64 lines
1.9 KiB
Lua
64 lines
1.9 KiB
Lua
ardour { ["type"] = "Snippet", name = "Normalize Regions" }
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function factory () return function ()
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-- get Editor GUI Selection
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-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:Selection
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local sel = Editor:get_selection ()
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-- prepare undo operation
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Session:begin_reversible_command ("Lua Normalize")
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local add_undo = false -- keep track if something has changed
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-- iterate over selected regions
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-- http://manual.ardour.org/lua-scripting/class_reference/#ArdourUI:RegionSelection
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for r in sel.regions:regionlist ():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
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goto next
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end
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local peak = ar:maximum_amplitude (nil);
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local rms = ar:rms (nil);
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if (peak > 0) then
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print ("Region:", r:name (), "peak:", 20 * math.log (peak) / math.log(10), "dBFS")
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print ("Region:", r:name (), "rms :", 20 * math.log (rms) / math.log(10), "dBFS")
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else
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print ("Region:", r:name (), " is silent")
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end
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-- normalize region
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if (peak > 0) then
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-- prepare for undo
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r:to_stateful ():clear_changes ()
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-- calculate gain.
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local f_rms = rms / 10 ^ (.05 * -18) -- -18dBFS/RMS
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local f_peak = peak / 10 ^ (.05 * -1) -- -1dbFS/peak
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-- apply gain
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if (f_rms > f_peak) then
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print ("Region:", r:name (), "RMS normalized by:", -20 * math.log (f_rms) / math.log(10), "dB")
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ar:set_scale_amplitude (1 / f_rms)
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else
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print ("Region:", r:name (), "peak normalized by:", -20 * math.log (f_peak) / math.log(10), "dB")
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ar:set_scale_amplitude (1 / f_peak)
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end
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-- save changes (if any) to undo command
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if not Session:add_stateful_diff_command (r:to_statefuldestructible ()):empty () then
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add_undo = true
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end
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end
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::next::
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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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