard_deviation,
441 int *absolute_region_power_index, int esf_adjustment)
442 {
443 205 absolute_region_power_index[0] = (int)get_bits(gb, 5) - esf_adjustment;
444 205 absolute_region_power_index[0] = av_clip(absolute_region_power_index[0], -24, 39);
445 205 decoder_standard_deviation[0] = s->standard_deviation[absolute_region_power_index[0] + 24];
446
447
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 2870 for (int i = 1; i < number_of_regions; i++) {
448 2665 int index = 0;
449
450 do {
451
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 8477 if (get_bits_left(gb) < 4 + number_of_regions - i + s->checksum_bits)
452 ✗ return AVERROR_INVALIDDATA;
453 8477 index = differential_decoder_tree[i - 1][index][get_bits1(gb)];
454
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 8477 } while (index > 0);
455
456 2665 absolute_region_power_index[i] = av_clip(absolute_region_power_index[i - 1] - index - 12, -24, 39);
457 2665 decoder_standard_deviation[i] = s->standard_deviation[absolute_region_power_index[i] + 24];
458 }
459
460 205 return get_bits_count(gb);
461 }
462
463 205 static int categorize_regions(int number_of_regions, int number_of_available_bits,
464 int *absolute_region_power_index, int *power_categories,
465 int *category_balance)
466 {
467 int region, delta, i, temp;
468 int expected_number_of_code_bits;
469 int min, max;
470 205 int offset, num_rate_control_possibilities = 16,
471 205 raw_value, raw_max_idx = 0, raw_min_idx = 0;
472 int max_rate_categories[28];
473 int min_rate_categories[28];
474 int temp_category_balances[64];
475 205 int *min_rate_ptr = NULL;
476 205 int *max_rate_ptr = NULL;
477
478 205 offset = -32;
479
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 1435 for (delta = 32; number_of_regions > 0 && delta > 0; delta /= 2) {
480 1230 expected_number_of_code_bits = 0;
481
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 18450 for (region = 0; region < number_of_regions; region++) {
482 17220 i = (delta + offset -
483 17220 absolute_region_power_index[region]) >> 1;
484 17220 i = av_clip_uintp2(i, 3);
485 17220 power_categories[region] = i;
486 17220 expected_number_of_code_bits += expected_bits_table[i];
487
488 }
489
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 1230 if (expected_number_of_code_bits >= number_of_available_bits - 32)
490 1001 offset += delta;
491 }
492
493 205 expected_number_of_code_bits = 0;
494
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 3075 for (region = 0; region < number_of_regions; region++) {
495 2870 i = (offset - absolute_region_power_index[region]) >> 1;
496 2870 i = av_clip_uintp2(i, 3);
497 2870 max_rate_categories[region] = min_rate_categories[region] =
498 2870 power_categories[region] = i;
499 2870 expected_number_of_code_bits += expected_bits_table[i];
500 }
501
502 205 min = max = expected_number_of_code_bits;
503 205 min_rate_ptr = max_rate_ptr =
504 205 temp_category_balances + num_rate_control_possibilities;
505
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 3280 for (i = 0; i < num_rate_control_possibilities - 1; i++) {
506
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 3075 if (min + max > number_of_available_bits * 2) {
507 1213 raw_value = -99;
508
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 18195 for (region = number_of_regions - 1; region >= 0; region--) {
509
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 16982 if (min_rate_categories[region] < 7) {
510 9619 temp =
511 9619 offset - absolute_region_power_index[region] -
512 9619 2 * min_rate_categories[region];
513
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 9619 if (temp > raw_value) {
514 2226 raw_value = temp;
515 2226 raw_min_idx = region;
516 }
517 }
518 }
519
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 1213 if (raw_value == -99)
520 ✗ return AVERROR_INVALIDDATA;
521 1213 *min_rate_ptr++ = raw_min_idx;
522 1213 min +=
523 1213 expected_bits_table[min_rate_categories[raw_min_idx] + 1] -
524 1213 expected_bits_table[min_rate_categories[raw_min_idx]];
525 1213 min_rate_categories[raw_min_idx]++;
526 } else {
527 1862 raw_value = 99;
528
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 27930 for (region = 0; region < number_of_regions; region++) {
529
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 26068 if (max_rate_categories[region] > 0) {
530 24835 temp =
531 24835 offset - absolute_region_power_index[region] -
532 24835 2 * max_rate_categories[region];
533
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 24835 if (temp < raw_value) {
534 3854 raw_value = temp;
535 3854 raw_max_idx = region;
536 }
537 }
538 }
539
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 1862 if (raw_value == 99)
540 ✗ return AVERROR_INVALIDDATA;
541
542 1862 *--max_rate_ptr = raw_max_idx;
543 1862 max += expected_bits_table[max_rate_categories[raw_max_idx] - 1] -
544 1862 expected_bits_table[max_rate_categories[raw_max_idx]];
545 1862 max_rate_categories[raw_max_idx]--;
546 }
547 }
548
549
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 3075 for (region = 0; region < number_of_regions; region++)
550 2870 power_categories[region] = max_rate_categories[region];
551
552
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 3280 for (i = 0; i < num_rate_control_possibilities - 1; i++)
553 3075 category_balance[i] = *max_rate_ptr++;
554
555 205 return 0;
556 }
557
558 3466 static int get_dw(SirenContext *s)
559 {
560 3466 int ret = s->dw1 + s->dw4;
561
562
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 3466 if ((ret & 0x8000) != 0)
563 1660 ret++;
564
565 3466 s->dw1 = s->dw2;
566 3466 s->dw2 = s->dw3;
567 3466 s->dw3 = s->dw4;
568 3466 s->dw4 = ret;
569
570 3466 return ret;
571 }
572
573 205 static int decode_vector(SirenContext *s, int number_of_regions,
574 float *decoder_standard_deviation,
575 int *power_categories, float *coefs, int scale_factor)
576 {
577 205 GetBitContext *gb = &s->gb;
578 float *coefs_ptr;
579 float decoded_value;
580 float noise;
581 const uint16_t *decoder_tree;
582 int region;
583 int category;
584 int i, j;
585 int index;
586 205 int error = 0;
587 int dw1;
588 int dw2;
589
590
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 3075 for (region = 0; region < number_of_regions; region++) {
591 2870 category = power_categories[region];
592 2870 coefs_ptr = coefs + (region * REGION_SIZE);
593
594
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 2870 if (category >= 0 && category < 7) {
595 1716 decoder_tree = decoder_tables[category];
596
597
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 11447 for (i = 0; i < number_of_vectors[category]; i++) {
598 9731 index = 0;
599 do {
600
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 42335 if (get_bits_left(gb) - s->checksum_bits <= 0) {
601 ✗ error = 1;
602 ✗ break;
603 }
604
605
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 42335 if (index + show_bits1(gb) >= decoder_tables_elements[category]) {
606 ✗ error = 1;
607 ✗ break;
608 }
609 42335 index = decoder_tree[index + get_bits1(gb)];
610
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 42335 } while ((index & 1) == 0);
611
612 9731 index >>= 1;
613
614
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 9731 if (error == 0) {
615
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 44051 for (j = 0; j < vector_dimension[category]; j++) {
616 34320 decoded_value = mlt_quant[category][index & ((1 << index_table[category]) - 1)];
617 34320 index >>= index_table[category];
618
619
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 34320 if (decoded_value) {
620
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 10775 if (get_bits_left(gb) - s->checksum_bits <= 0) {
621 ✗ error = 1;
622 ✗ break;
623 }
624
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 10775 if (!get_bits1(gb))
625 5527 decoded_value *= -decoder_standard_deviation[region];
626 else
627 5248 decoded_value *= decoder_standard_deviation[region];
628 }
629
630 34320 *coefs_ptr++ = decoded_value * scale_factor;
631 }
632 } else {
633 ✗ error = 1;
634 ✗ break;
635 }
636 }
637
638
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 1716 if (error == 1) {
639 ✗ for (j = region + 1; j < number_of_regions; j++)
640 ✗ power_categories[j] = 7;
641 ✗ category = 7;
642 }
643 }
644
645 2870 coefs_ptr = coefs + (region * REGION_SIZE);
646
647
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 2870 if (category == 5 && s->microsoft) {
648 287 i = 0;
649
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 6027 for (j = 0; j < REGION_SIZE; j++) {
650
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 5740 if (*coefs_ptr != 0) {
651 1283 i++;
652
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 1283 if (fabs(*coefs_ptr) > 2.0 * decoder_standard_deviation[region]) {
653 100 i += 3;
654 }
655 }
656 5740 coefs_ptr++;
657 }
658
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 287 if (i >= FF_ARRAY_ELEMS(noise_category5)) {
659 ✗ error = 1;
660 ✗ break;
661 }
662
663 287 noise = decoder_standard_deviation[region] * noise_category5[i];
664 } else
665
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 2583 if (category == 5 || category == 6) {
666 292 i = 0;
667
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 6132 for (j = 0; j < REGION_SIZE; j++) {
668
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 5840 if (*coefs_ptr != 0)
669 760 i++;
670 5840 coefs_ptr++;
671 }
672
673
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 292 if (category == 5) {
674 ✗ noise = decoder_standard_deviation[region] * noise_category5[i];
675 } else
676 292 noise = decoder_standard_deviation[region] * noise_category6[i];
677
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 2291 } else if (category == 7) {
678 1154 noise = decoder_standard_deviation[region] * 0.70711f;
679 } else {
680 1137 noise = 0;
681 }
682
683 2870 coefs_ptr = coefs + (region * REGION_SIZE);
684
685
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 2870 if (category == 5 || category == 6 || category == 7) {
686 1733 dw1 = get_dw(s);
687 1733 dw2 = get_dw(s);
688
689
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 19063 for (j = 0; j < 10; j++) {
690
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 17330 if (category == 7 || *coefs_ptr == 0)
691
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 16316 *coefs_ptr = dw1 & 1 ? noise : -noise;
692 17330 coefs_ptr++;
693 17330 dw1 >>= 1;
694
695
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 17330 if (category == 7 || *coefs_ptr == 0)
696
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 16301 *coefs_ptr = dw2 & 1 ? noise : -noise;
697 17330 coefs_ptr++;
698 17330 dw2 >>= 1;
699 }
700 }
701 }
702
703
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 205 return error == 1 ? AVERROR_INVALIDDATA : (get_bits_left(gb) - s->checksum_bits);
704 }
705
706 205 static int siren_decode(AVCodecContext *avctx, AVFrame *frame,
707 int *got_frame, AVPacket *avpkt)
708 {
709 205 SirenContext *s = avctx->priv_data;
710 205 GetBitContext *gb = &s->gb;
711 205 int ret, number_of_valid_coefs = REGION_SIZE * s->number_of_regions;
712 205 int frame_error = 0, rate_control = 0;
713 int bits_per_frame;
714
715
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 205 if (s->microsoft) {
716 205 bits_per_frame = avctx->sample_rate / 50;
717
718
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 205 if (avpkt->size < bits_per_frame / 8)
719 ✗ return AVERROR_INVALIDDATA;
720
721
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 205 if ((ret = init_get_bits(gb, avpkt->data, bits_per_frame)) < 0)
722 ✗ return ret;
723 } else
724 ✗ if ((ret = init_get_bits8(gb, avpkt->data, avpkt->size)) < 0)
725 ✗ return ret;
726
727 205 skip_bits(gb, s->sample_rate_bits);
728
729 205 ret = decode_envelope(s, gb, s->number_of_regions,
730 205 s->decoder_standard_deviation,
731 205 s->absolute_region_power_index, s->esf_adjustment);
732
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 205 if (ret < 0)
733 ✗ return ret;
734
735 205 rate_control = get_bits(gb, 4);
736
737 205 ret = categorize_regions(s->number_of_regions, get_bits_left(gb) - s->checksum_bits,
738 205 s->absolute_region_power_index, s->power_categories,
739 205 s->category_balance);
740
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 205 if (ret < 0)
741 ✗ return ret;
742
743
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 1920 for (int i = 0; i < rate_control; i++)
744 1715 s->power_categories[s->category_balance[i]]++;
745
746 205 ret = decode_vector(s, s->number_of_regions,
747 205 s->decoder_standard_deviation, s->power_categories,
748 s->imdct_in, s->scale_factor);
749
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 205 if (ret < 0 && !s->microsoft)
750 ✗ return ret;
751
752
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 205 if (get_bits_left(gb) - s->checksum_bits > 0) {
753 do {
754 938 frame_error |= !get_bits1(gb);
755
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 938 } while (get_bits_left(gb) - s->checksum_bits > 0);
756
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 24 } else if (get_bits_left(gb) - s->checksum_bits < 0 &&
757 ✗ rate_control + 1 < s->rate_control_possibilities) {
758 ✗ frame_error = 1;
759 }
760
761
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 3075 for (int i = 0; i < s->number_of_regions; i++) {
762
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 2870 if (s->absolute_region_power_index[i] > 33 ||
763
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 2870 s->absolute_region_power_index[i] < -31)
764 ✗ frame_error = 1;
765 }
766
767
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 205 if ((avctx->err_recognition & AV_EF_CRCCHECK) && s->checksum_bits) {
768 static const uint16_t ChecksumTable[4] = {0x7F80, 0x7878, 0x6666, 0x5555};
769 int wpf, checksum, sum, calculated_checksum, temp1;
770
771 ✗ checksum = get_bits(gb, s->checksum_bits);
772
773 ✗ wpf = bits_per_frame / 16;
774 ✗ sum = 0;
775 ✗ for (int i = 0; i < wpf - 1; i++)
776 ✗ sum ^= AV_RB16(avpkt->data + i * 2) << (i % 15);
777 ✗ sum ^= (AV_RB16(avpkt->data + (wpf - 1) * 2) & ~checksum) << ((wpf - 1) % 15);
778 ✗ sum = (sum >> 15) ^ (sum & 0x7FFF);
779
780 ✗ calculated_checksum = 0;
781 ✗ for (int i = 0; i < 4; i++) {
782 ✗ temp1 = ChecksumTable[i] & sum;
783
784 ✗ for (int j = 8; j > 0; j >>= 1)
785 ✗ temp1 ^= temp1 >> j;
786
787 ✗ calculated_checksum <<= 1;
788 ✗ calculated_checksum |= temp1 & 1;
789 }
790
791 ✗ if (checksum != calculated_checksum) {
792 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid checksum\n");
793 ✗ if (avctx->err_recognition & AV_EF_EXPLODE)
794 ✗ return AVERROR_INVALIDDATA;
795 ✗ frame_error = 1;
796 }
797 }
798
799
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 205 if (frame_error) {
800 ✗ memcpy(s->imdct_in, s->backup_frame, number_of_valid_coefs * sizeof(float));
801 ✗ memset(s->backup_frame, 0, number_of_valid_coefs * sizeof(float));
802 } else {
803 205 memcpy(s->backup_frame, s->imdct_in, number_of_valid_coefs * sizeof(float));
804 }
805
806 205 frame->nb_samples = FRAME_SIZE;
807
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 205 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
808 ✗ return ret;
809
810
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 33005 for (int i = 0; i < FRAME_SIZE; i += 2)
811 32800 s->imdct_in[i] *= -1;
812
813 205 s->tx_fn(s->tx_ctx, s->imdct_out, s->imdct_in, sizeof(float));
814 205 s->fdsp->vector_fmul_window((float *)frame->data[0],
815 205 s->imdct_prev + (FRAME_SIZE >> 1),
816 205 s->imdct_out, s->window,
817 FRAME_SIZE >> 1);
818 205 FFSWAP(float *, s->imdct_out, s->imdct_prev);
819
820 205 *got_frame = 1;
821
822
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 205 return s->microsoft ? bits_per_frame / 8 : avpkt->size;
823 }
824
825 ✗ static av_cold void siren_flush(AVCodecContext *avctx)
826 {
827 ✗ SirenContext *s = avctx->priv_data;
828
829 ✗ memset(s->backup_frame, 0, sizeof(s->backup_frame));
830 ✗ memset(s->imdct_prev, 0, FRAME_SIZE * sizeof(*s->imdct_prev));
831 ✗ memset(s->imdct_out, 0, FRAME_SIZE * sizeof(*s->imdct_out));
832 ✗ }
833
834 2 static av_cold int siren_close(AVCodecContext *avctx)
835 {
836 2 SirenContext *s = avctx->priv_data;
837
838 2 av_freep(&s->fdsp);
839 2 av_tx_uninit(&s->tx_ctx);
840
841 2 return 0;
842 }
843
844 const FFCodec ff_siren_decoder = {
845 .p.name = "siren",
846 CODEC_LONG_NAME("Siren"),
847 .priv_data_size = sizeof(SirenContext),
848 .p.type = AVMEDIA_TYPE_AUDIO,
849 .p.id = AV_CODEC_ID_SIREN,
850 .init = siren_init,
851 .close = siren_close,
852 FF_CODEC_DECODE_CB(siren_decode),
853 .flush = siren_flush,
854 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
855 AV_CODEC_CAP_DR1,
856 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
857 };
858
859 const FFCodec ff_msnsiren_decoder = {
860 .p.name = "msnsiren",
861 CODEC_LONG_NAME("MSN Siren"),
862 .priv_data_size = sizeof(SirenContext),
863 .p.type = AVMEDIA_TYPE_AUDIO,
864 .p.id = AV_CODEC_ID_MSNSIREN,
865 .init = siren_init,
866 .close = siren_close,
867 FF_CODEC_DECODE_CB(siren_decode),
868 .flush = siren_flush,
869 .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
870 AV_CODEC_CAP_DR1,
871 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
872 };
873