FreeCalypso > hg > freecalypso-tools
diff tchtools/fc-fr2tch.c @ 902:8ddb16a37273
tree org: move TCH and VM utils from miscutil to tchtools
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Wed, 28 Dec 2022 07:52:30 +0000 |
parents | miscutil/fc-fr2tch.c@7eaa3307e5df |
children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/tchtools/fc-fr2tch.c Wed Dec 28 07:52:30 2022 +0000 @@ -0,0 +1,59 @@ +/* + * 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); +}