22 lines
1.5 KiB
Markdown
22 lines
1.5 KiB
Markdown
# Architecture
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`core/midi.ts` turns a bounded SMF byte stream into inert tracks and absolute-tick events. Chunk boundaries, four-byte VLQs, running status, event counts, SysEx size, PPQN division and known fixed-length meta events are validated before data is exposed. Editing functions clone this model and preserve stable event ordering.
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`Workbench.tsx` keeps the last valid document during failed imports or
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operations. Parsing, transforms and exports execute through a disposable module
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worker; progress messages are revision-scoped, cancellation terminates the
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worker and late messages cannot replace newer state. A no-Worker fallback exists
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for test and older-browser resilience, while the shipped browser path stays
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off-main. The SVG piano roll renders at most 5,000 notes. Playback maps ticks
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through the tempo map, creates fixed application-owned sine oscillators and can
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stop immediately by closing the active `AudioContext`; imported bytes never
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become code or remote references.
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Paired notes can be selected in the SVG piano roll and edited through the same
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worker protocol as bulk transforms. Web MIDI access is requested only after an
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explicit click, without SysEx permission; scheduled output is bounded and Stop
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sends all-notes-off on every channel. The local SoundFont inspector validates
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RIFF `sfbk` structure and reports INFO/pdta counts but does not render the bank.
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All Vite assets use relative paths for nested portal mounting. Release packaging fixes ZIP ordering, timestamps and permissions.
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