80 lines
2.6 KiB
Lua
80 lines
2.6 KiB
Lua
ardour {
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["type"] = "EditorAction",
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name = "Polyphonic Audio to MIDI",
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license = "MIT",
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author = "Ardour Team",
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description = [[
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Analyze audio from the selected audio region to a selected MIDI region.
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A MIDI region on the target track will have to be created first (use the pen tool).
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This script uses the Polyphonic Transcription VAMP plugin from Queen Mary Univ, London.
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The plugin works best at 44.1KHz input sample rate, and is tuned for piano and guitar music. Velocity is not estimated.
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]]
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}
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function factory () return function ()
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local sel = Editor:get_selection ()
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local sr = Session:nominal_sample_rate ()
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local tm = Session:tempo_map ()
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local vamp = ARDOUR.LuaAPI.Vamp ("libardourvampplugins:qm-transcription", sr)
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local midi_region
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local audio_regions = {}
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local start_time = Session:current_end_sample ()
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local end_time = Session:current_start_sample ()
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for r in sel.regions:regionlist ():iter () do
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if r:to_midiregion():isnil() then
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local st = r:position()
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local ln = r:length()
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local et = st + ln
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if st < start_time then
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start_time = st
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end
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if et > end_time then
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end_time = et
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end
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table.insert(audio_regions, r)
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else
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midi_region = r:to_midiregion()
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end
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end
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assert (audio_regions and midi_region)
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midi_region:set_initial_position(start_time)
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midi_region:set_length(end_time - start_time, 0)
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for i,ar in pairs(audio_regions) do
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local a_off = ar:position ()
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local b_off = midi_region:quarter_note () - midi_region:start_beats ()
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vamp:analyze (ar:to_readable (), 0, nil)
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local fl = vamp:plugin ():getRemainingFeatures ():at (0)
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if fl and fl:size() > 0 then
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local mm = midi_region:midi_source(0):model()
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local midi_command = mm:new_note_diff_command ("Audio2Midi")
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for f in fl:iter () do
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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)
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local bs = tm:exact_qn_at_sample (a_off + ft, 0)
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local be = tm:exact_qn_at_sample (a_off + ft + fd, 0)
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local pos = Evoral.Beats (bs - b_off)
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local len = Evoral.Beats (be - bs)
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local note = ARDOUR.LuaAPI.new_noteptr (1, pos, len, fn + 1, 0x7f)
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midi_command:add (note)
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end
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mm:apply_command (Session, midi_command)
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end
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end
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end end
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function icon (params) return function (ctx, width, height, fg)
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local txt = Cairo.PangoLayout (ctx, "ArdourMono ".. math.ceil(width * .7) .. "px")
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txt:set_text ("\u{2669}") -- quarter note symbol UTF8
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local tw, th = txt:get_pixel_size ()
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ctx:set_source_rgba (ARDOUR.LuaAPI.color_to_rgba (fg))
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ctx:move_to (.5 * (width - tw), .5 * (height - th))
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txt:show_in_cairo_context (ctx)
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end end
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