remove old a-Hi/Low pass

1 files changed, 0 insertions, 285 deletions

diff --git a/scripts/hplp.lua b/scripts/hplp.lua
deleted file mode 100644
index 52597cb18b..0000000000
--- a/scripts/hplp.lua
+++ /dev/null
@@ -1,285 +0,0 @@
-ardour {
-	["type"]    = "dsp",
-	name        = "a-High/Low Pass Filter",
-	category    = "Filter",
-	license     = "MIT",
-	author      = "Ardour Team",
-	description = [[Example Ardour Lua DSP Plugin]]
-}
-
-function dsp_ioconfig ()
-	return
-	{
-		-- allow any number of I/O as long as port-count matches
-		{ audio_in = -1, audio_out = -1},
-	}
-end
-
-
-function dsp_params ()
-	return
-	{
-		{ ["type"] = "input", name = "Type", min = 0, max = 1, default = 0, enum = true, scalepoints =
-			{
-				["High Pass"]  = 0,
-				["Low Pass"]   = 1,
-			}
-		},
-		{ ["type"] = "input", name = "Steepness", min = 1, max = 4, default = 1, enum = true, scalepoints =
-			{
-				["12dB/oct"] = 1,
-				["24dB/oct"] = 2,
-				["36dB/oct"] = 3,
-				["48dB/oct"] = 4,
-			}
-		},
-		{ ["type"] = "input", name = "Cut off frequency", min =   5, max = 20000, default = 1000, unit="Hz", logarithmic = true },
-		{ ["type"] = "input", name = "Resonance",         min = 0.1, max = 8,     default = .707, logarithmic = true },
-	}
-end
-
--- translate type parameter to DSP enum
--- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR.DSP.Biquad.Type
-function map_type (t)
-	if     t == 1 then
-		return ARDOUR.DSP.BiquadType.LowPass
-	else
-		return ARDOUR.DSP.BiquadType.HighPass
-	end
-end
-
--- these globals are *not* shared between DSP and UI
-local filters = {}  -- the biquad filter instances (DSP)
-local filt -- the biquad filter instance (GUI, response)
-local cur = {0, 0, 0, 0} -- current parameters
-local lpf = 0.03 -- parameter low-pass filter time-constant
-local chn = 0 -- channel/filter count
-
-function dsp_init (rate)
-	self:shmem ():allocate (1) -- shared mem to tell the GUI the samplerate
-	local cfg = self:shmem ():to_int (0):array ()
-	cfg[1] = rate
-	lpf = 13000 / rate -- interpolation time constant
-end
-
-function dsp_configure (ins, outs)
-	assert (ins:n_audio () == outs:n_audio ())
-	local cfg = self:shmem ():to_int (0):array ()
-	local rate = cfg[1]
-	chn = ins:n_audio ()
-	for c = 1, chn do
-		filters[c] = {}
-		-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:DSP:Biquad
-		for k = 1,4 do
-			filters[c][k] = ARDOUR.DSP.Biquad (rate) -- initialize filters
-		end
-	end
-	cur = {0, 0, 0, 0}
-end
-
--- helper functions for parameter interpolation
-function param_changed (ctrl)
-	if math.floor(ctrl[1]) == math.floor(cur[1]) and math.floor(ctrl[2]) == math.floor(cur[2]) and ctrl[3] == cur[3] and ctrl[4] == cur[4] then
-		return false
-	end
-	return true
-end
-
-function low_pass_filter_param (old, new, limit)
-	if math.abs (old - new) < limit  then
-		return new
-	else
-		return old + lpf * (new - old)
-	end
-end
-
--- apply parameters, re-compute filter coefficients if needed
-function apply_params (ctrl)
-	if not param_changed (ctrl) then
-		return
-	end
-
-	if cur[1] ~= ctrl[1] or cur[2] ~= ctrl[2] then
-		-- reset filter state when type or order changes
-		for c = 1, chn do
-			for k = 1,4 do
-				filters[c][k]:reset ()
-			end
-		end
-		for k = 1,4 do cur[k] = ctrl[k] end
-	else
-		-- low-pass filter ctrl parameter values, smooth transition
-		cur[3] = low_pass_filter_param (cur[3], ctrl[3], 1.0) -- freq/Hz
-		cur[4] = low_pass_filter_param (cur[4], ctrl[4], 0.01) -- quality
-	end
-
-	if cur[2] < 1 then cur[2] = 1 end
-	if cur[2] > 4 then cur[2] = 4 end
-
-	for c = 1, chn do
-		for k = 1,4 do
-			filters[c][k]:compute (map_type (cur[1]), cur[3], cur[4], 0)
-		end
-	end
-end
-
-
--- the actual DSP callback
-function dsp_run (ins, outs, n_samples)
-	local changed = false
-	local siz = n_samples
-	local off = 0
-
-	-- if a parameter was changed, process at most 64 samples at a time
-	-- and interpolate parameters until the current settings match
-	-- the target values
-	if param_changed (CtrlPorts:array ()) then
-		changed = true
-		siz = 64
-	end
-
-	local o = math.floor(cur[2])
-
-	while n_samples > 0 do
-		if changed then apply_params (CtrlPorts:array ()) end
-		if siz > n_samples then siz = n_samples end
-
-		-- process all channels
-		for c = 1,#ins do
-			-- check if output and input buffers for this channel are identical
-			-- http://manual.ardour.org/lua-scripting/class_reference/#C:FloatArray
-			if not ins[c]:sameinstance (outs[c]) then
-				-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:DSP
-				ARDOUR.DSP.copy_vector (outs[c]:offset (off), ins[c]:offset (off), siz)
-			end
-			for k = 1,o do
-				filters[c][k]:run (outs[c]:offset (off), siz) -- in-place processing
-			end
-		end
-
-		n_samples = n_samples - siz
-		off = off + siz
-	end
-
-	if changed then
-		-- notify display
-		self:queue_draw ()
-	end
-end
-
-
--------------------------------------------------------------------------------
---- inline display
-
-function round (n)
-	return math.floor (n + .5)
-end
-
-function freq_at_x (x, w)
-	-- x-axis pixel for given freq, power-scale
-	return 20 * 1000 ^ (x / w)
-end
-
-function x_at_freq (f, w)
-	-- frequency at given x-axis pixel
-	return w * math.log (f / 20.0) / math.log (1000.0)
-end
-
-function db_to_y (db, h)
-	-- y-axis gain mapping
-	if db < -60 then db = -60 end
-	if db >  12 then db =  12 end
-	return -.5 + round (0.2 * h) - h * db / 60
-end
-
-function grid_db (ctx, w, h, db)
-	-- draw horizontal grid line
-	local y = -.5 + round (db_to_y (db, h))
-	ctx:move_to (0, y)
-	ctx:line_to (w, y)
-	ctx:stroke ()
-end
-
-function grid_freq (ctx, w, h, f)
-	-- draw vertical grid line
-	local x = -.5 + round (x_at_freq (f, w))
-	ctx:move_to (x, 0)
-	ctx:line_to (x, h)
-	ctx:stroke ()
-end
-
-function render_inline (ctx, w, max_h)
-	if not filt then
-		-- the GUI is separate from the DSP, but the GUI needs to know
-		-- the sample-rate that the DSP is using.
-		local shmem = self:shmem () -- get shared memory region
-		local cfg = shmem:to_int (0):array () -- "cast" into lua-table
-		-- instantiate filter (to calculate the transfer function's response)
-		filt = ARDOUR.DSP.Biquad (cfg[1])
-	end
-
-	-- set filter coefficients if they have changed
-	if param_changed (CtrlPorts:array ()) then
-		local ctrl = CtrlPorts:array ()
-		for k = 1,4 do cur[k] = ctrl[k] end
-		if cur[2] < 1 then cur[2] = 1 end
-		if cur[2] > 4 then cur[2] = 4 end
-		filt:compute (map_type (cur[1]), cur[3], cur[4], 0)
-	end
-
-	-- calc height of inline display
-	local h = 1 | math.ceil (w * 9 / 16) -- use 16:9 aspect, odd number of y pixels
-	if (h > max_h) then h = max_h end -- but at most max-height
-
-	-- ctx is a http://cairographics.org/ context
-	-- http://manual.ardour.org/lua-scripting/class_reference/#Cairo:Context
-
-	-- clear background
-	ctx:rectangle (0, 0, w, h)
-	ctx:set_source_rgba (.2, .2, .2, 1.0)
-	ctx:fill ()
-	ctx:rectangle (0, 0, w, h)
-	ctx:clip ();
-
-	-- set line width: 1px
-	-- Note: a cairo pixel at [1,1]  spans [0.5->1.5 , 0.5->1.5]
-	-- hence the offset -0.5 in various move_to(), line_to() calls
-	ctx:set_line_width (1.0)
-
-	-- draw grid
-	local dash3 = C.DoubleVector ()
-	local dash2 = C.DoubleVector ()
-	dash2:add ({1, 2})
-	dash3:add ({1, 3})
-	ctx:set_dash (dash2, 2) -- dotted line
-	ctx:set_source_rgba (.5, .5, .5, .8)
-	grid_db (ctx, w, h, 0)
-	ctx:set_dash (dash3, 2) -- dotted line
-	ctx:set_source_rgba (.5, .5, .5, .5)
-	grid_db (ctx, w, h, -12)
-	grid_db (ctx, w, h, -24)
-	grid_db (ctx, w, h, -36)
-	grid_freq (ctx, w, h, 100)
-	grid_freq (ctx, w, h, 1000)
-	grid_freq (ctx, w, h, 10000)
-	ctx:unset_dash ()
-
-	local o = math.floor(cur[2])
-	-- draw transfer function line
-	ctx:set_source_rgba (.8, .8, .8, 1.0)
-	ctx:move_to (-.5, db_to_y (o * filt:dB_at_freq (freq_at_x (0, w)), h))
-	for x = 1,w do
-		local db = o * filt:dB_at_freq (freq_at_x (x, w))
-		ctx:line_to (-.5 + x, db_to_y (db, h))
-	end
-	ctx:stroke_preserve ()
-
-	-- fill area to zero under the curve
-	ctx:line_to (w, -.5 + round (db_to_y (0, h)))
-	ctx:line_to (0, -.5 + round (db_to_y (0, h)))
-	ctx:close_path ()
-	ctx:set_source_rgba (.5, .5, .5, .5)
-	ctx:fill ()
-
-	return {w, h}
-end