111 lines
4.5 KiB
Lua
111 lines
4.5 KiB
Lua
ardour {
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["type"] = "dsp",
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name = "Midi Passthru",
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category = "Example",
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license = "MIT",
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author = "Ardour Lua Task Force",
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description = [[An Example Audio/MIDI Passthrough Plugin using Buffer Pointers]]
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}
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-- return possible audio i/o configurations
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function dsp_ioconfig ()
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-- -1, -1 = any number of channels as long as input and output count matches
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-- require 1 MIDI in, 1 MIDI out.
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return { { midi_in = 1, midi_out = 1, audio_in = -1, audio_out = -1}, }
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end
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-- "dsp_runmap" uses Ardour's internal processor API, eqivalent to
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-- 'connect_and_run()". There is no overhead (mapping, translating buffers).
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-- The lua implementation is responsible to map all the buffers directly.
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function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
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-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:ChanMapping
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local ib = in_map:get (ARDOUR.DataType ("midi"), 0) -- get index of the 1st mapped midi input buffer
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if ib ~= ARDOUR.ChanMapping.Invalid then
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-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:MidiBuffer
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local mb = bufs:get_midi (ib) -- get the mapped buffer
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local events = mb:table () -- copy event list into a lua table
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-- iterate over all MIDI events
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for _, e in pairs (events) do
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-- e is-a http://manual.ardour.org/lua-scripting/class_reference/#Evoral:MidiEvent
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-- do something with the event e.g.
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print (e:channel (), e:time (), e:size (), e:buffer ():array ()[1], e:buffer ():get_table (e:size ())[1])
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end
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end
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----
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-- The following code is needed with "dsp_runmap" to work for arbitrary pin connections
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-- this passes though all audio/midi data unprocessed.
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ARDOUR.DSP.process_map (bufs, in_map, out_map, n_samples, offset, ARDOUR.DataType ("audio"))
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ARDOUR.DSP.process_map (bufs, in_map, out_map, n_samples, offset, ARDOUR.DataType ("midi"))
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-- equivalent lua code.
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-- NOTE: the lua implementation below is intended for io-config [-1,-1].
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-- It only works for actually mapped channels due to in_map:count() out_map:count()
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-- being identical to the i/o pin count in this case.
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--
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-- Plugins that have multiple possible configurations will need to implement
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-- dsp_configure() and remember the actual channel count.
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--
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-- ARDOUR.DSP.process_map() does iterate over the mapping itself and works generally.
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-- Still the lua code below does lend itself as elaborate example.
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--
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--[[
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local audio_ins = in_map:count (): n_audio () -- number of mapped audio input buffers
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local audio_outs = out_map:count (): n_audio () -- number of mapped audio output buffers
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assert (audio_outs, audio_ins) -- ioconfig [-1, -1]: must match
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-- copy audio data if any
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for c = 1, audio_ins do
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local ib = in_map:get (ARDOUR.DataType ("audio"), c - 1) -- get index of mapped input buffer
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local ob = out_map:get (ARDOUR.DataType ("audio"), c - 1) -- get index of mapped output buffer
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if ib ~= ARDOUR.ChanMapping.Invalid and ob ~= ARDOUR.ChanMapping.Invalid and ib ~= ob then
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-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:DSP
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-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:AudioBuffer
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ARDOUR.DSP.copy_vector (bufs:get_audio (ob):data (offset), bufs:get_audio (ib):data (offset), n_samples)
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end
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end
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-- Clear unconnected output buffers.
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-- In case we're processing in-place some buffers may be identical,
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-- so this must be done *after* copying relvant data from that port.
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for c = 1, audio_outs do
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local ib = in_map:get (ARDOUR.DataType ("audio"), c - 1)
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local ob = out_map:get (ARDOUR.DataType ("audio"), c - 1)
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if ib == ARDOUR.ChanMapping.Invalid and ob ~= ARDOUR.ChanMapping.Invalid then
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bufs:get_audio (ob):silence (n_samples, offset)
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end
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end
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-- copy midi data
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local midi_ins = in_map:count (): n_midi () -- number of midi input buffers
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local midi_outs = out_map:count (): n_midi () -- number of midi input buffers
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-- with midi_in=1, midi_out=1 in dsp_ioconfig
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-- the following will always be true
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assert (midi_ins == 1)
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assert (midi_outs == 1)
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for c = 1, midi_ins do
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local ib = in_map:get (ARDOUR.DataType ("midi"), c - 1)
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local ob = out_map:get (ARDOUR.DataType ("midi"), c - 1)
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if ib ~= ARDOUR.ChanMapping.Invalid and ob ~= ARDOUR.ChanMapping.Invalid and ib ~= ob then
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bufs:get_midi (ob):copy (bufs:get_midi (ib))
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end
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end
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-- silence unused midi outputs
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for c = 1, midi_outs do
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local ib = in_map:get (ARDOUR.DataType ("midi"), c - 1)
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local ob = out_map:get (ARDOUR.DataType ("midi"), c - 1)
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if ib == ARDOUR.ChanMapping.Invalid and ob ~= ARDOUR.ChanMapping.Invalid then
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bufs:get_midi (ob):silence (n_samples, offset)
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end
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end
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--]]
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end
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