amp-mate-rs VS cpal

Rotel still allows this, at least on models a few years old. I have a RA-1572 amplifier, and it's a joy to work with. Plug a serial or a network cable, and start talking to it. It supports the same commands over RS232 or TCP (basic TCP, not HTTP or what have you – just don't open too many connections too often, or it will choke). They also support IR IN / OUT, but I've never attempted to work with those. I seem to remember that the IR codes were documented somewhere, but I can't remember where I've seen that (I've never needed them).

The protocol is documented here: https://www.rotel.com/manuals-resources/rs232-protocols. The TCP commands are the same as the RS232 commands, the docs say on which port it listens, etc.

I've started building a "remote control" to an amp to be used from an I3 bar: https://github.com/vladvasiliu/amp-mate-rs (older Python version which doesn't do much: https://github.com/vladvasiliu/amp_mate).

debugging this nightmare bc its blocking my hobby project. by far the most fucked up issue ive encountered since i started rust.

There is a cross-platform audio library for Rust: cpal https://github.com/rustaudio/cpal

cpal crate should work fine for this use case, though it might be unnecessarily low-level for your use case.

I had to do something similar to this a while back. I used cpal.

Working on a live performance software that would let our band have live real-time practices over the internet. Top priority is minimum latency, so I'm trying to hook it up through ASIO. Not much luck yet. I've tried cpal, but I've run into numerous known random bugs (and some versions don't compile for me). At least I confirmed that I can push the audio through a TCP socket successfully.

With https://github.com/RustAudio/cpal you can access the microphone in a cross platform way, but you’ll get values of range [-1,1] out only. To calculate absolute decibels you would need to calibrate for your specific microphone with a known source.

source of example

you need to use a "loopback" device, as shown here - https://github.com/RustAudio/cpal/pull/478 (note, ive only tested this on windows - if its not supported on linux you could always plug your sound card output into its line-in/mic jack)