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Diffstat (limited to 'scripts/amp1.lua')
| -rw-r--r-- | scripts/amp1.lua | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/scripts/amp1.lua b/scripts/amp1.lua new file mode 100644 index 0000000000..da3dd87eca --- /dev/null +++ b/scripts/amp1.lua @@ -0,0 +1,48 @@ +ardour { + ["type"] = "dsp", + name = "Simple Amp", + 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.]] +} + + +-- return possible i/o configurations +function dsp_ioconfig () + -- -1, -1 = any number of channels as long as input and output count matches + return { [1] = { audio_in = -1, audio_out = -1}, } +end + +-- optional function, called when configuring the plugin +function dsp_configure (ins, outs) + -- store configuration in global variable + audio_ins = ins:n_audio(); + local audio_outs = outs:n_audio() + assert (audio_ins == audio_outs) +end + +-- this variant asks for a complete *copy* of the +-- audio data in a lua-table. +-- after processing the data is copied back. +-- +-- this also exemplifies the direct "connect and run" process function, +-- where the channel-mapping needs to be done in lua. + +function dsp_runmap (bufs, in_map, out_map, n_samples, offset) + for c = 1,audio_ins do + -- Note: lua starts counting at 1, ardour's ChanMapping::get() at 0 + local ib = in_map:get(ARDOUR.DataType("audio"), c - 1); -- get id of mapped input buffer for given cannel + local ob = out_map:get(ARDOUR.DataType("audio"), c - 1); -- get id of mapped output buffer for given cannel + assert (ib ~= ARDOUR.ChanMapping.Invalid); + assert (ob ~= ARDOUR.ChanMapping.Invalid); + local a = bufs:get_audio (ib):data (offset):get_table(n_samples) -- copy audio-data from input buffer + for s = 1,n_samples do + a[s] = a[s] * 2; -- amplify data in lua table + end + bufs:get_audio(ob):data(offset):set_table(a, n_samples) -- copy back + end +end |