1 files changed, 43 insertions, 0 deletions
diff --git a/scripts/amp2.lua b/scripts/amp2.lua
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+++ b/scripts/amp2.lua
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+ardour {
+	["type"]    = "dsp",
+	name        = "Simple Amp II",
+	license     = "MIT",
+	author      = "Robin Gareus",
+	email       = "robin@gareus.org",
+	site        = "http://gareus.org",
+	description = [[
+	An Example DSP Plugin for processing audio, to
+	be used with Ardour's Lua scripting facility.]]
+}
+
+-- see amp1.lua
+function dsp_ioconfig ()
+	return { [1] = { audio_in = -1, audio_out = -1}, }
+end
+
+function dsp_configure (ins, outs)
+	audio_ins = ins:n_audio();
+	local audio_outs = outs:n_audio()
+	assert (audio_ins == audio_outs)
+end
+
+
+-- this variant modifies the audio data in-place
+-- in Ardour's buffer.
+--
+-- It relies on the fact that by default Ardour requires
+-- plugins to process data in-place (zero copy).
+--
+-- Every assignment directly calls a c-function behind
+-- the scenes to get/set the value.
+-- It's a bit more efficient than "Amp I" on most systems.
+
+function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
+	for c = 1,audio_ins do
+		local b = in_map:get(ARDOUR.DataType("audio"), c - 1); -- get id of mapped buffer
+		local a = bufs:get_audio(b):data(offset):array() -- get a reference (pointer to array)
+		for s = 1,n_samples do
+			a[s] = a[s] * 2; -- modify data in-place (shared with ardour)
+		end
+	end
+end