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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
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