[feature request] 8-channel audio output

[struthiocamelus]

Hi, I'm the author of https://github.com/struthiocamelus/lsdj-ripper

This project makes a custom AudioPlayer in order to run the emulator much faster than realtime so I can render songs written in LSDJ to WAV output.

Is it possible for Sound to be refactored to allow for each of the APU's R/L channels to be emitted independently? This would allow folks authoring on LSDJ to be able to output independent tracks for post-render mastering in a separate DAW.

This type of multi-channel sound output is supported by BGB.

My thinking here:

• Add a typed Mixer<T> trait where T is the data the Mixer sends to the AudioPlayer<T>
• Type Sound<T> so that all fit together
• The default implementation is thus Sound<(f32, f32)>
• A custom implementation I'm planning on might be Sound<[f32; 8]> or even better Sound<APUChannelBuffers> that contains the raw channels.

Is there an easier alternative?

[mvdnes]

Hello,

Thank you for the request!
I think this would be a nice addition.

Your implementation idea seems like a good idea. Than you can specify a custom mix_buffers function and have custom AudioPlayer::play with a signature that matches the output of mix_buffers.

I can implement this, but it might take some time since I have mostly priorities right now. If you are willing to code something yourself I would be happy to take a look at it.

[struthiocamelus]

I'm also trying to tackle some fundamental sound accuracy issues before moving on to this 😅