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annotate tchtools/fc-vm2gsmx.c @ 905:546bf873ccc8

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tchtools: new program fc-vm2gsmx
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 28 Dec 2022 09:08:50 +0000
parents tchtools/fc-vm2hex.c@5041bcb8140f
children
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1 /*
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2 * This utility converts old-fashioned (non-AMR) TCS211 voice memo files
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3 * read out of FFS into Themyscira Wireless gsmx (extended-libgsm) format,
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4 * allowing further decoding into playable speech with gsmfr-decode.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10
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11 static char *infname;
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12 static FILE *inf, *outf;
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13 static u_long file_offset;
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14
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15 static const u_char bfi_marker[2] = {0xBF, 0x00};
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16
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17 static unsigned
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18 get_word()
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19 {
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20 u_char b[2];
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21 int i, c;
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22
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23 for (i = 0; i < 2; i++) {
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24 c = getc(inf);
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25 if (c < 0) {
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26 fprintf(stderr, "error: premature EOF in %s\n",
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27 infname);
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28 exit(1);
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29 }
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30 b[i] = c;
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31 file_offset++;
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32 }
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33 return((b[1] << 8) | b[0]);
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34 }
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35
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36 static void
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37 read_dsp_bytes(bytes)
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38 u_char *bytes;
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39 {
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40 int i, dp;
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41 unsigned word;
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42
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43 dp = 0;
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44 for (i = 0; i < 17; i++) {
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45 word = get_word();
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46 bytes[dp++] = word >> 8;
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47 bytes[dp++] = word;
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48 }
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49 }
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50
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51 static void
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52 convert_speech_sample()
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53 {
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54 u_char tidsp_bytes[34], libgsm_bytes[33];
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55
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56 read_dsp_bytes(tidsp_bytes);
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57 gsm0610_tidsp_to_libgsm(tidsp_bytes, libgsm_bytes);
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58 fwrite(libgsm_bytes, 1, 33, outf);
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59 }
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60
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61 main(argc, argv)
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62 char **argv;
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63 {
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64 unsigned first_word;
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65
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66 if (argc != 3) {
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67 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
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68 exit(1);
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69 }
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70 infname = argv[1];
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71 inf = fopen(infname, "r");
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72 if (!inf) {
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73 perror(infname);
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74 exit(1);
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75 }
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76 outf = fopen(argv[2], "w");
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77 if (!outf) {
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78 perror(argv[2]);
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79 exit(1);
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80 }
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81 for (;;) {
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82 first_word = get_word();
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83 if (first_word == 0xFBFF) /* SC_VM_END_MASK */
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84 break;
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85 if ((first_word & 0xB7FF) == 0x8400) {
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86 /* skip dummy header words 1 and 2 */
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87 get_word();
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88 get_word();
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89 /* process the actual speech or SID frame */
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90 convert_speech_sample();
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91 } else if (first_word == 0x0400) {
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92 /* it's a skipped frame, aka BFI */
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93 fwrite(bfi_marker, 1, 2, outf);
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94 } else {
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95 fprintf(stderr,
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96 "error in %s at offset 0x%lx: invalid frame header word 0x%04X\n",
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97 infname, file_offset, first_word);
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98 exit(1);
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99 }
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100 }
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101 fclose(outf);
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102 exit(0);
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103 }