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docs(openspec): define phase 3d native macos client

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sechmachine
2026-08-10 22:52:39 +07:00
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openspec/changes/phase-3d-macos-native-mvp/specs/macos-media-presentation/spec.md
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## ADDED Requirements
### Requirement: P3D-014 hardware video presentation
Video SHALL use negotiated registered media identifiers, VideoToolbox hardware decode, and Metal presentation without unnecessary copies or persistence.
#### Scenario: Unsupported hardware decode
- **WHEN** the negotiated profile cannot be decoded by supported VideoToolbox hardware
- **THEN** the session fails explicitly without software fallback, remote transcode, or pixel logging
### Requirement: P3D-015 bounded audio playback
Audio SHALL use a proven CoreAudio abstraction with bounded buffering, negotiated channel layout, drift handling, and measurable A/V synchronization.
#### Scenario: Audio device replacement
- **WHEN** the default audio device changes or disappears during an active session
- **THEN** bounded playback state is recreated or fails visibly without persisting streamed audio