spandsp: super_tone_rx.h Source File

spandsp 0.0.6

private/super_tone_rx.h
1/*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * private/super_tone_rx.h - Flexible telephony supervisory tone detection.
5 *
6 * Written by Steve Underwood <steveu@coppice.org>
7 *
8 * Copyright (C) 2003 Steve Underwood
9 *
10 * All rights reserved.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Lesser General Public License version 2.1,
14 * as published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26#if !defined(_SPANDSP_PRIVATE_SUPER_TONE_RX_H_)
27#define _SPANDSP_PRIVATE_SUPER_TONE_RX_H_
28
29#define SUPER_TONE_BINS 128
30
31 struct super_tone_rx_segment_s
32{
33 int f1;
34 int f2;
35 int recognition_duration;
36 int min_duration;
37 int max_duration;
38};
39
40 struct super_tone_rx_descriptor_s
41{
42 int used_frequencies;
43 int monitored_frequencies;
44 int pitches[SUPER_TONE_BINS/2][2];
45 int tones;
46 super_tone_rx_segment_t **tone_list;
47 int *tone_segs;
48 goertzel_descriptor_t *desc;
49};
50
51 struct super_tone_rx_state_s
52{
53 super_tone_rx_descriptor_t *desc;
54 float energy;
55 int detected_tone;
56 int rotation;
57 tone_report_func_t tone_callback;
58 tone_segment_func_t segment_callback;
59 void *callback_data;
60 super_tone_rx_segment_t segments[11];
61 goertzel_state_t state[];
62};
63
64#endif
65/*- End of file ------------------------------------------------------------*/
super_tone_rx_descriptor_s
Definition private/super_tone_rx.h:41
super_tone_rx_segment_s
Definition private/super_tone_rx.h:32
super_tone_rx_state_s
Definition private/super_tone_rx.h:52