播放音乐的script

时间：2008-08-31 来源：ubuntuer

昨天打包download了很欧美乡村音乐,鼠标放在music上面想看看具体name,猛的音乐响起,当时是在实验室,吓了老子一跳,原来ubuntu有这么个小function
今天索性就写了个播放音乐的script,调用的是mplayer.
用法很简单：脚本名音乐目录
然后有一些操作：
a) level up
s) level down -.-
d) 查看当前 level
l) 列出播放列表
c)清除屏幕
n) 下一首
m) 上一首
q) 退出
要说一下的是，level在这里的含义，当它为1时，你按下［1－9］就会自己播放第［1－9］首音乐
为2时，你就得按两个数字播放第10-99首音乐，按下a可以使level升级，s则相反，d查看当前level
下面是代码，（如果有什么疑问或讨论在这里留言或给我发EMAIL：[email protected]）
请不要说这东西有没用，过时不过时的话题，因为这仅仅是练习，谢谢～
补充一下，后台调用的是mplayer，如果没有安装就无法正常使用，不过可以自己改一下代码。just for fun

代码:

#!/bin/bash
myplayer (){ #后台调用播放音乐函数
if which mplayer >/dev/null;then
exec mplayer "$1" >&/dev/null #用exec调用替换进程
fi
}
rmNumfile(){
if [ -f .num ];then
   rm .num
fi
}
rmMenufile(){
if [ -f .menu ];then
   rm .menu
fi
}
#define some signals
sigNext=25
sigPre=26
sigExit=27
sigNum=28
#
#you can add some more

#以下为操作处理函数
next(){
# kill -$sigNext $1
# echo "kill -$sigNext $1"
echo "下一个..."
kill -$sigNext $1
}
pre(){
# echo "kill -$sigPre $1"
echo "上一个..."
kill -$sigPre $1
}
myexit(){
echo "接收到退出信号，请稍等..."
kill -$sigExit $1
sleep 2
echo "主进程退出！"
}
csnum(){

echo "选中第$(cat .num) 首。"
# echo "`expr $1 - 1`" > .num
kill -$sigNum $2
}
getkey(){
local state substate oldstate
state=1
oldstate=$state
   rmNumfile
   rmMenufile
# echo mypid=$$ #主进程ID
getkeypid=$1
   trap "rmNumfile; rmMenufile; kill -$sigexit $getkeypid;" 2 3
while true
   do
read -s -n 1 ans
#    echo $ans
   case "$ans" in
      [nN]|[jJ])
         next $getkeypid
         ;;
      [mM]|[kK])
         pre $getkeypid
         ;;
      q|Q)
         myexit $getkeypid
            exit 0
         ;;
      [0-9]) if [ "$state" == "1" ];then
         echo -n "$ans" >> .num
         csnum $ans $getkeypid
         state="$oldstate"
         elif [ "$state" == "2" ];then
         echo -n "$ans" >>.num
         state=`expr "$state" - 1`
         elif [ "$state" -eq "3" ];then
         echo -n "$ans" >.num
         state=`expr "$state" - 1`
         else
            echo "an error accur"
         fi
         ;;
      a|A) if [ "$oldstate" -lt "3" ];then
               oldstate=`expr "$oldstate" + 1`
            echo "now level $oldstate"
         else
            echo " now level $oldstate"
         fi
            state=$oldstate
            rmNumfile
         ;;
      s|S) if [ "$oldstate" -gt "1" ];then
            oldstate=`expr "$oldstate" - 1`
            echo "now level $oldstate"
         else
            echo "now level $oldstate"
         fi
            state=$oldstate
            rmNumfile
         ;;
      d|D) echo "now level $oldstate"
         ;;
      l|L) clear
         cat .menu
         ;;
      c|C) clear
         ;;
      *) echo no such op;;
      esac
   done
}

NothingPlay(){
echo There is nothing mp3,please input Q to exit!
}

getpid(){ #暂时没用到的函数
ppid=$(ps aux|grep "myplayer" |grep -v "grep")
   if [ "$ppid" == "" ];then
      return -1;
   fi
   pid=$(echo $ppid |awk '{print $2}')
   return $pid
}

killpid(){
kill -9 "$1" >&/dev/null
   return "$?"
}
myUsage(){
cat << EOF

   Usage: $APP_NAME [MusicDIRCTORY]

   Start playing Music.(version $APP_VERSION)
   @GPL

-h, --help display this help and exit

   some operations for example:
   a) level up
   s) level down :)
   d) show current level
   l) list menu
   n) next
   m) pre
   q) exit
   for more message,please send email to [email protected]
EOF

}
#信号处理部分
#do_sigNum(){
# if [ "$glNum" != "" ]
#    then
#       n=`expr $glNum + 0 ` #转换为数字
#    else
#    n=1 #从头开始
#    fi
#    killpid $mplayerpid
#}
runAskey(){ #后台守护进程
#定义本地变量
local line n playing;
# 在此进行信号挂载
trap 'killpid $mplayerpid;rmNumfile;rmMenufile;exit 0;' $sigExit
trap 'killpid $mplayerpid ;' $sigNext
trap ' n=`expr "$n" - 2`;killpid $mplayerpid ;' $sigPre
# trap ' n=`awk \' NR==1 {print $1;}\' .num`;killpid $mplayerpid;' $sigNum
trap ' n=$((($(cat .num) - 1))) ;rmNumfile;killpid $mplayerpid;' $sigNum
# echo $1
if [ ! -d "$1" ]
   then
      myUsage
      echo "please input Q to exit"
      exit 0
fi

line=`ls $1|grep '.mp3' |wc -l`

if [ "$line" == "0" ]
   then
      NothingPlay
      exit 0
fi
n=1
ls $1|grep .mp3|awk '{print NR,$0}' | tee .menu
while [ "$n" -le "$line" ]
   do
   playing=$(ls $1|grep .mp3|sed -n ''"$n"'p')
      echo "正在播放:$playing 下一首：$(ls $1|grep .mp3|sed -n ''"$((($n+1)))"'p')"
if [ -f "$1"/"$playing" ];then #调整目录结构
myplayer "$1"/"$playing"&
else
if [ -f "$1""$playing" ];then
   myplayer "$1""$playing" &
   fi

fi
mplayerpid="$!"
# echo "mplayerpid=$mplayerpid" 保存音乐进程ID
wait $mplayerpid #等待音乐结束
   sleep 2
   n=`expr "$n" + 1` #播放下一首
   echo "请等待..."
   done
   echo "播放完毕，按 ‘q‘以退出！"
   while :
      do
      sleep 10
      done
}
APP_NAME="${0##*[\\/]}"
APP_VERSION="0.0"
directory="$1"
if [ "$2" == "--show" ];then
runAskey $directory
else
$0 "$1" --show & #启动后台守护进程
#echo "pid=$!"
if [ "$1" != "-h" ];then
if [ "$1" != "--help" ];then
   getkey $! #启动前台接收操作
fi
fi
fi