Ambience/ambience/init.lua

local night = {
	handler = {},
	{name="horned_owl", length=3},
	{name="Wolves_Howling", length=11}
}

local night_frequent = {
	handler = {},
	{name="Crickets_At_NightCombo", length=69}
}

local day = {
	handler = {},
	{name="bird", length=30}
}

local day_frequent = {
	handler = {},
	{name="", length=0}
}

local cave = {
	handler = {},
	{name="Bats_in_Cave", length=5}
}

local cave_frequent = {
	handler = {},
	{name="drippingwater_dripa", length=2},
	{name="drippingwater_dripb", length=2},
	{name="drippingwater_dripc", length=2},
	{name="Single_Water_Droplet", length=3},
	{name="Spooky_Water_Drops", length=7}
}

-- start playing the sound, set the handler and delete the handler after sound is played
local play_sound = function(player, list, number)
	local player_name = player:get_player_name()
	if list.handler[player_name] == nil then
		local handler = minetest.sound_play(list[number].name, {to_player=player_name})
		if handler ~= nil then
			list.handler[player_name] = handler
			minetest.after(list[number].length, function(args)
				local list = args[1]
				local player_name = args[2]
				if list.handler[player_name] ~= nil then
					minetest.sound_stop(list.handler[player_name])
					list.handler[player_name] = nil
				end
			end, {list, player_name})
		end
	end
end

-- stops all sounds that are not in still_playing
local stop_sound = function(still_playing, player)
	local player_name = player:get_player_name()
	if still_playing.cave == nil then
		local list = cave
		if list.handler[player_name] ~= nil then
			minetest.sound_stop(list.handler[player_name])
			list.handler[player_name] = nil
		end
	end
	if still_playing.cave_frequent == nil then
		local list = cave_frequent
		if list.handler[player_name] ~= nil then
			minetest.sound_stop(list.handler[player_name])
			list.handler[player_name] = nil
		end
	end
	if still_playing.night == nil then
		local list = night
		if list.handler[player_name] ~= nil then
			minetest.sound_stop(list.handler[player_name])
			list.handler[player_name] = nil
		end
	end
	if still_playing.night_frequent == nil then
		local list = night_frequent
		if list.handler[player_name] ~= nil then
			minetest.sound_stop(list.handler[player_name])
			list.handler[player_name] = nil
		end
	end
	if still_playing.day == nil then
		local list = day
		if list.handler[player_name] ~= nil then
			minetest.sound_stop(list.handler[player_name])
			list.handler[player_name] = nil
		end
	end
	if still_playing.day_frequent == nil then
		local list = day_frequent
		if list.handler[player_name] ~= nil then
			minetest.sound_stop(list.handler[player_name])
			list.handler[player_name] = nil
		end
	end
end

local timer = 0
minetest.register_globalstep(function(dtime)
	timer = timer+dtime
	if timer < 5 then
		return
	end
	timer = 0
	-- normal sounds
	if math.random(1, 100) <= 5 then
		if  minetest.env:get_timeofday() < 0.2 or  minetest.env:get_timeofday() > 0.8 then
			for _,player in ipairs(minetest.get_connected_players()) do
				if player:getpos().y < 0 then
					stop_sound({cave=true, cave_frequent=true}, player)
					play_sound(player, cave, math.random(1, #cave))
				else
					stop_sound({night=true, night_frequent=true}, player)
					play_sound(player, night, math.random(1, #night))
				end
			end
		else
			for _,player in ipairs(minetest.get_connected_players()) do
				if player:getpos().y < 0 then
					stop_sound({cave=true, cave_frequent=true}, player)
					play_sound(player, cave, math.random(1, #cave))
				else
					stop_sound({day=true, day_frequent=true}, player)
					play_sound(player, day, math.random(1, #day))
				end
			end
		end
	end

	-- frequent sounds
	if math.random(1, 100) <= 50 then
		if  minetest.env:get_timeofday() < 0.2 or  minetest.env:get_timeofday() > 0.8 then
			for _,player in ipairs(minetest.get_connected_players()) do
				if player:getpos().y < 0 then
					stop_sound({cave=true, cave_frequent=true}, player)
					play_sound(player, cave_frequent, math.random(1, #cave_frequent))
				else
					stop_sound({night=true, night_frequent=true}, player)
					play_sound(player, night_frequent, math.random(1, #night_frequent))
				end
			end
		else
			for _,player in ipairs(minetest.get_connected_players()) do
				if player:getpos().y < 0 then
					stop_sound({cave=true, cave_frequent=true}, player)
					play_sound(player, cave_frequent, math.random(1, #cave_frequent))
				else
					stop_sound({day=true, day_frequent=true}, player)
					play_sound(player, day_frequent, math.random(1, #day_frequent))
				end
			end
		end
	end
end)