FreeCalypso > hg > gsm-codec-lib

comparison efrtest/dlcap-dec.c @ 164:5f23cb3f0f8d

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gsmefr-dlcap-dec program written
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 16 Dec 2022 03:05:21 +0000
parents efrtest/dlcap-gsmx.c@3bbb16015a79
children
comparison
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163:3bbb16015a79 164:5f23cb3f0f8d
1 /*
2 * This program reads a TCH/EFS downlink capture produced with FreeCalypso tools
3 * (fw version with TCH downlink sniffing feature and fc-shell tch record)
4 * and feeds it to our libgsmefr decoder, making our best attempt to
5 * replicate the processing steps that must be performed by the original DSP.
6 *
7 * The output format is "robe" (raw big-endian).
8 */
9
10 #include <ctype.h>
11 #include <stdio.h>
12 #include <stdint.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <strings.h>
16 #include "../libgsmefr/gsm_efr.h"
17
18 main(argc, argv)
19 char **argv;
20 {
21 FILE *inf, *outf;
22 struct EFR_decoder_state *state;
23 char linebuf[128];
24 int lineno, rc;
25 uint16_t status_words[3];
26 uint8_t tidsp_bytes[33], frame[EFR_RTP_FRAME_LEN];
27 int16_t params[EFR_NUM_PARAMS], pcm[160];
28 unsigned fn_mod_104;
29 int bfi, taf, sid;
30
31 if (argc != 3) {
32 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
33 exit(1);
34 }
35 inf = fopen(argv[1], "r");
36 if (!inf) {
37 perror(argv[1]);
38 exit(1);
39 }
40 outf = fopen(argv[2], "w");
41 if (!outf) {
42 perror(argv[2]);
43 exit(1);
44 }
45 state = EFR_decoder_create();
46 if (!state) {
47 perror("EFR_decoder_create()");
48 exit(1);
49 }
50 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
51 /* support both old and new formats */
52 if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) &&
53 isxdigit(linebuf[2]) && isxdigit(linebuf[3])) {
54 rc = parse_dlcap_common(linebuf, status_words,
55 tidsp_bytes);
56 if (rc < 0) {
57 invalid: fprintf(stderr,
58 "error: %s is not in the expected format\n",
59 argv[1]);
60 exit(1);
61 }
62 fn_mod_104 = 0; /* won't have TAF */
63 } else if (!strncmp(linebuf, "EFR ", 4)) {
64 rc = parse_dlcap_common(linebuf + 4, status_words,
65 tidsp_bytes);
66 if (rc < 0)
67 goto invalid;
68 if (linebuf[85] != ' ')
69 goto invalid;
70 if (!isdigit(linebuf[86]))
71 goto invalid;
72 fn_mod_104 = strtoul(linebuf + 86, 0, 10);
73 } else
74 goto invalid;
75 /* processing, hoping to replicate what the DSP does */
76 efr_tidsp_to_std(tidsp_bytes, frame);
77 EFR_frame2params(frame, params);
78 bfi = (status_words[0] & 0x0204) != 0;
79 sid = (status_words[0] & 0x0018) >> 3;
80 taf = fn_mod_104 == 60;
81 EFR_decode_params(state, params, bfi, sid, taf, pcm);
82 write_pcm_to_robe(outf, pcm);
83 }
84 exit(0);
85 }