3 name = "Voice/Level Activate",
6 author = "Robin Gareus",
7 authoremail = "robin@gareus.org",
8 site = "http://gareus.org",
10 An Example Audio Plugin that rolls the transport
11 when the signal level on the plugin's input exceeds a given threshold.]]
14 function dsp_ioconfig ()
17 -- support all in/out as long as input port count equals output port count
18 { audio_in = -1, audio_out = -1},
22 function dsp_params ()
25 { ["type"] = "input", name = "Threshold", min = -20, max = 0, default = -6, doc = "Threshold in dBFS for all channels" },
26 { ["type"] = "output", name = "Level", min = -120, max = 0 },
30 function dsp_configure (ins, outs)
31 n_channels = ins:n_audio()
34 function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
35 local ctrl = CtrlPorts:array() -- get control port array (read/write)
37 if Session:transport_rolling() then
38 -- don't do anything if the transport is already rolling
39 ctrl[2] = -math.huge -- set control output port value
43 local threshold = 10 ^ (.05 * ctrl[1]) -- dBFS to coefficient
44 local level = -math.huge
46 for c = 1,n_channels do
47 local b = in_map:get(ARDOUR.DataType("audio"), c - 1) -- get id of audio-buffer for the given channel
48 if b ~= ARDOUR.ChanMapping.Invalid then -- check if channel is mapped
49 local a = ARDOUR.DSP.compute_peak(bufs:get_audio(b):data(offset), n_samples, 0) -- compute digital peak
51 Session:request_transport_speed(1.0, true)
53 if a > level then level = a end -- max level of all channels
56 ctrl[2] = ARDOUR.DSP.accurate_coefficient_to_dB (level) -- set control output port value