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Overview
xrdp supports audio redirection using PulseAudio, which is a sound system for POSIX operating systems. Server to client redirection is compliant to Remote Desktop Procol standard [MS-RDPEA] but client to server redirection implementation is proprietary. Accordingly, server to client redirection is available with many of RDP clients including Microsoft client but client to server redirection requires NeutrinoRDP client, not available with other clients.
Here is how to build pulseaudio modules for your distro, so you can have audio support through xrdp.
Prerequisites
Prepare xrdp source in your home directory. Of course, you can choose another directory.
cd ~
git clone https://github.com/neutrinolabs/xrdp.git
In this instruction, pulseaudio version is 10.0. Replace the version number in this instruction if your environment has different versions. You can find out your pulseaudio version executing the following command:
pulseaudio --version
How to build
Debian 9 / Ubuntu
This instruction also should be applicable to Ubuntu family.
Prerequisites
Some build tools and package development tools are required. Make sure install the tools.
apt install build-essential dpkg-dev
Prepare & build
Install pulseaudio and requisite packages to build pulseaudio.
apt install pulseaudio
apt build-dep pulseaudio
Fetch the pulseaudio source . You'll see pulseaudio-10.0 directory in your
current directory.
apt source pulseaudio
Enter into the directory and build the pulseaudio package.
cd pulseaudio-10.0
./configure
Finally, let's make. You'll have two .so files module-xrdp-sink.so and
module-xrdp-source.so.
cd ~/xrdp/sesman/chansrv/pulse
make PULSE_DIR="~/pulseaudio-10.0"
Other distro
First off, find out your pulseaudio version using pulseaudio --version
command. Download the tarball of the pulseaudio version that you have.
After downloading the tarball, extact the tarball and cd into the source
directory, then run ./configure.
wget https://freedesktop.org/software/pulseaudio/releases/pulseaudio-10.0.tar.xz
tar xf pulseaudio-10.0.tar.gz
cd pulseaudio-10.0
./configure
If additional packages are required to run ./configure, install requisite
packages depending on your environment.
Finally, let's make. You'll have two .so files module-xrdp-sink.so and
module-xrdp-source.so.
cd ~/xrdp/sesman/chansrv/pulse
make PULSE_DIR="~/pulseaudio-10.0"
Install
Install process is not distro specific except for install destination. Install
built two .so files into the pulseaudio modules directory. Typically,
/usr/lib/pulse-10.0/modules for Debian, /usr/lib64/pulse-10.0/modules for
CentOS 7. Other distro might have different path. Find out the right path for
your distro.
Look into the directory with ls command. You'll see lots of module-*.so
files. There's the place!
cd ~/xrdp/sesman/chansrv/pulse
for f in *.so; do install -s -m 644 $f /usr/lib/pulse-10.0/modules; done
This command is equivalent to following:
install -s -m 644 module-xrdp-sink.so /usr/lib/pulse-10.0/modules
install -s -m 644 module-xrdp-source.so /usr/lib/pulse-10.0/modules
Well done! Pulseaudio modules should be properly built and installed.
See if it works
To see if it works, run pavumeter in the xrdp session. Playback any YouTube
video in Firefox. You'll see "Showing signal levels of xrdp sink" and
volume meter moving.