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/*
* Header file for DTMF Receiver module, part of:
* 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.
*
* This module written by Stephen Underwood.
*/
/*
tone_detect.h - 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.
*/
#ifndef __TONE_DETECT_H__
#define __TONE_DETECT_H__
#include "_stdint.h"
typedef struct
{
float v2;
float v3;
float fac;
} goertzel_state_t;
#define MAX_DTMF_DIGITS 128
typedef struct
{
int hit1;
int hit2;
int hit3;
int hit4;
int mhit;
goertzel_state_t row_out[4];
goertzel_state_t col_out[4];
goertzel_state_t row_out2nd[4];
goertzel_state_t col_out2nd[4];
goertzel_state_t fax_tone;
goertzel_state_t fax_tone2nd;
float energy;
int current_sample;
char digits[MAX_DTMF_DIGITS + 1];
int current_digits;
int detected_digits;
int lost_digits;
int digit_hits[16];
int fax_hits;
} dtmf_detect_state_t;
typedef struct
{
float fac;
} tone_detection_descriptor_t;
void zap_goertzel_update(goertzel_state_t *s,
int16_t x[],
int samples);
float zap_goertzel_result (goertzel_state_t *s);
void zap_dtmf_detect_init (dtmf_detect_state_t *s);
int zap_dtmf_detect (dtmf_detect_state_t *s,
int16_t amp[],
int samples,
int isradio);
int zap_dtmf_get (dtmf_detect_state_t *s,
char *buf,
int max);
#endif /* __TONE_DETECT_H__ */
/*- End of file ------------------------------------------------------------*/
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