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94 lines
3.9 KiB
94 lines
3.9 KiB
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2015 - ROLI Ltd.
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Permission is granted to use this software under the terms of either:
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a) the GPL v2 (or any later version)
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b) the Affero GPL v3
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Details of these licenses can be found at: www.gnu.org/licenses
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.juce.com for more information.
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==============================================================================
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*/
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#ifndef JUCE_LAGRANGEINTERPOLATOR_H_INCLUDED
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#define JUCE_LAGRANGEINTERPOLATOR_H_INCLUDED
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//==============================================================================
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/**
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Interpolator for resampling a stream of floats using 4-point lagrange interpolation.
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Note that the resampler is stateful, so when there's a break in the continuity
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of the input stream you're feeding it, you should call reset() before feeding
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it any new data. And like with any other stateful filter, if you're resampling
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multiple channels, make sure each one uses its own LagrangeInterpolator
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object.
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*/
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class JUCE_API LagrangeInterpolator
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{
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public:
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LagrangeInterpolator();
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~LagrangeInterpolator();
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/** Resets the state of the interpolator.
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Call this when there's a break in the continuity of the input data stream.
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*/
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void reset() noexcept;
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/** Resamples a stream of samples.
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@param speedRatio the number of input samples to use for each output sample
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@param inputSamples the source data to read from. This must contain at
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least (speedRatio * numOutputSamplesToProduce) samples.
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@param outputSamples the buffer to write the results into
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@param numOutputSamplesToProduce the number of output samples that should be created
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@returns the actual number of input samples that were used
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*/
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int process (double speedRatio,
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const float* inputSamples,
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float* outputSamples,
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int numOutputSamplesToProduce) noexcept;
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/** Resamples a stream of samples, adding the results to the output data
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with a gain.
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@param speedRatio the number of input samples to use for each output sample
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@param inputSamples the source data to read from. This must contain at
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least (speedRatio * numOutputSamplesToProduce) samples.
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@param outputSamples the buffer to write the results to - the result values will be added
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to any pre-existing data in this buffer after being multiplied by
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the gain factor
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@param numOutputSamplesToProduce the number of output samples that should be created
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@param gain a gain factor to multiply the resulting samples by before
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adding them to the destination buffer
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@returns the actual number of input samples that were used
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*/
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int processAdding (double speedRatio,
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const float* inputSamples,
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float* outputSamples,
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int numOutputSamplesToProduce,
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float gain) noexcept;
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private:
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float lastInputSamples[5];
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double subSamplePos;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (LagrangeInterpolator)
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};
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#endif // JUCE_LAGRANGEINTERPOLATOR_H_INCLUDED
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