FreeCalypso > hg > ice1-trau-tester

annotate ater/out_frame.c @ 22:bacc590ec839

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ater: implement EFR CRC inversion option
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 24 Jun 2024 09:28:28 +0000
parents 2ee910aa03c3
children
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21
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1 /*
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2 * Here we implement our TRAU-UL bit filling function.
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3 *
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4 * This code is based on trau_rtp_conv.c in libosmo-abis.
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5 */
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6
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7 #include <stdint.h>
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8 #include <stdbool.h>
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9 #include <string.h>
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10
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11 #include <osmocom/core/bits.h>
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12 #include <osmocom/core/crc8gen.h>
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13 #include <osmocom/trau/trau_frame.h>
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14
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15 #include "out_frame.h"
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16
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17 /* this corresponds to the bit-lengths of the individual codec
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18 * parameters as indicated in Table 1.1 of TS 46.010 */
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19 static const uint8_t gsm_fr_map[] = {
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20 6, 6, 5, 5, 4, 4, 3, 3,
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21 7, 2, 2, 6, 3, 3, 3, 3,
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22 3, 3, 3, 3, 3, 3, 3, 3,
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23 3, 7, 2, 2, 6, 3, 3, 3,
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24 3, 3, 3, 3, 3, 3, 3, 3,
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25 3, 3, 7, 2, 2, 6, 3, 3,
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26 3, 3, 3, 3, 3, 3, 3, 3,
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27 3, 3, 3, 7, 2, 2, 6, 3,
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28 3, 3, 3, 3, 3, 3, 3, 3,
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29 3, 3, 3, 3
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30 };
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31
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32 /*
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33 * EFR TRAU parity
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34 *
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35 * g(x) = x^3 + x^1 + 1
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36 */
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37 static const struct osmo_crc8gen_code gsm0860_efr_crc3 = {
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38 .bits = 3,
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39 .poly = 0x3,
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40 .init = 0x0,
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41 .remainder = 0x7,
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42 };
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43
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44 /* re-combine EFR parity bits */
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45 static inline void efr_parity_bits_1(ubit_t *check_bits, const ubit_t *d_bits)
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46 {
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47 memcpy(check_bits + 0 , d_bits + 0, 22);
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48 memcpy(check_bits + 22 , d_bits + 24, 3);
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49 check_bits[25] = d_bits[28];
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50 }
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51
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52 static inline void efr_parity_bits_2(ubit_t *check_bits, const ubit_t *d_bits)
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53 {
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54 memcpy(check_bits + 0 , d_bits + 42, 10);
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55 memcpy(check_bits + 10 , d_bits + 90, 2);
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56 }
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57
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58 static inline void efr_parity_bits_3(ubit_t *check_bits, const ubit_t *d_bits)
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59 {
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60 memcpy(check_bits + 0 , d_bits + 98, 5);
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61 check_bits[5] = d_bits[104];
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62 memcpy(check_bits + 6 , d_bits + 143, 2);
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63 }
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64
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65 static inline void efr_parity_bits_4(ubit_t *check_bits, const ubit_t *d_bits)
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66 {
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67 memcpy(check_bits + 0 , d_bits + 151, 10);
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68 memcpy(check_bits + 10 , d_bits + 199, 2);
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69 }
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70
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71 static inline void efr_parity_bits_5(ubit_t *check_bits, const ubit_t *d_bits)
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72 {
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73 memcpy(check_bits + 0 , d_bits + 207, 5);
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74 check_bits[5] = d_bits[213];
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75 memcpy(check_bits + 6 , d_bits + 252, 2);
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76 }
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77
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78 static void fill_data_fr(const uint8_t *data, struct osmo_trau_frame *tf)
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79 {
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80 int i, j, k, l, o;
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81
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82 /* reassemble d-bits */
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83 i = 0; /* counts bits */
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84 j = 4; /* counts input bits */
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85 k = gsm_fr_map[0]-1; /* current number bit in element */
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86 l = 0; /* counts element bits */
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87 o = 0; /* offset output bits */
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88 while (i < 260) {
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89 tf->d_bits[k+o] = (data[j/8] >> (7-(j%8))) & 1;
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90 /* to avoid out-of-bounds access in gsm_fr_map[++l] */
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91 if (i == 259)
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92 break;
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93 if (--k < 0) {
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94 o += gsm_fr_map[l];
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95 k = gsm_fr_map[++l]-1;
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96 }
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97 i++;
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98 j++;
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99 }
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100 }
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101
22
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102 static void invert_crc3(ubit_t *crc)
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103 {
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104 crc[0] = !crc[0];
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105 crc[1] = !crc[1];
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106 crc[2] = !crc[2];
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107 }
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108
21
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109 static void fill_data_efr(const uint8_t *data, struct osmo_trau_frame *tf)
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110 {
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111 int i, j;
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112 ubit_t check_bits[26];
22
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113 uint8_t crc_inv;
21
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114
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115 /* reassemble d-bits */
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116 tf->d_bits[0] = 1;
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117 for (i = 1, j = 4; i < 39; i++, j++)
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118 tf->d_bits[i] = (data[j/8] >> (7-(j%8))) & 1;
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119 efr_parity_bits_1(check_bits, tf->d_bits);
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120 osmo_crc8gen_set_bits(&gsm0860_efr_crc3, check_bits, 26,
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121 tf->d_bits + 39);
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122 for (i = 42, j = 42; i < 95; i++, j++)
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123 tf->d_bits[i] = (data[j/8] >> (7-(j%8))) & 1;
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124 efr_parity_bits_2(check_bits, tf->d_bits);
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125 osmo_crc8gen_set_bits(&gsm0860_efr_crc3, check_bits, 12,
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126 tf->d_bits + 95);
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127 for (i = 98, j = 95; i < 148; i++, j++)
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128 tf->d_bits[i] = (data[j/8] >> (7-(j%8))) & 1;
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129 efr_parity_bits_3(check_bits, tf->d_bits);
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130 osmo_crc8gen_set_bits(&gsm0860_efr_crc3, check_bits, 8,
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131 tf->d_bits + 148);
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132 for (i = 151, j = 145; i < 204; i++, j++)
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133 tf->d_bits[i] = (data[j/8] >> (7-(j%8))) & 1;
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134 efr_parity_bits_4(check_bits, tf->d_bits);
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135 osmo_crc8gen_set_bits(&gsm0860_efr_crc3, check_bits, 12,
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136 tf->d_bits + 204);
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137 for (i = 207, j = 198; i < 257; i++, j++)
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138 tf->d_bits[i] = (data[j/8] >> (7-(j%8))) & 1;
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139 efr_parity_bits_5(check_bits, tf->d_bits);
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140 osmo_crc8gen_set_bits(&gsm0860_efr_crc3, check_bits, 8,
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141 tf->d_bits + 257);
22
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142
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143 /* inverted CRC option */
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144 crc_inv = data[31];
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145 if (crc_inv & 0x80)
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146 invert_crc3(tf->d_bits + 39);
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147 if (crc_inv & 0x40)
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148 invert_crc3(tf->d_bits + 95);
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149 if (crc_inv & 0x20)
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150 invert_crc3(tf->d_bits + 148);
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151 if (crc_inv & 0x10)
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152 invert_crc3(tf->d_bits + 204);
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153 if (crc_inv & 0x08)
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154 invert_crc3(tf->d_bits + 257);
21
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155 }
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156
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157 void trau_frame_from_record(const uint8_t *rec, bool is_efr,
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158 struct osmo_trau_frame *tf)
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159 {
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160 if (is_efr)
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161 fill_data_efr(rec, tf);
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162 else
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163 fill_data_fr(rec, tf);
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164 /* set BFI and SID flags */
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165 tf->c_bits[11] = (rec[33] & 0x80) >> 7;
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166 tf->c_bits[12] = (rec[33] & 0x02) >> 1;
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167 tf->c_bits[13] = (rec[33] & 0x01) >> 0;
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168 }