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BlackHole
BlackHole is a modern macOS audio loopback driver that allows applications to pass audio to other applications with zero additional latency.
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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.
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Windows-driver-samples
This repo contains driver samples prepared for use with Microsoft Visual Studio and the Windows Driver Kit (WDK). It contains both Universal Windows Driver and desktop-only driver samples.
I've been following the steps here at this guide: https://wiki.archlinux.org/title/PulseAudio/Examples#Mixing_additional_audio_into_the_microphone's_audio and this Github repo: https://github.com/toadjaune/pulseaudio-config.
There is Blackhole whose author has open sourced it: https://github.com/ExistentialAudio/BlackHole. But it's only for macOS.
Maybe corresponding Windows API? https://github.com/microsoft/Windows-driver-samples/tree/master/audio/simpleaudiosample and https://docs.microsoft.com/en-us/windows-hardware/drivers/audio/getting-started-with-wdm-audio-drivers.