FreeCalypso > hg > freecalypso-tools

annotate tchtools/fc-tch2fr.c @ 947:1f2459a776d7

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doc/TCH-bit-access: point to gsm-codec-lib release tarball URL
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 06 Jun 2023 04:37:54 +0000
parents a7ad6b39e01b
children
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d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
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1 /*
903
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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2 * This program reads TCH downlink capture files in the old format from 2016
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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3 * (the format which fc-shell tch record will write if the firmware running
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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4 * on the Calypso GSM device is an old version that emits TCH DL bits in
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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5 * the old format from 2016), completely *disregards* all 3 status words
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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6 * including the essential word of control flags, converts the 260-bit
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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7 * payload portion of each frame into standard libgsm/RTP format, and
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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8 * writes the result into a .gsm binary file.
6
d57f68d0568d fc-tch2fr utility written, added under miscutil
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9 *
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Mychaela Falconia <falcon@freecalypso.org>
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10 * This program was written in 2016, at that time we (FreeCalypso team)
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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11 * did not have a proper understanding of how the complete TCH DL processing
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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12 * chain works - we particularly missed the Rx DTX handler block that MUST
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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13 * be present between the output of the GSM 05.03 channel decoder and the
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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14 * input to the GSM 06.10 speech decoder - and therefore the function
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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15 * performed by this program is a bogo-transform.
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d57f68d0568d fc-tch2fr utility written, added under miscutil
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16 *
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Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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17 * This bogo-transform program is kept as part of FC host tools package
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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18 * only for backward compatibility - for actual decoding of TCH DL captures,
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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19 * please use our new gsmfr-dlcap-* and gsmefr-dlcap-* utilities that are
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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20 * maintained as part of Themyscira Wireless GSM codec libraries & utilities
a7ad6b39e01b tchtools/fc-tch2fr.c: update big header comment for new reality
Mychaela Falconia <falcon@freecalypso.org>
parents: 902
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21 * package.
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d57f68d0568d fc-tch2fr utility written, added under miscutil
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22 */
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23
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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24 #include <sys/types.h>
d57f68d0568d fc-tch2fr utility written, added under miscutil
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25 #include <ctype.h>
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26 #include <stdio.h>
d57f68d0568d fc-tch2fr utility written, added under miscutil
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27 #include <stdlib.h>
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28
d57f68d0568d fc-tch2fr utility written, added under miscutil
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29 static
d57f68d0568d fc-tch2fr utility written, added under miscutil
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30 decode_hex_digit(ch)
d57f68d0568d fc-tch2fr utility written, added under miscutil
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31 {
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32 if (isdigit(ch))
d57f68d0568d fc-tch2fr utility written, added under miscutil
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33 return(ch - '0');
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34 else if (isupper(ch))
d57f68d0568d fc-tch2fr utility written, added under miscutil
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35 return(ch - 'A' + 10);
d57f68d0568d fc-tch2fr utility written, added under miscutil
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36 else
d57f68d0568d fc-tch2fr utility written, added under miscutil
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37 return(ch - 'a' + 10);
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38 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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39
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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40 main(argc, argv)
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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41 char **argv;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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42 {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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43 FILE *inf, *outf;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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44 char linebuf[128];
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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45 int lineno;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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46 char *cp;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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47 int i, j;
d57f68d0568d fc-tch2fr utility written, added under miscutil
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48 u_char tidsp_bytes[33], libgsm_bytes[33];
d57f68d0568d fc-tch2fr utility written, added under miscutil
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49
d57f68d0568d fc-tch2fr utility written, added under miscutil
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50 if (argc != 3) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
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51 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
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52 exit(1);
d57f68d0568d fc-tch2fr utility written, added under miscutil
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53 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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54 inf = fopen(argv[1], "r");
d57f68d0568d fc-tch2fr utility written, added under miscutil
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55 if (!inf) {
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56 perror(argv[1]);
d57f68d0568d fc-tch2fr utility written, added under miscutil
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57 exit(1);
d57f68d0568d fc-tch2fr utility written, added under miscutil
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58 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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59 outf = fopen(argv[2], "w");
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60 if (!outf) {
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61 perror(argv[2]);
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62 exit(1);
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63 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
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64 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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65 /* skip DSP status words */
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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66 cp = linebuf;
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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67 for (i = 0; i < 3; i++) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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68 for (j = 0; j < 4; j++) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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69 if (!isxdigit(*cp++)) {
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70 invalid: fprintf(stderr,
d57f68d0568d fc-tch2fr utility written, added under miscutil
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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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Mychaela Falconia <falcon@freecalypso.org>
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75 }
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76 if (*cp++ != ' ')
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77 goto invalid;
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78 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
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79 /* read the frame bits */
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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80 for (i = 0; i < 33; i++) {
d57f68d0568d fc-tch2fr utility written, added under miscutil
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81 if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
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82 goto invalid;
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Mychaela Falconia <falcon@freecalypso.org>
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83 tidsp_bytes[i] = (decode_hex_digit(cp[0]) << 4) |
d57f68d0568d fc-tch2fr utility written, added under miscutil
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84 decode_hex_digit(cp[1]);
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Mychaela Falconia <falcon@freecalypso.org>
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85 cp += 2;
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86 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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87 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes);
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Mychaela Falconia <falcon@freecalypso.org>
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88 fwrite(libgsm_bytes, 1, 33, outf);
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Mychaela Falconia <falcon@freecalypso.org>
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89 }
d57f68d0568d fc-tch2fr utility written, added under miscutil
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90 exit(0);
d57f68d0568d fc-tch2fr utility written, added under miscutil
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91 }