ardour/livetrax
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Lua example script: fix some typos and add some comments

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This commit is contained in:
Robin Gareus 2016-02-27 14:56:36 +01:00
parent 8032208656
commit 38c15c0714
1 changed files with 16 additions and 9 deletions
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25
scripts/voice_activate.lua
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@ -7,12 +7,13 @@ ardour {
site = "http://gareus.org",
description = [[
An Example Audio Plugin that rolls the transport
when the signal level on the plugin's input a given threshold.]]
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
@ -26,24 +27,30 @@ function dsp_params ()
end
function dsp_configure (ins, outs)
n_channels = ins:n_audio();
n_channels = ins:n_audio()
end
-- use ardour's vectorized functions
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 ctrl[2] = -math.huge return end
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 buffer for given cannel
if b ~= ARDOUR.ChanMapping.Invalid then
local a = ARDOUR.DSP.compute_peak(bufs:get_audio(b):data(offset), n_samples, 0)
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)
end
if a > level then level = a end
if a > level then level = a end -- max level of all channels
end
end
ctrl[2] = ARDOUR.DSP.accurate_coefficient_to_dB (level)
ctrl[2] = ARDOUR.DSP.accurate_coefficient_to_dB (level) -- set control output port value
end