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Complete spec for fixing the playout ring buffer cursor race that causes 12-16s bidirectional silence mid-call. Includes exact code, memory ordering rationale, unit tests, and verification steps. Any agent can implement from this document alone. See also: debug/INCIDENT-2026-04-06-playout-ring-desync.md Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
WarzonePhone Android Client
The WZP Android client is a native VoIP application built with Kotlin/Jetpack Compose on top of a Rust audio engine. It connects to WZP relay servers over QUIC, providing encrypted voice calls with adaptive quality, forward error correction, and acoustic echo cancellation.
Quick Start
- Build:
cd android && ./gradlew assembleRelease(requires NDK 26.1, cargo-ndk) - Install:
adb install app/build/outputs/apk/release/app-release.apk - Run: Open "WZ Phone", tap CALL to connect to the hardcoded relay
- Relay: Must be running at the configured address (default
172.16.81.125:4433)
Current State (April 2025)
| Feature | Status |
|---|---|
| QUIC transport to relay | Working |
| Crypto handshake (X25519 + Ed25519) | Working |
| Opus 24k encoding/decoding | Working |
| Oboe audio I/O (48kHz mono) | Working |
| AEC / AGC signal processing | Working |
| RaptorQ FEC | Wired (repair symbols not sent yet) |
| Jitter buffer | Working |
| Adaptive quality switching | Codec-ready, not network-driven yet |
| Authentication (featherChat) | Skipped (relay has no --auth-url) |
| Media encryption (ChaCha20-Poly1305) | Session derived but not applied to packets |
| Foreground service / wake locks | Implemented, not started from UI |
Documentation Index
- Architecture - System design, data flow diagrams, thread model
- Build Guide - Build environment setup, dependencies, signing
- Debugging - Crash diagnosis, logcat filters, common issues
- Maintenance - Code map, dependency management, upgrade paths
- Roadmap - Planned work and known gaps
Key Design Decisions
- Rust native engine: All audio processing, codecs, FEC, crypto, and networking run in Rust. Kotlin is UI-only.
- Lock-free audio: SPSC ring buffers with atomic ordering between Oboe C++ callbacks and the Rust codec thread. No mutexes in the audio path.
- cargo-ndk: The native library (
libwzp_android.so) is cross-compiled forarm64-v8ausing cargo-ndk, invoked automatically by Gradle'scargoNdkBuildtask. - Single-activity Compose: One
CallActivityhosts all UI via Jetpack Compose withCallViewModelas the state holder.