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Video Sequence Editor

Code Layout

VSE code is split between "core" sequencer code and "editor" code.

Sequencer core is under source/blender/sequencer and handles rendering of strips, modifiers and effects, proxies, caching, prefetching, and implements the actual logic of sequencer operations.

Sequencer editor is under source/blender/editors/space_sequencer and implements sequencer preview and timeline area UIs, operators, drag & drop, etc.

Generally, code should try to not access (and especially modify) sequencer related DNA struct fields directly. Some of them have complex relationships with other fields, or their modifications should always be followed by some code to update caches or related data structures.