1e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard 2e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard/* 3e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** Copyright 2003-2010, VisualOn, Inc. 4e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** 5e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** Licensed under the Apache License, Version 2.0 (the "License"); 6e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** you may not use this file except in compliance with the License. 7e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** You may obtain a copy of the License at 8e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** 9e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** http://www.apache.org/licenses/LICENSE-2.0 10e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** 11e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** Unless required by applicable law or agreed to in writing, software 12e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** distributed under the License is distributed on an "AS IS" BASIS, 13e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** See the License for the specific language governing permissions and 15e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ** limitations under the License. 16e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard */ 17e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard 18e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard 19e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard/******************************************************************************** 20e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard* 21e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard* File : log2.h 22e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard* Purpose : Computes log2(L_x) 23e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard* 24e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard******************************************************************************** 25e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard*/ 26e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard#ifndef __LOG2_H__ 27e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard#define __LOG2_H__ 28b676a05348e4c516fa8b57e33b10548e6142c3f8Mans Rullgard 29e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard/* 30e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard******************************************************************************** 31e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard* INCLUDE FILES 32e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard******************************************************************************** 33e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard*/ 34e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard#include "typedef.h" 35b676a05348e4c516fa8b57e33b10548e6142c3f8Mans Rullgard 36e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard/* 37e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard******************************************************************************** 38e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard* DEFINITION OF DATA TYPES 39e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard******************************************************************************** 40e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard*/ 41b676a05348e4c516fa8b57e33b10548e6142c3f8Mans Rullgard 42e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard/* 43e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard******************************************************************************** 44e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard* DECLARATION OF PROTOTYPES 45e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard******************************************************************************** 46e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard*/ 47e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgardvoid Log2 ( 48e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard Word32 L_x, /* (i) : input value */ 49e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard Word16 *exponent, /* (o) : Integer part of Log2. (range: 0<=val<=30) */ 50e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard Word16 *fraction /* (o) : Fractional part of Log2. (range: 0<=val<1)*/ 51e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ); 52e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard 53e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgardvoid Log2_norm ( 54e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard Word32 L_x, /* (i) : input value (normalized) */ 55e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard Word16 exp, /* (i) : norm_l (L_x) */ 56e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard Word16 *exponent, /* (o) : Integer part of Log2. (range: 0<=val<=30) */ 57e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard Word16 *fraction /* (o) : Fractional part of Log2. (range: 0<=val<1) */ 58e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard ); 59e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard 60e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard#endif //__LOG2_H__ 61e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard 62e2e838afcf03e603a41a0455846eaf9614537c16Mans Rullgard 63