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