Mimir/docs/implementation-plan.md

Implementation Plan

Implemented

• Repo-local persistence machinery.
• First architecture map.
• Example config for one video source plus two audio sources.
• Sender device discovery script.
• Sender launch script with dry-run mode and per-source FFmpeg commands.
• OBS receiver setup notes.
• Neighbor sender deployment under C:\Meta\LocalCastBridge.
• Madman's desktop start/stop launchers for the sender.
• Receiver OBS scene has Neighbor PC - Video and Neighbor PC - Focusrite Media Sources.
• Voicemeeter loopback installed on the sender.
• Receiver OBS scene has Neighbor PC - System Audio on SRT port 5102.
• Sender script uses -nostdin and repo-root logs so desktop launchers stay alive and diagnostics land in C:\Meta\LocalCastBridge\logs.
• Sender video config is 1920x1080 for the interactive desktop. The 1024x768 SSH session size is not the streaming target.
• Desktop .cmd launchers delegate to PowerShell wrappers so paths with spaces and apostrophes are handled in one place.
• Audio-field sidecar profile and tool:
  • config/audio-field.example.json declares the actual distributed six-mic rig: two Kiyo mics, two PS Eye mics, local Focusrite shielded cardioid, neighbor Focusrite shotgun on the co-streamer, two local speakers, placeholder geometry, clock domains, capture policy, calibration sweep settings, and FOA AmbiX ACN/SN3D output.
  • scripts/audio_field.py lists devices, validates shared or distributed profiles, checks local distributed sources, generates calibration sweeps, summarizes clock-domain sync requirements, preserves shared-input capture helpers, and encodes already aligned offline WAVs to FOA.
  • audio_field/ contains testable core modules for source buffering, bounded latency convergence, injectable capture/alignment/encoder/sink ports, and pipeline orchestration.
  • docs/audio-field.md maps the audio pipeline and its invariants.

Temporary

• Audio and video are separate SRT endpoints. This preserves OBS mixing authority but may need latency tuning.
• Audio defaults to AAC inside MPEG-TS for compatibility; test Opus later only if there is a concrete reason.
• Desktop capture uses gdigrab first because it is broadly available. ddagrab is a candidate once the installed FFmpeg build is confirmed.
• The scripts assume Windows sender and OBS receiver on the same LAN.

Next

1. Open OBS and confirm the three Neighbor PC sources load.
2. Start the sender from Madman's interactive desktop, not SSH.
3. Smoke-test the video endpoint in OBS.
4. Smoke-test the Focusrite endpoint in OBS.
5. Smoke-test the system-loopback endpoint in OBS.
6. Tune SRT latency and FFmpeg buffering for the local network.
7. Decide whether a small OBS scene/source generator is worth adding.
8. Reconsider plugin/fork only if standard OBS Media Source cannot preserve the required behavior.
9. Create local config/audio-field.json, confirm local Kiyo/PS Eye/Focusrite device matches, and confirm the neighbor Focusrite shotgun capture/transport path.
10. Replace placeholder mic/speaker geometry with measured world coordinates, then build the delay/SRO alignment stage that feeds the bounded field cache and emits aligned six-channel blocks before FOA encoding.