FreeCalypso > hg > gsm-codec-lib
annotate libtest/parse_dlcap.c @ 174:d284f2ac087d
doc/Utils-overview: new RTP utils
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 27 Dec 2022 00:02:28 +0000 |
parents | be57e06bed84 |
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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 } |