normalize_amr_wb.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: ./c/include/normalize_amr_wb.h

     Date: 12/10/2004

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

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

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

#ifndef NORMALIZE_AMR_WB_H
#define NORMALIZE_AMR_WB_H


/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/

#include "pv_amr_wb_type_defs.h"

/*----------------------------------------------------------------------------
; MACROS
; Define module specific macros here
----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------
; EXTERNAL VARIABLES REFERENCES
----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------
; DEFINES AND SIMPLE TYPEDEF'S
----------------------------------------------------------------------------*/

#if defined(_ARM_V5)

__inline int16 normalize_amr_wb(int32 x)
{
    int32 y;
    __asm
    {
        clz y, x;
        sub y, y, #1
    }
    return (y);
}


#elif defined(_ARM_GCC)


__inline int16 normalize_amr_wb(int32 x)
{
    register int32 y;
    register int32 ra = x;


    asm volatile(
        "clz %0, %1\n\t"
        "sub %0, %0, #1"
    : "=&r*i"(y)
                : "r"(ra));
    return (y);

}

#else

#ifdef __cplusplus
extern "C"
{
#endif

    int16 normalize_amr_wb(int32 x);

#ifdef __cplusplus
}
#endif

#endif



#endif  /* PV_NORMALIZE_H */