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| #### RemiAudio
#### Copyright (C) 2022-2024 Remilia Scarlet <remilia@posteo.jp>
#### Based on Zita-Rev1
#### Copyright (C) 2003-2017 Fons Adriaensen <fons@linuxaudio.org>
####
#### This program is free software; you can redistribute it and/or modify it
#### under the terms of the GNU General Public License as published by the Free
#### Software Foundation; either version 3 of the License, or (at your option)
#### any later version.
####
#### This program is distributed in the hope that it will be useful, but WITHOUT
#### ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
#### FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
#### more details.
####
#### You should have received a copy of the GNU General Public License along
#### with this program. If not, see <http://www.gnu.org/licenses/>.
require "./reverb"
module RemiAudio::DSP
class ZitaReverb < Reverb
# A parametric equalizer specifically for `ZitaReverb` and
# `ZitaReverbSimple`.
private class ParametricEQ
enum Mode
Bypass = 1
Static
Smooth
MaxCh
end
@touch0 : Int16 = 0
@touch1 : Int16 = 0
@state : Mode = Mode::Bypass
@bypass : Bool = false
@sampleRate : Float64 = 0.0
@invSampleRate : Float64 = 0.0
getter g0 : Float64 = 1.0
getter g1 : Float64 = 1.0
getter f0 : Float64 = 1.0e3
getter f1 : Float64 = 1.0e3
@c1 : Float64 = 0.0
@dc1 : Float64 = 0.0
@c2 : Float64 = 0.0
@dc2 : Float64 = 0.0
@gg : Float64 = 0.0
@dgg : Float64 = 0.0
@z1 : Array(Float64) = Array.new(PARA_EQ_MAX_CH, 0.0f64)
@z2 : Array(Float64) = Array.new(PARA_EQ_MAX_CH, 0.0f64)
def initialize
self.sampleRate = 44100.0
end
@[AlwaysInline]
def sampleRate=(@sampleRate : Float64) : Nil
@invSampleRate = 1.0 / @sampleRate
reset
end
@[AlwaysInline]
def setParam(freq : Float64, gain : Float64) : Nil
@f0 = freq
@g0 = 10.0f64 ** (0.05 * gain)
@touch0 += 1
end
@[AlwaysInline]
def reset : Nil
@z1.fill(0.0f64)
@z2.fill(0.0f64)
end
def prepare(numFrames : Int) : Nil
update : Bool = false
g : Float64 = 0.0
f : Float64 = 0.0
unless @touch0 == @touch1
g = @g0
f = @f0
unless g == @g1
update = true
if g > (@g1 + @g1)
@g1 *= 2.0
elsif @g1 > (g + g)
@g1 *= 0.5
else
@g1 = g
end
end
unless f == @f1
update = true
if f > (@f1 + @f1)
@f1 *= 2.0
elsif @f1 > (f + f)
@f1 *= 0.5
else
@f1 = f
end
end
if update
if @state.bypass? && @g1 == 1.0
calculate(0, @g1, @f1)
else
@state = Mode::Smooth
calculate(numFrames, @g1, @f1)
end
else
@touch1 = @touch0
if (@g1 - 1).abs < 0.001
@state = Mode::Bypass
reset
else
@state = Mode::Static
end
end
end
end
@[AlwaysInline]
def calculate(numFrames : Int, gain : Float64, freq : Float64) : Nil
freq = freq * Math::PI * @invSampleRate
b : Float64 = (2 * freq) / Math.sqrt(gain)
gg : Float64 = 0.5 * (gain - 1.0)
c1 : Float64 = -RemiMath.fastCos(2 * freq)
c2 : Float64 = (1 - b) / (1 + b)
if numFrames > 0
@dc1 = (c1 - @c1) / numFrames + 1.0e-30f64
@dc2 = (c2 - @c2) / numFrames + 1.0e-30f64
@dgg = (gg - @gg) / numFrames + 1.0e-30f64
else
@c1 = c1
@c2 = c2
@gg = gg
end
end
private macro defineProcessFuncs(numType, fromDataFn, toDataFn)
{% if (toDataFn && !fromDataFn) || (!toDataFn && fromDataFn) %}
{% raise "fromDataFn and toDataFn must both be specified, or neither" %}
{% end %}
private def processSmooth(dataLeft : Array({{numType}})|Slice({{numType}}),
dataRight : Array({{numType}})|Slice({{numType}})) : Nil
c1 : Float64 = 0.0
c2 : Float64 = 0.0
gg : Float64 = 0.0
z1 : Float64 = 0.0
z2 : Float64 = 0.0
x : Float64 = 0.0
y : Float64 = 0.0
# Left...
z1 = @z1.unsafe_fetch(0)
z2 = @z2.unsafe_fetch(0)
c1 = @c1
c2 = @c2
gg = @gg
dataLeft.size.times do |j|
c1 += @dc1
c2 += @dc2
gg += @dgg
{% if fromDataFn %}
x = dataLeft.unsafe_fetch(j).{{fromDataFn.id}}
{% else %}
x = dataLeft.unsafe_fetch(j)
{% end %}
y = x - (c2 * z2)
{% if toDataFn %}
dataLeft.unsafe_put(j, (x - gg * (z2 + c2 * y - x)).{{toDataFn.id}})
{% else %}
dataLeft.unsafe_put(j, x - gg * (z2 + c2 * y - x))
{% end %}
y -= c1 * z1
z2 = z1 + c1 * y
z1 = y + 1.0e-20f64
end
@z1.unsafe_put(0, z1)
@z2.unsafe_put(0, z2)
# Right...
z1 = @z1.unsafe_fetch(1)
z2 = @z2.unsafe_fetch(1)
c1 = @c1
c2 = @c2
gg = @gg
dataRight.size.times do |j|
c1 += @dc1
c2 += @dc2
gg += @dgg
{% if fromDataFn %}
x = dataRight.unsafe_fetch(j).{{fromDataFn.id}}
{% else %}
x = dataRight.unsafe_fetch(j)
{% end %}
x = dataRight[j]
y = x - c2 * z2
{% if toDataFn %}
dataRight.unsafe_put(j, (x - gg * (z2 + c2 * y - x)).{{toDataFn.id}})
{% else %}
dataRight.unsafe_put(j, x - gg * (z2 + c2 * y - x))
{% end %}
y -= c1 * z1
z2 = z1 + c1 * y
z1 = y + 1.0e-20f64
end
@z1.unsafe_put(1, z1)
@z2.unsafe_put(1, z2)
# Finish up
@c1 = c1
@c2 = c2
@gg = gg
end
private def processNonSmooth(dataLeft : Array({{numType}})|Slice({{numType}}),
dataRight : Array({{numType}})|Slice({{numType}})) : Nil
c1 : Float64 = 0.0
c2 : Float64 = 0.0
gg : Float64 = 0.0
z1 : Float64 = 0.0
z2 : Float64 = 0.0
x : Float64 = 0.0
y : Float64 = 0.0
# Left...
z1 = @z1.unsafe_fetch(0)
z2 = @z2.unsafe_fetch(0)
dataLeft.size.times do |j|
{% if fromDataFn %}
x = dataLeft.unsafe_fetch(j).{{fromDataFn.id}}
{% else %}
x = dataLeft.unsafe_fetch(j)
{% end %}
y = x - (c2 * z2)
{% if toDataFn %}
dataLeft.unsafe_put(j, (x - gg * (z2 + c2 * y - x)).{{toDataFn.id}})
{% else %}
dataLeft.unsafe_put(j, x - gg * (z2 + c2 * y - x))
{% end %}
y -= c1 * z1
z2 = z1 + (c1 * y)
z1 = y + 1.0e-20f64
end
@z1.unsafe_put(0, z1)
@z2.unsafe_put(0, z2)
# Right...
z1 = @z1.unsafe_fetch(1)
z2 = @z2.unsafe_fetch(1)
dataRight.size.times do |j|
{% if fromDataFn %}
x = dataRight.unsafe_fetch(j).{{fromDataFn.id}}
{% else %}
x = dataRight.unsafe_fetch(j)
{% end %}
y = x - (c2 * z2)
{% if toDataFn %}
dataRight.unsafe_put(j, (x - gg * (z2 + c2 * y - x)).{{toDataFn.id}})
{% else %}
dataRight.unsafe_put(j, x - gg * (z2 + c2 * y - x))
{% end %}
y -= (c1 * z1)
z2 = z1 + (c1 * y)
z1 = y + 1.0e-20f64
end
@z1.unsafe_put(1, z1)
@z2.unsafe_put(1, z2)
end
# Interleaved version
private def processSmooth(data : Array({{numType}})|Slice({{numType}})) : Nil
c1 : Float64 = 0.0
c2 : Float64 = 0.0
gg : Float64 = 0.0
z1 : Float64 = 0.0
z2 : Float64 = 0.0
x : Float64 = 0.0
y : Float64 = 0.0
j = 0
# Left...
z1 = @z1.unsafe_fetch(0)
z2 = @z2.unsafe_fetch(0)
c1 = @c1
c2 = @c2
gg = @gg
while j < data.size
c1 += @dc1
c2 += @dc2
gg += @dgg
{% if fromDataFn %}
x = data.unsafe_fetch(j).{{fromDataFn.id}}
{% else %}
x = data.unsafe_fetch(j)
{% end %}
y = x - (c2 * z2)
{% if toDataFn %}
data.unsafe_put(j, (x - gg * (z2 + c2 * y - x)).{{toDataFn.id}})
{% else %}
data.unsafe_put(j, x - gg * (z2 + c2 * y - x))
{% end %}
y -= c1 * z1
z2 = z1 + c1 * y
z1 = y + 1.0e-20f64
j += 2
end
@z1.unsafe_put(0, z1)
@z2.unsafe_put(0, z2)
# Right...
z1 = @z1.unsafe_fetch(1)
z2 = @z2.unsafe_fetch(1)
c1 = @c1
c2 = @c2
gg = @gg
j = 1
while j < data.size
c1 += @dc1
c2 += @dc2
gg += @dgg
{% if fromDataFn %}
x = data.unsafe_fetch(j).{{fromDataFn.id}}
{% else %}
x = data.unsafe_fetch(j)
{% end %}
y = x - c2 * z2
{% if toDataFn %}
data.unsafe_put(j, (x - gg * (z2 + c2 * y - x)).{{toDataFn.id}})
{% else %}
data.unsafe_put(j, x - gg * (z2 + c2 * y - x))
{% end %}
y -= c1 * z1
z2 = z1 + c1 * y
z1 = y + 1.0e-20f64
j += 2
end
@z1.unsafe_put(1, z1)
@z2.unsafe_put(1, z2)
# Finish up
@c1 = c1
@c2 = c2
@gg = gg
end
# Interleaved version
private def processNonSmooth(data : Array({{numType}})|Slice({{numType}})) : Nil
c1 : Float64 = 0.0
c2 : Float64 = 0.0
gg : Float64 = 0.0
z1 : Float64 = 0.0
z2 : Float64 = 0.0
x : Float64 = 0.0
y : Float64 = 0.0
j = 0
# Left...
z1 = @z1.unsafe_fetch(0)
z2 = @z2.unsafe_fetch(0)
while j < data.size
{% if fromDataFn %}
x = data.unsafe_fetch(j).{{fromDataFn.id}}
{% else %}
x = data.unsafe_fetch(j)
{% end %}
y = x - (c2 * z2)
{% if toDataFn %}
data.unsafe_put(j, (x - gg * (z2 + c2 * y - x)).{{toDataFn.id}})
{% else %}
data.unsafe_put(j, x - gg * (z2 + c2 * y - x))
{% end %}
y -= c1 * z1
z2 = z1 + (c1 * y)
z1 = y + 1.0e-20f64
j += 2
end
@z1.unsafe_put(0, z1)
@z2.unsafe_put(0, z2)
# Right...
z1 = @z1.unsafe_fetch(1)
z2 = @z2.unsafe_fetch(1)
j = 1
while j < data.size
{% if fromDataFn %}
x = data.unsafe_fetch(j).{{fromDataFn.id}}
{% else %}
x = data.unsafe_fetch(j)
{% end %}
y = x - (c2 * z2)
{% if toDataFn %}
data.unsafe_put(j, (x - gg * (z2 + c2 * y - x)).{{toDataFn.id}})
{% else %}
data.unsafe_put(j, x - gg * (z2 + c2 * y - x))
{% end %}
y -= (c1 * z1)
z2 = z1 + (c1 * y)
z1 = y + 1.0e-20f64
j += 2
end
@z1.unsafe_put(1, z1)
@z2.unsafe_put(1, z2)
end
end
defineProcessFuncs(Float64, nil, nil)
defineProcessFuncs(Float32, :to_f64!, :to_f32!)
{% begin %}
{% for typ in [:Float64, :Float32] %}
@[AlwaysInline]
def process(dataLeft : Array({{typ.id}})|Slice({{typ.id}}),
dataRight : Array({{typ.id}})|Slice({{typ.id}})) : Nil
if @state.smooth?
processSmooth(dataLeft, dataRight)
else
processNonSmooth(dataLeft, dataRight)
end
end
@[AlwaysInline]
def process(data : Array({{typ.id}})|Slice({{typ.id}})) : Nil
if @state.smooth?
processSmooth(data)
else
processNonSmooth(data)
end
end
@[AlwaysInline]
def process(dataLeft : {{typ.id}}, dataRight : {{typ.id}}) : Tuple({{typ.id}}, {{typ.id}})
left = Slice({{typ.id}}).new(1, dataLeft)
right = Slice({{typ.id}}).new(1, dataRight)
if @state.smooth?
processSmooth(dataLeft, left)
else
processNonSmooth(dataLeft, right)
end
{left.unsafe_fetch(0), right.unsafe_fetch(0)}
end
{% end %}
{% end %}
end
end
end
|