Import Paramat's 'env_sounds' from Minetest Game into MCL2.

mods/ENVIRONMENT/env_sounds/README.txt

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+Minetest Game mod: env_sounds
+=============================
+See license.txt for license information.
+
+Authors of source code
+----------------------
+paramat (MIT)
+
+Authors of media (sounds)
+-------------------------
+Yuval (CC0 1.0)
+https://freesound.org/people/Yuval/sounds/197023/
+  env_sounds_water.*.ogg
+
+Halion (CC0 1.0)
+https://freesound.org/people/Halion/sounds/17785/
+  env_sounds_lava.*.ogg

mods/ENVIRONMENT/env_sounds/init.lua

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+-- Parameters
+
+-- Node search radius around player
+local radius = 7
+
+local allsounds = {
+	["env_sounds_water"] = {
+		trigger = {"mcl_core:water_flowing", "mclx_core:river_water_flowing"},
+		base_volume = 0.04,
+		max_volume = 0.4,
+		per_node = 0.004,
+	},
+	["env_sounds_lava"] = {
+		trigger = {"mcl_core:lava_source", "mcl_core:lava_flowing","mcl_nether:nether_lava_source", "mcl_nether:nether_lava_flowing"},
+		base_volume = 0.9,
+		max_volume = 2,
+		per_node = {
+			["mcl_core:lava_source"] = 0.08,
+			["mcl_core:lava_flowing"] = 0.08,
+			["mcl_nether:nether_lava_source"] = 0.08,
+			["mcl_nether:nether_lava_flowing"] = 0.08,
+		},
+	},
+}
+
+if minetest.settings:get_bool("river_source_sounds") then
+	table.insert(allsounds["env_sounds_water"].trigger,
+		"mclx_core:river_water_source")
+end
+
+
+-- Cache the union of all trigger nodes
+
+local cache_triggers = {}
+
+for sound, def in pairs(allsounds) do
+	for _, name in ipairs(def.trigger) do
+		table.insert(cache_triggers, name)
+	end
+end
+
+
+-- Update sound for player
+
+local function update_sound(player)
+	local player_name = player:get_player_name()
+	local ppos = player:get_pos()
+	ppos = vector.add(ppos, player:get_properties().eye_height)
+	local areamin = vector.subtract(ppos, radius)
+	local areamax = vector.add(ppos, radius)
+
+	local pos = minetest.find_nodes_in_area(areamin, areamax, cache_triggers, true)
+	if next(pos) == nil then -- If table empty
+		return
+	end
+	for sound, def in pairs(allsounds) do
+		-- Find average position
+		local posav = {0, 0, 0}
+		local count = 0
+		for _, name in ipairs(def.trigger) do
+			if pos[name] then
+				for _, p in ipairs(pos[name]) do
+					posav[1] = posav[1] + p.x
+					posav[2] = posav[2] + p.y
+					posav[3] = posav[3] + p.z
+				end
+				count = count + #pos[name]
+			end
+		end
+
+		if count > 0 then
+			posav = vector.new(posav[1] / count, posav[2] / count,
+				posav[3] / count)
+
+			-- Calculate gain
+			local gain = def.base_volume
+			if type(def.per_node) == 'table' then
+				for name, multiplier in pairs(def.per_node) do
+					if pos[name] then
+						gain = gain + #pos[name] * multiplier
+					end
+				end
+			else
+				gain = gain + count * def.per_node
+			end
+			gain = math.min(gain, def.max_volume)
+
+			minetest.sound_play(sound, {
+				pos = posav,
+				to_player = player_name,
+				gain = gain,
+			}, true)
+		end
+	end
+end
+
+
+-- Update sound when player joins
+
+minetest.register_on_joinplayer(function(player)
+	update_sound(player)
+end)
+
+
+-- Cyclic sound update
+
+local function cyclic_update()
+	for _, player in pairs(minetest.get_connected_players()) do
+		update_sound(player)
+	end
+	minetest.after(2.5, cyclic_update)
+end
+
+minetest.after(0, cyclic_update)

mods/ENVIRONMENT/env_sounds/license.txt

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+License of source code
+----------------------
+
+The MIT License (MIT)
+Copyright (C) 2019 paramat
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this
+software and associated documentation files (the "Software"), to deal in the Software
+without restriction, including without limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of the Software, and to permit
+persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+For more details:
+https://opensource.org/licenses/MIT
+
+
+Licenses of media (sounds)
+--------------------------
+Water sounds:
+
+CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
+Yuval
+
+No Copyright
+
+The person who associated a work with this deed has dedicated the work to the
+public domain by waiving all of his or her rights to the work worldwide under
+copyright law, including all related and neighboring rights, to the extent
+allowed by law.
+
+You can copy, modify, distribute and perform the work, even for commercial
+purposes, all without asking permission. See Other Information below.
+
+Other Information:
+
+In no way are the patent or trademark rights of any person affected by CC0, nor
+are the rights that other persons may have in the work or in how the work is
+used, such as publicity or privacy rights.
+
+Unless expressly stated otherwise, the person who associated a work with this
+deed makes no warranties about the work, and disclaims liability for all uses
+of the work, to the fullest extent permitted by applicable law.
+
+When using or citing the work, you should not imply endorsement by the author
+or the affirmer.
+
+For more details:
+https://creativecommons.org/publicdomain/zero/1.0/
+--------------------------
+
+Title: env_sounds_lava.X.ogg
+Author: Audionautics
+Source: https://freesound.org/people/Audionautics/sounds/133901/
+License: CC-By

mods/ENVIRONMENT/env_sounds/mod.conf

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+name = env_sounds
+description = Minetest Game mod converted for use with MCL2: env_sounds
+depends = mcl_core