FreeCalypso > hg > gsm-codec-lib

annotate miscutil/amr2efr.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents 41f1ae68d253
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
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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 }