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# bess1.rb -- examples from clm-2/rt.lisp and clm-2/bess5.cl
# Translator: Michael Scholz <mi-scholz@users.sourceforge.net>
# Created: 2002/09/15 19:11:12
# Changed: 2018/01/11 20:05:09
#
# snd-ruby-xm -batch bess1.rb -e agn
# or
# snd-ruby-xm bess1.rb
require "snd-xm"
require "v"
require "env"
class FM_Forever2
FM2name = "FM Forever!"
FM2info = "\
bess1.rb provides mono real time output to DAC.
Frequency, amplitude, FM index, and tempo
can be controlled via slider."
def initialize
@tempo = 0.1
@freq = 1.0
@amp = 1.0
@index = 1.0
@low_tempo = 0.05
@high_tempo = 0.5
@low_freq = 0.1
@high_freq = 4.0
@high_index = 2.0
end
def start_dac(&body)
set_playing(false)
freq = @freq
amp = @amp
tempo = @tempo
index = @index
s1, s2, s3, s4 = false
reset_cb = lambda do |w, c, i|
set_scale_value(s1.scale, @freq = freq, 100.0)
set_scale_value(s2.scale, @amp = amp, 100.0)
set_scale_value(s3.scale, @tempo = tempo, 100.0)
set_scale_value(s4.scale, @index = index, 100.0)
end
help_cb = lambda do |w, c, i| info_dialog(FM2name, FM2info) end
#
# -batch sets XtSetMappedWhenManaged(shell, 0)
# The "Quit Snd" button is only realized if -batch was given.
#
if get_xtvalue(main_widgets[Top_level_shell], RXmNmappedWhenManaged)
clear_cb = false
else
clear_cb = lambda do |w, c, i| exit(0) end
end
d = make_dialog(FM2name,
:reset_cb, reset_cb,
:clear_cb, clear_cb,
:help_cb, help_cb) do |w, c, i|
if set_playing(!playing)
play(body)
d.doit_string("Pause")
else
d.doit_string("Play")
end
end
name = "carrier freqency"
s1 = d.add_slider(name, @low_freq, freq, @high_freq, 100) do |w, c, i|
@freq = get_scale_value(w, i, 100.0)
end
name = "amplitude"
s2 = d.add_slider(name, 0, amp, 1, 100) do |w, c, i|
@amp = get_scale_value(w, i, 100.0)
end
name = "tempo"
s3 = d.add_slider(name, @low_tempo, tempo, @high_tempo, 100) do |w, c, i|
@tempo = get_scale_value(w, i, 100.0)
end
name = "fm index"
s4 = d.add_slider(name, 0, index, @high_index, 100) do |w, c, i|
@index = get_scale_value(w, i, 100.0)
end
if clear_cb
d.clear_string("Quit Snd")
end
d.doit_string("Play")
set_sensitive(d.okay_button, true)
RXtManageChild(d.dialog)
end
# see clm-2/bess5.cl
def make_agn
lim = 256
mode = [0, 0, 2, 4, 11, 11, 5, 6, 7, 9, 2, 0, 0]
@octs = Array.new(lim + 1) do |i|
4 + 2 * rbell(rbm_random(1.0)).floor
end
@pits = Array.new(lim + 1) do |i|
mode[(12.0 * rbm_random(1.0)).floor]
end
@rhys = Array.new(lim + 1) do |i|
4 + 6 * rbm_random(1.0).floor
end
@begs = Array.new(lim + 1) do |i|
if rbm_random(1.0) < 0.9
4 + 2 * rbm_random(1.0).floor
else
6 * rbm_random(4.0).floor
end
end
@amps = Array.new(lim + 1) do |i|
1 + 8 * rbell(rbm_random(1.0)).floor
end
@cellctr = 0
@cellsiz = 1
@cellbeg = 0
@whichway = 1
@beg = 0.0
@len = 0
@v = lambda do |y| 0.0 end
end
def agn
if @len > 1
@len -= 1
else
bg = @beg
@beg += [0.025, @tempo * (0.95 + rbm_random(0.1)) * @begs[@cellctr]].max
dur = [0.025, @tempo * (0.85 + rbm_random(0.1)) * @rhys[@cellctr]].max
freq = @freq * 16.351 * tune(@pits[@cellctr]) * 2.0 ** @octs[@cellctr]
amp = @amp * [0.003, @amps[@cellctr] * 0.01].max
ind = @index * rbm_random(1.0) * 3.0
@len = seconds2samples(dur)
@v = make_fm_violin(bg, dur, freq, amp, :fm_index, ind)
@cellctr += 1
if @cellctr > (@cellsiz + @cellbeg)
@cellbeg += 1
if rbm_random(1.0) > 0.5
@cellsiz += @whichway
end
if @cellsiz > 10 and rbm_random(1.0) > 0.99
@whichway = -2
elsif @cellsiz > 6 and rbm_random(1.0) > 0.999
@whichway = -1
elsif @cellsiz < 4
@whichway = 1
end
@beg += rbm_random(1.0)
@cellctr = @cellbeg
end
end
@v.call(0)
end
private
def rbm_random(r)
mus_random(r).abs
end
def tune(r)
[1.0, 256.0 / 243, 9.0 / 8, 32.0 / 27, 81.0 / 64,
4.0 / 3, 1024.0 / 729, 3.0 / 2, 128.0 / 81, 27.0 / 16,
16.0 / 9, 243.0 / 128, 2.0].at(r % 12) * 2.0 ** r.divmod(12).first
end
def rbell(x)
envelope_interp(x * 100.0, [0, 0.0, 10, 0.25, 90, 1.0, 100, 1.0])
end
end
def agn
f = FM_Forever2.new
f.make_agn
f.start_dac do f.agn end
end
# see clm-2/rt.lisp
def rt_test(time = 30)
lim = 256
mode = [0, 12, 2, 4, 14, 4, 5, 5, 0, 7, 7, 11, 11]
pits = Array.new(lim + 1) do
mus_random(12.0).abs.floor
end
begs = Array.new(lim + 1) do
1 + mus_random(3.0).abs.floor
end
with_dac do
cellbeg = 0
cellsiz = 6
cellctr = 0
mytempo = 0.3
beg = 0.0
while beg < time and cellctr < lim
dur = mytempo * begs[cellctr + 1]
beg += dur
frq = 16.351 * 16.0 * 2.0 ** (mode[pits[cellctr]] / 12.0)
cellctr += 1
if cellctr > (cellsiz + cellbeg)
cellbeg += 1 if mus_random(1.0).abs > 0.5
cellsiz += 1 if mus_random(1.0).abs > 0.5
cellctr = cellbeg
end
fm_violin(beg, dur, frq, 0.25)
end
end
end
# agn
# rt_test
# bess1.rb ends here
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