ardour { ["type"] = "dsp", name = "Lua Convolver", license = "MIT", author = "Ardour Team", description = [[Another simple DSP example]] } function dsp_ioconfig () return { { audio_in = 1, audio_out = 1}, { audio_in = 1, audio_out = 2}, { audio_in = 2, audio_out = 2}, } end local conv, mode, ir_file ir_file = "/tmp/reverbs/St Nicolaes Church.wav" ir_file = "/tmp/reverbs/Large Wide Echo Hall.wav" function dsp_configure (ins, outs) if outs:n_audio() == 1 then assert (ins:n_audio() == 1) mode = ARDOUR.DSP.IRChannelConfig.Mono elseif ins:n_audio() == 1 then assert (outs:n_audio() == 2) mode = ARDOUR.DSP.IRChannelConfig.MonoToStereo else assert (ins:n_audio() == 2) assert (outs:n_audio() == 2) mode = ARDOUR.DSP.IRChannelConfig.Stereo end local irs = ARDOUR.DSP.IRSettings() irs.gain = 0.5 conv = ARDOUR.DSP.Convolver (Session, ir_file, mode, irs) collectgarbage () end function dsp_latency () if conv then return conv:latency() else return 0 end end -- the DSP callback function to process audio audio -- "ins" and "outs" are http://manual.ardour.org/lua-scripting/class_reference/#C:FloatArray function dsp_run (ins, outs, n_samples) assert (#ins <= #outs) for c = 1, #ins do if ins[c] ~= outs[c] then -- if processing is not in-place.. ARDOUR.DSP.copy_vector (outs[c], ins[c], n_samples) -- ..copy data from input to output. end end if #outs == 1 then conv:run_mono (outs[1], n_samples) else conv:run_stereo (outs[1], outs[2], n_samples) end end