#adpcm — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #adpcm, aggregated by home.social.
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Resulta que los discman con protección anti-golpes comprimían el audio en ADPCM.
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Resulta que los discman con protección anti-golpes comprimían el audio en ADPCM.
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Oh and the code (now with the VOX ADPCM) is here!
https://github.com/reillypascal/data2audio
#Databending #Rust #Programming #Coding #Telecom #Telecommunications #ADPCM
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There's definitely going to be a blog post about this, with some more backstory on ADPCM and the VOX format
I've been reading windytan's blog (https://www.windytan.com/2012/11/the-sound-of-dialup-pictured.html) lately and really enjoying the deep dives into how specific audio things work, and I think I want to do some of that.
#Databending #Rust #Programming #Coding #Telecom #Telecommunications #ADPCM
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I found the original VOX ADPCM specification (https://multimedia.cx/mirror/dialogic-adpcm.pdf), and when that didn't sound quite like Audacity's implementation, I looked at the FFMPEG source (https://ffmpeg.org/doxygen/7.0/adpcm_8c_source.html#l00553)
For some reason, FFMPEG seems to do it a bit differently than the specification. I'll have to look into that more and see what's going on, but for the time being, it works!
#Databending #Rust #Programming #Coding #Telecom #Telecommunications #ADPCM
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I implemented my own VOX ADPCM decoder!
I had mentioned (https://reillyspitzfaden.com/posts/2025/05/databending-part-4/#adpcm) wanting to use that format to interpret raw data as audio, and the Rust Symphonia crate (https://crates.io/crates/symphonia/0.3.0) didn't have the VOX variant and assumed the incoming data was properly formatted as an ADPCM file, rather than random data, so it was actually easier to do myself.
Here's how it sounds:
#Databending #Rust #Programming #Coding #Telecom #Telecommunications #ADPCM
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@silsinn9821 According to this documentation it's a YMF288/OPN3. I don't think the first five #touhou games ever used custom #ADPCM which is the most notable removal of this cheaper #OPNA imo, so probably should be fine for #PC98Touhou I guess? That is if Wikipedia is correct that the RSS and custom ADPCM are separate (even if both are using ADPCM) :sagume_think:
@Pawlicker