Provides an abstraction over Canon's internal state machine for LiveView, movie recording, and other modes. It hooks into state transitions using a generic spy mechanism (`stateobj_start_spy`, `stateobj_lv_spy`) that can be run before or after transitions. This component is self-contained, requires only a few platform-specific hooks defined in `state-object.h`, and can be extracted to synchronize application logic with a third-party state machine in embedded systems.

Implements a clean abstraction over Canon's EDMAC DMA engine, including register base address retrieval, channel management, and transfer size calculations. It handles multiple DMA channel types with separate read/write ports. The code is well-documented with register bitfields and is isolated from camera-specific logic, making it reusable as a DMA driver layer for any hardware with a similar channel-based DMA controller.

Provides a priority-ordered, semaphore-protected callback registration system. Callbacks are stored in an arena-allocated table with fixed slots, supporting add/remove and notification with a priority value. The design is compact, thread-safe (uses DryOS semaphores), and could be extracted as a generic callback or event handler framework for embedded real-time systems.

Contains optimized routines for YUV422 to RGB conversion (with optional scaling) and vice versa. The code handles various packed and planar formats, applies dithering, and uses integer arithmetic for performance. It is self-contained with no dependencies beyond standard types and headers, making it directly reusable as a standalone image format conversion library.