aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/isdn/mISDN/dsp_tones.c
blob: 1debf53670de6408f98ddbbbacd681a0cef9b93f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
/*
 * Audio support data for ISDN4Linux.
 *
 * Copyright Andreas Eversberg (jolly@eversberg.eu)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/mISDNif.h>
#include <linux/mISDNdsp.h>
#include "core.h"
#include "dsp.h"


#define DATA_S sample_silence
#define SIZE_S (&sizeof_silence)
#define DATA_GA sample_german_all
#define SIZE_GA (&sizeof_german_all)
#define DATA_GO sample_german_old
#define SIZE_GO (&sizeof_german_old)
#define DATA_DT sample_american_dialtone
#define SIZE_DT (&sizeof_american_dialtone)
#define DATA_RI sample_american_ringing
#define SIZE_RI (&sizeof_american_ringing)
#define DATA_BU sample_american_busy
#define SIZE_BU (&sizeof_american_busy)
#define DATA_S1 sample_special1
#define SIZE_S1 (&sizeof_special1)
#define DATA_S2 sample_special2
#define SIZE_S2 (&sizeof_special2)
#define DATA_S3 sample_special3
#define SIZE_S3 (&sizeof_special3)

/***************/
/* tones loops */
/***************/

/* all tones are alaw encoded */
/* the last sample+1 is in phase with the first sample. the error is low */

static u8 sample_german_all[] = {
	0x80, 0xab, 0x81, 0x6d, 0xfd, 0xdd, 0x5d, 0x9d,
	0x4d, 0xd1, 0x89, 0x88, 0xd0, 0x4c, 0x9c, 0x5c,
	0xdc, 0xfc, 0x6c,
	0x80, 0xab, 0x81, 0x6d, 0xfd, 0xdd, 0x5d, 0x9d,
	0x4d, 0xd1, 0x89, 0x88, 0xd0, 0x4c, 0x9c, 0x5c,
	0xdc, 0xfc, 0x6c,
	0x80, 0xab, 0x81, 0x6d, 0xfd, 0xdd, 0x5d, 0x9d,
	0x4d, 0xd1, 0x89, 0x88, 0xd0, 0x4c, 0x9c, 0x5c,
	0xdc, 0xfc, 0x6c,
	0x80, 0xab, 0x81, 0x6d, 0xfd, 0xdd, 0x5d, 0x9d,
	0x4d, 0xd1, 0x89, 0x88, 0xd0, 0x4c, 0x9c, 0x5c,
	0xdc, 0xfc, 0x6c,
};
static u32 sizeof_german_all = sizeof(sample_german_all);

static u8 sample_german_old[] = {
	0xec, 0x68, 0xe1, 0x6d, 0x6d, 0x91, 0x51, 0xed,
	0x6d, 0x01, 0x1e, 0x10, 0x0c, 0x90, 0x60, 0x70,
	0x8c,
	0xec, 0x68, 0xe1, 0x6d, 0x6d, 0x91, 0x51, 0xed,
	0x6d, 0x01, 0x1e, 0x10, 0x0c, 0x90, 0x60, 0x70,
	0x8c,
	0xec, 0x68, 0xe1, 0x6d, 0x6d, 0x91, 0x51, 0xed,
	0x6d, 0x01, 0x1e, 0x10, 0x0c, 0x90, 0x60, 0x70,
	0x8c,
	0xec, 0x68, 0xe1, 0x6d, 0x6d, 0x91, 0x51, 0xed,
	0x6d, 0x01, 0x1e, 0x10, 0x0c, 0x90, 0x60, 0x70,
	0x8c,
};
static u32 sizeof_german_old = sizeof(sample_german_old);

static u8 sample_american_dialtone[] = {
	0x2a, 0x18, 0x90, 0x6c, 0x4c, 0xbc, 0x4c, 0x6c,
	0x10, 0x58, 0x32, 0xb9, 0x31, 0x2d, 0x8d, 0x0d,
	0x8d, 0x2d, 0x31, 0x99, 0x0f, 0x28, 0x60, 0xf0,
	0xd0, 0x50, 0xd0, 0x30, 0x60, 0x08, 0x8e, 0x67,
	0x09, 0x19, 0x21, 0xe1, 0xd9, 0xb9, 0x29, 0x67,
	0x83, 0x02, 0xce, 0xbe, 0xee, 0x1a, 0x1b, 0xef,
	0xbf, 0xcf, 0x03, 0x82, 0x66, 0x28, 0xb8, 0xd8,
	0xe0, 0x20, 0x18, 0x08, 0x66, 0x8f, 0x09, 0x61,
	0x31, 0xd1, 0x51, 0xd1, 0xf1, 0x61, 0x29, 0x0e,
	0x98, 0x30, 0x2c, 0x8c, 0x0c, 0x8c, 0x2c, 0x30,
	0xb8, 0x33, 0x59, 0x11, 0x6d, 0x4d, 0xbd, 0x4d,
	0x6d, 0x91, 0x19,
};
static u32 sizeof_american_dialtone = sizeof(sample_american_dialtone);

static u8 sample_american_ringing[] = {
	0x2a, 0xe0, 0xac, 0x0c, 0xbc, 0x4c, 0x8c, 0x90,
	0x48, 0xc7, 0xc1, 0xed, 0xcd, 0x4d, 0xcd, 0xed,
	0xc1, 0xb7, 0x08, 0x30, 0xec, 0xcc, 0xcc, 0x8c,
	0x10, 0x58, 0x1a, 0x99, 0x71, 0xed, 0x8d, 0x8d,
	0x2d, 0x41, 0x89, 0x9e, 0x20, 0x70, 0x2c, 0xec,
	0x2c, 0x70, 0x20, 0x86, 0x77, 0xe1, 0x31, 0x11,
	0xd1, 0xf1, 0x81, 0x09, 0xa3, 0x56, 0x58, 0x00,
	0x40, 0xc0, 0x60, 0x38, 0x46, 0x43, 0x57, 0x39,
	0xd9, 0x59, 0x99, 0xc9, 0x77, 0x2f, 0x2e, 0xc6,
	0xd6, 0x28, 0xd6, 0x36, 0x26, 0x2e, 0x8a, 0xa3,
	0x43, 0x63, 0x4b, 0x4a, 0x62, 0x42, 0xa2, 0x8b,
	0x2f, 0x27, 0x37, 0xd7, 0x29, 0xd7, 0xc7, 0x2f,
	0x2e, 0x76, 0xc8, 0x98, 0x58, 0xd8, 0x38, 0x56,
	0x42, 0x47, 0x39, 0x61, 0xc1, 0x41, 0x01, 0x59,
	0x57, 0xa2, 0x08, 0x80, 0xf0, 0xd0, 0x10, 0x30,
	0xe0, 0x76, 0x87, 0x21, 0x71, 0x2d, 0xed, 0x2d,
	0x71, 0x21, 0x9f, 0x88, 0x40, 0x2c, 0x8c, 0x8c,
	0xec, 0x70, 0x98, 0x1b, 0x59, 0x11, 0x8d, 0xcd,
	0xcd, 0xed, 0x31, 0x09, 0xb6, 0xc0, 0xec, 0xcc,
	0x4c, 0xcc, 0xec, 0xc0, 0xc6, 0x49, 0x91, 0x8d,
	0x4d, 0xbd, 0x0d, 0xad, 0xe1,
};
static u32 sizeof_american_ringing = sizeof(sample_american_ringing);

static u8 sample_american_busy[] = {
	0x2a, 0x00, 0x6c, 0x4c, 0x4c, 0x6c, 0xb0, 0x66,
	0x99, 0x11, 0x6d, 0x8d, 0x2d, 0x41, 0xd7, 0x96,
	0x60, 0xf0, 0x70, 0x40, 0x58, 0xf6, 0x53, 0x57,
	0x09, 0x89, 0xd7, 0x5f, 0xe3, 0x2a, 0xe3, 0x5f,
	0xd7, 0x89, 0x09, 0x57, 0x53, 0xf6, 0x58, 0x40,
	0x70, 0xf0, 0x60, 0x96, 0xd7, 0x41, 0x2d, 0x8d,
	0x6d, 0x11, 0x99, 0x66, 0xb0, 0x6c, 0x4c, 0x4c,
	0x6c, 0x00, 0x2a, 0x01, 0x6d, 0x4d, 0x4d, 0x6d,
	0xb1, 0x67, 0x98, 0x10, 0x6c, 0x8c, 0x2c, 0x40,
	0xd6, 0x97, 0x61, 0xf1, 0x71, 0x41, 0x59, 0xf7,
	0x52, 0x56, 0x08, 0x88, 0xd6, 0x5e, 0xe2, 0x2a,
	0xe2, 0x5e, 0xd6, 0x88, 0x08, 0x56, 0x52, 0xf7,
	0x59, 0x41, 0x71, 0xf1, 0x61, 0x97, 0xd6, 0x40,
	0x2c, 0x8c, 0x6c, 0x10, 0x98, 0x67, 0xb1, 0x6d,
	0x4d, 0x4d, 0x6d, 0x01,
};
static u32 sizeof_american_busy = sizeof(sample_american_busy);

static u8 sample_special1[] = {
	0x2a, 0x2c, 0xbc, 0x6c, 0xd6, 0x71, 0xbd, 0x0d,
	0xd9, 0x80, 0xcc, 0x4c, 0x40, 0x39, 0x0d, 0xbd,
	0x11, 0x86, 0xec, 0xbc, 0xec, 0x0e, 0x51, 0xbd,
	0x8d, 0x89, 0x30, 0x4c, 0xcc, 0xe0, 0xe1, 0xcd,
	0x4d, 0x31, 0x88, 0x8c, 0xbc, 0x50, 0x0f, 0xed,
	0xbd, 0xed, 0x87, 0x10, 0xbc, 0x0c, 0x38, 0x41,
	0x4d, 0xcd, 0x81, 0xd8, 0x0c, 0xbc, 0x70, 0xd7,
	0x6d, 0xbd, 0x2d,
};
static u32 sizeof_special1 = sizeof(sample_special1);

static u8 sample_special2[] = {
	0x2a, 0xcc, 0x8c, 0xd7, 0x4d, 0x2d, 0x18, 0xbc,
	0x10, 0xc1, 0xbd, 0xc1, 0x10, 0xbc, 0x18, 0x2d,
	0x4d, 0xd7, 0x8c, 0xcc, 0x2a, 0xcd, 0x8d, 0xd6,
	0x4c, 0x2c, 0x19, 0xbd, 0x11, 0xc0, 0xbc, 0xc0,
	0x11, 0xbd, 0x19, 0x2c, 0x4c, 0xd6, 0x8d, 0xcd,
	0x2a, 0xcc, 0x8c, 0xd7, 0x4d, 0x2d, 0x18, 0xbc,
	0x10, 0xc1, 0xbd, 0xc1, 0x10, 0xbc, 0x18, 0x2d,
	0x4d, 0xd7, 0x8c, 0xcc, 0x2a, 0xcd, 0x8d, 0xd6,
	0x4c, 0x2c, 0x19, 0xbd, 0x11, 0xc0, 0xbc, 0xc0,
	0x11, 0xbd, 0x19, 0x2c, 0x4c, 0xd6, 0x8d, 0xcd,
};
static u32 sizeof_special2 = sizeof(sample_special2);

static u8 sample_special3[] = {
	0x2a, 0xbc, 0x18, 0xcd, 0x11, 0x2c, 0x8c, 0xc1,
	0x4d, 0xd6, 0xbc, 0xd6, 0x4d, 0xc1, 0x8c, 0x2c,
	0x11, 0xcd, 0x18, 0xbc, 0x2a, 0xbd, 0x19, 0xcc,
	0x10, 0x2d, 0x8d, 0xc0, 0x4c, 0xd7, 0xbd, 0xd7,
	0x4c, 0xc0, 0x8d, 0x2d, 0x10, 0xcc, 0x19, 0xbd,
	0x2a, 0xbc, 0x18, 0xcd, 0x11, 0x2c, 0x8c, 0xc1,
	0x4d, 0xd6, 0xbc, 0xd6, 0x4d, 0xc1, 0x8c, 0x2c,
	0x11, 0xcd, 0x18, 0xbc, 0x2a, 0xbd, 0x19, 0xcc,
	0x10, 0x2d, 0x8d, 0xc0, 0x4c, 0xd7, 0xbd, 0xd7,
	0x4c, 0xc0, 0x8d, 0x2d, 0x10, 0xcc, 0x19, 0xbd,
};
static u32 sizeof_special3 = sizeof(sample_special3);

static u8 sample_silence[] = {
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
	0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a,
};
static u32 sizeof_silence = sizeof(sample_silence);

struct tones_samples {
	u32 *len;
	u8 *data;
};
static struct
tones_samples samples[] = {
	{&sizeof_german_all, sample_german_all},
	{&sizeof_german_old, sample_german_old},
	{&sizeof_american_dialtone, sample_american_dialtone},
	{&sizeof_american_ringing, sample_american_ringing},
	{&sizeof_american_busy, sample_american_busy},
	{&sizeof_special1, sample_special1},
	{&sizeof_special2, sample_special2},
	{&sizeof_special3, sample_special3},
	{NULL, NULL},
};

/***********************************
 * generate ulaw from alaw samples *
 ***********************************/

void
dsp_audio_generate_ulaw_samples(void)
{
	int i, j;

	i = 0;
	while (samples[i].len) {
		j = 0;
		while (j < (*samples[i].len)) {
			samples[i].data[j] =
				dsp_audio_alaw_to_ulaw[samples[i].data[j]];
			j++;
		}
		i++;
	}
}


/****************************
 * tone sequence definition *
 ****************************/

static struct pattern {
	int tone;
	u8 *data[10];
	u32 *siz[10];
	u32 seq[10];
} pattern[] = {
	{TONE_GERMAN_DIALTONE,
	{DATA_GA, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GA, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{1900, 0, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_GERMAN_OLDDIALTONE,
	{DATA_GO, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GO, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{1998, 0, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_AMERICAN_DIALTONE,
	{DATA_DT, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_DT, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{8000, 0, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_GERMAN_DIALPBX,
	{DATA_GA, DATA_S, DATA_GA, DATA_S, DATA_GA, DATA_S, NULL, NULL, NULL,
		NULL},
	{SIZE_GA, SIZE_S, SIZE_GA, SIZE_S, SIZE_GA, SIZE_S, NULL, NULL, NULL,
		NULL},
	{2000, 2000, 2000, 2000, 2000, 12000, 0, 0, 0, 0} },

	{TONE_GERMAN_OLDDIALPBX,
	{DATA_GO, DATA_S, DATA_GO, DATA_S, DATA_GO, DATA_S, NULL, NULL, NULL,
		NULL},
	{SIZE_GO, SIZE_S, SIZE_GO, SIZE_S, SIZE_GO, SIZE_S, NULL, NULL, NULL,
		NULL},
	{2000, 2000, 2000, 2000, 2000, 12000, 0, 0, 0, 0} },

	{TONE_AMERICAN_DIALPBX,
	{DATA_DT, DATA_S, DATA_DT, DATA_S, DATA_DT, DATA_S, NULL, NULL, NULL,
		NULL},
	{SIZE_DT, SIZE_S, SIZE_DT, SIZE_S, SIZE_DT, SIZE_S, NULL, NULL, NULL,
		NULL},
	{2000, 2000, 2000, 2000, 2000, 12000, 0, 0, 0, 0} },

	{TONE_GERMAN_RINGING,
	{DATA_GA, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GA, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{8000, 32000, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_GERMAN_OLDRINGING,
	{DATA_GO, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GO, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{8000, 40000, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_AMERICAN_RINGING,
	{DATA_RI, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_RI, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{8000, 32000, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_GERMAN_RINGPBX,
	{DATA_GA, DATA_S, DATA_GA, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GA, SIZE_S, SIZE_GA, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL},
	{4000, 4000, 4000, 28000, 0, 0, 0, 0, 0, 0} },

	{TONE_GERMAN_OLDRINGPBX,
	{DATA_GO, DATA_S, DATA_GO, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GO, SIZE_S, SIZE_GO, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL},
	{4000, 4000, 4000, 28000, 0, 0, 0, 0, 0, 0} },

	{TONE_AMERICAN_RINGPBX,
	{DATA_RI, DATA_S, DATA_RI, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_RI, SIZE_S, SIZE_RI, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL},
	{4000, 4000, 4000, 28000, 0, 0, 0, 0, 0, 0} },

	{TONE_GERMAN_BUSY,
	{DATA_GA, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GA, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{4000, 4000, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_GERMAN_OLDBUSY,
	{DATA_GO, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GO, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{1000, 5000, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_AMERICAN_BUSY,
	{DATA_BU, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_BU, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{4000, 4000, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_GERMAN_HANGUP,
	{DATA_GA, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GA, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{4000, 4000, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_GERMAN_OLDHANGUP,
	{DATA_GO, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GO, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{1000, 5000, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_AMERICAN_HANGUP,
	{DATA_DT, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_DT, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{8000, 0, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_SPECIAL_INFO,
	{DATA_S1, DATA_S2, DATA_S3, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_S1, SIZE_S2, SIZE_S3, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL},
	{2666, 2666, 2666, 8002, 0, 0, 0, 0, 0, 0} },

	{TONE_GERMAN_GASSENBESETZT,
	{DATA_GA, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GA, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{2000, 2000, 0, 0, 0, 0, 0, 0, 0, 0} },

	{TONE_GERMAN_AUFSCHALTTON,
	{DATA_GO, DATA_S, DATA_GO, DATA_S, NULL, NULL, NULL, NULL, NULL, NULL},
	{SIZE_GO, SIZE_S, SIZE_GO, SIZE_S, NULL, NULL, NULL, NULL, NULL, NULL},
	{1000, 5000, 1000, 17000, 0, 0, 0, 0, 0, 0} },

	{0,
	{NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
	{0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
};

/******************
 * copy tone data *
 ******************/

/* an sk_buff is generated from the number of samples needed.
 * the count will be changed and may begin from 0 each pattern period.
 * the clue is to precalculate the pointers and legths to use only one
 * memcpy per function call, or two memcpy if the tone sequence changes.
 *
 * pattern - the type of the pattern
 * count - the sample from the beginning of the pattern (phase)
 * len - the number of bytes
 *
 * return - the sk_buff with the sample
 *
 * if tones has finished (e.g. knocking tone), dsp->tones is turned off
 */
void dsp_tone_copy(struct dsp *dsp, u8 *data, int len)
{
	int index, count, start, num;
	struct pattern *pat;
	struct dsp_tone *tone = &dsp->tone;

	/* if we have no tone, we copy silence */
	if (!tone->tone) {
		memset(data, dsp_silence, len);
		return;
	}

	/* process pattern */
	pat = (struct pattern *)tone->pattern;
		/* points to the current pattern */
	index = tone->index; /* gives current sequence index */
	count = tone->count; /* gives current sample */

	/* copy sample */
	while (len) {
		/* find sample to start with */
		while (42) {
			/* warp arround */
			if (!pat->seq[index]) {
				count = 0;
				index = 0;
			}
			/* check if we are currently playing this tone */
			if (count < pat->seq[index])
				break;
			if (dsp_debug & DEBUG_DSP_TONE)
				printk(KERN_DEBUG "%s: reaching next sequence "
					"(index=%d)\n", __func__, index);
			count -= pat->seq[index];
			index++;
		}
		/* calculate start and number of samples */
		start = count % (*(pat->siz[index]));
		num = len;
		if (num+count > pat->seq[index])
			num = pat->seq[index] - count;
		if (num+start > (*(pat->siz[index])))
			num = (*(pat->siz[index])) - start;
		/* copy memory */
		memcpy(data, pat->data[index]+start, num);
		/* reduce length */
		data += num;
		count += num;
		len -= num;
	}
	tone->index = index;
	tone->count = count;

	/* return sk_buff */
	return;
}


/*******************************
 * send HW message to hfc card *
 *******************************/

static void
dsp_tone_hw_message(struct dsp *dsp, u8 *sample, int len)
{
	struct sk_buff *nskb;

	/* unlocking is not required, because we don't expect a response */
	nskb = _alloc_mISDN_skb(PH_CONTROL_REQ,
		(len) ? HFC_SPL_LOOP_ON : HFC_SPL_LOOP_OFF, len, sample,
		GFP_ATOMIC);
	if (nskb) {
		if (dsp->ch.peer) {
			if (dsp->ch.recv(dsp->ch.peer, nskb))
				dev_kfree_skb(nskb);
		} else
			dev_kfree_skb(nskb);
	}
}


/*****************
 * timer expires *
 *****************/
void
dsp_tone_timeout(void *arg)
{
	struct dsp *dsp = arg;
	struct dsp_tone *tone = &dsp->tone;
	struct pattern *pat = (struct pattern *)tone->pattern;
	int index = tone->index;

	if (!tone->tone)
		return;

	index++;
	if (!pat->seq[index])
		index = 0;
	tone->index = index;

	/* set next tone */
	if (pat->data[index] == DATA_S)
		dsp_tone_hw_message(dsp, NULL, 0);
	else
		dsp_tone_hw_message(dsp, pat->data[index], *(pat->siz[index]));
	/* set timer */
	init_timer(&tone->tl);
	tone->tl.expires = jiffies + (pat->seq[index] * HZ) / 8000;
	add_timer(&tone->tl);
}


/********************
 * set/release tone *
 ********************/

/*
 * tones are relaized by streaming or by special loop commands if supported
 * by hardware. when hardware is used, the patterns will be controlled by
 * timers.
 */
int
dsp_tone(struct dsp *dsp, int tone)
{
	struct pattern *pat;
	int i;
	struct dsp_tone *tonet = &dsp->tone;

	tonet->software = 0;
	tonet->hardware = 0;

	/* we turn off the tone */
	if (!tone) {
		if (dsp->features.hfc_loops && timer_pending(&tonet->tl))
			del_timer(&tonet->tl);
		if (dsp->features.hfc_loops)
			dsp_tone_hw_message(dsp, NULL, 0);
		tonet->tone = 0;
		return 0;
	}

	pat = NULL;
	i = 0;
	while (pattern[i].tone) {
		if (pattern[i].tone == tone) {
			pat = &pattern[i];
			break;
		}
		i++;
	}
	if (!pat) {
		printk(KERN_WARNING "dsp: given tone 0x%x is invalid\n", tone);
		return -EINVAL;
	}
	if (dsp_debug & DEBUG_DSP_TONE)
		printk(KERN_DEBUG "%s: now starting tone %d (index=%d)\n",
			__func__, tone, 0);
	tonet->tone = tone;
	tonet->pattern = pat;
	tonet->index = 0;
	tonet->count = 0;

	if (dsp->features.hfc_loops) {
		tonet->hardware = 1;
		/* set first tone */
		dsp_tone_hw_message(dsp, pat->data[0], *(pat->siz[0]));
		/* set timer */
		if (timer_pending(&tonet->tl))
			del_timer(&tonet->tl);
		init_timer(&tonet->tl);
		tonet->tl.expires = jiffies + (pat->seq[0] * HZ) / 8000;
		add_timer(&tonet->tl);
	} else {
		tonet->software = 1;
	}

	return 0;
}