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annotate tchtools/fc-efr2tch.c @ 906:94890123a74f

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tchtools: new program fc-efr2tch
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 28 Dec 2022 10:05:46 +0000
parents tchtools/fc-fr2tch.c@8ddb16a37273
children
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7eaa3307e5df fc-fr2tch utility written, added under miscutil
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1 /*
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2 * This utility converts a GSM EFR speech recording from Themyscira Wireless
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3 * gsmx format into hex strings of TCH UL bits, to be fed to the TCH UL play
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4 * buffer in the Calypso DSP by way of a suitable FreeCalypso firmware version
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5 * and the special tch play command in fc-shell.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11
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12 main(argc, argv)
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13 char **argv;
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14 {
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15 FILE *inf, *outf;
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16 u_char efr_bytes[31], tidsp_bytes[33];
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17 int cc, i, gotsome = 0;
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18
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19 if (argc != 3) {
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20 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
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21 exit(1);
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22 }
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23 inf = fopen(argv[1], "r");
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24 if (!inf) {
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25 perror(argv[1]);
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26 exit(1);
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27 }
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28 outf = fopen(argv[2], "w");
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29 if (!outf) {
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30 perror(argv[2]);
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31 exit(1);
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32 }
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33 for (;;) {
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34 cc = fread(efr_bytes, 1, 31, inf);
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35 if (cc < 31)
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36 break;
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37 if ((efr_bytes[0] & 0xF0) != 0xC0) {
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38 invalid: fprintf(stderr,
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39 "error: %s is not in EFR codec 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 efr_std_to_tidsp(efr_bytes, tidsp_bytes);
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44 for (i = 0; i < 33; i++)
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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-31 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 }