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annotate amrconv/cod-read.c @ 480:332397bc80aa

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doc/AMR-library-API: document public const data items
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 23:18:17 +0000
parents 0beafaa0623f
children
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1 /*
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2 * In this module we implement utility functions for reading ETSI/3GPP
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3 * *.cod files (AMR version) 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 "amr_defs.h"
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10
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11 read_cod_bits(inf, big_endian, bitvec, filename_for_errs)
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12 FILE *inf;
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13 uint8_t *bitvec;
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14 char *filename_for_errs;
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15 {
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16 uint8_t file_bytes[COD_FORMAT_NWORDS * 2], *sp;
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17 int cc;
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18 unsigned n, upper;
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19
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20 cc = fread(file_bytes, 2, COD_FORMAT_NWORDS, inf);
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21 if (cc == 0)
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22 return 0;
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23 if (cc != COD_FORMAT_NWORDS) {
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24 fprintf(stderr, "error: short read from %s\n",
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25 filename_for_errs);
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26 exit(1);
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27 }
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28 sp = file_bytes;
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29 for (n = 0; n < COD_FORMAT_NWORDS; n++) {
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30 if (big_endian) {
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31 upper = sp[0];
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32 bitvec[n] = sp[1];
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33 } else {
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34 bitvec[n] = sp[0];
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35 upper = sp[1];
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36 }
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37 if (upper && (sp[0] != 0xFF || sp[1] != 0xFF)) {
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38 fprintf(stderr,
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39 "error in %s: non-zero in what should be %s upper byte\n",
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40 filename_for_errs, big_endian ? "BE" : "LE");
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41 exit(1);
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42 }
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43 sp += 2;
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44 }
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45 return 1;
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46 }
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47
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48 void
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49 preen_frame_bits(input_bits, nbits, filename_for_errs, frame_no)
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50 uint8_t *input_bits;
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51 char *filename_for_errs;
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52 unsigned nbits, frame_no;
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53 {
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54 uint8_t *sp;
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55 unsigned nb;
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56
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57 sp = input_bits;
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58 for (nb = 0; nb < nbits; nb++) {
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59 if (*sp > 1) {
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60 fprintf(stderr, "error in %s frame #%u: data bit > 1\n",
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61 filename_for_errs, frame_no);
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62 exit(1);
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63 }
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64 sp++;
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65 }
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66 }