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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 * g711_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) 2006 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: g711_tests.c,v 1.4 2006/11/19 14:07:27 steveu Exp $
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26 */
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27
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28 /*! \page g711_tests_page A-law and u-law conversion tests
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29 \section g711_tests_page_sec_1 What does it do?
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30
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31 \section g711_tests_page_sec_2 How is it used?
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32 */
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33
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34 #ifdef HAVE_CONFIG_H
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35 #include "config.h"
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36 #endif
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37
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38 #include <inttypes.h>
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39 #include <stdlib.h>
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40 #include <stdio.h>
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41 #include <fcntl.h>
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42 #include <string.h>
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43 #if defined(HAVE_TGMATH_H)
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44 #include <tgmath.h>
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45 #endif
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46 #if defined(HAVE_MATH_H)
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47 #include <math.h>
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48 #endif
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49 #include <assert.h>
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50 #include <audiofile.h>
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51 #include <tiffio.h>
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52
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53 #include "spandsp.h"
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54
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55 #define OUT_FILE_NAME "g711.wav"
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56
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57 int16_t amp[65536];
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58
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59 const uint8_t alaw_1khz_sine[] = {0x34, 0x21, 0x21, 0x34, 0xB4, 0xA1, 0xA1, 0xB4};
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60 const uint8_t ulaw_1khz_sine[] = {0x1E, 0x0B, 0x0B, 0x1E, 0x9E, 0x8B, 0x8B, 0x9E};
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61
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62 int main(int argc, char *argv[])
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63 {
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64 AFfilehandle outhandle;
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65 AFfilesetup filesetup;
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66 power_meter_t power_meter;
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67 int outframes;
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68 int i;
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69 int block;
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70 int pre;
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71 int post;
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72 int alaw_failures;
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73 int ulaw_failures;
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74 float worst_alaw;
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75 float worst_ulaw;
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76 float tmp;
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77
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78 if ((filesetup = afNewFileSetup()) == AF_NULL_FILESETUP)
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79 {
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80 fprintf(stderr, " Failed to create file setup\n");
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81 exit(2);
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82 }
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83 afInitSampleFormat(filesetup, AF_DEFAULT_TRACK, AF_SAMPFMT_TWOSCOMP, 16);
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84 afInitRate(filesetup, AF_DEFAULT_TRACK, (float) SAMPLE_RATE);
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85 afInitFileFormat(filesetup, AF_FILE_WAVE);
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86 afInitChannels(filesetup, AF_DEFAULT_TRACK, 1);
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87
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88 if ((outhandle = afOpenFile(OUT_FILE_NAME, "w", filesetup)) == AF_NULL_FILEHANDLE)
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89 {
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90 fprintf(stderr, " Cannot create wave file '%s'\n", OUT_FILE_NAME);
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91 exit(2);
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92 }
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93
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94 printf("Conversion accuracy tests.\n");
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95 alaw_failures = 0;
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96 ulaw_failures = 0;
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97 worst_alaw = 0.0;
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98 worst_ulaw = 0.0;
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99 for (block = 0; block < 1; block++)
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100 {
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101 for (i = 0; i < 65536; i++)
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102 {
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103 pre = i - 32768;
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104 post = alaw_to_linear(linear_to_alaw(pre));
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105 if (abs(pre) > 140)
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106 {
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107 tmp = (float) abs(post - pre)/(float) abs(pre);
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108 if (tmp > 0.10)
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109 {
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110 printf("A-law: Excessive error at %d (%d)\n", pre, post);
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111 alaw_failures++;
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112 }
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113 if (tmp > worst_alaw)
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114 worst_alaw = tmp;
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115 }
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116 else
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117 {
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118 /* Small values need different handling for sensible measurement */
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119 if (abs(post - pre) > 15)
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120 {
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121 printf("A-law: Excessive error at %d (%d)\n", pre, post);
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122 alaw_failures++;
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123 }
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124 }
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125 amp[i] = post;
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126 }
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127 outframes = afWriteFrames(outhandle,
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128 AF_DEFAULT_TRACK,
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129 amp,
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130 65536);
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131 if (outframes != 65536)
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132 {
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133 fprintf(stderr, " Error writing wave file\n");
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134 exit(2);
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135 }
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136 for (i = 0; i < 65536; i++)
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137 {
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138 pre = i - 32768;
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139 post = ulaw_to_linear(linear_to_ulaw(pre));
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140 if (abs(pre) > 40)
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141 {
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142 tmp = (float) abs(post - pre)/(float) abs(pre);
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143 if (tmp > 0.10)
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144 {
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145 printf("u-law: Excessive error at %d (%d)\n", pre, post);
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146 ulaw_failures++;
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147 }
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148 if (tmp > worst_ulaw)
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149 worst_ulaw = tmp;
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150 }
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151 else
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152 {
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153 /* Small values need different handling for sensible measurement */
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154 if (abs(post - pre) > 4)
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155 {
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156 printf("u-law: Excessive error at %d (%d)\n", pre, post);
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157 ulaw_failures++;
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158 }
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159 }
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160 amp[i] = post;
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161 }
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162 outframes = afWriteFrames(outhandle,
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163 AF_DEFAULT_TRACK,
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164 amp,
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165 65536);
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166 if (outframes != 65536)
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167 {
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168 fprintf(stderr, " Error writing wave file\n");
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169 exit(2);
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170 }
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171 }
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172 printf("Worst A-law error (ignoring small values) %f%%\n", worst_alaw*100.0);
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173 printf("Worst u-law error (ignoring small values) %f%%\n", worst_ulaw*100.0);
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174 if (alaw_failures || ulaw_failures)
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175 {
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176 printf("%d A-law values with excessive error\n", alaw_failures);
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177 printf("%d u-law values with excessive error\n", ulaw_failures);
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178 printf("Tests failed\n");
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179 exit(2);
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180 }
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181
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182 printf("Reference power level tests.\n");
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183 power_meter_init(&power_meter, 7);
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184
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185 for (i = 0; i < 8000; i++)
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186 {
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187 amp[i] = ulaw_to_linear(ulaw_1khz_sine[i & 7]);
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188 power_meter_update(&power_meter, amp[i]);
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189 }
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190 printf("Reference u-law 1kHz tone is %fdBm0\n", power_meter_dbm0(&power_meter));
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191 outframes = afWriteFrames(outhandle,
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192 AF_DEFAULT_TRACK,
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193 amp,
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194 8000);
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195 if (outframes != 8000)
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196 {
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197 fprintf(stderr, " Error writing wave file\n");
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198 exit(2);
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199 }
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200 if (0.1f < fabs(power_meter_dbm0(&power_meter)))
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201 {
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202 printf("Test failed.\n");
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203 exit(2);
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204 }
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205
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206 for (i = 0; i < 8000; i++)
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207 {
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208 amp[i] = alaw_to_linear(alaw_1khz_sine[i & 7]);
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209 power_meter_update(&power_meter, amp[i]);
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210 }
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211 printf("Reference A-law 1kHz tone is %fdBm0\n", power_meter_dbm0(&power_meter));
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212 outframes = afWriteFrames(outhandle,
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213 AF_DEFAULT_TRACK,
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214 amp,
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215 8000);
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216 if (outframes != 8000)
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217 {
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218 fprintf(stderr, " Error writing wave file\n");
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219 exit(2);
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220 }
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221 if (0.1f < fabs(power_meter_dbm0(&power_meter)))
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222 {
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223 printf("Test failed.\n");
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224 exit(2);
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225 }
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226
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227 /* Check the transcoding functions. */
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228 printf("Testing transcoding A-law -> u-law -> A-law\n");
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229 for (i = 0; i < 256; i++)
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230 {
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231 if (alaw_to_ulaw(ulaw_to_alaw(i)) != i)
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232 {
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233 if (abs(alaw_to_ulaw(ulaw_to_alaw(i)) - i) > 1)
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234 {
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235 printf("u-law -> A-law -> u-law gave %d -> %d\n", i, alaw_to_ulaw(ulaw_to_alaw(i)));
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236 printf("Test failed\n");
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237 exit(2);
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238 }
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239 }
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240 }
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241
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242 printf("Testing transcoding u-law -> A-law -> u-law\n");
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243 for (i = 0; i < 256; i++)
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244 {
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245 if (ulaw_to_alaw(alaw_to_ulaw(i)) != i)
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246 {
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247 if (abs(alaw_to_ulaw(ulaw_to_alaw(i)) - i) > 1)
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248 {
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249 printf("A-law -> u-law -> A-law gave %d -> %d\n", i, ulaw_to_alaw(alaw_to_ulaw(i)));
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250 printf("Test failed\n");
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251 exit(2);
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252 }
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253 }
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254 }
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255
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256 if (afCloseFile(outhandle))
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257 {
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258 fprintf(stderr, " Cannot close wave file '%s'\n", OUT_FILE_NAME);
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259 exit(2);
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260 }
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261 afFreeFileSetup(filesetup);
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262
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263 printf("Tests passed.\n");
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264 return 0;
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265 }
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266 /*- End of function --------------------------------------------------------*/
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267 /*- End of file ------------------------------------------------------------*/
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