FreeCalypso > hg > gsm-codec-lib
view efrtest/dlcap-dec.c @ 216:9d59df9b0e4e
amrconv: new program amr-ietf2cod
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 21 Apr 2023 21:28:02 +0000 |
parents | 5f23cb3f0f8d |
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 feeds it to our libgsmefr decoder, making our best attempt to * replicate the processing steps that must be performed by the original DSP. * * The output format is "robe" (raw big-endian). */ #include <ctype.h> #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "../libgsmefr/gsm_efr.h" main(argc, argv) char **argv; { FILE *inf, *outf; struct EFR_decoder_state *state; char linebuf[128]; int lineno, rc; uint16_t status_words[3]; uint8_t tidsp_bytes[33], frame[EFR_RTP_FRAME_LEN]; int16_t params[EFR_NUM_PARAMS], pcm[160]; unsigned fn_mod_104; int bfi, taf, sid; 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); } state = EFR_decoder_create(); if (!state) { perror("EFR_decoder_create()"); 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; /* processing, hoping to replicate what the DSP does */ efr_tidsp_to_std(tidsp_bytes, frame); EFR_frame2params(frame, params); bfi = (status_words[0] & 0x0204) != 0; sid = (status_words[0] & 0x0018) >> 3; taf = fn_mod_104 == 60; EFR_decode_params(state, params, bfi, sid, taf, pcm); write_pcm_to_robe(outf, pcm); } exit(0); }