| /* |
| * Copyright (c) 2011-2015, Intel Corporation |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation and/or |
| * other materials provided with the distribution. |
| * |
| * 3. Neither the name of the copyright holder nor the names of its contributors |
| * may be used to endorse or promote products derived from this software without |
| * specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR |
| * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include "LinearParameterAdaptation.h" |
| |
| /** |
| * This class is used to perform a logarithmic adapation of type: |
| * (slopeNumerator / slopeDenominator) * log(parameter) + offset |
| * Since log(x) == -INFINITY , we can define FloorValue as a |
| * x -> 0 |
| * a lower bound limit for the adaptation |
| */ |
| class CLogarithmicParameterAdaptation : public CLinearParameterAdaptation |
| { |
| public: |
| CLogarithmicParameterAdaptation(); |
| |
| /** |
| * Conversions must satisfy the following: f(f'(a)) = a |
| * Let f=fromUserValue and f'=toUserValue |
| * if y = f(log(x)/log(base)), then |
| * f'(y) * log(base) = log (x) |
| * exp(f'(y)*log(base)) = x |
| */ |
| virtual int64_t fromUserValue(double dValue) const; |
| virtual double toUserValue(int64_t iValue) const; |
| |
| virtual void showProperties(std::string& strResult) const; |
| |
| virtual bool fromXml(const CXmlElement& xmlElement, CXmlSerializingContext& serializingContext); |
| private: |
| /** |
| * _dLogarithmBase characterizes the new logarithm logB(x) with |
| * the following property: logB(x) = log(x) / log(_dLogarithmBase). |
| * log being the base-e logarithm. |
| */ |
| double _dLogarithmBase; |
| /** |
| * _dFloorValue reflects the lower bound for volume attenuation |
| */ |
| double _dFloorValue; |
| }; |