1 /*
2 * Copyright (c) 2011-2015, Intel Corporation
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation and/or
13 * other materials provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors
16 * may be used to endorse or promote products derived from this software without
17 * specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "LogarithmicParameterAdaptation.h"
32 #include <cmath>
33 #include <limits>
34 #include <algorithm>
35
36 #define base CLinearParameterAdaptation
37
CLogarithmicParameterAdaptation()38 CLogarithmicParameterAdaptation::CLogarithmicParameterAdaptation() : base("Logarithmic")
39 {
40 static_assert(std::numeric_limits<double>::is_iec559,
41 "Only double-precision floating points that are compliant with"
42 " IEC 559 (aka IEEE 754) are supported");
43 }
44
45 // Element properties
showProperties(std::string & strResult) const46 void CLogarithmicParameterAdaptation::showProperties(std::string &strResult) const
47 {
48 base::showProperties(strResult);
49
50 strResult += " - LogarithmBase: ";
51 strResult += std::to_string(_dLogarithmBase);
52 strResult += "\n";
53 strResult += " - FloorValue: ";
54 strResult += std::to_string(_dFloorValue);
55 strResult += "\n";
56 }
57
fromXml(const CXmlElement & xmlElement,CXmlSerializingContext & serializingContext)58 bool CLogarithmicParameterAdaptation::fromXml(const CXmlElement &xmlElement,
59 CXmlSerializingContext &serializingContext)
60 {
61 if (xmlElement.getAttribute("LogarithmBase", _dLogarithmBase) &&
62 (_dLogarithmBase <= 0 || _dLogarithmBase == 1)) {
63 // Avoid negative and 1 values
64 serializingContext.setError("LogarithmBase attribute cannot be negative or 1 on element" +
65 xmlElement.getPath());
66
67 return false;
68 }
69
70 xmlElement.getAttribute("FloorValue", _dFloorValue);
71
72 // Base
73 return base::fromXml(xmlElement, serializingContext);
74 }
75
fromUserValue(double value) const76 int64_t CLogarithmicParameterAdaptation::fromUserValue(double value) const
77 {
78 return std::max(base::fromUserValue(log(value) / log(_dLogarithmBase)),
79 static_cast<int64_t>(_dFloorValue));
80 }
81
toUserValue(int64_t iValue) const82 double CLogarithmicParameterAdaptation::toUserValue(int64_t iValue) const
83 {
84 return exp(base::toUserValue(iValue) * log(_dLogarithmBase));
85 }
86