Here is a list of all documented files with brief descriptions:

build
include
libcamera
control_ids.h	Camera controls identifiers
formats.h
libcamera.h
property_ids.h	Camera properties identifiers
version.h
include
libcamera
base
bound_method.h	Method bind and invocation
flags.h	Enum-based bit fields
shared_fd.h	File descriptor wrapper
signal.h	Signal & slot implementation
unique_fd.h	File descriptor wrapper that owns a file descriptor
camera.h	Camera device handling
camera_manager.h	The camera manager
color_space.h	Class and enums to represent color spaces
controls.h	Framework to manage controls related to an object
fence.h	Definition of the Fence class
framebuffer.h	Frame buffer handling
framebuffer_allocator.h	FrameBuffer allocator
geometry.h	Data structures related to geometric objects
logging.h
orientation.h	Image orientation definition
pixel_format.h	Libcamera pixel format
request.h	Describes a frame capture request to be processed by a camera
stream.h	Video stream for a Camera
transform.h	Enum to represent and manipulate 2D plane transforms