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annotate miscutil/amrts-pcm8-compact.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents 7c50864deaff
children
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7c50864deaff amrts-pcm8-compact program written
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
7c50864deaff amrts-pcm8-compact program written
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2 * The set of AMR test sequences shipped by 3GPP as TS 26.074 includes
7c50864deaff amrts-pcm8-compact program written
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3 * not only linear PCM (13-bit left-justified) and AMR-encoded files,
7c50864deaff amrts-pcm8-compact program written
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4 * but also 8-bit PCM sequences in both A-law and mu-law. However,
7c50864deaff amrts-pcm8-compact program written
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5 * those PCM8 sequences are shipped in a stupid and inconvenient format:
7c50864deaff amrts-pcm8-compact program written
Mychaela Falconia <falcon@freecalypso.org>
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6 * each 8-bit PCM sample is expanded to a 16-bit word, written in LE
7c50864deaff amrts-pcm8-compact program written
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7 * byte order. This utility converts a PCM8 test sequence file
7c50864deaff amrts-pcm8-compact program written
Mychaela Falconia <falcon@freecalypso.org>
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8 * from this weird format into sane PCM8 format with one byte per sample.
7c50864deaff amrts-pcm8-compact program written
Mychaela Falconia <falcon@freecalypso.org>
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9 * For this conversion, it does not matter whether the PCM8 test sequence
7c50864deaff amrts-pcm8-compact program written
Mychaela Falconia <falcon@freecalypso.org>
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10 * in question is A-law or mu-law.
7c50864deaff amrts-pcm8-compact program written
Mychaela Falconia <falcon@freecalypso.org>
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11 */
7c50864deaff amrts-pcm8-compact program written
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12
7c50864deaff amrts-pcm8-compact program written
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13 #include <stdio.h>
7c50864deaff amrts-pcm8-compact program written
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14 #include <stdlib.h>
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15
7c50864deaff amrts-pcm8-compact program written
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16 main(argc, argv)
7c50864deaff amrts-pcm8-compact program written
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17 char **argv;
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18 {
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19 FILE *inf, *outf;
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20 int cdat, cpad;
7c50864deaff amrts-pcm8-compact program written
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21
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22 if (argc != 3) {
7c50864deaff amrts-pcm8-compact program written
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23 fprintf(stderr, "usage: %s in-file out-file\n", argv[0]);
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24 exit(1);
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25 }
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26 inf = fopen(argv[1], "r");
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27 if (!inf) {
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28 perror(argv[1]);
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29 exit(1);
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30 }
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31 outf = fopen(argv[2], "w");
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32 if (!outf) {
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33 perror(argv[2]);
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34 exit(1);
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35 }
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36 for (;;) {
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37 cdat = getc(inf);
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38 if (cdat < 0)
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39 break;
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40 cpad = getc(inf);
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41 if (cpad < 0) {
7c50864deaff amrts-pcm8-compact program written
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42 fprintf(stderr, "error: %s has odd length\n", argv[1]);
7c50864deaff amrts-pcm8-compact program written
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43 exit(1);
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44 }
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45 if (cpad != 0) {
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46 fprintf(stderr,
7c50864deaff amrts-pcm8-compact program written
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47 "error: presumed padding byte in %s is not 0\n",
7c50864deaff amrts-pcm8-compact program written
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48 argv[1]);
7c50864deaff amrts-pcm8-compact program written
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49 exit(1);
7c50864deaff amrts-pcm8-compact program written
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50 }
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51 putc(cdat, outf);
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52 }
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53 fclose(outf);
7c50864deaff amrts-pcm8-compact program written
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54 exit(0);
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55 }