1 files changed, 63 insertions, 0 deletions
diff --git a/lib/ladspa_interface.lua b/lib/ladspa_interface.lua
new file mode 100644
index 0000000..794f431
--- /dev/null
+++ b/lib/ladspa_interface.lua
@@ -0,0 +1,63 @@
+--
+-- melisma - extensible and scriptable audio engine
+-- Copyright (C) 2026  Ludvig Gunne Lindström
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program.  If not, see <https://www.gnu.org/licenses/>.
+--
+
+local m_ladspa = require 'melisma.ladspa'
+
+local M = {}
+
+function M.init(spec,...)
+	local interface = {}
+	local info = m_ladspa.info(spec)
+	local instance = m_ladspa.load(spec,...)
+	local audio_index = 1
+	local control_index = 1
+
+	for _,port in ipairs(info.ports) do
+		if port.type == 'control' and port.direction == 'input' then
+			local control_index_copy = control_index
+
+			interface[port.name] = function(self,value)
+				if port.hints.upper_bound and value > port.hints.upper_bound then
+					value = port.hints.upper_bound
+				end
+
+				if port.hints.lower_bound and value < port.hints.lower_bound then
+					value = port.hints.lower_bound
+				end
+
+				instance:control(control_index_copy,value)
+				return self
+			end
+
+			if port.hints.default then
+				interface[port.name](nil,port.hints.default)
+			end
+
+			control_index = control_index + 1
+		end
+
+		if port.type == 'audio' and port.direction == 'output' then
+			interface[port.name] = instance(audio_index)
+			audio_index = audio_index + 1
+		end
+	end
+
+	return interface
+end
+
+return M