FreeCalypso > hg > gsm-net-reveng

annotate trau-decode/parse-amr.c @ 78:00fd38c7c8fe

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trau-decode: factor out parse-amr.c
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 08 Feb 2025 06:22:45 +0000
parents trau-decode/parse-main.c@729dbac9df82
children 8c1f20e845a1
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1 /*
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2 * This module contains a bit of code that has been factored out of
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3 * trau-parse program; it handles AMR frames.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdint.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11
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12 static unsigned
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13 bits_to_num(bits, nbits)
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14 uint8_t *bits;
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15 unsigned nbits;
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16 {
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17 unsigned accum;
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18 unsigned n;
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19
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20 accum = 0;
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21 for (n = 0; n < nbits; n++) {
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22 accum <<= 1;
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23 if (*bits)
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24 accum |= 1;
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25 bits++;
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26 }
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27 return accum;
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28 }
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29
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30 void
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31 print_amr_frame(frame_bits)
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32 uint8_t *frame_bits;
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33 {
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34 unsigned c6_11;
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35
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36 c6_11 = bits_to_num(frame_bits + 22, 6);
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37 printf(" C6-C11: %u\n", c6_11);
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38 printf(" RIF=%u C13=%u Config_Prot=%u%u%u Msg_No=%u%u\n",
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39 frame_bits[28], frame_bits[29], frame_bits[30],
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40 frame_bits[31], frame_bits[33], frame_bits[34],
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41 frame_bits[35]);
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42 printf(" DTXd=%u TFOE=%u FClass=%u%u CMI/CMR=%u%u%u\n",
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43 frame_bits[36], frame_bits[37], frame_bits[38],
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44 frame_bits[39], frame_bits[40], frame_bits[41],
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45 frame_bits[42]);
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46 if (!frame_bits[38] && !frame_bits[39])
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47 printf(" No_Spch_Class=%u%u%u CMI=%u%u%u CMR=%u%u%u\n",
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48 frame_bits[76], frame_bits[77], frame_bits[78],
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49 frame_bits[79], frame_bits[81], frame_bits[82],
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50 frame_bits[83], frame_bits[84], frame_bits[85]);
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51 printf(" T1=%u T2=%u T3=%u T4=%u\n", frame_bits[316],
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52 frame_bits[317], frame_bits[318], frame_bits[319]);
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53 }