FreeCalypso > hg > gsm-net-reveng
annotate trau-decode/parse-efr.c @ 5:bf5c9fb431b8
trau-parse: implement EFR decoding
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 24 May 2024 09:34:36 +0000 |
parents | d9c095357c32 |
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rev | line source |
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1 /* |
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2 * This module implements the EFR decoding part of trau-parse. |
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3 */ |
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4 |
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5 #include <stdio.h> |
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6 #include <stdint.h> |
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7 #include <stdlib.h> |
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8 #include <string.h> |
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9 #include <strings.h> |
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10 #include <gsm_efr.h> |
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11 #include "osmo_bits.h" |
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12 |
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13 /* |
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14 * EFR TRAU parity |
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15 * |
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16 * g(x) = x^3 + x^1 + 1 |
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17 */ |
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18 static const struct osmo_crc8gen_code gsm0860_efr_crc3 = { |
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19 .bits = 3, |
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20 .poly = 0x3, |
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21 .init = 0x0, |
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22 .remainder = 0x7, |
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23 }; |
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24 |
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25 /* re-combine EFR parity bits */ |
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26 static inline void efr_parity_bits_1(ubit_t *check_bits, const ubit_t *d_bits) |
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27 { |
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28 memcpy(check_bits + 0 , d_bits + 0, 22); |
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29 memcpy(check_bits + 22 , d_bits + 24, 3); |
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30 check_bits[25] = d_bits[28]; |
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31 } |
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32 |
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33 static inline void efr_parity_bits_2(ubit_t *check_bits, const ubit_t *d_bits) |
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34 { |
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35 memcpy(check_bits + 0 , d_bits + 42, 10); |
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36 memcpy(check_bits + 10 , d_bits + 90, 2); |
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37 } |
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38 |
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39 static inline void efr_parity_bits_3(ubit_t *check_bits, const ubit_t *d_bits) |
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40 { |
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41 memcpy(check_bits + 0 , d_bits + 98, 5); |
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42 check_bits[5] = d_bits[104]; |
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43 memcpy(check_bits + 6 , d_bits + 143, 2); |
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44 } |
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45 |
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46 static inline void efr_parity_bits_4(ubit_t *check_bits, const ubit_t *d_bits) |
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47 { |
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48 memcpy(check_bits + 0 , d_bits + 151, 10); |
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49 memcpy(check_bits + 10 , d_bits + 199, 2); |
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50 } |
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51 |
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52 static inline void efr_parity_bits_5(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 + 207, 5); |
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55 check_bits[5] = d_bits[213]; |
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56 memcpy(check_bits + 6 , d_bits + 252, 2); |
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57 } |
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58 |
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59 void |
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60 check_efr_crc(d_bits) |
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61 ubit_t *d_bits; |
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62 { |
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63 ubit_t check_bits[26]; |
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64 int rc1, rc2, rc3, rc4, rc5; |
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65 |
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66 efr_parity_bits_1(check_bits, d_bits); |
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67 rc1 = osmo_crc8gen_check_bits(&gsm0860_efr_crc3, check_bits, 26, |
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68 d_bits + 39); |
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69 efr_parity_bits_2(check_bits, d_bits); |
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70 rc2 = osmo_crc8gen_check_bits(&gsm0860_efr_crc3, check_bits, 12, |
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71 d_bits + 95); |
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72 efr_parity_bits_3(check_bits, d_bits); |
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73 rc3 = osmo_crc8gen_check_bits(&gsm0860_efr_crc3, check_bits, 8, |
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74 d_bits + 148); |
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75 efr_parity_bits_4(check_bits, d_bits); |
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76 rc4 = osmo_crc8gen_check_bits(&gsm0860_efr_crc3, check_bits, 12, |
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77 d_bits + 204); |
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78 efr_parity_bits_5(check_bits, d_bits); |
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79 rc5 = osmo_crc8gen_check_bits(&gsm0860_efr_crc3, check_bits, 8, |
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80 d_bits + 257); |
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81 printf(" D1=%u CRC: %s %s %s %s %s\n", d_bits[0], |
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82 rc1 ? "bad" : "good", rc2 ? "bad" : "good", |
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83 rc3 ? "bad" : "good", rc4 ? "bad" : "good", |
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84 rc5 ? "bad" : "good"); |
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85 } |
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86 |
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87 static void |
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88 dbits_to_frame(d_bits, frame) |
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89 ubit_t *d_bits; |
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90 uint8_t *frame; |
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91 { |
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92 ubit_t intermed[248], *ip; |
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93 uint8_t *op, mask; |
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94 unsigned nb; |
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95 |
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96 intermed[0] = 1; |
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97 intermed[1] = 1; |
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98 intermed[2] = 0; |
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99 intermed[3] = 0; |
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100 bcopy(d_bits + 1, intermed + 4, 38); |
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101 bcopy(d_bits + 42, intermed + 42, 53); |
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102 bcopy(d_bits + 98, intermed + 95, 50); |
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103 bcopy(d_bits + 151, intermed + 145, 53); |
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104 bcopy(d_bits + 207, intermed + 198, 50); |
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105 ip = intermed; |
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106 op = frame; |
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107 for (nb = 0; nb < EFR_RTP_FRAME_LEN; nb++) { |
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108 *op = 0; |
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109 for (mask = 0x80; mask; mask >>= 1) { |
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110 if (*ip) |
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111 *op |= mask; |
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112 ip++; |
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113 } |
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114 op++; |
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115 } |
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116 } |
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117 |
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118 void |
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119 print_efr_frame(d_bits) |
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120 ubit_t *d_bits; |
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121 { |
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122 uint8_t frame[EFR_RTP_FRAME_LEN]; |
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123 int16_t params[EFR_NUM_PARAMS]; |
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124 int i, j, n, sid; |
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125 |
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126 dbits_to_frame(d_bits, frame); |
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127 EFR_frame2params(frame, params); |
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128 fputs(" EFR frame:\n LPC", stdout); |
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129 n = 0; |
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130 for (i = 0; i < 5; i++) |
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131 printf(" %d", params[n++]); |
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132 putchar('\n'); |
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133 for (i = 0; i < 4; i++) { |
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134 fputs(" ", stdout); |
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135 for (j = 0; j < 13; j++) |
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136 printf(" %d", params[n++]); |
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137 putchar('\n'); |
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138 } |
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139 sid = EFR_sid_classify(frame); |
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140 printf(" SID recompute: %d\n", sid); |
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141 if (!bcmp(frame, EFR_decoder_homing_frame, EFR_RTP_FRAME_LEN)) |
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142 puts(" Matches DHF"); |
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143 } |