使用鳄梨酱VNC在tcp上为多个用户提供Pulseaudio声音流

Ubuntu 14.04。我让PulseAudio作为守护进程运行，并配置为进行流式处理。在

/etc/pulse/default.pa

中，我添加了以下内容以接受TCP连接：

load-module module-native-protocol-tcp auth-ip-acl=192.168.1.0/24 auth-anonymous=1

Guacamole的VNC支持通过连接到PulseAudio服务器获得音频。请参阅有关的文章。 尽管在

/etc/guacamole/user mapping.xml

中启用了多个VNC连接（这些是不同的连接），但我可以从一个VNC桌面获得声音流，但不能超过一个。例如：

<!-- First user -->
<authorize username="user1" password="abcd">
    <connection name="vnc">
        <protocol>vnc</protocol>
        <param name="hostname">localhost</param>
        <param name="port">5903</param>
        <param name="password">abcd</param>
        <param name="enable-audio">true</param>
        <param name="audio-servername">localhost</param>
    </connection>
</authorize>

<!-- Second user -->
<authorize username="user2" password="abcd">
    <!-- First authorized connection -->
    <connection name="vnc">
        <protocol>vnc</protocol>
        <param name="hostname">localhost</param>
        <param name="port">5904</param>
        <param name="password">abcd</param>
        <param name="enable-audio">true</param>
        <param name="audio-servername">localhost</param>
    </connection>
</authorize>

PulseAudio是否处理多个鳄梨酱VNC用户

由于Guacamole记录到/var/log/syslog，我已经隔离了两个连接实例的日志。这些是日志

第一个连接是名为guacamole_guest的用户，它没有声音

Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Protocol "vnc" selected
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Connection ID is "$299e5678-59de-4dbd-9408-ad256785f732"
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: VNC server supports protocol version 3.8 (viewer 3.8)
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: We have 2 security types to read
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: 0) Received security type 2
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Selecting security type 2 (0/2 in the list)
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: 1) Received security type 16
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Selected Security Scheme 2
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: VNC authentication succeeded
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Desktop name "guacamole_guest's X desktop (lubuntu-ThinkCentre-M58p:3)"
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Connected to VNC server, using protocol version 3.8
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: VNC server default format:
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]:   32 bits per pixel.
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]:   Least significant byte first in each pixel.
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]:   TRUE colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Audio will be encoded as audio/ogg
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Starting audio stream
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Connecting to PulseAudio...
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Starting client
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Authorizing PulseAudio connection...
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Sending client name...
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: PulseAudio now ready
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Will use default sink: "auto_null"
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: Starting streaming from "Dummy Output"
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: PulseAudio stream being created...
Oct 23 02:31:23 lubuntu-ThinkCentre-M58p guacd[18848]: PulseAudio stream now ready
Oct 23 02:31:33 lubuntu-ThinkCentre-M58p guacd[18848]: Client disconnected
Oct 23 02:31:33 lubuntu-ThinkCentre-M58p guacd[18848]: Audio stream finished
Oct 23 02:31:33 lubuntu-ThinkCentre-M58p kernel: [1207939.582306] guacd[18848]: segfault at 67452305 ip b6b7ce15 sp bfd99cc0 error 4 in libguac-client-vnc.so.0.0.0[b6b73000+e000]

第二个用户称为lubuntu。它有声音

Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Protocol "vnc" selected
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Connection ID is "$6344d2fb-c5fe-4073-82d7-88dea358b8f6"
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: VNC server supports protocol version 3.8 (viewer 3.8)
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: We have 2 security types to read
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: 0) Received security type 2
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Selecting security type 2 (0/2 in the list)
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: 1) Received security type 16
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Selected Security Scheme 2
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: VNC authentication succeeded
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Desktop name "lubuntu's X desktop (lubuntu-ThinkCentre-M58p:2)"
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Connected to VNC server, using protocol version 3.8
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: VNC server default format:
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]:   32 bits per pixel.
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]:   Least significant byte first in each pixel.
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]:   TRUE colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Audio will be encoded as audio/ogg
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Starting audio stream
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Connecting to PulseAudio...
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Authorizing PulseAudio connection...
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Sending client name...
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Starting client
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: PulseAudio now ready
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Will use default sink: "auto_null"
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Starting streaming from "Dummy Output"
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: PulseAudio stream being created...
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: PulseAudio stream now ready
Oct 23 02:31:43 lubuntu-ThinkCentre-M58p guacd[18871]: Client disconnected
Oct 23 02:31:43 lubuntu-ThinkCentre-M58p guacd[18871]: Audio stream finished
Oct 23 02:31:43 lubuntu-ThinkCentre-M58p kernel: [1207949.566374] guacd[18871]: segfault at 67452305 ip b6b7ce15 sp bfd99cc0 error 4 in libguac-client-vnc.so.0.0.0[b6b73000+e000]

从表面上看，他们看起来是一样的。我不知道该去哪里。SegFault看起来不太好，但在这两种情况下都会发生

PulseAudio是否处理多个鳄梨酱VNC用户

PulseAudio不会知道鳄梨酱的VNC连接。鳄梨酱将把来自PulseAudio的音频流与来自VNC的图形流结合起来，但VNC和PulseAudio连接在其他方面是完全独立的

鳄梨酱可以为不同的用户/连接处理PulseAudio流，但这些流必须来自不同的主机。这是因为当代表VNC连接连接到PulseAudio时，鳄梨酱将执行以下操作：

建立到PulseAudio服务器的TCP连接，如

audio servername

所述

在默认接收器周围创建一个监视器源，并对接收到的音频数据包进行流式传输

由于位于

localhost

的PulseAudio服务器在两个连接中都是相同的PulseAudio服务器，并且只有一个默认接收器，因此在这两种情况下，您将听到来自同一接收器的音频

第一个连接是一个名为guacamole_guest的用户，它没有声音。。。第二个用户称为lubuntu。它有声音

Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Protocol "vnc" selected
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Connection ID is "$6344d2fb-c5fe-4073-82d7-88dea358b8f6"
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: VNC server supports protocol version 3.8 (viewer 3.8)
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: We have 2 security types to read
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: 0) Received security type 2
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Selecting security type 2 (0/2 in the list)
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: 1) Received security type 16
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Selected Security Scheme 2
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: VNC authentication succeeded
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Desktop name "lubuntu's X desktop (lubuntu-ThinkCentre-M58p:2)"
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Connected to VNC server, using protocol version 3.8
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: VNC server default format:
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]:   32 bits per pixel.
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]:   Least significant byte first in each pixel.
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]:   TRUE colour: max red 255 green 255 blue 255, shift red 16 green 8 blue 0
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Audio will be encoded as audio/ogg
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Starting audio stream
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Connecting to PulseAudio...
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Authorizing PulseAudio connection...
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Sending client name...
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Starting client
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: PulseAudio now ready
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Will use default sink: "auto_null"
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: Starting streaming from "Dummy Output"
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: PulseAudio stream being created...
Oct 23 02:31:37 lubuntu-ThinkCentre-M58p guacd[18871]: PulseAudio stream now ready
Oct 23 02:31:43 lubuntu-ThinkCentre-M58p guacd[18871]: Client disconnected
Oct 23 02:31:43 lubuntu-ThinkCentre-M58p guacd[18871]: Audio stream finished
Oct 23 02:31:43 lubuntu-ThinkCentre-M58p kernel: [1207949.566374] guacd[18871]: segfault at 67452305 ip b6b7ce15 sp bfd99cc0 error 4 in libguac-client-vnc.so.0.0.0[b6b73000+e000]

有趣的是，您只在一个连接中听到音频的事实可能与音频在PulseAudio中的路由方式有关。我相信这是有原因的，但找出原因并不能解决你的问题。与您的两个VNC连接关联的两个PulseAudio连接保证在您的情况下相同

如果您希望在同一硬件上托管多个用户的桌面，我建议您使用VirtualBox或KVM之类的工具将每个用户的桌面放在虚拟机中。这将为用户之间提供更好的隔离，并为相应的PulseAudio服务器提供唯一的网络地址

SegFault看起来不太好，但在这两种情况下都会发生

事实上，番石榴绝对不应该有缺陷。如果您能够可靠地复制segfault，那么最好的办法就是为项目生成一个bug报告。在segfault的情况下，执行此操作的说明有些复杂，但有必要确定segfault发生的位置和方式：

确保guacd是死的（这样我们可以在调试器下再次启动它）

在gdb下加载guacd，为失败的协议预加载插件

$ LD_PRELOAD=/usr/local/lib/libguac-client-vnc.so gdb /usr/local/sbin/guacd
GNU gdb (GDB) 7.4.1-debian
Copyright (C) 2012 Free Software Foundation, Inc.
...
(gdb)

告诉gdb遵循下一个子进程（guacd创建一个新的子进程来隔离和处理每个新连接）

在gdb中运行guacd，使用

-L debug

在guacd中启用调试级别日志记录

(gdb) run -L debug
Starting program: /usr/local/sbin/guacd 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
guacd[29589]: INFO:     Guacamole proxy daemon (guacd) version 0.9.8 started
guacd[29589]: DEBUG:    Unable to bind socket to host ::1, port 4822: Address family not supported by protocol
guacd[29589]: DEBUG:    Successfully bound socket to host 127.0.0.1, port 4822
guacd[29589]: INFO:     Listening on host 127.0.0.1, port 4822
...

重现问题。一旦发生，您将返回到gdb提示符。从gdb获取回溯跟踪：

(gdb) bt

发送结果回溯以及如何在中的新问题中重现问题的说明

(gdb) run -L debug
Starting program: /usr/local/sbin/guacd 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
guacd[29589]: INFO:     Guacamole proxy daemon (guacd) version 0.9.8 started
guacd[29589]: DEBUG:    Unable to bind socket to host ::1, port 4822: Address family not supported by protocol
guacd[29589]: DEBUG:    Successfully bound socket to host 127.0.0.1, port 4822
guacd[29589]: INFO:     Listening on host 127.0.0.1, port 4822
...

(gdb) bt