109 lines
3.0 KiB
Lua
109 lines
3.0 KiB
Lua
ardour {
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["type"] = "dsp",
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name = "ACE Cross Fade",
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category = "Amplifier",
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license = "MIT",
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author = "Ardour Community",
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description = [[Automatable Crossfade. Channels are grouped:
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Mono out: In 1/2 -> Out 1
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Stereo out: In 1/3 -> Out 1, In 2/4 -> Out 2
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Quad out: In 1/5 -> Out 1, In 2/6 -> Out 2, In 3/7 -> Out 3, In 4/8 -> Out 4
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]]
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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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-- in theory any combination with N_in = 2 * N_out is possible
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{ audio_in = 2, audio_out = 1},
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{ audio_in = 4, audio_out = 2},
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{ audio_in = 8, audio_out = 4},
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}
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end
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function dsp_params ()
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return { { ["type"] = "input", name = "A/B", min = 0, max = 1, default = 0} }
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end
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local sr = 48000
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local cur_a = 0.0
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local cur_b = 0.0
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local n_aout = 0
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function dsp_init (rate)
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sr = rate
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end
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function dsp_configure (ins, outs)
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n_ainp = ins:n_audio ()
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n_aout = outs:n_audio ()
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assert (n_aout * 2 == n_ainp)
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end
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-- the DSP callback function
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function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
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local ctrl = CtrlPorts:array() -- get control port array
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local target_B = ctrl[1]
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local target_A = 1 - target_B
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local gA = cur_a
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local gB = cur_b
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for c = 1, n_aout do
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local o = out_map:get (ARDOUR.DataType ("audio"), c - 1)
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if o == ARDOUR.ChanMapping.Invalid then
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goto next
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end
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local in_a = c
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local in_b = c + n_aout
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local ia = in_map:get (ARDOUR.DataType ("audio"), in_a - 1)
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local ib = in_map:get (ARDOUR.DataType ("audio"), in_b - 1)
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local buf_aout = bufs:get_audio(o)
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-- optimize hard A/B fixed gain case (copy buffers)
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if cur_a == target_A and cur_b == target_B then
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if target_A == 1.0 then
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if ia == ARDOUR.ChanMapping.Invalid then
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buf_aout:silence (n_samples, offset)
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elseif buf_aout ~= bufs:get_audio(ia) then
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buf_aout:read_from (bufs:get_audio(ia):data (0), n_samples, offset, offset)
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end
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goto next
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elseif target_B == 1.0 then
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if ib == ARDOUR.ChanMapping.Invalid then
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buf_aout:silence (n_samples, offset)
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else
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assert (buf_aout ~= bufs:get_audio(ib))
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buf_aout:read_from (bufs:get_audio(ib):data (0), n_samples, offset, offset)
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end
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goto next
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end
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end
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-- apply gain to each input channel in-place
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if ia ~= ARDOUR.ChanMapping.Invalid and ia ~= ib then
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cur_a = ARDOUR.Amp.apply_gain (bufs:get_audio(ia), sr, n_samples, gA, target_A, offset)
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end
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if ib ~= ARDOUR.ChanMapping.Invalid and ia ~= ib then
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cur_b = ARDOUR.Amp.apply_gain (bufs:get_audio(ib), sr, n_samples, gB, target_B, offset)
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end
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-- copy input to output if needed (first set of channels may be in-place)
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if ia == ARDOUR.ChanMapping.Invalid then
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buf_aout:silence (n_samples, offset)
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elseif buf_aout ~= bufs:get_audio(ia) then
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buf_aout:read_from (bufs:get_audio(ia):data (0), n_samples, offset, offset)
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end
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-- add the second buffer
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if ib ~= ARDOUR.ChanMapping.Invalid then
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ARDOUR.DSP.mix_buffers_no_gain (buf_aout:data (offset), bufs:get_audio(ib):data (offset), n_samples)
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end
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::next::
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end
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end
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