media/libstagefright/codecs/amrwbenc/inc/log2.h

/*
 ** Copyright 2003-2010, VisualOn, Inc.
 **
 ** 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.
 */


/********************************************************************************
*
*      File             : log2.h
*      Purpose          : Computes log2(L_x)
*
********************************************************************************
*/
#ifndef __LOG2_H__
#define __LOG2_H__

/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include "typedef.h"

/*
********************************************************************************
*                         DEFINITION OF DATA TYPES
********************************************************************************
*/

/*
********************************************************************************
*                         DECLARATION OF PROTOTYPES
********************************************************************************
*/
void Log2 (
        Word32 L_x,        /* (i) : input value                                 */
        Word16 *exponent,  /* (o) : Integer part of Log2.   (range: 0<=val<=30) */
        Word16 *fraction   /* (o) : Fractional part of Log2. (range: 0<=val<1)*/
      );

void Log2_norm (
        Word32 L_x,         /* (i) : input value (normalized)                    */
        Word16 exp,         /* (i) : norm_l (L_x)                                */
        Word16 *exponent,   /* (o) : Integer part of Log2.   (range: 0<=val<=30) */
        Word16 *fraction    /* (o) : Fractional part of Log2. (range: 0<=val<1)  */
           );

#endif  //__LOG2_H__