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{{NoteTA|G1=IT|G2=FL}}
{{Infobox software
| name = JACK Audio Connection Kit
| logo = [[File:LogoJack.png|250px]]
| screenshot = File:QjackctlConnectionsForm.png
| author = Paul Davis, Stéphane Letz
| developer = JACK團隊<ref>{{cite web |url=http://jackaudio.org/developers |title=JACK Developer Information |publisher=jackaudio.org |accessdate=2010-01-02 |deadurl=yes |archiveurl=https://web.archive.org/web/20100108064444/http://jackaudio.org/developers |archivedate=2010-01-08 }}</ref>
| released = 
| operating system = [[BSD]]、[[Linux]]、[[Mac OS X]]、[[Solaris]]、[[Microsoft Windows|Windows]]
| programming language = [[C语言|C]]<ref>{{cite web |url=http://www.ohloh.net/p/jack |title=Ohloh Analysis Summary - JACK |publisher=[[Ohloh]] |accessdate=2010-02-02 |archive-date=2012-06-06 |archive-url=https://www.webcitation.org/68DlwHASt?url=http://www.ohloh.net/p/jack |dead-url=no }}</ref>, [[C++]]
| genre = {{tsl|en|Sound server|Sound server}}
| license = [[GNU General Public License|GNU GPL]], [[GNU Lesser General Public License|GNU LGPL]]
| website = [http://jackaudio.org/ jackaudio.org]
}}

'''JACK''' （'''JACK Audio Connection Kit''' 的[[递归缩写]]）是一个专业级的[[声音服务]]（[[守护进程]]），它為声音和[[MIDI]]数据提供实时的、[[低延时]]的连接，有關的程式使用JACK的[[API]]。

它是由{{link-en|保羅·戴維斯 (程序員)|Paul Davis (programmer)|保羅·戴維斯}}（他凭着这项工作赢得了2004年的开源奖<ref>{{cite web |url=http://articles.techrepublic.com.com/5100-10878_11-5136755.html |title=Open Source Awards 2004: Paul Davis for JACK |publisher=techrepublic.com.com |accessdate=2010-02-16 |archiveurl=https://archive.today/20120701171907/http://www.techrepublic.com/article/open-source-awards-2004-paul-davis-for-jack/5136755 |archivedate=2012-07-01 |deadurl=yes }}</ref>）带领的一个[[开源]]社区开发。自从2002年初以来一直是[[Linux]]下的关键的基础设施和事实上的专业音频软件标准。这个服务是在[[GNU GPL]]协议下的[[开源软件]]，它的库則採用更宽松的[[GNU LGPL]]协议。

== 实现 ==
JACK 能使用[[ALSA]]、[[PortAudio]]、[[CoreAudio]]、[[FFADO]]和[[Open_Sound_System|OSS]]作为硬件层的后端。此外，还有一个虚拟的驱动（当不需要声音输出时是很有用的，例如离线渲染）和一个通过UDP协议的音频驱动（Audio-over-UDP driver）。它可以运行在[[Linux]]、 [[Mac OS X]]、 [[Solaris (作業系統)|Solaris]]、 [[Microsoft Windows|Windows]]、 [[FreeBSD]]、 [[OpenBSD]] 和 [[NetBSD]]上。JACK的API被标准化，并且存在两种可融合的实现：jack1，由简单的C实现并且已经维护了一段时间；至于jack2（原来的jackdmp），由Stéphane Letz领导的用C++重写的实现，jack2在积极开发中，目标是支持多处理器和对其它非Linux操作系统。<ref>{{cite web |url=http://lad.linuxaudio.org/events/2009_cdm/Thursday/01_Letz/index.html |title=What's new in JACK2? - Linux Audio Conference 2009 paper by primary JACK2 author Stephane Letz |publisher=linuxaudio.org |accessdate=2010-02-17 |archive-date=2010-03-17 |archive-url=https://web.archive.org/web/20100317034944/http://lad.linuxaudio.org/events/2009_cdm/Thursday/01_Letz/index.html |dead-url=no }}</ref>

== 低延时调度 ==
JACK为达到足够的低延时的调度要求是目前[[Linux内核|Linux 2.6 内核]]的实时操作系统优化的动力<ref>{{cite web |url=http://lkml.org/lkml/2004/7/9/138 |title=Original annoucement of a voluntary pre-emption patch for the Linux 2.6 kernel series by Ingo Molnar, 2004 |publisher=lkml.org |accessdate=2010-02-17 |archive-date=2016-08-18 |archive-url=https://web.archive.org/web/20160818042006/https://lkml.org/lkml/2004/7/9/138 |dead-url=no }}</ref><ref>{{cite web |url=http://lwn.net/images/conf/rtlws11/papers/proc/p02.pdf |title=Finding Origins of Latencies Using Ftrace, paper by Steven Rostedt from the Real-time Workshop 2009 |accessdate=2010-02-17 |archive-date=2012-10-21 |archive-url=https://web.archive.org/web/20121021165728/http://lwn.net/images/conf/rtlws11/papers/proc/p02.pdf |dead-url=no }}</ref>。Linux 2.6 内核最初的延时表现和老的2.4内核对比是让人失望的。<ref>{{cite web |url=http://lac.zkm.de/2006/papers/lac2006_lee_revell.pdf |title=Real-time audio vs. 2.6, Linux Audio Conference 2006 paper by Lee Revell |accessdate=2010-02-17 |archive-date=2020-11-10 |archive-url=https://web.archive.org/web/20201110045534/http://lac.zkm.de/2006/papers/lac2006_lee_revell.pdf |dead-url=no }}</ref>实时操作系统的调整工作已经在众多的对主线内核和一个对2.6.24版本的插入优化的 -rt分支中的调度调整中达到顶峰，最后成为一个<code>CONFIG_PREEMPT_RT</code>（配置优先）补丁。
<ref>{{cite web | url = http://rt.wiki.kernel.org/ | title = Real-Time Linux Wiki | publisher = [[kernel.org|Linux Kernel Organization]] | accessdate = 2010-06-08 | archive-date = 2012-02-06 | archive-url = https://web.archive.org/web/20120206044421/https://rt.wiki.kernel.org/ | dead-url = no }}</ref>

== 参见 ==
{{Portal|Free software}}
* [[Ardour (软件) | Ardour]]
* [[LADSPA]]
* [[PulseAudio]]
* [[aRts]]

==參考資料==
{{reflist|2}}

==外部連結==
* [http://jackaudio.org/ 官方网站]*{{Wayback|url=http://jackaudio.org/ |date=20110127062649 }}
* [http://www.linuxjournal.com/article/8354 Linux日志] {{Wayback|url=http://www.linuxjournal.com/article/8354 |date=20210130012423 }}
* [https://web.archive.org/web/20120606050919/http://www.grame.fr/~letz/jackdmp.html 连接到OSX和Windows二进制文件的Jackdmp]
* [http://apps.linuxaudio.org/apps/categories/jack 支持JACK的软件列表]{{Wayback|url=http://apps.linuxaudio.org/apps/categories/jack |date=20090327125326 }}
* [https://web.archive.org/web/20130614005531/http://w3.linux-magazine.com/issue/67/JACK_Audio_Server.pdf 其他关于JACK的文章 (只有PDF)]

[[Category:自由音訊軟體]]
[[Category:应用程序接口]]
[[Category:音乐软件插件体系结构]]
[[Category:字首缩写]]
[[Category:音訊函式庫]]

JACK Audio Connection Kit - 版本历史

imported>AromaTake：​使用HotCat已移除Category:音频库; 已添加Category:音訊函式庫

imported>AromaTake：使用HotCat已移除Category:音频库; 已添加Category:音訊函式庫