FreeCalypso > hg > gsm-codec-lib

annotate frtest/dlcap-sync.c @ 585:3c6bf0d26ee7

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +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 }