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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 * v22bis_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) 2004 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: v22bis_tests.c,v 1.37 2006/11/19 14:07:27 steveu Exp $
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26 */
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27
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28 /*! \page v22bis_tests_page V.22bis modem tests
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29 \section v22bis_tests_page_sec_1 What does it do?
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30 These tests connect two V.22bis modems back to back, through a telephone line
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31 model. BER testing is then used to evaluate performance under various line
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32 conditions.
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33
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34 If the appropriate GUI environment exists, the tests are built such that a visual
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35 display of modem status is maintained.
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36
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37 \section v22bis_tests_page_sec_2 How is it used?
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38 */
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39
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40 #ifdef HAVE_CONFIG_H
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41 #include "config.h"
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42 #endif
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43
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44 #if defined(HAVE_FL_FL_H) && defined(HAVE_FL_FL_CARTESIAN_H) && defined(HAVE_FL_FL_AUDIO_METER_H)
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45 #define ENABLE_GUI
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46 #endif
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47
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48 #include <inttypes.h>
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49 #include <stdlib.h>
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50 #include <stdio.h>
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51 #include <fcntl.h>
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52 #include <string.h>
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53 #if defined(HAVE_TGMATH_H)
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54 #include <tgmath.h>
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55 #endif
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56 #if defined(HAVE_MATH_H)
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57 #include <math.h>
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58 #endif
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59 #include <assert.h>
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60 #include <audiofile.h>
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61 #include <tiffio.h>
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62
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63 #include "spandsp.h"
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64 #include "test_utils.h"
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65 #include "line_model.h"
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66 #if defined(ENABLE_GUI)
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67 #include "modem_monitor.h"
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68 #endif
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69
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70 #define BLOCK_LEN 160
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71
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72 #define IN_FILE_NAME "v22bis_samp.wav"
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73 #define OUT_FILE_NAME "v22bis.wav"
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74
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75 int in_bit = 0;
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76 int out_bit = 0;
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77
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78 int in_bit_no = 0;
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79 int out_bit_no = 0;
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80
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81 uint8_t tx_buf[1000];
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82 int rx_ptr = 0;
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83 int tx_ptr = 0;
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84
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85 int rx_bits = 0;
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86 int rx_bad_bits = 0;
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87
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88 int use_gui = FALSE;
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89
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90 both_ways_line_model_state_t *model;
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91
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92 v22bis_state_t caller;
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93 v22bis_state_t answerer;
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94
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95 struct qam_report_control_s
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96 {
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97 v22bis_state_t *s;
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98 #if defined(ENABLE_GUI)
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99 qam_monitor_t *qam_monitor;
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100 #endif
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101 float smooth_power;
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102 int symbol_no;
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103 };
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104
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105 struct qam_report_control_s qam_caller;
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106 struct qam_report_control_s qam_answerer;
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107
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108 static void v22bis_putbit(void *user_data, int bit)
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109 {
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110 v22bis_state_t *s;
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111 int i;
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112 int len;
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113 complexf_t *coeffs;
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114
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115 s = (v22bis_state_t *) user_data;
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116 if (bit < 0)
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117 {
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118 /* Special conditions */
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119 switch (bit)
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120 {
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121 case PUTBIT_TRAINING_FAILED:
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122 printf("Training failed\n");
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123 break;
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124 case PUTBIT_TRAINING_SUCCEEDED:
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125 printf("Training succeeded\n");
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126 len = v22bis_rx_equalizer_state(s, &coeffs);
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127 printf("Equalizer:\n");
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128 for (i = 0; i < len; i++)
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129 printf("%3d (%15.5f, %15.5f) -> %15.5f\n", i, coeffs[i].re, coeffs[i].im, powerf(&coeffs[i]));
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130 break;
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131 case PUTBIT_CARRIER_UP:
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132 printf("Carrier up\n");
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133 break;
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134 case PUTBIT_CARRIER_DOWN:
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135 printf("Carrier down\n");
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136 break;
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137 default:
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138 printf("Eh!\n");
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139 break;
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140 }
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141 return;
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142 }
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143
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144 if (bit != tx_buf[rx_ptr])
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145 {
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146 printf("Rx bit %d - %d\n", rx_bits, bit);
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147 rx_bad_bits++;
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148 }
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149 rx_ptr++;
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150 if (rx_ptr > 1000)
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151 rx_ptr = 0;
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152 rx_bits++;
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153 if ((rx_bits % 100000) == 0)
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154 {
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155 printf("%d bits received, %d bad bits\r", rx_bits, rx_bad_bits);
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156 fflush(stdout);
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157 }
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158 }
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159 /*- End of function --------------------------------------------------------*/
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160
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161 static int v22bis_getbit(void *user_data)
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162 {
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163 int bit;
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164 static int tx_bits = 0;
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165
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166 bit = rand() & 1;
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167 tx_buf[tx_ptr++] = bit;
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168 if (tx_ptr > 1000)
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169 tx_ptr = 0;
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170 //printf("Tx bit %d\n", bit);
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171 if (++tx_bits > 100000)
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172 {
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173 tx_bits = 0;
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174 bit = 2;
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175 }
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176 return bit;
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177 }
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178 /*- End of function --------------------------------------------------------*/
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179
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180 static void qam_report(void *user_data, const complexf_t *constel, const complexf_t *target, int symbol)
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181 {
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182 int i;
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183 int len;
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184 complexf_t *coeffs;
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185 float fpower;
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186 struct qam_report_control_s *s;
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187
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188 s = (struct qam_report_control_s *) user_data;
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189 if (constel)
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190 {
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191 #if defined(ENABLE_GUI)
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192 if (use_gui)
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193 {
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194 qam_monitor_update_constel(s->qam_monitor, constel);
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195 qam_monitor_update_carrier_tracking(s->qam_monitor, v22bis_rx_carrier_frequency(s->s));
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196 qam_monitor_update_symbol_tracking(s->qam_monitor, v22bis_rx_symbol_timing_correction(s->s));
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197 }
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198 #endif
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199 fpower = (constel->re - target->re)*(constel->re - target->re)
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200 + (constel->im - target->im)*(constel->im - target->im);
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201 s->smooth_power = 0.95*s->smooth_power + 0.05*fpower;
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202 printf("%8d [%8.4f, %8.4f] [%8.4f, %8.4f] %8.4f %8.4f\n", s->symbol_no, constel->re, constel->im, target->re, target->im, fpower, s->smooth_power);
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203 s->symbol_no++;
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204 }
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205 else
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206 {
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207 printf("Gardner step %d\n", symbol);
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208 len = v22bis_rx_equalizer_state(s->s, &coeffs);
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209 printf("Equalizer A:\n");
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210 for (i = 0; i < len; i++)
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211 printf("%3d (%15.5f, %15.5f) -> %15.5f\n", i, coeffs[i].re, coeffs[i].im, powerf(&coeffs[i]));
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212 #if defined(ENABLE_GUI)
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213 if (use_gui)
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214 qam_monitor_update_equalizer(s->qam_monitor, coeffs, len);
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215 #endif
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216 }
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217 }
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218 /*- End of function --------------------------------------------------------*/
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219
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220 int main(int argc, char *argv[])
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221 {
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222 int16_t caller_amp[BLOCK_LEN];
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223 int16_t answerer_amp[BLOCK_LEN];
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224 int16_t caller_model_amp[BLOCK_LEN];
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225 int16_t answerer_model_amp[BLOCK_LEN];
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226 int16_t out_amp[2*BLOCK_LEN];
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227 AFfilehandle outhandle;
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228 AFfilesetup filesetup;
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229 int outframes;
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230 int samples;
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231 int i;
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232 int test_bps;
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233 int line_model_no;
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234 int bits_per_test;
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235 int noise_level;
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236 int signal_level;
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237 int log_audio;
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238 int channel_codec;
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239
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240 channel_codec = MUNGE_CODEC_NONE;
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241 test_bps = 2400;
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242 line_model_no = 0;
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243 noise_level = -70;
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244 signal_level = -13;
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245 bits_per_test = 50000;
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246 log_audio = FALSE;
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247 for (i = 1; i < argc; i++)
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248 {
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249 if (strcmp(argv[i], "-b") == 0)
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250 {
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251 bits_per_test = atoi(argv[++i]);
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252 continue;
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253 }
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254 if (strcmp(argv[i], "-c") == 0)
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255 {
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256 channel_codec = atoi(argv[++i]);
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257 continue;
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258 }
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259 if (strcmp(argv[i], "-g") == 0)
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260 {
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261 use_gui = TRUE;
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262 continue;
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263 }
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264 if (strcmp(argv[i], "-m") == 0)
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265 {
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266 log_audio = TRUE;
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267 continue;
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268 }
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269 if (strcmp(argv[i], "-m") == 0)
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270 {
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271 line_model_no = atoi(argv[++i]);
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272 continue;
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273 }
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274 if (strcmp(argv[i], "-n") == 0)
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275 {
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276 noise_level = atoi(argv[++i]);
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277 continue;
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278 }
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279 if (strcmp(argv[i], "-s") == 0)
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280 {
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281 signal_level = atoi(argv[++i]);
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282 continue;
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283 }
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284 if (strcmp(argv[i], "2400") == 0)
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285 test_bps = 2400;
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286 else if (strcmp(argv[i], "1200") == 0)
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287 test_bps = 1200;
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288 else
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289 {
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290 fprintf(stderr, "Invalid bit rate\n");
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291 exit(2);
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292 }
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293 }
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294 filesetup = AF_NULL_FILESETUP;
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295 outhandle = AF_NULL_FILEHANDLE;
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296 if (log_audio)
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297 {
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298 if ((filesetup = afNewFileSetup()) == AF_NULL_FILESETUP)
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299 {
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300 fprintf(stderr, " Failed to create file setup\n");
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301 exit(2);
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302 }
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303 afInitSampleFormat(filesetup, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, 16);
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304 afInitRate(filesetup, AF_DEFAULT_TRACK, (float) SAMPLE_RATE);
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305 afInitFileFormat(filesetup, AF_FILE_WAVE);
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306 afInitChannels(filesetup, AF_DEFAULT_TRACK, 2);
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307
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308 if ((outhandle = afOpenFile(OUT_FILE_NAME, "w", filesetup)) == AF_NULL_FILEHANDLE)
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309 {
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310 fprintf(stderr, " Cannot create wave file '%s'\n", OUT_FILE_NAME);
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311 exit(2);
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312 }
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313 }
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314 v22bis_init(&caller, test_bps, 2, TRUE, v22bis_getbit, v22bis_putbit, &caller);
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315 v22bis_tx_power(&caller, signal_level);
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316 /* Move the carrier off a bit */
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317 caller.tx_carrier_phase_rate = dds_phase_ratef(1207.0);
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318 v22bis_init(&answerer, test_bps, 2, FALSE, v22bis_getbit, v22bis_putbit, &answerer);
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319 v22bis_tx_power(&answerer, signal_level);
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320 answerer.tx_carrier_phase_rate = dds_phase_ratef(2407.0);
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321 v22bis_rx_set_qam_report_handler(&caller, qam_report, (void *) &qam_caller);
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322 v22bis_rx_set_qam_report_handler(&answerer, qam_report, (void *) &qam_answerer);
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323 span_log_set_level(&caller.logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_SHOW_TAG | SPAN_LOG_FLOW);
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324 span_log_set_tag(&caller.logging, "caller");
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325 span_log_set_level(&answerer.logging, SPAN_LOG_SHOW_SEVERITY | SPAN_LOG_SHOW_PROTOCOL | SPAN_LOG_SHOW_TAG | SPAN_LOG_FLOW);
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326 span_log_set_tag(&answerer.logging, "answerer");
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327
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328 qam_caller.s = &caller;
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329 qam_caller.smooth_power = 0.0;
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330 qam_caller.symbol_no = 0;
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331
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332 qam_answerer.s = &answerer;
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333 qam_answerer.smooth_power = 0.0;
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334 qam_answerer.symbol_no = 0;
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335
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336 #if defined(ENABLE_GUI)
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337 if (use_gui)
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338 {
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339 qam_caller.qam_monitor = qam_monitor_init(6.0, "Calling modem");
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340 qam_answerer.qam_monitor = qam_monitor_init(6.0, "Answering modem");
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341 }
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342 #endif
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343
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344 if ((model = both_ways_line_model_init(line_model_no, (float) noise_level, line_model_no, (float) noise_level, channel_codec)) == NULL)
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345 {
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346 fprintf(stderr, " Failed to create line model\n");
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347 exit(2);
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348 }
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349 for (;;)
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350 {
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351 samples = v22bis_tx(&caller, caller_amp, BLOCK_LEN);
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352 #if defined(ENABLE_GUI)
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353 if (use_gui)
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354 qam_monitor_update_audio_level(qam_caller.qam_monitor, caller_amp, samples);
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355 #endif
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356 if (samples == 0)
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357 {
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358 printf("Restarting on zero output\n");
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359 v22bis_restart(&caller, test_bps);
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360 rx_ptr = 0;
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361 tx_ptr = 0;
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362 }
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363
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364 samples = v22bis_tx(&answerer, answerer_amp, BLOCK_LEN);
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365 #if defined(ENABLE_GUI)
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366 if (use_gui)
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367 qam_monitor_update_audio_level(qam_answerer.qam_monitor, answerer_amp, samples);
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368 #endif
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369 if (samples == 0)
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370 {
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371 printf("Restarting on zero output\n");
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372 v22bis_restart(&answerer, test_bps);
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373 rx_ptr = 0;
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374 tx_ptr = 0;
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375 }
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376
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377 both_ways_line_model(model,
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378 caller_model_amp,
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379 caller_amp,
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380 answerer_model_amp,
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381 answerer_amp,
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382 samples);
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383
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384 v22bis_rx(&answerer, caller_model_amp, samples);
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385 for (i = 0; i < samples; i++)
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386 out_amp[2*i] = caller_model_amp[i];
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387 for ( ; i < BLOCK_LEN; i++)
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388 out_amp[2*i] = 0;
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389
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390 v22bis_rx(&caller, answerer_model_amp, samples);
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391 for (i = 0; i < samples; i++)
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392 out_amp[2*i + 1] = answerer_model_amp[i];
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393 for ( ; i < BLOCK_LEN; i++)
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394 out_amp[2*i + 1] = 0;
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395
|
|
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396 if (log_audio)
|
|
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397 {
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398 outframes = afWriteFrames(outhandle,
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|
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399 AF_DEFAULT_TRACK,
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400 out_amp,
|
|
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401 BLOCK_LEN);
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402 if (outframes != BLOCK_LEN)
|
|
|
403 {
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|
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404 fprintf(stderr, " Error writing wave file\n");
|
|
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405 exit(2);
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|
|
406 }
|
|
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407 }
|
|
|
408 }
|
|
|
409 if (log_audio)
|
|
|
410 {
|
|
|
411 if (afCloseFile(outhandle) != 0)
|
|
|
412 {
|
|
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413 fprintf(stderr, " Cannot close wave file '%s'\n", OUT_FILE_NAME);
|
|
|
414 exit(2);
|
|
|
415 }
|
|
|
416 afFreeFileSetup(filesetup);
|
|
|
417 }
|
|
|
418 return 0;
|
|
|
419 }
|
|
|
420 /*- End of function --------------------------------------------------------*/
|
|
|
421 /*- End of file ------------------------------------------------------------*/
|
