FreeCalypso > hg > gsm-codec-lib
annotate miscutil/amr2efr.c @ 126:6fd49f73b025
doc/RTP-BFI-extension: add note about GSM-HR and RFC 5993
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 11 Dec 2022 00:56:17 +0000 |
parents | 41f1ae68d253 |
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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; |
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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 |
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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 } |
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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 } |