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annotate miscutil/fc-fr2tch.c @ 737:6d97866bad79

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first round of documentation for DUART28C boot control addition
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 16 Sep 2020 06:10:39 +0000
parents 7eaa3307e5df
children
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5
7eaa3307e5df fc-fr2tch utility written, added under miscutil
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1 /*
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2 * This utility converts a GSM 06.10 speech recording from the format that is
7eaa3307e5df fc-fr2tch utility written, added under miscutil
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3 * commonly accepted as standard in the Unix/Linux world (libgsm format) into
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4 * hex strings of TCH bits to be fed to the GSM 05.03 channel encoder by way
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5 * of a TI Calypso GSM device, a FreeCalypso GSM firmware version with the
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6 * TCH rerouting feature, and fc-shell's tch play command.
7eaa3307e5df fc-fr2tch utility written, added under miscutil
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7 */
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8
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9 #include <sys/types.h>
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12
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13 main(argc, argv)
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14 char **argv;
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15 {
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16 FILE *inf, *outf;
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17 u_char libgsm_bytes[33], tidsp_bytes[33];
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18 int cc, i, gotsome = 0;
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19
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20 if (argc != 3) {
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21 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
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22 exit(1);
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23 }
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24 inf = fopen(argv[1], "r");
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25 if (!inf) {
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26 perror(argv[1]);
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27 exit(1);
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28 }
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29 outf = fopen(argv[2], "w");
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30 if (!outf) {
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31 perror(argv[2]);
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32 exit(1);
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33 }
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34 for (;;) {
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35 cc = fread(libgsm_bytes, 1, 33, inf);
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36 if (cc < 33)
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37 break;
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38 if ((libgsm_bytes[0] & 0xF0) != 0xD0) {
7eaa3307e5df fc-fr2tch utility written, added under miscutil
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39 invalid: fprintf(stderr, "error: %s is not in libgsm format\n",
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40 argv[1]);
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41 exit(1);
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42 }
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43 gsm0610_libgsm_to_tidsp(libgsm_bytes, tidsp_bytes);
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44 for (i = 0; i < 33; i++)
7eaa3307e5df fc-fr2tch utility written, added under miscutil
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45 fprintf(outf, "%02X", tidsp_bytes[i]);
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46 putc('\n', outf);
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47 gotsome = 1;
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48 }
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49 fclose(outf);
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50 if (cc) {
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51 if (gotsome)
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52 fprintf(stderr,
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53 "warning: extra non-33 bytes at the end of %s\n",
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54 argv[1]);
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55 else
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56 goto invalid;
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57 }
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58 exit(0);
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59 }