Modules
Here is a list of all modules:

Stream | PipeWire stream objects
Filter | PipeWire filter object class
Test Suite | `pwtest` is a test runner framework for PipeWire
JSON to POD | JSON to POD conversion
Core API | PipeWire Core API
Initialization | Initializing PipeWire and loading SPA modules
Main Loop | A main loop object
Context | The PipeWire context object manages all locally available resources
Client | Client interface
Core | The core global object
Device | Device interface
Factory | Factory interface
Link | A link is the connection between 2 nodes (Node)
Loop | PipeWire loop object provides an implementation of the spa loop interfaces
Module | Module interface
Node | Node interface
Permission | Permissions are kept for a client and describe what the client is allowed to do with an object
Port | Port interface
Proxy | Represents an object on the client side
Registry | The registry object is a singleton object that keeps track of global objects on the PipeWire instance
Type info | Type information
Key Names | A collection of keys that are used to add extra information on objects
Implementation API | PipeWire Object Implementation API
Client Impl | PipeWire client object class
Core Impl | PipeWire core interface
Device Impl | The device is an object that manages nodes
Factory Impl | The factory is used to make objects on demand
Link Impl | PipeWire link object
Metadata Impl | The metadata is used to store key/type/value pairs per object id
Module Impl | A dynamically loadable module
Node Impl | The node object processes data
Port Impl | A port can be used to link two nodes
Buffers | Buffer handling
Control | A control can be used to control a port property
Data Loop | PipeWire rt-loop object
Global | A global object visible to remote clients
Protocol | Manages protocols and their implementation
Resource | Client owned objects
Thread Loop | The threaded loop object runs a Loop in a separate thread and ensures proper locking is done
Work Queue | Queued processing of work items
Utilities | PipeWire Utilities
Array | An array object
Configuration | Loading/saving properties from/to configuration files
Internationalization | Gettext interface
Logging | Logging functions of PipeWire
Map | A map that holds pointers to objects indexed by id
Memory Blocks | Memory allocation and pools
Properties | Properties are used to pass around arbitrary key/value pairs
Thread | Functions to manipulate threads
Utilities | Various utility functions
Extensions | PipeWire Extensions
Client Node | Client node interface
Metadata | Metadata interface
Profiler | Profiler interface
Native Protocol | PipeWire native protocol interface
Session Manager | Session manager interface
SPA | Simple Plugin API
POD | Binary data serialization format
Buffers | Buffers describe the data and metadata that is exchanged between ports of a node
Control | Control type declarations
Debug | Debugging utilities
Device | The device interface can be used to monitor all kinds of devices and create objects as a result
Graph | Node graph
Node | A spa_node is a component that can consume and produce buffers
Parameters | Parameter value enumerations and type information
Utilities | Utility data structures, macros, etc
ANSI codes | ANSI color code macros
Miscellaneous | Helper macros and functions
Dictionary | Dictionary data structure
List | Doubly linked list data structure
Hooks | A SPA Hook is a data structure to keep track of callbacks
Interfaces | Generic implementation of implementation-independent interfaces
JSON | Relaxed JSON variant parsing
Key Names | Key names used by SPA plugins
Factory Names | SPA plugin factory names
Result handling | Asynchronous result utilities
Ringbuffer | Ring buffer implementation
String handling | String handling utilities
Types | Data type information enumerations
Support | Support interfaces provided by host
CPU | Querying CPU properties
DBus | DBus communication
I18N | Gettext interface
Log | Logging interface
Loop | Event loop interface
Plugin Handle | SPA plugin handle and factory interfaces
Plugin Loader | SPA plugin loader
System | I/O, clock, polling, timer, and signal interfaces
Thread | Threading utility interfaces