scripts/_vamp_note_example.lua

   1 ardour { ["type"] = "Snippet", name = "Vamp Audio Transcription Example" }
   2
   3 function factory () return function ()
   4
   5         -- simple progress information print()ing
   6         --[[
   7         local progress_total;
   8         local progress_last;
   9         function cb (_f, pos)
  10                 local progress = 100 * pos / progress_total;
  11                 if progress - progress_last > 5 then
  12                         progress_last = progress;
  13                         print ("Progress: ", progress)
  14                 end
  15         end
  16         --]]
  17
  18         -- get Editor selection
  19         -- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:Editor
  20         -- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:Selection
  21         local sel = Editor:get_selection ()
  22         local sr = Session:nominal_sample_rate ()
  23
  24         -- Instantiate a Vamp Plugin
  25         -- see http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:LuaAPI:Vamp
  26         local vamp = ARDOUR.LuaAPI.Vamp ("libardourvampplugins:qm-transcription", sr)
  27
  28         -- for each selected region
  29         -- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:RegionSelection
  30         for r in sel.regions:regionlist ():iter () do
  31                 -- "r" is-a http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:Region
  32
  33                 --[[
  34                 progress_total = r:to_readable ():readable_length ()
  35                 progress_last = 0
  36                 --]]
  37                 vamp:analyze (r:to_readable (), 0, nil --[[cb--]])
  38                 print ("-- Post Processing: ", r:name ())
  39
  40                 -- post-processing takes longer than actually parsing the data :(
  41                 local f = vamp:plugin ():getRemainingFeatures ()
  42
  43                 local fl = f:table ()[0]
  44                 print (" Time (sample) |  Len  | Midi-Note");
  45                 if fl then for f in fl:iter () do
  46                         assert (f.hasTimestamp and f.hasDuration);
  47                         local ft = Vamp.RealTime.realTime2Frame (f.timestamp, sr)
  48                         local fd = Vamp.RealTime.realTime2Frame (f.duration, sr)
  49                         local fn = f.values:at (0) -- midi note number
  50                         print (string.format (" %14d %7d %d", ft, fd, fn))
  51                 end end
  52
  53                 -- reset the plugin (prepare for next iteration)
  54                 vamp:reset ()
  55         end
  56
  57 end end