annotate efrtest/dlcap-sync.c @ 510:5bf71b091323

libgsmhr1: add direct conversion from RTP input to decoder params
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 25 Aug 2024 02:19:37 +0000
parents d80ccb3c3970
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
468
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1 /*
4104b0390fab efrtest: new program gsmefr-dlcap-sync
Mychaela Falconia <falcon@freecalypso.org>
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2 * This program reads a TCH/EFS downlink capture file from a FreeCalypso GSM MS
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Mychaela Falconia <falcon@freecalypso.org>
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3 * that was produced in a session in which seqsync PCMA or PCMU input was fed
4104b0390fab efrtest: new program gsmefr-dlcap-sync
Mychaela Falconia <falcon@freecalypso.org>
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4 * into the test call from IP-PSTN side. It looks for EFR DHF followed by
4104b0390fab efrtest: new program gsmefr-dlcap-sync
Mychaela Falconia <falcon@freecalypso.org>
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5 * specific frame patterns indicating how the seqsync input was transcoded
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Mychaela Falconia <falcon@freecalypso.org>
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6 * by the alien GSM network, and reports its findings.
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Mychaela Falconia <falcon@freecalypso.org>
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7 */
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8
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9 #include <ctype.h>
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14 #include <strings.h>
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d80ccb3c3970 gsmefr-dlcap-sync: use DHF datum in the library
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15 #include "../libgsmefr/gsm_efr.h"
468
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16
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Mychaela Falconia <falcon@freecalypso.org>
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17 static const uint8_t mr122_dhf[31] = {
4104b0390fab efrtest: new program gsmefr-dlcap-sync
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18 0xC0,0x85,0x4D,0xB9,0x6A,0xAA,0xD6,0x00,0x00,0x00,0x00,0x01,0xB5,0x87,0xF6,0x68,
4104b0390fab efrtest: new program gsmefr-dlcap-sync
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19 0x37,0x94,0x09,0x00,0x41,0x58,0x54,0xF1,0x0F,0x6B,0x02,0x40,0x3C,0x7E,0xA0,
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20 };
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21
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22 extern const uint8_t sync_from_pcma[320*31];
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23 extern const uint8_t sync_from_pcmu[320*31];
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24
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25 static int
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26 check_for_match(input, table)
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27 const uint8_t *input, *table;
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28 {
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29 unsigned n;
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30
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31 for (n = 0; n < 320; n++) {
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Mychaela Falconia <falcon@freecalypso.org>
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32 if (!bcmp(input, table + n * 31, 31))
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33 return n;
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34 }
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35 return -1;
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36 }
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37
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38 main(argc, argv)
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39 char **argv;
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40 {
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Mychaela Falconia <falcon@freecalypso.org>
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41 FILE *inf;
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42 char linebuf[128];
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Mychaela Falconia <falcon@freecalypso.org>
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43 int lineno, rc;
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Mychaela Falconia <falcon@freecalypso.org>
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44 uint16_t status_words[3];
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Mychaela Falconia <falcon@freecalypso.org>
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45 uint8_t tidsp_bytes[33], efr_bytes[31];
4104b0390fab efrtest: new program gsmefr-dlcap-sync
Mychaela Falconia <falcon@freecalypso.org>
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46 const uint8_t *match_table;
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Mychaela Falconia <falcon@freecalypso.org>
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47 int dhf_state;
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Mychaela Falconia <falcon@freecalypso.org>
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48 char *dhf_name;
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49
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50 if (argc != 3) {
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Mychaela Falconia <falcon@freecalypso.org>
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51 usage: fprintf(stderr, "usage: %s dlcap-file alaw|ulaw\n", argv[0]);
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52 exit(1);
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53 }
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54 inf = fopen(argv[1], "r");
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Mychaela Falconia <falcon@freecalypso.org>
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55 if (!inf) {
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56 perror(argv[1]);
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57 exit(1);
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58 }
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59 if (!strcmp(argv[2], "alaw"))
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60 match_table = sync_from_pcma;
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61 else if (!strcmp(argv[2], "ulaw"))
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62 match_table = sync_from_pcmu;
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63 else
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64 goto usage;
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65 dhf_state = 0;
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66 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
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67 /* support both old and new formats */
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68 if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) &&
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69 isxdigit(linebuf[2]) && isxdigit(linebuf[3])) {
4104b0390fab efrtest: new program gsmefr-dlcap-sync
Mychaela Falconia <falcon@freecalypso.org>
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70 rc = parse_dlcap_common(linebuf, status_words,
4104b0390fab efrtest: new program gsmefr-dlcap-sync
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71 tidsp_bytes);
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72 if (rc < 0) {
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73 invalid: fprintf(stderr,
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74 "error: %s is not in the expected format\n",
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75 argv[1]);
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76 exit(1);
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77 }
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78 } else if (!strncmp(linebuf, "EFR ", 4)) {
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79 rc = parse_dlcap_common(linebuf + 4, status_words,
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80 tidsp_bytes);
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81 if (rc < 0)
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82 goto invalid;
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83 if (linebuf[85] != ' ')
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84 goto invalid;
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85 if (!isdigit(linebuf[86]))
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86 goto invalid;
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87 } else
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88 goto invalid;
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89 if ((status_words[0] & 0xC204) != 0xC000) {
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90 dhf_state = 0;
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91 continue;
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92 }
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Mychaela Falconia <falcon@freecalypso.org>
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93 efr_tidsp_to_std(tidsp_bytes, efr_bytes);
472
d80ccb3c3970 gsmefr-dlcap-sync: use DHF datum in the library
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94 if (!bcmp(efr_bytes, EFR_decoder_homing_frame, 31)) {
468
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Mychaela Falconia <falcon@freecalypso.org>
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95 dhf_state = 1;
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96 continue;
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97 }
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98 if (!bcmp(efr_bytes, mr122_dhf, 31)) {
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Mychaela Falconia <falcon@freecalypso.org>
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99 dhf_state = 2;
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100 continue;
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101 }
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Mychaela Falconia <falcon@freecalypso.org>
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102 if (!dhf_state)
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Mychaela Falconia <falcon@freecalypso.org>
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103 continue;
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Mychaela Falconia <falcon@freecalypso.org>
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104 rc = check_for_match(efr_bytes, match_table);
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Mychaela Falconia <falcon@freecalypso.org>
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105 if (rc >= 0 && rc <= 159) {
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Mychaela Falconia <falcon@freecalypso.org>
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106 printf(
4104b0390fab efrtest: new program gsmefr-dlcap-sync
Mychaela Falconia <falcon@freecalypso.org>
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107 "line %d: match to standard EFR with offset %d\n",
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108 lineno, rc);
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109 if (dhf_state == 2)
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Mychaela Falconia <falcon@freecalypso.org>
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110 printf("... but preceded by MR122 DHF!\n");
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111 } else if (rc >= 160 && rc <= 279) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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112 printf("line %d: match to AMR-EFR with offset %d\n",
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Mychaela Falconia <falcon@freecalypso.org>
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113 lineno, rc - 160);
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114 if (dhf_state == 2)
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115 printf("... but preceded by MR122 DHF!\n");
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116 } else if (rc >= 280 && rc <= 319) {
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117 printf("line %d: match to AMR-EFR with offset %d\n",
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Mychaela Falconia <falcon@freecalypso.org>
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118 lineno, rc - 160);
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Mychaela Falconia <falcon@freecalypso.org>
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119 switch (dhf_state) {
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Mychaela Falconia <falcon@freecalypso.org>
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120 case 1:
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Mychaela Falconia <falcon@freecalypso.org>
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121 dhf_name = "EFR";
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Mychaela Falconia <falcon@freecalypso.org>
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122 break;
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Mychaela Falconia <falcon@freecalypso.org>
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123 case 2:
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Mychaela Falconia <falcon@freecalypso.org>
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124 dhf_name = "MR122";
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Mychaela Falconia <falcon@freecalypso.org>
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125 break;
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Mychaela Falconia <falcon@freecalypso.org>
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126 default:
4104b0390fab efrtest: new program gsmefr-dlcap-sync
Mychaela Falconia <falcon@freecalypso.org>
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127 dhf_name = "???";
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128 }
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129 printf("previous frame was %s DHF\n", dhf_name);
4104b0390fab efrtest: new program gsmefr-dlcap-sync
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130 }
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131 dhf_state = 0;
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132 }
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133 exit(0);
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134 }