FreeCalypso > hg > gsm-codec-lib

annotate amrconv/efr2amr.c @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents b092a510141e
children
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1 /*
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2 * Our gsm-efr2amr utility reads in an EFR speech recording in our
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3 * extended-libgsm file format and converts it to AMR, inserting
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4 * an AMR NO_DATA frame in the place of every BFI in the input
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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
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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 char *infname, *outfname;
103
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24 FILE *inf, *outf;
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25 int wrong_flag;
103
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26 uint8_t frm_in[BINFILE_MAX_FRAME], frm_out[32];
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27 unsigned bit_a, bit_n, outlen;
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28 int rc, bfi;
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29
106
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30 if (argc == 3 && argv[1][0] != '-') {
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31 wrong_flag = 0;
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32 infname = argv[1];
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33 outfname = argv[2];
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34 } else if (argc == 4 && !strcmp(argv[1], "-w")) {
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35 wrong_flag = 1;
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36 infname = argv[2];
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37 outfname = argv[3];
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38 } else {
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39 fprintf(stderr, "usage: %s [-w] input.gsmx output.amr\n",
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40 argv[0]);
103
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41 exit(1);
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42 }
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43 inf = fopen(infname, "r");
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44 if (!inf) {
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45 perror(infname);
103
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46 exit(1);
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47 }
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48 outf = fopen(outfname, "w");
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49 if (!outf) {
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50 perror(outfname);
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51 exit(1);
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52 }
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53 fwrite(amr_file_hdr, 1, 6, outf);
103
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54 for (;;) {
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55 rc = binfile_read_frame(inf, frm_in);
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56 if (rc < 0) {
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57 fprintf(stderr, "error: garbage in %s\n", infname);
103
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58 exit(1);
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59 }
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60 if (!rc)
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61 break;
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62 if (frm_in[0] == 0xBF)
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63 bfi = 1;
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64 else if ((frm_in[0] & 0xF0) == 0xC0)
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65 bfi = 0;
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66 else {
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67 fprintf(stderr,
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68 "error: %s is not in EFR codec format\n",
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69 infname);
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70 exit(1);
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71 }
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72 if (bfi) {
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73 frm_out[0] = 0x78;
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74 outlen = 1;
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75 } else {
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76 frm_out[0] = 0x3C;
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77 frm_out[31] = 0;
103
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78 for (bit_a = 0; bit_a < 244; bit_a++) {
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79 if (wrong_flag)
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80 bit_n = bit_a;
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81 else
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82 bit_n = amr_122_bit_order[bit_a];
103
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83 msb_set_bit(frm_out + 1, bit_a,
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84 msb_get_bit(frm_in, 4 + bit_n));
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85 }
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86 outlen = 32;
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87 }
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88 fwrite(frm_out, 1, outlen, outf);
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89 }
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90 fclose(outf);
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91 exit(0);
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92 }