/*
*
Copyright (c) Eicon Networks, 2002.
*
This source file is supplied for the use with
Eicon Networks range of DIVA Server Adapters.
*
Eicon File Revision : 2.1
*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
*
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY OF ANY KIND WHATSOEVER INCLUDING ANY
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
*
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "platform.h"
#include "capidtmf.h"
/* #define TRACE_ */
#define FILE_ "CAPIDTMF.C"
/*---------------------------------------------------------------------------*/
#define trace(a)
/*---------------------------------------------------------------------------*/
static short capidtmf_expand_table_alaw[0x0100] =
{
-5504, 5504, -344, 344, -22016, 22016, -1376, 1376,
-2752, 2752, -88, 88, -11008, 11008, -688, 688,
-7552, 7552, -472, 472, -30208, 30208, -1888, 1888,
-3776, 3776, -216, 216, -15104, 15104, -944, 944,
-4480, 4480, -280, 280, -17920, 17920, -1120, 1120,
-2240, 2240, -24, 24, -8960, 8960, -560, 560,
-6528, 6528, -408, 408, -26112, 26112, -1632, 1632,
-3264, 3264, -152, 152, -13056, 13056, -816, 816,
-6016, 6016, -376, 376, -24064, 24064, -1504, 1504,
-3008, 3008, -120, 120, -12032, 12032, -752, 752,
-8064, 8064, -504, 504, -32256, 32256, -2016, 2016,
-4032, 4032, -248, 248, -16128, 16128, -1008, 1008,
-4992, 4992, -312, 312, -19968, 19968, -1248, 1248,
-2496, 2496, -56, 56, -9984, 9984, -624, 624,
-7040, 7040, -440, 440, -28160, 28160, -1760, 1760,
-3520, 3520, -184, 184, -14080, 14080, -880, 880,
-5248, 5248, -328, 328, -20992, 20992, -1312, 1312,
-2624, 2624, -72, 72, -10496, 10496, -656, 656,
-7296, 7296, -456, 456, -29184, 29184, -1824, 1824,
-3648, 3648, -200, 200, -14592, 14592, -912, 912,
-4224, 4224, -264, 264, -16896, 16896, -1056, 1056,
-2112, 2112, -8, 8, -8448, 8448, -528, 528,
-6272, 6272, -392, 392, -25088, 25088, -1568, 1568,
-3136, 3136, -136, 136, -12544, 12544, -784, 784,
-5760, 5760, -360, 360, -23040, 23040, -1440, 1440,
-2880, 2880, -104, 104, -11520, 11520, -720, 720,
-7808, 7808, -488, 488, -31232, 31232, -1952, 1952,
-3904, 3904, -232, 232, -15616, 15616, -976, 976,
-4736, 4736, -296, 296, -18944, 18944, -1184, 1184,
-2368, 2368, -40, 40, -9472, 9472, -592, 592,
-6784, 6784, -424, 424, -27136, 27136, -1696, 1696,
-3392, 3392, -168, 168, -13568, 13568, -848, 848
};
static short capidtmf_expand_table_ulaw[0x0100] =
{
-32124, 32124, -1884, 1884, -7932, 7932, -372, 372,
-15996, 15996, -876, 876, -3900, 3900, -120, 120,
-23932, 23932, -1372, 1372, -5884, 5884, -244, 244,
-11900, 11900, -620, 620, -2876, 2876, -56, 56,
-28028, 28028, -1628, 1628, -6908, 6908, -308, 308,
-13948, 13948, -748, 748, -3388, 3388, -88, 88,
-19836, 19836, -1116, 1116, -4860, 4860, -180, 180,
-9852, 9852, -492, 492, -2364, 2364, -24, 24,
-30076, 30076, -1756, 1756, -7420, 7420, -340, 340,
-14972, 14972, -812, 812, -3644, 3644, -104, 104,
-21884, 21884, -1244, 1244, -5372, 5372, -212, 212,
-10876, 10876, -556, 556, -2620, 2620, -40, 40,
-25980, 25980, -1500, 1500, -6396, 6396, -276, 276,
-12924, 12924, -684, 684, -3132, 3132, -72, 72,
-17788, 17788, -988, 988, -4348, 4348, -148, 148,
-8828, 8828, -428, 428, -2108, 2108, -8, 8,
-31100, 31100, -1820, 1820, -7676, 7676, -356, 356,
-15484, 15484, -844, 844, -3772, 3772, -112, 112,
-22908, 22908, -1308, 1308, -5628, 5628, -228, 228,
-11388, 11388, -588, 588, -2748, 2748, -48, 48,
-27004, 27004, -1564, 1564, -6652, 6652, -292, 292,
-13436, 13436, -716, 716, -3260, 3260, -80, 80,
-18812, 18812, -1052, 1052, -4604, 4604, -164, 164,
-9340, 9340, -460, 460, -2236, 2236, -16, 16,
-29052, 29052, -1692, 1692, -7164, 7164, -324, 324,
-14460, 14460, -780, 780, -3516, 3516, -96, 96,
-20860, 20860, -1180, 1180, -5116, 5116, -196, 196,
-10364, 10364, -524, 524, -2492, 2492, -32, 32,
-24956, 24956, -1436, 1436, -6140, 6140, -260, 260,
-12412, 12412, -652, 652, -3004, 3004, -64, 64,
-16764, 16764, -924, 924, -4092, 4092, -132, 132,
-8316, 8316, -396, 396, -1980, 1980, 0, 0
};
/*---------------------------------------------------------------------------*/
static short capidtmf_recv_window_function[CAPIDTMF_RECV_ACCUMULATE_CYCLES] =
{
-500L, -999L, -1499L, -1998L, -2496L, -2994L, -3491L, -3988L,
-4483L, -4978L, -5471L, -5963L, -6454L, -6943L, -7431L, -7917L,
-8401L, -8883L, -9363L, -9840L, -10316L, -10789L, -11259L, -11727L,
-12193L, -12655L, -13115L, -13571L, -14024L, -14474L, -14921L, -15364L,
-15804L, -16240L, -16672L, -17100L, -17524L, -17944L, -18360L, -18772L,
-19180L, -19583L, -19981L, -20375L, -20764L, -21148L, -21527L, -21901L,
-22270L, -22634L, -22993L, -23346L, -23694L, -24037L, -24374L, -24705L,
-25030L, -25350L, -25664L, -25971L, -26273L, -26568L, -26858L, -27141L,
-27418L, -27688L, -27952L, -28210L, -28461L, -28705L, -28943L, -29174L,
-29398L, -29615L, -29826L, -30029L, -30226L, -30415L, -30598L, -30773L,
-30941L, -31102L, -31256L, -31402L, -31541L, -31673L, -31797L, -31914L,
-32024L, -32126L, -32221L, -32308L, -32388L, -32460L, -32524L, -32581L,
-32631L, -32673L, -32707L, -32734L, -32753L, -32764L, -32768L, -32764L,
-32753L, -32734L, -32707L, -32673L, -32631L, -32581L, -32524L, -32460L,
-32388L, -32308L, -32221L, -32126L, -32024L, -31914L, -31797L, -31673L,
-31541L, -31402L, -31256L, -31102L, -30941L, -30773L, -30598L, -30415L,
-30226L, -30029L, -29826L, -29615L, -29398L, -29174L, -28943L, -28705L,
-28461L, -28210L, -27952L, -27688L, -27418L, -27141L, -26858L, -26568L,
-26273L, -25971L, -25664L, -25350L, -25030L, -24705L, -24374L, -24037L,
-23694L, -23346L, -22993L, -22634L, -22270L, -21901L, -21527L, -21148L,
-20764L, -20375L, -19981L, -19583L, -19180L, -18772L, -18360L, -17944L,
-17524L, -17100L, -16672L, -16240L, -15804L, -15364L, -14921L, -14474L,
-14024L, -13571L, -13115L, -12655L, -12193L, -11727L, -11259L, -10789L,
-10316L, -9840L, -9363L, -8883L, -8401L, -7917L, -7431L, -6943L,
-6454L, -5963L, -5471L, -4978L, -4483L, -3988L, -3491L, -2994L,
-2496L, -1998L, -1499L, -999L, -500L,
};
static byte capidtmf_leading_zeroes_table[0x100] =
{
8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
#define capidtmf_byte_leading_zeroes(b) (capidtmf_leading_zeroes_table[(BYTE)(b)])
#define capidtmf_word_leading_zeroes(w) (((w) & 0xff00) ? capidtmf_leading_zeroes_table[(w) >> 8] : 8 + capidtmf_leading_zeroes_table[(w)])
#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)]))
/*---------------------------------------------------------------------------*/
static void capidtmf_goertzel_loop(long *buffer, long *coeffs, short *sample, long count)
{
int i, j;
long c, d, q0, q1, q2;
for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT - 1; i++)
{
q1 = buffer[i];
q2 = buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];
d = coeffs[i] >> 1;
c = d << 1;
if (c >= 0)
{
for (j = 0; j < count; j++)
{
q0 = sample[j] - q2 + (c * (q1 >> 16)) + (((dword)(((dword) d) * ((dword)(q1 & 0xffff)))) >> 15);
q2 = q1;
q1 = q0;
}
}
else
{
c = -c;
d = -d;
for (j = 0; j < count; j++)
{
q0 = sample[j] - q2 - ((c * (q1 >> 16)) + (((dword)(((dword) d) * ((dword)(q1 & 0xffff)))) >> 15));
q2 = q1;
q1 = q0;
}
}
buffer[i] = q1;
buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = q2;
}
q1 = buffer[i];
q2 = buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];
c = (coeffs[i] >> 1) << 1;
if (c >= 0)
{
for (j = 0; j < count; j++)
{
q0 = sample[j] - q2 + (c * (q1 >> 16)) + (((dword)(((dword)(c >> 1)) * ((dword)(q1 & 0xffff)))) >> 15);
q2 = q1;
q1 = q0;
c -= CAPIDTMF_RECV_FUNDAMENTAL_DECREMENT;
}
}
else
{
c = -c;
for (j = 0; j < count; j++)
{
q0 = sample[j] - q2 - ((c * (q1 >> 16)) + (((dword)(((dword)(c >> 1)) * ((dword)(q1 & 0xffff)))) >> 15));
q2 = q1;
q1 = q0;
c += CAPIDTMF_RECV_FUNDAMENTAL_DECREMENT;
}
}
coeffs[i] = c;
buffer[i] = q1;
buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = q2;
}
static void capidtmf_goertzel_result(long *buffer, long *coeffs)
{
int i;
long d, e, q1, q2, lo, mid, hi;
dword k;
for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++)
{
q1 = buffer[i];
q2 = buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];
d = coeffs[i] >> 1;
if (d >= 0)
d = ((d << 1) * (-q1 >> 16)) + (((dword)(((dword) d) * ((dword)(-q1 & 0xffff)))) >> 15);
else
d = ((-d << 1) * (-q1 >> 16)) + (((dword)(((dword) -d) * ((dword)(-q1 & 0xffff)))) >> 15);
e = (q2 >= 0) ? q2 : -q2;
if (d >= 0)
{
k = ((dword)(d & 0xffff)) * ((dword)(e & 0xffff));
lo = k & 0xffff;
mid = k >> 16;
k = ((dword)(d >> 16)) * ((dword)(e & 0xffff));
mid += k & 0xffff;
hi = k >> 16;
k = ((dword)(d & 0xffff)) * ((dword)(e >> 16));
mid += k & 0xffff;
hi += k >> 16;
hi += ((dword)(d >> 16)) * ((dword)(e >> 16));
}
else
{
d = -d;
k = ((dword)(d & 0xffff)) * ((dword)(e & 0xffff));
lo = -((long)(k & 0xffff));
mid = -((long)(k >> 16));
k = ((dword)(d >> 16)) * ((dword)(e & 0xffff));
mid -= k & 0xffff;
hi = -((long)(k >> 16));
k = ((dword)(d & 0xffff)) * ((dword)(e >> 16));
mid -= k & 0xffff;
hi -= k >> 16;
hi -= ((dword)(d >> 16)) * ((dword)(e >> 16));
}
if (q2 < 0)
{
lo = -lo;
mid = -mid;
hi = -hi;
}
d = (q1 >= 0) ? q1 : -q1;
k = ((dword)(d & 0xffff)) * ((dword)(d & 0xffff));
lo += k & 0xffff;
mid += k >> 16;
k = ((dword)(d >> 16)) * ((dword)(d & 0xffff));
mid += (k & 0xffff) << 1;
hi += (k >> 16) << 1;
hi += ((dword)(d >> 16)) * ((dword)(d >> 16));
d = (q2 >= 0) ? q2 : -q2;
k = ((dword)(d & 0xffff)) * ((dword)(d & 0xffff));
lo += k & 0xffff;
mid += k >> 16;
k = ((dword)(d >> 16)) * ((dword)(d & 0xffff));
mid += (k & 0xffff) << 1;
hi += (k >> 16) << 1;
hi += ((dword)(d >> 16)) * ((dword)(d >> 16));
mid += lo >> 16;
hi += mid >> 16;
buffer[i] = (lo & 0xffff) | (mid << 16);
buffer[i + CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] = hi;
}
}
/*---------------------------------------------------------------------------*/
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_697 0
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_770 1
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_852 2
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_941 3
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1209 4
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1336 5
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1477 6
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1633 7
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_635 8
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1010 9
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1140 10
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1272 11
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1405 12
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1555 13
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1715 14
#define CAPIDTMF_RECV_GUARD_SNR_INDEX_1875 15
#define CAPIDTMF_RECV_GUARD_SNR_DONTCARE 0xc000
#define CAPIDTMF_RECV_NO_DIGIT 0xff
#define CAPIDTMF_RECV_TIME_GRANULARITY (CAPIDTMF_RECV_ACCUMULATE_CYCLES + 1)
#define CAPIDTMF_RECV_INDICATION_DIGIT 0x0001
static long capidtmf_recv_goertzel_coef_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] =
{
0xda97L * 2, /* 697 Hz (Low group 697 Hz) */
0xd299L * 2, /* 770 Hz (Low group 770 Hz) */
0xc8cbL * 2, /* 852 Hz (Low group 852 Hz) */
0xbd36L * 2, /* 941 Hz (Low group 941 Hz) */
0x9501L * 2, /* 1209 Hz (High group 1209 Hz) */
0x7f89L * 2, /* 1336 Hz (High group 1336 Hz) */
0x6639L * 2, /* 1477 Hz (High group 1477 Hz) */
0x48c6L * 2, /* 1633 Hz (High group 1633 Hz) */
0xe14cL * 2, /* 630 Hz (Lower guard of low group 631 Hz) */
0xb2e0L * 2, /* 1015 Hz (Upper guard of low group 1039 Hz) */
0xa1a0L * 2, /* 1130 Hz (Lower guard of high group 1140 Hz) */
0x8a87L * 2, /* 1272 Hz (Guard between 1209 Hz and 1336 Hz: 1271 Hz) */
0x7353L * 2, /* 1405 Hz (2nd harmonics of 697 Hz and guard between 1336 Hz and 1477 Hz: 1405 Hz) */
0x583bL * 2, /* 1552 Hz (2nd harmonics of 770 Hz and guard between 1477 Hz and 1633 Hz: 1553 Hz) */
0x37d8L * 2, /* 1720 Hz (2nd harmonics of 852 Hz and upper guard of high group: 1715 Hz) */
0x0000L * 2 /* 100-630 Hz (fundamentals) */
};
static word capidtmf_recv_guard_snr_low_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] =
{
14, /* Low group peak versus 697 Hz */
14, /* Low group peak versus 770 Hz */
16, /* Low group peak versus 852 Hz */
16, /* Low group peak versus 941 Hz */
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1209 Hz */
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1336 Hz */
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1477 Hz */
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1633 Hz */
14, /* Low group peak versus 635 Hz */
16, /* Low group peak versus 1010 Hz */
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1140 Hz */
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* Low group peak versus 1272 Hz */
DSPDTMF_RX_HARMONICS_SEL_DEFAULT - 8, /* Low group peak versus 1405 Hz */
DSPDTMF_RX_HARMONICS_SEL_DEFAULT - 4, /* Low group peak versus 1555 Hz */
DSPDTMF_RX_HARMONICS_SEL_DEFAULT - 4, /* Low group peak versus 1715 Hz */
12 /* Low group peak versus 100-630 Hz */
};
static word capidtmf_recv_guard_snr_high_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT] =
{
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 697 Hz */
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 770 Hz */
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 852 Hz */
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 941 Hz */
20, /* High group peak versus 1209 Hz */
20, /* High group peak versus 1336 Hz */
20, /* High group peak versus 1477 Hz */
20, /* High group peak versus 1633 Hz */
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 635 Hz */
CAPIDTMF_RECV_GUARD_SNR_DONTCARE, /* High group peak versus 1010 Hz */
16, /* High group peak versus 1140 Hz */
4, /* High group peak versus 1272 Hz */
6, /* High group peak versus 1405 Hz */
8, /* High group peak versus 1555 Hz */
16, /* High group peak versus 1715 Hz */
12 /* High group peak versus 100-630 Hz */
};
/*---------------------------------------------------------------------------*/
static void capidtmf_recv_init(t_capidtmf_state *p_state)
{
p_state->recv.min_gap_duration = 1;
p_state->recv.min_digit_duration = 1;
p_state->recv.cycle_counter = 0;
p_state->recv.current_digit_on_time = 0;
p_state->recv.current_digit_off_time = 0;
p_state->recv.current_digit_value = CAPIDTMF_RECV_NO_DIGIT;
p_state->recv.digit_write_pos = 0;
p_state->recv.digit_read_pos = 0;
p_state->recv.indication_state = 0;
p_state->recv.indication_state_ack = 0;
p_state->recv.state = CAPIDTMF_RECV_STATE_IDLE;
}
void capidtmf_recv_enable(t_capidtmf_state *p_state, word min_digit_duration, word min_gap_duration)
{
p_state->recv.indication_state_ack &= CAPIDTMF_RECV_INDICATION_DIGIT;
p_state->recv.min_digit_duration = (word)(((((dword) min_digit_duration) * 8) +
((dword)(CAPIDTMF_RECV_TIME_GRANULARITY / 2))) / ((dword) CAPIDTMF_RECV_TIME_GRANULARITY));
if (p_state->recv.min_digit_duration <= 1)
p_state->recv.min_digit_duration = 1;
else
(p_state->recv.min_digit_duration)--;
p_state->recv.min_gap_duration =
(word)((((dword) min_gap_duration) * 8) / ((dword) CAPIDTMF_RECV_TIME_GRANULARITY));
if (p_state->recv.min_gap_duration <= 1)
p_state->recv.min_gap_duration = 1;
else
(p_state->recv.min_gap_duration)--;
p_state->recv.state |= CAPIDTMF_RECV_STATE_DTMF_ACTIVE;
}
void capidtmf_recv_disable(t_capidtmf_state *p_state)
{
p_state->recv.state &= ~CAPIDTMF_RECV_STATE_DTMF_ACTIVE;
if (p_state->recv.state == CAPIDTMF_RECV_STATE_IDLE)
capidtmf_recv_init(p_state);
else
{
p_state->recv.cycle_counter = 0;
p_state->recv.current_digit_on_time = 0;
p_state->recv.current_digit_off_time = 0;
p_state->recv.current_digit_value = CAPIDTMF_RECV_NO_DIGIT;
}
}
word capidtmf_recv_indication(t_capidtmf_state *p_state, byte *buffer)
{
word i, j, k, flags;
flags = p_state->recv.indication_state ^ p_state->recv.indication_state_ack;
p_state->recv.indication_state_ack ^= flags & CAPIDTMF_RECV_INDICATION_DIGIT;
if (p_state->recv.digit_write_pos != p_state->recv.digit_read_pos)
{
i = 0;
k = p_state->recv.digit_write_pos;
j = p_state->recv.digit_read_pos;
do
{
buffer[i++] = p_state->recv.digit_buffer[j];
j = (j == CAPIDTMF_RECV_DIGIT_BUFFER_SIZE - 1) ? 0 : j + 1;
} while (j != k);
p_state->recv.digit_read_pos = k;
return (i);
}
p_state->recv.indication_state_ack ^= flags;
return (0);
}
#define CAPIDTMF_RECV_WINDOWED_SAMPLES 32
void capidtmf_recv_block(t_capidtmf_state *p_state, byte *buffer, word length)
{
byte result_digit;
word sample_number, cycle_counter, n, i;
word low_peak, high_peak;
dword lo, hi;
byte *p;
short *q;
byte goertzel_result_buffer[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT];
short windowed_sample_buffer[CAPIDTMF_RECV_WINDOWED_SAMPLES];
if (p_state->recv.state & CAPIDTMF_RECV_STATE_DTMF_ACTIVE)
{
cycle_counter = p_state->recv.cycle_counter;
sample_number = 0;
while (sample_number < length)
{
if (cycle_counter < CAPIDTMF_RECV_ACCUMULATE_CYCLES)
{
if (cycle_counter == 0)
{
for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++)
{
p_state->recv.goertzel_buffer[0][i] = 0;
p_state->recv.goertzel_buffer[1][i] = 0;
}
}
n = CAPIDTMF_RECV_ACCUMULATE_CYCLES - cycle_counter;
if (n > length - sample_number)
n = length - sample_number;
if (n > CAPIDTMF_RECV_WINDOWED_SAMPLES)
n = CAPIDTMF_RECV_WINDOWED_SAMPLES;
p = buffer + sample_number;
q = capidtmf_recv_window_function + cycle_counter;
if (p_state->ulaw)
{
for (i = 0; i < n; i++)
{
windowed_sample_buffer[i] =
(short)((capidtmf_expand_table_ulaw[p[i]] * ((long)(q[i]))) >> 15);
}
}
else
{
for (i = 0; i < n; i++)
{
windowed_sample_buffer[i] =
(short)((capidtmf_expand_table_alaw[p[i]] * ((long)(q[i]))) >> 15);
}
}
capidtmf_recv_goertzel_coef_table[CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT - 1] = CAPIDTMF_RECV_FUNDAMENTAL_OFFSET;
capidtmf_goertzel_loop(p_state->recv.goertzel_buffer[0],
capidtmf_recv_goertzel_coef_table, windowed_sample_buffer, n);
cycle_counter += n;
sample_number += n;
}
else
{
capidtmf_goertzel_result(p_state->recv.goertzel_buffer[0],
capidtmf_recv_goertzel_coef_table);
for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++)
{
lo = (dword)(p_state->recv.goertzel_buffer[0][i]);
hi = (dword)(p_state->recv.goertzel_buffer[1][i]);
if (hi != 0)
{
n = capidtmf_dword_leading_zeroes(hi);
hi = (hi << n) | (lo >> (32 - n));
}
else
{
n = capidtmf_dword_leading_zeroes(lo);
hi = lo << n;
n += 32;
}
n = 195 - 3 * n;
if (hi >= 0xcb300000L)
n += 2;
else if (hi >= 0xa1450000L)
n++;
goertzel_result_buffer[i] = (byte) n;
}
low_peak = DSPDTMF_RX_SENSITIVITY_LOW_DEFAULT;
result_digit = CAPIDTMF_RECV_NO_DIGIT;
for (i = 0; i < CAPIDTMF_LOW_GROUP_FREQUENCIES; i++)
{
if (goertzel_result_buffer[i] > low_peak)
{
low_peak = goertzel_result_buffer[i];
result_digit = (byte) i;
}
}
high_peak = DSPDTMF_RX_SENSITIVITY_HIGH_DEFAULT;
n = CAPIDTMF_RECV_NO_DIGIT;
for (i = CAPIDTMF_LOW_GROUP_FREQUENCIES; i < CAPIDTMF_RECV_BASE_FREQUENCY_COUNT; i++)
{
if (goertzel_result_buffer[i] > high_peak)
{
high_peak = goertzel_result_buffer[i];
n = (i - CAPIDTMF_LOW_GROUP_FREQUENCIES) << 2;
}
}
result_digit |= (byte) n;
if (low_peak + DSPDTMF_RX_HIGH_EXCEEDING_LOW_DEFAULT < high_peak)
result_digit = CAPIDTMF_RECV_NO_DIGIT;
if (high_peak + DSPDTMF_RX_LOW_EXCEEDING_HIGH_DEFAULT < low_peak)
result_digit = CAPIDTMF_RECV_NO_DIGIT;
n = 0;
for (i = 0; i < CAPIDTMF_RECV_TOTAL_FREQUENCY_COUNT; i++)
{
if ((((short)(low_peak - goertzel_result_buffer[i] - capidtmf_recv_guard_snr_low_table[i])) < 0)
|| (((short)(high_peak - goertzel_result_buffer[i] - capidtmf_recv_guard_snr_high_table[i])) < 0))
{
n++;
}
}
if (n != 2)
result_digit = CAPIDTMF_RECV_NO_DIGIT;
if (result_digit == CAPIDTMF_RECV_NO_DIGIT)
{
if (p_state->recv.current_digit_on_time != 0)
{
if (++(p_state->recv.current_digit_off_time) >= p_state->recv.min_gap_duration)
{
p_state->recv.current_digit_on_time = 0;
p_state->recv.current_digit_off_time = 0;
}
}
else
{
if (p_state->recv.current_digit_off_time != 0)
(p_state->recv.current_digit_off_time)--;
}
}
else
{
if ((p_state->recv.current_digit_on_time == 0)
&& (p_state->recv.current_digit_off_time != 0))
{
(p_state->recv.current_digit_off_time)--;
}
else
{
n = p_state->recv.current_digit_off_time;
if ((p_state->recv.current_digit_on_time != 0)
&& (result_digit != p_state->recv.current_digit_value))
{
p_state->recv.current_digit_on_time = 0;
n = 0;
}
p_state->recv.current_digit_value = result_digit;
p_state->recv.current_digit_off_time = 0;
if (p_state->recv.current_digit_on_time != 0xffff)
{
p_state->recv.current_digit_on_time += n + 1;
if (p_state->recv.current_digit_on_time >= p_state->recv.min_digit_duration)
{
p_state->recv.current_digit_on_time = 0xffff;
i = (p_state->recv.digit_write_pos == CAPIDTMF_RECV_DIGIT_BUFFER_SIZE - 1) ?
0 : p_state->recv.digit_write_pos + 1;
if (i == p_state->recv.digit_read_pos)
{
trace(dprintf("%s,%d: Receive digit overrun",
(char *)(FILE_), __LINE__));
}
else
{
p_state->recv.digit_buffer[p_state->recv.digit_write_pos] = result_digit;
p_state->recv.digit_write_pos = i;
p_state->recv.indication_state =
(p_state->recv.indication_state & ~CAPIDTMF_RECV_INDICATION_DIGIT) |
(~p_state->recv.indication_state_ack & CAPIDTMF_RECV_INDICATION_DIGIT);
}
}
}
}
}
cycle_counter = 0;
sample_number++;
}
}
p_state->recv.cycle_counter = cycle_counter;
}
}
void capidtmf_init(t_capidtmf_state *p_state, byte ulaw)
{
p_state->ulaw = ulaw;
capidtmf_recv_init(p_state);
}
/*---------------------------------------------------------------------------*/