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lagrange interpolation optimization #1533

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lagrange interpolation optimization #1533

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10 changes: 5 additions & 5 deletions modules/juce_dsp/processors/juce_DelayLine.h
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Original file line number Diff line number Diff line change
Expand Up @@ -253,16 +253,16 @@ class DelayLine
auto value3 = samples[index3];
auto value4 = samples[index4];

auto d0 = delayFrac;
auto d1 = delayFrac - 1.f;
auto d2 = delayFrac - 2.f;
auto d3 = delayFrac - 3.f;

auto c1 = -d1 * d2 * d3 / 6.f;
auto c2 = d2 * d3 * 0.5f;
auto c3 = -d1 * d3 * 0.5f;
auto c4 = d1 * d2 / 6.f;
auto a = d1 * d2 / 6.f;
auto b = d3 * d0 * 0.5f;

return value1 * c1 + delayFrac * (value2 * c2 + value3 * c3 + value4 * c4);
return a * (d0 * value4 - d3 * value1)
+ b * (d2 * value2 - d1 * value3);
}
else if constexpr (std::is_same_v<InterpolationType, DelayLineInterpolationTypes::Thiran>)
{
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