mid2beep

#!/bin/bash

containsElement () {
  local e
  for e in "${@:2}"; do [[ "$e" == "$1" ]] && return 0; done
  return 1
}
compute () {
  LANG=POSIX
  LC_NUMERIC=POSIX
  printf '%.2f' $(bc -l <<< "$1")
}
#IFS=$'\n'

displayinfos=NO
quiet=NO
channel=1
userspeed=1
showbeep=YES
showprogress=YES
midifile=""

usage=" $(basename "$0") [-b] [-c=n] [-h] [-i] [-p] [-q] [-s=n] -m=file\n
Program to play a midi track on the PC speaker/buzzer\n
 where:\n
	\t\t-b Do not display beep command\n
	\t\t-c Choose the MIDI channel you want to play (default : 1)\n
	\t\t-h Display this help\n
	\t\t-i Display infos about the MIDI file (useful for finding channels)\n
	\t\t-m MIDI file to play (mandatory)\n
	\t\t-p Do not display progress info\n
	\t\t-q Doesn't play a sound\n
	\t\t-s Modify the speed of playback (not limited to int)"

for i in "$@"
do
	case $i in
		-s=*|--speed=*)
		userspeed="${i#*=}"
		shift
		;;
		-m=*|--midi=*)
		midifile="${i#*=}"
		shift
		;;
		-c=*|--channel=*)
		channel="${i#*=}"
		shift
		;;
		-q|--quiet)
		quiet=YES
		shift
		;;
		-b|--hidebeep)
		showbeep=NO
		shift
		;;
		-p|--noprogress)
		showprogress=NO
		shift
		;;
		-i|--infos)
		displayinfos=YES
		shift
		;;
		-h|--help)
		echo -e $usage
		exit
		;;
		*)
				# unknown option
		;;
	esac
done

if [[ $midifile == "" ]]; then
	echo -e $usage
	exit
fi


command=""
factor=1
tracks=()

{
	IFS=$'\n'
	tab=( $(midi2abc $midifile -midigram) )
}

{
	IFS=$''
	infos=( $(midi2abc $midifile -sum) )
}


ticks=`od -An -j 12 -N 2 --endian=big -vd $midifile | xargs`
bpm=`echo "${infos[@]}" | grep Tempo | awk '{print $2}'`
factor=`compute "60000/($bpm*$ticks)"`


lastend=10000000
lastfirst=10000000

for (( i=0; i<=${#tab[@]}; i++ ))
do
	if [[ $showprogress == YES ]]; then
		echo -ne " Done $i notes on ${#tab[@]}      \r"
	fi
	{
	IFS=' '
	arr=( ${tab[$i]} )
	}
	first=${arr[0]}
	track=${arr[3]}
	if [[ $displayinfos == YES ]]; then
		containsElement "$track" "${tracks[@]}"
		if [[ $? -eq 1 ]]; then
			tracks+=(${track})
		fi
	fi
	if [ "$track" = "$channel" ] && [ $lastfirst -ne $first ]; then
		second=${arr[1]}
		midinote=${arr[4]}
		delay=`compute "$userspeed*$factor*($first-$lastend)"`
		note=`compute "440*e((($midinote-69)/12)*l(2))"`
		time=`compute "$userspeed*$factor*($second-$first)"`
		if (( $(bc <<< "$delay > 0") )); then
			command="$command -D $delay"
		fi
		command="$command -n -f $note -l $time"
		lastend=$second
		lastfirst=$first
	fi
done

if [[ $displayinfos == YES ]]; then
	output="Length ${#tab[@]} ; Ticks $ticks ; BPM $bpm ; Speed factor $factor ; NbChannels ${#tracks[@]} :"

	for (( i=0; i<=${#tracks[@]}; i++ ))
	do
		output="$output ${tracks[$i]}"
	done

	echo "$output"
fi

if [[ $showbeep == YES ]]; then
	echo "beep `echo $command | cut -b1-`"
fi

if [[ $quiet == NO ]]; then
	echo $command | cut -b1- | xargs beep 
fi