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annotate miscutil/pcm16-check13.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +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 }