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