FreeCalypso > hg > gsm-codec-lib

annotate miscutil/pcm16-check13.c @ 556:18aca50d68df default tip

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doc/Calypso-TCH-downlink: update for FR1 BFI-with-data
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 11 Oct 2024 01:54:00 +0000
parents 6555dae764b3
children
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1 /*
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2 * This program reads a 16-bit PCM recording in raw format (robe by default,
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3 * or LE with -l option) and checks whether or not every sample fits into
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4 * left-justified 13 bits, with the 3 least significant bits of every 16-bit
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5 * sample cleared.
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6 */
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7
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8 #include <stdio.h>
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9 #include <stdint.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13
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14 main(argc, argv)
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15 char **argv;
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16 {
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17 int little_endian;
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18 char *infname;
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19 FILE *inf;
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20 unsigned sample_count;
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21 uint8_t inb[2];
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22 uint16_t ins, lowbits;
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23 int cc;
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24
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25 if (argc == 2 && argv[1][0] != '-') {
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26 little_endian = 0;
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27 infname = argv[1];
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28 } else if (argc == 3 && !strcmp(argv[1], "-l")) {
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29 little_endian = 1;
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30 infname = argv[2];
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31 } else {
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32 fprintf(stderr, "usage: %s [-l] input.pcm16\n", argv[0]);
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33 exit(1);
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34 }
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35 inf = fopen(infname, "r");
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36 if (!inf) {
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37 perror(infname);
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38 exit(1);
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39 }
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40 for (sample_count = 0; ; sample_count++) {
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41 cc = fread(inb, 1, 2, inf);
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42 if (cc <= 0)
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43 break;
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44 if (cc & 1) {
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45 fprintf(stderr, "error: %s has odd number of bytes\n",
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46 infname);
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47 exit(1);
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48 }
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49 if (little_endian)
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50 ins = ((uint16_t) inb[1] << 8) | ((uint16_t) inb[0]);
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51 else
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52 ins = ((uint16_t) inb[0] << 8) | ((uint16_t) inb[1]);
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53 lowbits = ins & 7;
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54 if (lowbits) {
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55 fprintf(stderr,
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56 "check13 fail: %s sample #%u low 3 bits are %u\n",
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57 infname, sample_count, lowbits);
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58 exit(1);
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59 }
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60 }
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61 exit(0);
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62 }