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27#include "platform.h"
28
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36
37#include "capidtmf.h"
38
39
40
41#define FILE_ "CAPIDTMF.C"
42
43
44
45
46#define trace(a)
47
48
49
50
51
52static short capidtmf_expand_table_alaw[0x0100] =
53{
54 -5504, 5504, -344, 344, -22016, 22016, -1376, 1376,
55 -2752, 2752, -88, 88, -11008, 11008, -688, 688,
56 -7552, 7552, -472, 472, -30208, 30208, -1888, 1888,
57 -3776, 3776, -216, 216, -15104, 15104, -944, 944,
58 -4480, 4480, -280, 280, -17920, 17920, -1120, 1120,
59 -2240, 2240, -24, 24, -8960, 8960, -560, 560,
60 -6528, 6528, -408, 408, -26112, 26112, -1632, 1632,
61 -3264, 3264, -152, 152, -13056, 13056, -816, 816,
62 -6016, 6016, -376, 376, -24064, 24064, -1504, 1504,
63 -3008, 3008, -120, 120, -12032, 12032, -752, 752,
64 -8064, 8064, -504, 504, -32256, 32256, -2016, 2016,
65 -4032, 4032, -248, 248, -16128, 16128, -1008, 1008,
66 -4992, 4992, -312, 312, -19968, 19968, -1248, 1248,
67 -2496, 2496, -56, 56, -9984, 9984, -624, 624,
68 -7040, 7040, -440, 440, -28160, 28160, -1760, 1760,
69 -3520, 3520, -184, 184, -14080, 14080, -880, 880,
70 -5248, 5248, -328, 328, -20992, 20992, -1312, 1312,
71 -2624, 2624, -72, 72, -10496, 10496, -656, 656,
72 -7296, 7296, -456, 456, -29184, 29184, -1824, 1824,
73 -3648, 3648, -200, 200, -14592, 14592, -912, 912,
74 -4224, 4224, -264, 264, -16896, 16896, -1056, 1056,
75 -2112, 2112, -8, 8, -8448, 8448, -528, 528,
76 -6272, 6272, -392, 392, -25088, 25088, -1568, 1568,
77 -3136, 3136, -136, 136, -12544, 12544, -784, 784,
78 -5760, 5760, -360, 360, -23040, 23040, -1440, 1440,
79 -2880, 2880, -104, 104, -11520, 11520, -720, 720,
80 -7808, 7808, -488, 488, -31232, 31232, -1952, 1952,
81 -3904, 3904, -232, 232, -15616, 15616, -976, 976,
82 -4736, 4736, -296, 296, -18944, 18944, -1184, 1184,
83 -2368, 2368, -40, 40, -9472, 9472, -592, 592,
84 -6784, 6784, -424, 424, -27136, 27136, -1696, 1696,
85 -3392, 3392, -168, 168, -13568, 13568, -848, 848
86};
87
88static short capidtmf_expand_table_ulaw[0x0100] =
89{
90 -32124, 32124, -1884, 1884, -7932, 7932, -372, 372,
91 -15996, 15996, -876, 876, -3900, 3900, -120, 120,
92 -23932, 23932, -1372, 1372, -5884, 5884, -244, 244,
93 -11900, 11900, -620, 620, -2876, 2876, -56, 56,
94 -28028, 28028, -1628, 1628, -6908, 6908, -308, 308,
95 -13948, 13948, -748, 748, -3388, 3388, -88, 88,
96 -19836, 19836, -1116, 1116, -4860, 4860, -180, 180,
97 -9852, 9852, -492, 492, -2364, 2364, -24, 24,
98 -30076, 30076, -1756, 1756, -7420, 7420, -340, 340,
99 -14972, 14972, -812, 812, -3644, 3644, -104, 104,
100 -21884, 21884, -1244, 1244, -5372, 5372, -212, 212,
101 -10876, 10876, -556, 556, -2620, 2620, -40, 40,
102 -25980, 25980, -1500, 1500, -6396, 6396, -276, 276,
103 -12924, 12924, -684, 684, -3132, 3132, -72, 72,
104 -17788, 17788, -988, 988, -4348, 4348, -148, 148,
105 -8828, 8828, -428, 428, -2108, 2108, -8, 8,
106 -31100, 31100, -1820, 1820, -7676, 7676, -356, 356,
107 -15484, 15484, -844, 844, -3772, 3772, -112, 112,
108 -22908, 22908, -1308, 1308, -5628, 5628, -228, 228,
109 -11388, 11388, -588, 588, -2748, 2748, -48, 48,
110 -27004, 27004, -1564, 1564, -6652, 6652, -292, 292,
111 -13436, 13436, -716, 716, -3260, 3260, -80, 80,
112 -18812, 18812, -1052, 1052, -4604, 4604, -164, 164,
113 -9340, 9340, -460, 460, -2236, 2236, -16, 16,
114 -29052, 29052, -1692, 1692, -7164, 7164, -324, 324,
115 -14460, 14460, -780, 780, -3516, 3516, -96, 96,
116 -20860, 20860, -1180, 1180, -5116, 5116, -196, 196,
117 -10364, 10364, -524, 524, -2492, 2492, -32, 32,
118 -24956, 24956, -1436, 1436, -6140, 6140, -260, 260,
119 -12412, 12412, -652, 652, -3004, 3004, -64, 64,
120 -16764, 16764, -924, 924, -4092, 4092, -132, 132,
121 -8316, 8316, -396, 396, -1980, 1980, 0, 0
122};
123
124
125
126
127static short capidtmf_recv_window_function[CAPIDTMF_RECV_ACCUMULATE_CYCLES] =
128{
129 -500L, -999L, -1499L, -1998L, -2496L, -2994L, -3491L, -3988L,
130 -4483L, -4978L, -5471L, -5963L, -6454L, -6943L, -7431L, -7917L,
131 -8401L, -8883L, -9363L, -9840L, -10316L, -10789L, -11259L, -11727L,
132 -12193L, -12655L, -13115L, -13571L, -14024L, -14474L, -14921L, -15364L,
133 -15804L, -16240L, -16672L, -17100L, -17524L, -17944L, -18360L, -18772L,
134 -19180L, -19583L, -19981L, -20375L, -20764L, -21148L, -21527L, -21901L,
135 -22270L, -22634L, -22993L, -23346L, -23694L, -24037L, -24374L, -24705L,
136 -25030L, -25350L, -25664L, -25971L, -26273L, -26568L, -26858L, -27141L,
137 -27418L, -27688L, -27952L, -28210L, -28461L, -28705L, -28943L, -29174L,
138 -29398L, -29615L, -29826L, -30029L, -30226L, -30415L, -30598L, -30773L,
139 -30941L, -31102L, -31256L, -31402L, -31541L, -31673L, -31797L, -31914L,
140 -32024L, -32126L, -32221L, -32308L, -32388L, -32460L, -32524L, -32581L,
141 -32631L, -32673L, -32707L, -32734L, -32753L, -32764L, -32768L, -32764L,
142 -32753L, -32734L, -32707L, -32673L, -32631L, -32581L, -32524L, -32460L,
143 -32388L, -32308L, -32221L, -32126L, -32024L, -31914L, -31797L, -31673L,
144 -31541L, -31402L, -31256L, -31102L, -30941L, -30773L, -30598L, -30415L,
145 -30226L, -30029L, -29826L, -29615L, -29398L, -29174L, -28943L, -28705L,
146 -28461L, -28210L, -27952L, -27688L, -27418L, -27141L, -26858L, -26568L,
147 -26273L, -25971L, -25664L, -25350L, -25030L, -24705L, -24374L, -24037L,
148 -23694L, -23346L, -22993L, -22634L, -22270L, -21901L, -21527L, -21148L,
149 -20764L, -20375L, -19981L, -19583L, -19180L, -18772L, -18360L, -17944L,
150 -17524L, -17100L, -16672L, -16240L, -15804L, -15364L, -14921L, -14474L,
151 -14024L, -13571L, -13115L, -12655L, -12193L, -11727L, -11259L, -10789L,
152 -10316L, -9840L, -9363L, -8883L, -8401L, -7917L, -7431L, -6943L,
153 -6454L, -5963L, -5471L, -4978L, -4483L, -3988L, -3491L, -2994L,
154 -2496L, -1998L, -1499L, -999L, -500L,
155};
156
157static byte capidtmf_leading_zeroes_table[0x100] =
158{
159 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
160 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
161 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
162 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
163 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
164 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
165 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
166 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
167 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
168 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
169 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
170 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
171 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
172 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
173 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
174 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
175};
176
177#define capidtmf_byte_leading_zeroes(b) (capidtmf_leading_zeroes_table[(BYTE)(b)])
178#define capidtmf_word_leading_zeroes(w) (((w) & 0xff00) ? capidtmf_leading_zeroes_table[(w) >> 8] : 8 + capidtmf_leading_zeroes_table[(w)])
179#define capidtmf_dword_leading_zeroes(d) (((d) & 0xffff0000L) ? (((d) & 0xff000000L) ? capidtmf_leading_zeroes_table[(d) >> 24] : 8 + capidtmf_leading_zeroes_table[(d) >> 16]) : (((d) & 0xff00) ? 16 + capidtmf_leading_zeroes_table[(d) >> 8] : 24 + capidtmf_leading_zeroes_table[(d)]))
180
181
182
183
184
185static void capidtmf_goertzel_loop (long *buffer, long *coeffs, short *sample, long count)
186{
187 int i, j;
188 long c, d, q0, q1, q2;
189
190 for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT - 1; i++)
191 {
192 q1 = buffer[i];
193 q2 = buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];
194 d = coeffs[i] >> 1;
195 c = d << 1;
196 if (c >= 0)
197 {
198 for (j = 0; j < count; j++)
199 {
200 q0 = sample[j] - q2 + (c * (q1 >> 16)) + (((dword)(((dword) d) * ((dword)(q1 & 0xffff)))) >> 15);
201 q2 = q1;
202 q1 = q0;
203 }
204 }
205 else
206 {
207 c = -c;
208 d = -d;
209 for (j = 0; j < count; j++)
210 {
211 q0 = sample[j] - q2 - ((c * (q1 >> 16)) + (((dword)(((dword) d) * ((dword)(q1 & 0xffff)))) >> 15));
212 q2 = q1;
213 q1 = q0;
214 }
215 }
216 buffer[i] = q1;
217 buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = q2;
218 }
219 q1 = buffer[i];
220 q2 = buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];
221 c = (coeffs[i] >> 1) << 1;
222 if (c >= 0)
223 {
224 for (j = 0; j < count; j++)
225 {
226 q0 = sample[j] - q2 + (c * (q1 >> 16)) + (((dword)(((dword)(c >> 1)) * ((dword)(q1 & 0xffff)))) >> 15);
227 q2 = q1;
228 q1 = q0;
229 c -= CAPIDTMF_RECV_FUNDAMENTAL_DECREMENT;
230 }
231 }
232 else
233 {
234 c = -c;
235 for (j = 0; j < count; j++)
236 {
237 q0 = sample[j] - q2 - ((c * (q1 >> 16)) + (((dword)(((dword)(c >> 1)) * ((dword)(q1 & 0xffff)))) >> 15));
238 q2 = q1;
239 q1 = q0;
240 c += CAPIDTMF_RECV_FUNDAMENTAL_DECREMENT;
241 }
242 }
243 coeffs[i] = c;
244 buffer[i] = q1;
245 buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = q2;
246}
247
248
249static void capidtmf_goertzel_result (long *buffer, long *coeffs)
250{
251 int i;
252 long d, e, q1, q2, lo, mid, hi;
253 dword k;
254
255 for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++)
256 {
257 q1 = buffer[i];
258 q2 = buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];
259 d = coeffs[i] >> 1;
260 if (d >= 0)
261 d = ((d << 1) * (-q1 >> 16)) + (((dword)(((dword) d) * ((dword)(-q1 & 0xffff)))) >> 15);
262 else
263 d = ((-d << 1) * (-q1 >> 16)) + (((dword)(((dword) -d) * ((dword)(-q1 & 0xffff)))) >> 15);
264 e = (q2 >= 0) ? q2 : -q2;
265 if (d >= 0)
266 {
267 k = ((dword)(d & 0xffff)) * ((dword)(e & 0xffff));
268 lo = k & 0xffff;
269 mid = k >> 16;
270 k = ((dword)(d >> 16)) * ((dword)(e & 0xffff));
271 mid += k & 0xffff;
272 hi = k >> 16;
273 k = ((dword)(d & 0xffff)) * ((dword)(e >> 16));
274 mid += k & 0xffff;
275 hi += k >> 16;
276 hi += ((dword)(d >> 16)) * ((dword)(e >> 16));
277 }
278 else
279 {
280 d = -d;
281 k = ((dword)(d & 0xffff)) * ((dword)(e & 0xffff));
282 lo = -((long)(k & 0xffff));
283 mid = -((long)(k >> 16));
284 k = ((dword)(d >> 16)) * ((dword)(e & 0xffff));
285 mid -= k & 0xffff;
286 hi = -((long)(k >> 16));
287 k = ((dword)(d & 0xffff)) * ((dword)(e >> 16));
288 mid -= k & 0xffff;
289 hi -= k >> 16;
290 hi -= ((dword)(d >> 16)) * ((dword)(e >> 16));
291 }
292 if (q2 < 0)
293 {
294 lo = -lo;
295 mid = -mid;
296 hi = -hi;
297 }
298 d = (q1 >= 0) ? q1 : -q1;
299 k = ((dword)(d & 0xffff)) * ((dword)(d & 0xffff));
300 lo += k & 0xffff;
301 mid += k >> 16;
302 k = ((dword)(d >> 16)) * ((dword)(d & 0xffff));
303 mid += (k & 0xffff) << 1;
304 hi += (k >> 16) << 1;
305 hi += ((dword)(d >> 16)) * ((dword)(d >> 16));
306 d = (q2 >= 0) ? q2 : -q2;
307 k = ((dword)(d & 0xffff)) * ((dword)(d & 0xffff));
308 lo += k & 0xffff;
309 mid += k >> 16;
310 k = ((dword)(d >> 16)) * ((dword)(d & 0xffff));
311 mid += (k & 0xffff) << 1;
312 hi += (k >> 16) << 1;
313 hi += ((dword)(d >> 16)) * ((dword)(d >> 16));
314 mid += lo >> 16;
315 hi += mid >> 16;
316 buffer[i] = (lo & 0xffff) | (mid << 16);
317 buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = hi;
318 }
319}
320
321
322
323
324#define CAPIDTMF_RECV_GUARD_SNR_INDEX_697 0
325#define CAPIDTMF_RECV_GUARD_SNR_INDEX_770 1
326#define CAPIDTMF_RECV_GUARD_SNR_INDEX_852 2
327#define CAPIDTMF_RECV_GUARD_SNR_INDEX_941 3
328#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1209 4
329#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1336 5
330#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1477 6
331#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1633 7
332#define CAPIDTMF_RECV_GUARD_SNR_INDEX_635 8
333#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1010 9
334#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1140 10
335#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1272 11
336#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1405 12
337#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1555 13
338#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1715 14
339#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1875 15
340
341#define CAPIDTMF_RECV_GUARD_SNR_DONTCARE 0xc000
342#define CAPIDTMF_RECV_NO_DIGIT 0xff
343#define CAPIDTMF_RECV_TIME_GRANULARITY (CAPIDTMF_RECV_ACCUMULATE_CYCLES + 1)
344
345#define CAPIDTMF_RECV_INDICATION_DIGIT 0x0001
346
347static long capidtmf_recv_goertzel_coef_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] =
348{
349 0xda97L * 2,
350 0xd299L * 2,
351 0xc8cbL * 2,
352 0xbd36L * 2,
353 0x9501L * 2,
354 0x7f89L * 2,
355 0x6639L * 2,
356 0x48c6L * 2,
357 0xe14cL * 2,
358 0xb2e0L * 2,
359 0xa1a0L * 2,
360 0x8a87L * 2,
361 0x7353L * 2,
362 0x583bL * 2,
363 0x37d8L * 2,
364 0x0000L * 2
365};
366
367
368static word capidtmf_recv_guard_snr_low_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] =
369{
370 14,
371 14,
372 16,
373 16,
374 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
375 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
376 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
377 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
378 14,
379 16,
380 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
381 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
382 DSPDTMF_RX_HARMONICS_SEL_DEFAULT - 8,
383 DSPDTMF_RX_HARMONICS_SEL_DEFAULT - 4,
384 DSPDTMF_RX_HARMONICS_SEL_DEFAULT - 4,
385 12
386};
387
388
389static word capidtmf_recv_guard_snr_high_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] =
390{
391 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
392 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
393 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
394 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
395 20,
396 20,
397 20,
398 20,
399 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
400 CAPIDTMF_RECV_GUARD_SNR_DONTCARE,
401 16,
402 4,
403 6,
404 8,
405 16,
406 12
407};
408
409
410
411
412static void capidtmf_recv_init (t_capidtmf_state *p_state)
413{
414 p_state->recv.min_gap_duration = 1;
415 p_state->recv.min_digit_duration = 1;
416
417 p_state->recv.cycle_counter = 0;
418 p_state->recv.current_digit_on_time = 0;
419 p_state->recv.current_digit_off_time = 0;
420 p_state->recv.current_digit_value = CAPIDTMF_RECV_NO_DIGIT;
421
422 p_state->recv.digit_write_pos = 0;
423 p_state->recv.digit_read_pos = 0;
424 p_state->recv.indication_state = 0;
425 p_state->recv.indication_state_ack = 0;
426 p_state->recv.state = CAPIDTMF_RECV_STATE_IDLE;
427}
428
429
430void capidtmf_recv_enable (t_capidtmf_state *p_state, word min_digit_duration, word min_gap_duration)
431{
432 p_state->recv.indication_state_ack &= CAPIDTMF_RECV_INDICATION_DIGIT;
433 p_state->recv.min_digit_duration = (word)(((((dword) min_digit_duration) * 8) +
434 ((dword)(CAPIDTMF_RECV_TIME_GRANULARITY / 2))) / ((dword) CAPIDTMF_RECV_TIME_GRANULARITY));
435 if (p_state->recv.min_digit_duration <= 1)
436 p_state->recv.min_digit_duration = 1;
437 else
438 (p_state->recv.min_digit_duration)--;
439 p_state->recv.min_gap_duration =
440 (word)((((dword) min_gap_duration) * 8) / ((dword) CAPIDTMF_RECV_TIME_GRANULARITY));
441 if (p_state->recv.min_gap_duration <= 1)
442 p_state->recv.min_gap_duration = 1;
443 else
444 (p_state->recv.min_gap_duration)--;
445 p_state->recv.state |= CAPIDTMF_RECV_STATE_DTMF_ACTIVE;
446}
447
448
449void capidtmf_recv_disable (t_capidtmf_state *p_state)
450{
451 p_state->recv.state &= ~CAPIDTMF_RECV_STATE_DTMF_ACTIVE;
452 if (p_state->recv.state == CAPIDTMF_RECV_STATE_IDLE)
453 capidtmf_recv_init (p_state);
454 else
455 {
456 p_state->recv.cycle_counter = 0;
457 p_state->recv.current_digit_on_time = 0;
458 p_state->recv.current_digit_off_time = 0;
459 p_state->recv.current_digit_value = CAPIDTMF_RECV_NO_DIGIT;
460 }
461}
462
463
464word capidtmf_recv_indication (t_capidtmf_state *p_state, byte *buffer)
465{
466 word i, j, k, flags;
467
468 flags = p_state->recv.indication_state ^ p_state->recv.indication_state_ack;
469 p_state->recv.indication_state_ack ^= flags & CAPIDTMF_RECV_INDICATION_DIGIT;
470 if (p_state->recv.digit_write_pos != p_state->recv.digit_read_pos)
471 {
472 i = 0;
473 k = p_state->recv.digit_write_pos;
474 j = p_state->recv.digit_read_pos;
475 do
476 {
477 buffer[i++] = p_state->recv.digit_buffer[j];
478 j = (j == CAPIDTMF_RECV_DIGIT_BUFFER_SIZE - 1) ? 0 : j + 1;
479 } while (j != k);
480 p_state->recv.digit_read_pos = k;
481 return (i);
482 }
483 p_state->recv.indication_state_ack ^= flags;
484 return (0);
485}
486
487
488#define CAPIDTMF_RECV_WINDOWED_SAMPLES 32
489
490void capidtmf_recv_block (t_capidtmf_state *p_state, byte *buffer, word length)
491{
492 byte result_digit;
493 word sample_number, cycle_counter, n, i;
494 word low_peak, high_peak;
495 dword lo, hi;
496 byte *p;
497 short *q;
498 byte goertzel_result_buffer[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];
499 short windowed_sample_buffer[CAPIDTMF_RECV_WINDOWED_SAMPLES];
500
501
502 if (p_state->recv.state & CAPIDTMF_RECV_STATE_DTMF_ACTIVE)
503 {
504 cycle_counter = p_state->recv.cycle_counter;
505 sample_number = 0;
506 while (sample_number < length)
507 {
508 if (cycle_counter < CAPIDTMF_RECV_ACCUMULATE_CYCLES)
509 {
510 if (cycle_counter == 0)
511 {
512 for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++)
513 {
514 p_state->recv.goertzel_buffer[0][i] = 0;
515 p_state->recv.goertzel_buffer[1][i] = 0;
516 }
517 }
518 n = CAPIDTMF_RECV_ACCUMULATE_CYCLES - cycle_counter;
519 if (n > length - sample_number)
520 n = length - sample_number;
521 if (n > CAPIDTMF_RECV_WINDOWED_SAMPLES)
522 n = CAPIDTMF_RECV_WINDOWED_SAMPLES;
523 p = buffer + sample_number;
524 q = capidtmf_recv_window_function + cycle_counter;
525 if (p_state->ulaw)
526 {
527 for (i = 0; i < n; i++)
528 {
529 windowed_sample_buffer[i] =
530 (short)((capidtmf_expand_table_ulaw[p[i]] * ((long)(q[i]))) >> 15);
531 }
532 }
533 else
534 {
535 for (i = 0; i < n; i++)
536 {
537 windowed_sample_buffer[i] =
538 (short)((capidtmf_expand_table_alaw[p[i]] * ((long)(q[i]))) >> 15);
539 }
540 }
541 capidtmf_recv_goertzel_coef_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT - 1] = CAPIDTMF_RECV_FUNDAMENTAL_OFFSET;
542 capidtmf_goertzel_loop (p_state->recv.goertzel_buffer[0],
543 capidtmf_recv_goertzel_coef_table, windowed_sample_buffer, n);
544 cycle_counter += n;
545 sample_number += n;
546 }
547 else
548 {
549 capidtmf_goertzel_result (p_state->recv.goertzel_buffer[0],
550 capidtmf_recv_goertzel_coef_table);
551 for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++)
552 {
553 lo = (dword)(p_state->recv.goertzel_buffer[0][i]);
554 hi = (dword)(p_state->recv.goertzel_buffer[1][i]);
555 if (hi != 0)
556 {
557 n = capidtmf_dword_leading_zeroes (hi);
558 hi = (hi << n) | (lo >> (32 - n));
559 }
560 else
561 {
562 n = capidtmf_dword_leading_zeroes (lo);
563 hi = lo << n;
564 n += 32;
565 }
566 n = 195 - 3 * n;
567 if (hi >= 0xcb300000L)
568 n += 2;
569 else if (hi >= 0xa1450000L)
570 n++;
571 goertzel_result_buffer[i] = (byte) n;
572 }
573 low_peak = DSPDTMF_RX_SENSITIVITY_LOW_DEFAULT;
574 result_digit = CAPIDTMF_RECV_NO_DIGIT;
575 for (i = 0; i < CAPIDTMF_LOW_GROUP_FREQUENCIES; i++)
576 {
577 if (goertzel_result_buffer[i] > low_peak)
578 {
579 low_peak = goertzel_result_buffer[i];
580 result_digit = (byte) i;
581 }
582 }
583 high_peak = DSPDTMF_RX_SENSITIVITY_HIGH_DEFAULT;
584 n = CAPIDTMF_RECV_NO_DIGIT;
585 for (i = CAPIDTMF_LOW_GROUP_FREQUENCIES; i < CAPIDTMF_RECV_BASE_FREQUENCY_COUNT; i++)
586 {
587 if (goertzel_result_buffer[i] > high_peak)
588 {
589 high_peak = goertzel_result_buffer[i];
590 n = (i - CAPIDTMF_LOW_GROUP_FREQUENCIES) << 2;
591 }
592 }
593 result_digit |= (byte) n;
594 if (low_peak + DSPDTMF_RX_HIGH_EXCEEDING_LOW_DEFAULT < high_peak)
595 result_digit = CAPIDTMF_RECV_NO_DIGIT;
596 if (high_peak + DSPDTMF_RX_LOW_EXCEEDING_HIGH_DEFAULT < low_peak)
597 result_digit = CAPIDTMF_RECV_NO_DIGIT;
598 n = 0;
599 for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++)
600 {
601 if ((((short)(low_peak - goertzel_result_buffer[i] - capidtmf_recv_guard_snr_low_table[i])) < 0)
602 || (((short)(high_peak - goertzel_result_buffer[i] - capidtmf_recv_guard_snr_high_table[i])) < 0))
603 {
604 n++;
605 }
606 }
607 if (n != 2)
608 result_digit = CAPIDTMF_RECV_NO_DIGIT;
609
610 if (result_digit == CAPIDTMF_RECV_NO_DIGIT)
611 {
612 if (p_state->recv.current_digit_on_time != 0)
613 {
614 if (++(p_state->recv.current_digit_off_time) >= p_state->recv.min_gap_duration)
615 {
616 p_state->recv.current_digit_on_time = 0;
617 p_state->recv.current_digit_off_time = 0;
618 }
619 }
620 else
621 {
622 if (p_state->recv.current_digit_off_time != 0)
623 (p_state->recv.current_digit_off_time)--;
624 }
625 }
626 else
627 {
628 if ((p_state->recv.current_digit_on_time == 0)
629 && (p_state->recv.current_digit_off_time != 0))
630 {
631 (p_state->recv.current_digit_off_time)--;
632 }
633 else
634 {
635 n = p_state->recv.current_digit_off_time;
636 if ((p_state->recv.current_digit_on_time != 0)
637 && (result_digit != p_state->recv.current_digit_value))
638 {
639 p_state->recv.current_digit_on_time = 0;
640 n = 0;
641 }
642 p_state->recv.current_digit_value = result_digit;
643 p_state->recv.current_digit_off_time = 0;
644 if (p_state->recv.current_digit_on_time != 0xffff)
645 {
646 p_state->recv.current_digit_on_time += n + 1;
647 if (p_state->recv.current_digit_on_time >= p_state->recv.min_digit_duration)
648 {
649 p_state->recv.current_digit_on_time = 0xffff;
650 i = (p_state->recv.digit_write_pos == CAPIDTMF_RECV_DIGIT_BUFFER_SIZE - 1) ?
651 0 : p_state->recv.digit_write_pos + 1;
652 if (i == p_state->recv.digit_read_pos)
653 {
654 trace (dprintf ("%s,%d: Receive digit overrun",
655 (char *)(FILE_), __LINE__));
656 }
657 else
658 {
659 p_state->recv.digit_buffer[p_state->recv.digit_write_pos] = result_digit;
660 p_state->recv.digit_write_pos = i;
661 p_state->recv.indication_state =
662 (p_state->recv.indication_state & ~CAPIDTMF_RECV_INDICATION_DIGIT) |
663 (~p_state->recv.indication_state_ack & CAPIDTMF_RECV_INDICATION_DIGIT);
664 }
665 }
666 }
667 }
668 }
669 cycle_counter = 0;
670 sample_number++;
671 }
672 }
673 p_state->recv.cycle_counter = cycle_counter;
674 }
675}
676
677
678void capidtmf_init (t_capidtmf_state *p_state, byte ulaw)
679{
680 p_state->ulaw = ulaw;
681 capidtmf_recv_init (p_state);
682}
683
684
685
686
