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5
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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 * t4_tests.c - ITU T.4 FAX image to and from TIFF file tests
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5 *
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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 General Public License version 2, as
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14 * 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
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19 * GNU 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 General Public License
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22 * 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_tests.c,v 1.34 2006/11/23 15:48:09 steveu Exp $
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26 */
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27
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28 /*! \file */
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29
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30 /*! \page t4_tests_page T.4 tests
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31 \section t4_tests_page_sec_1 What does it do
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32 These tests exercise the image compression and decompression methods defined
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33 in ITU specifications T.4 and T.6.
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34 */
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35
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36 #ifdef HAVE_CONFIG_H
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37 #include "config.h"
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38 #endif
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39
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40 #include <stdio.h>
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41 #include <stdlib.h>
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42 #include <inttypes.h>
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43 #include <fcntl.h>
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44 #include <memory.h>
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45 #if defined(HAVE_TGMATH_H)
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46 #include <tgmath.h>
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47 #endif
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48 #if defined(HAVE_MATH_H)
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49 #include <math.h>
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50 #endif
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51
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52 #include <tiffio.h>
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53
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54 #include "spandsp.h"
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55
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56 #define IN_FILE_NAME "../itutests/fax/itutests.tif"
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57 #define OUT_FILE_NAME "t4_tests_receive.tif"
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58
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59 #define XSIZE 1728
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60
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61 t4_state_t send_state;
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62 t4_state_t receive_state;
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63
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64 int main(int argc, char* argv[])
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65 {
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66 int sends;
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67 int page_no;
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68 int bit;
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69 int end_of_page;
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70 int end_marks;
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71 int i;
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72 int decode_test;
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73 int compression;
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74 int compression_step;
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75 int add_page_headers;
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76 int min_row_bits;
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77 int restart_pages;
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78 char buf[512];
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79 t4_stats_t stats;
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80 const char *in_file_name;
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81
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82 i = 1;
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83 decode_test = FALSE;
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84 compression = -1;
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85 add_page_headers = FALSE;
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86 restart_pages = FALSE;
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87 in_file_name = IN_FILE_NAME;
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88 min_row_bits = 0;
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89 while (i < argc)
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90 {
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91 if (strcmp(argv[i], "-d") == 0)
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92 decode_test = TRUE;
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93 else if (strcmp(argv[i], "-1") == 0)
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94 compression = T4_COMPRESSION_ITU_T4_1D;
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95 else if (strcmp(argv[i], "-2") == 0)
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96 compression = T4_COMPRESSION_ITU_T4_2D;
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97 else if (strcmp(argv[i], "-6") == 0)
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98 compression = T4_COMPRESSION_ITU_T6;
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99 else if (strcmp(argv[i], "-h") == 0)
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100 add_page_headers = TRUE;
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101 else if (strcmp(argv[i], "-r") == 0)
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102 restart_pages = TRUE;
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103 else if (strcmp(argv[i], "-i") == 0)
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104 in_file_name = argv[++i];
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105 else if (strcmp(argv[i], "-m") == 0)
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106 min_row_bits = atoi(argv[++i]);
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107 i++;
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108 }
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109 /* Create a send and a receive end */
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110 memset(&send_state, 0, sizeof(send_state));
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111 memset(&receive_state, 0, sizeof(receive_state));
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112
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113 if (decode_test)
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114 {
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115 if (compression < 0)
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116 compression = T4_COMPRESSION_ITU_T4_1D;
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117 /* Receive end puts TIFF to a new file. We assume the receive width here. */
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118 if (t4_rx_init(&receive_state, OUT_FILE_NAME, T4_COMPRESSION_ITU_T4_2D))
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119 {
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120 printf("Failed to init\n");
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121 exit(2);
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122 }
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123
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124 t4_rx_set_rx_encoding(&receive_state, compression);
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125 t4_rx_set_x_resolution(&receive_state, T4_X_RESOLUTION_R8);
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126 t4_rx_set_y_resolution(&receive_state, T4_Y_RESOLUTION_FINE);
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127 t4_rx_set_image_width(&receive_state, XSIZE);
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128
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129 page_no = 1;
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130 t4_rx_start_page(&receive_state);
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131 while (fgets(buf, 511, stdin))
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132 {
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133 if (sscanf(buf, "Rx bit %*d - %d", &bit) == 1)
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134 {
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135 if ((end_of_page = t4_rx_put_bit(&receive_state, bit)))
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136 {
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137 printf("End of page detected\n");
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138 break;
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139 }
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140 }
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141 }
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142 #if 0
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143 /* Dump the entire image as text 'X's and spaces */
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144 s = receive_state.image_buffer;
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145 for (i = 0; i < receive_state.rows; i++)
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146 {
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147 for (j = 0; j < receive_state.bytes_per_row; j++)
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148 {
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149 for (k = 0; k < 8; k++)
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150 {
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151 printf((receive_state.image_buffer[i*receive_state.bytes_per_row + j] & (0x80 >> k)) ? "X" : " ");
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152 }
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153 }
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154 printf("\n");
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155 }
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156 #endif
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157 t4_rx_end_page(&receive_state);
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158 t4_get_transfer_statistics(&receive_state, &stats);
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159 printf("Pages = %d\n", stats.pages_transferred);
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160 printf("Image size = %d x %d\n", stats.width, stats.length);
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161 printf("Image resolution = %d x %d\n", stats.x_resolution, stats.y_resolution);
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162 printf("Bad rows = %d\n", stats.bad_rows);
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163 printf("Longest bad row run = %d\n", stats.longest_bad_row_run);
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164 t4_rx_end(&receive_state);
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165 }
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166 else
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167 {
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168 /* Send end gets TIFF from a file */
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169 if (t4_tx_init(&send_state, in_file_name, -1, -1))
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170 {
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171 printf("Failed to init TIFF send\n");
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172 exit(2);
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173 }
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174
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175 /* Receive end puts TIFF to a new file. */
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176 if (t4_rx_init(&receive_state, OUT_FILE_NAME, T4_COMPRESSION_ITU_T4_2D))
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177 {
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178 printf("Failed to init\n");
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179 exit(2);
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180 }
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181
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182 t4_tx_set_min_row_bits(&send_state, min_row_bits);
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183
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184 t4_rx_set_x_resolution(&receive_state, t4_tx_get_x_resolution(&send_state));
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185 t4_rx_set_y_resolution(&receive_state, t4_tx_get_y_resolution(&send_state));
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186 t4_rx_set_image_width(&receive_state, t4_tx_get_image_width(&send_state));
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187
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188 /* Now send and receive all the pages in the source TIFF file */
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189 page_no = 1;
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190 t4_tx_set_local_ident(&send_state, "852 2666 0542");
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191 sends = 0;
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192 /* Select whether we step round the compression schemes, or use a single specified one. */
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193 compression_step = (compression < 0) ? 0 : -1;
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194 for (;;)
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195 {
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196 end_marks = 0;
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197 /* Add a header line to alternate pages, if required */
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198 if (add_page_headers && (sends & 2))
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199 t4_tx_set_header_info(&send_state, "Header");
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200 else
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201 t4_tx_set_header_info(&send_state, NULL);
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202 if (restart_pages && (sends & 1))
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203 {
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204 /* Use restart, to send the page a second time */
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205 if (t4_tx_restart_page(&send_state))
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206 break;
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207 }
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208 else
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209 {
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210 switch (compression_step)
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211 {
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212 case 0:
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213 compression = T4_COMPRESSION_ITU_T4_1D;
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214 compression_step++;
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215 break;
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216 case 1:
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217 compression = T4_COMPRESSION_ITU_T4_2D;
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218 compression_step++;
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219 break;
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220 case 2:
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221 compression = T4_COMPRESSION_ITU_T6;
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222 compression_step = 0;
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223 break;
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224 }
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225 t4_tx_set_tx_encoding(&send_state, compression);
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226 t4_rx_set_rx_encoding(&receive_state, compression);
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227
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228 if (t4_tx_start_page(&send_state))
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229 break;
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230 }
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231 t4_rx_start_page(&receive_state);
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232 do
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233 {
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234 bit = t4_tx_get_bit(&send_state);
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235 #if 0
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236 if (--next_hit <= 0)
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237 {
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238 do
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239 next_hit = rand() & 0x3FF;
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240 while (next_hit < 20);
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241 bit ^= (rand() & 1);
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242 }
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243 #endif
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244 if (bit == PUTBIT_END_OF_DATA)
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245 {
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246 /* T.6 data does not contain an image termination sequence.
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247 T.4 1D and 2D do, and should locate that sequence. */
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248 if (compression == T4_COMPRESSION_ITU_T6)
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249 break;
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250 if (++end_marks > 50)
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251 {
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252 printf("Receiver missed the end of page mark\n");
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253 exit(2);
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254 }
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255 }
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256 end_of_page = t4_rx_put_bit(&receive_state, bit & 1);
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257 }
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258 while (!end_of_page);
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259 t4_get_transfer_statistics(&receive_state, &stats);
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260 printf("Pages = %d\n", stats.pages_transferred);
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261 printf("Image size = %d x %d\n", stats.width, stats.length);
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262 printf("Image resolution = %d x %d\n", stats.x_resolution, stats.y_resolution);
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263 printf("Bad rows = %d\n", stats.bad_rows);
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264 printf("Longest bad row run = %d\n", stats.longest_bad_row_run);
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265 if (!restart_pages || (sends & 1))
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266 t4_tx_end_page(&send_state);
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267 t4_rx_end_page(&receive_state);
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268 sends++;
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269 }
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270 /* And we should now have a matching received TIFF file. Note this will only match
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271 at the image level. TIFF files allow a lot of ways to express the same thing,
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272 so bit matching of the files is not the normal case. */
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273 t4_tx_end(&send_state);
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274 t4_rx_end(&receive_state);
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275 }
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276 }
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277 /*- End of function --------------------------------------------------------*/
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278 /*- End of file ------------------------------------------------------------*/
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