WIP.

test/pulseaudio/Dockerfile

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+FROM debian:bullseye-slim
+
+#
+# set custom user
+ARG USERNAME=neko
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+#
+# install dependencies
+RUN set -eux; apt-get update; \
+    apt-get install -y --no-install-recommends pulseaudio; \
+    #
+    # create a non-root user
+    groupadd --gid $USER_GID $USERNAME; \
+    useradd --uid $USER_UID --gid $USERNAME --shell /bin/bash --create-home $USERNAME; \
+    #
+    # make directories
+    mkdir -p /home/$USERNAME/.config/pulse; \
+    chown -R $USERNAME:$USERNAME /home/$USERNAME; \
+    #
+    # clean up
+    apt-get clean -y; \
+    rm -rf /var/lib/apt/lists/* /var/cache/apt/*
+
+#
+# set default envs
+ENV USER=$USERNAME
+
+#
+# copy configuation files
+COPY default.pa /etc/pulse/default.pa
+
+USER $USERNAME
+
+ENTRYPOINT [ "/usr/bin/pulseaudio" ]
+
+CMD [ "--log-level=info", "--disallow-module-loading", "--disallow-exit", "--exit-idle-time=-1" ]

test/pulseaudio/default.pa

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+#!/usr/bin/pulseaudio -nF
+
+### Create virtual output device sink
+load-module module-null-sink sink_name=audio_output sink_properties=device.description="Virtual\ Audio\ Output"
+
+# Allow pulse audio to be accessed via TCP (from localhost only), to allow other users to access the virtual devices
+load-module module-native-protocol-tcp port=4713 auth-anonymous=1
+
+### Make sure we always have a sink around, even if it is a null sink.
+load-module module-always-sink