1 files changed, 53 insertions, 0 deletions
diff --git a/share/scripts/voice_activate.lua b/share/scripts/voice_activate.lua
new file mode 100644
index 0000000000..ef4380b9bb
--- /dev/null
+++ b/share/scripts/voice_activate.lua
@@ -0,0 +1,53 @@
+ardour {
+	["type"]    = "dsp",
+	name        = "Voice/Level Activate",
+	category    = "Utility",
+	author      = "Ardour Lua Task Force",
+	license     = "MIT",
+	description = [[Roll the transport when the signal level on the plugin's input exceeds a given threshold.]]
+}
+
+function dsp_ioconfig ()
+	return
+	{
+		-- support all in/out as long as input port count equals output port count
+		{ audio_in = -1, audio_out = -1},
+	}
+end
+
+function dsp_params ()
+	return
+	{
+		{ ["type"] = "input", name = "Threshold", min = -20, max = 0, default = -6, doc = "Threshold in dBFS for all channels" },
+		{ ["type"] = "output", name = "Level", min = -120, max = 0 },
+	}
+end
+
+function dsp_configure (ins, outs)
+	n_channels = ins:n_audio()
+end
+
+function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
+	local ctrl = CtrlPorts:array() -- get control port array (read/write)
+
+	if Session:transport_rolling() then
+		-- don't do anything if the transport is already rolling
+		ctrl[2] = -math.huge -- set control output port value
+		return
+	end
+
+	local threshold = 10 ^ (.05 * ctrl[1]) -- dBFS to coefficient
+	local level = -math.huge
+
+	for c = 1,n_channels do
+		local b = in_map:get(ARDOUR.DataType("audio"), c - 1) -- get id of audio-buffer for the given channel
+		if b ~= ARDOUR.ChanMapping.Invalid then -- check if channel is mapped
+			local a = ARDOUR.DSP.compute_peak(bufs:get_audio(b):data(offset), n_samples, 0) -- compute digital peak
+			if a > threshold then
+					Session:request_transport_speed (1.0, true, ARDOUR.TransportRequestSource.TRS_UI)
+			end
+			if a > level then level = a end -- max level of all channels
+		end
+	end
+	ctrl[2] = ARDOUR.DSP.accurate_coefficient_to_dB (level) -- set control output port value
+end