84 lines
3.1 KiB
Lua
84 lines
3.1 KiB
Lua
ardour { ["type"] = "Snippet", name = "Vamp Onset Detection Example" }
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function factory () return function ()
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-- get Editor selection
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-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:Editor
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-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:Selection
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local sel = Editor:get_selection ()
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-- Instantiate a Vamp Plugin
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-- see http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:LuaAPI:Vamp
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--
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-- here: the "Queen Mary Note Onset Detector" Vamp plugin (which comes with Ardour)
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-- http://vamp-plugins.org/plugin-doc/qm-vamp-plugins.html#qm-onsetdetector
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local vamp = ARDOUR.LuaAPI.Vamp("libardourvampplugins:qm-onsetdetector", Session:nominal_sample_rate())
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-- prepare table to hold results
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local onsets = {}
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-- for each selected region
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-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:RegionSelection
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for r in sel.regions:regionlist ():iter () do
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-- "r" is-a http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:Region
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-- prepare lua table to hold results for the given region (by name)
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onsets[r:name ()] = {}
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-- callback to handle Vamp-Plugin analysis results
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function callback (feats)
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-- "feats" is-a http://manual.ardour.org/lua-scripting/class_reference/#Vamp:Plugin:FeatureSet
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-- get the first output. here: Detected note onset times
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local fl = feats:table()[0]
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-- "fl" is-a http://manual.ardour.org/lua-scripting/class_reference/#Vamp:Plugin:FeatureList
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-- which may be empty or not nil
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if fl then
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-- iterate over returned features
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for f in fl:iter () do
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-- "f" is-a http://manual.ardour.org/lua-scripting/class_reference/#Vamp:Plugin:Feature
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if f.hasTimestamp then
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local fn = Vamp.RealTime.realTime2Frame (f.timestamp, 48000)
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--print ("-", f.timestamp:toString(), fn)
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table.insert (onsets[r:name ()], fn)
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end
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end
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end
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return false -- continue, !cancel
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end
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-- Configure Vamp plugin
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--
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-- One could query the Parameter and Program List:
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-- http://manual.ardour.org/lua-scripting/class_reference/#Vamp:Plugin
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-- but since the Plugin is known, we can directly refer to the plugin doc:
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-- http://vamp-plugins.org/plugin-doc/qm-vamp-plugins.html#qm-onsetdetector
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vamp:plugin ():setParameter ("dftype", 3);
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vamp:plugin ():setParameter ("sensitivity", 50);
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vamp:plugin ():setParameter ("whiten", 0);
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-- in this case the above (3, 50, 0) is equivalent to
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--vamp:plugin ():selectProgram ("General purpose");
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-- run the plugin, analyze the first channel of the audio-region
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--
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-- This uses a "high-level" convenience wrapper provided by Ardour
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-- which reads raw audio-data from the region and and calls
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-- f = vamp:plugin ():process (); callback (f)
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vamp:analyze (r:to_readable (), 0, callback)
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-- get remaining features (end of analysis)
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callback (vamp:plugin ():getRemainingFeatures ())
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-- reset the plugin (prepare for next iteration)
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vamp:reset ()
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end
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-- print results
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for n,o in pairs(onsets) do
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print ("Onset analysis for region:", n)
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for _,t in ipairs(o) do
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print ("-", t)
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end
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end
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end end
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