From 65eeeb7a652d7022783b10e35941ce56e0fc7207 Mon Sep 17 00:00:00 2001 From: Robin Gareus Date: Sun, 17 Jul 2016 01:20:45 +0200 Subject: [PATCH] remove old a-Hi/Low pass --- scripts/hplp.lua | 285 ----------------------------------------------- 1 file changed, 285 deletions(-) delete mode 100644 scripts/hplp.lua 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 -- 2.30.2