FreeCalypso > hg > gsm-codec-lib

annotate frtest/hand-test.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents d21c68b8f16c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
29
d21c68b8f16c gsmfr-hand-test: yet another debug aid
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1 /*
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2 * This program is a debug aid that allows a developer to hand-craft input
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3 * to the GSM 06.10 decoder (libgsm) and see what output magnitude it results
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4 * in, in the style of gsmfr-max-out. This program reads input from an
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5 * ASCII text file in the same format as gsmrec-dump, performs gsm_implode()
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6 * and gsm_decode() operations and reports maximum output magnitude for
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7 * each processed frame.
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8 */
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9
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10 #include <ctype.h>
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11 #include <stdio.h>
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12 #include <stdint.h>
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13 #include <stdlib.h>
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14 #include <string.h>
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15 #include <strings.h>
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16 #include <gsm.h>
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17
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18 static char *infname;
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19 static FILE *inf;
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20 static char linebuf[256];
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21 static int lineno;
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22
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23 static
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24 get_line()
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25 {
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26 if (!fgets(linebuf, sizeof linebuf, inf))
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27 return 0;
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28 lineno++;
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29 if (!index(linebuf, '\n')) {
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30 fprintf(stderr, "%s line %d: too long or missing newline\n",
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31 infname, lineno);
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32 exit(1);
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33 }
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34 return 1;
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35 }
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36
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37 static
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38 read_lar_params(params)
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39 gsm_signal *params;
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40 {
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41 char *cp;
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42 unsigned n;
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43
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44 for (;;) {
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45 if (!get_line())
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46 return 0;
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47 for (cp = linebuf; isspace(*cp); cp++)
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48 ;
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49 if (*cp)
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50 break;
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51 }
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52 if (*cp == '#') {
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53 cp++;
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54 if (!isdigit(*cp)) {
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55 inv_syntax: fprintf(stderr,
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56 "%s line %d: invalid syntax (expected LAR)\n",
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57 infname, lineno);
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58 exit(1);
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59 }
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60 while (isdigit(*cp))
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61 cp++;
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62 if (*cp++ != ':')
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63 goto inv_syntax;
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64 while (isspace(*cp))
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65 cp++;
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66 }
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67 if (cp[0] != 'F' || cp[1] != 'R' || !isspace(cp[2]))
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68 goto inv_syntax;
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69 cp += 3;
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70 for (n = 0; n < 8; n++) {
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71 while (isspace(*cp))
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72 cp++;
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73 if (!isdigit(*cp))
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74 goto inv_syntax;
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75 params[n] = strtoul(cp, &cp, 10);
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76 if (!isspace(*cp))
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77 goto inv_syntax;
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78 }
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79 fputs(linebuf, stdout);
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80 return 1;
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81 }
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82
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83 static void
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84 read_subframe_params(params)
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85 gsm_signal *params;
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86 {
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87 char *cp;
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88 unsigned n;
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89
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90 for (;;) {
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91 if (!get_line()) {
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92 fprintf(stderr,
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93 "%s bad: EOF in the middle of a frame\n",
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94 infname);
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95 exit(1);
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96 }
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97 for (cp = linebuf; isspace(*cp); cp++)
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98 ;
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99 if (*cp)
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100 break;
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101 }
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102 for (n = 0; n < 17; n++) {
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103 while (isspace(*cp))
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104 cp++;
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105 if (!isdigit(*cp)) {
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106 inv_syntax: fprintf(stderr,
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107 "%s line %d: invalid syntax (expected subframe)\n",
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108 infname, lineno);
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109 exit(1);
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110 }
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111 params[n] = strtoul(cp, &cp, 10);
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112 if (!isspace(*cp))
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113 goto inv_syntax;
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114 }
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115 fputs(linebuf, stdout);
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116 }
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117
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118 static
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119 read_frame(params)
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120 gsm_signal *params;
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121 {
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122 int rc;
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123 unsigned n, idx;
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124
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125 rc = read_lar_params(params);
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126 if (!rc)
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127 return 0;
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128 idx = 8;
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129 for (n = 0; n < 4; n++) {
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130 read_subframe_params(params + idx);
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131 idx += 17;
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132 }
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133 return 1;
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134 }
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135
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136 main(argc, argv)
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137 char **argv;
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138 {
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139 gsm dec_state;
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140 gsm_signal params[76];
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141 uint8_t frame[33];
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142 int16_t pcm[160];
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143 int rc, i;
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144 unsigned samp_abs, samp_max;
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145
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146 if (argc != 2) {
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147 fprintf(stderr, "usage: %s input-file\n", argv[0]);
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148 exit(1);
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149 }
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150 infname = argv[1];
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151 inf = fopen(infname, "r");
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152 if (!inf) {
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153 perror(infname);
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154 exit(1);
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155 }
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156 dec_state = gsm_create();
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157 if (!dec_state) {
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158 fprintf(stderr, "gsm_create() failed!\n");
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159 exit(1);
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160 }
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161 for (;;) {
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162 rc = read_frame(params);
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163 if (!rc)
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164 break;
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165 gsm_implode(dec_state, params, frame);
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166 gsm_decode(dec_state, frame, pcm);
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167 samp_max = 0;
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168 for (i = 0; i < 160; i++) {
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169 if (pcm[i] >= 0)
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170 samp_abs = pcm[i];
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171 else
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172 samp_abs = -pcm[i];
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173 if (samp_abs > samp_max)
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174 samp_max = samp_abs;
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175 }
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176 printf(" MAX=%u\n", samp_max);
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177 }
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178 exit(0);
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179 }