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comparison miscutil/amrts-pcm8-compact.c @ 469:7c50864deaff

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amrts-pcm8-compact program written
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 13 May 2024 21:06:58 +0000
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468:4104b0390fab 469:7c50864deaff
1 /*
2 * The set of AMR test sequences shipped by 3GPP as TS 26.074 includes
3 * not only linear PCM (13-bit left-justified) and AMR-encoded files,
4 * but also 8-bit PCM sequences in both A-law and mu-law. However,
5 * those PCM8 sequences are shipped in a stupid and inconvenient format:
6 * each 8-bit PCM sample is expanded to a 16-bit word, written in LE
7 * byte order. This utility converts a PCM8 test sequence file
8 * from this weird format into sane PCM8 format with one byte per sample.
9 * For this conversion, it does not matter whether the PCM8 test sequence
10 * in question is A-law or mu-law.
11 */
12
13 #include <stdio.h>
14 #include <stdlib.h>
15
16 main(argc, argv)
17 char **argv;
18 {
19 FILE *inf, *outf;
20 int cdat, cpad;
21
22 if (argc != 3) {
23 fprintf(stderr, "usage: %s in-file out-file\n", argv[0]);
24 exit(1);
25 }
26 inf = fopen(argv[1], "r");
27 if (!inf) {
28 perror(argv[1]);
29 exit(1);
30 }
31 outf = fopen(argv[2], "w");
32 if (!outf) {
33 perror(argv[2]);
34 exit(1);
35 }
36 for (;;) {
37 cdat = getc(inf);
38 if (cdat < 0)
39 break;
40 cpad = getc(inf);
41 if (cpad < 0) {
42 fprintf(stderr, "error: %s has odd length\n", argv[1]);
43 exit(1);
44 }
45 if (cpad != 0) {
46 fprintf(stderr,
47 "error: presumed padding byte in %s is not 0\n",
48 argv[1]);
49 exit(1);
50 }
51 putc(cdat, outf);
52 }
53 fclose(outf);
54 exit(0);
55 }