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command line util to encode/decode framed packets? (lemmy.world)

submitted 3 months ago by nycki@lemmy.world to c/technology@lemmy.world

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I'm currently trying to set up a homebrew cassette tape storage format, but trying to use existing tech where possible. I was excited to see that minimodem already exists for converting an audio stream to a byte stream, and is even available in termux for android, so I could decode cassettes with my phone! However, I'd like some sort of higher-level tool to encode and decode "packets" or "slices" so that I can add error correction. I'm sure this sort of thing must exist for amature radio purposes.

I could write a script that cuts a file into slices, with checksums and redundancy for each slice, and then pads them with null bytes so I can isolate each frame when decoding. What I want is to find out if that's already been done. I've heard of AX.25 packets but I can't find a tool that does that with stdio.

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[–] nycki@lemmy.world 1 points 3 months ago (1 children)

I'm using a regular off-the-shelf tape recorder, it doesnt have an electronic interface, I just press play and record manually.

[–] catloaf@lemm.ee 1 points 3 months ago (1 children)

So how are you retrieving files? Writing down timestamps? Tar should be able to find the start of an archive if you give it a little lead-in.

[–] nycki@lemmy.world 1 points 3 months ago

That's exactly what I thought would work, but it doesn't.