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用mpg123播放https协议的URL MP3

 2 years ago
source link: https://www.lujun9972.win/linux%E5%92%8C%E5%AE%83%E7%9A%84%E5%B0%8F%E4%BC%99%E4%BC%B4/2016/10/24/%E7%94%A8mpg123%E6%92%AD%E6%94%BEhttps%E5%8D%8F%E8%AE%AE%E7%9A%84url-mp3/%20or%20/linux%E5%92%8C%E5%AE%83%E7%9A%84%E5%B0%8F%E4%BC%99%E4%BC%B4/%E7%94%A8mpg123%E6%92%AD%E6%94%BEhttps%E5%8D%8F%E8%AE%AE%E7%9A%84url-mp3/
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用mpg123播放https协议的URL MP3

mpg123本身是支持URL MP3的,可惜它只支持http协议的url mp3.

好在mpg123还支持从standard input中读取MPEG data,这样以来我们可以通过组合curl与mpg123来实现播放https协议的URL MP3. 

#!/bin/bash

# play https mp3 using mpg123

function https_url_p ()
{
    local url=$1
    echo $url |egrep "^https://" >/dev/null
}

uri=$1
if https_url_p $uri;then
    curl -L $uri | mpg123 -
else
    mpg123 $curi
fi

原理很简单:

先判断一个文件是否以 https:// 开头,若是的话,则认为是https url mpg3,那么通过curl将其内容取出来,通过管道发给mpg123来播放.

事实上,curl支持超多的网络协议,你可以很容易的扩展到file,ftp,ftps,rtmp等各种网络协议上.

不过要一个一个判断网络协议的种类就太麻烦了,可以简化成这样: 

mpg123 $1 || curl -L $1 |mpg123 -

先尝试用mpg123直接播放,失败的话再听过curl获取MPEG DATA交给mpg123来播放.


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