/* | |
** 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__ | |