/*---------------------------------------------------------------------------*\ FILE....: envtone.cpp TYPE....: C++ Module AUTHOR..: David Rowe DATE....: 1/11/01 Routines for programming the VPB call progress detector from tones specified by environment variables. Voicetronix Voice Processing Board (VPB) Software Copyright (C) 1999-2007 Voicetronix www.voicetronix.com.au This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA \*---------------------------------------------------------------------------*/ #include #include "vpbapi.h" #include "vpbtoned.h" #include "mess.h" #include #include // +/- % this value tolerance in on/off time for pulsed tones #define TONE_TOL 25 static char *next_arg_str(char *p, char *str) { char *pnew; int len; *str = 0; if (p == NULL) return NULL; pnew = strchr(p, ','); if (pnew != NULL) { // comma found len = pnew-p; pnew++; } else len = strlen(p); // last value in string memcpy(str, p, len); str[len] = 0; return pnew; } static char *next_arg_int(char *p, int *i) { char tmp[VPB_MAX_STR]; int itmp; p = next_arg_str(p, tmp); itmp = atoi(tmp); *i = itmp; return p; } static void init_tone_continuous(VPB_DETECT *cont) { // Continuous tone detector prototype (e.g. dial tone) cont->nstates = 2; cont->tone_id = VPB_DIAL; cont->ntones = 1; cont->freq1 = 400; cont->bandwidth1 = 100; cont->freq2 = 0; cont->bandwidth2 = 0; cont->minlevel1 = -40; cont->minlevel2 = 0; cont->twist = 0; cont->snr = 10; cont->glitch = 40; cont->stran[0].type = VPB_RISING; cont->stran[0].tfire = 0; cont->stran[0].tmin = 0; cont->stran[0].tmax = 0; cont->stran[1].type = VPB_TIMER; cont->stran[1].tfire = 2000; cont->stran[1].tmin = 0; cont->stran[1].tmax = 0; } static void init_tone_pulsed(VPB_DETECT *pulsed) { // Pulsed tone detector prototype (e.g. busy tone) pulsed->nstates = 2; pulsed->tone_id = VPB_BUSY; pulsed->ntones = 1; pulsed->freq1 = 400; pulsed->bandwidth1 = 200; pulsed->freq2 = 0; pulsed->bandwidth2 = 0; pulsed->minlevel1 = -40; pulsed->minlevel2 = 0; pulsed->twist = 0; pulsed->snr = 10; pulsed->glitch = 40; pulsed->stran[0].type = VPB_RISING; pulsed->stran[0].tfire = 0; pulsed->stran[0].tmin = 0; pulsed->stran[0].tmax = 0; pulsed->stran[1].type = VPB_FALLING; pulsed->stran[1].tfire = 0; pulsed->stran[1].tmin = 200; pulsed->stran[1].tmax = 300; // optional third state (P2 type tones only) pulsed->stran[2].type = VPB_RISING; pulsed->stran[2].tfire = 0; pulsed->stran[2].tmin = 200; pulsed->stran[2].tmax = 300; } /*---------------------------------------------------------------------------*\ FUNCTION: envtone_read_tone_from_env AUTHOR..: David Rowe DATE....: 1/11/01 Reads environment variables to program tone detectors. Allows configuring up to 3 tone detectors to be set without compiling, or writing code. JK 15/04/02 Modified to support changes to twist characteristics (Allowable magnitude difference between the dual tones). Max allowable twist = 20 dB. JK 7/04/02 Modified to support dual tone characteristics and changes to the SNR threshold on the tone detector. This can be done by specifying P3, P4 or P5 in the second argument. Env. variables defining tones are defined as follows (bash shell): export VPB_TONE[0..2]=,,,,