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ardour { ["type"] = "Snippet", name = "Vamp Audio Transcription Example" }
function factory () return function ()
-- get Editor selection
-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:Editor
-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:Selection
local sel = Editor:get_selection ()
local sr = Session:nominal_sample_rate ()
-- Instantiate a Vamp Plugin
-- see http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:LuaAPI:Vamp
local vamp = ARDOUR.LuaAPI.Vamp ("libardourvampplugins:qm-transcription", sr)
-- prepare progress dialog
local progress_total = 0;
local progress_part = 0
local pdialog = LuaDialog.ProgressWindow ("Audio to MIDI", true)
function cb (_, pos)
return pdialog:progress ((pos + progress_part) / progress_total, "Analyzing")
end
-- calculate max progress
for r in sel.regions:regionlist ():iter () do
progress_total = progress_total + r:to_readable ():readable_length ()
end
-- for each selected region
-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:RegionSelection
for r in sel.regions:regionlist ():iter () do
-- "r" is-a http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:Region
vamp:analyze (r:to_readable (), 0, cb)
if pdialog:canceled () then
goto out
end
progress_part = progress_part + r:to_readable ():readable_length ()
pdialog:progress (progress_part / progress_total, "Post Processing")
print ("-- Post Processing: ", r:name ())
-- post-processing takes longer than actually parsing the data :(
local f = vamp:plugin ():getRemainingFeatures ()
local fl = f:table ()[0]
print (" Time (sample) | Len | Midi-Note");
if fl then for f in fl:iter () do
assert (f.hasTimestamp and f.hasDuration);
local ft = Vamp.RealTime.realTime2Frame (f.timestamp, sr)
local fd = Vamp.RealTime.realTime2Frame (f.duration, sr)
local fn = f.values:at (0) -- midi note number
print (string.format (" %14d %7d %d", ft, fd, fn))
end end
-- reset the plugin (prepare for next iteration)
vamp:reset ()
end
::out::
-- hide modal progress dialog and destroy it
pdialog:done ();
end end
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