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ardour {
["type"] = "dsp",
name = "a-Gain Ratio",
category = "Amplifier",
license = "MIT",
author = "Ardour Team",
description = [[Multichannel amplifier with gain coefficient ratio (not dezippered). Beware this plugin allows for significant gain ratios, it's intended to academic purposes.]]
}
function dsp_ioconfig ()
return
{
-- -1, -1 = any number of channels as long as input and output count matches
{ audio_in = -1, audio_out = -1},
}
end
function dsp_params ()
return
{
{ ["type"] = "input", name = "Gain Coefficient numerator", min = 0, max = 1048576, default = 1, unit="", logarithmic = true},
{ ["type"] = "input", name = "Gain coefficient denominator", min = 1, max = 1048576, default = 1, unit="", logarithmic = true},
}
end
local sr = 48000
local cur_gain = 0.0
function dsp_init (rate)
sr = rate
end
function dsp_configure (ins, outs)
n_out = outs
n_audio = outs:n_audio ()
end
function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
local ctrl = CtrlPorts:array()
local gain = ctrl[1] / ctrl[2]
ARDOUR.DSP.process_map (bufs, n_out, in_map, out_map, n_samples, offset)
for c = 1, n_audio do
local ob = out_map:get (ARDOUR.DataType ("audio"), c - 1); -- get id of mapped output buffer for given cannel
if (ob ~= ARDOUR.ChanMapping.Invalid) then
bufs:get_audio (ob):apply_gain (gain, n_samples);
end
end
end
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