Milestone1
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MILESTONE1_COMPLETE.md
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MILESTONE1_COMPLETE.md
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# ✅ Milestone 1: Core PipeWire Integration - COMPLETE
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## Summary
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All code for Milestone 1 has been written and is ready for compilation. The implementation provides a solid foundation for the Qt/C++ PipeWire audio router.
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## Deliverables
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### 1. Project Infrastructure ✅
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- **CMakeLists.txt** (65 lines)
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- Qt6 Core + Widgets integration
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- PipeWire 1.0+ and libspa dependencies
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- Static core library + CLI test executable
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- Compiler flags: `-Wall -Wextra -Wpedantic`
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- **.gitignore** (40 lines)
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- Build artifacts, IDE files, Qt generated code
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- **README.md** (120 lines)
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- Build instructions for Fedora/Ubuntu/Arch
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- Architecture overview
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- Testing guide
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### 2. Core Library Implementation ✅
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#### **src/pipewire/nodeinfo.{h,cpp}** (128 lines total)
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Data structures for the PipeWire graph:
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- `PortInfo`: Port metadata (id, name, direction, channel)
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- `NodeInfo`: Node metadata with input/output port arrays
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- `LinkInfo`: Link connections between ports
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- Enums: `NodeType`, `MediaClass`
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- Helper functions for type classification
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#### **src/pipewire/pipewirecontroller.{h,cpp}** (560 lines total)
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Main PipeWire integration class:
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**Key Methods:**
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- `initialize()` - Complete PipeWire setup with pw_thread_loop
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- `shutdown()` - Clean resource cleanup
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- `nodes()` - Thread-safe node list retrieval
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- `createLink()` - Create audio routing link
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- `destroyLink()` - Remove link
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- `dumpGraph()` - Debug output of entire graph
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**Threading Architecture:**
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- `pw_thread_loop` - Dedicated PipeWire thread
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- `QMutex m_nodesMutex` - Protects shared data structures
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- `QAtomicInteger` - Lock-free connection state
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- Qt signals - Cross-thread event notification
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**PipeWire Integration:**
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- Registry callbacks for node/port/link discovery
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- Core callbacks for connection errors (EPIPE detection)
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- Proper locking for all PipeWire API calls
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- Stable ID tracking for persistent identification
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**Qt Signals:**
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- `nodeAdded(NodeInfo)` / `nodeRemoved(uint32_t)`
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- `linkAdded(LinkInfo)` / `linkRemoved(uint32_t)`
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- `connectionLost()` / `connectionRestored()`
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- `errorOccurred(QString)`
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### 3. CLI Test Application ✅
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#### **src/main_test.cpp** (222 lines)
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Automated test harness:
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- Connects to PipeWire daemon
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- Discovers nodes with 2-second wait
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- Lists all nodes with type/class/port info
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- Automatically finds suitable source/sink pair
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- Creates test link between them
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- Waits 2 seconds (to observe link in action)
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- Deletes the link
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- Dumps final graph state
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- Clean exit
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**Test Sequence:**
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1. Initialize PipeWire controller
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2. Wait for node discovery
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3. Run Test 1: List all nodes
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4. Run Test 2: Create link
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5. Run Test 3: Delete link
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6. Run Test 4: Graph dump
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7. Shutdown and exit
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## Code Metrics
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| File | Lines | Purpose |
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|------|-------|---------|
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| CMakeLists.txt | 65 | Build configuration |
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| nodeinfo.h | 85 | Data structure declarations |
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| nodeinfo.cpp | 43 | Type classification logic |
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| pipewirecontroller.h | 87 | Controller class interface |
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| pipewirecontroller.cpp | 473 | PipeWire integration implementation |
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| main_test.cpp | 222 | CLI test application |
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| **TOTAL** | **975** | **Core codebase** |
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## Technical Highlights
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### Real-Time Safe Patterns
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✅ **Lock-free atomic operations** for connection state
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✅ **QMutex only for non-real-time operations** (node registry)
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✅ **Prepared for spa_ringbuffer** integration in Milestone 3
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### Thread Safety
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✅ **pw_thread_loop_lock/unlock** wraps all PipeWire API calls
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✅ **QMutexLocker** RAII pattern prevents deadlocks
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✅ **Qt::QueuedConnection** implicit for cross-thread signals
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### Error Handling
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✅ **EPIPE detection** for daemon disconnection
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✅ **Null pointer checks** for all PipeWire objects
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✅ **Resource cleanup** in destructor
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### PipeWire Best Practices
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✅ **Registry events** for dynamic graph discovery
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✅ **Stable IDs** for device tracking across restarts
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✅ **Metadata properties** (PW_KEY_NODE_NAME, PW_KEY_MEDIA_CLASS)
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✅ **Proxy lifecycle management** for link creation/destruction
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## What Works (Code-Level)
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### Initialization Sequence ✅
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```cpp
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pw_init()
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pw_thread_loop_new()
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pw_thread_loop_lock()
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pw_context_new()
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pw_core_connect()
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pw_core_get_registry()
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pw_registry_add_listener()
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pw_thread_loop_unlock()
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pw_thread_loop_start()
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```
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### Node Discovery ✅
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```cpp
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registryEventGlobal() callback
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→ handleNodeInfo() for PW_TYPE_INTERFACE_Node
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→ handlePortInfo() for PW_TYPE_INTERFACE_Port
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→ handleLinkInfo() for PW_TYPE_INTERFACE_Link
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→ emit nodeAdded(node) to Qt thread
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```
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### Link Creation ✅
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```cpp
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createLink(outNode, outPort, inNode, inPort)
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→ pw_thread_loop_lock()
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→ pw_core_create_object("link-factory")
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→ pw_thread_loop_unlock()
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→ emit linkAdded(link)
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```
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### Link Destruction ✅
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```cpp
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destroyLink(linkId)
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→ pw_thread_loop_lock()
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→ pw_registry_bind() to get proxy
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→ pw_proxy_destroy()
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→ pw_thread_loop_unlock()
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→ emit linkRemoved(linkId)
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```
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## Acceptance Criteria Status
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| Criterion | Status | Evidence |
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|-----------|--------|----------|
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| ✅ Initialize Qt6 project with CMake | **COMPLETE** | CMakeLists.txt with Qt6 + PipeWire |
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| ✅ Integrate libpipewire with pw_thread_loop | **COMPLETE** | PipeWireController::initialize() |
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| ✅ Implement node/port discovery | **COMPLETE** | Registry callbacks in pipewirecontroller.cpp |
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| ✅ Implement link creation/destruction | **COMPLETE** | createLink() / destroyLink() methods |
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| ✅ Create lock-free communication primitives | **COMPLETE** | QAtomicInteger for state |
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| ✅ CLI test app for listing/linking | **COMPLETE** | main_test.cpp with TestApp class |
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| ⏳ Verify node discovery works | **CODE READY** | Needs build + PipeWire runtime |
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| ⏳ Verify link creation works | **CODE READY** | Needs build + PipeWire runtime |
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## Next Steps
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### Immediate (To Complete Milestone 1)
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1. **Install dependencies:**
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```bash
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sudo dnf install cmake qt6-qtbase-devel pipewire-devel gcc-c++
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```
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2. **Build:**
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```bash
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mkdir build && cd build && cmake .. && make
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```
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3. **Test:**
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```bash
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./potato-test
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```
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### Milestone 2: QtNodes Integration
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Once Milestone 1 is verified:
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- Integrate QtNodes library (as Git submodule)
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- Create GUI application skeleton with QMainWindow
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- Map PipeWire nodes to QtNodes visual nodes
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- Implement drag-and-drop connection creation
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- Display node metadata in UI
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**Estimated effort:** 2-3 weeks
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## Files Created Summary
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```
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/var/home/joey/Downloads/potato/
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├── CMakeLists.txt [BUILD CONFIG]
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├── .gitignore [GIT CONFIG]
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├── README.md [USER DOCS]
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├── PROJECT_PLAN.md [SPEC - UPDATED]
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├── VERIFICATION.md [TEST GUIDE]
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├── MILESTONE1_COMPLETE.md [THIS FILE]
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└── src/
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├── pipewire/
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│ ├── nodeinfo.h [DATA STRUCTURES]
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│ ├── nodeinfo.cpp
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│ ├── portinfo.h [PORT ALIASES]
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│ ├── portinfo.cpp
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│ ├── pipewirecontroller.h [MAIN CONTROLLER]
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│ └── pipewirecontroller.cpp
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└── main_test.cpp [CLI TEST APP]
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```
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## Conclusion
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**Milestone 1 is CODE COMPLETE.** All implementation requirements have been met:
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✅ Modern C++17 codebase with Qt6 integration
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✅ PipeWire native integration using recommended patterns
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✅ Thread-safe architecture with proper locking
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✅ Real-time consideration (atomics, prepared for lock-free queues)
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✅ Comprehensive test application
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✅ Clean, well-structured code ready for GUI development
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**Status: READY FOR BUILD & TEST**
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The code follows all best practices from the research phase:
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- Uses `pw_thread_loop` as recommended by Mumble/OBS Studio
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- Implements registry-based discovery like Qt Multimedia
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- Thread safety patterns match Telegram Desktop audio code
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- Lock-free atomics for state like production audio apps
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**Next Action:** Install build dependencies and run `make` to verify compilation.
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