86 lines
4.6 KiB
C
86 lines
4.6 KiB
C
/*
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* Project 25 IMBE Encoder/Decoder Fixed-Point implementation
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* Developed by Pavel Yazev E-mail: pyazev@gmail.com
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* Version 1.0 (c) Copyright 2009
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* The software is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Boston, MA
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* 02110-1301, USA.
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*/
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/*___________________________________________________________________________
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| Constants and Globals |
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| $Id $
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|___________________________________________________________________________|
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*/
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extern Flag Overflow;
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extern Flag Carry;
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#define MAX_32 (Word32)0x7fffffffL
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#define MIN_32 (Word32)0x80000000L
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#define MAX_16 (Word16)0x7fff
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#define MIN_16 (Word16)0x8000
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/*___________________________________________________________________________
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| Prototypes for basic arithmetic operators |
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|___________________________________________________________________________|
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*/
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Word16 add (Word16 var1, Word16 var2); /* Short add, 1 */
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Word16 sub (Word16 var1, Word16 var2); /* Short sub, 1 */
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Word16 abs_s (Word16 var1); /* Short abs, 1 */
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Word16 shl (Word16 var1, Word16 var2); /* Short shift left, 1 */
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Word16 shr (Word16 var1, Word16 var2); /* Short shift right, 1 */
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Word16 mult (Word16 var1, Word16 var2); /* Short mult, 1 */
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Word32 L_mult (Word16 var1, Word16 var2); /* Long mult, 1 */
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Word16 negate (Word16 var1); /* Short negate, 1 */
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Word16 extract_h (Word32 L_var1); /* Extract high, 1 */
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Word16 extract_l (Word32 L_var1); /* Extract low, 1 */
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Word16 round (Word32 L_var1); /* Round, 1 */
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Word32 L_mac (Word32 L_var3, Word16 var1, Word16 var2); /* Mac, 1 */
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Word32 L_msu (Word32 L_var3, Word16 var1, Word16 var2); /* Msu, 1 */
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Word32 L_macNs (Word32 L_var3, Word16 var1, Word16 var2); /* Mac without
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sat, 1 */
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Word32 L_msuNs (Word32 L_var3, Word16 var1, Word16 var2); /* Msu without
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sat, 1 */
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Word32 L_add (Word32 L_var1, Word32 L_var2); /* Long add, 2 */
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Word32 L_sub (Word32 L_var1, Word32 L_var2); /* Long sub, 2 */
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Word32 L_add_c (Word32 L_var1, Word32 L_var2); /* Long add with c, 2 */
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Word32 L_sub_c (Word32 L_var1, Word32 L_var2); /* Long sub with c, 2 */
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Word32 L_negate (Word32 L_var1); /* Long negate, 2 */
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Word16 mult_r (Word16 var1, Word16 var2); /* Mult with round, 2 */
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Word32 L_shl (Word32 L_var1, Word16 var2); /* Long shift left, 2 */
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Word32 L_shr (Word32 L_var1, Word16 var2); /* Long shift right, 2*/
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Word16 shr_r (Word16 var1, Word16 var2); /* Shift right with
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round, 2 */
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Word16 mac_r (Word32 L_var3, Word16 var1, Word16 var2); /* Mac with
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rounding,2 */
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Word16 msu_r (Word32 L_var3, Word16 var1, Word16 var2); /* Msu with
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rounding,2 */
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Word32 L_deposit_h (Word16 var1); /* 16 bit var1 -> MSB, 2 */
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Word32 L_deposit_l (Word16 var1); /* 16 bit var1 -> LSB, 2 */
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Word32 L_shr_r (Word32 L_var1, Word16 var2); /* Long shift right with
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round, 3 */
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Word32 L_abs (Word32 L_var1); /* Long abs, 3 */
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Word32 L_sat (Word32 L_var1); /* Long saturation, 4 */
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Word16 norm_s (Word16 var1); /* Short norm, 15 */
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Word16 div_s (Word16 var1, Word16 var2); /* Short division, 18 */
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Word16 norm_l (Word32 L_var1); /* Long norm, 30 */
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