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comparison 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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102:dd88f9312170 103:0123ca1f1402
1 /*
2 * Our gsm-efr2amr utility reads in an EFR speech recording in our
3 * extended-libgsm file format and converts it to AMR, inserting
4 * an AMR NO_DATA frame in the place of every BFI in the input
5 * but NOT performing any special handling or even detection of
6 * EFR SID frames.
7 */
8
9 #include <stdio.h>
10 #include <stdint.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <strings.h>
14 #include "../libtest/binreader.h"
15
16 extern const uint8_t amr_122_bit_order[244];
17
18 static const char amr_file_hdr[] = "#!AMR\n";
19
20 main(argc, argv)
21 char **argv;
22 {
23 FILE *inf, *outf;
24 uint8_t frm_in[BINFILE_MAX_FRAME], frm_out[32];
25 unsigned bit_a, bit_n, outlen;
26 int rc, bfi;
27
28 if (argc != 3) {
29 fprintf(stderr, "usage: %s input.gsmx output.amr\n", argv[0]);
30 exit(1);
31 }
32 inf = fopen(argv[1], "r");
33 if (!inf) {
34 perror(argv[1]);
35 exit(1);
36 }
37 outf = fopen(argv[2], "w");
38 if (!outf) {
39 perror(argv[2]);
40 exit(1);
41 }
42 for (;;) {
43 rc = binfile_read_frame(inf, frm_in);
44 if (rc < 0) {
45 fprintf(stderr, "error: garbage in %s\n", argv[1]);
46 exit(1);
47 }
48 if (!rc)
49 break;
50 if (frm_in[0] == 0xBF)
51 bfi = 1;
52 else if ((frm_in[0] & 0xF0) == 0xC0)
53 bfi = 0;
54 else {
55 fprintf(stderr,
56 "error: %s is not in EFR codec format\n",
57 argv[1]);
58 exit(1);
59 }
60 if (bfi) {
61 frm_out[0] = 0x78;
62 outlen = 1;
63 } else {
64 frm_out[0] = 0x3C;
65 bzero(frm_out + 1, 31);
66 for (bit_a = 0; bit_a < 244; bit_a++) {
67 bit_n = amr_122_bit_order[bit_a];
68 msb_set_bit(frm_out + 1, bit_a,
69 msb_get_bit(frm_in, 4 + bit_n));
70 }
71 outlen = 32;
72 }
73 fwrite(frm_out, 1, outlen, outf);
74 }
75 fclose(outf);
76 exit(0);
77 }