Readable and AudioROM Lua script examples

scripts/__convolv.lua

@@ -52,7 +52,7 @@ function dsp_run (ins, outs, n_samples)
 	end
 
 	if #outs == 1 then
-		conv:run (outs[1], n_samples)
+		conv:run_mono (outs[1], n_samples)
 	else
 		conv:run_stereo (outs[1], outs[2], n_samples)
 	end

scripts/__readable.lua

@@ -0,0 +1,47 @@
+ardour { ["type"] = "Snippet", name = "Readable Test" }
+
+function factory () return function ()
+
+	local file = "/tmp/reverbs/Large Wide Echo Hall.wav"
+	local rl = ARDOUR.Readable.load (Session, file)
+	local cmem = ARDOUR.DSP.DspShm (8192)
+
+	local d = cmem:to_float (0):array()
+	for i = 1, 8192 do d[i] = 0 end
+	d[1] = .5
+
+	local ar = ARDOUR.AudioRom.new_rom (cmem:to_float (0), 8192)
+
+	rl:push_back (ar)
+
+	local c = 1
+	for rd in rl:iter () do
+		local n_samples = rd:readable_length ()
+		assert (rd:n_channels () == 1)
+
+		local peak = 0
+		local pos = 0
+		repeat
+			-- read at most 8K samples starting at 'pos'
+			local s = rd:read (cmem:to_float (0), pos, 8192, 0)
+			pos = pos + s
+			-- access the raw audio data
+			-- http://manual.ardour.org/lua-scripting/class_reference/#C:FloatArray
+			local d = cmem:to_float (0):array()
+			-- iterate over the audio sample data
+			for i = 0, s do
+				if math.abs (d[i]) > peak then
+					peak = math.abs (d[i])
+				end
+			end
+		until s < 8192
+		assert (pos == n_samples)
+
+		if (peak > 0) then
+			print ("File:", file, "channel", c, "peak:", 20 * math.log (peak) / math.log(10), "dBFS")
+		else
+			print ("File:", file, "channel", c, " is silent")
+		end
+		c = c + 1;
+	end
+end end

scripts/_fir.lua

@@ -0,0 +1,36 @@
+ardour { ["type"] = "dsp", name = "Lua FIR Convolver", license = "MIT", author = "Ardour Lua Task Force", description = [[Another simple DSP example]] }
+
+function dsp_ioconfig () return
+	{
+		{ audio_in = 1, audio_out = 1},
+	}
+end
+
+local conv
+
+function dsp_configure (ins, outs)
+	conv = ARDOUR.DSP.Convolution (Session, ins:n_audio (), outs:n_audio ())
+
+	local cmem = ARDOUR.DSP.DspShm (4)
+	cmem:clear ()
+	local d = cmem:to_float (0):array()
+	d[1] = .5
+	d[2] = .5
+	local ar = ARDOUR.AudioRom.new_rom (cmem:to_float (0), 4)
+	conv:add_impdata (0, 0, ar, 1.0, 0, 0, 0, 0)
+
+	cmem:to_float (0):set_table({1, -1, 0, 0}, 4)
+	ar = ARDOUR.AudioRom.new_rom (cmem:to_float (0), 3)
+	conv:add_impdata (0, 0, ar, 1.0, 0, 0, 0, 0)
+
+	conv:restart ()
+	collectgarbage ()
+end
+
+function dsp_latency ()
+	return conv:latency()
+end
+
+function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
+	conv:run (bufs, in_map, out_map, n_samples, offset)
+end