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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 * fsk_tests.c - Tests for the low speed FSK modem code (V.21, V.23, etc.).
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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: fsk_tests.c,v 1.30 2006/11/19 14:07:27 steveu Exp $
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26 */
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27
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28 /*! \page fsk_tests_page FSK modem tests
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29 \section fsk_tests_page_sec_1 What does it do?
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30 These tests allow either:
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31
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32 - An FSK transmit modem to feed an FSK receive modem, of the same type,
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33 through a telephone line model. BER testing is then used to evaluate
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34 performance under various line conditions. This is effective for testing
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35 the basic performance of the receive modem. It is also the only test mode
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36 provided for evaluating the transmit modem.
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37
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38 - An FSK receive modem is used to decode FSK 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 \section fsk_tests_page_sec_2 How does it work?
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43 */
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44
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45 #ifdef HAVE_CONFIG_H
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46 #include "config.h"
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47 #endif
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48
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49 #include <inttypes.h>
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50 #include <stdlib.h>
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51 #include <stdio.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
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67 #define BLOCK_LEN 160
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68
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69 #define OUTPUT_FILE_NAME "fsk.wav"
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70
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71 char *decode_test_file = NULL;
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72 both_ways_line_model_state_t *model;
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73 int rx_bits = 0;
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74
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75 static void put_bit(void *user_data, int bit)
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76 {
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77 if (bit < 0)
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78 {
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79 /* Special conditions */
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80 switch (bit)
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81 {
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82 case PUTBIT_TRAINING_FAILED:
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83 printf("Training failed\n");
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84 break;
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85 case PUTBIT_TRAINING_SUCCEEDED:
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86 printf("Training succeeded\n");
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87 break;
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88 case PUTBIT_CARRIER_UP:
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89 printf("Carrier up\n");
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90 break;
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91 case PUTBIT_CARRIER_DOWN:
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92 printf("Carrier down\n");
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93 break;
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94 default:
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95 printf("Eh!\n");
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96 break;
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97 }
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98 return;
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99 }
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100
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101 printf("Rx bit %d - %d\n", rx_bits++, bit);
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102 }
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103 /*- End of function --------------------------------------------------------*/
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104
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105 static void reporter(void *user_data, int reason, bert_results_t *results)
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106 {
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107 int channel;
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108
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109 channel = (int) (intptr_t) user_data;
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110 switch (reason)
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111 {
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112 case BERT_REPORT_SYNCED:
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113 printf("%d: BERT report synced\n", channel);
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114 break;
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115 case BERT_REPORT_UNSYNCED:
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116 printf("%d: BERT report unsync'ed\n", channel);
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117 break;
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118 case BERT_REPORT_REGULAR:
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119 printf("%d: BERT report regular - %d bits, %d bad bits, %d resyncs\n", channel, results->total_bits, results->bad_bits, results->resyncs);
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120 break;
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121 case BERT_REPORT_GT_10_2:
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122 printf("%d: BERT report > 1 in 10^2\n", channel);
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123 break;
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124 case BERT_REPORT_LT_10_2:
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125 printf("%d: BERT report < 1 in 10^2\n", channel);
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126 break;
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127 case BERT_REPORT_LT_10_3:
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128 printf("%d: BERT report < 1 in 10^3\n", channel);
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129 break;
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130 case BERT_REPORT_LT_10_4:
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131 printf("%d: BERT report < 1 in 10^4\n", channel);
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132 break;
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133 case BERT_REPORT_LT_10_5:
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134 printf("%d: BERT report < 1 in 10^5\n", channel);
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135 break;
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136 case BERT_REPORT_LT_10_6:
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137 printf("%d: BERT report < 1 in 10^6\n", channel);
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138 break;
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139 case BERT_REPORT_LT_10_7:
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140 printf("%d: BERT report < 1 in 10^7\n", channel);
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141 break;
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142 default:
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143 printf("%d: BERT report reason %d\n", channel, reason);
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144 break;
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145 }
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146 }
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147 /*- End of function --------------------------------------------------------*/
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148
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149 int main(int argc, char *argv[])
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150 {
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151 fsk_tx_state_t caller_tx;
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152 fsk_rx_state_t caller_rx;
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153 fsk_tx_state_t answerer_tx;
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154 fsk_rx_state_t answerer_rx;
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155 bert_state_t caller_bert;
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156 bert_state_t answerer_bert;
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157 bert_results_t bert_results;
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158 power_meter_t caller_meter;
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159 power_meter_t answerer_meter;
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160 int16_t caller_amp[BLOCK_LEN];
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161 int16_t answerer_amp[BLOCK_LEN];
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162 int16_t caller_model_amp[BLOCK_LEN];
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163 int16_t answerer_model_amp[BLOCK_LEN];
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164 int16_t out_amp[2*BLOCK_LEN];
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165 AFfilehandle inhandle;
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166 AFfilehandle outhandle;
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167 AFfilesetup filesetup;
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168 int outframes;
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169 int i;
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170 int samples;
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171 int test_bps;
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172 int noise_level;
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173 int noise_sweep;
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174 int bits_per_test;
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175 int line_model_no;
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176 int modem_under_test_1;
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177 int modem_under_test_2;
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178 int log_audio;
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179 int channel_codec;
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180
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181 channel_codec = MUNGE_CODEC_NONE;
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182 line_model_no = 0;
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183 decode_test_file = NULL;
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184 noise_sweep = FALSE;
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185 modem_under_test_1 = FSK_V21CH1;
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186 modem_under_test_2 = FSK_V21CH2;
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187 log_audio = FALSE;
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188 for (i = 1; i < argc; i++)
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189 {
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190 if (strcmp(argv[i], "-c") == 0)
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191 {
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192 channel_codec = atoi(argv[++i]);
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193 continue;
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194 }
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195 if (strcmp(argv[i], "-d") == 0)
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196 {
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197 i++;
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198 decode_test_file = argv[i];
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199 continue;
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200 }
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201 if (strcmp(argv[i], "-m") == 0)
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202 {
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203 i++;
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204 line_model_no = atoi(argv[i]);
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205 continue;
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206 }
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207 if (strcmp(argv[i], "-s") == 0)
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208 {
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209 i++;
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210 modem_under_test_1 = atoi(argv[i]);
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211 i++;
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212 modem_under_test_2 = atoi(argv[i]);
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213 continue;
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214 }
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215 if (strcmp(argv[i], "-n") == 0)
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216 {
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217 noise_sweep = TRUE;
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218 continue;
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219 }
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220 if (strcmp(argv[i], "-l") == 0)
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221 {
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222 log_audio = TRUE;
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223 continue;
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224 }
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225 }
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226
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227 filesetup = AF_NULL_FILESETUP;
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228 outhandle = AF_NULL_FILEHANDLE;
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229
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230 if (log_audio)
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231 {
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232 if ((filesetup = afNewFileSetup()) == AF_NULL_FILESETUP)
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233 {
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234 fprintf(stderr, " Failed to create file setup\n");
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235 exit(2);
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236 }
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237 afInitSampleFormat(filesetup, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, 16);
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238 afInitRate(filesetup, AF_DEFAULT_TRACK, (float) SAMPLE_RATE);
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239 afInitFileFormat(filesetup, AF_FILE_WAVE);
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240 afInitChannels(filesetup, AF_DEFAULT_TRACK, 2);
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241 }
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242 noise_level = -200;
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243 bits_per_test = 0;
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244 inhandle = NULL;
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245 if (decode_test_file)
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246 {
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247 if ((inhandle = afOpenFile(decode_test_file, "r", NULL)) == AF_NULL_FILEHANDLE)
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248 {
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249 fprintf(stderr, " Cannot open wave file '%s'\n", decode_test_file);
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250 exit(2);
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251 }
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252 fsk_rx_init(&caller_rx, &preset_fsk_specs[modem_under_test_1], TRUE, put_bit, NULL);
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253 test_bps = preset_fsk_specs[modem_under_test_1].baud_rate;
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254 }
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255 else
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256 {
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257 printf("Test with BERT\n");
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258 if (modem_under_test_1 >= 0)
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259 {
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260 fsk_tx_init(&caller_tx, &preset_fsk_specs[modem_under_test_1], (get_bit_func_t) bert_get_bit, &caller_bert);
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261 fsk_rx_init(&answerer_rx, &preset_fsk_specs[modem_under_test_1], TRUE, (put_bit_func_t) bert_put_bit, &answerer_bert);
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262 }
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263 if (modem_under_test_2 >= 0)
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264 {
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265 fsk_tx_init(&answerer_tx, &preset_fsk_specs[modem_under_test_2], (get_bit_func_t) bert_get_bit, &answerer_bert);
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266 fsk_rx_init(&caller_rx, &preset_fsk_specs[modem_under_test_2], TRUE, (put_bit_func_t) bert_put_bit, &caller_bert);
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267 }
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268 test_bps = preset_fsk_specs[modem_under_test_1].baud_rate;
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269
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270 bits_per_test = 500000;
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271 noise_level = -24;
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272
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273 bert_init(&caller_bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
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274 bert_set_report(&caller_bert, 100000, reporter, (void *) (intptr_t) 1);
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275 bert_init(&answerer_bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
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276 bert_set_report(&answerer_bert, 100000, reporter, (void *) (intptr_t) 2);
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277 if ((model = both_ways_line_model_init(line_model_no, (float) noise_level, line_model_no, noise_level, channel_codec)) == NULL)
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278 {
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279 fprintf(stderr, " Failed to create line model\n");
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280 exit(2);
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281 }
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282 }
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283 if (log_audio)
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284 {
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285 if ((outhandle = afOpenFile(OUTPUT_FILE_NAME, "w", filesetup)) == AF_NULL_FILEHANDLE)
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286 {
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287 fprintf(stderr, " Cannot create wave file '%s'\n", OUTPUT_FILE_NAME);
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288 exit(2);
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289 }
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290 }
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291
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292 if (modem_under_test_1 >= 0)
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293 printf("Modem channel 1 is '%s'\n", preset_fsk_specs[modem_under_test_1].name);
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294 if (modem_under_test_2 >= 0)
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295 printf("Modem channel 2 is '%s'\n", preset_fsk_specs[modem_under_test_2].name);
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296 memset(caller_amp, 0, sizeof(*caller_amp));
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297 memset(answerer_amp, 0, sizeof(*answerer_amp));
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298 memset(caller_model_amp, 0, sizeof(*caller_model_amp));
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299 memset(answerer_model_amp, 0, sizeof(*answerer_model_amp));
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300 power_meter_init(&caller_meter, 7);
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301 power_meter_init(&answerer_meter, 7);
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302 for (;;)
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303 {
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304 if (decode_test_file)
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305 {
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306 samples = afReadFrames(inhandle,
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307 AF_DEFAULT_TRACK,
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308 caller_model_amp,
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309 BLOCK_LEN);
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310 if (samples < BLOCK_LEN)
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311 break;
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312 for (i = 0; i < samples; i++)
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313 power_meter_update(&caller_meter, caller_model_amp[i]);
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314 }
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315 else
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316 {
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317 samples = fsk_tx(&caller_tx, caller_amp, BLOCK_LEN);
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318 for (i = 0; i < samples; i++)
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319 power_meter_update(&caller_meter, caller_amp[i]);
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320 samples = fsk_tx(&answerer_tx, answerer_amp, BLOCK_LEN);
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321 for (i = 0; i < samples; i++)
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322 power_meter_update(&answerer_meter, answerer_amp[i]);
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323 both_ways_line_model(model,
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324 caller_model_amp,
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325 caller_amp,
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326 answerer_model_amp,
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327 answerer_amp,
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328 samples);
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329 }
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330 //printf("Powers %10.5fdBm0 %10.5fdBm0\n", power_meter_dbm0(&caller_meter), power_meter_dbm0(&answerer_meter));
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331
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332 fsk_rx(&answerer_rx, caller_model_amp, samples);
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333 for (i = 0; i < samples; i++)
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334 out_amp[2*i] = caller_model_amp[i];
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335 for ( ; i < BLOCK_LEN; i++)
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336 out_amp[2*i] = 0;
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337
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338 fsk_rx(&caller_rx, answerer_model_amp, samples);
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339 for (i = 0; i < samples; i++)
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340 out_amp[2*i + 1] = answerer_model_amp[i];
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341 for ( ; i < BLOCK_LEN; i++)
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342 out_amp[2*i + 1] = 0;
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343
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344 if (log_audio)
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345 {
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346 outframes = afWriteFrames(outhandle,
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347 AF_DEFAULT_TRACK,
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348 out_amp,
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349 BLOCK_LEN);
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350 if (outframes != BLOCK_LEN)
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351 {
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352 fprintf(stderr, " Error writing wave file\n");
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353 exit(2);
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354 }
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355 }
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356
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357 if (samples < BLOCK_LEN)
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358 {
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359 bert_result(&caller_bert, &bert_results);
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360 fprintf(stderr, "%ddB AWGN, %d bits, %d bad bits, %d resyncs\n", noise_level, bert_results.total_bits, bert_results.bad_bits, bert_results.resyncs);
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361 if (!noise_sweep)
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362 {
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363 if (bert_results.total_bits != bits_per_test - 43
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364 ||
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365 bert_results.bad_bits != 0
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366 ||
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367 bert_results.resyncs != 0)
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368 {
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369 printf("Tests failed.\n");
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370 exit(2);
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371 }
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372 }
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373 bert_result(&answerer_bert, &bert_results);
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374 fprintf(stderr, "%ddB AWGN, %d bits, %d bad bits, %d resyncs\n", noise_level, bert_results.total_bits, bert_results.bad_bits, bert_results.resyncs);
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375 if (!noise_sweep)
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376 {
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377 if (bert_results.total_bits != bits_per_test - 43
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378 ||
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379 bert_results.bad_bits != 0
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380 ||
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381 bert_results.resyncs != 0)
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382 {
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383 printf("Tests failed.\n");
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384 exit(2);
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385 }
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386 break;
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387 }
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388
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389 /* Put a little silence between the chunks in the file. */
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390 memset(out_amp, 0, sizeof(out_amp));
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391 if (log_audio)
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392 {
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393 for (i = 0; i < 200; i++)
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394 {
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395 outframes = afWriteFrames(outhandle,
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396 AF_DEFAULT_TRACK,
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397 out_amp,
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398 BLOCK_LEN);
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399 }
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400 }
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401 if (modem_under_test_1 >= 0)
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402 {
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403 fsk_tx_init(&caller_tx, &preset_fsk_specs[modem_under_test_1], (get_bit_func_t) bert_get_bit, &caller_bert);
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404 fsk_rx_init(&answerer_rx, &preset_fsk_specs[modem_under_test_1], TRUE, (put_bit_func_t) bert_put_bit, &answerer_bert);
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405 }
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406 if (modem_under_test_2 >= 0)
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407 {
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408 fsk_tx_init(&answerer_tx, &preset_fsk_specs[modem_under_test_2], (get_bit_func_t) bert_get_bit, &answerer_bert);
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409 fsk_rx_init(&caller_rx, &preset_fsk_specs[modem_under_test_2], TRUE, (put_bit_func_t) bert_put_bit, &caller_bert);
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|
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410 }
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|
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411 noise_level++;
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412 if ((model = both_ways_line_model_init(line_model_no, (float) noise_level, line_model_no, noise_level, channel_codec)) == NULL)
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|
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413 {
|
|
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414 fprintf(stderr, " Failed to create line model\n");
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415 exit(2);
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|
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416 }
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417 bert_init(&caller_bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
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|
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418 bert_set_report(&caller_bert, 100000, reporter, (void *) (intptr_t) 1);
|
|
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419 bert_init(&answerer_bert, bits_per_test, BERT_PATTERN_ITU_O152_11, test_bps, 20);
|
|
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420 bert_set_report(&answerer_bert, 100000, reporter, (void *) (intptr_t) 2);
|
|
|
421 }
|
|
|
422 }
|
|
|
423
|
|
|
424 if (log_audio)
|
|
|
425 {
|
|
|
426 if (afCloseFile(outhandle) != 0)
|
|
|
427 {
|
|
|
428 fprintf(stderr, " Cannot close wave file '%s'\n", OUTPUT_FILE_NAME);
|
|
|
429 exit(2);
|
|
|
430 }
|
|
|
431 afFreeFileSetup(filesetup);
|
|
|
432 }
|
|
|
433 if (decode_test_file)
|
|
|
434 {
|
|
|
435 if (afCloseFile(inhandle) != 0)
|
|
|
436 {
|
|
|
437 fprintf(stderr, " Cannot close wave file '%s'\n", decode_test_file);
|
|
|
438 exit(2);
|
|
|
439 }
|
|
|
440 }
|
|
|
441 else
|
|
|
442 {
|
|
|
443 printf("Tests passed.\n");
|
|
|
444 }
|
|
|
445 return 0;
|
|
|
446 }
|
|
|
447 /*- End of function --------------------------------------------------------*/
|
|
|
448 /*- End of file ------------------------------------------------------------*/
|
