FreeCalypso > hg > gsm-codec-lib
annotate efrtest/dlcap-gsmx.c @ 183:452c1d5a6268
libgsmefr BFI w/o data: emit zero output after decoder reset
In real-life usage, each EFR decoder session will most likely begin
with lots of BFI frames before the first real frame arrives. However,
because the spec-defined home state of the decoder is speech rather
than CN, our regular logic for BFI w/o data would have to feed
pseudorandom noise to the decoder (in the "fixed codebook excitation
pulses" part), which is silly to do at the beginning of the decoder
session right out of reset. Therefore, let's check reset_flag_old,
and if we are still in the reset state, simply emit zero output.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 03 Jan 2023 00:12:18 +0000 |
parents | 6e39fc0134da |
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rev | line source |
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1 /* |
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2 * This program reads a TCH/EFS downlink capture produced with FreeCalypso tools |
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3 * (fw version with TCH downlink sniffing feature and fc-shell tch record) |
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4 * and converts it into our extended-libgsm binary format, to be further |
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5 * fed to gsmefr-decode or other tools. |
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6 */ |
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7 |
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8 #include <ctype.h> |
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9 #include <stdio.h> |
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10 #include <stdint.h> |
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11 #include <stdlib.h> |
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12 #include <string.h> |
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13 #include <strings.h> |
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14 |
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15 main(argc, argv) |
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16 char **argv; |
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17 { |
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18 FILE *inf, *outf; |
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19 char linebuf[128]; |
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20 int lineno, rc; |
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21 uint16_t status_words[3]; |
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22 uint8_t tidsp_bytes[33], efr_bytes[31], bfi[2]; |
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23 unsigned fn_mod_104; |
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24 |
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25 if (argc != 3) { |
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26 fprintf(stderr, "usage: %s infile outfile\n", argv[0]); |
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27 exit(1); |
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28 } |
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29 inf = fopen(argv[1], "r"); |
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30 if (!inf) { |
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31 perror(argv[1]); |
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32 exit(1); |
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33 } |
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34 outf = fopen(argv[2], "w"); |
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35 if (!outf) { |
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36 perror(argv[2]); |
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37 exit(1); |
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38 } |
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39 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) { |
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40 /* support both old and new formats */ |
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41 if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) && |
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42 isxdigit(linebuf[2]) && isxdigit(linebuf[3])) { |
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43 rc = parse_dlcap_common(linebuf, status_words, |
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44 tidsp_bytes); |
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45 if (rc < 0) { |
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46 invalid: fprintf(stderr, |
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47 "error: %s is not in the expected format\n", |
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48 argv[1]); |
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49 exit(1); |
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50 } |
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51 fn_mod_104 = 0; /* won't have TAF */ |
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52 } else if (!strncmp(linebuf, "EFR ", 4)) { |
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53 rc = parse_dlcap_common(linebuf + 4, status_words, |
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54 tidsp_bytes); |
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55 if (rc < 0) |
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56 goto invalid; |
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57 if (linebuf[85] != ' ') |
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58 goto invalid; |
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59 if (!isdigit(linebuf[86])) |
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60 goto invalid; |
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61 fn_mod_104 = strtoul(linebuf + 86, 0, 10); |
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62 } else |
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63 goto invalid; |
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64 /* |
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65 * DSP flags are documented in the TCH-tap-modes article |
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66 * in freecalypso-docs. |
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67 */ |
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68 if ((status_words[0] & 0xC204) == 0xC000) { |
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69 efr_tidsp_to_std(tidsp_bytes, efr_bytes); |
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70 fwrite(efr_bytes, 1, 31, outf); |
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71 } else { |
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72 bfi[0] = 0xBF; |
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73 bfi[1] = fn_mod_104 == 60; |
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74 fwrite(bfi, 1, 2, outf); |
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75 } |
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76 } |
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77 exit(0); |
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78 } |