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