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annotate miscutil/efr2amr.c @ 103:0123ca1f1402

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gsm-efr2amr utility written
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 27 Nov 2022 05:41:13 +0000
parents
children 7f43089e9a7a
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103
0123ca1f1402 gsm-efr2amr utility written
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
0123ca1f1402 gsm-efr2amr utility written
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2 * Our gsm-efr2amr utility reads in an EFR speech recording in our
0123ca1f1402 gsm-efr2amr utility written
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3 * extended-libgsm file format and converts it to AMR, inserting
0123ca1f1402 gsm-efr2amr utility written
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4 * an AMR NO_DATA frame in the place of every BFI in the input
0123ca1f1402 gsm-efr2amr utility written
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5 * but NOT performing any special handling or even detection of
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6 * EFR SID frames.
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7 */
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8
0123ca1f1402 gsm-efr2amr utility written
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9 #include <stdio.h>
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10 #include <stdint.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include "../libtest/binreader.h"
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15
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16 extern const uint8_t amr_122_bit_order[244];
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17
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18 static const char amr_file_hdr[] = "#!AMR\n";
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19
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20 main(argc, argv)
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21 char **argv;
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22 {
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23 FILE *inf, *outf;
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24 uint8_t frm_in[BINFILE_MAX_FRAME], frm_out[32];
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25 unsigned bit_a, bit_n, outlen;
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26 int rc, bfi;
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27
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28 if (argc != 3) {
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29 fprintf(stderr, "usage: %s input.gsmx output.amr\n", argv[0]);
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30 exit(1);
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31 }
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32 inf = fopen(argv[1], "r");
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33 if (!inf) {
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34 perror(argv[1]);
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35 exit(1);
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36 }
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37 outf = fopen(argv[2], "w");
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38 if (!outf) {
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39 perror(argv[2]);
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40 exit(1);
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41 }
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42 for (;;) {
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43 rc = binfile_read_frame(inf, frm_in);
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44 if (rc < 0) {
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45 fprintf(stderr, "error: garbage in %s\n", argv[1]);
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46 exit(1);
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47 }
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48 if (!rc)
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49 break;
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50 if (frm_in[0] == 0xBF)
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51 bfi = 1;
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52 else if ((frm_in[0] & 0xF0) == 0xC0)
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53 bfi = 0;
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54 else {
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55 fprintf(stderr,
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56 "error: %s is not in EFR codec format\n",
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57 argv[1]);
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58 exit(1);
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59 }
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60 if (bfi) {
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61 frm_out[0] = 0x78;
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62 outlen = 1;
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63 } else {
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64 frm_out[0] = 0x3C;
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65 bzero(frm_out + 1, 31);
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66 for (bit_a = 0; bit_a < 244; bit_a++) {
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67 bit_n = amr_122_bit_order[bit_a];
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68 msb_set_bit(frm_out + 1, bit_a,
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69 msb_get_bit(frm_in, 4 + bit_n));
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70 }
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71 outlen = 32;
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72 }
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73 fwrite(frm_out, 1, outlen, outf);
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74 }
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75 fclose(outf);
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76 exit(0);
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77 }