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annotate amrdiff/readone-amr.c @ 2:75ba83624a29

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readone-amr program written
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 03 Apr 2024 19:41:45 +0000
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75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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2 * This program reads a single frame (the first one) from an AMR *.cod file,
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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3 * enforces that this frame is MR122 speech, and emits the frame of 244 bits
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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4 * as comma-separated ASCII. The intent is to extract the DHF in a form
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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5 * convenient for inclusion in amrdiff source.
75ba83624a29 readone-amr program written
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6 */
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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7
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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8 #include <stdio.h>
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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9 #include <stdint.h>
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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10 #include <stdlib.h>
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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11 #include <string.h>
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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12 #include <strings.h>
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Mychaela Falconia <falcon@freecalypso.org>
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13 #include "amr_defs.h"
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14
75ba83624a29 readone-amr program written
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15 main(argc, argv)
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Mychaela Falconia <falcon@freecalypso.org>
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16 char **argv;
75ba83624a29 readone-amr program written
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17 {
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Mychaela Falconia <falcon@freecalypso.org>
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18 char *filename;
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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19 int bigend, rc;
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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20 FILE *inf;
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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21 uint8_t amr_bits[COD_FORMAT_NWORDS];
75ba83624a29 readone-amr program written
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22
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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23 if (argc != 3) {
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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24 usage: fprintf(stderr, "usage: %s amr-cod-file be|le\n", argv[0]);
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25 exit(1);
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26 }
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Mychaela Falconia <falcon@freecalypso.org>
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27 filename = argv[1];
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Mychaela Falconia <falcon@freecalypso.org>
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28 if (!strcmp(argv[2], "be"))
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29 bigend = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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30 else if (!strcmp(argv[2], "le"))
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31 bigend = 0;
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32 else
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Mychaela Falconia <falcon@freecalypso.org>
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33 goto usage;
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Mychaela Falconia <falcon@freecalypso.org>
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34 inf = fopen(filename, "r");
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35 if (!inf) {
75ba83624a29 readone-amr program written
Mychaela Falconia <falcon@freecalypso.org>
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36 perror(filename);
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37 exit(1);
75ba83624a29 readone-amr program written
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38 }
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Mychaela Falconia <falcon@freecalypso.org>
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39 rc = read_etsi_bits(inf, bigend, amr_bits, COD_FORMAT_NWORDS, filename);
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40 if (!rc) {
75ba83624a29 readone-amr program written
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41 fprintf(stderr, "error: %s is empty\n", filename);
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42 exit(1);
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43 }
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Mychaela Falconia <falcon@freecalypso.org>
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44 if (amr_bits[0] != TX_SPEECH_GOOD || amr_bits[245] != MR122) {
75ba83624a29 readone-amr program written
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45 fprintf(stderr, "error: frame type is wrong\n");
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46 exit(1);
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47 }
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Mychaela Falconia <falcon@freecalypso.org>
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48 emit_frame244(amr_bits + 1);
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49 exit(0);
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50 }