Consolidated requirements for voice message audio queue

[turt2live]

These are developer notes

Issues:

• Auto play the next voice message in the timeline after one message has finished #18715
• Pause voice message playback when switching between rooms, and resume at the same point left off #18714
• Voice messages: Queue system for autoplay semantics #17961

Requirements for the system:

• Track where each event tile was left off at during playback
• Maintain an ordered set of voice messages (timeline order) to progress playback
• Maintain ordered set of actions (for A.5 -> B -> A -> C playback)

Product requirements:

• Navigating away from a room pauses playback (position remembered)
• Returning to a room and pressing play starts from where the user left off at before (which may be the start)
• When a voice message finishes playing, the next voice message starts playing
• If the user plays another voice message while another is playing, it pauses the current voice message and plays through.
  • This is "A.5 -> B -> A -> C" playback. In a case of 3 voice messages, ordered A, B, and C, the user can start playing A, interrupt it with B, and when B finishes the audio will return to A to play through, then to C to finish it off. If the user didn't interrupt anything then it'll be A -> B -> C.
• Should persist across restarts

System design: TBD

[kittykat]

I'm not a fan of potentially losing track of what is playing as it goes through messages. I think at the very least if there is a break in the audio messages, it should stop playback at the break. e.g.:

1. Voice
2. Voice
3. Text
4. Voice
5. Voice
6. Reply from OP
7. Voice

1 should be automatically followed by 2.
4 needs to be triggered again and is automatically followed by 5.
7 needs to be triggered again