FreeCalypso > hg > gsm-codec-lib

annotate libtest/parse_dlcap.c @ 237:e4a4bf11f37c

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doc/PCM8-conversions: document command line utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 08 May 2023 04:29:05 +0000
parents be57e06bed84
children
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7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
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1 /*
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2 * All TCH/F downlink capture files produced by fc-shell tch record
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3 * (both FR and EFR, both old and new formats) include the same
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4 * 81-character block in each line: 3 DSP status words followed by
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5 * 33 bytes of frame data. Here we are factoring out the function
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6 * for parsing this common part.
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7 */
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8
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9 #include <ctype.h>
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10 #include <stdint.h>
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11
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12 static
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13 decode_hex_digit(ch)
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14 {
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15 if (isdigit(ch))
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16 return(ch - '0');
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17 else if (isupper(ch))
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18 return(ch - 'A' + 10);
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19 else
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20 return(ch - 'a' + 10);
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21 }
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22
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23 parse_dlcap_common(line, status_words, tidsp_bytes)
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24 char *line;
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25 uint16_t *status_words;
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26 uint8_t *tidsp_bytes;
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27 {
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28 char *cp;
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29 int i;
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30
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31 /* grok DSP status words */
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32 cp = line;
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33 for (i = 0; i < 3; i++) {
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34 if (!isxdigit(cp[0]) || !isxdigit(cp[1]) ||
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35 !isxdigit(cp[2]) || !isxdigit(cp[3]))
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36 return -1;
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37 status_words[i] = (decode_hex_digit(cp[0]) << 12) |
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38 (decode_hex_digit(cp[1]) << 8) |
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39 (decode_hex_digit(cp[2]) << 4) |
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40 decode_hex_digit(cp[3]);
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41 cp += 4;
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42 if (*cp++ != ' ')
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43 return -1;
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44 }
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45 /* read the frame bits */
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46 for (i = 0; i < 33; i++) {
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47 if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
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48 return -1;
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49 tidsp_bytes[i] = (decode_hex_digit(cp[0]) << 4) |
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50 decode_hex_digit(cp[1]);
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51 cp += 2;
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52 }
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53 return 0;
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54 }