97 lines
2.4 KiB
Lua
97 lines
2.4 KiB
Lua
ardour {
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["type"] = "dsp",
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name = "ACE Amplifier",
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category = "Amplifier",
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license = "MIT",
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author = "Ardour Community",
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description = [[Versatile +/- 20dB multichannel amplifier]]
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}
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function dsp_ioconfig ()
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return
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{
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-- -1, -1 = any number of channels as long as input and output count matches
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{ audio_in = -1, audio_out = -1},
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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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{
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{ ["type"] = "input", name = "Gain", min = -20, max = 20, default = 0, unit="dB"},
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}
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end
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local sr = 48000
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local cur_gain = 1
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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_out = outs
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n_audio = outs:n_audio ()
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assert (outs:n_midi () == 0)
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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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-- apply I/O map
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ARDOUR.DSP.process_map (bufs, n_out, 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_gain = ARDOUR.DSP.dB_to_coefficient (ctrl[1]) -- 10 ^ (0.05 * ctrl[1])
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local current_gain = cur_gain -- start with the same for all channels
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cur_gain = target_gain -- use target gain if no channel is mapped.
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for c = 1, n_audio do
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local ob = out_map:get (ARDOUR.DataType ("audio"), c - 1); -- get id of mapped output buffer for given cannel
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if (ob ~= ARDOUR.ChanMapping.Invalid) then
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cur_gain = ARDOUR.Amp.apply_gain (bufs:get_audio(ob), sr, n_samples, current_gain, target_gain, offset)
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end
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end
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--[[
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if current_gain ~= cur_gain then
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self:queue_draw () -- notify display
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end
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--]]
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end
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-------------------------------------------------------------------------------
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--- inline display + text example
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--[[
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local txt = nil -- cache pango context globally
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function render_inline (ctx, w, max_h)
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local ctrl = CtrlPorts:array () -- get control ports
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if not txt then
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-- allocate PangoLayout and set font
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--http://manual.ardour.org/lua-scripting/class_reference/#Cairo:PangoLayout
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txt = Cairo.PangoLayout (ctx, "Mono 8px")
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end
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txt:set_text (string.format ("%+.2f dB", ctrl[1]));
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tw, th = txt:get_pixel_size ()
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local h = th + 4 -- use text-height with 4px padding
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if (h > max_h) then h = max_h end -- but at most max-height
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-- clear background
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ctx:rectangle (0, 0, w, h)
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ctx:set_source_rgba (.2, .2, .2, 1.0)
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ctx:fill ()
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-- center text
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ctx:set_source_rgba (.8, .8, .8, 1.0)
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ctx:move_to (.5 * (w - tw), .5 * (h - th))
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txt:show_in_cairo_context (ctx)
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return {w, h}
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end
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--]]
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