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annotate trau-decode/parse-efr.c @ 36:d9553c7ac6ea

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doc/TFO-xform/EFR: beginning of article
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Sep 2024 07:08:24 +0000
parents bf5c9fb431b8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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4
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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 }
5
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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 }