FreeCalypso > hg > freecalypso-tools
view tchtools/fc-fr2tch.c @ 920:0306449ba467
doc/TIFFS-Overview: document classic filename and pathname limits
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 31 Dec 2022 21:08:05 +0000 |
parents | 8ddb16a37273 |
children |
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/* * This utility converts a GSM 06.10 speech recording from the format that is * commonly accepted as standard in the Unix/Linux world (libgsm format) into * hex strings of TCH bits to be fed to the GSM 05.03 channel encoder by way * of a TI Calypso GSM device, a FreeCalypso GSM firmware version with the * TCH rerouting feature, and fc-shell's tch play command. */ #include <sys/types.h> #include <stdio.h> #include <stdlib.h> main(argc, argv) char **argv; { FILE *inf, *outf; u_char libgsm_bytes[33], tidsp_bytes[33]; int cc, i, gotsome = 0; if (argc != 3) { fprintf(stderr, "usage: %s infile outfile\n", argv[0]); exit(1); } inf = fopen(argv[1], "r"); if (!inf) { perror(argv[1]); exit(1); } outf = fopen(argv[2], "w"); if (!outf) { perror(argv[2]); exit(1); } for (;;) { cc = fread(libgsm_bytes, 1, 33, inf); if (cc < 33) break; if ((libgsm_bytes[0] & 0xF0) != 0xD0) { invalid: fprintf(stderr, "error: %s is not in libgsm format\n", argv[1]); exit(1); } gsm0610_libgsm_to_tidsp(libgsm_bytes, tidsp_bytes); for (i = 0; i < 33; i++) fprintf(outf, "%02X", tidsp_bytes[i]); putc('\n', outf); gotsome = 1; } fclose(outf); if (cc) { if (gotsome) fprintf(stderr, "warning: extra non-33 bytes at the end of %s\n", argv[1]); else goto invalid; } exit(0); }