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annotate libgsmfr2/sidclass.c @ 282:9ee8ad3d4d30

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frtest: rm gsmfr-hand-test and gsmfr-max-out utils These hack programs were never properly documented and were written only as part of a debug chase, in pursuit of a bug that ultimately turned out to be in our then-hacky patch to osmo-bts-sysmo, before beginning of proper patches in Osmocom. These hack programs need to be dropped from the present sw package because they depend on old libgsm, and we are eliminating that dependency.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 05:44:47 +0000
parents a33edf624061
children
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1 /*
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2 * gsmfr_preproc_sid_classify() utility function classifies
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3 * a GSM 06.10 frame in RTP encoding according to the rules
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4 * of GSM 06.31 (or 3GPP TS 46.031) section 6.1.1, judging it
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5 * as SID=0, SID=1 or SID=2.
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6 */
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7
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8 #include <stdint.h>
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9 #include "tw_gsmfr.h"
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11 static const unsigned short sid_field_bits[95] = {
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12 57, 58, 60, 61, 63, 64, 66, 67, 69, 70, 72, 73,
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13 75, 76, 78, 79, 81, 82, 84, 85, 87, 88, 90, 91,
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14 93, 94, 113, 114, 116, 117, 119, 120, 122, 123,
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15 125, 126, 128, 129, 131, 132, 134, 135, 137,
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16 138, 140, 141, 143, 144, 146, 147, 149, 150,
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17 169, 170, 172, 173, 175, 176, 178, 179, 181,
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19 196, 197, 199, 200, 202, 203, 205, 206, 225,
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22 };
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24 static inline int get_bit(const uint8_t *frame, unsigned bitnum)
2
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25 {
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26 unsigned bytenum = bitnum >> 3;
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27 unsigned bit_in_byte = 7 - (bitnum & 7);
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28 unsigned bitmask = 1 << bit_in_byte;
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29
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30 if (frame[bytenum] & bitmask)
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31 return 1;
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32 else
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33 return 0;
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34 }
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36 int gsmfr_preproc_sid_classify(const uint8_t *frame)
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37 {
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38 unsigned idx, n;
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39
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40 n = 0;
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41 for (idx = 0; idx < 95; idx++) {
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42 if (get_bit(frame, sid_field_bits[idx]))
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43 n++;
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44 if (n >= 16)
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45 return 0;
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46 }
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47 if (n < 2)
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48 return 2;
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49 else
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50 return 1;
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51 }