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annotate amrconv/cod2ietf.c @ 215:4c4649a5fec3

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amrconv: new program amr-cod2ietf
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 21 Apr 2023 06:30:29 +0000
parents amrconv/cod-parse.c@0beafaa0623f
children
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1 /*
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2 * This program converts an AMR-encoded speech recording from the .cod
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3 * format used by 3GPP test sequences into the more common .amr format
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4 * of IETF RFC 4867.
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5 */
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6
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7 #include <stdio.h>
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8 #include <stdint.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <strings.h>
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12 #include "amr_defs.h"
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13
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14 extern unsigned amr_bit_lengths[9];
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15 extern const char amr_file_hdr[IETF_HDR_LEN];
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16 extern const uint8_t extra_bytes_per_ft[9];
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17
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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 big_endian;
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24 unsigned frame_no, type, mode, outlen;
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25 uint8_t input_bits[COD_FORMAT_NWORDS], frm_out[MAX_IF1_BYTES+1];
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26 int rc;
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27
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28 if (argc == 3 && argv[1][0] != '-') {
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29 big_endian = 0;
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30 infname = argv[1];
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31 outfname = argv[2];
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32 } else if (argc == 4 && !strcmp(argv[1], "-b")) {
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33 big_endian = 1;
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34 infname = argv[2];
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35 outfname = argv[3];
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36 } else {
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37 fprintf(stderr, "usage: %s [-b] input.cod output.amr\n",
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38 argv[0]);
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39 exit(1);
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40 }
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41 inf = fopen(infname, "r");
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42 if (!inf) {
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43 perror(infname);
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44 exit(1);
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45 }
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46 outf = fopen(outfname, "w");
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47 if (!outf) {
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48 perror(outfname);
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49 exit(1);
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50 }
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51 fwrite(amr_file_hdr, 1, IETF_HDR_LEN, outf);
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52 for (frame_no = 0; ; frame_no++) {
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53 rc = read_cod_bits(inf, big_endian, input_bits, infname);
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54 if (!rc)
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55 break;
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56 type = input_bits[0];
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57 mode = input_bits[245];
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58 switch (type) {
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59 case TX_SPEECH_GOOD:
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60 if (mode > MR122) {
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61 invalid_mode: fprintf(stderr,
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62 "error in %s frame #%u: invalid mode\n",
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63 infname, frame_no);
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64 exit(1);
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65 }
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66 preen_frame_bits(input_bits+1, amr_bit_lengths[mode],
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67 infname, frame_no);
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68 frm_out[0] = (mode << 3) | 0x04;
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69 amr_if1_pack(frm_out+1, input_bits+1, mode);
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70 outlen = extra_bytes_per_ft[mode] + 1;
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71 break;
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72 case TX_SID_FIRST:
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73 case TX_SID_UPDATE:
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74 if (mode > MR122)
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75 goto invalid_mode;
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76 preen_frame_bits(input_bits+1, AMR_NBITS_SID, infname,
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77 frame_no);
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78 frm_out[0] = 0x44;
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79 amr_if1_pack(frm_out+1, input_bits+1, MRDTX);
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80 if (type == TX_SID_UPDATE)
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81 frm_out[5] |= 0x10;
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82 if (mode & 1)
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83 frm_out[5] |= 0x08;
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84 if (mode & 2)
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85 frm_out[5] |= 0x04;
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86 if (mode & 4)
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87 frm_out[5] |= 0x02;
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88 outlen = 6;
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89 break;
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90 case TX_NO_DATA:
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91 frm_out[0] = 0x7C;
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92 outlen = 1;
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93 break;
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94 default:
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95 fprintf(stderr, "error in %s frame #%u: invalid type\n",
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96 infname, frame_no);
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97 exit(1);
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98 }
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99 fwrite(frm_out, 1, outlen, outf);
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100 }
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101 fclose(outf);
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102 exit(0);
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103 }