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87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
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/*
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* Header file for DTMF Receiver module, part of:
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* BSD Telephony Of Mexico "Zapata" Telecom Library, version 1.10 12/9/01
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*
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* Part of the "Zapata" Computer Telephony Technology.
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*
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* See http://www.bsdtelephony.com.mx
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*
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*
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* The technologies, software, hardware, designs, drawings, scheumatics, board
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* layouts and/or artwork, concepts, methodologies (including the use of all
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* of these, and that which is derived from the use of all of these), all other
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* intellectual properties contained herein, and all intellectual property
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* rights have been and shall continue to be expressly for the benefit of all
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* mankind, and are perpetually placed in the public domain, and may be used,
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* copied, and/or modified by anyone, in any manner, for any legal purpose,
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* without restriction.
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*
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* This module written by Stephen Underwood.
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*/
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/*
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tone_detect.h - General telephony tone detection, and specific
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detection of DTMF.
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Copyright (C) 2001 Steve Underwood <steveu@coppice.org>
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Despite my general liking of the GPL, I place this code in the
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public domain for the benefit of all mankind - even the slimy
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ones who might try to proprietize my work and use it to my
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detriment.
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*/
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typedef struct
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{
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float v2;
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float v3;
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float fac;
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} goertzel_state_t;
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#define MAX_DTMF_DIGITS 128
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typedef struct
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{
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int hit1;
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int hit2;
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int hit3;
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int hit4;
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int mhit;
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goertzel_state_t row_out[4];
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goertzel_state_t col_out[4];
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goertzel_state_t row_out2nd[4];
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goertzel_state_t col_out2nd[4];
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goertzel_state_t fax_tone;
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goertzel_state_t fax_tone2nd;
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float energy;
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int current_sample;
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char digits[MAX_DTMF_DIGITS + 1];
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int current_digits;
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int detected_digits;
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int lost_digits;
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int digit_hits[16];
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int fax_hits;
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} dtmf_detect_state_t;
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typedef struct
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{
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float fac;
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} tone_detection_descriptor_t;
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void zap_goertzel_update(goertzel_state_t *s,
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int16_t x[],
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int samples);
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float zap_goertzel_result (goertzel_state_t *s);
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void zap_dtmf_detect_init (dtmf_detect_state_t *s);
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int zap_dtmf_detect (dtmf_detect_state_t *s,
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int16_t amp[],
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int samples,
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int isradio);
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int zap_dtmf_get (dtmf_detect_state_t *s,
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char *buf,
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int max);
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/*- End of file ------------------------------------------------------------*/
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