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