FreeCalypso > hg > gsm-codec-lib
view amrconv/ietf-parse.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 | 934cf92a1c45 |
children |
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line source
/* * This program reads an AMR recording in IETF RFC 4867 format and parses it * into a human-readable form. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "amr_defs.h" extern char *amr_mode_names[16]; extern const char amr_file_hdr[IETF_HDR_LEN]; extern const uint8_t extra_bytes_per_ft[9]; main(argc, argv) char **argv; { char *infname; FILE *inf; uint8_t frm_in[MAX_IF1_BYTES]; unsigned frame_no, mode, qbit, sti, sid_mode; uint8_t ser_bits[MAX_SERIAL_SIZE]; uint16_t params[MAX_PRM_SIZE]; int rc; if (argc != 2) { fprintf(stderr, "usage: %s amr_file\n", argv[0]); exit(1); } infname = argv[1]; inf = fopen(infname, "r"); if (!inf) { perror(infname); exit(1); } if (fread(frm_in, 1, IETF_HDR_LEN, inf) != IETF_HDR_LEN || bcmp(frm_in, amr_file_hdr, IETF_HDR_LEN)) { fprintf(stderr, "error: %s is not in IETF AMR format\n", infname); exit(1); } for (frame_no = 0; ; frame_no++) { rc = getc(inf); if (rc < 0) break; mode = (rc & 0x78) >> 3; qbit = (rc & 4) >> 2; printf("#%u: FT=%u (%s) Q=%u\n", frame_no, mode, amr_mode_names[mode], qbit); if (mode == MODE_NO_DATA) continue; if (mode > MRDTX) { fprintf(stderr, "error in frame #%u: invalid FT=%u\n", frame_no, mode); exit(1); } rc = fread(frm_in, 1, extra_bytes_per_ft[mode], inf); if (rc != extra_bytes_per_ft[mode]) { fprintf(stderr, "error: short read from %s on frame #%u\n", infname, frame_no); exit(1); } amr_if1_unpack(frm_in, ser_bits, mode); reassemble_amr_params(ser_bits, params, mode); dump_amr_params(params, mode); if (mode == MRDTX) { sti = (frm_in[4] & 0x10) >> 4; sid_mode = 0; if (frm_in[4] & 0x08) sid_mode |= 1; if (frm_in[4] & 0x04) sid_mode |= 2; if (frm_in[4] & 0x02) sid_mode |= 4; printf(" SID_%s Mode=%u\n", sti ? "UPDATE" : "FIRST", sid_mode); } } exit(0); }