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comparison spandsp-0.0.6pre17/src/spandsp/private/fax_modems.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 * private/fax_modems.h - definitions for the analogue modem set for fax processing
5 *
6 * Written by Steve Underwood <steveu@coppice.org>
7 *
8 * Copyright (C) 2008 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: fax_modems.h,v 1.4 2009/09/04 14:38:47 steveu Exp $
26 */
27
28 /*! \file */
29
30 #if !defined(_SPANDSP_PRIVATE_FAX_MODEMS_H_)
31 #define _SPANDSP_PRIVATE_FAX_MODEMS_H_
32
33 /*!
34 The set of modems needed for FAX, plus the auxilliary stuff, like tone generation.
35 */
36 struct fax_modems_state_s
37 {
38 /*! TRUE is talker echo protection should be sent for the image modems */
39 int use_tep;
40
41 /*! If TRUE, transmit silence when there is nothing else to transmit. If FALSE return only
42 the actual generated audio. Note that this only affects untimed silences. Timed silences
43 (e.g. the 75ms silence between V.21 and a high speed modem) will alway be transmitted as
44 silent audio. */
45 int transmit_on_idle;
46
47 /*! \brief An HDLC context used when transmitting HDLC messages. */
48 hdlc_tx_state_t hdlc_tx;
49 /*! \brief An HDLC context used when receiving HDLC messages. */
50 hdlc_rx_state_t hdlc_rx;
51 /*! \brief A V.21 FSK modem context used when transmitting HDLC over V.21
52 messages. */
53 fsk_tx_state_t v21_tx;
54 /*! \brief A V.21 FSK modem context used when receiving HDLC over V.21
55 messages. */
56 fsk_rx_state_t v21_rx;
57 /*! \brief A V.17 modem context used when sending FAXes at 7200bps, 9600bps
58 12000bps or 14400bps */
59 v17_tx_state_t v17_tx;
60 /*! \brief A V.29 modem context used when receiving FAXes at 7200bps, 9600bps
61 12000bps or 14400bps */
62 v17_rx_state_t v17_rx;
63 /*! \brief A V.29 modem context used when sending FAXes at 7200bps or
64 9600bps */
65 v29_tx_state_t v29_tx;
66 /*! \brief A V.29 modem context used when receiving FAXes at 7200bps or
67 9600bps */
68 v29_rx_state_t v29_rx;
69 /*! \brief A V.27ter modem context used when sending FAXes at 2400bps or
70 4800bps */
71 v27ter_tx_state_t v27ter_tx;
72 /*! \brief A V.27ter modem context used when receiving FAXes at 2400bps or
73 4800bps */
74 v27ter_rx_state_t v27ter_rx;
75 /*! \brief Used to insert timed silences. */
76 silence_gen_state_t silence_gen;
77 /*! \brief CED or CNG generator */
78 modem_connect_tones_tx_state_t connect_tx;
79 /*! \brief CED or CNG detector */
80 modem_connect_tones_rx_state_t connect_rx;
81 /*! \brief */
82 dc_restore_state_t dc_restore;
83
84 /*! \brief The currently select receiver type */
85 int current_rx_type;
86 /*! \brief The currently select transmitter type */
87 int current_tx_type;
88
89 /*! \brief TRUE if a carrier is present. Otherwise FALSE. */
90 int rx_signal_present;
91 /*! \brief TRUE if a modem has trained correctly. */
92 int rx_trained;
93 /*! \brief TRUE if an HDLC frame has been received correctly. */
94 int rx_frame_received;
95
96 /*! The current receive signal handler */
97 span_rx_handler_t *rx_handler;
98 /*! The current receive missing signal fill-in handler */
99 span_rx_fillin_handler_t *rx_fillin_handler;
100 void *rx_user_data;
101
102 /*! The current transmit signal handler */
103 span_tx_handler_t *tx_handler;
104 void *tx_user_data;
105
106 /*! The next transmit signal handler, for two stage transmit operations.
107 E.g. a short silence followed by a modem signal. */
108 span_tx_handler_t *next_tx_handler;
109 void *next_tx_user_data;
110
111 /*! The current bit rate of the transmitter. */
112 int tx_bit_rate;
113 /*! The current bit rate of the receiver. */
114 int rx_bit_rate;
115
116 /*! If TRUE, transmission is in progress */
117 int transmit;
118 /*! \brief Audio logging file handle for received audio. */
119 int audio_rx_log;
120 /*! \brief Audio logging file handle for transmitted audio. */
121 int audio_tx_log;
122 /*! \brief Error and flow logging control */
123 logging_state_t logging;
124 };
125
126 #endif
127 /*- End of file ------------------------------------------------------------*/

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