48 lines
1.2 KiB
Lua
48 lines
1.2 KiB
Lua
ardour { ["type"] = "Snippet", name = "Readable Test" }
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function factory () return function ()
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local file = "/tmp/reverbs/Large Wide Echo Hall.wav"
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local rl = ARDOUR.Readable.load (Session, file)
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local cmem = ARDOUR.DSP.DspShm (8192)
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local d = cmem:to_float (0):array()
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for i = 1, 8192 do d[i] = 0 end
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d[1] = .5
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local ar = ARDOUR.AudioRom.new_rom (cmem:to_float (0), 8192)
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rl:push_back (ar)
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local c = 1
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for rd in rl:iter () do
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local n_samples = rd:readable_length ()
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assert (rd:n_channels () == 1)
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local peak = 0
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local pos = 0
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repeat
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-- read at most 8K samples starting at 'pos'
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local s = rd:read (cmem:to_float (0), pos, 8192, 0)
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pos = pos + s
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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]) > peak then
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peak = math.abs (d[i])
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end
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end
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until s < 8192
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assert (pos == n_samples)
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if (peak > 0) then
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print ("File:", file, "channel", c, "peak:", 20 * math.log (peak) / math.log(10), "dBFS")
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else
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print ("File:", file, "channel", c, " is silent")
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end
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c = c + 1;
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end
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end end
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