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comparison spandsp-0.0.6pre17/src/spandsp/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 * 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 1.11 2009/04/26 12:55:23 steveu Exp $
26 */
27
28 /*! \file */
29
30 #if !defined(_SPANDSP_FAX_MODEMS_H_)
31 #define _SPANDSP_FAX_MODEMS_H_
32
33 enum
34 {
35 FAX_MODEM_NONE = -1,
36 FAX_MODEM_FLUSH = 0,
37 FAX_MODEM_SILENCE_TX,
38 FAX_MODEM_SILENCE_RX,
39 FAX_MODEM_CED_TONE,
40 FAX_MODEM_CNG_TONE,
41 FAX_MODEM_NOCNG_TONE,
42 FAX_MODEM_V21_TX,
43 FAX_MODEM_V17_TX,
44 FAX_MODEM_V27TER_TX,
45 FAX_MODEM_V29_TX,
46 FAX_MODEM_V21_RX,
47 FAX_MODEM_V17_RX,
48 FAX_MODEM_V27TER_RX,
49 FAX_MODEM_V29_RX
50 };
51
52 /*!
53 The set of modems needed for FAX, plus the auxilliary stuff, like tone generation.
54 */
55 typedef struct fax_modems_state_s fax_modems_state_t;
56
57 #if defined(__cplusplus)
58 extern "C"
59 {
60 #endif
61
62 /* N.B. the following are currently a work in progress */
63 SPAN_DECLARE(int) fax_modems_v17_v21_rx(void *user_data, const int16_t amp[], int len);
64 SPAN_DECLARE(int) fax_modems_v27ter_v21_rx(void *user_data, const int16_t amp[], int len);
65 SPAN_DECLARE(int) fax_modems_v29_v21_rx(void *user_data, const int16_t amp[], int len);
66 SPAN_DECLARE(int) fax_modems_v17_v21_rx_fillin(void *user_data, int len);
67 SPAN_DECLARE(int) fax_modems_v27ter_v21_rx_fillin(void *user_data, int len);
68 SPAN_DECLARE(int) fax_modems_v29_v21_rx_fillin(void *user_data, int len);
69 SPAN_DECLARE(void) fax_modems_start_rx_modem(fax_modems_state_t *s, int which);
70
71 SPAN_DECLARE(void) fax_modems_set_tep_mode(fax_modems_state_t *s, int use_tep);
72
73 SPAN_DECLARE(fax_modems_state_t *) fax_modems_init(fax_modems_state_t *s,
74 int use_tep,
75 hdlc_frame_handler_t hdlc_accept,
76 hdlc_underflow_handler_t hdlc_tx_underflow,
77 put_bit_func_t non_ecm_put_bit,
78 get_bit_func_t non_ecm_get_bit,
79 tone_report_func_t tone_callback,
80 void *user_data);
81
82 SPAN_DECLARE(int) fax_modems_release(fax_modems_state_t *s);
83
84 SPAN_DECLARE(int) fax_modems_free(fax_modems_state_t *s);
85
86 #if defined(__cplusplus)
87 }
88 #endif
89
90 #endif
91 /*- End of file ------------------------------------------------------------*/

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