3 name = "Simple Amp II",
4 category = "Amplifier",
6 author = "Robin Gareus",
7 email = "robin@gareus.org",
8 site = "http://gareus.org",
10 An Example DSP Plugin for processing audio, to
11 be used with Ardour's Lua scripting facility.]]
15 function dsp_ioconfig ()
16 return { [1] = { audio_in = -1, audio_out = -1}, }
19 function dsp_configure (ins, outs)
20 audio_ins = ins:n_audio();
21 local audio_outs = outs:n_audio()
22 assert (audio_ins == audio_outs)
26 -- this variant modifies the audio data in-place
27 -- in Ardour's buffer.
29 -- It relies on the fact that by default Ardour requires
30 -- plugins to process data in-place (zero copy).
32 -- Every assignment directly calls a c-function behind
33 -- the scenes to get/set the value.
34 -- It's a bit more efficient than "Amp I" on most systems.
36 function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
37 for c = 1,audio_ins do
38 -- ensure that processing does happen in-place
39 local ib = in_map:get(ARDOUR.DataType("audio"), c - 1); -- get id of mapped input buffer for given cannel
40 local ob = out_map:get(ARDOUR.DataType("audio"), c - 1); -- get id of mapped output buffer for given cannel
41 assert (ib ~= ARDOUR.ChanMapping.Invalid);
42 assert (ob ~= ARDOUR.ChanMapping.Invalid);
44 local bi = bufs:get_audio(ib)
45 local bo = bufs:get_audio(ob)
46 assert (bi:sameinstance(bo))
48 local a = bufs:get_audio(ib):data(offset):array() -- get a reference (pointer to array)
49 for s = 1,n_samples do
50 a[s] = a[s] * 2; -- modify data in-place (shared with ardour)