Audio Spectrum Analyzer in C#

Hello! I'm looking for someone to prepare a C# Visual Studio Solution with a function that allows me to enter audio frames (eighter float array or double array, mono only - stereo not needed) and a samplerate. The return of the function has to be a 2-Dimensional Array with X-Axis being time and Y-Axis being frequency, and the output values being the strength of the frequency at a given time. Additional Parameters for the function like accuracy/speed are fine aswell, but please let me know what they do. The Output is supposed to be a Spectrogram, on google images you can see what it looks like. It will probably be a FFT and some kind of comb function. I dont need visualization, 2-D Array is enough and ill take it from there, but outputing some png file would be good to show that it works, but dont worry too much about that. And you can load some song samples with NAudio to test it. Feel free to use existing Libraries and Adapt them. Dont wory about commercial licensing, this is a non-comerical project. You can also do this Task in C++ and then write a Wrapper for C#. Or write directly to C#. As long as the main convert function is accessable in C# its fine! but please dont use Python or so because of performance reasons. Im a coder myself but to busy with other projects, so don't shy away from reaching out or asking about technical details. Thanks a lot!