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      1 /*
      2  * Copyright (C) 2003 - 2016 Sony Corporation
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "ldac.h"
     18 
     19 
     20 /*******************************************************************************
     21     Subfunction: Check Saturation
     22 *******************************************************************************/
     23 __inline static INT32 check_sature_ldac(
     24 INT64 val)
     25 {
     26 
     27     return (INT32)val;
     28 }
     29 
     30 /*******************************************************************************
     31     Shift and Round
     32 *******************************************************************************/
     33 DECLFUNC INT32 sftrnd_ldac(
     34 INT32 in,
     35 int shift)
     36 {
     37     INT64 out;
     38 
     39     if (shift > 0) {
     40         out = ((INT64)in + ((INT64)1 << (shift-1))) >> shift;
     41     }
     42     else {
     43         out = (INT64)in << (-shift);
     44     }
     45 
     46     return check_sature_ldac(out);
     47 }
     48 
     49 
     50 /*******************************************************************************
     51     Get Bit Length of Value
     52 *******************************************************************************/
     53 DECLFUNC int get_bit_length_ldac(
     54 INT32 val)
     55 {
     56     int len;
     57 
     58     len = 0;
     59     while (val > 0) {
     60         val >>= 1;
     61         len++;
     62     }
     63 
     64     return len;
     65 }
     66 
     67 /*******************************************************************************
     68     Get Maximum Absolute Value
     69 *******************************************************************************/
     70 DECLFUNC INT32 get_absmax_ldac(
     71 INT32 *p_x,
     72 int num)
     73 {
     74     int i;
     75     INT32 abmax, val;
     76 
     77     abmax = abs(p_x[0]);
     78     for (i = 1; i < num; i++) {
     79         val = abs(p_x[i]);
     80         if (abmax < val) {
     81             abmax = val;
     82         }
     83     }
     84 
     85     return abmax;
     86 }
     87 
     88