24 lines
1.2 KiB
Bash
24 lines
1.2 KiB
Bash
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#!/bin/sh
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# ShellBeat: a Busybox-compatible Bytebeat player with purely shell arithmetic syntax
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# depends on xxd only
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# By default, SoX is also required, or change the PLAYCMD variable to your engine
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# (see some commented examples, some of them only accept 8Khz sample rate)
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# Usage: shellbeat.sh 'formula'[ samplerate=8000]
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# Example test on "42 melody": sh shellbeat.sh 't * (42 & (t >> 10))'
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# Created in 2023 by Luxferre, released into public domain
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FORMULA="$1"
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SAMPLERATE="$2"
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[ -z "$FORMULA" ] && printf 'No formula!\n' && exit
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[ -z "$SAMPLERATE" ] && SAMPLERATE=8000
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PLAYCMD="play -q -tu8 -r${SAMPLERATE} -c1 -" # most universal option with SoX play command
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# or else uncomment one of these if you don't have SoX:
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#PLAYCMD="tee /dev/dsp" # if you have bare OSS (only 8KHz input)
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#PLAYCMD="aplay -q -f U8 -r ${SAMPLERATE}" # if you have ALSA
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#PLAYCMD="pacat --raw --format=u8 --rate=${SAMPLERATE} --channels=1" # if you have PulseAudio
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#PLAYCMD="pw-play --format=u8 --rate=${SAMPLERATE} --channels=1 -" # if you have PipeWire
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printf 'ShellBeat by Luxferre\nPlaying formula: %s\nSample rate: %d Hz\n' "$FORMULA" "$SAMPLERATE"
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(t=0; while true; do printf '%02X\n' "$((255&(${FORMULA})))"; t=$((t+1)); done) | xxd -r -p | $PLAYCMD > /dev/null
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