Switching Between Soundtracks

Questions
1

Hullo~
So I’m trying to write some code in order to stop other music and then start playing some new musics. I’m wondering if there’s any way to get an entire mixer group to just stop in Defold.

    if music ~= "25" then
		sound.stop() --stop all sounds (music) from a mixer group here
		sound.play("/music#song")
		music = "25"
	end

…You know, because trying to individually stop every single sound by writing every single url (especially if you’re going to have 100+ maybe songs total in your OST) would be tedious and not fun.

Any help would be appreciated~~

2

Save the id/path of audio that’s currently playing in a Lua module and then stop it when you want it to stop.

3 Likes
3

Do you know about loops? If all of your songs are called “song1”, “song2” etc, you can do this:

		self.songs = {} --this creates a table where we will store some addresses
		for i = 1, 25 do --do this 25 times, where "i" changes for the numbers 1 to 25
			self.song[i] = "/music#song"..i --stores each song url in the table 
		end

then, to stop the music, do this:

   		for i = 1, 25 do
			if i == self.music do 
				sound.play(self.songs[i])
			else
				sound.stop(self.songs[i])
			end
		end

It should work!

3 Likes
4

How would I do that?
(sorry, still kind of new to how Defold works, and the way I’m scripting things may not actually be very… normal, per se)

5

When you do sound.play() you can save the id that you are playing at the same time somewhere.

You could save this in a central places like a Lua module. A basic example of a Lua module is like

local M = {}
return M

Then this file can be required in scripts to share data.

local my_module = require("imports.my_module")
...
my_module.current_song = id
...
sound.stop(my_module.current_song)

You can also save tables of currently playing sounds to know what to stop too.

I recommend keeping your sounds all in one place, such as in the main collection, and then having a central place that does the actual sound.play() etc instead of having that everywhere.

How would I do that?

If any of this is not clear yet please be specific on which part you have a question on.

Besides using builtin Defold audio you can use FMOD too which has a bit more existing features related to this.

3 Likes