mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-25 03:01:03 +00:00
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/*
|
|
* 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 ------------------------------------------------------------*/
|