76 lines
2.1 KiB
Lua
76 lines
2.1 KiB
Lua
ardour {
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["type"] = "EditorAction",
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name = "Find non zero audio sample",
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author = "Ardour Team",
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description = [[Find the position of first non-zero audio sample in selected regions.]]
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}
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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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-- allocate a buffer (float* in C)
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-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:DSP:DspShm
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local cmem = ARDOUR.DSP.DspShm (8192)
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local msg = ""
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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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if r:to_audioregion ():isnil () then
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goto next
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end
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-- to read the Region data, we use the Readable interface of the Region
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-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:Readable
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local rd = r:to_readable ()
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local n_samples = rd:readable_length ()
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local n_channels = rd:n_channels ()
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local nonzeropos = -1
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-- iterate over all channels in Audio Region
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for c = 0, n_channels -1 do
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local pos = 0
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repeat
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-- read at most 8K samples of channel 'c' starting at 'pos'
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local s = rd:read (cmem:to_float (0), pos, 8192, c)
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-- access the raw audio data
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-- http://manual.ardour.org/lua-scripting/class_reference/#C:FloatArray
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local d = cmem:to_float (0):array()
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-- iterate over the audio sample data
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for i = 0, s do
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if math.abs (d[i]) > 0 then
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print ("nonzero at", pos + i)
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if (nonzeropos < 0 or pos + i < nonzeropos) then
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nonzeropos = pos + i
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end
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break
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end
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end
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pos = pos + s
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if (nonzeropos >= 0 and pos > nonzeropos) then
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break
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end
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until s < 8192
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end
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if (nonzeropos >= 0) then
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msg = msg .. string.format("%s: %d\n", r:name (), nonzeropos + r:position())
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else
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msg = msg .. "Region: '%s' is silent\n"
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end
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::next::
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end
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if (msg ~= "") then
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local md = LuaDialog.Message ("First Non Zero Sample", msg, LuaDialog.MessageType.Info, LuaDialog.ButtonType.Close)
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print (md:run())
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end
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end end
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