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Audio supports out-of-core processing. We can create a file-backed Audio object using au = Audio[File[...]]. Any filters applied to it will create a new file-backed Audio, and processing will happen without loading all the data into memory at the same time.

Is there a way to create our own audio filters that can act on file-backed Audio objects, either in pure Mathematica or in C/LibraryLink? The typical filter would need access to an interval $[t-\Delta t, t+\Delta t]$ to be able to compute the amplitude at $t$ (similar to ImageFilter).


Note: I sent the same question to Wolfram Support today, however, at this point I have little hope for a documented solution. Audio is still very new, and I expect lots of improvements and additions in the future. I am posting the question here on SE in the hope that there may exist a simple undocumented way that I haven't discovered yet.

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