FreeCalypso > hg > gsm-codec-lib
annotate libgsmfrp/sidclass.c @ 202:0faf23a9286f
libgsmefr/reorder.c: perf opt
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 04 Jan 2023 04:54:02 +0000 |
parents | 2b5770c715ee |
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rev | line source |
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libgsmfrp: compiling utility functions
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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 "gsm_fr_preproc.h" |
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9 |
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10 static const unsigned short sid_field_bits[95] = { |
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11 57, 58, 60, 61, 63, 64, 66, 67, 69, 70, 72, 73, |
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12 75, 76, 78, 79, 81, 82, 84, 85, 87, 88, 90, 91, |
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13 93, 94, 113, 114, 116, 117, 119, 120, 122, 123, |
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14 125, 126, 128, 129, 131, 132, 134, 135, 137, |
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15 138, 140, 141, 143, 144, 146, 147, 149, 150, |
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16 169, 170, 172, 173, 175, 176, 178, 179, 181, |
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17 182, 184, 185, 187, 188, 190, 191, 193, 194, |
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18 196, 197, 199, 200, 202, 203, 205, 206, 225, |
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19 226, 228, 229, 231, 232, 234, 235, 237, 240, |
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20 243, 246, 249, 252, 255, 258, 261 |
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21 }; |
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22 |
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23 static inline int get_bit(const gsm_byte *frame, unsigned bitnum) |
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24 { |
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25 unsigned bytenum = bitnum >> 3; |
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26 unsigned bit_in_byte = 7 - (bitnum & 7); |
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27 unsigned bitmask = 1 << bit_in_byte; |
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28 |
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29 if (frame[bytenum] & bitmask) |
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30 return 1; |
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31 else |
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32 return 0; |
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33 } |
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34 |
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35 int gsmfr_preproc_sid_classify(const gsm_byte *frame) |
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36 { |
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37 unsigned idx, n; |
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38 |
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39 n = 0; |
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40 for (idx = 0; idx < 95; idx++) { |
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41 if (get_bit(frame, sid_field_bits[idx])) |
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42 n++; |
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43 if (n >= 16) |
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44 return 0; |
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45 } |
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46 if (n < 2) |
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47 return 2; |
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48 else |
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49 return 1; |
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50 } |