65 lines
2.1 KiB
Lua
65 lines
2.1 KiB
Lua
ardour { ["type"] = "Snippet", name = "Vamp Audio Transcription 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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local sr = Session:nominal_sample_rate ()
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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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local vamp = ARDOUR.LuaAPI.Vamp ("libardourvampplugins:qm-transcription", sr)
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-- prepare progress dialog
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local progress_total = 0;
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local progress_part = 0
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local pdialog = LuaDialog.ProgressWindow ("Audio to MIDI", true)
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function cb (_, pos)
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return pdialog:progress ((pos + progress_part) / progress_total, "Analyzing")
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end
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-- calculate max progress
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for r in sel.regions:regionlist ():iter () do
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progress_total = progress_total + r:to_readable ():readable_length ()
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end
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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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vamp:analyze (r:to_readable (), 0, cb)
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if pdialog:canceled () then
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goto out
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end
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progress_part = progress_part + r:to_readable ():readable_length ()
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pdialog:progress (progress_part / progress_total, "Post Processing")
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print ("-- Post Processing: ", r:name ())
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-- post-processing takes longer than actually parsing the data :(
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local f = vamp:plugin ():getRemainingFeatures ()
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local fl = f:table ()[0]
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print (" Time (sample) | Len | Midi-Note");
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if fl then for f in fl:iter () do
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assert (f.hasTimestamp and f.hasDuration);
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local ft = Vamp.RealTime.realTime2Frame (f.timestamp, sr)
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local fd = Vamp.RealTime.realTime2Frame (f.duration, sr)
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local fn = f.values:at (0) -- midi note number
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print (string.format (" %14d %7d %d", ft, fd, fn))
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end end
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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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::out::
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-- hide modal progress dialog and destroy it
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pdialog:done ();
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end end
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