52 lines
1.5 KiB
Lua
52 lines
1.5 KiB
Lua
ardour {
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["type"] = "dsp",
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name = "Simple Amp II",
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category = "Example",
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license = "MIT",
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author = "Ardour Team",
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description = [[
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An Example DSP Plugin for processing audio, to
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be used with Ardour's Lua scripting facility.]]
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}
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-- see amp1.lua
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function dsp_ioconfig ()
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return { [1] = { audio_in = -1, audio_out = -1}, }
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end
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function dsp_configure (ins, outs)
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audio_ins = ins:n_audio();
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local audio_outs = outs:n_audio()
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assert (audio_ins == audio_outs)
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end
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-- this variant modifies the audio data in-place
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-- in Ardour's buffer.
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--
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-- It relies on the fact that by default Ardour requires
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-- plugins to process data in-place (zero copy).
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--
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-- Every assignment directly calls a c-function behind
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-- the scenes to get/set the value.
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-- It's a bit more efficient than "Amp I" on most systems.
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function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
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for c = 1,audio_ins do
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-- ensure that processing does happen in-place
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local ib = in_map:get(ARDOUR.DataType("audio"), c - 1); -- get id of mapped input buffer for given cannel
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local ob = out_map:get(ARDOUR.DataType("audio"), c - 1); -- get id of mapped output buffer for given cannel
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assert (ib ~= ARDOUR.ChanMapping.Invalid);
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assert (ob ~= ARDOUR.ChanMapping.Invalid);
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local bi = bufs:get_audio(ib)
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local bo = bufs:get_audio(ob)
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assert (bi == bo)
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local a = bufs:get_audio(ib):data(offset):array() -- get a reference (pointer to array)
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for s = 1,n_samples do
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a[s] = a[s] * 2; -- modify data in-place (shared with ardour)
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end
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end
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end
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