$ show BelledonneCommunications/linphone-desktop
Linphone Desktop is a production-grade, cross-platform SIP softphone built on the Linphone C++ SDK and wrapped in a Qt6/QML user interface. It delivers audio/video calls, instant messaging (including group chat, file transfer, reactions, and ephemeral messages), conference scheduling, call recording, and presence management across Windows, macOS, and Linux. The architecture follows a strict MVVM split: model classes run on the Linphone SDK thread and expose Qt signals, while GUI-facing 'Core' classes live on the main thread and communicate with models via a custom SafeConnection template that enforces thread affinity. QML views bind directly to these cores, with list proxies (e.g., ListProxy, SortFilterProxy) providing paginated, filterable models for contact lists, call history, and chat logs. The codebase also integrates advanced features like OIDC/OAuth authentication, LDAP/CardDAV address book sync, end-to-end encryption (LIME/DTLS/SRTP), and system-level integrations (toast notifications, tray icons, screen-sharing, autostart) with per-platform backends. The repository is actively maintained with a modern build system (CMake), comprehensive GitLab CI pipelines (Linux, macOS, Windows, Squish GUI tests), and a substantial localization effort (multiple .ts files).
The LLM identified 3 files worth highlighting for reuse:
A self-contained C++ template that enables safe signal/slot connections between objects living on different threads (GUI and SDK threads). It wraps QObject connections with automatic disconnection on destruction and employs SafeSharedPointer to manage lifetimes. The pattern is generic and can be extracted into any Qt project to eliminate unsafe raw QObject::connect calls when moving signals across threads.
A QAbstractListModel implementation that provides a reusable, generic list model for QML, supporting append, prepend, remove, reset, and row counting. It relies on a simple item signature (QSharedPointer<QObject>) and is designed to be subclassed. The pattern is generic enough to be extracted and used as a boilerplate-free base for any QObject-backed list in a Qt Quick application, reducing repetitive code found in hand-written models.
A centralized utility that resolves all writable and readable file paths for the application (config, database, avatars, downloads, logs, etc.) with platform-specific logic and migration helpers. Although built for Linphone, it demonstrates a clean, testable pattern for managing user-data directories in a Qt desktop application. The class isolates filesystem responsibilities and could be adapted with minor name changes to any desktop app needing a consistent path abstraction.