Newer
Older
/*
* Asterisk -- A telephony toolkit for Linux.
*
* Convenience Signal Processing routines
*
* Copyright (C) 2002, Digium
*
* Mark Spencer <markster@linux-support.net>
*
* This program is free software, distributed under the terms of
* the GNU General Public License.
*
* Goertzel routines are borrowed from Steve Underwood's tremendous work on the
* DTMF detector.
*
*/
/* Some routines from tone_detect.c by Steven Underwood as published under the zapata library */
/*
tone_detect.c - General telephony tone detection, and specific
detection of DTMF.
Copyright (C) 2001 Steve Underwood <steveu@coppice.org>
Despite my general liking of the GPL, I place this code in the
public domain for the benefit of all mankind - even the slimy
ones who might try to proprietize my work and use it to my
detriment.
*/
#include <asterisk/frame.h>
#include <asterisk/channel.h>
#include <asterisk/channel_pvt.h>
#include <asterisk/logger.h>
#include <asterisk/dsp.h>
#include <asterisk/ulaw.h>
#include <asterisk/alaw.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include <errno.h>
#include <stdio.h>
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
/* Number of goertzels for progress detect */
#define GSAMP_SIZE_NA 183 /* North America - 350, 440, 480, 620, 950, 1400, 1800 Hz */
#define GSAMP_SIZE_CR 188 /* Costa Rica - Only care about 425 Hz */
#define PROG_MODE_NA 0
#define PROG_MODE_CR 1
/* For US modes */
#define HZ_350 0
#define HZ_440 1
#define HZ_480 2
#define HZ_620 3
#define HZ_950 4
#define HZ_1400 5
#define HZ_1800 6
/* For CR modes */
#define HZ_425 0
static struct progalias {
char *name;
int mode;
} aliases[] = {
{ "us", PROG_MODE_NA },
{ "ca", PROG_MODE_NA },
{ "cr", PROG_MODE_CR },
};
static struct progress {
int size;
int freqs[7];
} modes[] = {
{ GSAMP_SIZE_NA, { 350, 440, 480, 620, 950, 1400, 1800 } }, /* North America */
{ GSAMP_SIZE_CR, { 425 } },
};
Martin Pycko
committed
#define BUSY_PERCENT 10 /* The percentage diffrence between the two last silence periods */
#define BUSY_THRESHOLD 100 /* Max number of ms difference between max and min times in busy */
#define BUSY_MIN 75 /* Busy must be at least 80 ms in half-cadence */
#define BUSY_MAX 1100 /* Busy can't be longer than 1100 ms in half-cadence */
Martin Pycko
committed
/* Remember last 15 units */
#define DSP_HISTORY 15
/* Define if you want the fax detector -- NOT RECOMMENDED IN -STABLE */
#define FAX_DETECT
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
#define TONE_THRESH 10.0 /* How much louder the tone should be than channel energy */
#define TONE_MIN_THRESH 1e8 /* How much tone there should be at least to attempt */
#define COUNT_THRESH 3 /* Need at least 50ms of stuff to count it */
#define TONE_STATE_SILENCE 0
#define TONE_STATE_RINGING 1
#define TONE_STATE_DIALTONE 2
#define TONE_STATE_TALKING 3
#define TONE_STATE_BUSY 4
#define TONE_STATE_SPECIAL1 5
#define TONE_STATE_SPECIAL2 6
#define TONE_STATE_SPECIAL3 7
#define MAX_DTMF_DIGITS 128
/* Basic DTMF specs:
*
* Minimum tone on = 40ms
* Minimum tone off = 50ms
* Maximum digit rate = 10 per second
* Normal twist <= 8dB accepted
* Reverse twist <= 4dB accepted
* S/N >= 15dB will detect OK
* Attenuation <= 26dB will detect OK
* Frequency tolerance +- 1.5% will detect, +-3.5% will reject
*/
#define DTMF_THRESHOLD 8.0e7
#define FAX_THRESHOLD 8.0e7
#define FAX_2ND_HARMONIC 2.0 /* 4dB */
#define DTMF_NORMAL_TWIST 6.3 /* 8dB */
#ifdef RADIO_RELAX
#define DTMF_REVERSE_TWIST ((digitmode & DSP_DIGITMODE_RELAXDTMF) ? 6.5 : 2.5) /* 4dB normal */
#else
#define DTMF_REVERSE_TWIST ((digitmode & DSP_DIGITMODE_RELAXDTMF) ? 4.0 : 2.5) /* 4dB normal */
#endif
#define DTMF_RELATIVE_PEAK_ROW 6.3 /* 8dB */
#define DTMF_RELATIVE_PEAK_COL 6.3 /* 8dB */
#define DTMF_2ND_HARMONIC_ROW ((digitmode & DSP_DIGITMODE_RELAXDTMF) ? 1.7 : 2.5) /* 4dB normal */
#define DTMF_2ND_HARMONIC_COL 63.1 /* 18dB */
#ifndef OLD_DSP_ROUTINES
#define DTMF_TO_TOTAL_ENERGY 42.0
#endif
#ifdef OLD_DSP_ROUTINES
#define MF_THRESHOLD 8.0e7
#define MF_NORMAL_TWIST 5.3 /* 8dB */
#define MF_REVERSE_TWIST 4.0 /* was 2.5 */
#define MF_RELATIVE_PEAK 5.3 /* 8dB */
#define MF_2ND_HARMONIC 1.7 /* was 2.5 */
#else
#define BELL_MF_THRESHOLD 1.6e9
#define BELL_MF_TWIST 4.0 /* 6dB */
#define BELL_MF_RELATIVE_PEAK 12.6 /* 11dB */
#endif
typedef struct {
float v2;
float v3;
float fac;
#ifndef OLD_DSP_ROUTINES
int samples;
#endif
} goertzel_state_t;
typedef struct
{
goertzel_state_t row_out[4];
goertzel_state_t col_out[4];
#ifdef FAX_DETECT
goertzel_state_t fax_tone;
#ifdef OLD_DSP_ROUTINES
goertzel_state_t row_out2nd[4];
goertzel_state_t col_out2nd[4];
#ifdef FAX_DETECT
goertzel_state_t fax_tone2nd;
int hit1;
int hit2;
int hit3;
int hit4;
#else
int hits[3];
#endif
int mhit;
char digits[MAX_DTMF_DIGITS + 1];
int current_digits;
int detected_digits;
int lost_digits;
int digit_hits[16];
#ifdef FAX_DETECT
} dtmf_detect_state_t;
typedef struct
{
goertzel_state_t tone_out[6];
int mhit;
#ifdef OLD_DSP_ROUTINES
int hit1;
int hit2;
int hit3;
int hit4;
goertzel_state_t tone_out2nd[6];
float energy;
#else
int hits[5];
#endif
int current_sample;
char digits[MAX_DTMF_DIGITS + 1];
int current_digits;
int detected_digits;
int lost_digits;
#ifdef FAX_DETECT
} mf_detect_state_t;
static float dtmf_row[] =
{
697.0, 770.0, 852.0, 941.0
};
static float dtmf_col[] =
{
1209.0, 1336.0, 1477.0, 1633.0
};
static float mf_tones[] =
{
700.0, 900.0, 1100.0, 1300.0, 1500.0, 1700.0
};
#ifdef FAX_DETECT
static char dtmf_positions[] = "123A" "456B" "789C" "*0#D";
#ifdef OLD_DSP_ROUTINES
static char mf_hit[6][6] = {
/* 700 + */ { 0, '1', '2', '4', '7', 'C' },
/* 900 + */ { '1', 0, '3', '5', '8', 'A' },
/* 1100 + */ { '2', '3', 0, '6', '9', '*' },
/* 1300 + */ { '4', '5', '6', 0, '0', 'B' },
/* 1500 + */ { '7', '8', '9', '0', 0, '#' },
/* 1700 + */ { 'C', 'A', '*', 'B', '#', 0 },
};
#else
static char bell_mf_positions[] = "1247C-358A--69*---0B----#";
#endif
static inline void goertzel_sample(goertzel_state_t *s, short sample)
{
float v1;
float fsamp = sample;
v1 = s->v2;
s->v2 = s->v3;
s->v3 = s->fac * s->v2 - v1 + fsamp;
}
static inline void goertzel_update(goertzel_state_t *s, short *samps, int count)
{
int i;
for (i=0;i<count;i++)
goertzel_sample(s, samps[i]);
}
static inline float goertzel_result(goertzel_state_t *s)
{
return s->v3 * s->v3 + s->v2 * s->v2 - s->v2 * s->v3 * s->fac;
}
static inline void goertzel_init(goertzel_state_t *s, float freq, int samples)
{
s->v2 = s->v3 = 0.0;
s->fac = 2.0 * cos(2.0 * M_PI * (freq / 8000.0));
#ifndef OLD_DSP_ROUTINES
s->samples = samples;
#endif
}
static inline void goertzel_reset(goertzel_state_t *s)
{
s->v2 = s->v3 = 0.0;
}
struct ast_dsp {
struct ast_frame f;
int threshold;
int totalsilence;
int totalnoise;
int features;
int busymaybe;
int busycount;
int historicnoise[DSP_HISTORY];
int historicsilence[DSP_HISTORY];
goertzel_state_t freqs[7];
int tstate;
int tcount;
int digitmode;
int thinkdigit;
float genergy;
union {
dtmf_detect_state_t dtmf;
mf_detect_state_t mf;
} td;
};
static void ast_dtmf_detect_init (dtmf_detect_state_t *s)
{
int i;
#ifdef OLD_DSP_ROUTINES
s->mhit =
s->hit3 =
s->hit4 =
#else
s->hits[0] = s->hits[1] = s->hits[2] = 0;
#endif
goertzel_init (&s->row_out[i], dtmf_row[i], 102);
goertzel_init (&s->col_out[i], dtmf_col[i], 102);
#ifdef OLD_DSP_ROUTINES
goertzel_init (&s->row_out2nd[i], dtmf_row[i] * 2.0, 102);
goertzel_init (&s->col_out2nd[i], dtmf_col[i] * 2.0, 102);
#endif
#ifdef FAX_DETECT
goertzel_init (&s->fax_tone, fax_freq, 102);
#ifdef OLD_DSP_ROUTINES
goertzel_init (&s->fax_tone2nd, fax_freq * 2.0, 102);
#endif
#endif /* FAX_DETECT */
s->current_sample = 0;
s->detected_digits = 0;
s->current_digits = 0;
memset(&s->digits, 0, sizeof(s->digits));
s->lost_digits = 0;
s->digits[0] = '\0';
}
static void ast_mf_detect_init (mf_detect_state_t *s)
{
int i;
#ifdef OLD_DSP_ROUTINES
#else
s->hits[0] = s->hits[1] = s->hits[2] = s->hits[3] = s->hits[4] = 0;
#endif
goertzel_init (&s->tone_out[i], mf_tones[i], 160);
#ifdef OLD_DSP_ROUTINES
goertzel_init (&s->tone_out2nd[i], mf_tones[i] * 2.0, 160);
#endif
}
s->current_digits = 0;
memset(&s->digits, 0, sizeof(s->digits));
s->current_sample = 0;
s->detected_digits = 0;
s->lost_digits = 0;
s->digits[0] = '\0';
s->mhit = 0;
}
static int dtmf_detect (dtmf_detect_state_t *s,
int16_t amp[],
int samples,
int digitmode, int *writeback, int faxdetect)
{
float row_energy[4];
float col_energy[4];
#ifdef FAX_DETECT
#ifdef OLD_DSP_ROUTINES
#endif
#endif /* FAX_DETECT */
float famp;
float v1;
int i;
int j;
int sample;
int best_row;
int best_col;
int hit;
int limit;
hit = 0;
for (sample = 0; sample < samples; sample = limit)
{
/* 102 is optimised to meet the DTMF specs. */
if ((samples - sample) >= (102 - s->current_sample))
limit = sample + (102 - s->current_sample);
else
limit = samples;
#if defined(USE_3DNOW)
_dtmf_goertzel_update (s->row_out, amp + sample, limit - sample);
_dtmf_goertzel_update (s->col_out, amp + sample, limit - sample);
#ifdef OLD_DSP_ROUTINES
_dtmf_goertzel_update (s->row_out2nd, amp + sample, limit2 - sample);
_dtmf_goertzel_update (s->col_out2nd, amp + sample, limit2 - sample);
#endif
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
/* XXX Need to fax detect for 3dnow too XXX */
#warning "Fax Support Broken"
#else
/* The following unrolled loop takes only 35% (rough estimate) of the
time of a rolled loop on the machine on which it was developed */
for (j = sample; j < limit; j++)
{
famp = amp[j];
s->energy += famp*famp;
/* With GCC 2.95, the following unrolled code seems to take about 35%
(rough estimate) as long as a neat little 0-3 loop */
v1 = s->row_out[0].v2;
s->row_out[0].v2 = s->row_out[0].v3;
s->row_out[0].v3 = s->row_out[0].fac*s->row_out[0].v2 - v1 + famp;
v1 = s->col_out[0].v2;
s->col_out[0].v2 = s->col_out[0].v3;
s->col_out[0].v3 = s->col_out[0].fac*s->col_out[0].v2 - v1 + famp;
v1 = s->row_out[1].v2;
s->row_out[1].v2 = s->row_out[1].v3;
s->row_out[1].v3 = s->row_out[1].fac*s->row_out[1].v2 - v1 + famp;
v1 = s->col_out[1].v2;
s->col_out[1].v2 = s->col_out[1].v3;
s->col_out[1].v3 = s->col_out[1].fac*s->col_out[1].v2 - v1 + famp;
v1 = s->row_out[2].v2;
s->row_out[2].v2 = s->row_out[2].v3;
s->row_out[2].v3 = s->row_out[2].fac*s->row_out[2].v2 - v1 + famp;
v1 = s->col_out[2].v2;
s->col_out[2].v2 = s->col_out[2].v3;
s->col_out[2].v3 = s->col_out[2].fac*s->col_out[2].v2 - v1 + famp;
v1 = s->row_out[3].v2;
s->row_out[3].v2 = s->row_out[3].v3;
s->row_out[3].v3 = s->row_out[3].fac*s->row_out[3].v2 - v1 + famp;
v1 = s->col_out[3].v2;
s->col_out[3].v2 = s->col_out[3].v3;
s->col_out[3].v3 = s->col_out[3].fac*s->col_out[3].v2 - v1 + famp;
#ifdef FAX_DETECT
/* Update fax tone */
v1 = s->fax_tone.v2;
s->fax_tone.v2 = s->fax_tone.v3;
s->fax_tone.v3 = s->fax_tone.fac*s->fax_tone.v2 - v1 + famp;
#endif /* FAX_DETECT */
#ifdef OLD_DSP_ROUTINES
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
v1 = s->col_out2nd[0].v2;
s->col_out2nd[0].v2 = s->col_out2nd[0].v3;
s->col_out2nd[0].v3 = s->col_out2nd[0].fac*s->col_out2nd[0].v2 - v1 + famp;
v1 = s->row_out2nd[0].v2;
s->row_out2nd[0].v2 = s->row_out2nd[0].v3;
s->row_out2nd[0].v3 = s->row_out2nd[0].fac*s->row_out2nd[0].v2 - v1 + famp;
v1 = s->col_out2nd[1].v2;
s->col_out2nd[1].v2 = s->col_out2nd[1].v3;
s->col_out2nd[1].v3 = s->col_out2nd[1].fac*s->col_out2nd[1].v2 - v1 + famp;
v1 = s->row_out2nd[1].v2;
s->row_out2nd[1].v2 = s->row_out2nd[1].v3;
s->row_out2nd[1].v3 = s->row_out2nd[1].fac*s->row_out2nd[1].v2 - v1 + famp;
v1 = s->col_out2nd[2].v2;
s->col_out2nd[2].v2 = s->col_out2nd[2].v3;
s->col_out2nd[2].v3 = s->col_out2nd[2].fac*s->col_out2nd[2].v2 - v1 + famp;
v1 = s->row_out2nd[2].v2;
s->row_out2nd[2].v2 = s->row_out2nd[2].v3;
s->row_out2nd[2].v3 = s->row_out2nd[2].fac*s->row_out2nd[2].v2 - v1 + famp;
v1 = s->col_out2nd[3].v2;
s->col_out2nd[3].v2 = s->col_out2nd[3].v3;
s->col_out2nd[3].v3 = s->col_out2nd[3].fac*s->col_out2nd[3].v2 - v1 + famp;
v1 = s->row_out2nd[3].v2;
s->row_out2nd[3].v2 = s->row_out2nd[3].v3;
s->row_out2nd[3].v3 = s->row_out2nd[3].fac*s->row_out2nd[3].v2 - v1 + famp;
#ifdef FAX_DETECT
/* Update fax tone */
v1 = s->fax_tone.v2;
s->fax_tone2nd.v2 = s->fax_tone2nd.v3;
s->fax_tone2nd.v3 = s->fax_tone2nd.fac*s->fax_tone2nd.v2 - v1 + famp;
#endif /* FAX_DETECT */
#endif
}
#endif
s->current_sample += (limit - sample);
if (s->current_sample < 102) {
if (hit && !((digitmode & DSP_DIGITMODE_NOQUELCH))) {
/* If we had a hit last time, go ahead and clear this out since likely it
will be another hit */
for (i=sample;i<limit;i++)
amp[i] = 0;
*writeback = 1;
}
continue;
}
#ifdef FAX_DETECT
/* Detect the fax energy, too */
fax_energy = goertzel_result(&s->fax_tone);
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
/* We are at the end of a DTMF detection block */
/* Find the peak row and the peak column */
row_energy[0] = goertzel_result (&s->row_out[0]);
col_energy[0] = goertzel_result (&s->col_out[0]);
for (best_row = best_col = 0, i = 1; i < 4; i++)
{
row_energy[i] = goertzel_result (&s->row_out[i]);
if (row_energy[i] > row_energy[best_row])
best_row = i;
col_energy[i] = goertzel_result (&s->col_out[i]);
if (col_energy[i] > col_energy[best_col])
best_col = i;
}
hit = 0;
/* Basic signal level test and the twist test */
if (row_energy[best_row] >= DTMF_THRESHOLD
&&
col_energy[best_col] >= DTMF_THRESHOLD
&&
col_energy[best_col] < row_energy[best_row]*DTMF_REVERSE_TWIST
&&
col_energy[best_col]*DTMF_NORMAL_TWIST > row_energy[best_row])
{
/* Relative peak test */
for (i = 0; i < 4; i++)
{
if ((i != best_col && col_energy[i]*DTMF_RELATIVE_PEAK_COL > col_energy[best_col])
||
(i != best_row && row_energy[i]*DTMF_RELATIVE_PEAK_ROW > row_energy[best_row]))
{
break;
}
}
#ifdef OLD_DSP_ROUTINES
/* ... and second harmonic test */
if (i >= 4
&&
(row_energy[best_row] + col_energy[best_col]) > 42.0*s->energy
&&
goertzel_result (&s->col_out2nd[best_col])*DTMF_2ND_HARMONIC_COL < col_energy[best_col]
&&
goertzel_result (&s->row_out2nd[best_row])*DTMF_2ND_HARMONIC_ROW < row_energy[best_row])
#else
/* ... and fraction of total energy test */
if (i >= 4
&&
(row_energy[best_row] + col_energy[best_col]) > DTMF_TO_TOTAL_ENERGY*s->energy)
#endif
{
/* Got a hit */
hit = dtmf_positions[(best_row << 2) + best_col];
if (!(digitmode & DSP_DIGITMODE_NOQUELCH)) {
/* Zero out frame data if this is part DTMF */
for (i=sample;i<limit;i++)
amp[i] = 0;
*writeback = 1;
}
/* Look for two successive similar results */
/* The logic in the next test is:
We need two successive identical clean detects, with
something different preceeding it. This can work with
back to back differing digits. More importantly, it
can work with nasty phones that give a very wobbly start
to a digit. */
#ifdef OLD_DSP_ROUTINES
s->mhit = hit;
s->digit_hits[(best_row << 2) + best_col]++;
s->detected_digits++;
if (s->current_digits < MAX_DTMF_DIGITS)
{
s->digits[s->current_digits++] = hit;
s->digits[s->current_digits] = '\0';
}
else
{
s->lost_digits++;
}
}
#else
if (hit == s->hits[2] && hit != s->hits[1] && hit != s->hits[0])
{
s->mhit = hit;
s->digit_hits[(best_row << 2) + best_col]++;
s->detected_digits++;
if (s->current_digits < MAX_DTMF_DIGITS)
{
s->digits[s->current_digits++] = hit;
s->digits[s->current_digits] = '\0';
}
else
{
s->lost_digits++;
}
}
#endif
#ifdef FAX_DETECT
if (!hit && (fax_energy >= FAX_THRESHOLD) && (fax_energy >= DTMF_TO_TOTAL_ENERGY*s->energy) && (faxdetect)) {
#if 0
printf("Fax energy/Second Harmonic: %f\n", fax_energy);
#endif
/* XXX Probably need better checking than just this the energy XXX */
hit = 'f';
s->fax_hits++;
}
else {
s->mhit = 'f';
s->detected_digits++;
if (s->current_digits < MAX_DTMF_DIGITS)
{
s->digits[s->current_digits++] = hit;
s->digits[s->current_digits] = '\0';
}
else
{
s->lost_digits++;
}
}
s->fax_hits = 0;
}
#endif /* FAX_DETECT */
#ifdef OLD_DSP_ROUTINES
s->hit1 = s->hit2;
s->hit2 = s->hit3;
s->hit3 = hit;
#else
s->hits[0] = s->hits[1];
s->hits[1] = s->hits[2];
s->hits[2] = hit;
#endif
/* Reinitialise the detector for the next block */
for (i = 0; i < 4; i++)
{
goertzel_reset(&s->row_out[i]);
goertzel_reset(&s->col_out[i]);
#ifdef OLD_DSP_ROUTINES
goertzel_reset(&s->row_out2nd[i]);
goertzel_reset(&s->col_out2nd[i]);
#endif
#ifdef FAX_DETECT
#ifdef OLD_DSP_ROUTINES
#endif
s->energy = 0.0;
s->current_sample = 0;
}
if ((!s->mhit) || (s->mhit != hit))
{
s->mhit = 0;
return(0);
}
return (hit);
}
/* MF goertzel size */
#ifdef OLD_DSP_ROUTINES
#else
#define MF_GSIZE 120
#endif
static int mf_detect (mf_detect_state_t *s,
int16_t amp[],
int samples,
int digitmode, int *writeback)
{
#ifdef OLD_DSP_ROUTINES
int best1;
int best2;
float max;
int sofarsogood;
#else
float energy[6];
int best;
int second_best;
#endif
float famp;
float v1;
int i;
int j;
int sample;
int hit;
int limit;
hit = 0;
for (sample = 0; sample < samples; sample = limit)
{
/* 80 is optimised to meet the MF specs. */
if ((samples - sample) >= (MF_GSIZE - s->current_sample))
limit = sample + (MF_GSIZE - s->current_sample);
else
limit = samples;
#if defined(USE_3DNOW)
_dtmf_goertzel_update (s->row_out, amp + sample, limit - sample);
_dtmf_goertzel_update (s->col_out, amp + sample, limit - sample);
#ifdef OLD_DSP_ROUTINES
_dtmf_goertzel_update (s->row_out2nd, amp + sample, limit2 - sample);
_dtmf_goertzel_update (s->col_out2nd, amp + sample, limit2 - sample);
#endif
/* XXX Need to fax detect for 3dnow too XXX */
#warning "Fax Support Broken"
#else
/* The following unrolled loop takes only 35% (rough estimate) of the
time of a rolled loop on the machine on which it was developed */
for (j = sample; j < limit; j++)
{
famp = amp[j];
#ifdef OLD_DSP_ROUTINES
#endif
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
/* With GCC 2.95, the following unrolled code seems to take about 35%
(rough estimate) as long as a neat little 0-3 loop */
v1 = s->tone_out[0].v2;
s->tone_out[0].v2 = s->tone_out[0].v3;
s->tone_out[0].v3 = s->tone_out[0].fac*s->tone_out[0].v2 - v1 + famp;
v1 = s->tone_out[1].v2;
s->tone_out[1].v2 = s->tone_out[1].v3;
s->tone_out[1].v3 = s->tone_out[1].fac*s->tone_out[1].v2 - v1 + famp;
v1 = s->tone_out[2].v2;
s->tone_out[2].v2 = s->tone_out[2].v3;
s->tone_out[2].v3 = s->tone_out[2].fac*s->tone_out[2].v2 - v1 + famp;
v1 = s->tone_out[3].v2;
s->tone_out[3].v2 = s->tone_out[3].v3;
s->tone_out[3].v3 = s->tone_out[3].fac*s->tone_out[3].v2 - v1 + famp;
v1 = s->tone_out[4].v2;
s->tone_out[4].v2 = s->tone_out[4].v3;
s->tone_out[4].v3 = s->tone_out[4].fac*s->tone_out[4].v2 - v1 + famp;
v1 = s->tone_out[5].v2;
s->tone_out[5].v2 = s->tone_out[5].v3;
s->tone_out[5].v3 = s->tone_out[5].fac*s->tone_out[5].v2 - v1 + famp;
#ifdef OLD_DSP_ROUTINES
v1 = s->tone_out2nd[0].v2;
s->tone_out2nd[0].v2 = s->tone_out2nd[0].v3;
s->tone_out2nd[0].v3 = s->tone_out2nd[0].fac*s->tone_out2nd[0].v2 - v1 + famp;
v1 = s->tone_out2nd[1].v2;
s->tone_out2nd[1].v2 = s->tone_out2nd[1].v3;
s->tone_out2nd[1].v3 = s->tone_out2nd[1].fac*s->tone_out2nd[1].v2 - v1 + famp;
v1 = s->tone_out2nd[2].v2;
s->tone_out2nd[2].v2 = s->tone_out2nd[2].v3;
s->tone_out2nd[2].v3 = s->tone_out2nd[2].fac*s->tone_out2nd[2].v2 - v1 + famp;
v1 = s->tone_out2nd[3].v2;
s->tone_out2nd[3].v2 = s->tone_out2nd[3].v3;
s->tone_out2nd[3].v3 = s->tone_out2nd[3].fac*s->tone_out2nd[3].v2 - v1 + famp;
v1 = s->tone_out2nd[4].v2;
s->tone_out2nd[4].v2 = s->tone_out2nd[4].v3;
s->tone_out2nd[4].v3 = s->tone_out2nd[4].fac*s->tone_out2nd[2].v2 - v1 + famp;
v1 = s->tone_out2nd[3].v2;
s->tone_out2nd[5].v2 = s->tone_out2nd[6].v3;
s->tone_out2nd[5].v3 = s->tone_out2nd[6].fac*s->tone_out2nd[3].v2 - v1 + famp;
#endif
}
#endif
s->current_sample += (limit - sample);
if (s->current_sample < MF_GSIZE) {
if (hit && !((digitmode & DSP_DIGITMODE_NOQUELCH))) {
/* If we had a hit last time, go ahead and clear this out since likely it
will be another hit */
for (i=sample;i<limit;i++)
amp[i] = 0;
*writeback = 1;
}
continue;
}
#ifdef OLD_DSP_ROUTINES
/* We're at the end of an MF detection block. Go ahead and calculate
all the energies. */
for (i=0;i<6;i++) {
tone_energy[i] = goertzel_result(&s->tone_out[i]);
}
/* Find highest */
best1 = 0;
max = tone_energy[0];
for (i=1;i<6;i++) {
if (tone_energy[i] > max) {
max = tone_energy[i];
best1 = i;
}
}
/* Find 2nd highest */
if (best1) {
best2 = 0;
} else {
best2 = 1;
}
for (i=0;i<6;i++) {
if (i == best1) continue;
if (tone_energy[i] > max) {
max = tone_energy[i];
best2 = i;
}
}
if (best1 != best2) sofarsogood=1;
else sofarsogood=0;
/* Check for relative energies */
for (i=0;i<6;i++) {
if (i == best1) continue;
if (i == best2) continue;
if (tone_energy[best1] < tone_energy[i] * MF_RELATIVE_PEAK) {
sofarsogood = 0;
break;
}
if (tone_energy[best2] < tone_energy[i] * MF_RELATIVE_PEAK) {
sofarsogood = 0;
break;
}
}
if (sofarsogood) {
/* Check for 2nd harmonic */
if (goertzel_result(&s->tone_out2nd[best1]) * MF_2ND_HARMONIC > tone_energy[best1])
sofarsogood = 0;
else if (goertzel_result(&s->tone_out2nd[best2]) * MF_2ND_HARMONIC > tone_energy[best2])
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
sofarsogood = 0;
}
if (sofarsogood) {
hit = mf_hit[best1][best2];
if (!(digitmode & DSP_DIGITMODE_NOQUELCH)) {
/* Zero out frame data if this is part DTMF */
for (i=sample;i<limit;i++)
amp[i] = 0;
*writeback = 1;
}
/* Look for two consecutive clean hits */
if ((hit == s->hit3) && (s->hit3 != s->hit2)) {
s->mhit = hit;
s->detected_digits++;
if (s->current_digits < MAX_DTMF_DIGITS - 2) {
s->digits[s->current_digits++] = hit;
s->digits[s->current_digits] = '\0';
} else {
s->lost_digits++;
}
}
}
s->hit1 = s->hit2;
s->hit2 = s->hit3;
s->hit3 = hit;
/* Reinitialise the detector for the next block */
for (i = 0; i < 6; i++)
{
goertzel_reset(&s->tone_out[i]);
goertzel_reset(&s->tone_out2nd[i]);
}
s->energy = 0.0;
s->current_sample = 0;
}
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
#else
/* We're at the end of an MF detection block. */
/* Find the two highest energies. The spec says to look for
two tones and two tones only. Taking this literally -ie
only two tones pass the minimum threshold - doesn't work
well. The sinc function mess, due to rectangular windowing
ensure that! Find the two highest energies and ensure they
are considerably stronger than any of the others. */
energy[0] = goertzel_result(&s->tone_out[0]);
energy[1] = goertzel_result(&s->tone_out[1]);
if (energy[0] > energy[1])
{
best = 0;
second_best = 1;
}
else
{
best = 1;
second_best = 0;
}
/*endif*/
for (i = 2; i < 6; i++)
{
energy[i] = goertzel_result(&s->tone_out[i]);
if (energy[i] >= energy[best])
{
second_best = best;
best = i;
}
else if (energy[i] >= energy[second_best])
{
second_best = i;
}
}
/* Basic signal level and twist tests */
hit = 0;
if (energy[best] >= BELL_MF_THRESHOLD
&&
energy[second_best] >= BELL_MF_THRESHOLD
&&
energy[best] < energy[second_best]*BELL_MF_TWIST
&&
energy[best]*BELL_MF_TWIST > energy[second_best])
{
/* Relative peak test */
hit = -1;
for (i = 0; i < 6; i++)
{
if (i != best && i != second_best)
{
if (energy[i]*BELL_MF_RELATIVE_PEAK >= energy[second_best])
{
/* The best two are not clearly the best */
hit = 0;
break;
}
}
}
}
if (hit)
{
/* Get the values into ascending order */
if (second_best < best)
{
i = best;
best = second_best;
second_best = i;
}
best = best*5 + second_best - 1;
hit = bell_mf_positions[best];
/* Look for two successive similar results */
/* The logic in the next test is:
For KP we need 4 successive identical clean detects, with
two blocks of something different preceeding it. For anything
else we need two successive identical clean detects, with
two blocks of something different preceeding it. */
if (hit == s->hits[4]
&&
hit == s->hits[3]
&&
((hit != '*' && hit != s->hits[2] && hit != s->hits[1])
||
(hit == '*' && hit == s->hits[2] && hit != s->hits[1] && hit != s->hits[0])))
{
s->detected_digits++;
if (s->current_digits < MAX_DTMF_DIGITS)
{
s->digits[s->current_digits++] = hit;
s->digits[s->current_digits] = '\0';
}
else
{
s->lost_digits++;
}
}
}
else
{
hit = 0;
}
s->hits[0] = s->hits[1];
s->hits[1] = s->hits[2];
s->hits[2] = s->hits[3];
s->hits[3] = s->hits[4];
s->hits[4] = hit;
/* Reinitialise the detector for the next block */
for (i = 0; i < 6; i++)
goertzel_reset(&s->tone_out[i]);
s->current_sample = 0;
}
#endif
if ((!s->mhit) || (s->mhit != hit))
{
s->mhit = 0;
return(0);
}
return (hit);
}
static int __ast_dsp_digitdetect(struct ast_dsp *dsp, short *s, int len, int *writeback)
{
int res;
if (dsp->digitmode & DSP_DIGITMODE_MF)
res = mf_detect(&dsp->td.mf, s, len, dsp->digitmode & DSP_DIGITMODE_RELAXDTMF, writeback);
else
res = dtmf_detect(&dsp->td.dtmf, s, len, dsp->digitmode & DSP_DIGITMODE_RELAXDTMF, writeback, dsp->features & DSP_FEATURE_FAX_DETECT);
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
return res;
}
int ast_dsp_digitdetect(struct ast_dsp *dsp, struct ast_frame *inf)
{
short *s;
int len;
int ign=0;
if (inf->frametype != AST_FRAME_VOICE) {
ast_log(LOG_WARNING, "Can't check call progress of non-voice frames\n");
return 0;
}
if (inf->subclass != AST_FORMAT_SLINEAR) {
ast_log(LOG_WARNING, "Can only check call progress in signed-linear frames\n");
return 0;
}
s = inf->data;
len = inf->datalen / 2;
return __ast_dsp_digitdetect(dsp, s, len, &ign);
}
static inline int pair_there(float p1, float p2, float i1, float i2, float e)
{
/* See if p1 and p2 are there, relative to i1 and i2 and total energy */
/* Make sure absolute levels are high enough */
if ((p1 < TONE_MIN_THRESH) || (p2 < TONE_MIN_THRESH))
return 0;
/* Amplify ignored stuff */
i2 *= TONE_THRESH;
i1 *= TONE_THRESH;
e *= TONE_THRESH;
/* Check first tone */
if ((p1 < i1) || (p1 < i2) || (p1 < e))
return 0;
/* And second */
if ((p2 < i1) || (p2 < i2) || (p2 < e))
return 0;
/* Guess it's there... */
return 1;
}
int ast_dsp_getdigits (struct ast_dsp *dsp,
char *buf,
int max)
{
if (dsp->digitmode & DSP_DIGITMODE_MF) {
if (max > dsp->td.mf.current_digits)
max = dsp->td.mf.current_digits;
if (max > 0)
{
memcpy (buf, dsp->td.mf.digits, max);
memmove (dsp->td.mf.digits, dsp->td.mf.digits + max, dsp->td.mf.current_digits - max);
dsp->td.mf.current_digits -= max;
}
buf[max] = '\0';
return max;
} else {
if (max > dsp->td.dtmf.current_digits)
max = dsp->td.dtmf.current_digits;
if (max > 0)
{
memcpy (buf, dsp->td.dtmf.digits, max);
memmove (dsp->td.dtmf.digits, dsp->td.dtmf.digits + max, dsp->td.dtmf.current_digits - max);
dsp->td.dtmf.current_digits -= max;
}
buf[max] = '\0';
return max;
}
}
static int __ast_dsp_call_progress(struct ast_dsp *dsp, short *s, int len)
{
int x;
int newstate = TONE_STATE_SILENCE;
int res = 0;
while(len) {
/* Take the lesser of the number of samples we need and what we have */
pass = len;
if (pass > dsp->gsamp_size - dsp->gsamps)
pass = dsp->gsamp_size - dsp->gsamps;
for (y=0;y<dsp->freqcount;y++)
goertzel_sample(&dsp->freqs[y], s[x]);
dsp->genergy += s[x] * s[x];
}
s += pass;
dsp->gsamps += pass;
len -= pass;
if (dsp->gsamps == dsp->gsamp_size) {
float hz[7];
for (y=0;y<7;y++)
hz[y] = goertzel_result(&dsp->freqs[y]);
#if 0
printf("Got whole dsp state: 350: %e, 440: %e, 480: %e, 620: %e, 950: %e, 1400: %e, 1800: %e, Energy: %e\n",
hz_350, hz_440, hz_480, hz_620, hz_950, hz_1400, hz_1800, dsp->genergy);
#endif
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
switch(dsp->progmode) {
case PROG_MODE_NA:
if (pair_there(hz[HZ_480], hz[HZ_620], hz[HZ_350], hz[HZ_440], dsp->genergy)) {
newstate = TONE_STATE_BUSY;
} else if (pair_there(hz[HZ_440], hz[HZ_480], hz[HZ_350], hz[HZ_620], dsp->genergy)) {
newstate = TONE_STATE_RINGING;
} else if (pair_there(hz[HZ_350], hz[HZ_440], hz[HZ_480], hz[HZ_620], dsp->genergy)) {
newstate = TONE_STATE_DIALTONE;
} else if (hz[HZ_950] > TONE_MIN_THRESH * TONE_THRESH) {
newstate = TONE_STATE_SPECIAL1;
} else if (hz[HZ_1400] > TONE_MIN_THRESH * TONE_THRESH) {
if (dsp->tstate == TONE_STATE_SPECIAL1)
newstate = TONE_STATE_SPECIAL2;
} else if (hz[HZ_1800] > TONE_MIN_THRESH * TONE_THRESH) {
if (dsp->tstate == TONE_STATE_SPECIAL2)
newstate = TONE_STATE_SPECIAL3;
} else if (dsp->genergy > TONE_MIN_THRESH * TONE_THRESH) {
newstate = TONE_STATE_TALKING;
} else
newstate = TONE_STATE_SILENCE;
break;
case PROG_MODE_CR:
if (hz[HZ_425] > TONE_MIN_THRESH * TONE_THRESH) {
newstate = TONE_STATE_RINGING;
} else if (dsp->genergy > TONE_MIN_THRESH * TONE_THRESH) {
newstate = TONE_STATE_TALKING;
} else
newstate = TONE_STATE_SILENCE;
break;
default:
ast_log(LOG_WARNING, "Can't process in unknown prog mode '%d'\n", dsp->progmode);
}
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
if (newstate == dsp->tstate) {
dsp->tcount++;
if (dsp->tcount == COUNT_THRESH) {
if (dsp->tstate == TONE_STATE_BUSY) {
res = AST_CONTROL_BUSY;
dsp->features &= ~DSP_FEATURE_CALL_PROGRESS;
} else if (dsp->tstate == TONE_STATE_TALKING) {
res = AST_CONTROL_ANSWER;
dsp->features &= ~DSP_FEATURE_CALL_PROGRESS;
} else if (dsp->tstate == TONE_STATE_RINGING)
res = AST_CONTROL_RINGING;
else if (dsp->tstate == TONE_STATE_SPECIAL3) {
res = AST_CONTROL_CONGESTION;
dsp->features &= ~DSP_FEATURE_CALL_PROGRESS;
}
}
} else {
#if 0
printf("Newstate: %d\n", newstate);
#endif
dsp->tstate = newstate;
dsp->tcount = 1;
}
/* Reset goertzel */
for (x=0;x<7;x++)
dsp->freqs[x].v2 = dsp->freqs[x].v3 = 0.0;
dsp->gsamps = 0;
dsp->genergy = 0.0;
}
}
#if 0
if (res)
printf("Returning %d\n", res);
#endif
return res;
}
int ast_dsp_call_progress(struct ast_dsp *dsp, struct ast_frame *inf)
{
if (inf->frametype != AST_FRAME_VOICE) {
ast_log(LOG_WARNING, "Can't check call progress of non-voice frames\n");
return 0;
}
if (inf->subclass != AST_FORMAT_SLINEAR) {
ast_log(LOG_WARNING, "Can only check call progress in signed-linear frames\n");
return 0;
}
return __ast_dsp_call_progress(dsp, inf->data, inf->datalen / 2);
}
static int __ast_dsp_silence(struct ast_dsp *dsp, short *s, int len, int *totalsilence)
{
int accum;
int x;
int res = 0;
accum = 0;
for (x=0;x<len; x++)
accum += abs(s[x]);
Martin Pycko
committed
accum /= len;
if (accum < dsp->threshold) {
dsp->totalsilence += len/8;
if (dsp->totalnoise) {
/* Move and save history */
Martin Pycko
committed
memmove(dsp->historicnoise + DSP_HISTORY - dsp->busycount, dsp->historicnoise + DSP_HISTORY - dsp->busycount +1, dsp->busycount*sizeof(dsp->historicnoise[0]));
dsp->historicnoise[DSP_HISTORY - 1] = dsp->totalnoise;
Martin Pycko
committed
/* we don't want to check for busydetect that frequently */
#if 0
Martin Pycko
committed
#endif
}
dsp->totalnoise = 0;
res = 1;
} else {
dsp->totalnoise += len/8;
if (dsp->totalsilence) {
Martin Pycko
committed
int silence1 = dsp->historicsilence[DSP_HISTORY - 1];
int silence2 = dsp->historicsilence[DSP_HISTORY - 2];
Martin Pycko
committed
memmove(dsp->historicsilence + DSP_HISTORY - dsp->busycount, dsp->historicsilence + DSP_HISTORY - dsp->busycount + 1, dsp->busycount*sizeof(dsp->historicsilence[0]));
dsp->historicsilence[DSP_HISTORY - 1] = dsp->totalsilence;
Martin Pycko
committed
/* check if the previous sample differs only by BUSY_PERCENT from the one before it */
if (silence1 < silence2) {
if (silence1 + silence1/BUSY_PERCENT >= silence2)
dsp->busymaybe = 1;
else
dsp->busymaybe = 0;
} else {
if (silence1 - silence1/BUSY_PERCENT <= silence2)
dsp->busymaybe = 1;
else
dsp->busymaybe = 0;
}
}
dsp->totalsilence = 0;
}
if (totalsilence)
*totalsilence = dsp->totalsilence;
return res;
}
Martin Pycko
committed
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
#ifdef BUSYDETECT_MARTIN
int ast_dsp_busydetect(struct ast_dsp *dsp)
{
int res = 0, x;
#ifndef BUSYDETECT_TONEONLY
int avgsilence = 0, hitsilence = 0;
#endif
int avgtone = 0, hittone = 0;
if (!dsp->busymaybe)
return res;
for (x=DSP_HISTORY - dsp->busycount;x<DSP_HISTORY;x++) {
#ifndef BUSYDETECT_TONEONLY
avgsilence += dsp->historicsilence[x];
#endif
avgtone += dsp->historicnoise[x];
}
#ifndef BUSYDETECT_TONEONLY
avgsilence /= dsp->busycount;
#endif
avgtone /= dsp->busycount;
for (x=DSP_HISTORY - dsp->busycount;x<DSP_HISTORY;x++) {
#ifndef BUSYDETECT_TONEONLY
if (avgsilence > dsp->historicsilence[x]) {
if (avgsilence - (avgsilence / BUSY_PERCENT) <= dsp->historicsilence[x])
hitsilence++;
} else {
if (avgsilence + (avgsilence / BUSY_PERCENT) >= dsp->historicsilence[x])
hitsilence++;
}
#endif
if (avgtone > dsp->historicnoise[x]) {
if (avgtone - (avgtone / BUSY_PERCENT) <= dsp->historicsilence[x])
hittone++;
} else {
if (avgtone + (avgtone / BUSY_PERCENT) >= dsp->historicsilence[x])
hittone++;
}
}
#ifndef BUSYDETECT_TONEONLY
if ((hittone >= dsp->busycount - 1) && (hitsilence >= dsp->busycount - 1) && (avgtone >= BUSY_MIN && avgtone <= BUSY_MAX) && (avgsilence >= BUSY_MIN && avgsilence <= BUSY_MAX)) {
#else
if ((hittone >= dsp->busycount - 1) && (avgtone >= BUSY_MIN && avgtone <= BUSY_MAX)) {
#endif
#ifdef BUSYDETECT_COMPARE_TONE_AND_SILENCE
#ifdef BUSYDETECT_TONEONLY
#error You cant use BUSYDETECT_TONEONLY together with BUSYDETECT_COMPARE_TONE_AND_SILENCE
Martin Pycko
committed
#endif
if (avgtone > avgsilence) {
if (avgtone - avgtone/(BUSY_PERCENT*2) <= avgsilence)
res = 1;
} else {
if (avgtone + avgtone/(BUSY_PERCENT*2) >= avgsilence)
res = 1;
}
#else
res = 1;
#endif
}
#if 0
if (res)
ast_log(LOG_NOTICE, "detected busy, avgtone: %d, avgsilence %d\n", avgtone, avgsilence);
#endif
return res;
}
#endif
Martin Pycko
committed
#ifdef BUSYDETECT
int ast_dsp_busydetect(struct ast_dsp *dsp)
{
int x;
int res = 0;
int max, min;
Martin Pycko
committed
#if 0
if (dsp->busy_hits > 5);
return 0;
#endif
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
if (dsp->busymaybe) {
#if 0
printf("Maybe busy!\n");
#endif
dsp->busymaybe = 0;
min = 9999;
max = 0;
for (x=DSP_HISTORY - dsp->busycount;x<DSP_HISTORY;x++) {
#if 0
printf("Silence: %d, Noise: %d\n", dsp->historicsilence[x], dsp->historicnoise[x]);
#endif
if (dsp->historicsilence[x] < min)
min = dsp->historicsilence[x];
if (dsp->historicnoise[x] < min)
min = dsp->historicnoise[x];
if (dsp->historicsilence[x] > max)
max = dsp->historicsilence[x];
if (dsp->historicnoise[x] > max)
max = dsp->historicnoise[x];
}
if ((max - min < BUSY_THRESHOLD) && (max < BUSY_MAX) && (min > BUSY_MIN)) {
#if 0
printf("Busy!\n");
#endif
res = 1;
}
#if 0
printf("Min: %d, max: %d\n", min, max);
#endif
}
return res;
}
Martin Pycko
committed
#endif
int ast_dsp_silence(struct ast_dsp *dsp, struct ast_frame *f, int *totalsilence)
{
short *s;
int len;
if (f->frametype != AST_FRAME_VOICE) {
ast_log(LOG_WARNING, "Can't calculate silence on a non-voice frame\n");
return 0;
}
if (f->subclass != AST_FORMAT_SLINEAR) {
ast_log(LOG_WARNING, "Can only calculate silence on signed-linear frames :(\n");
return 0;
}
s = f->data;
len = f->datalen/2;
return __ast_dsp_silence(dsp, s, len, totalsilence);
}
Mark Spencer
committed
struct ast_frame *ast_dsp_process(struct ast_channel *chan, struct ast_dsp *dsp, struct ast_frame *af)
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
{
int silence;
int res;
int digit;
int x;
unsigned short *shortdata;
unsigned char *odata;
int len;
int writeback = 0;
#define FIX_INF(inf) do { \
if (writeback) { \
switch(inf->subclass) { \
case AST_FORMAT_SLINEAR: \
break; \
case AST_FORMAT_ULAW: \
for (x=0;x<len;x++) \
odata[x] = AST_LIN2MU(shortdata[x]); \
break; \
case AST_FORMAT_ALAW: \
for (x=0;x<len;x++) \
odata[x] = AST_LIN2A(shortdata[x]); \
break; \
} \
} \
} while(0)
if (!af)
return NULL;
if (af->frametype != AST_FRAME_VOICE)
return af;
odata = af->data;
len = af->datalen;
/* Make sure we have short data */
switch(af->subclass) {
case AST_FORMAT_SLINEAR:
shortdata = af->data;
len = af->datalen / 2;
break;
case AST_FORMAT_ULAW:
shortdata = alloca(af->datalen * 2);
if (!shortdata) {
ast_log(LOG_WARNING, "Unable to allocate stack space for data: %s\n", strerror(errno));
return af;
}
for (x=0;x<len;x++)
shortdata[x] = AST_MULAW(odata[x]);
break;
case AST_FORMAT_ALAW:
shortdata = alloca(af->datalen * 2);
if (!shortdata) {
ast_log(LOG_WARNING, "Unable to allocate stack space for data: %s\n", strerror(errno));
return af;
}
for (x=0;x<len;x++)
shortdata[x] = AST_ALAW(odata[x]);
break;
default:
ast_log(LOG_WARNING, "Unable to process inband DTMF on %d frames\n", af->subclass);
return af;
}
silence = __ast_dsp_silence(dsp, shortdata, len, NULL);
if ((dsp->features & DSP_FEATURE_SILENCE_SUPPRESS) && silence) {
memset(&dsp->f, 0, sizeof(dsp->f));
dsp->f.frametype = AST_FRAME_NULL;
return &dsp->f;
}
if ((dsp->features & DSP_FEATURE_BUSY_DETECT) && ast_dsp_busydetect(dsp)) {
Martin Pycko
committed
chan->_softhangup |= AST_SOFTHANGUP_DEV;
memset(&dsp->f, 0, sizeof(dsp->f));
dsp->f.frametype = AST_FRAME_CONTROL;
dsp->f.subclass = AST_CONTROL_BUSY;
Martin Pycko
committed
ast_log(LOG_DEBUG, "Requesting Hangup because the busy tone was detected on channel %s\n", chan->name);
return &dsp->f;
}
if ((dsp->features & DSP_FEATURE_DTMF_DETECT)) {
digit = __ast_dsp_digitdetect(dsp, shortdata, len, &writeback);
#if 0
if (digit)
printf("Performing digit detection returned %d, digitmode is %d\n", digit, dsp->digitmode);
#endif
if (dsp->digitmode & (DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX)) {
if (!dsp->thinkdigit) {
if (digit) {
/* Looks like we might have something. Request a conference mute for the moment */
memset(&dsp->f, 0, sizeof(dsp->f));
dsp->f.frametype = AST_FRAME_DTMF;
dsp->f.subclass = 'm';
dsp->thinkdigit = 'x';
FIX_INF(af);
if (chan)
Mark Spencer
committed
ast_queue_frame(chan, af);
ast_frfree(af);
return &dsp->f;
}
} else {
if (digit) {
/* Thought we saw one last time. Pretty sure we really have now */
if (dsp->thinkdigit) {
if ((dsp->thinkdigit != 'x') && (dsp->thinkdigit != digit)) {
/* If we found a digit, and we're changing digits, go
ahead and send this one, but DON'T stop confmute because
we're detecting something else, too... */
memset(&dsp->f, 0, sizeof(dsp->f));
dsp->f.frametype = AST_FRAME_DTMF;
dsp->f.subclass = dsp->thinkdigit;
FIX_INF(af);
if (chan)
Mark Spencer
committed
ast_queue_frame(chan, af);
ast_frfree(af);
}
return &dsp->f;
}
} else {
if (dsp->thinkdigit) {
memset(&dsp->f, 0, sizeof(dsp->f));
if (dsp->thinkdigit != 'x') {
/* If we found a digit, send it now */
dsp->f.frametype = AST_FRAME_DTMF;
dsp->f.subclass = dsp->thinkdigit;
dsp->thinkdigit = 0;
} else {
dsp->f.frametype = AST_FRAME_DTMF;
dsp->f.subclass = 'u';
dsp->thinkdigit = 0;
Mark Spencer
committed
ast_queue_frame(chan, af);
ast_frfree(af);
return &dsp->f;
}
}
}
} else if (!digit) {
/* Only check when there is *not* a hit... */
if (dsp->digitmode & DSP_DIGITMODE_MF) {
if (dsp->td.mf.current_digits) {
memset(&dsp->f, 0, sizeof(dsp->f));
dsp->f.frametype = AST_FRAME_DTMF;
dsp->f.subclass = dsp->td.mf.digits[0];
memmove(dsp->td.mf.digits, dsp->td.mf.digits + 1, dsp->td.mf.current_digits);
dsp->td.mf.current_digits--;
FIX_INF(af);
if (chan)
Mark Spencer
committed
ast_queue_frame(chan, af);
ast_frfree(af);
return &dsp->f;
}
} else {
if (dsp->td.dtmf.current_digits) {
memset(&dsp->f, 0, sizeof(dsp->f));
dsp->f.frametype = AST_FRAME_DTMF;
dsp->f.subclass = dsp->td.dtmf.digits[0];
memmove(dsp->td.dtmf.digits, dsp->td.dtmf.digits + 1, dsp->td.dtmf.current_digits);
dsp->td.dtmf.current_digits--;
FIX_INF(af);
if (chan)
Mark Spencer
committed
ast_queue_frame(chan, af);
ast_frfree(af);
return &dsp->f;
}
}
}
}
if ((dsp->features & DSP_FEATURE_CALL_PROGRESS)) {
res = __ast_dsp_call_progress(dsp, shortdata, len);
memset(&dsp->f, 0, sizeof(dsp->f));
dsp->f.frametype = AST_FRAME_CONTROL;
if (res) {
switch(res) {
case AST_CONTROL_ANSWER:
case AST_CONTROL_BUSY:
case AST_CONTROL_RINGING:
case AST_CONTROL_CONGESTION:
dsp->f.subclass = res;
if (chan)
Mark Spencer
committed
ast_queue_frame(chan, &dsp->f);
break;
default:
ast_log(LOG_WARNING, "Don't know how to represent call progress message %d\n", res);
}
}
}
FIX_INF(af);
return af;
}
static void ast_dsp_prog_reset(struct ast_dsp *dsp)
{
int max = 0;
int x;
dsp->gsamp_size = modes[dsp->progmode].size;
dsp->gsamps = 0;
for (x=0;x<sizeof(modes[dsp->progmode].freqs) / sizeof(modes[dsp->progmode].freqs[0]);x++) {
if (modes[dsp->progmode].freqs[x]) {
goertzel_init(&dsp->freqs[x], (float)modes[dsp->progmode].freqs[x], dsp->gsamp_size);
max = x;
}
}
dsp->freqcount = max;
}
struct ast_dsp *ast_dsp_new(void)
{
struct ast_dsp *dsp;
dsp = malloc(sizeof(struct ast_dsp));
if (dsp) {
memset(dsp, 0, sizeof(struct ast_dsp));
dsp->threshold = DEFAULT_THRESHOLD;
dsp->features = DSP_FEATURE_SILENCE_SUPPRESS;
Martin Pycko
committed
dsp->busycount = DSP_HISTORY;
/* Initialize DTMF detector */
ast_dtmf_detect_init(&dsp->td.dtmf);
/* Initialize initial DSP progress detect parameters */
ast_dsp_prog_reset(dsp);
}
return dsp;
}
void ast_dsp_set_features(struct ast_dsp *dsp, int features)
{
dsp->features = features;
}
void ast_dsp_free(struct ast_dsp *dsp)
{
free(dsp);
}
void ast_dsp_set_threshold(struct ast_dsp *dsp, int threshold)
{
dsp->threshold = threshold;
}
void ast_dsp_set_busy_count(struct ast_dsp *dsp, int cadences)
{
Martin Pycko
committed
if (cadences < 4)
cadences = 4;
if (cadences > DSP_HISTORY)
cadences = DSP_HISTORY;
dsp->busycount = cadences;
}
void ast_dsp_digitreset(struct ast_dsp *dsp)
{
int i;
dsp->thinkdigit = 0;
if (dsp->digitmode & DSP_DIGITMODE_MF) {
memset(dsp->td.mf.digits, 0, sizeof(dsp->td.mf.digits));
dsp->td.mf.current_digits = 0;
/* Reinitialise the detector for the next block */
for (i = 0; i < 6; i++) {
goertzel_reset(&dsp->td.mf.tone_out[i]);
#ifdef OLD_DSP_ROUTINES
#endif
#ifdef OLD_DSP_ROUTINES
dsp->td.mf.energy = 0.0;
dsp->td.mf.hit1 = dsp->td.mf.hit2 = dsp->td.mf.hit3 = dsp->td.mf.hit4 = dsp->td.mf.mhit = 0;
#else
dsp->td.mf.hits[4] = dsp->td.mf.hits[3] = dsp->td.mf.hits[2] = dsp->td.mf.hits[1] = dsp->td.mf.hits[0] = dsp->td.mf.mhit = 0;
#endif
dsp->td.mf.current_sample = 0;
} else {
memset(dsp->td.dtmf.digits, 0, sizeof(dsp->td.dtmf.digits));
dsp->td.dtmf.current_digits = 0;
/* Reinitialise the detector for the next block */
for (i = 0; i < 4; i++) {
goertzel_reset(&dsp->td.dtmf.row_out[i]);
goertzel_reset(&dsp->td.dtmf.col_out[i]);
#ifdef OLD_DSP_ROUTINES
goertzel_reset(&dsp->td.dtmf.row_out2nd[i]);
goertzel_reset(&dsp->td.dtmf.col_out2nd[i]);
#endif
#ifdef FAX_DETECT
#endif
#ifdef OLD_DSP_ROUTINES
#ifdef FAX_DETECT
#endif
dsp->td.dtmf.hit1 = dsp->td.dtmf.hit2 = dsp->td.dtmf.hit3 = dsp->td.dtmf.hit4 = dsp->td.dtmf.mhit = 0;
#else
dsp->td.dtmf.hits[2] = dsp->td.dtmf.hits[1] = dsp->td.dtmf.hits[0] = dsp->td.dtmf.mhit = 0;
#endif
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
dsp->td.dtmf.energy = 0.0;
dsp->td.dtmf.current_sample = 0;
}
}
void ast_dsp_reset(struct ast_dsp *dsp)
{
int x;
dsp->totalsilence = 0;
dsp->gsamps = 0;
for (x=0;x<4;x++)
dsp->freqs[x].v2 = dsp->freqs[x].v3 = 0.0;
memset(dsp->historicsilence, 0, sizeof(dsp->historicsilence));
memset(dsp->historicnoise, 0, sizeof(dsp->historicnoise));
}
int ast_dsp_digitmode(struct ast_dsp *dsp, int digitmode)
{
int new, old;
old = dsp->digitmode & (DSP_DIGITMODE_DTMF | DSP_DIGITMODE_MF | DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX);
new = digitmode & (DSP_DIGITMODE_DTMF | DSP_DIGITMODE_MF | DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX);
if (old != new) {
/* Must initialize structures if switching from MF to DTMF or vice-versa */
if (new & DSP_DIGITMODE_MF)
ast_mf_detect_init(&dsp->td.mf);
else
ast_dtmf_detect_init(&dsp->td.dtmf);
}
dsp->digitmode = digitmode;
return 0;
}
Martin Pycko
committed
int ast_dsp_set_call_progress_zone(struct ast_dsp *dsp, char *zone)
{
int x;
for (x=0;x<sizeof(aliases) / sizeof(aliases[0]);x++) {
if (!strcasecmp(aliases[x].name, zone)) {
dsp->progmode = aliases[x].mode;
ast_dsp_prog_reset(dsp);
return 0;
}
}
return -1;
}