spandsp
0.0.6
Main Page
Related Pages
Classes
Files
File List
File Members
private/t38_non_ecm_buffer.h
1
/*
2
* SpanDSP - a series of DSP components for telephony
3
*
4
* private/t38_non_ecm_buffer.h - A rate adapting buffer for T.38 non-ECM image
5
* and TCF data
6
*
7
* Written by Steve Underwood <steveu@coppice.org>
8
*
9
* Copyright (C) 2005, 2006, 2007, 2008 Steve Underwood
10
*
11
* All rights reserved.
12
*
13
* This program is free software; you can redistribute it and/or modify
14
* it under the terms of the GNU Lesser General Public License version 2.1,
15
* as published by the Free Software Foundation.
16
*
17
* This program is distributed in the hope that it will be useful,
18
* but WITHOUT ANY WARRANTY; without even the implied warranty of
19
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20
* GNU Lesser General Public License for more details.
21
*
22
* You should have received a copy of the GNU Lesser General Public
23
* License along with this program; if not, write to the Free Software
24
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25
*/
26
27
#if !defined(_SPANDSP_PRIVATE_T38_NON_ECM_BUFFER_H_)
28
#define _SPANDSP_PRIVATE_T38_NON_ECM_BUFFER_H_
29
30
/*! \brief A flow controlled non-ECM image data buffer, for buffering T.38 to analogue
31
modem data.
32
*/
33
struct
t38_non_ecm_buffer_state_s
34
{
35
/*! \brief Minimum number of bits per row, used when fill bits are being deleted on the
36
link, and restored at the emitting gateway. */
37
int
min_bits_per_row
;
38
39
/*! \brief non-ECM modem transmit data buffer. */
40
uint8_t
data
[
T38_NON_ECM_TX_BUF_LEN
];
41
/*! \brief The current write point in the buffer. */
42
int
in_ptr
;
43
/*! \brief The current read point in the buffer. */
44
int
out_ptr
;
45
/*! \brief The location of the most recent EOL marker in the buffer. */
46
int
latest_eol_ptr
;
47
/*! \brief The number of bits to date in the current row, used when min_row_bits is
48
to be applied. */
49
int
row_bits
;
50
51
/*! \brief The bit stream entering the buffer, used to detect EOLs */
52
unsigned
int
bit_stream
;
53
/*! \brief The non-ECM flow control fill octet (0xFF before the first data, and 0x00
54
once data has started). */
55
uint8_t
flow_control_fill_octet
;
56
/*! \brief A code for the phase of input buffering, from initial all ones to completion. */
57
int
input_phase
;
58
/*! \brief TRUE is the end of non-ECM data indication has been received. */
59
int
data_finished
;
60
/*! \brief The current octet being transmitted from the buffer. */
61
unsigned
int
octet
;
62
/*! \brief The current bit number in the current non-ECM octet. */
63
int
bit_no
;
64
/*! \brief TRUE if in image data mode, as opposed to TCF mode. */
65
int
image_data_mode
;
66
67
/*! \brief The number of octets input to the buffer. */
68
int
in_octets
;
69
/*! \brief The number of rows input to the buffer. */
70
int
in_rows
;
71
/*! \brief The number of non-ECM fill octets generated for minimum row bits
72
purposes. */
73
int
min_row_bits_fill_octets
;
74
/*! \brief The number of octets output from the buffer. */
75
int
out_octets
;
76
/*! \brief The number of rows output from the buffer. */
77
int
out_rows
;
78
/*! \brief The number of non-ECM fill octets generated for flow control
79
purposes. */
80
int
flow_control_fill_octets
;
81
};
82
83
#endif
84
/*- End of file ------------------------------------------------------------*/
src
spandsp
private
t38_non_ecm_buffer.h
Generated on Wed Oct 16 2013 09:59:53 for spandsp by
1.8.4