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JUCE
JUCE is an open-source cross-platform C++ application framework for desktop and mobile applications, including VST, VST3, AU, AUv3, LV2 and AAX audio plug-ins.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Also , did you know that the CCCP was a Linux package manager ?
Since these classes do what you want, a good starting point is looking at their algorithms. https://github.com/juce-framework/JUCE/tree/master/modules/juce_audio_basics/utilities You'll find various resampling interpolators here. Have a look at the Lagrange and Catmull-Rom interpolators.
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