FreeCalypso > hg > gsm-codec-lib

comparison amrconv/amr2efr.c @ 184:b092a510141e

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tree reorg: move gsm-amr2efr & gsm-efr2amr to amrconv subdir
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 02:33:45 +0000
parents miscutil/amr2efr.c@41f1ae68d253
children
comparison
equal deleted inserted replaced
183:452c1d5a6268 184:b092a510141e
1 /*
2 * Our gsm-amr2efr utility reads in a speech recording in .amr format
3 * (the mode must be MR122 for every frame, no DTX) and converts it into
4 * our ad hoc .gsmx format for EFR. The conversion is a bit reshuffling
5 * only, no transcoding takes place.
6 */
7
8 #include <stdio.h>
9 #include <stdint.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <strings.h>
13
14 extern const uint8_t amr_122_bit_order[244];
15
16 static const char amr_file_hdr[] = "#!AMR\n";
17
18 main(argc, argv)
19 char **argv;
20 {
21 char *infname, *outfname;
22 FILE *inf, *outf;
23 int wrong_flag, hdrb;
24 uint8_t frm_in[31], frm_out[31];
25 unsigned bit_a, bit_n;
26
27 if (argc == 3 && argv[1][0] != '-') {
28 wrong_flag = 0;
29 infname = argv[1];
30 outfname = argv[2];
31 } else if (argc == 4 && !strcmp(argv[1], "-w")) {
32 wrong_flag = 1;
33 infname = argv[2];
34 outfname = argv[3];
35 } else {
36 fprintf(stderr, "usage: %s [-w] input.amr output.gsmx\n",
37 argv[0]);
38 exit(1);
39 }
40 inf = fopen(infname, "r");
41 if (!inf) {
42 perror(infname);
43 exit(1);
44 }
45 if (fread(frm_in, 1, 6, inf) != 6 || bcmp(frm_in, amr_file_hdr, 6)) {
46 fprintf(stderr, "error: %s is not in AMR format\n", infname);
47 exit(1);
48 }
49 outf = fopen(outfname, "w");
50 if (!outf) {
51 perror(outfname);
52 exit(1);
53 }
54 for (;;) {
55 hdrb = getc(inf);
56 if (hdrb < 0)
57 break;
58 if ((hdrb & 0x78) != 0x38) {
59 fprintf(stderr, "error: unexpected content in %s\n",
60 infname);
61 exit(1);
62 }
63 if (fread(frm_in, 1, 31, inf) != 31) {
64 fprintf(stderr, "error: short read from %s\n", infname);
65 exit(1);
66 }
67 frm_out[0] = 0xC0;
68 for (bit_a = 0; bit_a < 244; bit_a++) {
69 if (wrong_flag)
70 bit_n = bit_a;
71 else
72 bit_n = amr_122_bit_order[bit_a];
73 msb_set_bit(frm_out, 4 + bit_n,
74 msb_get_bit(frm_in, bit_a));
75 }
76 fwrite(frm_out, 1, 31, outf);
77 }
78 fclose(outf);
79 exit(0);
80 }