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 *******************************************************************************/
check_sature_ldac(INT64 val)23 __inline static INT32 check_sature_ldac(
24 INT64 val)
25 {
26 
27     return (INT32)val;
28 }
29 
30 /*******************************************************************************
31     Shift and Round
32 *******************************************************************************/
sftrnd_ldac(INT32 in,int shift)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 *******************************************************************************/
get_bit_length_ldac(INT32 val)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 *******************************************************************************/
get_absmax_ldac(INT32 * p_x,int num)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