Mercurial > hg > audiostuff
comparison spandsp-0.0.6pre17/src/spandsp/private/t38_terminal.h @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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| date | Fri, 25 Jun 2010 15:50:58 +0200 |
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| 3:c6c5a16ce2f2 | 4:26cd8f1ef0b1 |
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| 1 /* | |
| 2 * SpanDSP - a series of DSP components for telephony | |
| 3 * | |
| 4 * private/t38_terminal.h - T.38 termination, 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 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: t38_terminal.h,v 1.2 2008/12/31 13:57:13 steveu Exp $ | |
| 26 */ | |
| 27 | |
| 28 /*! \file */ | |
| 29 | |
| 30 #if !defined(_SPANDSP_PRIVATE_T38_TERMINAL_H_) | |
| 31 #define _SPANDSP_PRIVATE_T38_TERMINAL_H_ | |
| 32 | |
| 33 typedef struct | |
| 34 { | |
| 35 /*! \brief Internet Aware FAX mode bit mask. */ | |
| 36 int iaf; | |
| 37 /*! \brief Required time between T.38 transmissions, in ms. */ | |
| 38 int ms_per_tx_chunk; | |
| 39 /*! \brief Bit fields controlling the way data is packed into chunked for transmission. */ | |
| 40 int chunking_modes; | |
| 41 | |
| 42 /*! \brief Core T.38 IFP support */ | |
| 43 t38_core_state_t t38; | |
| 44 | |
| 45 /*! \brief The current transmit step being timed */ | |
| 46 int timed_step; | |
| 47 | |
| 48 /*! \brief TRUE is there has been some T.38 data missed (i.e. lost packets) in the current | |
| 49 reception period. */ | |
| 50 int rx_data_missing; | |
| 51 | |
| 52 /*! \brief The number of octets to send in each image packet (non-ECM or ECM) at the current | |
| 53 rate and the current specified packet interval. */ | |
| 54 int octets_per_data_packet; | |
| 55 | |
| 56 struct | |
| 57 { | |
| 58 /*! \brief HDLC receive buffer */ | |
| 59 uint8_t buf[T38_MAX_HDLC_LEN]; | |
| 60 /*! \brief The length of the contents of the HDLC receive buffer */ | |
| 61 int len; | |
| 62 } hdlc_rx; | |
| 63 | |
| 64 struct | |
| 65 { | |
| 66 /*! \brief HDLC transmit buffer */ | |
| 67 uint8_t buf[T38_MAX_HDLC_LEN]; | |
| 68 /*! \brief The length of the contents of the HDLC transmit buffer */ | |
| 69 int len; | |
| 70 /*! \brief Current pointer within the contents of the HDLC transmit buffer */ | |
| 71 int ptr; | |
| 72 /*! \brief The number of extra bits in a fully stuffed version of the | |
| 73 contents of the HDLC transmit buffer. This is needed to accurately | |
| 74 estimate the playout time for this frame, through an analogue modem. */ | |
| 75 int extra_bits; | |
| 76 } hdlc_tx; | |
| 77 | |
| 78 /*! \brief Counter for trailing non-ECM bytes, used to flush out the far end's modem. */ | |
| 79 int non_ecm_trailer_bytes; | |
| 80 | |
| 81 /*! \brief The next T.38 indicator queued for transmission. */ | |
| 82 int next_tx_indicator; | |
| 83 /*! \brief The current T.38 data type being transmitted. */ | |
| 84 int current_tx_data_type; | |
| 85 | |
| 86 /*! \brief TRUE if a carrier is present. Otherwise FALSE. */ | |
| 87 int rx_signal_present; | |
| 88 | |
| 89 /*! \brief The current operating mode of the receiver. */ | |
| 90 int current_rx_type; | |
| 91 /*! \brief The current operating mode of the transmitter. */ | |
| 92 int current_tx_type; | |
| 93 | |
| 94 /*! \brief Current transmission bit rate. */ | |
| 95 int tx_bit_rate; | |
| 96 /*! \brief A "sample" count, used to time events. */ | |
| 97 int32_t samples; | |
| 98 /*! \brief The value for samples at the next transmission point. */ | |
| 99 int32_t next_tx_samples; | |
| 100 /*! \brief The current receive timeout. */ | |
| 101 int32_t timeout_rx_samples; | |
| 102 } t38_terminal_front_end_state_t; | |
| 103 | |
| 104 /*! | |
| 105 T.38 terminal state. | |
| 106 */ | |
| 107 struct t38_terminal_state_s | |
| 108 { | |
| 109 /*! \brief The T.30 back-end */ | |
| 110 t30_state_t t30; | |
| 111 | |
| 112 /*! \brief The T.38 front-end */ | |
| 113 t38_terminal_front_end_state_t t38_fe; | |
| 114 | |
| 115 /*! \brief Error and flow logging control */ | |
| 116 logging_state_t logging; | |
| 117 }; | |
| 118 | |
| 119 #endif | |
| 120 /*- End of file ------------------------------------------------------------*/ |