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comparison tchtools/gsm0610.c @ 902:8ddb16a37273

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tree org: move TCH and VM utils from miscutil to tchtools
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 28 Dec 2022 07:52:30 +0000
parents miscutil/gsm0610.c@08804864172a
children
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901:2e6764022292 902:8ddb16a37273
1 /*
2 * This code (lifted from OsmocomBB) facilitates the conversion of 33-byte
3 * GSM 06.10 encoded speech frames between the bit order at the 06.10 interface
4 * in the de facto standard libgsm implementation and the bit order at the
5 * 05.03 channel encoder interface, as realized in TI's Calypso DSP.
6 */
7
8 #include <sys/types.h>
9 #include <string.h>
10 #include <strings.h>
11
12 /* GSM FR - subjective importance bit ordering */
13 /* This array encodes GSM 05.03 Table 2.
14 * It's also GSM 06.10 Table A.2.1a
15 *
16 * It converts between serial parameter output by the encoder and the
17 * order needed before channel encoding.
18 */
19 const u_short gsm0610_bitorder[260] = {
20 0, /* LARc0:5 */
21 47, /* Xmaxc0:5 */
22 103, /* Xmaxc1:5 */
23 159, /* Xmaxc2:5 */
24 215, /* Xmaxc3:5 */
25 1, /* LARc0:4 */
26 6, /* LARc1:5 */
27 12, /* LARc2:4 */
28 2, /* LARc0:3 */
29 7, /* LARc1:4 */
30 13, /* LARc2:3 */
31 17, /* LARc3:4 */
32 36, /* Nc0:6 */
33 92, /* Nc1:6 */
34 148, /* Nc2:6 */
35 204, /* Nc3:6 */
36 48, /* Xmaxc0:4 */
37 104, /* Xmaxc1:4 */
38 160, /* Xmaxc2:4 */
39 216, /* Xmaxc3:4 */
40 8, /* LARc1:3 */
41 22, /* LARc4:3 */
42 26, /* LARc5:3 */
43 37, /* Nc0:5 */
44 93, /* Nc1:5 */
45 149, /* Nc2:5 */
46 205, /* Nc3:5 */
47 38, /* Nc0:4 */
48 94, /* Nc1:4 */
49 150, /* Nc2:4 */
50 206, /* Nc3:4 */
51 39, /* Nc0:3 */
52 95, /* Nc1:3 */
53 151, /* Nc2:3 */
54 207, /* Nc3:3 */
55 40, /* Nc0:2 */
56 96, /* Nc1:2 */
57 152, /* Nc2:2 */
58 208, /* Nc3:2 */
59 49, /* Xmaxc0:3 */
60 105, /* Xmaxc1:3 */
61 161, /* Xmaxc2:3 */
62 217, /* Xmaxc3:3 */
63 3, /* LARc0:2 */
64 18, /* LARc3:3 */
65 30, /* LARc6:2 */
66 41, /* Nc0:1 */
67 97, /* Nc1:1 */
68 153, /* Nc2:1 */
69 209, /* Nc3:1 */
70 23, /* LARc4:2 */
71 27, /* LARc5:2 */
72 43, /* bc0:1 */
73 99, /* bc1:1 */
74 155, /* bc2:1 */
75 211, /* bc3:1 */
76 42, /* Nc0:0 */
77 98, /* Nc1:0 */
78 154, /* Nc2:0 */
79 210, /* Nc3:0 */
80 45, /* Mc0:1 */
81 101, /* Mc1:1 */
82 157, /* Mc2:1 */
83 213, /* Mc3:1 */
84 4, /* LARc0:1 */
85 9, /* LARc1:2 */
86 14, /* LARc2:2 */
87 33, /* LARc7:2 */
88 19, /* LARc3:2 */
89 24, /* LARc4:1 */
90 31, /* LARc6:1 */
91 44, /* bc0:0 */
92 100, /* bc1:0 */
93 156, /* bc2:0 */
94 212, /* bc3:0 */
95 50, /* Xmaxc0:2 */
96 106, /* Xmaxc1:2 */
97 162, /* Xmaxc2:2 */
98 218, /* Xmaxc3:2 */
99 53, /* xmc0_0:2 */
100 56, /* xmc0_1:2 */
101 59, /* xmc0_2:2 */
102 62, /* xmc0_3:2 */
103 65, /* xmc0_4:2 */
104 68, /* xmc0_5:2 */
105 71, /* xmc0_6:2 */
106 74, /* xmc0_7:2 */
107 77, /* xmc0_8:2 */
108 80, /* xmc0_9:2 */
109 83, /* xmc0_10:2 */
110 86, /* xmc0_11:2 */
111 89, /* xmc0_12:2 */
112 109, /* xmc1_0:2 */
113 112, /* xmc1_1:2 */
114 115, /* xmc1_2:2 */
115 118, /* xmc1_3:2 */
116 121, /* xmc1_4:2 */
117 124, /* xmc1_5:2 */
118 127, /* xmc1_6:2 */
119 130, /* xmc1_7:2 */
120 133, /* xmc1_8:2 */
121 136, /* xmc1_9:2 */
122 139, /* xmc1_10:2 */
123 142, /* xmc1_11:2 */
124 145, /* xmc1_12:2 */
125 165, /* xmc2_0:2 */
126 168, /* xmc2_1:2 */
127 171, /* xmc2_2:2 */
128 174, /* xmc2_3:2 */
129 177, /* xmc2_4:2 */
130 180, /* xmc2_5:2 */
131 183, /* xmc2_6:2 */
132 186, /* xmc2_7:2 */
133 189, /* xmc2_8:2 */
134 192, /* xmc2_9:2 */
135 195, /* xmc2_10:2 */
136 198, /* xmc2_11:2 */
137 201, /* xmc2_12:2 */
138 221, /* xmc3_0:2 */
139 224, /* xmc3_1:2 */
140 227, /* xmc3_2:2 */
141 230, /* xmc3_3:2 */
142 233, /* xmc3_4:2 */
143 236, /* xmc3_5:2 */
144 239, /* xmc3_6:2 */
145 242, /* xmc3_7:2 */
146 245, /* xmc3_8:2 */
147 248, /* xmc3_9:2 */
148 251, /* xmc3_10:2 */
149 254, /* xmc3_11:2 */
150 257, /* xmc3_12:2 */
151 46, /* Mc0:0 */
152 102, /* Mc1:0 */
153 158, /* Mc2:0 */
154 214, /* Mc3:0 */
155 51, /* Xmaxc0:1 */
156 107, /* Xmaxc1:1 */
157 163, /* Xmaxc2:1 */
158 219, /* Xmaxc3:1 */
159 54, /* xmc0_0:1 */
160 57, /* xmc0_1:1 */
161 60, /* xmc0_2:1 */
162 63, /* xmc0_3:1 */
163 66, /* xmc0_4:1 */
164 69, /* xmc0_5:1 */
165 72, /* xmc0_6:1 */
166 75, /* xmc0_7:1 */
167 78, /* xmc0_8:1 */
168 81, /* xmc0_9:1 */
169 84, /* xmc0_10:1 */
170 87, /* xmc0_11:1 */
171 90, /* xmc0_12:1 */
172 110, /* xmc1_0:1 */
173 113, /* xmc1_1:1 */
174 116, /* xmc1_2:1 */
175 119, /* xmc1_3:1 */
176 122, /* xmc1_4:1 */
177 125, /* xmc1_5:1 */
178 128, /* xmc1_6:1 */
179 131, /* xmc1_7:1 */
180 134, /* xmc1_8:1 */
181 137, /* xmc1_9:1 */
182 140, /* xmc1_10:1 */
183 143, /* xmc1_11:1 */
184 146, /* xmc1_12:1 */
185 166, /* xmc2_0:1 */
186 169, /* xmc2_1:1 */
187 172, /* xmc2_2:1 */
188 175, /* xmc2_3:1 */
189 178, /* xmc2_4:1 */
190 181, /* xmc2_5:1 */
191 184, /* xmc2_6:1 */
192 187, /* xmc2_7:1 */
193 190, /* xmc2_8:1 */
194 193, /* xmc2_9:1 */
195 196, /* xmc2_10:1 */
196 199, /* xmc2_11:1 */
197 202, /* xmc2_12:1 */
198 222, /* xmc3_0:1 */
199 225, /* xmc3_1:1 */
200 228, /* xmc3_2:1 */
201 231, /* xmc3_3:1 */
202 234, /* xmc3_4:1 */
203 237, /* xmc3_5:1 */
204 240, /* xmc3_6:1 */
205 243, /* xmc3_7:1 */
206 246, /* xmc3_8:1 */
207 249, /* xmc3_9:1 */
208 252, /* xmc3_10:1 */
209 255, /* xmc3_11:1 */
210 258, /* xmc3_12:1 */
211 5, /* LARc0:0 */
212 10, /* LARc1:1 */
213 15, /* LARc2:1 */
214 28, /* LARc5:1 */
215 32, /* LARc6:0 */
216 34, /* LARc7:1 */
217 35, /* LARc7:0 */
218 16, /* LARc2:0 */
219 20, /* LARc3:1 */
220 21, /* LARc3:0 */
221 25, /* LARc4:0 */
222 52, /* Xmaxc0:0 */
223 108, /* Xmaxc1:0 */
224 164, /* Xmaxc2:0 */
225 220, /* Xmaxc3:0 */
226 55, /* xmc0_0:0 */
227 58, /* xmc0_1:0 */
228 61, /* xmc0_2:0 */
229 64, /* xmc0_3:0 */
230 67, /* xmc0_4:0 */
231 70, /* xmc0_5:0 */
232 73, /* xmc0_6:0 */
233 76, /* xmc0_7:0 */
234 79, /* xmc0_8:0 */
235 82, /* xmc0_9:0 */
236 85, /* xmc0_10:0 */
237 88, /* xmc0_11:0 */
238 91, /* xmc0_12:0 */
239 111, /* xmc1_0:0 */
240 114, /* xmc1_1:0 */
241 117, /* xmc1_2:0 */
242 120, /* xmc1_3:0 */
243 123, /* xmc1_4:0 */
244 126, /* xmc1_5:0 */
245 129, /* xmc1_6:0 */
246 132, /* xmc1_7:0 */
247 135, /* xmc1_8:0 */
248 138, /* xmc1_9:0 */
249 141, /* xmc1_10:0 */
250 144, /* xmc1_11:0 */
251 147, /* xmc1_12:0 */
252 167, /* xmc2_0:0 */
253 170, /* xmc2_1:0 */
254 173, /* xmc2_2:0 */
255 176, /* xmc2_3:0 */
256 179, /* xmc2_4:0 */
257 182, /* xmc2_5:0 */
258 185, /* xmc2_6:0 */
259 188, /* xmc2_7:0 */
260 191, /* xmc2_8:0 */
261 194, /* xmc2_9:0 */
262 197, /* xmc2_10:0 */
263 200, /* xmc2_11:0 */
264 203, /* xmc2_12:0 */
265 223, /* xmc3_0:0 */
266 226, /* xmc3_1:0 */
267 229, /* xmc3_2:0 */
268 232, /* xmc3_3:0 */
269 235, /* xmc3_4:0 */
270 238, /* xmc3_5:0 */
271 241, /* xmc3_6:0 */
272 244, /* xmc3_7:0 */
273 247, /* xmc3_8:0 */
274 250, /* xmc3_9:0 */
275 253, /* xmc3_10:0 */
276 256, /* xmc3_11:0 */
277 259, /* xmc3_12:0 */
278 11, /* LARc1:0 */
279 29, /* LARc5:0 */
280 };
281
282 static int
283 msb_get_bit(buf, bn)
284 u_char *buf;
285 {
286 int pos_byte = bn >> 3;
287 int pos_bit = 7 - (bn & 7);
288
289 return (buf[pos_byte] >> pos_bit) & 1;
290 }
291
292 static void
293 msb_set_bit(buf, bn, bit)
294 u_char *buf;
295 {
296 int pos_byte = bn >> 3;
297 int pos_bit = 7 - (bn & 7);
298
299 buf[pos_byte] |= (bit << pos_bit);
300 }
301
302 void
303 gsm0610_tidsp_to_libgsm(inbytes, outbytes)
304 u_char *inbytes, *outbytes;
305 {
306 int i, di, si;
307
308 bzero(outbytes, 33);
309 outbytes[0] = 0xD0;
310 for (i = 0; i < 260; i++) {
311 di = gsm0610_bitorder[i];
312 si = (i > 181) ? i + 4 : i;
313 msb_set_bit(outbytes, 4 + di, msb_get_bit(inbytes, si));
314 }
315 }
316
317 void
318 gsm0610_libgsm_to_tidsp(inbytes, outbytes)
319 u_char *inbytes, *outbytes;
320 {
321 int i, di, si;
322
323 bzero(outbytes, 33);
324 for (i = 0; i < 260; i++) {
325 si = gsm0610_bitorder[i];
326 di = (i > 181) ? i + 4 : i;
327 msb_set_bit(outbytes, di, msb_get_bit(inbytes, 4 + si));
328 }
329 }