blocks|key|513827|text|来自多媒体后端上的Qt文档wiki：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|513828|以下是当前音频后端的列表：
Windows多媒体CoreAudio+(Mac+/+iOS)+PulseAudio+(Unix)+Alsa+(Unix)+OpenSL+ES+(Android)+QNX
只有PulseAudio、CoreAudio和QNX后端才是真正的插件。其他后端是相关类中的“#ifdef‘’ed”。|blockquote|513829|因此，ALSA基本上不是一个插件，但在配置Qt时必须进行选择(如果您构建了自己的插件，我假设您是这样做的)。|513830|来自于利用git构建Qt5上的Qt文档wiki|513831|Qt多媒体
您至少需要alsa-lib+(>=+1.0.15)和gstreamer+(>=0.10.24，但现在需要<1.0lists.qt-project.org)和基本插件包。
Ubuntu/Debian：
sudo+apt安装libasound2-dev+libgstreamer0.10-dev+libgstreamer+plugins-sudo+0.10-dev|513832|在配置Qt时，由于缺少依赖关系，在没有编译某些特性的情况下，我已经失去了计数。因此，绝对100%25确保所有依赖项都已正确安装，并且所有配置选项在当前的配置程序中都是有效的(可用选项甚至在小版本之间也会更改)！请记住仔细查看构建过程的输出(收集文件中的输出，并在生成完成后搜索它，以查找任何带有“跳过”或“错误”或类似关键字的消息。|513833|OTOH，如果你没有建立你自己的Qt，那么我不知道，你应该无视这个答案。|513834|entityMap|0|LINK|mutability|MUTABLE|url|http://qt-project.org/wiki/Qt_Multimedia_Backends|1|http://qt-project.org/wiki/Building_Qt_5_from_Git^0|2|5|0|0|0|0|3|A|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|C|$]]|$1|G|3|H|5|6|7|15|8|@]|9|@]|C|$]]|$1|I|3|J|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|K|3|L|5|F|7|1A|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|1B|8|@]|9|@]|C|$]]|$1|O|3|P|5|6|7|1C|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|Z]]]]

From Qt documentation wiki on <a href="http://qt-project.org/wiki/Qt_Multimedia_Backends" rel="nofollow">Multimedia Backends</a>: 

<blockquote>
 Here is the list of the current audio backends:

<pre><code>Windows Multimedia
CoreAudio (Mac OS / iOS)
PulseAudio (Unix)
Alsa (Unix)
OpenSL ES (Android)
QNX
</code></pre>
 
 Only PulseAudio, CoreAudio, and QNX backends are actual plugins. The
 other backends are “#ifdef’ed” in the related classes.
</blockquote>

So basically ALSA is not a plugin but must be selected when you configure Qt (if you build your own, which I assume you are).

From Qt documentation wiki on <a href="http://qt-project.org/wiki/Building_Qt_5_from_Git" rel="nofollow">building Qt5 from git</a>:

<blockquote>
 Qt Multimedia
 
 You’ll need at least alsa-lib (>= 1.0.15) and gstreamer (>=0.10.24,
 but &lt;1.0 for now [lists.qt-project.org]) with the base-plugins
 package.
 
 Ubuntu/Debian:

<pre><code>sudo apt-get install libasound2-dev libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev
</code></pre>
</blockquote>

When configuring Qt I have lost count over the times when some feature was not compiled in because of missing dependencies. So make absolutely 100% sure that all dependencies are installed properly, and that all your configuration options are valid with the current configuration program (available options change even between minor versions)! Remember to look closely at output from build process (collect output in a file and search through it after build completes for any messages with "skipping" or "error" or such keywords.

OTOH, if you did not build your own Qt then I have no clue and you should disregard this answer.

blocks|key|513871|text|修复在QT5.4中存在，提交eb75bf8e3bde3a9b3efc91b54aa4dc2e34a3cde4|type|unstyled|depth|inlineStyleRanges|entityRanges|data|513872|我是Qt的Debian维护人员，今天有一个用户遇到了同样的问题。构建日志显示，alsa依赖项存在，并且正在被正确检测.*-/|513873|注意，2014-12-03:问题在于plugins.pro:如果找到脉冲音频支持，它不会构建alsa插件。问题和补丁由克里斯鲁沃罗，将推动上游今天晚些时候。|513874|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Fix is present in Qt 5.4, commit eb75bf8e3bde3a9b3efc91b54aa4dc2e34a3cde4

<hr>

I'm the Debian maintainer for Qt and today a user came with the same problem. The build logs show that alsa dependencies are there and it's being properly detected... :-/

Note 2014-12-03: the problem lies in plugins.pro: it doesn't builds the alsa plugin if pulseaudio support is found. Problem and patch by Chris Ruvolo, will push upstream later today.

blocks|key|1869307|text|给你，后端|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1869308|​|1869309|📷|atomic|1869310|1869311|是的，我认为阿尔萨也支持。|1869312|entityMap|0|LINK|mutability|MUTABLE|url|https://wiki.qt.io/Qt_5.13_Multimedia_Backends|1|IMAGE|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/e3203fc025da4449c63d378f8d529c3d.png|imageAlt^0|3|2|0|0|0|0|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|D|3|E|5|6|7|13|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|I|3|E|5|6|7|18|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|19|8|@]|9|@]|C|$]]|$1|L|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]|T|$5|U|P|V|C|$W|X|Y|-4]]]]

Here, <a href="https://wiki.qt.io/Qt_5.13_Multimedia_Backends" rel="nofollow noreferrer">https://wiki.qt.io/Qt_5.13_Multimedia_Backends</a>
<a href="https://i.stack.imgur.com/hELCO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hELCO.png" alt="enter image description here" /></a>
Yes, I think Alsa also supports it.

I have a small C++ Qt program that uses a QAudioOutput instance to emit sound. It compiles &amp; runs fine using Qt 4.8.5.

However, in Qt 5.0, 5.1, and 5.2, my application compiles, but does not work. I get the following error message while the constructor of the QAudioOutput instance is running:

Unable to create a connection to the pulseaudio context.

Also, the constructor does not return, so my program hangs.

I do not have pulseaudio running. ALSA is working fine, and this is what my program uses when compiled with Qt 4.8.5.

Inspecting the Qt5 “plugins/audio” directory, there is only “libqtmedia_pulse.so” there, the name of which suggests that it depends on pulseaudio.

My questions:

<ul>
<li>Is there still a backend for output to ALSA (without pulseaudio) in Qt 5+ ?</li>
<li>If yes, how do I make sure it is built? I do not see any configure options for that.</li>
<li>It appears to be a bug that the constructor of QAudioOutput hangs my app. Where can I report that?</li>
</ul>

Is audio playback via ALSA supported in Qt5?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个小型的C++ Qt程序，它使用QAudioOutput实例发出声音。它使用QT4.8.5编译并运行良好。但是，在QT5.0、5.1和5.2中，我的应用程序编译，但不工作。在运行QAudioOutput实例的构造函数时，我得到以下错误消息：无法创建到脉冲音频上下文的连接。而且，构造函数不返回，所以我的程序挂起。我...

问在Qt5中是否支持通过ALSA播放音频？
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问在Qt5中是否支持通过ALSA播放音频？EN