88 lines
2.9 KiB
Lua
88 lines
2.9 KiB
Lua
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ardour {
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["type"] = "dsp",
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name = "ACE 5.1 to Stereo",
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category = "Amplifier",
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license = "MIT",
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author = "Ardour Community",
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description = [[Downmix 5.1 Surround to Stereo]]
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}
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function dsp_ioconfig ()
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return {
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connect_all_audio_outputs = true, -- override strict-i/o
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{ audio_in = 6, audio_out = 2},
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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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{ ["type"] = "input", name = "Channel Layout", min = 0, max = 1, default = 0, enum = true, scalepoints =
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{
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["L R C LFE Ls Rs"] = 0,
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["L C R Ls Lr LFE"] = 1,
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}
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},
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{ ["type"] = "input", name = "Normalize", min = 0, max = 1, default = 0, toggled = true },
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{ ["type"] = "input", name = "Include LFE", min = 0, max = 1, default = 0, toggled = true },
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}
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end
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-- see ATSCA/52:2018 Chapter 7.8.2
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clev = 0.707945784 -- -3dB
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slev = 0.707945784 -- -3dB
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norm = 1.0 / (1 + clev + slev)
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normlf = 1.0 / (1 + 2 * clev + slev)
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-- the DSP callback function
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function dsp_run (ins, outs, n_samples)
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local ctrl = CtrlPorts:array() -- get control port array
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assert (#ins == 6)
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assert (#outs == 2)
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if ctrl[1] == 0 then
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-- L R C LFE Ls Rs
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if ins[1] ~= outs[1] then
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ARDOUR.DSP.copy_vector (outs[1], ins[1], n_samples) -- left to left
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end
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if ins[2] ~= outs[2] then
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ARDOUR.DSP.copy_vector (outs[2], ins[2], n_samples) -- right to right
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end
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ARDOUR.DSP.mix_buffers_with_gain (outs[1], ins[3], n_samples, clev) -- C to left
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ARDOUR.DSP.mix_buffers_with_gain (outs[2], ins[3], n_samples, clev) -- C to right
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ARDOUR.DSP.mix_buffers_with_gain (outs[1], ins[5], n_samples, slev) -- Ls
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ARDOUR.DSP.mix_buffers_with_gain (outs[2], ins[6], n_samples, slev) -- Rs
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if ctrl[3] > 0 then
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ARDOUR.DSP.mix_buffers_with_gain (outs[1], ins[4], n_samples, clev) -- LFE to left
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ARDOUR.DSP.mix_buffers_with_gain (outs[2], ins[4], n_samples, clev) -- LFE to right
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end
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else
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-- L C R Ls Rs LFE
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if ins[1] ~= outs[1] then
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ARDOUR.DSP.copy_vector (outs[1], ins[1], n_samples) -- left to left
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end
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if ins[2] ~= outs[2] then
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ARDOUR.DSP.copy_vector (outs[2], ins[2], n_samples) -- copy center
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end
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ARDOUR.DSP.apply_gain_to_buffer (outs[2], n_samples, clev); -- C to right
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ARDOUR.DSP.mix_buffers_no_gain (outs[1], outs[2], n_samples) -- C to left
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ARDOUR.DSP.mix_buffers_no_gain (outs[2], ins[3], n_samples) -- right to right
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ARDOUR.DSP.mix_buffers_with_gain (outs[1], ins[4], n_samples, slev) -- Ls
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ARDOUR.DSP.mix_buffers_with_gain (outs[2], ins[5], n_samples, slev) -- Rs
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if ctrl[3] > 0 then
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ARDOUR.DSP.mix_buffers_with_gain (outs[1], ins[6], n_samples, clev) -- LFE to left
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ARDOUR.DSP.mix_buffers_with_gain (outs[2], ins[6], n_samples, clev) -- LFE to right
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end
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end
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if ctrl[2] > 0 then
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if ctrl[3] > 0 then
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ARDOUR.DSP.apply_gain_to_buffer (outs[1], n_samples, normlf);
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ARDOUR.DSP.apply_gain_to_buffer (outs[2], n_samples, normlf);
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else
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ARDOUR.DSP.apply_gain_to_buffer (outs[1], n_samples, norm);
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ARDOUR.DSP.apply_gain_to_buffer (outs[2], n_samples, norm);
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end
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end
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end
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