Mercurial > hg > audiostuff
annotate spandsp-0.0.6pre17/src/spandsp/private/t4_rx.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 |
parents | 26cd8f1ef0b1 |
children |
rev | line source |
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26cd8f1ef0b1
import spandsp-0.0.6pre17
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1 /* |
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2 * SpanDSP - a series of DSP components for telephony |
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3 * |
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4 * private/t4_rx.h - definitions for T.4 FAX receive processing |
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5 * |
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import spandsp-0.0.6pre17
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6 * Written by Steve Underwood <steveu@coppice.org> |
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7 * |
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8 * Copyright (C) 2003 Steve Underwood |
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9 * |
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10 * All rights reserved. |
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11 * |
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12 * This program is free software; you can redistribute it and/or modify |
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13 * it under the terms of the GNU Lesser General Public License version 2.1, |
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14 * as published by the Free Software Foundation. |
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15 * |
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16 * This program is distributed in the hope that it will be useful, |
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17 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
26cd8f1ef0b1
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19 * GNU Lesser General Public License for more details. |
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20 * |
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21 * You should have received a copy of the GNU Lesser General Public |
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22 * License along with this program; if not, write to the Free Software |
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23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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24 * |
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25 * $Id: t4_rx.h,v 1.6.2.8 2009/12/21 17:18:40 steveu Exp $ |
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26 */ |
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27 |
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28 #if !defined(_SPANDSP_PRIVATE_T4_RX_H_) |
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29 #define _SPANDSP_PRIVATE_T4_RX_H_ |
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30 |
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31 /*! |
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32 TIFF specific state information to go with T.4 compression or decompression handling. |
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33 */ |
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34 typedef struct |
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35 { |
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36 /*! \brief The current file name. */ |
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37 const char *file; |
26cd8f1ef0b1
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38 /*! \brief The libtiff context for the current TIFF file */ |
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39 TIFF *tiff_file; |
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40 |
26cd8f1ef0b1
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41 /*! \brief The number of pages in the current image file. */ |
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42 int pages_in_file; |
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43 |
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44 /*! \brief The compression type for output to the TIFF file. */ |
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45 int32_t output_compression; |
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46 /*! \brief The TIFF photometric setting for the current page. */ |
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47 uint16_t photo_metric; |
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48 /*! \brief The TIFF fill order setting for the current page. */ |
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49 uint16_t fill_order; |
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50 /*! \brief The TIFF G3 FAX options. */ |
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51 int32_t output_t4_options; |
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52 |
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53 /* "Background" information about the FAX, which can be stored in the image file. */ |
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54 /*! \brief The vendor of the machine which produced the file. */ |
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55 const char *vendor; |
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56 /*! \brief The model of machine which produced the file. */ |
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57 const char *model; |
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58 /*! \brief The local ident string. */ |
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59 const char *local_ident; |
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60 /*! \brief The remote end's ident string. */ |
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61 const char *far_ident; |
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62 /*! \brief The FAX sub-address. */ |
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63 const char *sub_address; |
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64 /*! \brief The FAX DCS information, as an ASCII string. */ |
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65 const char *dcs; |
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66 |
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67 /*! \brief The first page to transfer. -1 to start at the beginning of the file. */ |
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68 int start_page; |
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69 /*! \brief The last page to transfer. -1 to continue to the end of the file. */ |
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70 int stop_page; |
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71 } t4_tiff_state_t; |
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72 |
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73 typedef struct t4_t6_decode_state_s t4_t6_decode_state_t; |
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74 |
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75 /*! |
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76 T.4 1D, T4 2D and T6 decompressor state. |
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77 */ |
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78 struct t4_t6_decode_state_s |
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79 { |
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80 /*! \brief Callback function to write a row of pixels to the image destination. */ |
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81 t4_row_write_handler_t row_write_handler; |
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82 /*! \brief Opaque pointer passed to row_write_handler. */ |
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83 void *row_write_user_data; |
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84 |
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85 /*! \brief Incoming bit buffer for decompression. */ |
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86 uint32_t rx_bitstream; |
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87 /*! \brief The number of bits currently in rx_bitstream. */ |
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88 int rx_bits; |
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89 /*! \brief The number of bits to be skipped before trying to match the next code word. */ |
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90 int rx_skip_bits; |
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91 |
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92 /*! \brief This variable is used to count the consecutive EOLS we have seen. If it |
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93 reaches six, this is the end of the image. It is initially set to -1 for |
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94 1D and 2D decoding, as an indicator that we must wait for the first EOL, |
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95 before decoding any image data. */ |
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96 int consecutive_eols; |
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97 |
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98 /*! \brief The reference or starting changing element on the coding line. At the |
26cd8f1ef0b1
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99 start of the coding line, a0 is set on an imaginary white changing element |
26cd8f1ef0b1
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100 situated just before the first element on the line. During the coding of |
26cd8f1ef0b1
import spandsp-0.0.6pre17
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101 the coding line, the position of a0 is defined by the previous coding mode. |
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102 (See T.4/4.2.1.3.2.). */ |
26cd8f1ef0b1
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103 int a0; |
26cd8f1ef0b1
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104 /*! \brief The first changing element on the reference line to the right of a0 and of |
26cd8f1ef0b1
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parents:
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105 opposite colour to a0. */ |
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106 int b1; |
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107 /*! \brief The length of the in-progress run of black or white. */ |
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Peter Meerwald <pmeerw@cosy.sbg.ac.at>
parents:
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108 int run_length; |
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import spandsp-0.0.6pre17
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109 /*! \brief 2D horizontal mode control. */ |
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import spandsp-0.0.6pre17
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110 int black_white; |
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import spandsp-0.0.6pre17
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111 /*! \brief TRUE if the current run is black */ |
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import spandsp-0.0.6pre17
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112 int its_black; |
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import spandsp-0.0.6pre17
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113 |
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import spandsp-0.0.6pre17
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114 /*! \brief The current step into the current row run-lengths buffer. */ |
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import spandsp-0.0.6pre17
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115 int a_cursor; |
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import spandsp-0.0.6pre17
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116 /*! \brief The current step into the reference row run-lengths buffer. */ |
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import spandsp-0.0.6pre17
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117 int b_cursor; |
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import spandsp-0.0.6pre17
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118 |
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import spandsp-0.0.6pre17
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119 /*! \brief A pointer into the image buffer indicating where the last row begins */ |
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import spandsp-0.0.6pre17
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120 int last_row_starts_at; |
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import spandsp-0.0.6pre17
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121 |
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import spandsp-0.0.6pre17
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122 /*! \brief The current number of consecutive bad rows. */ |
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import spandsp-0.0.6pre17
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123 int curr_bad_row_run; |
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import spandsp-0.0.6pre17
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124 /*! \brief The longest run of consecutive bad rows seen in the current page. */ |
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import spandsp-0.0.6pre17
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125 int longest_bad_row_run; |
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import spandsp-0.0.6pre17
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126 /*! \brief The total number of bad rows in the current page. */ |
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import spandsp-0.0.6pre17
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127 int bad_rows; |
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import spandsp-0.0.6pre17
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128 }; |
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import spandsp-0.0.6pre17
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129 |
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import spandsp-0.0.6pre17
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130 #endif |
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import spandsp-0.0.6pre17
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131 /*- End of file ------------------------------------------------------------*/ |