pvamrwbdecoder_basic_op_cequivalent.h

实现3GPP的GSM中AMR语音的CODECS。

/* ------------------------------------------------------------------
 * Copyright (C) 2008 PacketVideo
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 * -------------------------------------------------------------------
 */
/****************************************************************************************
Portions of this file are derived from the following 3GPP standard:

    3GPP TS 26.173
    ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec
    Available from http://www.3gpp.org

(C) 2007, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
Permission to distribute, modify and use this file under the standard license
terms listed above has been obtained from the copyright holder.
****************************************************************************************/
/*
------------------------------------------------------------------------------



 Pathname: ./src/pvamrwbdecoder_basic_op_cequivalent.h

     Date: 05/07/2007

------------------------------------------------------------------------------
 REVISION HISTORY

 Description:
------------------------------------------------------------------------------
 INCLUDE DESCRIPTION

------------------------------------------------------------------------------
*/
#ifndef PVAMRWBDECODER_BASIC_OP_CEQUIVALENT_H
#define PVAMRWBDECODER_BASIC_OP_CEQUIVALENT_H

#ifdef __cplusplus
extern "C"
{
#endif


#include "normalize_amr_wb.h"

#if defined(C_EQUIVALENT)


    /*----------------------------------------------------------------------------

         Function Name : add_int16

         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.

         Inputs :
          var1
                   16 bit short signed integer (int16) whose value falls in the
                   range : 0xffff 8000 <= var1 <= 0x0000 7fff.

          var2
                   16 bit short signed integer (int16) whose value falls in the
                   range : 0xffff 8000 <= var1 <= 0x0000 7fff.

         Outputs :
          none

         Return Value :
                   16 bit short signed integer (int16) whose value falls in the
                   range : 0xffff 8000 <= var_out <= 0x0000 7fff.

     ----------------------------------------------------------------------------*/
    __inline int16 add_int16(int16 var1, int16 var2)
    {
        int32 L_sum;

        L_sum = (int32) var1 + var2;
        if ((L_sum >> 15) != (L_sum >> 31))
        {
            L_sum = (L_sum >> 31) ^ MAX_16;
        }
        return ((int16)(L_sum));
    }


    /*----------------------------------------------------------------------------

         Function Name : sub_int16

          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.

         Inputs :

          var1
                   16 bit short signed integer (int16) whose value falls in the
                   range : 0xffff 8000 <= var1 <= 0x0000 7fff.

          var2
                   16 bit short signed integer (int16) whose value falls in the
                   range : 0xffff 8000 <= var1 <= 0x0000 7fff.

         Outputs :
          none

         Return Value :
                   16 bit short signed integer (int16) whose value falls in the
                   range : 0xffff 8000 <= var_out <= 0x0000 7fff.

     ----------------------------------------------------------------------------*/
    __inline int16 sub_int16(int16 var1, int16 var2)
    {
        int32 L_diff;

        L_diff = (int32) var1 - var2;
        if ((L_diff >> 15) != (L_diff >> 31))
        {
            L_diff = (L_diff >> 31) ^ MAX_16;
        }
        return ((int16)(L_diff));
    }


    /*----------------------------------------------------------------------------

         Function Name : mult_int16

          Performs the multiplication of var1 by var2 and gives a 16 bit result
          which is scaled i.e.:
                   mult_int16(var1,var2) = extract_l(L_shr((var1 times var2),15)) and
                   mult_int16(-32768,-32768) = 32767.

         Inputs :
          var1
                   16 bit short signed integer (int16) whose value falls in the
                   range : 0xffff 8000 <= var1 <= 0x0000 7fff.

          var2
                   16 bit short signed integer (int16) whose value falls in the
                   range : 0xffff 8000 <= var1 <= 0x0000 7fff.


         Return Value :
                   16 bit short signed integer (int16) whose value falls in the
                   range : 0xffff 8000 <= var_out <= 0x0000 7fff.

     ----------------------------------------------------------------------------*/

    __inline int16 mult_int16(int16 var1, int16 var2)
    {
        int32 L_product;

        L_product = ((int32) var1 * (int32) var2) >> 15;

        if ((L_product >> 15) != (L_product >> 31))
        {
            L_product = (L_product >> 31) ^ MAX_16;
        }

        return ((int16)L_product);
    }


    /*----------------------------------------------------------------------------

         Function Name : add_int32

         32 bits addition of the two 32 bits variables (L_var1+L_var2) with
         overflow control and saturation; the result is set at [phone] when
         overflow occurs or at -2147483648 when underflow occurs.

         Inputs :

          L_var1   32 bit long signed integer (int32) whose value falls in the
                   range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.

          L_var2   32 bit long signed integer (int32) whose value falls in the
                   range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.


         Return Value :
          L_var_out
                   32 bit long signed integer (int32) whose value falls in the
                   range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.

     ----------------------------------------------------------------------------*/


    __inline  int32 add_int32(int32 L_var1, int32 L_var2)
    {
        int32 L_var_out;

        L_var_out = L_var1 + L_var2;

        if (((L_var1 ^ L_var2) & MIN_32) == 0)  /* same sign ? */
        {
            if ((L_var_out ^ L_var1) & MIN_32)  /* addition matches sign ? */
            {
                L_var_out = (L_var1 >> 31) ^ MAX_32;
            }
        }
        return (L_var_out);
    }




    /*----------------------------------------------------------------------------

         Function Name : sub_int32

         32 bits subtraction of the two 32 bits variables (L_var1-L_var2) with
         overflow control and saturation; the result is set at [phone] when
         overflow occurs or at -2147483648 when underflow occurs.

         Inputs :

          L_var1   32 bit long signed integer (int32) whose value falls in the
                   range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.

          L_var2   32 bit long signed integer (int32) whose value falls in the
                   range : 0x8000 0000 <= L_var3 <= 0x7fff ffff.


         Return Value :
          L_var_out
                   32 bit long signed integer (int32) whose value falls in the
                   range : 0x8000 0000 <= L_var_out <= 0x7fff ffff.

     ----------------------------------------------------------------------------*/


    __inline  int32 sub_int32(int32 L_var1, int32 L_var2)
    {
        int32 L_var_out;

        L_var_out = L_var1 - L_var2;

        if (((L_var1 ^ L_var2) & MIN_32) != 0)  /* different sign ? */
        {