private/super_tone_rx.h

00001 /*
00002  * SpanDSP - a series of DSP components for telephony
00003  *
00004  * private/super_tone_rx.h - Flexible telephony supervisory tone detection.
00005  *
00006  * Written by Steve Underwood <steveu@coppice.org>
00007  *
00008  * Copyright (C) 2003 Steve Underwood
00009  *
00010  * All rights reserved.
00011  *
00012  * This program is free software; you can redistribute it and/or modify
00013  * it under the terms of the GNU Lesser General Public License version 2.1,
00014  * as published by the Free Software Foundation.
00015  *
00016  * This program is distributed in the hope that it will be useful,
00017  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00018  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019  * GNU Lesser General Public License for more details.
00020  *
00021  * You should have received a copy of the GNU Lesser General Public
00022  * License along with this program; if not, write to the Free Software
00023  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00024  *
00025  * $Id: super_tone_rx.h,v 1.1 2008/11/30 10:17:31 steveu Exp $
00026  */
00027 
00028 #if !defined(_SPANDSP_PRIVATE_SUPER_TONE_RX_H_)
00029 #define _SPANDSP_PRIVATE_SUPER_TONE_RX_H_
00030 
00031 #define BINS            128
00032 
00033 struct super_tone_rx_segment_s
00034 {
00035     int f1;
00036     int f2;
00037     int recognition_duration;
00038     int min_duration;
00039     int max_duration;
00040 };
00041 
00042 struct super_tone_rx_descriptor_s
00043 {
00044     int used_frequencies;
00045     int monitored_frequencies;
00046     int pitches[BINS/2][2];
00047     int tones;
00048     super_tone_rx_segment_t **tone_list;
00049     int *tone_segs;
00050     goertzel_descriptor_t *desc;
00051 };
00052 
00053 struct super_tone_rx_state_s
00054 {
00055     super_tone_rx_descriptor_t *desc;
00056     float energy;
00057     int detected_tone;
00058     int rotation;
00059     tone_report_func_t tone_callback;
00060     void (*segment_callback)(void *data, int f1, int f2, int duration);
00061     void *callback_data;
00062     super_tone_rx_segment_t segments[11];
00063     goertzel_state_t state[];
00064 };
00065 
00066 #endif
00067 /*- End of file ------------------------------------------------------------*/

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