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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 * v27ter_tests.c
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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: v27ter_tests.c,v 1.70 2006/11/19 14:07:27 steveu Exp $
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26 */
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27
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28 /*! \page v27ter_tests_page V.27ter modem tests
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29 \section v27ter_tests_page_sec_1 What does it do?
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30 These tests test one way paths, as V.27ter is a half-duplex modem. They allow either:
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31
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32 - A V.27ter transmit modem to feed a V.27ter receive modem through a telephone line
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33 model. BER testing is then used to evaluate performance under various line
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34 conditions. This is effective for testing the basic performance of the
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35 receive modem. It is also the only test mode provided for evaluating the
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36 transmit modem.
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37
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38 - A V.27ter receive modem is used to decode V.27ter audio, stored in a wave file.
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39 This is good way to evaluate performance with audio recorded from other
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40 models of modem, and with real world problematic telephone lines.
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41
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42 If the appropriate GUI environment exists, the tests are built such that a visual
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43 display of modem status is maintained.
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44
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45 \section v27ter_tests_page_sec_2 How is it used?
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46 */
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47
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48 #ifdef HAVE_CONFIG_H
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49 #include "config.h"
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50 #endif
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51
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52 #if defined(HAVE_FL_FL_H) && defined(HAVE_FL_FL_CARTESIAN_H) && defined(HAVE_FL_FL_AUDIO_METER_H)
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53 #define ENABLE_GUI
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54 #endif
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55
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56 #include <inttypes.h>
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57 #include <stdlib.h>
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58 #include <stdio.h>
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59 #include <fcntl.h>
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60 #include <string.h>
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61 #if defined(HAVE_TGMATH_H)
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62 #include <tgmath.h>
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63 #endif
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64 #if defined(HAVE_MATH_H)
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65 #include <math.h>
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66 #endif
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67 #include <assert.h>
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68 #include <audiofile.h>
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69 #include <tiffio.h>
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70
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71 #include "spandsp.h"
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72 #include "test_utils.h"
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73 #include "line_model.h"
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74 #if defined(ENABLE_GUI)
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75 #include "modem_monitor.h"
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76 #include "line_model_monitor.h"
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77 #endif
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78
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79 #define BLOCK_LEN 160
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80
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81 #define OUT_FILE_NAME "v27ter.wav"
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82
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83 char *decode_test_file = NULL;
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84 int use_gui = FALSE;
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85
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86 int symbol_no = 0;
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87
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88 int rx_bits = 0;
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89
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90 bert_state_t bert;
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91 one_way_line_model_state_t *line_model;
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92
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93 #if defined(ENABLE_GUI)
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94 qam_monitor_t *qam_monitor;
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95 #endif
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96
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97 bert_results_t latest_results;
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98
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99 static void reporter(void *user_data, int reason, bert_results_t *results)
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100 {
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101 switch (reason)
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102 {
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103 case BERT_REPORT_SYNCED:
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104 printf("BERT report synced\n");
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105 break;
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106 case BERT_REPORT_UNSYNCED:
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107 printf("BERT report unsync'ed\n");
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108 break;
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109 case BERT_REPORT_REGULAR:
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110 printf("BERT report regular - %d bits, %d bad bits, %d resyncs\n", results->total_bits, results->bad_bits, results->resyncs);
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111 memcpy(&latest_results, results, sizeof(latest_results));
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112 break;
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113 case BERT_REPORT_GT_10_2:
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114 printf("BERT report > 1 in 10^2\n");
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115 break;
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116 case BERT_REPORT_LT_10_2:
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117 printf("BERT report < 1 in 10^2\n");
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118 break;
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119 case BERT_REPORT_LT_10_3:
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120 printf("BERT report < 1 in 10^3\n");
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121 break;
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122 case BERT_REPORT_LT_10_4:
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123 printf("BERT report < 1 in 10^4\n");
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124 break;
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125 case BERT_REPORT_LT_10_5:
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126 printf("BERT report < 1 in 10^5\n");
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127 break;
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128 case BERT_REPORT_LT_10_6:
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129 printf("BERT report < 1 in 10^6\n");
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130 break;
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131 case BERT_REPORT_LT_10_7:
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132 printf("BERT report < 1 in 10^7\n");
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133 break;
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134 default:
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135 printf("BERT report reason %d\n", reason);
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136 break;
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137 }
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138 }
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139 /*- End of function --------------------------------------------------------*/
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140
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141 static void v27terputbit(void *user_data, int bit)
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142 {
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143 if (bit < 0)
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144 {
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145 /* Special conditions */
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146 switch (bit)
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147 {
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148 case PUTBIT_TRAINING_FAILED:
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149 printf("Training failed\n");
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150 break;
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151 case PUTBIT_TRAINING_SUCCEEDED:
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152 printf("Training succeeded\n");
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153 break;
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154 case PUTBIT_CARRIER_UP:
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155 printf("Carrier up\n");
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156 break;
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157 case PUTBIT_CARRIER_DOWN:
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158 printf("Carrier down\n");
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159 break;
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160 default:
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161 printf("Eh!\n");
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162 break;
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163 }
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164 return;
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165 }
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166 if (decode_test_file)
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167 printf("Rx bit %d - %d\n", rx_bits++, bit);
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168 else
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169 bert_put_bit(&bert, bit);
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170 }
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171 /*- End of function --------------------------------------------------------*/
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172
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173 static int v27tergetbit(void *user_data)
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174 {
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175 return bert_get_bit(&bert);
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176 }
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177 /*- End of function --------------------------------------------------------*/
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178
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179 static void qam_report(void *user_data, const complexf_t *constel, const complexf_t *target, int symbol)
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180 {
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181 int i;
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182 int len;
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183 complexf_t *coeffs;
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184 float fpower;
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185 float error;
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186 v27ter_rx_state_t *rx;
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187 static float smooth_power = 0.0;
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188 #if defined(ENABLE_GUI)
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189 static int reports = 0;
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190 #endif
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191
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192 rx = (v27ter_rx_state_t *) user_data;
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193 if (constel)
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194 {
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195 fpower = (constel->re - target->re)*(constel->re - target->re)
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196 + (constel->im - target->im)*(constel->im - target->im);
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197 smooth_power = 0.95*smooth_power + 0.05*fpower;
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198 #if defined(ENABLE_GUI)
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199 if (use_gui)
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200 {
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201 qam_monitor_update_constel(qam_monitor, constel);
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202 qam_monitor_update_carrier_tracking(qam_monitor, v27ter_rx_carrier_frequency(rx));
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203 qam_monitor_update_symbol_tracking(qam_monitor, v27ter_rx_symbol_timing_correction(rx));
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204 }
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205 #endif
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206 error = constel->im*target->re - constel->re*target->im;
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207 printf("Tracking error %f %f %f %f %f %f\n", error, v27ter_rx_carrier_frequency(rx), constel->re, constel->im, target->re, target->im);
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208 printf("%8d [%8.4f, %8.4f] [%8.4f, %8.4f] %8.4f %8.4f %9.4f %7.3f\n",
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209 symbol_no,
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210 constel->re,
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211 constel->im,
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212 target->re,
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213 target->im,
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214 fpower,
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215 smooth_power,
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216 v27ter_rx_carrier_frequency(rx),
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217 v27ter_rx_signal_power(rx));
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218 len = v27ter_rx_equalizer_state(rx, &coeffs);
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219 printf("Equalizer B:\n");
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220 for (i = 0; i < len; i++)
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221 printf("%3d (%15.5f, %15.5f) -> %15.5f\n", i, coeffs[i].re, coeffs[i].im, powerf(&coeffs[i]));
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222 printf("Gardtest %d %f %d\n", symbol_no, v27ter_rx_symbol_timing_correction(rx), rx->gardner_integrate);
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223 printf("Carcar %d %f\n", symbol_no, v27ter_rx_carrier_frequency(rx));
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224 #if defined(ENABLE_GUI)
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225 if (use_gui)
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226 {
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227 if (++reports >= 1000)
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228 {
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229 qam_monitor_update_equalizer(qam_monitor, coeffs, len);
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230 reports = 0;
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231 }
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232 }
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233 #endif
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234 symbol_no++;
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235 }
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236 else
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237 {
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238 printf("Gardner step %d\n", symbol);
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239 len = v27ter_rx_equalizer_state(rx, &coeffs);
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240 printf("Equalizer A:\n");
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241 for (i = 0; i < len; i++)
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242 printf("%3d (%15.5f, %15.5f) -> %15.5f\n", i, coeffs[i].re, coeffs[i].im, powerf(&coeffs[i]));
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243 #if defined(ENABLE_GUI)
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244 if (use_gui)
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245 qam_monitor_update_equalizer(qam_monitor, coeffs, len);
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246 #endif
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247 }
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248 }
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249 /*- End of function --------------------------------------------------------*/
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250
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251 int main(int argc, char *argv[])
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252 {
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253 v27ter_rx_state_t rx;
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254 v27ter_tx_state_t tx;
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255 bert_results_t bert_results;
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256 int16_t gen_amp[BLOCK_LEN];
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257 int16_t amp[BLOCK_LEN];
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258 AFfilehandle inhandle;
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259 AFfilehandle outhandle;
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260 AFfilesetup filesetup;
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261 int outframes;
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262 int samples;
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263 int i;
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264 int tep;
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265 int test_bps;
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266 int noise_level;
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267 int signal_level;
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268 int bits_per_test;
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269 int line_model_no;
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270 int block;
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271 int log_audio;
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272 int channel_codec;
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273
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274 channel_codec = MUNGE_CODEC_NONE;
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275 test_bps = 4800;
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276 tep = FALSE;
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277 line_model_no = 0;
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278 decode_test_file = NULL;
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279 use_gui = FALSE;
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280 noise_level = -70;
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281 signal_level = -13;
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282 bits_per_test = 50000;
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283 log_audio = FALSE;
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284 for (i = 1; i < argc; i++)
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285 {
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286 if (strcmp(argv[i], "-b") == 0)
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287 {
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288 bits_per_test = atoi(argv[++i]);
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289 continue;
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290 }
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291 if (strcmp(argv[i], "-c") == 0)
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292 {
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293 channel_codec = atoi(argv[++i]);
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294 continue;
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295 }
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296 if (strcmp(argv[i], "-d") == 0)
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297 {
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298 decode_test_file = argv[++i];
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299 continue;
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300 }
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301 if (strcmp(argv[i], "-t") == 0)
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302 {
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303 tep = TRUE;
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304 continue;
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305 }
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306 if (strcmp(argv[i], "-g") == 0)
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307 {
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308 use_gui = TRUE;
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309 continue;
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310 }
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311 if (strcmp(argv[i], "-l") == 0)
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312 {
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313 log_audio = TRUE;
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314 continue;
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315 }
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316 if (strcmp(argv[i], "-m") == 0)
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317 {
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318 line_model_no = atoi(argv[++i]);
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319 continue;
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320 }
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321 if (strcmp(argv[i], "-n") == 0)
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322 {
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323 noise_level = atoi(argv[++i]);
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324 continue;
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325 }
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326 if (strcmp(argv[i], "-s") == 0)
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327 {
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328 signal_level = atoi(argv[++i]);
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329 continue;
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330 }
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331 if (strcmp(argv[i], "4800") == 0)
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332 test_bps = 4800;
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333 else if (strcmp(argv[i], "2400") == 0)
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334 test_bps = 2400;
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335 else
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336 {
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337 fprintf(stderr, "Invalid bit rate\n");
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338 exit(2);
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339 }
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340 }
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341 inhandle = NULL;
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342 outhandle = NULL;
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343
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344 filesetup = AF_NULL_FILESETUP;
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345 if (log_audio)
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346 {
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347 if ((filesetup = afNewFileSetup()) == AF_NULL_FILESETUP)
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348 {
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349 fprintf(stderr, " Failed to create file setup\n");
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350 exit(2);
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351 }
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352 afInitSampleFormat(filesetup, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, 16);
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353 afInitRate(filesetup, AF_DEFAULT_TRACK, (float) SAMPLE_RATE);
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354 afInitFileFormat(filesetup, AF_FILE_WAVE);
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355 afInitChannels(filesetup, AF_DEFAULT_TRACK, 1);
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356 if ((outhandle = afOpenFile(OUT_FILE_NAME, "w", filesetup)) == AF_NULL_FILEHANDLE)
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357 {
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358 fprintf(stderr, " Cannot create wave file '%s'\n", OUT_FILE_NAME);
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359 exit(2);
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360 }
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361 }
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362
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363 if (decode_test_file)
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364 {
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365 /* We will decode the audio from a wave file. */
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366 if ((inhandle = afOpenFile(decode_test_file, "r", NULL)) == AF_NULL_FILEHANDLE)
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367 {
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368 fprintf(stderr, " Cannot open wave file '%s'\n", decode_test_file);
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369 exit(2);
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370 }
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371 }
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372 else
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373 {
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374 /* We will generate V.27ter audio, and add some noise to it. */
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375 v27ter_tx_init(&tx, test_bps, tep, v27tergetbit, NULL);
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376 v27ter_tx_power(&tx, signal_level);
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377 /* Move the carrier off a bit */
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378 tx.carrier_phase_rate = dds_phase_ratef(1810.0f);
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379
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380 bert_init(&bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
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381 bert_set_report(&bert, 10000, reporter, NULL);
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382
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383 if ((line_model = one_way_line_model_init(line_model_no, (float) noise_level, channel_codec)) == NULL)
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384 {
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385 fprintf(stderr, " Failed to create line model\n");
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386 exit(2);
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387 }
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388 }
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389
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390 v27ter_rx_init(&rx, test_bps, v27terputbit, NULL);
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391 v27ter_rx_set_qam_report_handler(&rx, qam_report, (void *) &rx);
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392 span_log_set_level(&rx.logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_FLOW);
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393 span_log_set_tag(&rx.logging, "V.27ter-rx");
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394
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395 #if defined(ENABLE_GUI)
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396 if (use_gui)
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397 {
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398 qam_monitor = qam_monitor_init(2.0, NULL);
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399 if (!decode_test_file)
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400 {
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401 start_line_model_monitor(129);
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402 line_model_monitor_line_model_update(line_model->near_filter, line_model->near_filter_len);
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403 }
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404 }
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405 #endif
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406
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407 memset(&latest_results, 0, sizeof(latest_results));
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408 for (block = 0; ; block++)
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409 {
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410 if (decode_test_file)
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411 {
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412 samples = afReadFrames(inhandle,
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413 AF_DEFAULT_TRACK,
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414 amp,
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415 BLOCK_LEN);
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416 #if defined(ENABLE_GUI)
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417 if (use_gui)
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418 qam_monitor_update_audio_level(qam_monitor, amp, samples);
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419 #endif
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420 if (samples == 0)
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421 break;
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422 }
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423 else
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424 {
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425 samples = v27ter_tx(&tx, gen_amp, BLOCK_LEN);
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426 #if defined(ENABLE_GUI)
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427 if (use_gui)
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428 qam_monitor_update_audio_level(qam_monitor, gen_amp, samples);
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429 #endif
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430 if (samples == 0)
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431 {
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432 printf("Restarting on zero output\n");
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433
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434 /* Push a little silence through, to ensure all the data bits get out of the buffers */
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435 memset(amp, 0, BLOCK_LEN*sizeof(int16_t));
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436 v27ter_rx(&rx, amp, BLOCK_LEN);
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437 v27ter_rx(&rx, amp, BLOCK_LEN);
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438 v27ter_rx(&rx, amp, BLOCK_LEN);
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439
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440 /* Note that we might get a few bad bits as the carrier shuts down. */
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441 bert_result(&bert, &bert_results);
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442 fprintf(stderr, "Final result %ddBm0, %d bits, %d bad bits, %d resyncs\n", signal_level, bert_results.total_bits, bert_results.bad_bits, bert_results.resyncs);
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443 fprintf(stderr, "Last report %ddBm0, %d bits, %d bad bits, %d resyncs\n", signal_level, latest_results.total_bits, latest_results.bad_bits, latest_results.resyncs);
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444 /* See if bit errors are appearing yet. Also check we are getting enough bits out of the receiver. The last regular report
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445 should be error free, though the final report will generally contain bits errors as the carrier was dying. The total
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446 number of bits out of the receiver should be at least the number we sent. Also, since BERT sync should have occurred
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447 rapidly at the start of transmission, the last report should have occurred at not much less than the total number of
|
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448 bits we sent. */
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449 if (bert_results.total_bits < bits_per_test
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450 ||
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451 latest_results.total_bits < bits_per_test - 100
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452 ||
|
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453 latest_results.bad_bits != 0)
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454 {
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455 break;
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456 }
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457 memset(&latest_results, 0, sizeof(latest_results));
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458 signal_level--;
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459 v27ter_tx_restart(&tx, test_bps, tep);
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|
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460 v27ter_tx_power(&tx, signal_level);
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|
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461 v27ter_rx_restart(&rx, test_bps, FALSE);
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462 bert_init(&bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
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|
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463 bert_set_report(&bert, 10000, reporter, NULL);
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|
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464 one_way_line_model_release(line_model);
|
|
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465 if ((line_model = one_way_line_model_init(line_model_no, (float) noise_level, channel_codec)) == NULL)
|
|
|
466 {
|
|
|
467 fprintf(stderr, " Failed to create line model\n");
|
|
|
468 exit(2);
|
|
|
469 }
|
|
|
470 }
|
|
|
471
|
|
|
472 if (log_audio)
|
|
|
473 {
|
|
|
474 outframes = afWriteFrames(outhandle,
|
|
|
475 AF_DEFAULT_TRACK,
|
|
|
476 gen_amp,
|
|
|
477 samples);
|
|
|
478 if (outframes != samples)
|
|
|
479 {
|
|
|
480 fprintf(stderr, " Error writing wave file\n");
|
|
|
481 exit(2);
|
|
|
482 }
|
|
|
483 }
|
|
|
484 one_way_line_model(line_model, amp, gen_amp, samples);
|
|
|
485 }
|
|
|
486 #if defined(ENABLE_GUI)
|
|
|
487 if (use_gui && !decode_test_file)
|
|
|
488 line_model_monitor_line_spectrum_update(amp, samples);
|
|
|
489 #endif
|
|
|
490 v27ter_rx(&rx, amp, samples);
|
|
|
491 if (decode_test_file == NULL && block%500 == 0)
|
|
|
492 printf("Noise level is %d\n", noise_level);
|
|
|
493 }
|
|
|
494 if (decode_test_file)
|
|
|
495 {
|
|
|
496 #if defined(ENABLE_GUI)
|
|
|
497 if (use_gui)
|
|
|
498 qam_wait_to_end(qam_monitor);
|
|
|
499 #endif
|
|
|
500 }
|
|
|
501 else
|
|
|
502 {
|
|
|
503 bert_result(&bert, &bert_results);
|
|
|
504 fprintf(stderr, "At completion:\n");
|
|
|
505 fprintf(stderr, "Final result %ddBm0, %d bits, %d bad bits, %d resyncs\n", signal_level, bert_results.total_bits, bert_results.bad_bits, bert_results.resyncs);
|
|
|
506 fprintf(stderr, "Last report %ddBm0, %d bits, %d bad bits, %d resyncs\n", signal_level, latest_results.total_bits, latest_results.bad_bits, latest_results.resyncs);
|
|
|
507 one_way_line_model_release(line_model);
|
|
|
508 if (signal_level > -43)
|
|
|
509 {
|
|
|
510 printf("Tests failed.\n");
|
|
|
511 exit(2);
|
|
|
512 }
|
|
|
513
|
|
|
514 printf("Tests passed.\n");
|
|
|
515 }
|
|
|
516 if (log_audio)
|
|
|
517 {
|
|
|
518 if (afCloseFile(outhandle))
|
|
|
519 {
|
|
|
520 fprintf(stderr, " Cannot close wave file '%s'\n", OUT_FILE_NAME);
|
|
|
521 exit(2);
|
|
|
522 }
|
|
|
523 afFreeFileSetup(filesetup);
|
|
|
524 }
|
|
|
525 return 0;
|
|
|
526 }
|
|
|
527 /*- End of function --------------------------------------------------------*/
|
|
|
528 /*- End of file ------------------------------------------------------------*/
|
