Files

Claude 8d5f6fe044 feat: wire QUIC transport, JNI bridge, connect UI + add docs

- Replace raw FFI with proper `jni` crate for string marshalling
- Wire QUIC transport in engine: connect to relay, crypto handshake
  (CallOffer/CallAnswer, X25519+Ed25519), send/recv MediaPackets
- Feed received packets into jitter buffer (was previously ignored)
- Add connect screen UI with CALL button (idle state) and in-call
  controls (mute, speaker, hang up, live stats)
- Hardcode relay 172.16.81.125:4433, room "android"
- Add comprehensive docs in docs/android/:
  architecture.md (8 mermaid diagrams), build-guide.md,
  debugging.md, maintenance.md, roadmap.md

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-05 04:43:49 +00:00

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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 for arm64-v8a using cargo-ndk, invoked automatically by Gradle's cargoNdkBuild task.
Single-activity Compose: One CallActivity hosts all UI via Jetpack Compose with CallViewModel as the state holder.

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