1 files changed, 94 insertions, 0 deletions
diff --git a/share/scripts/singen.lua b/share/scripts/singen.lua
new file mode 100644
index 0000000000..8b22c1257b
--- /dev/null
+++ b/share/scripts/singen.lua
@@ -0,0 +1,94 @@
+ardour {
+	["type"]    = "dsp",
+	name        = "SinGen",
+	category    = "Instrument",
+	license     = "MIT",
+	author      = "Ardour Team",
+	description = [[Sine Wave Generator (v1.2)]]
+}
+
+local lpf = 0
+
+function dsp_params ()
+	return
+	{
+		{ ["type"] = "input", name = "Frequency", min = 20, max = 20000, default = 1000, unit="Hz", logarithmic = true },
+		{ ["type"] = "input", name = "Gain", min = -90, max = 0, default = -18, unit="dB" },
+	}
+end
+
+function dsp_ioconfig ()
+	return { [1] = { audio_in = -1, audio_out = -1}, }
+end
+
+function dsp_init (rate)
+	r = rate
+	lpf  = 2048 / rate
+end
+
+function low_pass_filter_param(old, new, limit)
+	if math.abs (old - new) < limit  then
+		return new
+	else
+		return old + lpf * (new - old)
+	end
+end
+
+local p  = 0
+local fo = 0
+local ao = 0
+
+function dsp_run (ins, outs, n_samples)
+	local ctrl = CtrlPorts:array() --call parameters
+	
+	local a = {} --init array
+	local f = ctrl[1] or 1000
+	local amp =  low_pass_filter_param(ao, ARDOUR.DSP.dB_to_coefficient(ctrl[2]), 0.02)
+	local inc = f / r
+
+	for s = 1, n_samples do --fill table with fragments of a sine wave
+		p = p + inc
+		a[s] = amp * math.sin(p * (2 * math.pi))
+	end
+	
+	for c = 1,#outs do
+		outs[c]:set_table(a, n_samples) --passes array into buffer
+	end
+	
+	if (f ~= fo) or (a ~= ao) then
+		self:queue_draw()
+	end
+	fo = f
+	ao = amp
+end
+
+function render_inline (ctx, w, max_h) --inline display
+	local ctrl = CtrlPorts:array()
+	h = 30
+	p = 0
+	inc = 1/w
+	f = ctrl[1] / 1000
+	if f < 0.5 then f = 0.5 end
+	if f > 8 then f  = 8 end
+	
+	--draw rectangle
+	ctx:rectangle(0, 0, w, h)
+	ctx:set_source_rgba(0, 0, 0, 1.0)
+	ctx:fill()
+	ctx:set_line_width(1.5)
+	ctx:set_source_rgba(0.8, 0.8, 0.8, 1.0)
+	
+	l_x = 0
+	l_y = 0
+	for x = 0,w do
+		y = ARDOUR.DSP.dB_to_coefficient(ctrl[2]) * math.sin(f * (2 * math.pi * (p)))
+		yc = 0.5 * h + ((-0.5 * h) * y)
+		ctx:move_to (x, yc + 3)
+		ctx:line_to (l_x, l_y + 3)
+		l_x = x
+		l_y = yc
+		ctx:stroke()
+		p = p + inc
+	end
+	return {w, h + 6}
+end
+\ No newline at end of file