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Phase 7: Add MIDI clips, instrument and piano roll

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Johannes Findeisen 2026-10-27 00:53:41 +01:00
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@ -106,3 +106,15 @@ SPSC ring publishes complete payload blocks through lock-free indices. Only
the consumer writes WAV bytes; finalization follows successful callback stop.
No editable project pointer, GUI object or FILE is accessed by the producer.
See decision 0005 and AUDIO_FILES.md for format, limits and recovery contracts.
## Phase 7 MIDI source
The C MIDI plan prepares bounded source-relative notes into sample spans and
renders a separate instrument buffer. `xtc_plan_process_sources` and
`xtc_realtime_process_sources` distinguish external audio, WAV timeline and
instrument input; older wrappers supply silence for omitted sources. Graph
instrument nodes consume the shared mono instrument buffer. The backend owns
prepared MIDI runtime state exclusively while active, with lock-free panic
requests and no callback allocation/I/O. Stop/seek clear live voices; scheduled
notes chase their absolute phase. See MIDI.md for event ordering, panic semantics,
capacities and test coverage. No new dependency is required.