ardour/livetrax
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update lua-biquad: add en/disable

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This commit is contained in:
Robin Gareus 2016-07-07 16:45:10 +02:00
parent 266ecfbeec
commit 53b51ee536
1 changed files with 24 additions and 14 deletions
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38
scripts/filt.lua
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@ -21,6 +21,7 @@ end
function dsp_params ()
return
{
{ ["type"] = "input", name = "Enable", min = 0, max = 1, default = 1, bypass = true, toggled = true },
{ ["type"] = "input", name = "Type", min = 0, max = 4, default = 0, enum = true, scalepoints =
{
["Peaking"] = 0,
@ -52,10 +53,18 @@ function map_type (t)
end
end
function ctrl_data ()
local ctrl = CtrlPorts:array ()
if ctrl[1] <= 0 then -- when disabled
ctrl[3] = 0; -- force gain to 0dB
end
return ctrl
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 cur = {0, 0, 0, 0, 0} -- current parameters
local lpf = 0.03 -- parameter low-pass filter time-constant
local chn = 0 -- channel/filter count
@ -76,12 +85,12 @@ function dsp_configure (ins, outs)
for c = 1, chn do
filters[c] = ARDOUR.DSP.Biquad (rate) -- initialize filters
end
cur = {0, 0, 0, 0}
cur = {0, 0, 0, 0, 0}
end
-- helper functions for parameter interpolation
function param_changed (ctrl)
if ctrl[1] == cur[1] and ctrl[2] == cur[2] and ctrl[3] == cur[3] and ctrl[4] == cur[4] then
if ctrl[2] == cur[2] and ctrl[3] == cur[3] and ctrl[4] == cur[4] and ctrl[5] == cur[5] then
return false
end
return true
@ -101,19 +110,19 @@ function apply_params (ctrl)
return
end
if cur[1] ~= ctrl[1] then
if cur[2] ~= ctrl[2] then
-- reset filter state when type changes
filt:reset ()
for k = 1,4 do cur[k] = ctrl[k] end
for k = 2,5 do cur[k] = ctrl[k] end
else
-- low-pass filter ctrl parameter values, smooth transition
cur[2] = low_pass_filter_param (cur[2], ctrl[2], 0.1) -- gain/dB
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
cur[3] = low_pass_filter_param (cur[3], ctrl[3], 0.1) -- gain/dB
cur[4] = low_pass_filter_param (cur[4], ctrl[4], 1.0) -- freq/Hz
cur[5] = low_pass_filter_param (cur[5], ctrl[5], 0.01) -- quality
end
for c = 1, chn do
filters[c]:compute (map_type (cur[1]), cur[3], cur[4], cur[2])
filters[c]:compute (map_type (cur[2]), cur[4], cur[5], cur[3])
end
end
@ -123,17 +132,18 @@ function dsp_run (ins, outs, n_samples)
local changed = false
local siz = n_samples
local off = 0
local ctrl = ctrl_data ()
-- 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
if param_changed (ctrl) then
changed = true
siz = 64
end
while n_samples > 0 do
if changed then apply_params (CtrlPorts:array ()) end
if changed then apply_params (ctrl) end
if siz > n_samples then siz = n_samples end
-- process all channels
@ -212,9 +222,9 @@ function render_inline (ctx, w, max_h)
-- 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
filt:compute (map_type (cur[1]), cur[3], cur[4], cur[2])
local ctrl = ctrl_data ()
for k = 2,5 do cur[k] = ctrl[k] end
filt:compute (map_type (cur[2]), cur[4], cur[5], cur[3])
end
-- calc height of inline display