FreeCalypso > hg > gsm-codec-lib

annotate amrconv/ietf2cod.c @ 494:aaf4dec8bee0

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libgsmhr1: implement perfect SID detection
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 17 Jun 2024 23:14:19 +0000
parents 1a7d659a952f
children
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1 /*
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2 * This program converts an AMR-encoded speech recording from the common
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3 * IETF RFC 4867 .amr format into the 3GPP test sequence .cod format.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdint.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include "amr_defs.h"
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12
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13 extern unsigned amr_bit_lengths[9];
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14 extern const char amr_file_hdr[IETF_HDR_LEN];
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15 extern const uint8_t extra_bytes_per_ft[9];
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16
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17 static void
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18 bits2words(ser_bits, cod_words, nbits)
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19 uint8_t *ser_bits;
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20 uint16_t *cod_words;
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21 unsigned nbits;
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22 {
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23 uint8_t *sp = ser_bits;
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24 uint16_t *dp = cod_words;
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25 unsigned n;
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26
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27 for (n = 0; n < nbits; n++)
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28 *dp++ = *sp++;
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29 for (; n < MAX_SERIAL_SIZE; n++)
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30 *dp++ = 0;
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31 }
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32
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33 main(argc, argv)
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34 char **argv;
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35 {
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36 char *infname, *outfname;
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37 FILE *inf, *outf;
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38 uint8_t frm_in[MAX_IF1_BYTES];
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39 unsigned frame_no, mode, qbit, sti, sid_mode;
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40 uint8_t ser_bits[MAX_SERIAL_SIZE];
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41 uint16_t cod_words[COD_FORMAT_NWORDS];
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42 int rc;
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43
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44 if (argc != 3) {
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45 fprintf(stderr, "usage: %s input.amr output.cod\n", argv[0]);
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46 exit(1);
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47 }
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48 infname = argv[1];
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49 outfname = argv[2];
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50 inf = fopen(infname, "r");
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51 if (!inf) {
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52 perror(infname);
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53 exit(1);
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54 }
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55 if (fread(frm_in, 1, IETF_HDR_LEN, inf) != IETF_HDR_LEN ||
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56 bcmp(frm_in, amr_file_hdr, IETF_HDR_LEN)) {
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57 fprintf(stderr, "error: %s is not in IETF AMR format\n",
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58 infname);
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59 exit(1);
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60 }
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61 outf = fopen(outfname, "w");
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62 if (!outf) {
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63 perror(outfname);
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64 exit(1);
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65 }
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66 /* padding words which will never be filled */
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67 bzero(cod_words + MAX_SERIAL_SIZE + 2, sizeof(uint16_t) * 4);
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68 for (frame_no = 0; ; frame_no++) {
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69 rc = getc(inf);
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70 if (rc < 0)
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71 break;
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72 mode = (rc & 0x78) >> 3;
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73 qbit = (rc & 4) >> 2;
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74 if (mode == MODE_NO_DATA) {
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75 cod_words[0] = TX_NO_DATA;
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76 bzero(cod_words+1, sizeof(uint16_t) * MAX_SERIAL_SIZE);
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77 cod_words[245] = 0xFFFF;
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78 goto output;
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79 }
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80 if (mode > MRDTX) {
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81 fprintf(stderr, "error in frame #%u: invalid FT=%u\n",
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82 frame_no, mode);
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83 exit(1);
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84 }
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85 rc = fread(frm_in, 1, extra_bytes_per_ft[mode], inf);
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86 if (rc != extra_bytes_per_ft[mode]) {
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87 fprintf(stderr,
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88 "error: short read from %s on frame #%u\n",
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89 infname, frame_no);
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90 exit(1);
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91 }
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92 amr_if1_unpack(frm_in, ser_bits, mode);
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93 if (mode == MRDTX) {
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94 sti = (frm_in[4] & 0x10) >> 4;
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95 sid_mode = 0;
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96 if (frm_in[4] & 0x08)
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97 sid_mode |= 1;
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98 if (frm_in[4] & 0x04)
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99 sid_mode |= 2;
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100 if (frm_in[4] & 0x02)
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101 sid_mode |= 4;
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102 }
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103 bits2words(ser_bits, cod_words + 1, amr_bit_lengths[mode]);
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104 if (mode == MRDTX) {
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105 if (qbit)
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106 cod_words[0] = sti ? TX_SID_UPDATE
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107 : TX_SID_FIRST;
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108 else
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109 cod_words[0] = TX_SID_BAD;
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110 cod_words[245] = sid_mode;
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111 } else {
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112 cod_words[0] = qbit ? TX_SPEECH_GOOD : TX_SPEECH_BAD;
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113 cod_words[245] = mode;
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114 }
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115 output: fwrite(cod_words, 2, COD_FORMAT_NWORDS, outf);
115
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116 }
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117 fclose(outf);
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118 exit(0);
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119 }