FreeCalypso > hg > gsm-codec-lib
view efrtest/dlcap-gsmx.c @ 282:9ee8ad3d4d30
frtest: rm gsmfr-hand-test and gsmfr-max-out utils
These hack programs were never properly documented and were written
only as part of a debug chase, in pursuit of a bug that ultimately
turned out to be in our then-hacky patch to osmo-bts-sysmo,
before beginning of proper patches in Osmocom. These hack programs
need to be dropped from the present sw package because they depend
on old libgsm, and we are eliminating that dependency.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sun, 14 Apr 2024 05:44:47 +0000 |
parents | 6e39fc0134da |
children |
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/* * This program reads a TCH/EFS downlink capture produced with FreeCalypso tools * (fw version with TCH downlink sniffing feature and fc-shell tch record) * and converts it into our extended-libgsm binary format, to be further * fed to gsmefr-decode or other tools. */ #include <ctype.h> #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> main(argc, argv) char **argv; { FILE *inf, *outf; char linebuf[128]; int lineno, rc; uint16_t status_words[3]; uint8_t tidsp_bytes[33], efr_bytes[31], bfi[2]; unsigned fn_mod_104; 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 (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) { /* support both old and new formats */ if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) && isxdigit(linebuf[2]) && isxdigit(linebuf[3])) { rc = parse_dlcap_common(linebuf, status_words, tidsp_bytes); if (rc < 0) { invalid: fprintf(stderr, "error: %s is not in the expected format\n", argv[1]); exit(1); } fn_mod_104 = 0; /* won't have TAF */ } else if (!strncmp(linebuf, "EFR ", 4)) { rc = parse_dlcap_common(linebuf + 4, status_words, tidsp_bytes); if (rc < 0) goto invalid; if (linebuf[85] != ' ') goto invalid; if (!isdigit(linebuf[86])) goto invalid; fn_mod_104 = strtoul(linebuf + 86, 0, 10); } else goto invalid; /* * DSP flags are documented in the TCH-tap-modes article * in freecalypso-docs. */ if ((status_words[0] & 0xC204) == 0xC000) { efr_tidsp_to_std(tidsp_bytes, efr_bytes); fwrite(efr_bytes, 1, 31, outf); } else { bfi[0] = 0xBF; bfi[1] = fn_mod_104 == 60; fwrite(bfi, 1, 2, outf); } } exit(0); }