FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/oper_32b.h @ 537:f9eefb61fb2f

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frtest: new program gsmfr-decode-tw5
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 21 Sep 2024 23:31:25 +0000
parents 3da7ab45910d
children
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36e1363ad885 libgsmefr: initial import of ETSI header files
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1 /* Double precision operations */
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2
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3 /*****************************************************************************
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4 * *
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5 * Function L_Extract() *
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6 * *
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7 * Extract from a 32 bit integer two 16 bit DPF. *
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8 * *
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9 * Arguments: *
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10 * *
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11 * L_32 : 32 bit integer. *
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12 * 0x8000 0000 <= L_32 <= 0x7fff ffff. *
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13 * hi : b16 to b31 of L_32 *
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14 * lo : (L_32 - hi<<16)>>1 *
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15 *****************************************************************************
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16 */
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17
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18 static inline void L_Extract (Word32 L_32, Word16 *hi, Word16 *lo)
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19 {
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20 *hi = L_32 >> 16;
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21 *lo = (L_32 & 0xFFFF) >> 1;
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22 }
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23
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24 /*****************************************************************************
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25 * *
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26 * Function L_Comp() *
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27 * *
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28 * Compose from two 16 bit DPF a 32 bit integer. *
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29 * *
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30 * L_32 = hi<<16 + lo<<1 *
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31 * *
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32 * Arguments: *
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33 * *
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34 * hi msb *
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35 * lo lsf (with sign) *
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36 * *
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37 * Return Value : *
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38 * *
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39 * 32 bit long signed integer (Word32) whose value falls in the *
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40 * range : 0x8000 0000 <= L_32 <= 0x7fff fff0. *
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41 * *
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42 *****************************************************************************
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43 */
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44
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45 static inline Word32 L_Comp (Word16 hi, Word16 lo)
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46 {
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47 return ((Word32) hi << 16) + ((Word32) lo << 1);
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48 }
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49
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50 Word32 Mpy_32 (Word16 hi1, Word16 lo1, Word16 hi2, Word16 lo2);
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51 Word32 Mpy_32_16 (Word16 hi, Word16 lo, Word16 n);
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52 Word32 Div_32 (Word32 L_num, Word16 denom_hi, Word16 denom_lo);