FreeCalypso > hg > gsm-codec-lib

annotate frtest/dlcap-sync.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 285381a001fc
children
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1 /*
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2 * This program reads a TCH/FS downlink capture file from a FreeCalypso GSM MS
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3 * that was produced in a session in which seqsync PCMA or PCMU input
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4 * (seqsyn_[au].inp) was fed into the test call from IP-PSTN side. It looks
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5 * for FRv1 DHF followed by specific frame patterns given by ETSI in
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6 * syn???_[au].cod files, and reports what it finds. Matches indicate
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7 * a particular alignment between the input sequence and encoder frame
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8 * boundaries, if the network speech transcoder implements the encoder
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9 * homing feature which is optional for FRv1.
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10 */
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11
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12 #include <ctype.h>
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13 #include <stdio.h>
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14 #include <stdint.h>
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15 #include <stdlib.h>
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16 #include <string.h>
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17 #include <strings.h>
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18 #include "../libgsmfr2/tw_gsmfr.h"
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19
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20 extern const uint8_t sync_from_pcma[160*33];
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21 extern const uint8_t sync_from_pcmu[160*33];
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22
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23 static int
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24 check_for_match(input, table)
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25 const uint8_t *input, *table;
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26 {
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27 unsigned n;
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28
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29 for (n = 0; n < 160; n++) {
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30 if (!bcmp(input, table + n * 33, 33))
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31 return n;
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32 }
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33 return -1;
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34 }
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35
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36 main(argc, argv)
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37 char **argv;
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38 {
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39 FILE *inf;
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40 char linebuf[128];
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41 int lineno, rc;
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42 uint16_t status_words[3];
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43 uint8_t tidsp_bytes[33], libgsm_bytes[33];
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44 const uint8_t *match_table;
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45 int dhf_state;
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46
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47 if (argc != 3) {
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48 usage: fprintf(stderr, "usage: %s dlcap-file alaw|ulaw\n", argv[0]);
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49 exit(1);
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50 }
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51 inf = fopen(argv[1], "r");
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52 if (!inf) {
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53 perror(argv[1]);
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54 exit(1);
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55 }
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56 if (!strcmp(argv[2], "alaw"))
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57 match_table = sync_from_pcma;
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58 else if (!strcmp(argv[2], "ulaw"))
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59 match_table = sync_from_pcmu;
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60 else
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61 goto usage;
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62 dhf_state = 0;
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63 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
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64 /* support both old and new formats */
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65 if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) &&
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66 isxdigit(linebuf[2]) && isxdigit(linebuf[3])) {
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67 rc = parse_dlcap_common(linebuf, status_words,
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68 tidsp_bytes);
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69 if (rc < 0) {
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70 invalid: fprintf(stderr,
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71 "error: %s is not in the expected format\n",
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72 argv[1]);
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73 exit(1);
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74 }
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75 } else if (!strncmp(linebuf, "FR ", 3)) {
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76 rc = parse_dlcap_common(linebuf + 3, status_words,
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77 tidsp_bytes);
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78 if (rc < 0)
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79 goto invalid;
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80 if (linebuf[84] != ' ')
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81 goto invalid;
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82 if (!isdigit(linebuf[85]))
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83 goto invalid;
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84 } else
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85 goto invalid;
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86 if ((status_words[0] & 0xC004) != 0xC000) {
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87 dhf_state = 0;
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88 continue;
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89 }
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90 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes);
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91 if (!bcmp(libgsm_bytes, gsmfr_decoder_homing_frame, 33)) {
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92 dhf_state = 1;
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93 continue;
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94 }
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95 if (!dhf_state)
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96 continue;
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97 rc = check_for_match(libgsm_bytes, match_table);
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98 if (rc >= 0 && rc <= 159) {
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99 printf(
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100 "line %d: match to expected sync frame for offset %d\n",
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101 lineno, rc);
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102 }
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103 dhf_state = 0;
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104 }
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105 exit(0);
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106 }