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# freeverb.rb -- CLM -> Snd/Ruby translation of freeverb.ins
# Translator/Author: Michael Scholz <mi-scholz@users.sourceforge.net>
# Created: 03/04/08 03:53:20
# Changed: 14/11/13 15:47:00
# Original notes of Fernando Lopez-Lezcano
# ;; Freeverb - Free, studio-quality reverb SOURCE CODE in the public domain
# ;;
# ;; Written by Jezar at Dreampoint, June 2000
# ;; http://www.dreampoint.co.uk
# ;;
# ;; Translated into clm-2 by Fernando Lopez-Lezcano <nando@ccrma.stanford.edu>
# ;; Version 1.0 for clm-2 released in January 2001
# ;; http://ccrma.stanford.edu/~nando/clm/freeverb/
# ;;
# ;; Changes to the original code by Jezar (by Fernando Lopez-Lezcano):
# ;; - the clm version can now work with a mono input or an n-channel input
# ;; stream (in the latter case the number of channels of the input and output
# ;; streams must match.
# ;; - the "wet" parameter has been eliminated as it does not apply to the model
# ;; that clm uses to generate reverberation
# ;; - the "width" parameter name has been changed to :global. It now controls
# ;; the coefficients of an NxN matrix that specifies how the output of the
# ;; reverbs is mixed into the output stream.
# ;; - predelays for the input channels have been added.
# ;; - damping can be controlled individually for each channel.
# For more information see clm-x/freeverb.html.
require "ws"
# Snd-Ruby's freeverb and fcomb (see sndins.so for a faster one).
unless provided? :sndins
class Fcomb
def initialize(scaler, size, a0, a1)
@feedback = scaler.to_f
@delay = make_delay(size.to_i)
@filter = make_one_zero(a0, a1)
end
attr_accessor :feedback
def fcomb(input = 0.0)
delay(@delay, input + one_zero(@filter, tap(@delay)) * @feedback)
end
def inspect
format("#<%s: %p, %p, feedback: %0.3f>",
self.class, @delay, @filter, @feedback)
end
end
def make_fcomb(scaler = 0.0, size = 1, a0 = 0.0, a1 = 0.0)
Fcomb.new(scaler, size, a0, a1)
end
def fcomb(gen, input = 0.0)
gen.fcomb(input)
end
def fcomb?(obj)
obj.kind_of?(Fcomb)
end
end
add_help(:freeverb,
"freeverb(*args)
:room_decay, 0.5,
:damping, 0.5,
:global, 0.3,
:predelay, 0.03,
:output_gain, 1.0,
:output_mixer, nil,
:scale_room_decay, 0.28,
:offset_room_decay, 0.7,
:combtuning, [1116, 1188, 1277, 1356, 1422, 1491, 1557, 1617],
:allpasstuning, [556, 441, 341, 225],
:scale_damping, 0.4,
:stereo_spread, 23,
with_sound(:reverb, :freeverb) do fm_violin(0, 1, 440, 0.3) end
This is the Ruby version of freeverb. For a faster one see sndins.so.")
def freeverb(*args)
room_decay, damping, global, predelay, output_gain, output_mixer = nil
scale_room_decay, offset_room_decay, combtuning, allpasstuning = nil
scale_damping, stereo_spread = nil
optkey(args, binding,
[:room_decay, 0.5],
[:damping, 0.5],
[:global, 0.3],
[:predelay, 0.03],
[:output_gain, 1.0],
[:output_mixer, nil],
[:scale_room_decay, 0.28],
[:offset_room_decay, 0.7],
[:combtuning, [1116, 1188, 1277, 1356, 1422, 1491, 1557, 1617]],
[:allpasstuning, [556, 441, 341, 225]],
[:scale_damping, 0.4],
[:stereo_spread, 23])
if @reverb_channels > 1 and @reverb_channels != @channels
error("input must be mono or input channels must equal output channels")
end
out_gain = output_gain
local_gain = (1.0 - global) * (1.0 - 1.0 / @channels) + 1.0 / @channels
global_gain = (@channels - local_gain * @channels) /
[(@channels * @channels - @channels), 1].max
srate_scale = @srate / 44100.0
out_mix = output_mixer
unless vct?(output_mixer)
out_mix = Vct.new(@channels) do
(out_gain * global_gain) / @channels
end
end
predelays = make_array(@reverb_channels) do
make_delay(:size, (@srate * predelay).to_i)
end
room_decay_val = room_decay * scale_room_decay + offset_room_decay
combs = make_array(@channels) do |c|
combtuning.map do |tuning|
dmp = scale_damping * damping
sz = (srate_scale * tuning).to_i
if c.odd?
sz += (srate_scale * stereo_spread).to_i
end
make_fcomb(room_decay_val, sz, 1.0 - dmp, dmp)
end
end
allpasses = make_array(@channels) do |c|
allpasstuning.map do |tuning|
sz = (srate_scale * tuning).to_i
if c.odd?
sz += (srate_scale * stereo_spread).to_i
end
make_all_pass(:size, sz, :feedforward, -1.0, :feedback, 0.5)
end
end
len = @ws_reverb.length + seconds2samples(@decay_time)
name = get_func_name()
# to satisfy with_sound-option :info and :notehook
with_sound_info(name, 0, samples2seconds(len))
if @verbose
Snd.message("%s on %d in and %d out channels",
name, @reverb_channels, @channels)
end
f_in = Vct.new(@reverb_channels, 0.0)
f_out = Vct.new(@channels, 0.0)
out_buf = Vct.new(@channels, 0.0)
if @reverb_channels == 1
len.times do |i|
fin = delay(predelays[0], file2sample(@ws_reverb, i, 0))
combs.each_with_index do |fcbs, c|
f_out[c] = 0.0
fcbs.each do |fcb|
f_out[c] += fcomb(fcb, fin)
end
end
allpasses.each_with_index do |apss, c|
apss.each do |aps|
f_out[c] = all_pass(aps, f_out[c])
end
end
frample2file(@ws_output, i,
frample2frample(out_mix, f_out, @channels,
out_buf, @channels))
end
else
len.times do |i|
fin = file2frample(@ws_reverb, i, f_in).map_with_index do |f, c|
delay(predelays[c], f)
end
combs.each_with_index do |fcbs, c|
f_out[c] = 0.0
fcbs.each do |fcb|
f_out[c] += fcomb(fcb, fin[c])
end
end
allpasses.each_with_index do |apss, c|
apss.each do |aps|
f_out[c] = all_pass(aps, f_out[c])
end
end
frample2file(@ws_output, i,
frample2frample(out_mix, f_out, @channels,
out_buf, @channels))
end
end
end
=begin
with_sound(:reverb, :freeverb,
:reverb_data, [:room_decay, 0.9],
:channels, 2,
:reverb_channels, 1,
:output, "fvrb-test.snd",
:play, 1,
:statistics, true) do
fm_violin(0, 1, 440, 0.5)
end
with_sound(:statistics, true,
:reverb, :freeverb,
:reverb_data, [:output_gain, 3.0]) do
outa(0, 0.5, @ws_reverb)
end
with_sound(:channels, 2,
:reverb_channels, 2,
:statistics, true,
:reverb, :freeverb,
:reverb_data, [:output_gain, 3.0]) do
outa(0, 0.5, @ws_reverb)
outb(0, 0.1, @ws_reverb)
end
=end
# freeverb.rb ends here
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