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annotate amrconv/amr2efr.c @ 481:cc0c244bd233

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doc/AMR-library-tests: new article
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:02:37 +0000
parents b092a510141e
children
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1 /*
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2 * Our gsm-amr2efr utility reads in a speech recording in .amr format
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3 * (the mode must be MR122 for every frame, no DTX) and converts it into
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4 * our ad hoc .gsmx format for EFR. The conversion is a bit reshuffling
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5 * only, no transcoding takes place.
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6 */
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7
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8 #include <stdio.h>
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9 #include <stdint.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13
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14 extern const uint8_t amr_122_bit_order[244];
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15
102
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16 static const char amr_file_hdr[] = "#!AMR\n";
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17
101
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18 main(argc, argv)
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19 char **argv;
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20 {
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21 char *infname, *outfname;
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22 FILE *inf, *outf;
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23 int wrong_flag, hdrb;
101
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24 uint8_t frm_in[31], frm_out[31];
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25 unsigned bit_a, bit_n;
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26
105
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27 if (argc == 3 && argv[1][0] != '-') {
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28 wrong_flag = 0;
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29 infname = argv[1];
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30 outfname = argv[2];
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31 } else if (argc == 4 && !strcmp(argv[1], "-w")) {
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32 wrong_flag = 1;
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33 infname = argv[2];
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34 outfname = argv[3];
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35 } else {
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36 fprintf(stderr, "usage: %s [-w] input.amr output.gsmx\n",
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37 argv[0]);
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38 exit(1);
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39 }
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40 inf = fopen(infname, "r");
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41 if (!inf) {
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42 perror(infname);
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43 exit(1);
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44 }
102
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45 if (fread(frm_in, 1, 6, inf) != 6 || bcmp(frm_in, amr_file_hdr, 6)) {
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46 fprintf(stderr, "error: %s is not in AMR format\n", infname);
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47 exit(1);
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48 }
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49 outf = fopen(outfname, "w");
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50 if (!outf) {
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51 perror(outfname);
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52 exit(1);
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53 }
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54 for (;;) {
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55 hdrb = getc(inf);
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56 if (hdrb < 0)
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57 break;
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58 if ((hdrb & 0x78) != 0x38) {
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59 fprintf(stderr, "error: unexpected content in %s\n",
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60 infname);
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61 exit(1);
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62 }
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63 if (fread(frm_in, 1, 31, inf) != 31) {
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64 fprintf(stderr, "error: short read from %s\n", infname);
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65 exit(1);
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66 }
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67 frm_out[0] = 0xC0;
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68 for (bit_a = 0; bit_a < 244; bit_a++) {
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69 if (wrong_flag)
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70 bit_n = bit_a;
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71 else
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72 bit_n = amr_122_bit_order[bit_a];
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73 msb_set_bit(frm_out, 4 + bit_n,
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74 msb_get_bit(frm_in, bit_a));
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75 }
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76 fwrite(frm_out, 1, 31, outf);
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77 }
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78 fclose(outf);
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79 exit(0);
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80 }