语音压缩

开发平台：
C/C++

BASIC_OP.C：源码内容
							/* Version 3.3    Last modified: December 26, 1995 */
/*___________________________________________________________________________
 |                                                                           |
 | Basics operators.                                                         |
 |___________________________________________________________________________|
*/
/*___________________________________________________________________________
 |                                                                           |
 |   Include-Files                                                           |
 |___________________________________________________________________________|
*/
#include <stdio.h>
#include <stdlib.h>
#include "typedef.h"
#include "basic_op.h"
/*___________________________________________________________________________
 |                                                                           |
 |   Local Functions                                                         |
 |___________________________________________________________________________|
*/
Word16 sature(Word32 L_var1);
/*___________________________________________________________________________
 |                                                                           |
 |   Constants and Globals                                                   |
 |___________________________________________________________________________|
*/
Flag Overflow =0;
Flag Carry =0;
/*___________________________________________________________________________
 |                                                                           |
 |   Functions                                                               |
 |___________________________________________________________________________|
*/
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : sature                                                  |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |    Limit the 32 bit input to the range of a 16 bit word.                  |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1                                                                 |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var1 <= 0x7fff ffff.                 |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 sature(Word32 L_var1)
  {
   Word16 var_out;
   if (L_var1 > 0X00007fffL)
     {
      Overflow = 1;
      var_out = MAX_16;
     }
   else if (L_var1 < (Word32)0xffff8000L)
     {
      Overflow = 1;
      var_out = MIN_16;
     }
   else
     {
      Overflow = 0;
      var_out = extract_l(L_var1);
     }
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : add                                                     |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |    Performs the addition (var1+var2) with overflow control and saturation;|
 |    the 16 bit result is set at +32767 when overflow occurs or at -32768   |
 |    when underflow occurs.                                                 |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 add(Word16 var1,Word16 var2)
  {
   Word16 var_out;
   Word32 L_somme;
   L_somme = (Word32) var1 + var2;
   var_out = sature(L_somme);
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : sub                                                     |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |    Performs the subtraction (var1+var2) with overflow control and satu-   |
 |    ration; the 16 bit result is set at +32767 when overflow occurs or at  |
 |    -32768 when underflow occurs.                                          |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 sub(Word16 var1,Word16 var2)
  {
   Word16 var_out;
   Word32 L_diff;
   L_diff = (Word32) var1 - var2;
   var_out = sature(L_diff);
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : abs_s                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |    Absolute value of var1; abs_s(-32768) = 32767.                         |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0x0000 0000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 abs_s(Word16 var1)
  {
   Word16 var_out;
   if (var1 == (Word16)0X8000 )
     {
      var_out = MAX_16;
     }
   else
     {
      if (var1 < 0)
        {
         var_out = -var1;
        }
      else
        {
         var_out = var1;
        }
      }
    return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : shl                                                     |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Arithmetically shift the 16 bit input var1 left var2 positions.Zero fill|
 |   the var2 LSB of the result. If var2 is negative, arithmetically shift   |
 |   var1 right by -var2 with sign extension. Saturate the result in case of |
 |   underflows or overflows.                                                |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 shl(Word16 var1,Word16 var2)
  {
   Word16 var_out;
   Word32 resultat;
   if (var2 < 0)
     {
      var_out = shr(var1,-var2);
     }
   else
     {
      resultat = (Word32) var1 * ((Word32) 1 << var2);
     if ((var2 > 15 && var1 != 0) || (resultat != (Word32)((Word16) resultat)))
        {
         Overflow = 1;
         var_out = (var1 > 0) ? MAX_16 : MIN_16;
        }
      else
        {
         var_out = extract_l(resultat);
        }
     }
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : shr                                                     |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Arithmetically shift the 16 bit input var1 right var2 positions with    |
 |   sign extension. If var2 is negative, arithmetically shift var1 left by  |
 |   -var2 with sign extension. Saturate the result in case of underflows or |
 |   overflows.                                                              |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 shr(Word16 var1,Word16 var2)
  {
   Word16 var_out;
   if (var2 < 0)
     {
      var_out = shl(var1,-var2);
     }
   else
     {
      if (var2 >= 15)
        {
         var_out = (var1 < 0) ? (Word16)(-1) : (Word16)0;
        }
      else
        {
         if (var1 < 0)
           {
     var_out = ~(( ~var1) >> var2 );
           }
         else
           {
            var_out = var1 >> var2;
           }
        }
     }
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : mult                                                    |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |    Performs the multiplication of var1 by var2 and gives a 16 bit result  |
 |    which is scaled i.e.:                                                  |
 |             mult(var1,var2) = shr((var1 times var2),15) and               |
 |             mult(-32768,-32768) = 32767.                                  |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 mult(Word16 var1, Word16 var2)
  {
   Word16 var_out;
   Word32 L_produit;
   L_produit = (Word32)var1 * (Word32)var2;
   L_produit = (L_produit & (Word32) 0xffff8000L) >> 15;
   if (L_produit & (Word32) 0x00010000L)
     L_produit = L_produit | (Word32) 0xffff0000L;
   var_out = sature(L_produit);
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_mult                                                  |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   L_mult is the 32 bit result of the multiplication of var1 times var2    |
 |   with one shift left i.e.:                                               |
 |        L_mult(var1,var2) = shl((var1 times var2),1) and                   |
 |        L_mult(-32768,-32768) = 2147483647.                                |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |___________________________________________________________________________|
*/
Word32 L_mult(Word16 var1,Word16 var2)
  {
   Word32 L_var_out;
   L_var_out = (Word32)var1 * (Word32)var2;
   if (L_var_out != (Word32)0x40000000L)
     {
      L_var_out *= 2;
     }
   else
     {
      Overflow = 1;
      L_var_out = MAX_32;
     }
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : negate                                                  |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Negate var1 with saturation, saturate in the case where input is -32768:|
 |                negate(var1) = sub(0,var1).                                |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 negate(Word16 var1)
  {
   Word16 var_out;
   var_out = (var1 == MIN_16) ? MAX_16 : -var1;
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : extract_h                                               |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Return the 16 MSB of L_var1.                                            |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1                                                                 |
 |             32 bit long signed integer (Word32 ) whose value falls in the |
 |             range : 0x8000 0000 <= L_var1 <= 0x7fff ffff.                 |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 extract_h(Word32 L_var1)
  {
   Word16 var_out;
   var_out = (Word16) (L_var1 >> 16);
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : extract_l                                               |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Return the 16 LSB of L_var1.                                            |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1                                                                 |
 |             32 bit long signed integer (Word32 ) whose value falls in the |
 |             range : 0x8000 0000 <= L_var1 <= 0x7fff ffff.                 |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 extract_l(Word32 L_var1)
  {
   Word16 var_out;
   var_out = (Word16) L_var1;
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : round                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Round the lower 16 bits of the 32 bit input number into its MS 16 bits  |
 |   with saturation. Shift the resulting bits right by 16 and return the 16 |
 |   bit number:                                                             |
 |               round(L_var1) = extract_h(L_add(L_var1,32768))              |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1                                                                 |
 |             32 bit long signed integer (Word32 ) whose value falls in the |
 |             range : 0x8000 0000 <= L_var1 <= 0x7fff ffff.                 |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 round(Word32 L_var1)
  {
   Word16 var_out;
   Word32 L_arrondi;
   L_arrondi = L_add(L_var1, (Word32)0x00008000);
   var_out = extract_h(L_arrondi);
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_mac                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Multiply var1 by var2 and shift the result left by 1. Add the 32 bit    |
 |   result to L_var3 with saturation, return a 32 bit result:               |
 |        L_mac(L_var3,var1,var2) = L_add(L_var3,(L_mult(var1,var2)).        |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var3   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |___________________________________________________________________________|
*/
Word32 L_mac(Word32 L_var3, Word16 var1, Word16 var2)
  {
   Word32 L_var_out;
   Word32 L_produit;
   L_produit = L_mult(var1,var2);
   L_var_out = L_add(L_var3,L_produit);
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_msu                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Multiply var1 by var2 and shift the result left by 1. Subtract the 32   |
 |   bit result to L_var3 with saturation, return a 32 bit result:           |
 |        L_msu(L_var3,var1,var2) = L_sub(L_var3,(L_mult(var1,var2)).        |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var3   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |___________________________________________________________________________|
*/
Word32 L_msu(Word32 L_var3, Word16 var1, Word16 var2)
  {
   Word32 L_var_out;
   Word32 L_produit;
   L_produit = L_mult(var1,var2);
   L_var_out = L_sub(L_var3,L_produit);
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_macNs                                                 |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Multiply var1 by var2 and shift the result left by 1. Add the 32 bit    |
 |   result to L_var3 without saturation, return a 32 bit result. Generate   |
 |   carry and overflow values :                                             |
 |        L_macNs(L_var3,var1,var2) = L_add_c(L_var3,(L_mult(var1,var2)).    |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var3   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |                                                                           |
 |   Caution :                                                               |
 |                                                                           |
 |    In some cases the Carry flag has to be cleared or set before using op- |
 |    rators which take into account its value.                              |
 |___________________________________________________________________________|
*/
Word32 L_macNs(Word32 L_var3, Word16 var1, Word16 var2)
  {
   Word32 L_var_out;
   L_var_out = L_mult(var1,var2);
   L_var_out = L_add_c(L_var3,L_var_out);
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_msuNs                                                 |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Multiply var1 by var2 and shift the result left by 1. Subtract the 32   |
 |   bit result from L_var3 without saturation, return a 32 bit result. Ge-  |
 |   nerate carry and overflow values :                                      |
 |        L_msuNs(L_var3,var1,var2) = L_sub_c(L_var3,(L_mult(var1,var2)).    |
 |                                                                           |
 |   Complexity weight : 1                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var3   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |                                                                           |
 |   Caution :                                                               |
 |                                                                           |
 |    In some cases the Carry flag has to be cleared or set before using op- |
 |    rators which take into account its value.                              |
 |___________________________________________________________________________|
*/
Word32 L_msuNs(Word32 L_var3, Word16 var1, Word16 var2)
  {
   Word32 L_var_out;
   L_var_out = L_mult(var1,var2);
   L_var_out = L_sub_c(L_var3,L_var_out);
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_add                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   32 bits addition of the two 32 bits variables (L_var1+L_var2) with      |
 |   overflow control and saturation; the result is set at +214783647 when   |
 |   overflow occurs or at -214783648 when underflow occurs.                 |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    L_var2   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |___________________________________________________________________________|
*/
Word32 L_add(Word32 L_var1, Word32 L_var2)
  {
   Word32 L_var_out;
   L_var_out = L_var1 + L_var2;
   if (((L_var1 ^ L_var2) & MIN_32) == 0)
     {
      if ((L_var_out ^ L_var1) & MIN_32)
        {
         L_var_out = (L_var1 < 0) ? MIN_32 : MAX_32;
         Overflow = 1;
        }
     }
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_sub                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   32 bits subtraction of the two 32 bits variables (L_var1-L_var2) with   |
 |   overflow control and saturation; the result is set at +214783647 when   |
 |   overflow occurs or at -214783648 when underflow occurs.                 |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    L_var2   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |___________________________________________________________________________|
*/
Word32 L_sub(Word32 L_var1, Word32 L_var2)
  {
   Word32 L_var_out;
   L_var_out = L_var1 - L_var2;
   if (((L_var1 ^ L_var2) & MIN_32) != 0)
     {
      if ((L_var_out ^ L_var1) & MIN_32)
        {
         L_var_out = (L_var1 < 0L) ? MIN_32 : MAX_32;
         Overflow = 1;
        }
     }
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_add_c                                                 |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Performs 32 bits addition of the two 32 bits variables (L_var1+L_var2+C)|
 |   with carry. No saturation. Generate carry and Overflow values. The car- |
 |   ry and overflow values are binary variables which can be tested and as- |
 |   signed values.                                                          |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    L_var2   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |                                                                           |
 |   Caution :                                                               |
 |                                                                           |
 |    In some cases the Carry flag has to be cleared or set before using op- |
 |    rators which take into account its value.                              |
 |___________________________________________________________________________|
*/
Word32 L_add_c(Word32 L_var1, Word32 L_var2)
  {
   Word32 L_var_out;
   Word32 L_test;
   Flag carry_int = 0;
   L_var_out = L_var1 + L_var2 + Carry;
   L_test = L_var1 + L_var2;
   if ((L_var1>0) && (L_var2 >0) && (L_test < 0))
     {
      Overflow = 1;
      carry_int = 0;
     }
   else
     {
      if ((L_var1<0) && (L_var2 <0) && (L_test >0))
        {
         Overflow = 1;
         carry_int = 1;
        }
      else
        {
         if (((L_var1 ^ L_var2) < 0) && (L_test > 0))
           {
            Overflow = 0;
            carry_int = 1;
           }
         else
           {
            Overflow = 0;
            carry_int = 0;
           }
        }
     }
   if (Carry)
     {
      if (L_test == MAX_32)
        {
         Overflow = 1;
         Carry = carry_int;
        }
      else
        {
         if (L_test == (Word32) 0xFFFFFFFFL)
           {
            Carry = 1;
           }
         else
           {
            Carry = carry_int;
           }
        }
     }
   else
     {
      Carry = carry_int;
     }
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_sub_c                                                 |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Performs 32 bits subtraction of the two 32 bits variables with carry    |
 |   (borrow) : L_var1-L_var2-C. No saturation. Generate carry and Overflow  |
 |   values. The carry and overflow values are binary variables which can    |
 |   be tested and assigned values.                                          |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    L_var2   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |                                                                           |
 |   Caution :                                                               |
 |                                                                           |
 |    In some cases the Carry flag has to be cleared or set before using op- |
 |    rators which take into account its value.                              |
 |___________________________________________________________________________|
*/
Word32 L_sub_c(Word32 L_var1, Word32 L_var2)
  {
   Word32 L_var_out;
   Word32 L_test;
   Flag carry_int = 0;
   if (Carry)
     {
      Carry = 0;
      if (L_var2 != MIN_32)
        {
         L_var_out = L_add_c(L_var1,-L_var2);
        }
      else
        {
         L_var_out = L_var1 - L_var2;
         if (L_var1 > 0L)
           {
            Overflow = 1;
            Carry = 0;
           }
        }
     }
   else
     {
      L_var_out = L_var1 - L_var2 - (Word32)0X00000001;
      L_test = L_var1 - L_var2;
      if ((L_test < 0) && (L_var1 > 0) && (L_var2 < 0))
        {
         Overflow = 1;
         carry_int = 0;
        }
      else if ((L_test > 0) && (L_var1 < 0) && (L_var2 > 0))
        {
         Overflow = 1;
         carry_int = 1;
        }
      else if ((L_test > 0) && ((L_var1 ^ L_var2) > 0))
        {
         Overflow = 0;
         carry_int = 1;
        }
      if (L_test == MIN_32)
        {
         Overflow = 1;
         Carry = carry_int;
        }
      else
        {
         Carry = carry_int;
        }
     }
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_negate                                                |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Negate the 32 bit variable L_var1 with saturation; saturate in the case |
 |   where input is -2147483648 (0x8000 0000).                               |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |___________________________________________________________________________|
*/
Word32 L_negate(Word32 L_var1)
  {
   Word32 L_var_out;
   L_var_out = (L_var1 == MIN_32) ? MAX_32 : -L_var1;
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : mult_r                                                  |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Same as mult with rounding, i.e.:                                       |
 |     mult_r(var1,var2) = shr(((var1*var2) + 16384),15) and                 |
 |     mult_r(-32768,-32768) = 32767.                                        |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 mult_r(Word16 var1, Word16 var2)
  {
   Word16 var_out;
   Word32 L_produit_arr;
   L_produit_arr = (Word32)var1 * (Word32)var2; /* product */
   L_produit_arr += (Word32) 0x00004000;        /* round */
   L_produit_arr &= (Word32) 0xffff8000L;
   L_produit_arr >>= 15;                        /* shift */
   if (L_produit_arr & (Word32) 0x00010000L)   /* sign extend when necessary */
     {
      L_produit_arr |= (Word32) 0xffff0000L;
     }
   var_out = sature(L_produit_arr);
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_shl                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Arithmetically shift the 32 bit input L_var1 left var2 positions. Zero  |
 |   fill the var2 LSB of the result. If var2 is negative, L_var1 right by   |
 |   -var2 arithmetically shift with sign extension. Saturate the result in  |
 |   case of underflows or overflows.                                        |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |___________________________________________________________________________|
*/
Word32 L_shl(Word32 L_var1, Word16 var2)
{
   Word32 L_var_out;
   /* initialization used only to suppress Microsoft Visual C++ warnings */
   L_var_out = 0L;
   if (var2 <= 0)
     {
      L_var_out = L_shr(L_var1,-var2);
     }
   else
     {
      for(;var2>0;var2--)
        {
         if (L_var1 > (Word32) 0X3fffffffL)
           {
            Overflow = 1;
            L_var_out = MAX_32;
            break;
           }
         else
           {
            if (L_var1 < (Word32) 0xc0000000L)
              {
               Overflow = 1;
               L_var_out = MIN_32;
               break;
              }
           }
         L_var1 *= 2;
         L_var_out = L_var1;
        }
     }
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_shr                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Arithmetically shift the 32 bit input L_var1 right var2 positions with  |
 |   sign extension. If var2 is negative, arithmetically shift L_var1 left   |
 |   by -var2 and zero fill the var2 LSB of the result. Saturate the result  |
 |   in case of underflows or overflows.                                     |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.              |
 |___________________________________________________________________________|
*/
Word32 L_shr(Word32 L_var1, Word16 var2)
  {
   Word32 L_var_out;
   if (var2 < 0)
     {
      L_var_out = L_shl(L_var1,-var2);
     }
   else
     {
      if (var2 >= 31)
        {
         L_var_out = (L_var1 < 0L) ? -1 : 0;
        }
      else
        {
         if (L_var1<0)
           {
            L_var_out = ~((~L_var1) >> var2);
           }
        else
          {
           L_var_out = L_var1 >> var2;
          }
        }
     }
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : shr_r                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Same as shr(var1,var2) but with rounding. Saturate the result in case of|
 |   underflows or overflows :                                               |
 |    If var2 is greater than zero :                                         |
 |       shr_r(var1,var2) = shr(add(var1,2**(var2-1)),var2)                  |
 |    If var2 is less than zero :                                            |
 |       shr_r(var1,var2) = shr(var1,var2).                                  |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word16 shr_r(Word16 var1, Word16 var2)
  {
   Word16 var_out;
   if (var2>15)
     {
      var_out = 0;
     }
   else
     {
      var_out = shr(var1,var2);
      if (var2 > 0)
        {
         if ((var1 & ((Word16)1 << (var2-1))) != 0)
           {
            var_out++;
           }
        }
     }
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : mac_r                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Multiply var1 by var2 and shift the result left by 1. Add the 32 bit    |
 |   result to L_var3 with saturation. Round the LS 16 bits of the result    |
 |   into the MS 16 bits with saturation and shift the result right by 16.   |
 |   Return a 16 bit result.                                                 |
 |            mac_r(L_var3,var1,var2) = round(L_mac(Lvar3,var1,var2))        |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var3   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0x0000 8000 <= L_var_out <= 0x0000 7fff.              |
 |___________________________________________________________________________|
*/
Word16 mac_r(Word32 L_var3, Word16 var1, Word16 var2)
  {
   Word16 var_out;
   L_var3 = L_mac(L_var3,var1,var2);
   L_var3 = L_add(L_var3, (Word32) 0x00008000);
   var_out = extract_h(L_var3);
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : msu_r                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Multiply var1 by var2 and shift the result left by 1. Subtract the 32   |
 |   bit result to L_var3 with saturation. Round the LS 16 bits of the res-  |
 |   ult into the MS 16 bits with saturation and shift the result right by   |
 |   16. Return a 16 bit result.                                             |
 |            msu_r(L_var3,var1,var2) = round(L_msu(Lvar3,var1,var2))        |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var3   32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.                 |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0x0000 8000 <= L_var_out <= 0x0000 7fff.              |
 |___________________________________________________________________________|
*/
Word16 msu_r(Word32 L_var3, Word16 var1, Word16 var2)
  {
   Word16 var_out;
   L_var3 = L_msu(L_var3,var1,var2);
   L_var3 = L_add(L_var3, (Word32) 0x00008000);
   var_out = extract_h(L_var3);
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_deposit_h                                             |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Deposit the 16 bit var1 into the 16 MS bits of the 32 bit output. The   |
 |   16 LS bits of the output are zeroed.                                    |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= var_out <= 0x7fff 0000.                |
 |___________________________________________________________________________|
*/
Word32 L_deposit_h(Word16 var1)
  {
   Word32 L_var_out;
   L_var_out = (Word32) var1 << 16;
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_deposit_l                                             |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Deposit the 16 bit var1 into the 16 LS bits of the 32 bit output. The   |
 |   16 MS bits of the output are sign extended.                             |
 |                                                                           |
 |   Complexity weight : 2                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0xFFFF 8000 <= var_out <= 0x0000 7fff.                |
 |___________________________________________________________________________|
*/
Word32 L_deposit_l(Word16 var1)
  {
   Word32 L_var_out;
   L_var_out = (Word32) var1;
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_shr_r                                                 |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Same as L_shr(L_var1,var2)but with rounding. Saturate the result in case|
 |   of underflows or overflows :                                            |
 |    If var2 is greater than zero :                                         |
 |       L_shr_r(var1,var2) = L_shr(L_add(L_var1,2**(var2-1)),var2)          |
 |    If var2 is less than zero :                                            |
 |       L_shr_r(var1,var2) = L_shr(L_var1,var2).                            |
 |                                                                           |
 |   Complexity weight : 3                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1                                                                 |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= var1 <= 0x7fff ffff.                   |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= var_out <= 0x7fff ffff.                |
 |___________________________________________________________________________|
*/
Word32 L_shr_r(Word32 L_var1,Word16 var2)
  {
   Word32 L_var_out;
   if (var2 > 31)
     {
      L_var_out = 0;
     }
   else
     {
      L_var_out = L_shr(L_var1,var2);
      if (var2 > 0)
        {
         if ( (L_var1 & ( (Word32)1 << (var2-1) )) != 0)
           {
            L_var_out++;
           }
        }
     }
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_abs                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |    Absolute value of L_var1; Saturate in case where the input is          |
 |                                                               -214783648  |
 |                                                                           |
 |   Complexity weight : 3                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1                                                                 |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= var1 <= 0x7fff ffff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x0000 0000 <= var_out <= 0x7fff ffff.                |
 |___________________________________________________________________________|
*/
Word32 L_abs(Word32 L_var1)
  {
   Word32 L_var_out;
   if (L_var1 == MIN_32)
     {
      L_var_out = MAX_32;
     }
   else
     {
      if (L_var1 < 0)
        {
         L_var_out = -L_var1;
        }
      else
        {
         L_var_out = L_var1;
        }
     }
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : L_sat                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |    32 bit L_var1 is set to 2147833647 if an overflow occurred or to       |
 |    -214783648 if an underflow occurred on the most recent L_add_c, L_sub_c|
 |    L_macNs or LmsuNs operations. The carry and overflow values are binary |
 |    values which can be tested and assigned values.                        |
 |                                                                           |
 |   Complexity weight : 4                                                   |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1                                                                 |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= var1 <= 0x7fff ffff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    L_var_out                                                              |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= var_out <= 0x7fff ffff.                |
 |___________________________________________________________________________|
*/
Word32 L_sat (Word32 L_var1)
  {
   Word32 L_var_out;
   L_var_out = L_var1;
   if (Overflow)
     {
      if (Carry)
        {
         L_var_out = MIN_32;
        }
      else
        {
         L_var_out = MAX_32;
        }
      Carry = 0;
      Overflow = 0;
     }
   return(L_var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : norm_s                                                  |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Produces the number of left shift needed to normalize the 16 bit varia- |
 |   ble var1 for positive values on the interval with minimum of 16384 and  |
 |   maximum of 32767, and for negative values on the interval with minimum  |
 |   of -32768 and maximum of -16384; in order to normalize the result, the  |
 |   following operation must be done :                                      |
 |                    norm_var1 = shl(var1,norm_s(var1)).                    |
 |                                                                           |
 |   Complexity weight : 15                                                  |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0xffff 8000 <= var1 <= 0x0000 7fff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0x0000 0000 <= var_out <= 0x0000 000f.                |
 |___________________________________________________________________________|
*/
Word16 norm_s(Word16 var1)
  {
   Word16 var_out;
   if (var1 == 0)
     {
      var_out = 0;
     }
   else
     {
      if (var1 == (Word16) 0xffff)
        {
         var_out = 15;
        }
      else
        {
         if (var1 < 0)
           {
            var1 = ~var1;
           }
         for(var_out = 0; var1 < 0x4000; var_out++)
           {
            var1 <<= 1;
           }
        }
     }
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : div_s                                                   |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Produces a result which is the fractional  integer division of var1 by  |
 |   var2; var1 and var2 must be positive and var2 must be greater or equal  |
 |   to var1; the result is positive (leading bit equal to 0) and truncated  |
 |   to 16 bits.                                                             |
 |   If var1 = var2 then div(var1,var2) = 32767.                             |
 |                                                                           |
 |   Complexity weight : 18                                                  |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    var1                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0x0000 0000 <= var1 <= var2 and var2 != 0.            |
 |                                                                           |
 |    var2                                                                   |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : var1 <= var2 <= 0x0000 7fff and var2 != 0.            |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0x0000 0000 <= var_out <= 0x0000 7fff.                |
 |             It's a Q15 value (point between b15 and b14).                 |
 |___________________________________________________________________________|
*/
Word16 div_s(Word16 var1, Word16 var2)
  {
   Word16 var_out = 0;
   Word16 iteration;
   Word32 L_num;
   Word32 L_denom;
   if ((var1 > var2) || (var1 < 0) || (var2 < 0))
     {
      printf("Division Error var1=%d  var2=%dn",var1,var2);
      exit(0);
     }
   if (var2 == 0)
     {
      printf("Division by 0, Fatal error n");
      exit(0);
     }
   if (var1 == 0)
     {
      var_out = 0;
     }
   else
     {
      if (var1 == var2)
        {
         var_out = MAX_16;
        }
      else
        {
         L_num = L_deposit_l(var1);
         L_denom = L_deposit_l(var2);
         for(iteration=0;iteration<15;iteration++)
           {
            var_out <<=1;
            L_num <<= 1;
            if (L_num >= L_denom)
              {
               L_num = L_sub(L_num,L_denom);
               var_out = add(var_out,1);
              }
           }
        }
     }
   return(var_out);
  }
/*___________________________________________________________________________
 |                                                                           |
 |   Function Name : norm_l                                                  |
 |                                                                           |
 |   Purpose :                                                               |
 |                                                                           |
 |   Produces the number of left shift needed to normalize the 32 bit varia- |
 |   ble l_var1 for positive values on the interval with minimum of          |
 |   1073741824 and maximum of 2147483647, and for negative values on the in-|
 |   terval with minimum of -2147483648 and maximum of -1073741824; in order |
 |   to normalize the result, the following operation must be done :         |
 |                   norm_L_var1 = L_shl(L_var1,norm_l(L_var1)).             |
 |                                                                           |
 |   Complexity weight : 30                                                  |
 |                                                                           |
 |   Inputs :                                                                |
 |                                                                           |
 |    L_var1                                                                 |
 |             32 bit long signed integer (Word32) whose value falls in the  |
 |             range : 0x8000 0000 <= var1 <= 0x7fff ffff.                   |
 |                                                                           |
 |   Outputs :                                                               |
 |                                                                           |
 |    none                                                                   |
 |                                                                           |
 |   Return Value :                                                          |
 |                                                                           |
 |    var_out                                                                |
 |             16 bit short signed integer (Word16) whose value falls in the |
 |             range : 0x0000 0000 <= var_out <= 0x0000 001f.                |
 |___________________________________________________________________________|
*/
Word16 norm_l(Word32 L_var1)
  {
   Word16 var_out;
   if (L_var1 == 0)
     {
      var_out = 0;
     }
   else
     {
      if (L_var1 == (Word32)0xffffffffL)
        {
         var_out = 31;
        }
      else
        {
         if (L_var1 < 0)
           {
            L_var1 = ~L_var1;
           }
         for(var_out = 0;L_var1 < (Word32)0x40000000L;var_out++)
           {
            L_var1 <<= 1;
           }
        }
     }
   return(var_out);
  }

						