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November 15, 2019 13:20
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commandline hq samplerate reducer for pre-processing audiofiles for hardware samplers (free bitcrush effect!)
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#!/bin/bash | |
[[ ! -n "$1" ]] && { | |
echo "Usage: ./downsample <input.wav> <output.wav> " | |
echo " DOWNSAMPLE=6 MONO=1 ./downsample in.wav out.wav "; | |
echo " TREBLE=3 RATE=22500 DOWNSAMPLE=4 GAIN=1 ./downsample in.wav out.wav "; | |
exit | |
} | |
calc(){ | |
echo "$1" | bc -l | |
} | |
gate(){ | |
# a-law has a compader | |
sox -V "$1" -e signed -b 8 -r 22500 -c 1 "$1".tmp.wav | |
mv "$1".tmp.wav "$1" | |
sox -V "$1" -e a-law -b 8 -r 22500 -c 1 "$1".tmp.wav | |
mv "$1".tmp.wav "$1" | |
} | |
downsample(){ | |
[[ -f "$2" ]] && echo "deleting!!!!!!!!!" && rm "$2" | |
[[ -n $RATE ]] && rate=$RATE || rate=30000 | |
[[ -n $DOWNSAMPLE ]] && downsample="norm downsample $DOWNSAMPLE upsample $DOWNSAMPLE" || downsample="" | |
sox "$1" -n stats 2>&1 | grep Left &>/dev/null | |
[[ $? == 0 ]] && channels=2 || channels=1 | |
[[ -n $MONO ]] && channels=1 | |
[[ ! -n $BITS ]] && BITS=16 | |
[[ $BITS == 8 ]] && ENCODING=a-law || ENCODING=signed-integer | |
soxopts="-e $ENCODING -b $BITS -D -r $rate -c $channels" | |
cp "$1" /tmp/in.wav | |
[[ -n $TREBLE ]] && { | |
sox /tmp/in.wav -c 2 "$2".hp.wav highpass $(( (rate/2)-2000)) gain +$TREBLE | |
sox -M /tmp/in.wav "$2".hp.wav -c 2 "$2".final.wav | |
mv "$2".final.wav /tmp/in.wav ; | |
} | |
echo sox -V /tmp/in.wav ${soxopts} "$2" ${downsample} | |
sox -V /tmp/in.wav ${soxopts} "$2" ${downsample} | |
[[ -n GAIN ]] && { | |
sox "$2" "$2".gain.wav gain $GAIN | |
mv "$2".gain.wav "$2"; | |
} | |
} | |
downsample "$@" |
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