History of MP3Jukeboxの制御スクリプト(No. 1)

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MP3Jukeboxの制御スクリプト has been deleted.
- 1 (2005-07-17 (Sun) 12:03:40)
- 2 (2005-07-17 (Sun) 12:30:22)
こげな感じ*1。
#!/bin/sh

#######################
#
# Simple MP3 Jukebox
# KAWAMATA, Yoshihiro
# kaw@on.rim.or.jp
#
#######################

#=====
# utility functions / routines
#=====

# terminate process
#
terminate () {
    [ $# -ne 0 ] &&  echo "$@"
    rm -rf ctrl/playing
    [ -r ctrl/finish ] && . ctrl/finish
}

# trap for ^C
#
trap 'terminate "Aborted by user" ; exit' 2

# check flags,
# fetch a file,
# play it
#
# Usage: play_one_action { local_file | URL }
#
play_one_action () {
    [ $# -eq 0 ] && return

    # halt, reboot or exit
    #
    if [ -f ctrl/halt ]; then
        terminate "Halting..."
        rm -f ctrl/halt
        /sbin/shutdown -hp now

    elif [ -f ctrl/reboot ]; then
        terminate "Rebooting..."
        rm -f ctrl/reboot
        /sbin/shutdown -r now

    elif [ -f ctrl/restart ]; then
        terminate "Restarting scipt..."
        rm -f ctrl/restart
        exec $progfile

    elif [ -f ctrl/exit ]; then
        terminate "Exiting..."
        rm -f ctrl/exit
        exit
    fi

    # clean non-MP3 file and empty directories under spool
    #
    if [ -f ctrl/clean ]; then
        echo "Clearning dirs..."
        rm -f ctrl/clean
        find $src $dest oneshot oneshot_finished -type f \! \( -iname '*.mp3' -o -iname '*.url' \) -print0 | xargs -0 rm -f
        for d in $src $dest oneshot oneshot_finished; do
            (cd $d  && find . -type d -print | sort -r | xargs rmdir >/dev/null 2>&1)
        done
    fi

    # pause playing
    #
    if [ -f ctrl/pause ]; then
        echo "Pausing..."
        while [ -f ctrl/pause ]; do
          sleep 15
        done
    fi

    # play MP3 file
    #
    # ... invoke MP3 player with high priority
    #
    case "$1" in
        http://*.mp3|ftp://*.mp3)
            #
            # Cats are buffers against network stall.
            # Please adjust its numbers, if necessary.
            #
            ftp -o - "$1" |cat|cat|cat| nice -n -15 /usr/local/bin/mpg123 $opts -
            ;;
        *.[Mm][Pp]3)
            if [ -f "$1" ]; then
                nice -n -15 /usr/local/bin/mpg123 $opts "$1"
            else
                echo "Cannot find $1"
            fi
            ;;
    esac
}


# move played file to another directory.
# directory hierarchy preserved.
#
# Usage: movefile srcpath desttop
#
movefile () {
    [ $# -lt 2 ] && return
    destdir=$2/${1#*/}
    destdir=${destdir%[^/]*}
    if [ -d $destdir ]; then
        mv $1 $destdir
    else
        su mp3play -c "mkdir -p $destdir" && mv $1 $destdir
    fi
}


#=====
# Running code from here
#=====

# Base and current directory is where script placed.
#
progfile=$0
cd `dirname $progfile` || exit 1

# check if another player running
#
if mkdir ctrl/playing; then
    date > ctrl/playing/started
    chmod 0000 ctrl/playing
else
    echo "Another player running"
    exit 1
fi

# remove stale files
#
rm -f ctrl/exit ctrl/reboot ctrl/halt

# user initialization
#
[ -r ctrl/init ] && . ctrl/init

#=====
# main loop ... play MP3 and its control
#=====
while :; do
    # parameters to MP3 player
    #
    unset opts
    [ -f ctrl/mpg123opts ] && opts=`cat ctrl/mpg123opts`

    # We have two spool directories for infinite loop
    # ... spool0 and spool1.
    #
    # set direction of file movement
    # between two spools
    # when every MP3 file played
    #
    if [ -f ctrl/reverse ]; then
         src=spool1
        dest=spool0
    else
         src=spool0
        dest=spool1
    fi

    # playlist is symlink to spool for playing.
    #
    rm -f playlist
    ln -s $src playlist

    # for every MP3 files
    #   control and/or playing
    #
    for playfile in `find $src -type f \( -iname '*.mp3' -o -iname '*.url' \) | sort`; do

        # retrieve resource location
        #
        case "$playfile" in
            *.[Uu][Rr][Ll])
                mp3reslist=`cat $playfile`
                ;;
            *.[Mm][Pp]3)
                mp3reslist=$playfile
                ;;
        esac

        # for every MP3 resource ...
        #
        for mp3res in $mp3reslist; do

            # perform one shot playlist
            #
            for oneshot in `find oneshot -type f \( -iname '*.mp3' -o -iname '*.url' \) | sort`; do
                # retrieve resource location
                #
                case "$oneshot" in
                    *.[Uu][Rr][Ll])
                        oneshot_mp3res=`cat $oneshot`
                        ;;
                    *.[Mm][Pp]3)
                        oneshot_mp3res=$oneshot
                        ;;
                esac

                for os_mp3 in $oneshot_mp3res; do
                    play_one_action $os_mp3

                    # restart at current spool
                    #
                    if [ -f ctrl/rescan ]; then
                        break 2
                    fi
                done

                movefile $oneshot oneshot_finished
            done

            play_one_action $mp3res

            # restart at current spool
            #
            if [ -f ctrl/rescan ]; then
                echo "Recanning playlist..."
                break 2
            fi
        done

        # move played file to the other spool
        #
        movefile $playfile $dest
    done

    # pause when no MP3 files in spools
    #
    if [ X"$playfile" = X ]; then
        noplay=Z$noplay
        echo "No file to play : $noplay"
        if [ $noplay = ZZ ]; then
            echo "Now sleeping for 60 secs..."
            sleep 60
            noplay=""
        fi
    else
        noplay=""
    fi

    # role change of spools
    # (not changing when rescan)
    #
    if [ -f ctrl/rescan ]; then
        rm -f ctrl/rescan
    else
        if [ -f ctrl/reverse ]; then
            rm -f ctrl/reverse
        else
            touch ctrl/reverse
        fi
    fi
done
History of MP3Jukeboxの制御スクリプト (No. 1)
