FreeCalypso > hg > rtp-debug-utils

annotate pcm-study/pcm-frag-extr.c @ 12:b5e73d5ebcd1

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pcm-frag-extr program written
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 15 May 2024 02:50:50 +0000
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12
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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2 * This program extracts a fragment of some N 160-sample frames from a G.711
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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3 * recording file, starting at an arbitrary offset that may not be frame-
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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4 * aligned, and saves this fragment to a new binary file.
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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5 */
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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6
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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7 #include <stdio.h>
b5e73d5ebcd1 pcm-frag-extr program written
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8 #include <stdint.h>
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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9 #include <stdlib.h>
b5e73d5ebcd1 pcm-frag-extr program written
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10
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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11 main(argc, argv)
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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12 char **argv;
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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13 {
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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14 FILE *inf, *outf;
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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15 u_long start_offset;
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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16 unsigned n, nframes;
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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17 uint8_t buf[160];
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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18 int cc;
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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19
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Mychaela Falconia <falcon@freecalypso.org>
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20 if (argc != 5) {
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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21 fprintf(stderr,
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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22 "usage: %s pcm-src-file start-offset N-frames pcm-out-file\n",
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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23 argv[0]);
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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24 exit(1);
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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25 }
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Mychaela Falconia <falcon@freecalypso.org>
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26 inf = fopen(argv[1], "r");
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Mychaela Falconia <falcon@freecalypso.org>
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27 if (!inf) {
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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28 perror(argv[1]);
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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29 exit(1);
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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30 }
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Mychaela Falconia <falcon@freecalypso.org>
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31 start_offset = strtoul(argv[2], 0, 0);
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Mychaela Falconia <falcon@freecalypso.org>
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32 fseek(inf, start_offset, SEEK_SET);
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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33 nframes = strtoul(argv[3], 0, 0);
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Mychaela Falconia <falcon@freecalypso.org>
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34 outf = fopen(argv[4], "w");
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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35 if (!outf) {
b5e73d5ebcd1 pcm-frag-extr program written
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36 perror(argv[4]);
b5e73d5ebcd1 pcm-frag-extr program written
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37 exit(1);
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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38 }
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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39 for (n = 0; n < nframes; n++) {
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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40 cc = fread(buf, 1, 160, inf);
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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41 if (cc > 0)
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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42 fwrite(buf, 1, cc, outf);
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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43 if (cc < 160) {
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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44 fprintf(stderr, "warning: short read from %s\n",
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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45 argv[1]);
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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46 break;
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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47 }
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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48 }
b5e73d5ebcd1 pcm-frag-extr program written
Mychaela Falconia <falcon@freecalypso.org>
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49 exit(0);
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50 }