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ardour { | ||
["type"] = "dsp", | ||
name = "ACE Stereo Routing", | ||
category = "Utility", | ||
license = "MIT", | ||
author = "Ardour Community", | ||
description = [[Stereo Signal Routing, re-assign or mix channels. This is a drop-in replacement for https://x42-plugins.com/x42/x42-stereoroute]] | ||
} | ||
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function dsp_ioconfig () | ||
return { { audio_in = 2, audio_out = 2} } | ||
end | ||
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function dsp_params () | ||
return { | ||
{ ["type"] = "input", name = "Mode", min = 0, max = 8, default = 0, enum = true, scalepoints = | ||
{ | ||
["No-OP: L->L, R->R (Straight Bypass)"] = 0, | ||
["Downmix to Mono -3dB (Equal Power)"] = 1, | ||
["Downmix to Mono -6dB (Equal Amplitude)"] = 2, | ||
["Downmix to Mono -0dB (Sum Channels)"] = 3, | ||
["Route Left Only: L->L, L->R"] = 4, | ||
["Route Right Only: R->R, R->L"] = 5, | ||
["Swap Channels: L->R, R->L"] = 6, | ||
["M/S: (L+R)/2, (L-R)/2 (to Mid/Side)"] = 7, | ||
["M/S: (L+R), (L-R) (from Mid/Side)"] = 8, | ||
} | ||
} | ||
} | ||
end | ||
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function dsp_init (rate) | ||
cmem = ARDOUR.DSP.DspShm (8192) | ||
end | ||
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function copy_no_inplace (ins, outs, n_samples) | ||
assert (#ins == #outs) | ||
for c = 1, #outs do | ||
if ins[c] ~= outs[c] then | ||
ARDOUR.DSP.copy_vector (outs[c], ins[c], n_samples) -- ..copy data from input to output. | ||
end | ||
end | ||
end | ||
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function dsp_run (ins, outs, n_samples) | ||
assert (n_samples <= 8192) | ||
local ctrl = CtrlPorts:array() | ||
local m = ctrl[1] | ||
if (m < 1) then | ||
-- NO-OP | ||
copy_no_inplace (ins, outs, n_samples) | ||
elseif (m < 2) then | ||
-- Sum to Mono -3dB | ||
copy_no_inplace (ins, outs, n_samples) | ||
ARDOUR.DSP.mix_buffers_no_gain (outs[1], outs[2], n_samples) | ||
ARDOUR.DSP.apply_gain_to_buffer (outs[1], n_samples, 0.707945784); | ||
ARDOUR.DSP.copy_vector (outs[2], outs[1], n_samples) | ||
elseif (m < 3) then | ||
-- Sum to Mono -6dB | ||
copy_no_inplace (ins, outs, n_samples) | ||
ARDOUR.DSP.mix_buffers_no_gain (outs[1], outs[2], n_samples) | ||
ARDOUR.DSP.apply_gain_to_buffer (outs[1], n_samples, 0.5); | ||
ARDOUR.DSP.copy_vector (outs[2], outs[1], n_samples) | ||
elseif (m < 4) then | ||
-- Sum to Mono | ||
copy_no_inplace (ins, outs, n_samples) | ||
ARDOUR.DSP.mix_buffers_no_gain (outs[1], outs[2], n_samples) | ||
ARDOUR.DSP.copy_vector (outs[2], outs[1], n_samples) | ||
elseif (m < 5) then | ||
-- Left only | ||
if ins[1] ~= outs[1] then | ||
ARDOUR.DSP.copy_vector (outs[1], ins[1], n_samples) | ||
end | ||
ARDOUR.DSP.copy_vector (outs[2], outs[1], n_samples) | ||
elseif (m < 6) then | ||
-- Right only | ||
if ins[2] ~= outs[2] then | ||
ARDOUR.DSP.copy_vector (outs[2], ins[2], n_samples) | ||
end | ||
ARDOUR.DSP.copy_vector (outs[1], outs[2], n_samples) | ||
elseif (m < 7) then | ||
-- Swap channels | ||
ARDOUR.DSP.copy_vector (cmem:to_float(0), ins[1], n_samples) | ||
ARDOUR.DSP.copy_vector (outs[1], ins[2], n_samples) | ||
ARDOUR.DSP.copy_vector (outs[2], cmem:to_float(0), n_samples) | ||
elseif (m < 8) then | ||
-- to Mid/Side | ||
ARDOUR.DSP.copy_vector (cmem:to_float(0), ins[1], n_samples) | ||
ARDOUR.DSP.mix_buffers_with_gain (cmem:to_float(0), ins[2], n_samples, -1) -- (L - R) | ||
if ins[1] ~= outs[1] then | ||
ARDOUR.DSP.copy_vector (outs[1], ins[1], n_samples) | ||
end | ||
ARDOUR.DSP.mix_buffers_no_gain (outs[1], ins[2], n_samples) -- (L + R) | ||
ARDOUR.DSP.copy_vector (outs[2], cmem:to_float(0), n_samples) | ||
ARDOUR.DSP.apply_gain_to_buffer (outs[1], n_samples, 0.5); | ||
ARDOUR.DSP.apply_gain_to_buffer (outs[2], n_samples, 0.5); | ||
else | ||
-- from Mid/Side | ||
ARDOUR.DSP.copy_vector (cmem:to_float(0), ins[1], n_samples) | ||
ARDOUR.DSP.mix_buffers_with_gain (cmem:to_float(0), ins[2], n_samples, -1) -- (L - R) | ||
if ins[1] ~= outs[1] then | ||
ARDOUR.DSP.copy_vector (outs[1], ins[1], n_samples) | ||
end | ||
ARDOUR.DSP.mix_buffers_no_gain (outs[1], ins[2], n_samples) -- (L + R) | ||
ARDOUR.DSP.copy_vector (outs[2], cmem:to_float(0), n_samples) | ||
end | ||
end |