spandsp  0.0.6
private/modem_connect_tones.h
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1 /*
2  * SpanDSP - a series of DSP components for telephony
3  *
4  * private/modem_connect_tones.c - Generation and detection of tones
5  * associated with modems calling and
6  * answering calls.
7  *
8  * Written by Steve Underwood <steveu@coppice.org>
9  *
10  * Copyright (C) 2006 Steve Underwood
11  *
12  * All rights reserved.
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU Lesser General Public License version 2.1,
16  * as published by the Free Software Foundation.
17  *
18  * This program is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21  * GNU Lesser General Public License for more details.
22  *
23  * You should have received a copy of the GNU Lesser General Public
24  * License along with this program; if not, write to the Free Software
25  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26  */
27 
28 /*! \file */
29 
30 #if !defined(_SPANDSP_PRIVATE_MODEM_CONNECT_TONES_H_)
31 #define _SPANDSP_PRIVATE_MODEM_CONNECT_TONES_H_
32 
33 /*!
34  Modem connect tones generator descriptor. This defines the state
35  of a single working instance of the tone generator.
36 */
38 {
39  int tone_type;
40 
41  int32_t tone_phase_rate;
42  uint32_t tone_phase;
43  int16_t level;
44  /*! \brief Countdown to the next phase hop */
45  int hop_timer;
46  /*! \brief Maximum duration timer */
48  uint32_t mod_phase;
49  int32_t mod_phase_rate;
50  int16_t mod_level;
51 };
52 
53 /*!
54  Modem connect tones receiver descriptor. This defines the state
55  of a single working instance of the tone detector.
56 */
58 {
59  /*! \brief The tone type being detected. */
60  int tone_type;
61  /*! \brief Callback routine, using to report detection of the tone. */
62  tone_report_func_t tone_callback;
63  /*! \brief An opaque pointer passed to tone_callback. */
65 
66  /*! \brief The notch filter state. */
67  float znotch_1;
68  float znotch_2;
69  /*! \brief The 15Hz AM filter state. */
70  float z15hz_1;
71  float z15hz_2;
72  /*! \brief The in notch power estimate */
73  int32_t notch_level;
74  /*! \brief The total channel power estimate */
75  int32_t channel_level;
76  /*! \brief The 15Hz AM power estimate */
77  int32_t am_level;
78  /*! \brief Sample counter for the small chunks of samples, after which a test is conducted. */
80  /*! \brief TRUE is the tone is currently confirmed present in the audio. */
82  /*! \brief */
83  int tone_on;
84  /*! \brief A millisecond counter, to time the duration of tone sections. */
86  /*! \brief A count of the number of good cycles of tone reversal seen. */
88  /*! \brief TRUE if the tone has been seen since the last time the user tested for it */
89  int hit;
90  /*! \brief A V.21 FSK modem context used when searching for FAX preamble. */
92  /*! \brief The raw (stuffed) bit stream buffer. */
93  unsigned int raw_bit_stream;
94  /*! \brief The current number of bits in the octet in progress. */
95  int num_bits;
96  /*! \brief Number of consecutive flags seen so far. */
98  /*! \brief TRUE if framing OK has been announced. */
100 };
101 
102 #endif
103 /*- End of file ------------------------------------------------------------*/
int32_t notch_level
The in notch power estimate.
Definition: private/modem_connect_tones.h:73
int framing_ok_announced
TRUE if framing OK has been announced.
Definition: private/modem_connect_tones.h:99
int hop_timer
Countdown to the next phase hop.
Definition: private/modem_connect_tones.h:45
int duration_timer
Maximum duration timer.
Definition: private/modem_connect_tones.h:47
Definition: private/fsk.h:58
int good_cycles
A count of the number of good cycles of tone reversal seen.
Definition: private/modem_connect_tones.h:87
int32_t channel_level
The total channel power estimate.
Definition: private/modem_connect_tones.h:75
int flags_seen
Number of consecutive flags seen so far.
Definition: private/modem_connect_tones.h:97
int num_bits
The current number of bits in the octet in progress.
Definition: private/modem_connect_tones.h:95
fsk_rx_state_t v21rx
A V.21 FSK modem context used when searching for FAX preamble.
Definition: private/modem_connect_tones.h:91
Definition: private/modem_connect_tones.h:37
int tone_cycle_duration
A millisecond counter, to time the duration of tone sections.
Definition: private/modem_connect_tones.h:85
int chunk_remainder
Sample counter for the small chunks of samples, after which a test is conducted.
Definition: private/modem_connect_tones.h:79
int32_t am_level
The 15Hz AM power estimate.
Definition: private/modem_connect_tones.h:77
Definition: private/modem_connect_tones.h:57
float z15hz_1
The 15Hz AM filter state.
Definition: private/modem_connect_tones.h:70
unsigned int raw_bit_stream
The raw (stuffed) bit stream buffer.
Definition: private/modem_connect_tones.h:93
void * callback_data
An opaque pointer passed to tone_callback.
Definition: private/modem_connect_tones.h:64
tone_report_func_t tone_callback
Callback routine, using to report detection of the tone.
Definition: private/modem_connect_tones.h:62
int tone_present
TRUE is the tone is currently confirmed present in the audio.
Definition: private/modem_connect_tones.h:81
float znotch_1
The notch filter state.
Definition: private/modem_connect_tones.h:67
int hit
TRUE if the tone has been seen since the last time the user tested for it.
Definition: private/modem_connect_tones.h:89
int tone_type
The tone type being detected.
Definition: private/modem_connect_tones.h:60