FreeCalypso > hg > freecalypso-tools
annotate miscutil/fc-tch2fr.c @ 416:30f6d1c32c6f
doc/Flash-boot-defect article removed (no longer relevant)
This article is no longer relevant because the issue in question
only affected one (1) defective FCDEV3B board which was not
and never will be sold.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 26 Oct 2018 07:11:08 +0000 |
parents | d57f68d0568d |
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fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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1 /* |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
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2 * Our experimental Calypso firmware enables us to capture the output of |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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3 * the GSM 05.03 channel decoder in the DSP, i.e., the bits leaving the |
d57f68d0568d
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4 * channel decoder and going into the speech decoder. Our fc-shell utility |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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5 * allows saving this capture to a file; the captured booty includes not only |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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6 * the expected 260 bits per frame, but also some DSP status words which are |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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7 * not fully understood, but which are believed to contain indications as to |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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8 * whether the decoded speech frame is good or bad. |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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9 * |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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10 * My first naive thought was to save the captured speech frames in libgsm |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
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11 * format so I could then play them with the 'play' command (SoX package) |
d57f68d0568d
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12 * under Linux, but the problem with this naive approach is that the bad frames |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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13 * indication is lost, and some of the saved "speech" frames will contain |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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14 * utter garbage, resulting in very unkind-on-ears noises if that file is |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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15 * then played. I don't know what the proper solution should be; I don't know |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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16 * what the commercial cellphone implementations of the GSM 06.10 speech decoder |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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17 * (buried in black box DSPs) do when they get bad frames from the channel |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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18 * decoder. |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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19 * |
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fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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20 * The present utility reproduces the naive behaviour of my previous |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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21 * implementation of fc-shell's tch record command: it takes hex files written |
d57f68d0568d
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Mychaela Falconia <falcon@freecalypso.org>
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22 * by the current implementation of tch record in fc-shell, DISREGARDS the |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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23 * DSP status words, and blindly converts each 260-bit frame (good or bad) |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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24 * into libgsm format. |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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25 */ |
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fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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26 |
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fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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27 #include <sys/types.h> |
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28 #include <ctype.h> |
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29 #include <stdio.h> |
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30 #include <stdlib.h> |
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31 |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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32 static |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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33 decode_hex_digit(ch) |
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34 { |
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Mychaela Falconia <falcon@freecalypso.org>
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35 if (isdigit(ch)) |
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Mychaela Falconia <falcon@freecalypso.org>
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36 return(ch - '0'); |
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37 else if (isupper(ch)) |
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Mychaela Falconia <falcon@freecalypso.org>
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38 return(ch - 'A' + 10); |
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fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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39 else |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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40 return(ch - 'a' + 10); |
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fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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41 } |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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42 |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
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43 main(argc, argv) |
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Mychaela Falconia <falcon@freecalypso.org>
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44 char **argv; |
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45 { |
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46 FILE *inf, *outf; |
d57f68d0568d
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47 char linebuf[128]; |
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48 int lineno; |
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49 char *cp; |
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50 int i, j; |
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51 u_char tidsp_bytes[33], libgsm_bytes[33]; |
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52 |
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53 if (argc != 3) { |
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54 fprintf(stderr, "usage: %s infile outfile\n", argv[0]); |
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55 exit(1); |
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56 } |
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57 inf = fopen(argv[1], "r"); |
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58 if (!inf) { |
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59 perror(argv[1]); |
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60 exit(1); |
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61 } |
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62 outf = fopen(argv[2], "w"); |
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63 if (!outf) { |
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64 perror(argv[2]); |
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65 exit(1); |
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66 } |
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fc-tch2fr utility written, added under miscutil
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67 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) { |
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68 /* skip DSP status words */ |
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69 cp = linebuf; |
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70 for (i = 0; i < 3; i++) { |
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71 for (j = 0; j < 4; j++) { |
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72 if (!isxdigit(*cp++)) { |
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Mychaela Falconia <falcon@freecalypso.org>
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73 invalid: fprintf(stderr, |
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Mychaela Falconia <falcon@freecalypso.org>
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74 "error: %s is not in the expected format\n", |
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Mychaela Falconia <falcon@freecalypso.org>
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75 argv[1]); |
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76 exit(1); |
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77 } |
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Mychaela Falconia <falcon@freecalypso.org>
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78 } |
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Mychaela Falconia <falcon@freecalypso.org>
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79 if (*cp++ != ' ') |
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Mychaela Falconia <falcon@freecalypso.org>
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80 goto invalid; |
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Mychaela Falconia <falcon@freecalypso.org>
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81 } |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
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82 /* read the frame bits */ |
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Mychaela Falconia <falcon@freecalypso.org>
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83 for (i = 0; i < 33; i++) { |
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Mychaela Falconia <falcon@freecalypso.org>
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84 if (!isxdigit(cp[0]) || !isxdigit(cp[1])) |
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Mychaela Falconia <falcon@freecalypso.org>
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85 goto invalid; |
d57f68d0568d
fc-tch2fr utility written, added under miscutil
Mychaela Falconia <falcon@freecalypso.org>
parents:
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86 tidsp_bytes[i] = (decode_hex_digit(cp[0]) << 4) | |
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Mychaela Falconia <falcon@freecalypso.org>
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87 decode_hex_digit(cp[1]); |
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88 cp += 2; |
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89 } |
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Mychaela Falconia <falcon@freecalypso.org>
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90 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes); |
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91 fwrite(libgsm_bytes, 1, 33, outf); |
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92 } |
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Mychaela Falconia <falcon@freecalypso.org>
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93 exit(0); |
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94 } |