FreeCalypso > hg > gsm-codec-lib

annotate libtest/parse_dlcap.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents be57e06bed84
children
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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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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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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 }