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comparison spandsp-0.0.6pre17/src/spandsp/private/bell_r2_mf.h @ 4:26cd8f1ef0b1

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import spandsp-0.0.6pre17
author Peter Meerwald <pmeerw@cosy.sbg.ac.at>
date Fri, 25 Jun 2010 15:50:58 +0200
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3:c6c5a16ce2f2 4:26cd8f1ef0b1
1 /*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * bell_r2_mf.h - Bell MF and MFC/R2 tone generation and detection.
5 *
6 * Written by Steve Underwood <steveu@coppice.org>
7 *
8 * Copyright (C) 2001 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 * $Id: bell_r2_mf.h,v 1.2 2008/10/13 14:19:18 steveu Exp $
26 */
27
28 #if !defined(_SPANDSP_PRIVATE_BELL_R2_MF_H_)
29 #define _SPANDSP_PRIVATE_BELL_R2_MF_H_
30
31 /*!
32 Bell MF generator state descriptor. This defines the state of a single
33 working instance of a Bell MF generator.
34 */
35 struct bell_mf_tx_state_s
36 {
37 /*! The tone generator. */
38 tone_gen_state_t tones;
39 int current_sample;
40 union
41 {
42 queue_state_t queue;
43 uint8_t buf[QUEUE_STATE_T_SIZE(MAX_BELL_MF_DIGITS)];
44 } queue;
45 };
46
47 /*!
48 Bell MF digit detector descriptor.
49 */
50 struct bell_mf_rx_state_s
51 {
52 /*! Optional callback funcion to deliver received digits. */
53 digits_rx_callback_t digits_callback;
54 /*! An opaque pointer passed to the callback function. */
55 void *digits_callback_data;
56 /*! Tone detector working states */
57 goertzel_state_t out[6];
58 /*! Short term history of results from the tone detection, using in persistence checking */
59 uint8_t hits[5];
60 /*! The current sample number within a processing block. */
61 int current_sample;
62
63 /*! The number of digits which have been lost due to buffer overflows. */
64 int lost_digits;
65 /*! The number of digits currently in the digit buffer. */
66 int current_digits;
67 /*! The received digits buffer. This is a NULL terminated string. */
68 char digits[MAX_BELL_MF_DIGITS + 1];
69 };
70
71 /*!
72 MFC/R2 tone detector descriptor.
73 */
74 struct r2_mf_tx_state_s
75 {
76 /*! The tone generator. */
77 tone_gen_state_t tone;
78 /*! TRUE if generating forward tones, otherwise generating reverse tones. */
79 int fwd;
80 /*! The current digit being generated. */
81 int digit;
82 };
83
84 /*!
85 MFC/R2 tone detector descriptor.
86 */
87 struct r2_mf_rx_state_s
88 {
89 /*! Optional callback funcion to deliver received digits. */
90 tone_report_func_t callback;
91 /*! An opaque pointer passed to the callback function. */
92 void *callback_data;
93 /*! TRUE is we are detecting forward tones. FALSE if we are detecting backward tones */
94 int fwd;
95 /*! Tone detector working states */
96 goertzel_state_t out[6];
97 /*! The current sample number within a processing block. */
98 int current_sample;
99 /*! The currently detected digit. */
100 int current_digit;
101 };
102
103 #endif
104 /*- End of file ------------------------------------------------------------*/

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