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  1. What are out critical outcomes ?
  2. What are the most critical areas to document ?
  3. Discussion on Architecture and Requirements
  4. Timelines / Milestones ?
  5. What needs to be ported, who and when ?

Notes during the meeting:

  • Topics to discuss:
    • Architecture discussion
      • specialized HW
      • special controls
      • Sound from remote devices
        • tcp/ip
        • can connect

Architecture Diagram to start with:

session manager able to configure dsp?

  one client per each ALSA device in case of hardware mixing

   open/ proprietary networkmanager separate!

  external (zephyr/autosar) devices reserve/create ressource

  Gateway/Portal handling ressource/ACL management. Returning ressource URI  (socket or network endpoint)  ?

George: original idea is to create and configure the pipewire socket; more discussion needed

Potentially desired mechanism for content protection:


1) client connects using (no / invalid) token

2) service reacts with refusal and ID/Link to authority

3) client connects to authority

4) authority grants token

5) client connects to service w/ new token

6) service checks token with authority

7) authority verifies token

8) access granted

→ similar / equal to oauth/openID mechanism

Summary #1:

  • In a car we have (proprietary) network managers. The pipewire session manager needs to communicate with these and provide an API.
    • Similar for copy protection mechanisms.
    • Thus session manager cannot (shouldn't try) to abstract all of these.
    • System management might be on external hardware
  • Security provided by a gateway/portal that handles ressource managment and authoriztion.
    • Need to take HDCP/content protection in mind (e.g. widevine)

TODO: Session Manager first.


  • static and/or default config   vs dynamic configuration  at runtime
  • handle device removal
  • graph inplemented in HW level
  • kernel-based security
  • content protection
  • role of the gateway
  • external authority ?

  nodes appearing inside pipewire, representing the devices and the clients

  client connected to alsa device through DSP and using a filter plugin in the middle

  gateway in session manager ?

  hardware device graph, somewhere else in the car

  wireplumber internal design

Talking points for WED:

  • API's
  • configuration
  • gateway&security
  • pipewire specific issues
  • bluetooth
  • device↔device streams  (e.g. KF radio)
  • capture, capture mixing, wakeword processing,

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