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74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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template <int k>
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struct LagrangeResampleHelper
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{
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static forcedinline void calc (float& a, float b) noexcept { a *= b * (1.0f / k); }
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};
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template <>
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struct LagrangeResampleHelper<0>
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{
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static forcedinline void calc (float&, float) noexcept {}
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};
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template <int k>
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static float calcCoefficient (float input, float offset) noexcept
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{
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LagrangeResampleHelper<0 - k>::calc (input, -2.0f - offset);
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LagrangeResampleHelper<1 - k>::calc (input, -1.0f - offset);
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LagrangeResampleHelper<2 - k>::calc (input, 0.0f - offset);
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LagrangeResampleHelper<3 - k>::calc (input, 1.0f - offset);
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LagrangeResampleHelper<4 - k>::calc (input, 2.0f - offset);
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return input;
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}
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float Interpolators::LagrangeTraits::valueAtOffset (const float* inputs, float offset, int index) noexcept
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{
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float result = 0.0f;
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result += calcCoefficient<0> (inputs[index], offset); if (++index == 5) index = 0;
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result += calcCoefficient<1> (inputs[index], offset); if (++index == 5) index = 0;
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result += calcCoefficient<2> (inputs[index], offset); if (++index == 5) index = 0;
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result += calcCoefficient<3> (inputs[index], offset); if (++index == 5) index = 0;
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result += calcCoefficient<4> (inputs[index], offset);
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return result;
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}
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} // namespace juce
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