FreeCalypso > hg > vband-misc

annotate amrdiff/etsi-bit-rd.c @ 25:1f58ba0d79a4

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pcmu2efr: brown paper bag
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 12 May 2024 04:34:15 +0000
parents a03c87a2abc6
children
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a03c87a2abc6 amrdiff program written
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1 /*
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2 * The utility function in this module reads the bits from ETSI *.cod
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3 * files, both AMR and EFR versions, either LE or BE.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdint.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include "etsi.h"
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12 #include "amr_defs.h"
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13
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14 read_etsi_bits(inf, big_endian, bitvec, nwords, filename_for_errs)
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15 FILE *inf;
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16 uint8_t *bitvec;
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17 unsigned nwords;
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18 char *filename_for_errs;
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19 {
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20 uint8_t file_bytes[COD_FORMAT_NWORDS * 2], *sp;
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21 int cc;
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22 unsigned n, upper;
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23
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24 cc = fread(file_bytes, 2, nwords, inf);
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25 if (cc == 0)
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26 return 0;
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27 if (cc != nwords) {
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28 fprintf(stderr, "error: short read from %s\n",
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29 filename_for_errs);
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30 exit(1);
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31 }
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32 sp = file_bytes;
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33 for (n = 0; n < nwords; n++) {
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34 if (big_endian) {
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35 upper = sp[0];
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36 bitvec[n] = sp[1];
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37 } else {
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38 bitvec[n] = sp[0];
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39 upper = sp[1];
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40 }
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41 if (upper && (sp[0] != 0xFF || sp[1] != 0xFF)) {
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42 fprintf(stderr,
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43 "error in %s: non-zero in what should be %s upper byte\n",
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44 filename_for_errs, big_endian ? "BE" : "LE");
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45 exit(1);
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46 }
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47 sp += 2;
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48 }
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49 return 1;
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50 }