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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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docs/AUDIO_ENGINE.md
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@ -238,3 +238,15 @@ I/O, logging, locks or FLTK calls were added. Backend stop failure preserves the
borrowed recorder; the caller must not free it before successful quiescence.
Live software source/capture acceptance and concurrent ring tests pass; physical
recording, latency compensation and disk endurance remain unverified.
## 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.