86 lines
2.8 KiB
Lua
86 lines
2.8 KiB
Lua
ardour { ["type"] = "Snippet", name = "Vamp TempoMap Test" }
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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 the QM BarBeat Tracker
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-- see http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:LuaAPI:Vamp
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-- http://vamp-plugins.org/plugin-doc/qm-vamp-plugins.html#qm-barbeattracker
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local vamp = ARDOUR.LuaAPI.Vamp("libardourvampplugins:qm-barbeattracker", Session:nominal_sample_rate())
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-- prepare table to hold results
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local beats = {}
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local bars = {}
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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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beats[r:name ()] = {}
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bars[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: Beats, estimated beat locations & beat-number
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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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table.insert (beats[r:name ()], {pos = fn, beat = f.label})
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end
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end
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end
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-- get the 2nd output. here: estimated bar locations
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local fl = feats:table()[1]
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if fl then
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for f in fl:iter () do
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if f.hasTimestamp then
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local fn = Vamp.RealTime.realTime2Frame (f.timestamp, 48000)
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table.insert (bars[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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vamp:plugin ():setParameter ("Beats Per Bar", 4); -- TODO ask
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-- run the plugin, analyze the first channel of the audio-region
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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 (for now)
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-- TODO: calculate and set tempo-map
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for n,o in pairs(bars) do
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print ("Bar 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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for n,o in pairs(beats) do
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print ("Beat analysis for region:", n)
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for _,t in ipairs(o) do
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print ("-", t['pos'], t['beat'])
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end
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end
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end end
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