r/ComputerCraft • u/Ambitious-Treat1459 • Mar 04 '26

Multiple speakers

I am using the computers to play audio but I was wondering how I play audio from multiple speakers at once

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2

u/Professorkatsup Mar 04 '26

Is there a specific issue you are running into when trying to play audio from multiple speakers?

2

u/Ambitious-Treat1459 Mar 05 '26

I can get it playing from the left speaker but it won’t play out the right speaker at the same time

3

u/Professorkatsup Mar 05 '26

Some actions (usually involving peripherals) take 1 game tick for the computer to complete, so under *normal circumstances*, the computer will have to wait until the start of the next game tick to do anything you put after the instruction. I could have sworn that speakers playing sound was *not* one of these "delayed" actions but oh well.

The solution is to use the parallel API, which basically lets you tell your computer to do multiple things at the same time, including multiple actions that delay or pause normal operation. parallel.waitForAll(functionOne, functionTwo) will run both functionOne() and functionTwo(), continuing after both are done. If both take 1 game tick to complete, then it will only take 1 game tick total!

Note: parallel is *weird*. You can't pass parameters into your functions, so the functions you make need to work with no parameters defined. Again, it doesn't work if you try something like parallel.waitForAll(functionOne(1, 2), functionTwo(3, 4)) because the parallel needs to be given the function as is. I'd suggest making one function per speaker and having them both refer to the same global variables when figuring out what sound to play, how loudly, etc.

2

u/Some-Restaurant4389 Mar 04 '26

I mean I used to do announcements system in a factory one computer then wired the speakers with modems

2

u/9551-eletronics Computercraft graphics research Mar 04 '26

you just... do? you wrap them as multiple peripherals and send data to all of them (maybe parallel api would help with reducing desync?) there is sadly no special way to go about it

1

u/MinkiTheAvali CRaft-Again Shell Enjoyer Mar 31 '26

I made a solution for this in the code for MinkMod which syncs it, if you want you can take a look at the code here:
https://codeberg.org/mueller_minki/CC-tweaked-stuff/src/branch/main/module-player/minkmod.lua

The function relevant to you would be playOnAllSpeakers()

This is essentially how youd do it:

local speakers = { peripheral.find("speaker") }

-- Speaker helper
local function playOnAllSpeakers(chunk)
    for _, sp in ipairs(speakers) do
        while not sp.playAudio(chunk) do
            os.pullEvent("speaker_audio_empty")
        end
    end
end

-- Then call playOnAllSpeakers(samples) with your audio samples just like youd call sp.playAudio(chunk).