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annotate compal/melody-extr/extr-onemel.c @ 392:35009c936a4a

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compal/melody-extr: first attempt at actual melody extraction
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 01 Apr 2022 06:03:47 +0000
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35009c936a4a compal/melody-extr: first attempt at actual melody extraction
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This program is our attempt at extracting built-in melodies
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3 * from Mot C1xx firmware images.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9
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10 FILE *binf;
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11 int freq_offset;
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12 unsigned time_factor;
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13
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14 char *note_names[48] = {
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15 "f4","fs4","g4","gs4","a4","as4","b4", "c5","cs5","d5","ds5","e5",
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16 "f5","fs5","g5","gs5","a5","as5","b5", "c6","cs6","d6","ds6","e6",
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17 "f6","fs6","g6","gs6","a6","as6","b6", "c7","cs7","d7","ds7","e7",
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18 "f7","fs7","g7","gs7","a7","as7","b7", "c8","cs8","d8","ds8","e8"
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19 };
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20
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21 open_and_seek_input(binfname, offset_arg)
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22 char *binfname, *offset_arg;
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23 {
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24 u_long offset;
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25
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26 binf = fopen(binfname, "r");
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27 if (!binf) {
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28 perror(binfname);
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29 exit(1);
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30 }
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31 offset = strtoul(offset_arg, 0, 0);
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32 fseek(binf, offset, SEEK_SET);
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33 }
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34
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35 process_record()
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36 {
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37 u_char record[4];
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38 int note, vol_adj;
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39 unsigned duration;
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40
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41 if (fread(&record, sizeof record, 1, binf) != 1) {
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42 fprintf(stderr, "error reading from binary file\n");
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43 exit(1);
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44 }
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45 duration = record[0] * time_factor + 1;
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46 if (record[2]) {
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47 note = record[2] + freq_offset;
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48 if (note < 1 || note > 48) {
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49 fprintf(stderr, "error: note is out of range\n");
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50 exit(1);
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51 }
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52 note--;
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53 printf("%s\t64\t%u", note_names[note], duration);
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54 vol_adj = record[1];
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55 if (vol_adj) {
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56 if (vol_adj >= 128)
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57 vol_adj -= 256;
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58 printf("\t# Vol %+d", vol_adj);
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59 }
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60 fputs("\nrest\t\t2\n", stdout);
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61 } else {
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62 printf("rest\t\t%u\n", duration);
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63 }
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64 }
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65
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66 main(argc, argv)
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67 char **argv;
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68 {
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69 unsigned n, num_entries;
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70
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71 if (argc != 6) {
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72 fprintf(stderr,
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73 "usage: %s fw-image-file file-offset num-entries freq-off time-mult\n",
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74 argv[0]);
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75 exit(1);
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76 }
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77 open_and_seek_input(argv[1], argv[2]);
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78 num_entries = strtoul(argv[3], 0, 0);
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79 freq_offset = atoi(argv[4]);
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80 time_factor = atoi(argv[5]);
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81 for (n = 0; n < num_entries; n++)
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82 process_record();
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83 exit(0);
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84 }