1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
| #### 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 "math"
require "../../common"
require "./zita"
module RemiAudio::DSP
# Implements a Hall-like reverb effect.
#
# This is a port of Zita-Rev1, a mostly-a-hall-partially-a-plate reverb based
# on a feedback delay network and allpass comb filters.
#
# The original Zita-Rev1 supports an "ambisonic" mode, which allows for two
# inputs and four outputs. This implementation does not support the
# calculations for ambisonic mode, however, so it's strictly a reverb with
# stereo output.
#
# This particular variation is simplified to save on CPU time.
class ZitaReverbSimple < ZitaReverb
def initialize(newSampleRate : Int32, numFrames : Int32)
@sampleRate = newSampleRate.to_f64
@invSampleRate = 1.0f64 / @sampleRate
# Create pre-delays
@vdelay0 = VDelay.new((0.1f64 * @sampleRate).to_i32!)
@vdelay1 = VDelay.new((0.1f64 * @sampleRate).to_i32!)
# Create main delay network
@diff1 = [] of Diff
@delay = [] of Delay
NUM_DIFFS.times do |i|
k1 = (TDIFF[i] * @sampleRate + 0.5).floor.to_i64!
k2 = (TDELAY[i] * @sampleRate + 0.5).floor.to_i64!
@diff1 << Diff.new(k1, ((i & 1) != 0 ? -0.6f64 : 0.6f64))
@delay << Delay.new(k2 - k1)
end
# Prepare internal values
prepare(numFrames)
end
private def prepare(numFrames : Int32) : Nil
a : Int32 = @cntA1
b : Int32 = @cntB1
c : Int32 = @cntC1
@d0 = 0.0
@d1 = 0.0
k : Int32 = (((@ipdel - 0.02) * @sampleRate) + 0.5).trunc.to_i32!
@vdelay0.setDelay(k)
@vdelay1.setDelay(k)
@cntA2 = a
wlo : Float64 = 6.2832 * @xover * @invSampleRate
chi : Float64 = if @damping > (0.49 * @sampleRate)
2.0
else
1 - RemiMath.fastCos(6.2832 * @damping * @invSampleRate)
end
halfRtMid : Float64 = 0.5 * @rtmid
8.times do |i|
@filt1.unsafe_fetch(i).setParams(TDELAY.unsafe_fetch(i), @rtmid, @rtlow, wlo, halfRtMid, chi)
end
@cntB2 = b
t1 : Float64 = 0.7 / Math.sqrt(@rtmid)
@d0 = (-@g0) / numFrames
@d1 = (t1 - @g1) / numFrames
@cntC2 = c
end
def damping : Float64
raise "Not supported by this class"
end
def damping=(value : Float64)
raise "Not supported by this class"
end
def predelay : Float64
raise "Not supported by this class"
end
def predelay=(value : Float64)
raise "Not supported by this class"
end
def crossover : Float64
raise "Not supported by this class"
end
def crossover=(value : Float64)
raise "Not supported by this class"
end
def timeLow : Float64
raise "Not supported by this class"
end
def timeLow=(value : Float64)
raise "Not supported by this class"
end
def timeHigh : Float64
raise "Not supported by this class"
end
def timeHigh=(value : Float64)
raise "Not supported by this class"
end
def eq(number : Int) : Tuple(Float64, Float64)
raise "Not supported by this class"
end
def setEq(number : Int, frequency : Float64, gain : Float64)
raise "Not supported by this class"
end
def mute
@vdelay0.mute
@vdelay1.mute
@diff1.each &.mute
@delay.each &.mute
@filt1.each &.reset
end
macro processZ(z, x0, x1)
{{z}} = {{x0}} - {{x1}}
{{x0}} += {{x1}}
{{x1}} = {{z}}
end
# Purposely unhygenic. Sets up variables for use in the process() methods.
private macro processCommon
z : Float64 = 0.0
x0 : Float64 = 0.0
x1 : Float64 = 0.0
x2 : Float64 = 0.0
x3 : Float64 = 0.0
x4 : Float64 = 0.0
x5 : Float64 = 0.0
x6 : Float64 = 0.0
x7 : Float64 = 0.0
end
private macro processLeftRight(left, right, outLeft, outRight)
# Write to the pre-delays
@vdelay0.write({{left}})
@vdelay1.write({{right}})
# Pre-Delay -> Diffuser
z = 0.375f64 * @vdelay0.read # Remi: This was 0.3 in the original Zita-Rev1 code
x0 = @diff1.unsafe_fetch(0).process(@delay.unsafe_fetch(0).read + z)
x1 = @diff1.unsafe_fetch(1).process(@delay.unsafe_fetch(1).read + z)
x2 = @diff1.unsafe_fetch(2).process(@delay.unsafe_fetch(2).read - z)
x3 = @diff1.unsafe_fetch(3).process(@delay.unsafe_fetch(3).read - z)
z = 0.375f64 * @vdelay1.read # Remi: This was 0.3 in the original Zita-Rev1 code
x4 = @diff1.unsafe_fetch(4).process(@delay.unsafe_fetch(4).read + z)
x5 = @diff1.unsafe_fetch(5).process(@delay.unsafe_fetch(5).read + z)
x6 = @diff1.unsafe_fetch(6).process(@delay.unsafe_fetch(6).read - z)
x7 = @diff1.unsafe_fetch(7).process(@delay.unsafe_fetch(7).read - z)
# Send signals through delay lines
processZ(z, x0, x1)
processZ(z, x2, x3)
processZ(z, x4, x5)
processZ(z, x6, x7)
processZ(z, x0, x2)
processZ(z, x1, x3)
processZ(z, x4, x6)
processZ(z, x5, x7)
processZ(z, x0, x4)
processZ(z, x1, x5)
processZ(z, x2, x6)
processZ(z, x3, x7)
# Mix
@g1 += @d1
{{outLeft}} = @g1 * (x1 + x2)
{{outRight}} = @g1 * (x1 - x2)
# Update FDN
@delay.unsafe_fetch(0).write(@filt1.unsafe_fetch(0).process(ZITA_G * x0))
@delay.unsafe_fetch(1).write(@filt1.unsafe_fetch(1).process(ZITA_G * x1))
@delay.unsafe_fetch(2).write(@filt1.unsafe_fetch(2).process(ZITA_G * x2))
@delay.unsafe_fetch(3).write(@filt1.unsafe_fetch(3).process(ZITA_G * x3))
@delay.unsafe_fetch(4).write(@filt1.unsafe_fetch(4).process(ZITA_G * x4))
@delay.unsafe_fetch(5).write(@filt1.unsafe_fetch(5).process(ZITA_G * x5))
@delay.unsafe_fetch(6).write(@filt1.unsafe_fetch(6).process(ZITA_G * x6))
@delay.unsafe_fetch(7).write(@filt1.unsafe_fetch(7).process(ZITA_G * x7))
end
def process(inputLeft : Array(Float64)|Slice(Float64), inputRight : Array(Float64)|Slice(Float64),
outputLeft : Array(Float64)|Slice(Float64), outputRight : Array(Float64)|Slice(Float64)) : Nil
unless inputLeft.size == outputLeft.size &&
inputRight.size == outputRight.size &&
inputLeft.size == inputRight.size
raise BufferSizeMismatchError.new("The length of the buffers must match")
end
prepare(inputLeft.size)
processCommon
inputLeft.size.times do |i|
processLeftRight(inputLeft[i], inputRight[i], outputLeft[i], outputRight[i])
end
end
def process(inputLeft : Array(Float32)|Slice(Float32), inputRight : Array(Float32)|Slice(Float32),
outputLeft : Array(Float32)|Slice(Float32), outputRight : Array(Float32)|Slice(Float32)) : Nil
unless inputLeft.size == outputLeft.size &&
inputRight.size == outputRight.size &&
inputLeft.size == inputRight.size
raise BufferSizeMismatchError.new("The length of the buffers must match")
end
prepare(inputLeft.size)
processCommon
outLeft : Float64 = 0.0
outRight : Float64 = 0.0
inputLeft.size.times do |i|
processLeftRight(inputLeft[i], inputRight[i], outLeft, outRight)
outputLeft[i] = outLeft.to_f32!
outputRight[i] = outRight.to_f32!
end
end
def process(input : Array(Float32)|Slice(Float32), output : Array(Float32)|Slice(Float32)) : Nil
unless input.size == output.size
raise BufferSizeMismatchError.new("The length of the buffers must match")
end
prepare(input.size.tdiv(2))
processCommon
outLeft : Float64 = 0.0
outRight : Float64 = 0.0
i = 0
while i < input.size
processLeftRight(input[i].to_f64!, input[i + 1].to_f64!, outLeft, outRight)
output[i] = (outLeft * amount).to_f32!
output[i + 1] = (outRight * amount).to_f32!
i += 2
end
end
def process(buffer : Array(Float32)|Slice(Float32), amount : Float32|Float64 = 1.0) : Nil
prepare(buffer.size.tdiv(2))
processCommon
outLeft : Float64 = 0.0
outRight : Float64 = 0.0
i = 0
while i < buffer.size
processLeftRight(buffer[i].to_f64!, buffer[i + 1].to_f64!, outLeft, outRight)
buffer[i] += (outLeft * amount).to_f32!
buffer[i + 1] += (outRight * amount).to_f32!
i += 2
end
end
def updateInternalParams(*, numFrames : Int32 = 0)
prepare(numFrames)
end
end
end
|