| |
| /* |
| ** 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__ |
| |
| |