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1 /*
2  * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
3  * Universitaet Berlin.  See the accompanying file "COPYRIGHT" for
4  * details.  THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
5  */
6 
7 /* $Header: /tmp_amd/presto/export/kbs/jutta/src/gsm/RCS/gsm_decode.c,v 1.2 1996/07/02 09:59:05 jutta Exp $ */
8 
9 #include "private.h"
10 
11 #include "gsm.h"
12 #include "proto.h"
13 
14 int gsm_decode P3((s, c, target), gsm s, gsm_byte * c, gsm_signal * target)
15 {
16 	word  	LARc[8], Nc[4], Mc[4], bc[4], xmaxc[4], xmc[13*4];
17 
18 #ifdef WAV49
19 	if (s->wav_fmt) {
20 
21 		uword sr = 0;
22 
23 		s->frame_index = !s->frame_index;
24 		if (s->frame_index) {
25 
26 			sr = *c++;
27 			LARc[0] = sr & 0x3f;  sr >>= 6;
28 			sr |= (uword)*c++ << 2;
29 			LARc[1] = sr & 0x3f;  sr >>= 6;
30 			sr |= (uword)*c++ << 4;
31 			LARc[2] = sr & 0x1f;  sr >>= 5;
32 			LARc[3] = sr & 0x1f;  sr >>= 5;
33 			sr |= (uword)*c++ << 2;
34 			LARc[4] = sr & 0xf;  sr >>= 4;
35 			LARc[5] = sr & 0xf;  sr >>= 4;
36 			sr |= (uword)*c++ << 2;			/* 5 */
37 			LARc[6] = sr & 0x7;  sr >>= 3;
38 			LARc[7] = sr & 0x7;  sr >>= 3;
39 			sr |= (uword)*c++ << 4;
40 			Nc[0] = sr & 0x7f;  sr >>= 7;
41 			bc[0] = sr & 0x3;  sr >>= 2;
42 			Mc[0] = sr & 0x3;  sr >>= 2;
43 			sr |= (uword)*c++ << 1;
44 			xmaxc[0] = sr & 0x3f;  sr >>= 6;
45 			xmc[0] = sr & 0x7;  sr >>= 3;
46 			sr = *c++;
47 			xmc[1] = sr & 0x7;  sr >>= 3;
48 			xmc[2] = sr & 0x7;  sr >>= 3;
49 			sr |= (uword)*c++ << 2;
50 			xmc[3] = sr & 0x7;  sr >>= 3;
51 			xmc[4] = sr & 0x7;  sr >>= 3;
52 			xmc[5] = sr & 0x7;  sr >>= 3;
53 			sr |= (uword)*c++ << 1;			/* 10 */
54 			xmc[6] = sr & 0x7;  sr >>= 3;
55 			xmc[7] = sr & 0x7;  sr >>= 3;
56 			xmc[8] = sr & 0x7;  sr >>= 3;
57 			sr = *c++;
58 			xmc[9] = sr & 0x7;  sr >>= 3;
59 			xmc[10] = sr & 0x7;  sr >>= 3;
60 			sr |= (uword)*c++ << 2;
61 			xmc[11] = sr & 0x7;  sr >>= 3;
62 			xmc[12] = sr & 0x7;  sr >>= 3;
63 			sr |= (uword)*c++ << 4;
64 			Nc[1] = sr & 0x7f;  sr >>= 7;
65 			bc[1] = sr & 0x3;  sr >>= 2;
66 			Mc[1] = sr & 0x3;  sr >>= 2;
67 			sr |= (uword)*c++ << 1;
68 			xmaxc[1] = sr & 0x3f;  sr >>= 6;
69 			xmc[13] = sr & 0x7;  sr >>= 3;
70 			sr = *c++;				/* 15 */
71 			xmc[14] = sr & 0x7;  sr >>= 3;
72 			xmc[15] = sr & 0x7;  sr >>= 3;
73 			sr |= (uword)*c++ << 2;
74 			xmc[16] = sr & 0x7;  sr >>= 3;
75 			xmc[17] = sr & 0x7;  sr >>= 3;
76 			xmc[18] = sr & 0x7;  sr >>= 3;
77 			sr |= (uword)*c++ << 1;
78 			xmc[19] = sr & 0x7;  sr >>= 3;
79 			xmc[20] = sr & 0x7;  sr >>= 3;
80 			xmc[21] = sr & 0x7;  sr >>= 3;
81 			sr = *c++;
82 			xmc[22] = sr & 0x7;  sr >>= 3;
83 			xmc[23] = sr & 0x7;  sr >>= 3;
84 			sr |= (uword)*c++ << 2;
85 			xmc[24] = sr & 0x7;  sr >>= 3;
86 			xmc[25] = sr & 0x7;  sr >>= 3;
87 			sr |= (uword)*c++ << 4;			/* 20 */
88 			Nc[2] = sr & 0x7f;  sr >>= 7;
89 			bc[2] = sr & 0x3;  sr >>= 2;
90 			Mc[2] = sr & 0x3;  sr >>= 2;
91 			sr |= (uword)*c++ << 1;
92 			xmaxc[2] = sr & 0x3f;  sr >>= 6;
93 			xmc[26] = sr & 0x7;  sr >>= 3;
94 			sr = *c++;
95 			xmc[27] = sr & 0x7;  sr >>= 3;
96 			xmc[28] = sr & 0x7;  sr >>= 3;
97 			sr |= (uword)*c++ << 2;
98 			xmc[29] = sr & 0x7;  sr >>= 3;
99 			xmc[30] = sr & 0x7;  sr >>= 3;
100 			xmc[31] = sr & 0x7;  sr >>= 3;
101 			sr |= (uword)*c++ << 1;
102 			xmc[32] = sr & 0x7;  sr >>= 3;
103 			xmc[33] = sr & 0x7;  sr >>= 3;
104 			xmc[34] = sr & 0x7;  sr >>= 3;
105 			sr = *c++;				/* 25 */
106 			xmc[35] = sr & 0x7;  sr >>= 3;
107 			xmc[36] = sr & 0x7;  sr >>= 3;
108 			sr |= (uword)*c++ << 2;
109 			xmc[37] = sr & 0x7;  sr >>= 3;
110 			xmc[38] = sr & 0x7;  sr >>= 3;
111 			sr |= (uword)*c++ << 4;
112 			Nc[3] = sr & 0x7f;  sr >>= 7;
113 			bc[3] = sr & 0x3;  sr >>= 2;
114 			Mc[3] = sr & 0x3;  sr >>= 2;
115 			sr |= (uword)*c++ << 1;
116 			xmaxc[3] = sr & 0x3f;  sr >>= 6;
117 			xmc[39] = sr & 0x7;  sr >>= 3;
118 			sr = *c++;
119 			xmc[40] = sr & 0x7;  sr >>= 3;
120 			xmc[41] = sr & 0x7;  sr >>= 3;
121 			sr |= (uword)*c++ << 2;			/* 30 */
122 			xmc[42] = sr & 0x7;  sr >>= 3;
123 			xmc[43] = sr & 0x7;  sr >>= 3;
124 			xmc[44] = sr & 0x7;  sr >>= 3;
125 			sr |= (uword)*c++ << 1;
126 			xmc[45] = sr & 0x7;  sr >>= 3;
127 			xmc[46] = sr & 0x7;  sr >>= 3;
128 			xmc[47] = sr & 0x7;  sr >>= 3;
129 			sr = *c++;
130 			xmc[48] = sr & 0x7;  sr >>= 3;
131 			xmc[49] = sr & 0x7;  sr >>= 3;
132 			sr |= (uword)*c++ << 2;
133 			xmc[50] = sr & 0x7;  sr >>= 3;
134 			xmc[51] = sr & 0x7;  sr >>= 3;
135 
136 			s->frame_chain = sr & 0xf;
137 		}
138 		else {
139 			sr = s->frame_chain;
140 			sr |= (uword)*c++ << 4;			/* 1 */
141 			LARc[0] = sr & 0x3f;  sr >>= 6;
142 			LARc[1] = sr & 0x3f;  sr >>= 6;
143 			sr = *c++;
144 			LARc[2] = sr & 0x1f;  sr >>= 5;
145 			sr |= (uword)*c++ << 3;
146 			LARc[3] = sr & 0x1f;  sr >>= 5;
147 			LARc[4] = sr & 0xf;  sr >>= 4;
148 			sr |= (uword)*c++ << 2;
149 			LARc[5] = sr & 0xf;  sr >>= 4;
150 			LARc[6] = sr & 0x7;  sr >>= 3;
151 			LARc[7] = sr & 0x7;  sr >>= 3;
152 			sr = *c++;				/* 5 */
153 			Nc[0] = sr & 0x7f;  sr >>= 7;
154 			sr |= (uword)*c++ << 1;
155 			bc[0] = sr & 0x3;  sr >>= 2;
156 			Mc[0] = sr & 0x3;  sr >>= 2;
157 			sr |= (uword)*c++ << 5;
158 			xmaxc[0] = sr & 0x3f;  sr >>= 6;
159 			xmc[0] = sr & 0x7;  sr >>= 3;
160 			xmc[1] = sr & 0x7;  sr >>= 3;
161 			sr |= (uword)*c++ << 1;
162 			xmc[2] = sr & 0x7;  sr >>= 3;
163 			xmc[3] = sr & 0x7;  sr >>= 3;
164 			xmc[4] = sr & 0x7;  sr >>= 3;
165 			sr = *c++;
166 			xmc[5] = sr & 0x7;  sr >>= 3;
167 			xmc[6] = sr & 0x7;  sr >>= 3;
168 			sr |= (uword)*c++ << 2;			/* 10 */
169 			xmc[7] = sr & 0x7;  sr >>= 3;
170 			xmc[8] = sr & 0x7;  sr >>= 3;
171 			xmc[9] = sr & 0x7;  sr >>= 3;
172 			sr |= (uword)*c++ << 1;
173 			xmc[10] = sr & 0x7;  sr >>= 3;
174 			xmc[11] = sr & 0x7;  sr >>= 3;
175 			xmc[12] = sr & 0x7;  sr >>= 3;
176 			sr = *c++;
177 			Nc[1] = sr & 0x7f;  sr >>= 7;
178 			sr |= (uword)*c++ << 1;
179 			bc[1] = sr & 0x3;  sr >>= 2;
180 			Mc[1] = sr & 0x3;  sr >>= 2;
181 			sr |= (uword)*c++ << 5;
182 			xmaxc[1] = sr & 0x3f;  sr >>= 6;
183 			xmc[13] = sr & 0x7;  sr >>= 3;
184 			xmc[14] = sr & 0x7;  sr >>= 3;
185 			sr |= (uword)*c++ << 1;			/* 15 */
186 			xmc[15] = sr & 0x7;  sr >>= 3;
187 			xmc[16] = sr & 0x7;  sr >>= 3;
188 			xmc[17] = sr & 0x7;  sr >>= 3;
189 			sr = *c++;
190 			xmc[18] = sr & 0x7;  sr >>= 3;
191 			xmc[19] = sr & 0x7;  sr >>= 3;
192 			sr |= (uword)*c++ << 2;
193 			xmc[20] = sr & 0x7;  sr >>= 3;
194 			xmc[21] = sr & 0x7;  sr >>= 3;
195 			xmc[22] = sr & 0x7;  sr >>= 3;
196 			sr |= (uword)*c++ << 1;
197 			xmc[23] = sr & 0x7;  sr >>= 3;
198 			xmc[24] = sr & 0x7;  sr >>= 3;
199 			xmc[25] = sr & 0x7;  sr >>= 3;
200 			sr = *c++;
201 			Nc[2] = sr & 0x7f;  sr >>= 7;
202 			sr |= (uword)*c++ << 1;			/* 20 */
203 			bc[2] = sr & 0x3;  sr >>= 2;
204 			Mc[2] = sr & 0x3;  sr >>= 2;
205 			sr |= (uword)*c++ << 5;
206 			xmaxc[2] = sr & 0x3f;  sr >>= 6;
207 			xmc[26] = sr & 0x7;  sr >>= 3;
208 			xmc[27] = sr & 0x7;  sr >>= 3;
209 			sr |= (uword)*c++ << 1;
210 			xmc[28] = sr & 0x7;  sr >>= 3;
211 			xmc[29] = sr & 0x7;  sr >>= 3;
212 			xmc[30] = sr & 0x7;  sr >>= 3;
213 			sr = *c++;
214 			xmc[31] = sr & 0x7;  sr >>= 3;
215 			xmc[32] = sr & 0x7;  sr >>= 3;
216 			sr |= (uword)*c++ << 2;
217 			xmc[33] = sr & 0x7;  sr >>= 3;
218 			xmc[34] = sr & 0x7;  sr >>= 3;
219 			xmc[35] = sr & 0x7;  sr >>= 3;
220 			sr |= (uword)*c++ << 1;			/* 25 */
221 			xmc[36] = sr & 0x7;  sr >>= 3;
222 			xmc[37] = sr & 0x7;  sr >>= 3;
223 			xmc[38] = sr & 0x7;  sr >>= 3;
224 			sr = *c++;
225 			Nc[3] = sr & 0x7f;  sr >>= 7;
226 			sr |= (uword)*c++ << 1;
227 			bc[3] = sr & 0x3;  sr >>= 2;
228 			Mc[3] = sr & 0x3;  sr >>= 2;
229 			sr |= (uword)*c++ << 5;
230 			xmaxc[3] = sr & 0x3f;  sr >>= 6;
231 			xmc[39] = sr & 0x7;  sr >>= 3;
232 			xmc[40] = sr & 0x7;  sr >>= 3;
233 			sr |= (uword)*c++ << 1;
234 			xmc[41] = sr & 0x7;  sr >>= 3;
235 			xmc[42] = sr & 0x7;  sr >>= 3;
236 			xmc[43] = sr & 0x7;  sr >>= 3;
237 			sr = *c++;				/* 30 */
238 			xmc[44] = sr & 0x7;  sr >>= 3;
239 			xmc[45] = sr & 0x7;  sr >>= 3;
240 			sr |= (uword)*c++ << 2;
241 			xmc[46] = sr & 0x7;  sr >>= 3;
242 			xmc[47] = sr & 0x7;  sr >>= 3;
243 			xmc[48] = sr & 0x7;  sr >>= 3;
244 			sr |= (uword)*c++ << 1;
245 			xmc[49] = sr & 0x7;  sr >>= 3;
246 			xmc[50] = sr & 0x7;  sr >>= 3;
247 			xmc[51] = sr & 0x7;  sr >>= 3;
248 		}
249 	}
250 	else
251 #endif
252 	{
253 		/* GSM_MAGIC  = (*c >> 4) & 0xF; */
254 
255 		if (((*c >> 4) & 0x0F) != GSM_MAGIC) return -1;
256 
257 		LARc[0]  = (*c++ & 0xF) << 2;		/* 1 */
258 		LARc[0] |= (*c >> 6) & 0x3;
259 		LARc[1]  = *c++ & 0x3F;
260 		LARc[2]  = (*c >> 3) & 0x1F;
261 		LARc[3]  = (*c++ & 0x7) << 2;
262 		LARc[3] |= (*c >> 6) & 0x3;
263 		LARc[4]  = (*c >> 2) & 0xF;
264 		LARc[5]  = (*c++ & 0x3) << 2;
265 		LARc[5] |= (*c >> 6) & 0x3;
266 		LARc[6]  = (*c >> 3) & 0x7;
267 		LARc[7]  = *c++ & 0x7;
268 		Nc[0]  = (*c >> 1) & 0x7F;
269 		bc[0]  = (*c++ & 0x1) << 1;
270 		bc[0] |= (*c >> 7) & 0x1;
271 		Mc[0]  = (*c >> 5) & 0x3;
272 		xmaxc[0]  = (*c++ & 0x1F) << 1;
273 		xmaxc[0] |= (*c >> 7) & 0x1;
274 		xmc[0]  = (*c >> 4) & 0x7;
275 		xmc[1]  = (*c >> 1) & 0x7;
276 		xmc[2]  = (*c++ & 0x1) << 2;
277 		xmc[2] |= (*c >> 6) & 0x3;
278 		xmc[3]  = (*c >> 3) & 0x7;
279 		xmc[4]  = *c++ & 0x7;
280 		xmc[5]  = (*c >> 5) & 0x7;
281 		xmc[6]  = (*c >> 2) & 0x7;
282 		xmc[7]  = (*c++ & 0x3) << 1;		/* 10 */
283 		xmc[7] |= (*c >> 7) & 0x1;
284 		xmc[8]  = (*c >> 4) & 0x7;
285 		xmc[9]  = (*c >> 1) & 0x7;
286 		xmc[10]  = (*c++ & 0x1) << 2;
287 		xmc[10] |= (*c >> 6) & 0x3;
288 		xmc[11]  = (*c >> 3) & 0x7;
289 		xmc[12]  = *c++ & 0x7;
290 		Nc[1]  = (*c >> 1) & 0x7F;
291 		bc[1]  = (*c++ & 0x1) << 1;
292 		bc[1] |= (*c >> 7) & 0x1;
293 		Mc[1]  = (*c >> 5) & 0x3;
294 		xmaxc[1]  = (*c++ & 0x1F) << 1;
295 		xmaxc[1] |= (*c >> 7) & 0x1;
296 		xmc[13]  = (*c >> 4) & 0x7;
297 		xmc[14]  = (*c >> 1) & 0x7;
298 		xmc[15]  = (*c++ & 0x1) << 2;
299 		xmc[15] |= (*c >> 6) & 0x3;
300 		xmc[16]  = (*c >> 3) & 0x7;
301 		xmc[17]  = *c++ & 0x7;
302 		xmc[18]  = (*c >> 5) & 0x7;
303 		xmc[19]  = (*c >> 2) & 0x7;
304 		xmc[20]  = (*c++ & 0x3) << 1;
305 		xmc[20] |= (*c >> 7) & 0x1;
306 		xmc[21]  = (*c >> 4) & 0x7;
307 		xmc[22]  = (*c >> 1) & 0x7;
308 		xmc[23]  = (*c++ & 0x1) << 2;
309 		xmc[23] |= (*c >> 6) & 0x3;
310 		xmc[24]  = (*c >> 3) & 0x7;
311 		xmc[25]  = *c++ & 0x7;
312 		Nc[2]  = (*c >> 1) & 0x7F;
313 		bc[2]  = (*c++ & 0x1) << 1;		/* 20 */
314 		bc[2] |= (*c >> 7) & 0x1;
315 		Mc[2]  = (*c >> 5) & 0x3;
316 		xmaxc[2]  = (*c++ & 0x1F) << 1;
317 		xmaxc[2] |= (*c >> 7) & 0x1;
318 		xmc[26]  = (*c >> 4) & 0x7;
319 		xmc[27]  = (*c >> 1) & 0x7;
320 		xmc[28]  = (*c++ & 0x1) << 2;
321 		xmc[28] |= (*c >> 6) & 0x3;
322 		xmc[29]  = (*c >> 3) & 0x7;
323 		xmc[30]  = *c++ & 0x7;
324 		xmc[31]  = (*c >> 5) & 0x7;
325 		xmc[32]  = (*c >> 2) & 0x7;
326 		xmc[33]  = (*c++ & 0x3) << 1;
327 		xmc[33] |= (*c >> 7) & 0x1;
328 		xmc[34]  = (*c >> 4) & 0x7;
329 		xmc[35]  = (*c >> 1) & 0x7;
330 		xmc[36]  = (*c++ & 0x1) << 2;
331 		xmc[36] |= (*c >> 6) & 0x3;
332 		xmc[37]  = (*c >> 3) & 0x7;
333 		xmc[38]  = *c++ & 0x7;
334 		Nc[3]  = (*c >> 1) & 0x7F;
335 		bc[3]  = (*c++ & 0x1) << 1;
336 		bc[3] |= (*c >> 7) & 0x1;
337 		Mc[3]  = (*c >> 5) & 0x3;
338 		xmaxc[3]  = (*c++ & 0x1F) << 1;
339 		xmaxc[3] |= (*c >> 7) & 0x1;
340 		xmc[39]  = (*c >> 4) & 0x7;
341 		xmc[40]  = (*c >> 1) & 0x7;
342 		xmc[41]  = (*c++ & 0x1) << 2;
343 		xmc[41] |= (*c >> 6) & 0x3;
344 		xmc[42]  = (*c >> 3) & 0x7;
345 		xmc[43]  = *c++ & 0x7;			/* 30  */
346 		xmc[44]  = (*c >> 5) & 0x7;
347 		xmc[45]  = (*c >> 2) & 0x7;
348 		xmc[46]  = (*c++ & 0x3) << 1;
349 		xmc[46] |= (*c >> 7) & 0x1;
350 		xmc[47]  = (*c >> 4) & 0x7;
351 		xmc[48]  = (*c >> 1) & 0x7;
352 		xmc[49]  = (*c++ & 0x1) << 2;
353 		xmc[49] |= (*c >> 6) & 0x3;
354 		xmc[50]  = (*c >> 3) & 0x7;
355 		xmc[51]  = *c & 0x7;			/* 33 */
356 	}
357 
358 	Gsm_Decoder(s, LARc, Nc, bc, Mc, xmaxc, xmc, target);
359 
360 	return 0;
361 }
362