ardour/livetrax
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clean up Hp/Lp code

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This commit is contained in:
Robin Gareus 2016-07-18 10:53:40 +02:00
parent 05ec8c46a7
commit 7e1a722a15
1 changed files with 7 additions and 9 deletions
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16
scripts/HiAndLowPass.lua
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@ -4,7 +4,7 @@ ardour {
category = "Filter",
license = "GPLv2",
author = "Ardour Team",
description = [[Example Ardour Lua DSP Plugin]]
description = [[High Low Pass filter with up to 48dB / octave]]
}
function dsp_ioconfig ()
@ -49,7 +49,7 @@ end
local hp = {} -- the biquad high-pass filter instances (DSP)
local lp = {} -- the biquad high-pass filter instances (DSP)
local filt = nil -- the biquad filter instance (GUI, response)
local cur = {0, 0, 0, 0, 0, 0, 0} -- current parameters
local cur = {0, 0, 0, 0, 0, 0} -- current parameters
local lpf = 0.03 -- parameter low-pass filter time-constant
local chn = 0 -- channel/filter count
@ -64,7 +64,7 @@ function dsp_init (rate)
tbl['samplerate'] = rate
self:table ():set (tbl)
-- interpolation time constant, 64fpp
-- interpolation time constant, ~15Hz @ 64fpp
lpf = 5000 / rate
end
@ -161,7 +161,6 @@ function dsp_run (ins, outs, n_samples)
for c = 1, #ins do
local xfade = cur[1] - ho
assert (xfade >= 0 and xfade < 1)
ARDOUR.DSP.copy_vector (mem:to_float (off), ins[c]:offset (off), siz)
@ -192,19 +191,18 @@ function dsp_run (ins, outs, n_samples)
-- low pass
xfade = cur[4] - lo
assert (xfade >= 0 and xfade < 1)
-- copy output of high-pass into "processing memory"
ARDOUR.DSP.copy_vector (mem:to_float (off), outs[c]:offset (off), siz)
if cur[4] > 0 then
-- clear output, Low-pass mixes interpolated data into output,
-- in which case we just keep the output
-- Clear output, Low-pass mixes interpolated data into output.
-- (Except if the filter is disabled (0) in which case we just keep the output.)
ARDOUR.DSP.memset (outs[c]:offset (off), 0, siz)
end
for k = 1,4 do
if xfade > 0 and k > lo and k <= lo + 1 then
if xfade > 0 and k == lo + 1 then
ARDOUR.DSP.mix_buffers_with_gain (outs[c]:offset (off), mem:to_float (off), siz, 1 - xfade)
end
@ -212,7 +210,7 @@ function dsp_run (ins, outs, n_samples)
if k == lo and xfade == 0 then
ARDOUR.DSP.copy_vector (outs[c]:offset (off), mem:to_float (off), siz)
elseif k > lo and k <= lo + 1 then
elseif k == lo + 1 then
ARDOUR.DSP.mix_buffers_with_gain (outs[c]:offset (off), mem:to_float (off), siz, xfade)
end
end