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Bash Scripting Sound Audio Beep pcspkr
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#!/bin/bash | |
# 255 mysmps SIMPLE SAWTOOTH SOUND | |
# <-----------------------> \/\/\/\/\/\/\/\/\/\/\ | |
# . . A beep for bash shell | |
# | mypeak | for machines without | |
# \ | /\ pc speaker beep \007. | |
# \ | / \ | |
# \ | / \ It requires alsa and | |
# \ | / \ 'play' via alsautils. | |
# \ | / \ | |
# \ | / \ | |
#126 ---------------------|--------------------------------------------------------- | |
# \ | / \ | |
# \ | / \ / | |
# \ | / \ / | |
# \ | / When invoking mynote() \ / | |
# \ / mysmps * myslop may not \ / | |
# \/ exceed 255. We entrust \/ | |
# mytrou you to use mynote with | |
# care & respect for math. | |
# | |
# 1 | |
mynote() { | |
mysmps=$1 # number of samples before wave reverses (1/2 cycle) | |
myslop=$2 # vertical step increment of the slope (steepness) | |
mycycl=$3 # number of times to repeat (duration of beep) | |
mypeak=$((126 + mysmps)) | |
mytrou=$((126 - mysmps)) | |
for ((i = 1; i <= mycycl; i++)); do # outer loop: cycles | |
for ((j = mypeak; j >= mytrou; j -= myslop)); do # falling slope | |
printf -v hex %x "$j" # hexen magic | |
printf "\x$hex" | |
done | |
for ((j = mytrou; j <= mypeak; j += myslop)); do # rising slope | |
printf -v hex %x "$j" | |
printf "\x$hex" | |
done | |
done | |
} | |
bignote=$(mynote 24 4 300) | |
#echo -ne "$bignote" > /tmp/beep.raw # Save for visual inspection or | |
#od -tx1 /tmp/beep.raw # further adventures in beeping. | |
for i in {1..50}; do # Repeat for beeping glory. | |
for i in {1..3}; do | |
echo -ne "$bignote" | aplay -t raw -q -f U8 --channels=2 --rate=48000 | |
sleep 0.7s | |
done | |
sleep 3s | |
done |
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