59 lines
1.7 KiB
Lua
59 lines
1.7 KiB
Lua
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ardour { ["type"] = "EditorAction",
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name = "Normalize All Tracks",
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license = "MIT",
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author = "Ardour Team",
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description = [[Normalize all regions using a common gain-factor per track.]]
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}
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function factory () return function ()
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-- target values -- TODO: use a LuaDialog.Dialog and ask..
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local target_peak = -1 --dBFS
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local target_rms = -18 --dBFS/RMS
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-- prepare undo operation
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Session:begin_reversible_command ("Normalize Tracks")
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local add_undo = false -- keep track if something has changed
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-- loop over all tracks in the session
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for track in Session:get_tracks():iter() do
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local norm = 0 -- per track gain
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-- loop over all regions on track
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for r in track:to_track():playlist():region_list():iter() do
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-- test if it's an audio region
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local ar = r:to_audioregion ()
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if ar:isnil () then goto next end
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local peak = ar:maximum_amplitude (nil)
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local rms = ar:rms (nil)
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-- check if region is silent
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if (peak > 0) then
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local f_rms = rms / 10 ^ (.05 * target_rms)
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local f_peak = peak / 10 ^ (.05 * target_peak)
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local tg = (f_peak > f_rms) and f_peak or f_rms -- max (f_peak, f_rms)
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norm = (tg > norm) and tg or norm -- max (tg, norm)
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end
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::next::
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end
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-- apply same gain to all regions on track
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if norm > 0 then
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for r in track:to_track():playlist():region_list():iter() do
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local ar = r:to_audioregion ()
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if ar:isnil () then goto skip end
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ar:to_stateful ():clear_changes ()
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ar:set_scale_amplitude (1 / norm)
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add_undo = true
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::skip::
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end
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end
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end
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-- all done. now commit the combined undo operation
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if add_undo then
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-- the 'nil' command here means to use all collected diffs
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Session:commit_reversible_command (nil)
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else
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Session:abort_reversible_command ()
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end
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end end
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