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annotate miscutil/fc-gsm2vm.c @ 611:c847d742ab38

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doc/Loadtools-performance: article started
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 24 Feb 2020 21:44:13 +0000
parents f736f3ce8310
children
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f736f3ce8310 fc-gsm2vm utility written
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1 /*
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2 * This utility converts a GSM 06.10 speech recording from the format that is
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3 * commonly accepted as standard in the Unix/Linux world (libgsm format) into
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4 * a voice memo file that can be uploaded into the FFS of a FreeCalypso device
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5 * and played with the audio_vm_play_start() API or the AT@VMP command that
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6 * invokes the latter.
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7 */
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8
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9 #include <sys/types.h>
f736f3ce8310 fc-gsm2vm utility written
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12
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13 main(argc, argv)
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14 char **argv;
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15 {
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16 FILE *inf, *outf;
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17 u_char libgsm_bytes[33], tidsp_bytes[34], arm_bytes[34];
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18 static u_char header_bytes[6] = {0x00, 0xC4, 0x00, 0x00, 0x00, 0x00};
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19 static u_char endmarker[2] = {0xFF, 0xFB};
f736f3ce8310 fc-gsm2vm utility written
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20 int cc, i, gotsome = 0;
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21
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22 if (argc != 3) {
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23 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
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24 exit(1);
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25 }
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26 inf = fopen(argv[1], "r");
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27 if (!inf) {
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28 perror(argv[1]);
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29 exit(1);
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30 }
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31 outf = fopen(argv[2], "w");
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32 if (!outf) {
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33 perror(argv[2]);
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34 exit(1);
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35 }
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36 tidsp_bytes[33] = 0;
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37 for (;;) {
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38 cc = fread(libgsm_bytes, 1, 33, inf);
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39 if (cc < 33)
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40 break;
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41 if ((libgsm_bytes[0] & 0xF0) != 0xD0) {
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42 invalid: fprintf(stderr, "error: %s is not in libgsm format\n",
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43 argv[1]);
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44 exit(1);
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45 }
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46 gsm0610_libgsm_to_tidsp(libgsm_bytes, tidsp_bytes);
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47 for (i = 0; i < 34; i += 2) {
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48 arm_bytes[i] = tidsp_bytes[i+1];
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49 arm_bytes[i+1] = tidsp_bytes[i];
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50 }
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51 fwrite(header_bytes, 1, 6, outf);
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52 fwrite(arm_bytes, 1, 34, outf);
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53 gotsome = 1;
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54 }
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55 fwrite(endmarker, 1, 2, outf);
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56 fclose(outf);
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57 if (cc) {
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58 if (gotsome)
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59 fprintf(stderr,
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60 "warning: extra non-33 bytes at the end of %s\n",
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61 argv[1]);
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62 else
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63 goto invalid;
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64 }
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65 exit(0);
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66 }