prototype polyphonic audio to midi script

diff --git a/scripts/_vamp_audio_to_midi.lua b/scripts/_vamp_audio_to_midi.lua
new file mode 100644 (file)
index 0000000..59a6a96
--- /dev/null
+++ b/scripts/_vamp_audio_to_midi.lua
@@ -0,0 +1,43 @@
+ardour { ["type"] = "EditorAction", name = "Vamp Audio to MIDI" }
+
+function factory () return function ()
+       local sel = Editor:get_selection ()
+       local sr = Session:nominal_frame_rate ()
+       local tm = Session:tempo_map ()
+       local vamp = ARDOUR.LuaAPI.Vamp ("libardourvampplugins:qm-transcription", sr)
+
+       local ar = nil
+       local mr = nil
+       for r in sel.regions:regionlist ():iter () do
+               if r:to_midiregion():isnil() then
+                       ar = r
+               else
+                       mr = r:to_midiregion()
+               end
+       end
+       -- analyze audio from selected audio region to selected midi region
+       assert (ar and mr)
+
+       vamp:analyze (ar:to_readable (), 0, nil)
+       local fl = vamp:plugin ():getRemainingFeatures ():at (0)
+       if fl and fl:size() > 0 then
+               local mm = mr:midi_source(0):model()
+               local midi_command = mm:new_note_diff_command ("Audio2Midi")
+               for f in fl:iter () do
+                       local ft = Vamp.RealTime.realTime2Frame (f.timestamp, sr / 2)
+                       local fd = Vamp.RealTime.realTime2Frame (f.duration, sr / 2)
+                       local fn = f.values:at (0)
+
+                       local bs = tm:exact_beat_at_frame (ft, 0)
+                       local be = tm:exact_beat_at_frame (ft + fd, 0)
+
+                       local pos = Evoral.Beats (bs)
+                       local len = Evoral.Beats (be - bs)
+
+                       local note = ARDOUR.LuaAPI.new_noteptr (1, pos, len, fn, 0x7f)
+                       midi_command:add (note)
+
+               end
+               mm:apply_command (Session, midi_command)
+       end
+end end