ESD 简单说就是一个混音器，但是它允许用户从网络上进行访问（network transparent），这意味着你可以在一台机器上打开播放器，另外一台机器的喇叭响了。这也是采用了 CS 构架的原因。之后有很多类似的项目用来取代 ESD，有的已经停止了开发比如 aRtsD，有的尚还在开发（RoarAudio）或者已经比较完整（如 JACK Audio Connection Kit、NAS 和 PurseAudio），有的和 ESD 类似也是 network transparent，有的不是。
debian 里面服务器在 esound 里面，
/usr/bin/esd客户端在 esound-clients 里面
/usr/share/man/man1
/usr/share/man/man1/esd.1.gz
/usr/share/doc/esound
/usr/share/man/man1/esddsp.1.gz另外一部分在 esound-common 里面，
/usr/share/man/man1/esdfilt.1.gz
/usr/share/man/man1/esdloop.1.gz
/usr/share/man/man1/esdmon.1.gz
/usr/share/man/man1/esdplay.1.gz
/usr/share/man/man1/esdrec.1.gz
/usr/share/man/man1/esdcat.1.gz
/usr/share/man/man1/esdctl.1.gz
/usr/share/man/man1/esdsample.1.gz
/usr/lib/esound/libesddsp.so.0.2.39
/usr/lib/mime/packages/esound-clients
/usr/bin/esdcat
/usr/bin/esdctl
/usr/bin/esddsp
/usr/bin/esdfilt
/usr/bin/esdloop
/usr/bin/esdmon
/usr/bin/esdplay
/usr/bin/esdrec
/usr/bin/esdsample
/usr/share/doc/esound-clients
/usr/lib/esound/libesddsp.so.0
/etc/esound/esd.conf其实使用 ESD 很简单，一般或者有某些程序的 module 支持 ESD 输出，可以通过命令行参数 -s server:port 指定或者设定 ESPEAKER 环境变量。
/usr/share/doc/esound-common/TIPS
/usr/share/doc/esound-common/TODO
/usr/share/doc/esound-common/html
/usr/share/doc/esound-common/html/x66.html
/usr/share/doc/esound-common/html/r311.html
/usr/share/doc/esound-common/html/r313.html
/usr/share/doc/esound-common/html/x296.html
/usr/share/doc/esound-common/html/x299.html
/usr/share/doc/esound-common/html/x179.html
/usr/share/doc/esound-common/html/x241.html
/usr/share/doc/esound-common/html/x302.html
/usr/share/doc/esound-common/html/index.html
/usr/share/doc/esound-common/html/x305.html
/usr/share/doc/esound-common/html/x119.html
/usr/share/doc/esound-common/html/c250.html
/usr/share/doc/esound-common/html/x308.html
/usr/share/doc/esound-common/html/x26.html
/usr/share/doc/esound-common/html/c76.html
/usr/share/doc/esound-common/html/x259.html
/usr/share/doc/esound-common/html/x265.html
/usr/share/doc/esound-common/html/c19.html
/usr/share/doc/esound-common/html/x268.html
/usr/share/doc/esound-common/html/c271.html
/usr/share/doc/esound-common/html/x47.html
/usr/share/doc/esound-common/html/a346.html
/usr/share/doc/esound-common/html/x277.html
/usr/share/doc/esound-common/html/x211.html
/usr/share/doc/esound-common/html/c32.html
/usr/share/doc/esound-common/html/x281.html
/usr/share/doc/esound-common/html/c285.html
/usr/share/doc/esound-common/html/c290.html
/usr/share/doc/esound-common/README
/usr/share/doc/esound-common/NEWS.gz
/usr/share/doc/esound-common/README.Debian
/usr/share/doc/esound-common/AUTHORS
/usr/share/doc/esound-common/copyright
/usr/share/doc/esound-common/changelog.gz
/usr/share/doc/esound-common/changelog.Debian.gz
/usr/share/doc-base/esound
配置文件 /etc/esound/esd.conf 就是 ESD 的 daemon 启动的配置文件了，esd 参数不多，主要就是选择链接类型（-unix 还是 -tcp），指定端口 -port（默认是 5001），指定设备（-d），是否打开时候 beep（-nobeeps）等。可惜必须用 root 启动该进程。
clients 里面提供给我们一些命令，如 esdctl 用来控制 esd 的状态，esdrec 从 server 录下来一段，然后可以用 esdcat 发送给 ESD 播放，esdplay 相当于把一个已有的声音文件如 wav 从 ESD 播放，esdsample 允许播放的时候重采样，另外还有 esdloop 等不是很清楚实际作用。
那么如何使得本地的 mic 可以直接把声音播放到远程主机呢？一种想法就是利用管道，使用 arecord 或者 rec 等程序进行录制，通过管道送给 esdplay。可是实验发现 esdplay 不支持管道...
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