FreeCalypso > hg > gsm-codec-lib
view frtest/dlcap-sync.c @ 510:5bf71b091323
libgsmhr1: add direct conversion from RTP input to decoder params
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 25 Aug 2024 02:19:37 +0000 |
parents | 285381a001fc |
children |
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/* * This program reads a TCH/FS downlink capture file from a FreeCalypso GSM MS * that was produced in a session in which seqsync PCMA or PCMU input * (seqsyn_[au].inp) was fed into the test call from IP-PSTN side. It looks * for FRv1 DHF followed by specific frame patterns given by ETSI in * syn???_[au].cod files, and reports what it finds. Matches indicate * a particular alignment between the input sequence and encoder frame * boundaries, if the network speech transcoder implements the encoder * homing feature which is optional for FRv1. */ #include <ctype.h> #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "../libgsmfr2/tw_gsmfr.h" extern const uint8_t sync_from_pcma[160*33]; extern const uint8_t sync_from_pcmu[160*33]; static int check_for_match(input, table) const uint8_t *input, *table; { unsigned n; for (n = 0; n < 160; n++) { if (!bcmp(input, table + n * 33, 33)) return n; } return -1; } main(argc, argv) char **argv; { FILE *inf; char linebuf[128]; int lineno, rc; uint16_t status_words[3]; uint8_t tidsp_bytes[33], libgsm_bytes[33]; const uint8_t *match_table; int dhf_state; if (argc != 3) { usage: fprintf(stderr, "usage: %s dlcap-file alaw|ulaw\n", argv[0]); exit(1); } inf = fopen(argv[1], "r"); if (!inf) { perror(argv[1]); exit(1); } if (!strcmp(argv[2], "alaw")) match_table = sync_from_pcma; else if (!strcmp(argv[2], "ulaw")) match_table = sync_from_pcmu; else goto usage; dhf_state = 0; 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); } } else if (!strncmp(linebuf, "FR ", 3)) { rc = parse_dlcap_common(linebuf + 3, status_words, tidsp_bytes); if (rc < 0) goto invalid; if (linebuf[84] != ' ') goto invalid; if (!isdigit(linebuf[85])) goto invalid; } else goto invalid; if ((status_words[0] & 0xC004) != 0xC000) { dhf_state = 0; continue; } gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes); if (!bcmp(libgsm_bytes, gsmfr_decoder_homing_frame, 33)) { dhf_state = 1; continue; } if (!dhf_state) continue; rc = check_for_match(libgsm_bytes, match_table); if (rc >= 0 && rc <= 159) { printf( "line %d: match to expected sync frame for offset %d\n", lineno, rc); } dhf_state = 0; } exit(0); }