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comparison miscutil/fc-fr2tch.c @ 5:7eaa3307e5df

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fc-fr2tch utility written, added under miscutil
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 14 Jun 2016 01:40:14 +0000
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4:971906d7763d 5:7eaa3307e5df
1 /*
2 * This utility converts a GSM 06.10 speech recording from the format that is
3 * commonly accepted as standard in the Unix/Linux world (libgsm format) into
4 * hex strings of TCH bits to be fed to the GSM 05.03 channel encoder by way
5 * of a TI Calypso GSM device, a FreeCalypso GSM firmware version with the
6 * TCH rerouting feature, and fc-shell's tch play command.
7 */
8
9 #include <sys/types.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12
13 main(argc, argv)
14 char **argv;
15 {
16 FILE *inf, *outf;
17 u_char libgsm_bytes[33], tidsp_bytes[33];
18 int cc, i, gotsome = 0;
19
20 if (argc != 3) {
21 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
22 exit(1);
23 }
24 inf = fopen(argv[1], "r");
25 if (!inf) {
26 perror(argv[1]);
27 exit(1);
28 }
29 outf = fopen(argv[2], "w");
30 if (!outf) {
31 perror(argv[2]);
32 exit(1);
33 }
34 for (;;) {
35 cc = fread(libgsm_bytes, 1, 33, inf);
36 if (cc < 33)
37 break;
38 if ((libgsm_bytes[0] & 0xF0) != 0xD0) {
39 invalid: fprintf(stderr, "error: %s is not in libgsm format\n",
40 argv[1]);
41 exit(1);
42 }
43 gsm0610_libgsm_to_tidsp(libgsm_bytes, tidsp_bytes);
44 for (i = 0; i < 33; i++)
45 fprintf(outf, "%02X", tidsp_bytes[i]);
46 putc('\n', outf);
47 gotsome = 1;
48 }
49 fclose(outf);
50 if (cc) {
51 if (gotsome)
52 fprintf(stderr,
53 "warning: extra non-33 bytes at the end of %s\n",
54 argv[1]);
55 else
56 goto invalid;
57 }
58 exit(0);
59 }