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music.bash
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#!/bin/bash
(($#)) && song=("$@") ||
song=(
# für elise
e5:50 ds5:50 e5:50 ds5:50 e5:50 b4:50 d5:50 c5:50 a4:150
c4:50 e4:50 a4:50 b4:150 e4:50 gs4:50 b4:50 c5:150 e4:50
e5:50 ds5:50 e5:50 ds5:50 e5:50 b4:50 d5:50 c5:50 a4:150
c4:50 e4:50 a4:50 b4:150 e4:50 c5:50 b4:50 a4:200
pause
c4+e4+g4:200 # I
b3+d4+g4:200 # V
c4+e4+a4:200 # vi
c4+f4+a4:200 # IV
silence
g4:66 g4:33 a4 g4 c5 b4:200 # happy birthday to you
g4:66 g4:33 a4 g4 d5 c5:200 # happy birthday to you
g4:66 g4:33 g5 e5 c5 b4 a4 # happy birthday dear tom
f5:66 f5:33 e5 c5 d5 c5:300 # happy birthday to you
)
samples=8000 # sample at 8khz
inter=500 # default note is half a second long (value in ms)
adsr=(18 100 17 10) # envelope (values in ms ms % ms)
# for now this assumes minimum note length = attack + decay + release
# there will be audible pops if any notes are shorter
# you probably don't need to modify the rest of the script if you just want to play songs :)
player () {
if [[ -t 1 ]]; then
if command -v mpv >/dev/null; then
mpv --no-video \
--demuxer=rawaudio \
--demuxer-rawaudio-format=s16le \
--demuxer-rawaudio-rate="$samples" \
--demuxer-rawaudio-channels=1 \
--no-terminal -
elif command -v ffplay >/dev/null; then
ffplay \
-v -8 -nodisp -nostats -hide_banner -autoexit \
-f s16le -ar "$samples" -ch_layout mono -
elif command -v aplay >/dev/null; then
aplay -f S16_LE -r "$samples" -
fi
else
cat
fi
}
scale=$((32*1024-1))
pi=102941
pi2=205881
pisq=10596760227
pi_2=51470
pi3_2=154411
cosine='(pisq-4*y*y)*scale/(pisq+y*y)'
# yes this is 5 quadrants because pi_2*4==pi2-1
# tom's idea btw
coscalc=(x pi-x x-pi x-pi2 x-pi2)
cosmult=(1 -1 -1 1 1 )
cos=(
"y=${coscalc[0]},${cosmult[0]%1}cosine"
"y=${coscalc[1]},${cosmult[1]%1}cosine"
"y=${coscalc[2]},${cosmult[2]%1}cosine"
"y=${coscalc[3]},${cosmult[3]%1}cosine"
"y=${coscalc[4]},${cosmult[4]%1}cosine"
)
umax=$((64*1024))
declare -A binary
for ((i=0;i<umax;i++)) do
printf -v tmp '\\x%02x\\x%02x' "$((i&0xff))" "$((i>>8))"
binary[$i]=$tmp binary[$((i-umax))]=$tmp
done
# notes = ['c', 'cs', 'd', 'ds', 'e', 'f', 'fs', 'g', 'gs', 'a', 'as', 'b']
# scale = 32 * 1024 - 1
# a4 = 440 * scale
# a4idx = 12 * 4 + 9
# for i in range(8*12):
# print(f"[{notes[i%12]}{i//12}]={int(2 ** ((i-a4idx)/12) * a4)}")
declare -A notes=(
[c0]=535792 [cs0]=567652 [d0]=601407 [ds0]=637168 [e0]=675056 [f0]=715197 [fs0]=757725 [g0]=802782 [gs0]=850518 [a0]=901092 [as0]=954674 [b0]=1011442
[c1]=1071585 [cs1]=1135305 [d1]=1202814 [ds1]=1274337 [e1]=1350113 [f1]=1430395 [fs1]=1515450 [g1]=1605564 [gs1]=1701036 [a1]=1802185 [as1]=1909348 [b1]=2022884
[c2]=2143171 [cs2]=2270610 [d2]=2405628 [ds2]=2548674 [e2]=2700226 [f2]=2860790 [fs2]=3030901 [g2]=3211128 [gs2]=3402072 [a2]=3604370 [as2]=3818696 [b2]=4045768
[c3]=4286342 [cs3]=4541221 [d3]=4811256 [ds3]=5097348 [e3]=5400453 [f3]=5721580 [fs3]=6061803 [g3]=6422257 [gs3]=6804144 [a3]=7208740 [as3]=7637393 [b3]=8091537
[c4]=8572684 [cs4]=9082443 [d4]=9622513 [ds4]=10194697 [e4]=10800906 [f4]=11443161 [fs4]=12123607 [g4]=12844514 [gs4]=13608289 [a4]=14417480 [as4]=15274787 [b4]=16183074
[c5]=17145369 [cs5]=18164886 [d5]=19245026 [ds5]=20389395 [e5]=21601812 [f5]=22886322 [fs5]=24247214 [g5]=25689028 [gs5]=27216578 [a5]=28834960 [as5]=30549575 [b5]=32366148
[c6]=34290739 [cs6]=36329773 [d6]=38490053 [ds6]=40778791 [e6]=43203624 [f6]=45772645 [fs6]=48494428 [g6]=51378057 [gs6]=54433156 [a6]=57669920 [as6]=61099151 [b6]=64732296
[c7]=68581479 [cs7]=72659546 [d7]=76980107 [ds7]=81557583 [e7]=86407249 [f7]=91545291 [fs7]=96988857 [g7]=102756115 [gs7]=108866312 [a7]=115339840 [as7]=122198303 [b7]=129464593
)
# todo: make decay optional and calculate the right lengths on each note
envelope='
j < attack_e ? j*scale/attack :
j < decay_e ? scale+(j-attack_e)*decrease/decay :
j < release_s ? sustain :
sustain-(j-release_s)*sustain/release
'
envelope=${envelope//[[:space:]]}
((
attack = samples*adsr[0]/1000,
decay = samples*adsr[1]/1000,
sustain = scale *adsr[2]/100 ,
release = samples*adsr[3]/1000,
attack_e = decay_s = attack,
decay_e = sustain_s = decay + attack_e,
decrease = sustain - scale,
ssamples = samples * scale
))
harmonics="sample+=cos[(x=(freq*pi2*t/ssamples)%pi2)/pi_2]"
hnum=${hnum-4}
for ((i=2;i<=hnum;i++)) do
harmonics+=",sample+=cos[(x=($i*freq*pi2*t/ssamples)%pi2)/pi_2]/$((2**(i-1)))"
done
IFS=+
set -f
for note in "${song[@]}"; do
[[ $note =~ ([^:]*)(:(.*))? ]]
freqs=()
for note in ${BASH_REMATCH[1]}; do
freqs+=(${notes[$note]})
done
notel=$((samples*inter*${BASH_REMATCH[3]:-100}/100000)) \
release_s=$((notel-release))
for ((j=0;j<notel;j++,t++)) do
sample=0
for freq in "${freqs[@]}"; do
((harmonics))
done
printf %b "${binary[$((sample*envelope/scale/10))]}"
done
done | player