Mercurial > hg > audiostuff
comparison spandsp-0.0.3/spandsp-0.0.3/src/spandsp/t38_terminal.h @ 5:f762bf195c4b
import spandsp-0.0.3
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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| date | Fri, 25 Jun 2010 16:00:21 +0200 |
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| 4:26cd8f1ef0b1 | 5:f762bf195c4b |
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| 1 /* | |
| 2 * SpanDSP - a series of DSP components for telephony | |
| 3 * | |
| 4 * t38_terminal.h - An implementation of T.38, less the packet exchange part | |
| 5 * | |
| 6 * Written by Steve Underwood <steveu@coppice.org> | |
| 7 * | |
| 8 * Copyright (C) 2005 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 General Public License version 2, as | |
| 14 * 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 General Public License for more details. | |
| 20 * | |
| 21 * You should have received a copy of the GNU General Public License | |
| 22 * along with this program; if not, write to the Free Software | |
| 23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 24 * | |
| 25 * $Id: t38_terminal.h,v 1.11 2006/12/07 13:22:26 steveu Exp $ | |
| 26 */ | |
| 27 | |
| 28 /*! \file */ | |
| 29 | |
| 30 #if !defined(_T38_TERMINAL_H_) | |
| 31 #define _T38_TERMINAL_H_ | |
| 32 | |
| 33 /*! \page t38_terminal_page T.38 real time FAX over IP termination | |
| 34 \section t38_terminal_page_sec_1 What does it do? | |
| 35 | |
| 36 \section t38_terminal_page_sec_2 How does it work? | |
| 37 */ | |
| 38 | |
| 39 #define T38_RX_BUF_LEN 2048 | |
| 40 #define T38_TX_BUF_LEN 16384 | |
| 41 | |
| 42 /* Make sure the HDLC frame buffers are big enough for ECM frames. */ | |
| 43 #define T38_MAX_HDLC_LEN 260 | |
| 44 | |
| 45 typedef struct | |
| 46 { | |
| 47 t38_core_state_t t38; | |
| 48 | |
| 49 uint8_t hdlc_tx_buf[T38_MAX_HDLC_LEN]; | |
| 50 int hdlc_tx_len; | |
| 51 int hdlc_tx_ptr; | |
| 52 int timed_step; | |
| 53 | |
| 54 uint8_t tx_data[T38_TX_BUF_LEN]; | |
| 55 int tx_out_bytes; | |
| 56 | |
| 57 int next_tx_indicator; | |
| 58 int current_tx_data_type; | |
| 59 | |
| 60 /*! \brief TRUE is a carrier is presnt. Otherwise FALSE. */ | |
| 61 int rx_signal_present; | |
| 62 | |
| 63 /*! \brief A tone generator context used to generate supervisory tones during | |
| 64 FAX handling. */ | |
| 65 tone_gen_state_t tone_gen; | |
| 66 | |
| 67 t30_state_t t30_state; | |
| 68 | |
| 69 int current_rx_type; | |
| 70 int current_tx_type; | |
| 71 | |
| 72 /*! \brief TRUE is there has been some T.38 data missed */ | |
| 73 int missing_data; | |
| 74 | |
| 75 /*! The number of octets to send in each image packet (non-ECM or ECM) at the current | |
| 76 rate and the current specified packet interval. */ | |
| 77 int octets_per_data_packet; | |
| 78 | |
| 79 int32_t samples; | |
| 80 int32_t next_tx_samples; | |
| 81 int32_t timeout_rx_samples; | |
| 82 | |
| 83 logging_state_t logging; | |
| 84 } t38_terminal_state_t; | |
| 85 | |
| 86 #ifdef __cplusplus | |
| 87 extern "C" { | |
| 88 #endif | |
| 89 | |
| 90 int t38_terminal_send_timeout(t38_terminal_state_t *s, int samples); | |
| 91 | |
| 92 /*! \brief Initialise a termination mode T.38 context. | |
| 93 \param s The T.38 context. | |
| 94 \param calling_party TRUE if the context is for a calling party. FALSE if the | |
| 95 context is for an answering party. | |
| 96 \param tx_packet_handler A callback routine to encapsulate and transmit T.38 packets. | |
| 97 \param tx_packet_user_data An opaque pointer passed to the tx_packet_handler routine. | |
| 98 \return A pointer to the termination mode T.38 context, or NULL if there was a problem. */ | |
| 99 t38_terminal_state_t *t38_terminal_init(t38_terminal_state_t *s, | |
| 100 int calling_party, | |
| 101 t38_tx_packet_handler_t *tx_packet_handler, | |
| 102 void *tx_packet_user_data); | |
| 103 | |
| 104 #ifdef __cplusplus | |
| 105 } | |
| 106 #endif | |
| 107 | |
| 108 #endif | |
| 109 /*- End of file ------------------------------------------------------------*/ |