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