64 lines
2.2 KiB
Lua
64 lines
2.2 KiB
Lua
ardour { ["type"] = "Snippet", name = "Vamp Plugin Example" }
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function factory () return function ()
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-- get a list of all available plugins
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-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:LuaAPI:Vamp
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-- returns a http://manual.ardour.org/lua-scripting/class_reference/#C:StringVector
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local plugins = ARDOUR.LuaAPI.Vamp.list_plugins ();
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for id in plugins:iter () do
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print ("--", id)
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end
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local sel = Editor:get_selection ()
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-- load the Vamp Plugin with Id "libardourvampplugins:dBTP"
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-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:LuaAPI:Vamp
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local vamp = ARDOUR.LuaAPI.Vamp("libardourvampplugins:dBTP", Session:nominal_sample_rate())
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print (vamp:plugin():getName())
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-- for each selected region
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for r in sel.regions:regionlist ():iter () do
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print ("Region:", r:name ())
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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, nil)
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-- get analysis results
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local f = vamp:plugin ():getRemainingFeatures ()
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-- f is-a Vamp::Plugin::FeatureSet aka std::map<int, Vamp::Plugin::FeatureList>
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-- http://manual.ardour.org/lua-scripting/class_reference/#Vamp:Plugin:FeatureSet
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for id, featlist in f:iter () do
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print (id, featlist)
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end
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-- get the first FeatureList
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local featurelist = f:table()[0]
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-- Vamp::Plugin::FeatureList is a typedef for std::vector<Feature>
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for feat in featurelist:iter () do
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print ("-", feat.label)
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end
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-- get the first feature..
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-- http://manual.ardour.org/lua-scripting/class_reference/#Vamp:Plugin:Feature
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local feature = featurelist:at(0)
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-- ..and the values of the feature, which is-a std::vector<float>
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local values = feature.values
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-- iterate over the std::vector<float>
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for val in values:iter () do
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print ("*", val)
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end
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-- access the first element of Vamp::Plugin::Feature's "values" vector
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-- http://manual.ardour.org/lua-scripting/class_reference/#C:FloatVector
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local value = values:at(0)
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-- in case of libardourvampplugins:dBTP that's the true-peak (signal value)
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local dbtp = 20 * math.log (value) / math.log(10) -- convert it to dB
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print (string.format ("Region '%s': %.2f dBTP", r:name (), dbtp))
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-- reset the plugin for the next iteration
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vamp:reset ()
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end
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end end
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