FreeCalypso > hg > gsm-codec-lib

annotate frtest/dlcap-gsmx.c @ 297:6b479cfb06a4

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beginning of libgsmfr2 documentation
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 15 Apr 2024 07:12:31 +0000
parents 6e39fc0134da
children
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1 /*
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2 * This program reads a TCH/FS downlink capture produced with FreeCalypso tools
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3 * (fw version with TCH downlink sniffing feature and fc-shell tch record)
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4 * and converts it into our extended-libgsm binary format, to be further
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5 * fed to gsmfr-decode.
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6 */
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7
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8 #include <ctype.h>
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9 #include <stdio.h>
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10 #include <stdint.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <strings.h>
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15 main(argc, argv)
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16 char **argv;
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17 {
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18 FILE *inf, *outf;
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19 char linebuf[128];
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20 int lineno, rc;
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21 uint16_t status_words[3];
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22 uint8_t tidsp_bytes[33], libgsm_bytes[33], bfi[2];
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23 unsigned fn_mod_104;
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25 if (argc != 3) {
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26 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
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27 exit(1);
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28 }
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29 inf = fopen(argv[1], "r");
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30 if (!inf) {
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31 perror(argv[1]);
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32 exit(1);
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33 }
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34 outf = fopen(argv[2], "w");
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35 if (!outf) {
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36 perror(argv[2]);
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37 exit(1);
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38 }
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39 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
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40 /* support both old and new formats */
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41 if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) &&
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42 isxdigit(linebuf[2]) && isxdigit(linebuf[3])) {
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43 rc = parse_dlcap_common(linebuf, status_words,
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44 tidsp_bytes);
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45 if (rc < 0) {
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46 invalid: fprintf(stderr,
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47 "error: %s is not in the expected format\n",
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48 argv[1]);
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49 exit(1);
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50 }
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51 fn_mod_104 = 0; /* won't have TAF */
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52 } else if (!strncmp(linebuf, "FR ", 3)) {
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53 rc = parse_dlcap_common(linebuf + 3, status_words,
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54 tidsp_bytes);
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55 if (rc < 0)
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56 goto invalid;
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57 if (linebuf[84] != ' ')
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58 goto invalid;
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59 if (!isdigit(linebuf[85]))
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60 goto invalid;
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61 fn_mod_104 = strtoul(linebuf + 85, 0, 10);
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62 } else
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63 goto invalid;
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64 /*
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65 * DSP flags are documented in the TCH-tap-modes article
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66 * in freecalypso-docs.
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67 */
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68 if ((status_words[0] & 0xC004) == 0xC000) {
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69 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes);
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70 fwrite(libgsm_bytes, 1, 33, outf);
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71 } else {
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72 bfi[0] = 0xBF;
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73 bfi[1] = fn_mod_104 == 60;
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74 fwrite(bfi, 1, 2, outf);
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75 }
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76 }
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77 exit(0);
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78 }