start pulseaudio in standalone mode

[edhinard]

User description

Description

In addition to #994 . this PR starts pulseaudio in standalone mode.

Motivation and Context

Feature added by #994 was available for grid mode only.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
  I don't think this audio feature is documented. I found it by accident. Where should it be described?
• I have added tests to cover my changes.
  Support for browsers to play video streams #994 added a new test (test_play_video) that is not working anymore since video link is broken. Not sure how to repair it

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Type

enhancement

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Description

• Added initialization and configuration of PulseAudio in the standalone startup script to ensure audio functionality.
• This includes starting the PulseAudio server, setting up a virtual sink, and configuring the default sink and source.

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Changes walkthrough

	Relevant files
Enhancement	start-selenium-standalone.sh Configure PulseAudio for Standalone Selenium Mode                Standalone/start-selenium-standalone.sh Added commands to start the pulseaudio server in standalone mode. Configured a virtual sink and set it as the default sink. Set the monitor of the virtual sink as the default source. +10/-0

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[CLAassistant]

All committers have signed the CLA.

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PR Description updated to latest commit (aa52551)

• Copy walkthrough table to "Files Changed" Tab

[codiumai-pr-agent-pro]

PR Review

⏱️ Estimated effort to review [1-5]	2, because the changes are straightforward and localized to a single script. The modifications involve starting a service and configuring it, which is typically not complex. However, understanding the context and implications of these changes in the system might require some domain knowledge about audio services in Selenium environments.
🧪 Relevant tests	No
🔍 Possible issues	Possible Bug: The script does not handle the failure of any PulseAudio commands. If any command fails (e.g., PulseAudio fails to start or a module fails to load), the script will continue executing. This could lead to hard-to-diagnose errors at runtime.
🔒 Security concerns	No

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PR Code Suggestions

Category	Suggestions
Enhancement	Prevent multiple instances of pulseaudio by checking if it's already running before starting it. Consider checking if pulseaudio is already running before attempting to start it. This can prevent multiple instances which might lead to unexpected behavior. Standalone/start-selenium-standalone.sh [6] -pulseaudio -D --exit-idle-time=-1 +if ! pgrep -x "pulseaudio" > /dev/null +then + pulseaudio -D --exit-idle-time=-1 +fi
Best practice	Add error handling to pacmd commands to ensure successful execution. Add error handling for pacmd commands to ensure each command succeeds before proceeding to the next. This can be done by checking the exit status of each command. Standalone/start-selenium-standalone.sh [9-13] -pacmd load-module module-virtual-sink sink_name=v1 -pacmd set-default-sink v1 -pacmd set-default-source v1.monitor +if ! pacmd load-module module-virtual-sink sink_name=v1; then + echo "Failed to load virtual sink module" + exit 1 +fi +if ! pacmd set-default-sink v1; then + echo "Failed to set default sink" + exit 1 +fi +if ! pacmd set-default-source v1.monitor; then + echo "Failed to set default source" + exit 1 +fi
	Use a variable for the sink name to simplify modifications and increase flexibility. To avoid potential issues with hardcoded sink names, consider using a variable for the sink name, making it easier to modify or configure. Standalone/start-selenium-standalone.sh [9-13] -pacmd load-module module-virtual-sink sink_name=v1 -pacmd set-default-sink v1 -pacmd set-default-source v1.monitor +SINK_NAME="v1" +pacmd load-module module-virtual-sink sink_name=$SINK_NAME +pacmd set-default-sink $SINK_NAME +pacmd set-default-source $SINK_NAME.monitor
Security	Ensure the script is run with root privileges for necessary permissions. Consider adding a check to ensure the script is run with root privileges, as pulseaudio and pacmd might require elevated permissions. Standalone/start-selenium-standalone.sh [6] +if [ "$(id -u)" != "0" ]; then + echo "This script must be run as root" >&2 + exit 1 +fi pulseaudio -D --exit-idle-time=-1
Maintainability	Centralize pacmd command handling in a function to improve maintainability. To improve maintainability, consider creating a function to handle pacmd operations, reducing code duplication and centralizing command handling. Standalone/start-selenium-standalone.sh [9-13] -pacmd load-module module-virtual-sink sink_name=v1 -pacmd set-default-sink v1 -pacmd set-default-source v1.monitor +function pacmd_handle() { + if ! pacmd "$@"; then + echo "Command failed: pacmd $*" + exit 1 + fi +} +pacmd_handle load-module module-virtual-sink sink_name=v1 +pacmd_handle set-default-sink v1 +pacmd_handle set-default-source v1.monitor

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[VietND96]

We will merge this PR after few CI tests are fixed

[VietND96]

Thank you, @edhinard !

[edhinard]

thanks to you and your great job