FreeCalypso > hg > freecalypso-tools
diff tchtools/fc-efr2tch.c @ 906:94890123a74f
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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/tchtools/fc-efr2tch.c Wed Dec 28 10:05:46 2022 +0000 @@ -0,0 +1,59 @@ +/* + * This utility converts a GSM EFR speech recording from Themyscira Wireless + * gsmx format into hex strings of TCH UL bits, to be fed to the TCH UL play + * buffer in the Calypso DSP by way of a suitable FreeCalypso firmware version + * and the special tch play command in fc-shell. + */ + +#include <sys/types.h> +#include <stdio.h> +#include <stdlib.h> + +main(argc, argv) + char **argv; +{ + FILE *inf, *outf; + u_char efr_bytes[31], 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(efr_bytes, 1, 31, inf); + if (cc < 31) + break; + if ((efr_bytes[0] & 0xF0) != 0xC0) { +invalid: fprintf(stderr, + "error: %s is not in EFR codec format\n", + argv[1]); + exit(1); + } + efr_std_to_tidsp(efr_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-31 bytes at the end of %s\n", + argv[1]); + else + goto invalid; + } + exit(0); +}