/*
 * Header file for:
 *     BSD Telephony Of Mexico "Zapata" Telecom Library, version 1.10  12/9/01
 * 
 *   Part of the "Zapata" Computer Telephony Technology.
 *
 *   See http://www.bsdtelephony.com.mx
 *
 *
 *  The technologies, software, hardware, designs, drawings, scheumatics, board
 *  layouts and/or artwork, concepts, methodologies (including the use of all
 *  of these, and that which is derived from the use of all of these), all other
 *  intellectual properties contained herein, and all intellectual property
 *  rights have been and shall continue to be expressly for the benefit of all
 *  mankind, and are perpetually placed in the public domain, and may be used,
 *  copied, and/or modified by anyone, in any manner, for any legal purpose,
 *  without restriction.
 *
 */

#define NPOINTS 204		/* samples/run */
#define SAMPLERATE 8000
#define NCOEFF 16		/* nr of frequencies to be analyzed */
#define MNCOEFF 12		/* nr of frequencies to be analyzed (MF) */

#define DTMF_TRESH 700		/* min. volume for DTMF */
#define SILENCE_TRESH 500	/* max. volume for silence */
#define H2_TRESH   20000	/* 2nd harmonic */
#define MF_TRESH 700		/* min. volume for DTMF */

#define AMP_BITS  9		/* bits in amplitude -- can't be 16,
				   since we'd get integer overflows */

#define	SILENCE_LEVEL	16	/* max level for channel silence */


#define LOGRP 0
#define HIGRP 1

typedef struct {
  int freq;			/* frequency */
  int grp;			/* low/high group */
  int k;			/* k */
  int k2;			/* k for 1st harmonic */
} dtmf_t;

typedef struct {
  int freq;			/* frequency */
  int dur;			/* duration */
  int k;			/* k */
  int k2;			/* k for 1st harmonic */
} mf_t;

static mf_t mf_tones[6] = {
  { 700, 0, 0 },
  { 900, 0, 0 },
  { 1100, 0, 0 },
  { 1300,  0, 0 },
  { 1500,  0, 0 },
  { 1700,  0, 0 }
};

static char *mfs = 
"   1 23  45 6    78 9   0        CA *   B       #                ";

/* mfs[3] = '1'; mfs[5] = '2'; mfs[6] = '3'; mfs[9] = '4'; mfs[10] = '5';
mfs[12] = '6'; mfs[17] = '7'; mfs[18] = '8'; mfs[20] = '9'; mfs[24] = '0';
mfs[36] = '*'; mfs[48] = '#'; mfs[34] = 'A'; mfs[40] = 'B'; mfs[33] = 'C'; */