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annotate hrutil/read-dec.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 2d703e1e9107
children
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1 /*
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2 * In this module we implement the utility function for reading ETSI
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3 * GSM-HR *.dec files in either LE or BE format.
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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 "../libgsmhr1/tw_gsmhr.h"
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12
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13 read_dec_frame(inf, big_endian, params, filename_for_errs, frame_no)
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14 FILE *inf;
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15 int16_t *params;
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16 char *filename_for_errs;
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17 unsigned frame_no;
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18 {
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19 uint8_t file_bytes[GSMHR_NUM_PARAMS_DEC * 2], *sp;
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20 int cc;
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21 unsigned n;
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22 uint16_t val;
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23
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24 cc = fread(file_bytes, 2, GSMHR_NUM_PARAMS_DEC, inf);
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25 if (cc == 0)
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26 return 0;
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27 if (cc != GSMHR_NUM_PARAMS_DEC) {
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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 < GSMHR_NUM_PARAMS_DEC; n++) {
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34 if (big_endian)
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35 val = ((uint16_t) sp[0] << 8) | ((uint16_t) sp[1]);
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36 else
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37 val = ((uint16_t) sp[1] << 8) | ((uint16_t) sp[0]);
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38 params[n] = val;
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39 sp += 2;
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40 }
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41 if (gsmhr_check_decoder_params(params) < 0) {
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42 fprintf(stderr,
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43 "error in %s frame #%u: wrong format or wrong endian\n",
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44 filename_for_errs, frame_no);
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45 exit(1);
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46 }
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47 return 1;
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48 }