spandsp 0.0.6
private/t30.h
Go to the documentation of this file.
1/*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * private/t30.h - definitions for T.30 fax processing
5 *
6 * Written by Steve Underwood <steveu@coppice.org>
7 *
8 * Copyright (C) 2003 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/*! \file */
27
28#if !defined(_SPANDSP_PRIVATE_T30_H_)
29#define _SPANDSP_PRIVATE_T30_H_
30
31/*!
32 T.30 FAX channel descriptor. This defines the state of a single working
33 instance of a T.30 FAX channel.
34*/
36{
37 /*! \brief T.4 context for reading or writing image data. */
38 union
39 {
40 t4_rx_state_t rx;
41 t4_tx_state_t tx;
42 } t4;
43 /*! \brief The type of FAX operation currently in progress */
45
46 /*! \brief True if behaving as the calling party */
48
49 /*! \brief Internet aware FAX mode bit mask. */
50 int iaf;
51 /*! \brief A bit mask of the currently supported modem types. */
53 /*! \brief A bit mask of the currently supported image compression modes. */
55 /*! \brief A bit mask of the currently supported image resolutions. */
57 /*! \brief A bit mask of the currently supported image sizes. */
59 /*! \brief A bit mask of the currently supported T.30 special features. */
61 /*! \brief True is ECM mode handling is enabled. */
63 /*! \brief True if we are capable of retransmitting pages */
65
66 /*! \brief The received DCS, formatted as an ASCII string, for inclusion
67 in the TIFF file. */
69 /*! \brief The text which will be used in FAX page header. No text results
70 in no header line. */
72 /*! \brief True for FAX page headers to overlay (i.e. replace) the beginning of the
73 page image. False for FAX page headers to add to the overall length of
74 the page. */
76 /*! \brief Use private timezone if true */
78 /*! \brief Optional per instance time zone for the FAX page header timestamp. */
79 tz_t tz;
80
81 /*! \brief True if remote T.30 procedural interrupts are allowed. */
83
84 /*! \brief The information fields received. */
86 /*! \brief The information fields to be transmitted. */
88 /*! \brief The country of origin of the remote machine, if known, else NULL. */
89 const char *country;
90 /*! \brief The vendor of the remote machine, if known, else NULL. */
91 const char *vendor;
92 /*! \brief The model of the remote machine, if known, else NULL. */
93 const char *model;
94
95 /*! \brief A pointer to a callback routine to be called when phase B events
96 occur. */
98 /*! \brief An opaque pointer supplied in event B callbacks. */
100 /*! \brief A pointer to a callback routine to be called when phase D events
101 occur. */
103 /*! \brief An opaque pointer supplied in event D callbacks. */
105 /*! \brief A pointer to a callback routine to be called when phase E events
106 occur. */
108 /*! \brief An opaque pointer supplied in event E callbacks. */
110 /*! \brief A pointer to a callback routine to be called when frames are
111 exchanged. */
113 /*! \brief An opaque pointer supplied in real time frame callbacks. */
115
116 /*! \brief A pointer to a callback routine to be called when document events
117 (e.g. end of transmitted document) occur. */
119 /*! \brief An opaque pointer supplied in document callbacks. */
121
122 /*! \brief The handler for changes to the receive mode */
124 /*! \brief An opaque pointer passed to the handler for changes to the receive mode */
126 /*! \brief The handler for changes to the transmit mode */
128 /*! \brief An opaque pointer passed to the handler for changes to the transmit mode */
130
131 /*! \brief The transmitted HDLC frame handler. */
133 /*! \brief An opaque pointer passed to the transmitted HDLC frame handler. */
135
136 /*! \brief The DIS code for the minimum scan row time we require. This is usually 0ms,
137 but if we are trying to simulate another type of FAX machine, we may need a non-zero
138 value here. */
140
141 /*! \brief The current T.30 phase. */
142 int phase;
143 /*! \brief The T.30 phase to change to when the current phase ends. */
145 /*! \brief The current state of the T.30 state machine. */
146 int state;
147 /*! \brief The step in sending a sequence of HDLC frames. */
148 int step;
149
150 /*! \brief The preparation buffer for the DCS message to be transmitted. */
152 /*! \brief The length of the DCS message to be transmitted. */
154 /*! \brief The preparation buffer for DIS or DTC message to be transmitted. */
156 /*! \brief The length of the DIS or DTC message to be transmitted. */
158 /*! \brief The last DIS or DTC message received form the far end. */
160 /*! \brief The length of the last DIS or DTC message received form the far end. */
162 /*! \brief True if a valid DIS has been received from the far end. */
164
165 /*! \brief True if the short training sequence should be used. */
167
168 /*! \brief True if an image carrier appears to have been received, even if it did not successfully
169 train. */
171
172 /*! \brief A count of the number of bits in the trainability test. This counts down to zero when
173 sending TCF, and counts up when receiving it. */
175 /*! \brief The current count of consecutive received zero bits, during the trainability test. */
177 /*! \brief The maximum consecutive received zero bits seen to date, during the trainability test. */
179
180 /*! \brief The current fallback step for the fast message transfer modem. */
182 /*! \brief The subset of supported modems allowed at the current time, allowing for negotiation. */
184 /*! \brief True if a carrier is present. Otherwise false. */
186 /*! \brief True if a modem has trained correctly. */
188 /*! \brief True if a valid HDLC frame has been received in the current reception period. */
190
191 /*! \brief Current reception mode. */
193 /*! \brief Current transmission mode. */
195
196 /*! \brief T0 is the answer timeout when calling another FAX machine.
197 Placing calls is handled outside the FAX processing, but this timeout keeps
198 running until V.21 modulation is sent or received.
199 T1 is the remote terminal identification timeout (in audio samples). */
201 /*! \brief T2, T2A and T2B are the HDLC command timeouts.
202 T4, T4A and T4B are the HDLC response timeouts (in audio samples). */
204 /*! \brief A value specifying which of the possible timers is currently running in timer_t2_t4 */
206 /*! \brief Procedural interrupt timeout (in audio samples). */
208 /*! \brief This is only used in error correcting mode. */
210 /*! \brief This is only used in full duplex (e.g. ISDN) modes. */
212 /*! \brief This is only used in full duplex (e.g. ISDN) modes. */
214 /*! \brief This is only used in full duplex (e.g. ISDN) modes. */
216
217 /*! \brief True once the far end FAX entity has been detected. */
219
220 /*! \brief True once the end of procedure condition has been detected. */
222
223 /*! \brief True if a local T.30 interrupt is pending. */
225 /*! \brief The image coding being used on the line. */
227 /*! \brief The image coding being used for output files. */
229 /*! \brief The current DCS message minimum scan time code. */
231 /*! \brief The X direction resolution of the current image, in pixels per metre. */
233 /*! \brief The Y direction resolution of the current image, in pixels per metre. */
235 /*! \brief The width of the current image, in pixels. */
237 /*! \brief Current number of retries of the action in progress. */
239 /*! \brief True if error correcting mode is used. */
241 /*! \brief The number of HDLC frame retries, if error correcting mode is used. */
243 /*! \brief The current count of consecutive T30_PPR messages. */
245 /*! \brief The current count of consecutive T30_RNR messages. */
247 /*! \brief The number of octets to be used per ECM frame. */
249 /*! \brief The ECM partial page buffer. */
250 uint8_t ecm_data[256][260];
251 /*! \brief The lengths of the frames in the ECM partial page buffer. */
252 int16_t ecm_len[256];
253 /*! \brief A bit map of the OK ECM frames, constructed as a PPR frame. */
254 uint8_t ecm_frame_map[3 + 32];
255
256 /*! \brief The current page number for receiving, in ECM or non-ECM mode. This is reset at the start of a call. */
258 /*! \brief The current page number for sending, in ECM or non-ECM mode. This is reset at the start of a call. */
260 /*! \brief The current block number, in ECM mode */
262 /*! \brief The number of frames in the current block number, in ECM mode */
264 /*! \brief The number of frames sent in the current burst of image transmission, in ECM mode */
266 /*! \brief The current ECM frame, during ECM transmission. */
268 /*! \brief True if we are at the end of an ECM page to se sent - i.e. there are no more
269 partial pages still to come. */
271
272 /*! \brief The last result for a received non-ECM page - T30_MPS, T30_RTP, or T30_RTN. */
274
275 /*! \brief The transmission step queued to follow the one in progress. */
277 /*! \brief The FCF for the next receive step. */
279 /*! \brief Image file name for image reception. */
280 char rx_file[256];
281 /*! \brief The last page we are prepared accept for a received image file. -1 means no restriction. */
283 /*! \brief Image file name to be sent. */
284 char tx_file[256];
285 /*! \brief The first page to be sent from the image file. -1 means no restriction. */
287 /*! \brief The last page to be sent from the image file. -1 means no restriction. */
289 /*! \brief The current completion status. */
291
292 /*! \brief the FCF2 field of the last PPS message we received. */
294 /*! \brief True if all frames of the current received ECM block are now OK */
296 /*! \brief A count of successfully received ECM frames, to assess progress as a basis for
297 deciding whether to continue error correction when PPRs keep repeating. */
299
300 /*! \brief The number of RTP events */
302 /*! \brief The number of RTN events */
304
305 /*! \brief Error and flow logging control */
307};
308
309#endif
310/*- End of file ------------------------------------------------------------*/
struct logging_state_s logging_state_t
Definition logging.h:75
Definition t30.h:474
Definition private/t30.h:36
uint8_t min_scan_time_code
The current DCS message minimum scan time code.
Definition private/t30.h:230
char tx_file[256]
Image file name to be sent.
Definition private/t30.h:284
int image_carrier_attempted
True if an image carrier appears to have been received, even if it did not successfully train.
Definition private/t30.h:170
int error_correcting_mode_retries
The number of HDLC frame retries, if error correcting mode is used.
Definition private/t30.h:242
t30_phase_e_handler_t * phase_e_handler
A pointer to a callback routine to be called when phase E events occur.
Definition private/t30.h:107
int timer_t8
This is only used in full duplex (e.g. ISDN) modes.
Definition private/t30.h:215
char header_info[T30_MAX_PAGE_HEADER_INFO+1]
The text which will be used in FAX page header. No text results in no header line.
Definition private/t30.h:71
t30_real_time_frame_handler_t * real_time_frame_handler
A pointer to a callback routine to be called when frames are exchanged.
Definition private/t30.h:112
int rx_page_number
The current page number for receiving, in ECM or non-ECM mode. This is reset at the start of a call.
Definition private/t30.h:257
t30_exchanged_info_t tx_info
The information fields to be transmitted.
Definition private/t30.h:87
int16_t ecm_len[256]
The lengths of the frames in the ECM partial page buffer.
Definition private/t30.h:252
t4_image_width_t image_width
The width of the current image, in pixels.
Definition private/t30.h:236
int retransmit_capable
True if we are capable of retransmitting pages.
Definition private/t30.h:64
int output_encoding
The image coding being used for output files.
Definition private/t30.h:228
int ecm_frames
The number of frames in the current block number, in ECM mode.
Definition private/t30.h:263
int tcf_test_bits
A count of the number of bits in the trainability test. This counts down to zero when sending TCF,...
Definition private/t30.h:174
uint8_t last_pps_fcf2
the FCF2 field of the last PPS message we received.
Definition private/t30.h:293
int ecm_allowed
True is ECM mode handling is enabled.
Definition private/t30.h:62
int current_fallback
The current fallback step for the fast message transfer modem.
Definition private/t30.h:181
int phase
The current T.30 phase.
Definition private/t30.h:142
int timer_t6
This is only used in full duplex (e.g. ISDN) modes.
Definition private/t30.h:211
void * phase_d_user_data
An opaque pointer supplied in event D callbacks.
Definition private/t30.h:104
int ecm_progress
A count of successfully received ECM frames, to assess progress as a basis for deciding whether to co...
Definition private/t30.h:298
int tx_stop_page
The last page to be sent from the image file. -1 means no restriction.
Definition private/t30.h:288
int octets_per_ecm_frame
The number of octets to be used per ECM frame.
Definition private/t30.h:248
t30_phase_b_handler_t * phase_b_handler
A pointer to a callback routine to be called when phase B events occur.
Definition private/t30.h:97
int receiver_not_ready_count
The current count of consecutive T30_RNR messages.
Definition private/t30.h:246
uint8_t ecm_frame_map[3+32]
A bit map of the OK ECM frames, constructed as a PPR frame.
Definition private/t30.h:254
t30_phase_d_handler_t * phase_d_handler
A pointer to a callback routine to be called when phase D events occur.
Definition private/t30.h:102
int timer_t2_t4
T2, T2A and T2B are the HDLC command timeouts. T4, T4A and T4B are the HDLC response timeouts (in aud...
Definition private/t30.h:203
int retries
Current number of retries of the action in progress.
Definition private/t30.h:238
t30_send_hdlc_handler_t * send_hdlc_handler
The transmitted HDLC frame handler.
Definition private/t30.h:132
int rtn_events
The number of RTN events.
Definition private/t30.h:303
uint8_t dcs_frame[T30_MAX_DIS_DTC_DCS_LEN]
The preparation buffer for the DCS message to be transmitted.
Definition private/t30.h:151
int ecm_frames_this_tx_burst
The number of frames sent in the current burst of image transmission, in ECM mode.
Definition private/t30.h:265
int end_of_procedure_detected
True once the end of procedure condition has been detected.
Definition private/t30.h:221
int x_resolution
The X direction resolution of the current image, in pixels per metre.
Definition private/t30.h:232
int current_status
The current completion status.
Definition private/t30.h:290
tz_t tz
Optional per instance time zone for the FAX page header timestamp.
Definition private/t30.h:79
int short_train
True if the short training sequence should be used.
Definition private/t30.h:166
int supported_modems
A bit mask of the currently supported modem types.
Definition private/t30.h:52
const char * country
The country of origin of the remote machine, if known, else NULL.
Definition private/t30.h:89
int iaf
Internet aware FAX mode bit mask.
Definition private/t30.h:50
int last_rx_page_result
The last result for a received non-ECM page - T30_MPS, T30_RTP, or T30_RTN.
Definition private/t30.h:273
int use_own_tz
Use private timezone if true.
Definition private/t30.h:77
int rx_signal_present
True if a carrier is present. Otherwise false.
Definition private/t30.h:185
int line_encoding
The image coding being used on the line.
Definition private/t30.h:226
int timer_t7
This is only used in full duplex (e.g. ISDN) modes.
Definition private/t30.h:213
int next_phase
The T.30 phase to change to when the current phase ends.
Definition private/t30.h:144
int ecm_at_page_end
True if we are at the end of an ECM page to se sent - i.e. there are no more partial pages still to c...
Definition private/t30.h:270
int rx_trained
True if a modem has trained correctly.
Definition private/t30.h:187
int timer_t0_t1
T0 is the answer timeout when calling another FAX machine. Placing calls is handled outside the FAX p...
Definition private/t30.h:200
int timer_t5
This is only used in error correcting mode.
Definition private/t30.h:209
void * real_time_frame_user_data
An opaque pointer supplied in real time frame callbacks.
Definition private/t30.h:114
int supported_t30_features
A bit mask of the currently supported T.30 special features.
Definition private/t30.h:60
int rx_frame_received
True if a valid HDLC frame has been received in the current reception period.
Definition private/t30.h:189
int timer_t3
Procedural interrupt timeout (in audio samples).
Definition private/t30.h:207
int supported_resolutions
A bit mask of the currently supported image resolutions.
Definition private/t30.h:56
t30_exchanged_info_t rx_info
The information fields received.
Definition private/t30.h:85
int tx_page_number
The current page number for sending, in ECM or non-ECM mode. This is reset at the start of a call.
Definition private/t30.h:259
logging_state_t logging
Error and flow logging control.
Definition private/t30.h:306
uint8_t far_dis_dtc_frame[T30_MAX_DIS_DTC_DCS_LEN]
The last DIS or DTC message received form the far end.
Definition private/t30.h:159
int header_overlays_image
True for FAX page headers to overlay (i.e. replace) the beginning of the page image....
Definition private/t30.h:75
void * document_user_data
An opaque pointer supplied in document callbacks.
Definition private/t30.h:120
int ppr_count
The current count of consecutive T30_PPR messages.
Definition private/t30.h:244
int local_interrupt_pending
True if a local T.30 interrupt is pending.
Definition private/t30.h:224
void * phase_b_user_data
An opaque pointer supplied in event B callbacks.
Definition private/t30.h:99
char rx_file[256]
Image file name for image reception.
Definition private/t30.h:280
int current_rx_type
Current reception mode.
Definition private/t30.h:192
void * set_tx_type_user_data
An opaque pointer passed to the handler for changes to the transmit mode.
Definition private/t30.h:129
int rtp_events
The number of RTP events.
Definition private/t30.h:301
int far_end_detected
True once the far end FAX entity has been detected.
Definition private/t30.h:218
t30_document_handler_t * document_handler
A pointer to a callback routine to be called when document events (e.g. end of transmitted document) ...
Definition private/t30.h:118
int timer_t2_t4_is
A value specifying which of the possible timers is currently running in timer_t2_t4.
Definition private/t30.h:205
int current_tx_type
Current transmission mode.
Definition private/t30.h:194
uint8_t ecm_data[256][260]
The ECM partial page buffer.
Definition private/t30.h:250
char rx_dcs_string[T30_MAX_DIS_DTC_DCS_LEN *3+1]
The received DCS, formatted as an ASCII string, for inclusion in the TIFF file.
Definition private/t30.h:68
int rx_stop_page
The last page we are prepared accept for a received image file. -1 means no restriction.
Definition private/t30.h:282
int next_tx_step
The transmission step queued to follow the one in progress.
Definition private/t30.h:276
uint8_t local_min_scan_time_code
The DIS code for the minimum scan row time we require. This is usually 0ms, but if we are trying to s...
Definition private/t30.h:139
t30_set_handler_t * set_rx_type_handler
The handler for changes to the receive mode.
Definition private/t30.h:123
int error_correcting_mode
True if error correcting mode is used.
Definition private/t30.h:240
int supported_compressions
A bit mask of the currently supported image compression modes.
Definition private/t30.h:54
int dis_received
True if a valid DIS has been received from the far end.
Definition private/t30.h:163
int ecm_block
The current block number, in ECM mode.
Definition private/t30.h:261
int operation_in_progress
The type of FAX operation currently in progress.
Definition private/t30.h:44
int rx_ecm_block_ok
True if all frames of the current received ECM block are now OK.
Definition private/t30.h:295
union t30_state_s::@016001336260065013143013144073222175341214271106 t4
T.4 context for reading or writing image data.
int local_dis_dtc_len
The length of the DIS or DTC message to be transmitted.
Definition private/t30.h:157
int far_dis_dtc_len
The length of the last DIS or DTC message received form the far end.
Definition private/t30.h:161
int supported_image_sizes
A bit mask of the currently supported image sizes.
Definition private/t30.h:58
int calling_party
True if behaving as the calling party.
Definition private/t30.h:47
int step
The step in sending a sequence of HDLC frames.
Definition private/t30.h:148
void * send_hdlc_user_data
An opaque pointer passed to the transmitted HDLC frame handler.
Definition private/t30.h:134
uint8_t next_rx_step
The FCF for the next receive step.
Definition private/t30.h:278
int remote_interrupts_allowed
True if remote T.30 procedural interrupts are allowed.
Definition private/t30.h:82
void * set_rx_type_user_data
An opaque pointer passed to the handler for changes to the receive mode.
Definition private/t30.h:125
int ecm_current_tx_frame
The current ECM frame, during ECM transmission.
Definition private/t30.h:267
const char * model
The model of the remote machine, if known, else NULL.
Definition private/t30.h:93
int y_resolution
The Y direction resolution of the current image, in pixels per metre.
Definition private/t30.h:234
int tcf_most_zeros
The maximum consecutive received zero bits seen to date, during the trainability test.
Definition private/t30.h:178
t30_set_handler_t * set_tx_type_handler
The handler for changes to the transmit mode.
Definition private/t30.h:127
uint8_t local_dis_dtc_frame[T30_MAX_DIS_DTC_DCS_LEN]
The preparation buffer for DIS or DTC message to be transmitted.
Definition private/t30.h:155
int state
The current state of the T.30 state machine.
Definition private/t30.h:146
void * phase_e_user_data
An opaque pointer supplied in event E callbacks.
Definition private/t30.h:109
int dcs_len
The length of the DCS message to be transmitted.
Definition private/t30.h:153
const char * vendor
The vendor of the remote machine, if known, else NULL.
Definition private/t30.h:91
int current_permitted_modems
The subset of supported modems allowed at the current time, allowing for negotiation.
Definition private/t30.h:183
int tcf_current_zeros
The current count of consecutive received zero bits, during the trainability test.
Definition private/t30.h:176
int tx_start_page
The first page to be sent from the image file. -1 means no restriction.
Definition private/t30.h:286
void t30_phase_e_handler_t(t30_state_t *s, void *user_data, int completion_code)
T.30 phase E callback handler.
Definition t30.h:180
#define T30_MAX_PAGE_HEADER_INFO
Definition t30.h:146
#define T30_MAX_DIS_DTC_DCS_LEN
Definition t30.h:142
int t30_phase_d_handler_t(t30_state_t *s, void *user_data, int result)
T.30 phase D callback handler.
Definition t30.h:171
void t30_real_time_frame_handler_t(t30_state_t *s, void *user_data, int direction, const uint8_t msg[], int len)
T.30 real time frame handler.
Definition t30.h:191
void t30_set_handler_t(void *user_data, int type, int bit_rate, int short_train, int use_hdlc)
T.30 set a receive or transmit type handler.
Definition t30.h:215
void t30_send_hdlc_handler_t(void *user_data, const uint8_t msg[], int len)
T.30 send HDLC handler.
Definition t30.h:224
int t30_document_handler_t(t30_state_t *s, void *user_data, int status)
T.30 document handler.
Definition t30.h:204
int t30_phase_b_handler_t(t30_state_t *s, void *user_data, int result)
T.30 phase B callback handler.
Definition t30.h:161
t4_image_width_t
Definition t4_rx.h:125