spandsp  3.0.0
private/v18.h
1 /*
2  * SpanDSP - a series of DSP components for telephony
3  *
4  * private/v18.h - V.18 text telephony for the deaf.
5  *
6  * Written by Steve Underwood <steveu@coppice.org>
7  *
8  * Copyright (C) 2004-2009 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_V18_H_)
27 #define _SPANDSP_PRIVATE_V18_H_
28 
30 {
31  /*! \brief True if we are the calling modem */
33  int mode;
34  int initial_mode;
35  int current_mode;
36  int nation;
37  put_msg_func_t put_msg;
38  void *user_data;
39  bool repeat_shifts;
40  bool autobauding;
41 
42  union
43  {
44  queue_state_t queue;
45  uint8_t buf[QUEUE_STATE_T_SIZE(128)];
46  } queue;
47  tone_gen_descriptor_t alert_tone_desc;
48  tone_gen_state_t alert_tone_gen;
49  fsk_tx_state_t fsk_tx;
50  dtmf_tx_state_t dtmf_tx;
51  async_tx_state_t async_tx;
52  int baudot_tx_shift;
53  int tx_signal_on;
54  bool tx_draining;
55  uint8_t next_byte;
56 
57  fsk_rx_state_t fsk_rx;
58  dtmf_rx_state_t dtmf_rx;
59 
60 #if defined(SPANDSP_USE_FIXED_POINTx)
61  /*! Minimum acceptable tone level for detection. */
62  int32_t threshold;
63  /*! The accumlating total energy on the same period over which the Goertzels work. */
64  int32_t energy;
65 #else
66  /*! Minimum acceptable tone level for detection. */
67  float threshold;
68  /*! The accumlating total energy on the same period over which the Goertzels work. */
69  float energy;
70 #endif
71  goertzel_state_t tone_390;
72  goertzel_state_t tone_980;
73  goertzel_state_t tone_1180;
74  goertzel_state_t tone_1270;
75  goertzel_state_t tone_1300;
76  goertzel_state_t tone_1400;
77  goertzel_state_t tone_1650;
78  goertzel_state_t tone_1800;
79  /*! The current sample number within a processing block. */
81  /*! Tone state duration */
82  int duration;
83  int target_duration;
84  int in_tone;
85 
86  int baudot_rx_shift;
87  int consecutive_ones;
88  uint8_t rx_msg[256 + 1];
89  int rx_msg_len;
90  int bit_pos;
91  int in_progress;
92  int rx_suppression;
93  int tx_suppression;
94 
95  /*! \brief Error and flow logging control */
97 };
98 
99 #endif
100 /*- End of file ------------------------------------------------------------*/
void(* put_msg_func_t)(void *user_data, const uint8_t *msg, int len)
Definition: async.h:95
Definition: private/async.h:35
Definition: private/dtmf.h:55
Definition: private/dtmf.h:34
Definition: private/fsk.h:59
Definition: private/fsk.h:34
Definition: tone_detect.h:46
Definition: private/logging.h:34
Definition: private/queue.h:34
Definition: private/tone_generate.h:43
Definition: private/tone_generate.h:54
Definition: private/v18.h:30
float threshold
Definition: private/v18.h:67
float energy
Definition: private/v18.h:69
logging_state_t logging
Error and flow logging control.
Definition: private/v18.h:96
int duration
Definition: private/v18.h:82
int current_sample
Definition: private/v18.h:80
bool calling_party
True if we are the calling modem.
Definition: private/v18.h:32