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annotate efrtest/etsi-dec.c @ 122:b33f2168fdec

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doc/EFR-rationale article written
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 10 Dec 2022 08:51:01 +0000
parents e5ee684c6d29
children 8ed838709897
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9cf1355bc071 gsmefr-etsi-dec test program written
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * gsmefr-etsi-dec is a test program for our EFR decoder: it reads ETSI's
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3 * .dec format as input and writes raw 16-bit PCM (same as ETSI's *.out)
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4 * as output, allowing our decoder to be tested with ETSI's official test
9cf1355bc071 gsmefr-etsi-dec test program written
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5 * sequences.
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6 *
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7 * ETSI input and output files are read and written in LE byte order,
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8 * matching the official test sequences in ts_100725v050200p0.zip.
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9 */
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10
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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 "../libgsmefr/gsm_efr.h"
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17
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18 #define ETSI_DEC_NWORDS 247
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19
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20 static int
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21 read_input(inf, bitvec, filename_for_errs)
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22 FILE *inf;
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23 uint8_t *bitvec;
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24 char *filename_for_errs;
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25 {
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26 uint8_t file_bytes[ETSI_DEC_NWORDS * 2], *sp;
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27 int cc;
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28 unsigned n;
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29
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30 cc = fread(file_bytes, 2, ETSI_DEC_NWORDS, inf);
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31 if (cc == 0)
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32 return 0;
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33 if (cc != ETSI_DEC_NWORDS) {
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34 fprintf(stderr, "error: short read from %s\n",
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35 filename_for_errs);
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36 exit(1);
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37 }
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38 sp = file_bytes;
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39 for (n = 0; n < ETSI_DEC_NWORDS; n++) {
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40 if (sp[1]) {
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41 fprintf(stderr,
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42 "error in %s: non-zero in what should be LE upper byte\n",
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43 filename_for_errs);
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44 exit(1);
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45 }
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46 bitvec[n] = sp[0];
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47 sp += 2;
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48 }
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49 return 1;
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50 }
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51
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52 static void
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53 bits2frame(input_bits, frame, filename_for_errs, frame_no)
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54 uint8_t *input_bits, *frame;
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55 char *filename_for_errs;
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56 unsigned frame_no;
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57 {
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58 uint8_t bits[248], *sp, *dp;
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59 unsigned nb, byte, mask;
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60
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61 bits[0] = 1;
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62 bits[1] = 1;
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63 bits[2] = 0;
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64 bits[3] = 0;
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65 bcopy(input_bits, bits + 4, 244);
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66 sp = bits;
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67 dp = frame;
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68 for (nb = 0; nb < EFR_RTP_FRAME_LEN; nb++) {
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69 byte = 0;
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70 for (mask = 0x80; mask; mask >>= 1) {
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71 if (*sp > 1) {
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72 fprintf(stderr,
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73 "error in %s frame #%u: data bit > 1\n",
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74 filename_for_errs, frame_no);
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75 exit(1);
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76 }
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77 if (*sp)
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78 byte |= mask;
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79 sp++;
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80 }
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81 *dp++ = byte;
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82 }
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83 }
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84
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85 static void
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86 write_pcm_le(outf, pcm)
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87 FILE *outf;
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88 int16_t *pcm;
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89 {
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90 uint8_t bytes[320], *dp;
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91 int16_t samp;
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92 unsigned n;
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93
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94 dp = bytes;
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95 for (n = 0; n < 160; n++) {
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96 samp = pcm[n];
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97 *dp++ = samp & 0xFF;
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98 *dp++ = (samp >> 8) & 0xFF;
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99 }
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100 fwrite(bytes, 2, 160, outf);
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101 }
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102
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103 main(argc, argv)
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104 char **argv;
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105 {
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106 FILE *inf, *outf;
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107 struct EFR_decoder_state *state;
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108 unsigned frame_no;
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109 uint8_t input_bits[ETSI_DEC_NWORDS], frame[EFR_RTP_FRAME_LEN];
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110 int16_t pcm[160];
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111 int rc;
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112
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113 if (argc != 3) {
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114 fprintf(stderr, "usage: %s input.dec output.out\n", argv[0]);
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115 exit(1);
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116 }
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117 inf = fopen(argv[1], "r");
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118 if (!inf) {
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119 perror(argv[1]);
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120 exit(1);
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121 }
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122 outf = fopen(argv[2], "w");
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123 if (!outf) {
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124 perror(argv[2]);
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125 exit(1);
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126 }
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127 state = EFR_decoder_create();
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128 if (!state) {
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129 perror("EFR_decoder_create()");
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130 exit(1);
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131 }
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132 for (frame_no = 0; ; frame_no++) {
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133 rc = read_input(inf, input_bits, argv[1]);
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134 if (!rc)
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135 break;
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136 if (input_bits[0] > 1) {
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137 fprintf(stderr, "error in %s frame #%u: BFI > 1\n",
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138 argv[1], frame_no);
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139 exit(1);
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140 }
97
e5ee684c6d29 efrtest/etsi-dec.c: off-by-1 error in frame bit packing
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141 bits2frame(input_bits + 1, frame, argv[1], frame_no);
96
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142 if (input_bits[245] > 2) {
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143 fprintf(stderr, "error in %s frame #%u: SID > 2\n",
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144 argv[1], frame_no);
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145 exit(1);
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146 }
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147 if (input_bits[246] > 1) {
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148 fprintf(stderr, "error in %s frame #%u: TAF > 1\n",
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149 argv[1], frame_no);
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150 exit(1);
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151 }
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152 rc = EFR_sid_classify(frame);
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153 if (input_bits[245] != rc) {
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154 fprintf(stderr,
9cf1355bc071 gsmefr-etsi-dec test program written
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155 "warning: frame #%u has mismatching SID (file says %u, analysis yields %d)\n",
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156 frame_no, input_bits[245], rc);
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157 }
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158 EFR_decode_frame(state, frame, input_bits[0], input_bits[246],
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159 pcm);
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160 write_pcm_le(outf, pcm);
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161 }
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162 fclose(outf);
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163 exit(0);
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164 }