3 name = "Simple Amp II",
5 author = "Robin Gareus",
6 email = "robin@gareus.org",
7 site = "http://gareus.org",
9 An Example DSP Plugin for processing audio, to
10 be used with Ardour's Lua scripting facility.]]
14 function dsp_ioconfig ()
15 return { [1] = { audio_in = -1, audio_out = -1}, }
18 function dsp_configure (ins, outs)
19 audio_ins = ins:n_audio();
20 local audio_outs = outs:n_audio()
21 assert (audio_ins == audio_outs)
25 -- this variant modifies the audio data in-place
26 -- in Ardour's buffer.
28 -- It relies on the fact that by default Ardour requires
29 -- plugins to process data in-place (zero copy).
31 -- Every assignment directly calls a c-function behind
32 -- the scenes to get/set the value.
33 -- It's a bit more efficient than "Amp I" on most systems.
35 function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
36 for c = 1,audio_ins do
37 local b = in_map:get(ARDOUR.DataType("audio"), c - 1); -- get id of mapped buffer
38 local a = bufs:get_audio(b):data(offset):array() -- get a reference (pointer to array)
39 for s = 1,n_samples do
40 a[s] = a[s] * 2; -- modify data in-place (shared with ardour)