Add a mute/gate plugin

1 files changed, 59 insertions, 0 deletions

diff --git a/share/scripts/a_mute.lua b/share/scripts/a_mute.lua
new file mode 100644
index 0000000000..e52c7dde36
--- /dev/null
+++ b/share/scripts/a_mute.lua
@@ -0,0 +1,59 @@
+ardour {
+	["type"]    = "dsp",
+	name        = "a-Mute",
+	category    = "Amplifier",
+	license     = "MIT",
+	author      = "Ardour Team",
+	description = [[Auotomatable Mute/Gate]]
+}
+
+function dsp_ioconfig ()
+	-- -1, -1 = any number of channels as long as input and output count matches
+	return { { audio_in = -1, audio_out = -1} }
+end
+
+function dsp_params ()
+	return { { ["type"] = "input", name = "Mute", min = 0, max = 1, default = 0, toggled = true } }
+end
+
+local sr = 48000
+local cur_gain = 0.0
+
+function dsp_init (rate)
+	sr = rate
+end
+
+function dsp_configure (ins, outs)
+	n_out   = outs
+	n_audio = outs:n_audio ()
+	n_midi  = outs:n_midi ()
+	assert (n_midi == 0)
+end
+
+-- the DSP callback function
+function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
+	local ctrl = CtrlPorts:array() -- get control port array
+	local target_gain = ctrl[1] > 0 and 0.0 or 1.0; -- when muted, target_gain = 0.0; otherwise use 1.0
+	-- apply I/O map
+	ARDOUR.DSP.process_map (bufs, n_out, in_map, out_map, n_samples, offset)
+
+	local g = cur_gain
+	for c = 1, n_audio do
+		local ob = out_map:get (ARDOUR.DataType ("audio"), c - 1); -- get id of mapped output buffer for given cannel
+		if (ob ~= ARDOUR.ChanMapping.Invalid) then
+			cur_gain = ARDOUR.Amp.apply_gain (bufs:get_audio(ob), sr, n_samples, g, target_gain, offset)
+		end
+	end
+
+	-- This plugin doesn't allow MIDI I/O, but it could:
+	--[[
+	if (target_gain == 0) then
+		for c = 1, n_midi do
+			local ob = out_map:get (ARDOUR.DataType ("midi"), c - 1);
+			if (ob ~= ARDOUR.ChanMapping.Invalid) then
+				bufs:get_midi(ob):silence (n_samples, offset)
+			end
+		end
+	end
+	--]]
+end