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libsox.sh
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libsox.sh
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#!/bin/sh
: '
Copyright (C) 2022-2023 Job Bautista
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
'
setTempo()
{
BPM=$1
if [ -z $2 ]
then
precision=3
else
precision=$2
fi
# durations
fu=$(echo "scale=$precision; 240 / $BPM" | bc -l) # Whole note
ha=$(echo "scale=$precision; 120 / $BPM" | bc -l) # Half note
qu=$(echo "scale=$precision; 60 / $BPM" | bc -l) # Quarter note
ei=$(echo "scale=$precision; 30 / $BPM" | bc -l) # Eighth note
si=$(echo "scale=$precision; 15 / $BPM" | bc -l) # Sixteenth note
dha=$(echo "scale=$precision; 180 / $BPM" | bc -l) # Dotted-half note
dqu=$(echo "scale=$precision; 90 / $BPM" | bc -l) # Dotted-quarter note
dei=$(echo "scale=$precision; 45 / $BPM" | bc -l) # Dotted-eighth note
dsi=$(echo "scale=$precision; 22.5 / $BPM" | bc -l) # Dotted-sixteenth note
tqu=$(echo "scale=$precision; 40 / $BPM" | bc -l) # Triplet-quarter note
tei=$(echo "scale=$precision; 20 / $BPM" | bc -l) # Triplet-eighth note
tsi=$(echo "scale=$precision; 10 / $BPM" | bc -l) # Triplet-sixteenth note
}
defaultsynth="sin" # for backwards compatibility with previous
synthtype="$defaultsynth" # child scripts that only used sine
setDefaultSynthType()
{
defaultsynth=$1
synthtype="$defaultsynth"
}
silence()
{ # needed because pluck synth doesn't support zero frequency
duration=$1
createSoxPipes # necessary because we will be changing synth type
synthtype="sin" # sin, square, sawtooth, trapezium, and exp support freq=0
notes="$duration:0"
createSoxPipes # get the silence printed before we return to default synth
synthtype="$defaultsynth"
}
octave=0
decreaseOctave()
{
octave=$(($octave - $1))
}
increaseOctave()
{
octave=$(($octave + $1))
}
volume=0.7
setVolume()
{
volume=$1
}
maxChannels=1 # for backwards compatibility with most scripts that only used
# one synth channel
seq()
{ # In case seq(1) is not available
num=$1
while [ $num -le $2 ]
do
echo $num
num=$(($num + 1))
done
}
createSoxPipes()
{
for note in $notes
do
if [ $maxChannels -eq 1 ]
then
printf '"|sox -n -p synth '$(echo "$note" |
sed 's/:.*//')' '$synthtype' '$(echo "$note" |
sed 's/.*://;' | tr '[a-z]' '[A-Z]')'"\n'
else
printf '"|sox -n -p synth '$(echo "$note" | sed 's/:.*//')''
for n in $(seq 1 $maxChannels)
do
lastExistingNote=$(echo "$note" | sed 's/.*://;' | cut -d / -f "$n" | tr '[a-z]' '[A-Z]')
back=1
while [ -z $lastExistingNote ]
do
lastExistingNote=$(echo "$note" | sed 's/.*://;' | cut -d / -f "$(($n - $back))" | tr '[a-z]' '[A-Z]')
back=$(($back + 1))
done
finalkey=$(echo "$lastExistingNote" | head -c -2)
finaloctave=$(($(echo "$lastExistingNote" | tail -c 2) + $octave))
finalnote="$finalkey$finaloctave"
printf ' '$synthtype' '$finalnote''
done
for n in $(seq 1 $maxChannels)
do
printf ' vol '$volume''
done
printf '"\n'
fi
done
}
notes()
{
notes=$1
createSoxPipes
}