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Add Lua DSP processor to downmix 5.1 to stereo

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This commit is contained in:
Robin Gareus 2023-04-24 01:59:50 +02:00
parent 649ad0f052
commit c3f65a2237
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 87 additions and 0 deletions
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share/scripts/surround_to_stereo.lua Normal file
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ardour {
["type"] = "dsp",
name = "ACE 5.1 to Stereo",
category = "Amplifier",
license = "MIT",
author = "Ardour Community",
description = [[Downmix 5.1 Surround to Stereo]]
}
function dsp_ioconfig ()
return {
connect_all_audio_outputs = true, -- override strict-i/o
{ audio_in = 6, audio_out = 2},
}
end
function dsp_params ()
return {
{ ["type"] = "input", name = "Channel Layout", min = 0, max = 1, default = 0, enum = true, scalepoints =
{
["L R C LFE Ls Rs"] = 0,
["L C R Ls Lr LFE"] = 1,
}
},
{ ["type"] = "input", name = "Normalize", min = 0, max = 1, default = 0, toggled = true },
{ ["type"] = "input", name = "Include LFE", min = 0, max = 1, default = 0, toggled = true },
}
end
-- see ATSCA/52:2018 Chapter 7.8.2
clev = 0.707945784 -- -3dB
slev = 0.707945784 -- -3dB
norm = 1.0 / (1 + clev + slev)
normlf = 1.0 / (1 + 2 * clev + slev)
-- the DSP callback function
function dsp_run (ins, outs, n_samples)
local ctrl = CtrlPorts:array() -- get control port array
assert (#ins == 6)
assert (#outs == 2)
if ctrl[1] == 0 then
-- L R C LFE Ls Rs
if ins[1] ~= outs[1] then
ARDOUR.DSP.copy_vector (outs[1], ins[1], n_samples) -- left to left
end
if ins[2] ~= outs[2] then
ARDOUR.DSP.copy_vector (outs[2], ins[2], n_samples) -- right to right
end
ARDOUR.DSP.mix_buffers_with_gain (outs[1], ins[3], n_samples, clev) -- C to left
ARDOUR.DSP.mix_buffers_with_gain (outs[2], ins[3], n_samples, clev) -- C to right
ARDOUR.DSP.mix_buffers_with_gain (outs[1], ins[5], n_samples, slev) -- Ls
ARDOUR.DSP.mix_buffers_with_gain (outs[2], ins[6], n_samples, slev) -- Rs
if ctrl[3] > 0 then
ARDOUR.DSP.mix_buffers_with_gain (outs[1], ins[4], n_samples, clev) -- LFE to left
ARDOUR.DSP.mix_buffers_with_gain (outs[2], ins[4], n_samples, clev) -- LFE to right
end
else
-- L C R Ls Rs LFE
if ins[1] ~= outs[1] then
ARDOUR.DSP.copy_vector (outs[1], ins[1], n_samples) -- left to left
end
if ins[2] ~= outs[2] then
ARDOUR.DSP.copy_vector (outs[2], ins[2], n_samples) -- copy center
end
ARDOUR.DSP.apply_gain_to_buffer (outs[2], n_samples, clev); -- C to right
ARDOUR.DSP.mix_buffers_no_gain (outs[1], outs[2], n_samples) -- C to left
ARDOUR.DSP.mix_buffers_no_gain (outs[2], ins[3], n_samples) -- right to right
ARDOUR.DSP.mix_buffers_with_gain (outs[1], ins[4], n_samples, slev) -- Ls
ARDOUR.DSP.mix_buffers_with_gain (outs[2], ins[5], n_samples, slev) -- Rs
if ctrl[3] > 0 then
ARDOUR.DSP.mix_buffers_with_gain (outs[1], ins[6], n_samples, clev) -- LFE to left
ARDOUR.DSP.mix_buffers_with_gain (outs[2], ins[6], n_samples, clev) -- LFE to right
end
end
if ctrl[2] > 0 then
if ctrl[3] > 0 then
ARDOUR.DSP.apply_gain_to_buffer (outs[1], n_samples, normlf);
ARDOUR.DSP.apply_gain_to_buffer (outs[2], n_samples, normlf);
else
ARDOUR.DSP.apply_gain_to_buffer (outs[1], n_samples, norm);
ARDOUR.DSP.apply_gain_to_buffer (outs[2], n_samples, norm);
end
end
end