FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/oper_32b.h @ 477:4c9222d95647
libtwamr encoder: always emit frame->mode = mode;
In the original implementation of amr_encode_frame(), the 'mode' member
of the output struct was set to 0xFF if the output frame type is TX_NO_DATA.
This design was made to mimic the mode field (16-bit word) being set to
0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends
on this struct member being set in any way, and amr_frame_to_tseq()
generates the needed 0xFFFF on its own, based on frame->type being equal
to TX_NO_DATA.
It is simpler and more efficient to always set frame->mode to the actual
encoding mode in amr_encode_frame(), and this new behavior has already
been documented in doc/AMR-library-API description in anticipation of
the present change.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 18 May 2024 22:30:42 +0000 |
parents | 3da7ab45910d |
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rev | line source |
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1 /* Double precision operations */ |
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2 |
348
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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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Mychaela Falconia <falcon@freecalypso.org>
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24 /***************************************************************************** |
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25 * * |
3da7ab45910d
libgsmefr: inline L_Comp() and L_Extract()
Mychaela Falconia <falcon@freecalypso.org>
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26 * Function L_Comp() * |
3da7ab45910d
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27 * * |
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Mychaela Falconia <falcon@freecalypso.org>
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28 * Compose from two 16 bit DPF a 32 bit integer. * |
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29 * * |
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libgsmefr: inline L_Comp() and L_Extract()
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30 * L_32 = hi<<16 + lo<<1 * |
3da7ab45910d
libgsmefr: inline L_Comp() and L_Extract()
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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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libgsmefr: inline L_Comp() and L_Extract()
Mychaela Falconia <falcon@freecalypso.org>
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39 * 32 bit long signed integer (Word32) whose value falls in the * |
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libgsmefr: inline L_Comp() and L_Extract()
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40 * range : 0x8000 0000 <= L_32 <= 0x7fff fff0. * |
3da7ab45910d
libgsmefr: inline L_Comp() and L_Extract()
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41 * * |
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libgsmefr: inline L_Comp() and L_Extract()
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42 ***************************************************************************** |
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Mychaela Falconia <falcon@freecalypso.org>
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43 */ |
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Mychaela Falconia <falcon@freecalypso.org>
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44 |
3da7ab45910d
libgsmefr: inline L_Comp() and L_Extract()
Mychaela Falconia <falcon@freecalypso.org>
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45 static inline Word32 L_Comp (Word16 hi, Word16 lo) |
3da7ab45910d
libgsmefr: inline L_Comp() and L_Extract()
Mychaela Falconia <falcon@freecalypso.org>
parents:
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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); |