Talon
a460009a2f
The AudioEngine capture clock is fixed at 48 kHz / 20 ms (960-sample frames), but a channel may set any Opus frame_ms (2.5..60 ms, voice.md §3) and the server enforces it unclamped. on_capture_frame handed the engine's 960-sample frame straight to an encoder configured for the channel's window: frame_ms > 20 was silently ignored, and frame_ms < 20 broke entirely (receiver sized its decode buffer too small -> OPUS_BUFFER_TOO_SMALL -> dead audio). Affected the hardware mic and vc_stream_feed_pcm alike. Reframe each captured/fed block to ls.frame_samples via a per-LocalStream accumulator (pre-sized at announce, no RT-thread alloc) before encode_and_send_frame; the 20 ms case stays a zero-copy fast path. Also pin the codec to 48 kHz in opus_params_from_audio_config — it was honoring a non-48k effective sample_rate against a 48 kHz PCM clock. New ctest frame_ms_reframe covers 40 ms (accumulate) and 10 ms (split) feed->encode->relay->decode->sink round trips. ctest --preset dev 25/25. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
163 lines
8.1 KiB
Markdown
163 lines
8.1 KiB
Markdown
# CLAUDE.md — agent hub for VoiceCat
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Auto-loaded each session. This is the **map**: build commands, architecture at a glance, and
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where everything is. For the *working method* read [`AGENTS.md`](AGENTS.md); for *what's done
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and what's next* read [`PROGRESS.md`](PROGRESS.md); for *design* read [`docs/`](docs/).
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> **One-line status:** M5 (moderation & admin UI) is complete — permissions, kick/ban/move,
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> server-mute, channel CRUD, in-app account management, disconnect/keepalive/reaper. Windows
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> WinForms C# client shipped (M4). **macOS AppKit client shipped** — `VoiceCatMac.xcodeproj`
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> at `clients/apple/macOS/`. **iOS SwiftUI client shipped** — `VoiceCatiOS.xcodeproj` at
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> `clients/apple/iOS/`. `ctest --preset dev` green — 25/25 tests.
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> External PCM feed/tap API (`vc_stream_feed_pcm` + `vc_set_pcm_sink`) shipped.
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> **Screen-audio sharing shipped on macOS (ScreenCaptureKit) and iOS (ReplayKit Broadcast
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> Upload Extension → host App Group ring → `vc_stream_feed_pcm`).** See [`PROGRESS.md`](PROGRESS.md).
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VoiceCat = self-hosted native voice & text chat (TeamSpeak/Mumble-style). Plain TCP (control)
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+ UDP (media), no WebRTC, encrypted by default. A shared C++ core (`libvoicecat`) drives
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native clients (Swift on macOS/iOS, C# on Windows) and the server.
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---
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## Build & test commands
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The default development preset is **`dev`** — it builds everything (server + tools + tests)
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with real vcpkg deps. The `skeleton` preset (no deps, stubs only) is a fast smoke check; see
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[`docs/building.md`](docs/building.md) for the full preset matrix.
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```bash
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# Configure + build (default development preset; needs VCPKG_ROOT)
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cmake --preset dev
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cmake --build --preset dev
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# Run the tests (21 behavior tests — grows per milestone)
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# NOTE on Windows: run ctest via PowerShell, NOT Git Bash — MinGW binaries fail in Git Bash
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# with exit 0xc0000139 (STATUS_ENTRYPOINT_NOT_FOUND). PowerShell runs them correctly.
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ctest --preset dev # or: ctest --test-dir build/dev --output-on-failure
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# Run the binaries — same Windows rule: use PowerShell, not Git Bash
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./build/dev/bin/vccli # headless test client
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./build/dev/bin/voicecat-server --help
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./build/dev/bin/voicecat-server --name "My Server"
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# Build a single target / be verbose
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cmake --build --preset dev --target vccli
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cmake --build --preset dev --verbose
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# Clean
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rm -rf build/dev # nuke; or:
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cmake --build --preset dev --target clean
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```
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Other presets (see [`docs/building.md`](docs/building.md) for full detail):
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```bash
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cmake --preset skeleton # no-deps stub smoke (no VCPKG_ROOT needed) — 2 tests
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cmake --preset release # optimized + tests on, symbols kept (profile/debug-friendly)
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cmake --preset server-release # optimized + stripped, no tests (deployment-shaped)
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cmake --preset windows-client # voicecat.dll for the C# WinForms client (Windows only)
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cmake --preset apple-dev # libvoicecat.a for macOS Swift Package (scaffolding, macOS only)
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```
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Vcpkg triplet is auto-resolved from the host platform by
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[`cmake/voicecat-toolchain.cmake`](cmake/voicecat-toolchain.cmake) — `x64-mingw-static` on
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Windows, `x64-linux` on Linux, `arm64-osx` on Apple Silicon. See docs/building.md §1
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"Platform matrix" for details.
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One-time vcpkg setup:
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```bash
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# one-time: git clone https://github.com/microsoft/vcpkg && ./vcpkg/bootstrap-vcpkg.sh (.bat on Windows)
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export VCPKG_ROOT=/path/to/vcpkg # works on Linux / macOS / Windows
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```
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Other useful toggles (pass with `-D` at configure time):
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```bash
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cmake --preset dev -DVOICECAT_BUILD_SHARED=ON # build libvoicecat as a .dll/.so/.dylib (for the C# client)
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cmake --preset dev -DVOICECAT_BUILD_SERVER=OFF # core + tools only
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cmake --preset dev -DVOICECAT_BUILD_TESTS=OFF
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```
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Formatting: `clang-format` config is `.clang-format` (Google base, 100 cols, 4-space).
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```bash
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git ls-files '*.cpp' '*.h' | xargs clang-format -i
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```
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---
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## Architecture at a glance
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Full detail: [`docs/architecture.md`](docs/architecture.md). The short version:
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```
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Swift (macOS/iOS) ─┐ ┌─ C# (Windows)
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├──▶ libvoicecat (C ABI: voicecat.h) ◀──┤
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voicecat-server ───┘ net · crypto · codec · protocol · └─ all UIs are thin
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(links core) session · audio the core owns audio
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```
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- **One core, many faces.** Protocol, Opus, crypto, networking, jitter buffer, and mixing
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live once in C++. Clients call the **C ABI** (`core/include/voicecat.h`); the server links
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the same core, so framing/crypto never drift between ends.
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- **Two transports.** TCP + **TLS 1.3** (control, protobuf `Envelope`) and UDP + **exported-key
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ChaCha20-Poly1305 AEAD** (media, fixed binary voice frame). Encryption is mandatory.
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- **Threading.** Real-time audio threads never allocate/lock/block; they exchange data with
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the net thread via lock-free ring buffers; a worker pool absorbs blocking work.
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### Subsystem map (code ↔ design doc)
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| Path | Subsystem | Design |
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|------|-----------|--------|
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| `core/include/voicecat.h` | The C ABI (client/server contract) | architecture.md §4 |
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| `core/proto/voicecat.proto` | Control-plane wire format (source of truth) | protocol.md |
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| `core/src/net/` | Asio TCP/UDP transport, `[u32 len][payload]` framing | protocol.md §1, voice.md §2 |
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| `core/src/crypto/` | TLS 1.3 (mbedTLS), media AEAD (libsodium), anti-replay | security.md |
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| `core/src/codec/` | Opus encode/decode, FEC/DTX | voice.md §3–4 |
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| `core/src/protocol/` | Envelope (de)serialize, request/response, dispatch | protocol.md |
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| `core/src/session/` | Channels, users, streams, permissions, ephemeral text | protocol.md §5 |
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| `core/src/audio/` | miniaudio I/O, APM DSP, jitter buffer, mixer | voice.md §8–11 |
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| `core/src/core/` | `vc_client` — the handle behind the C ABI | architecture.md §4 |
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| `server/` | Connection mgr, session registry, SFU relay, SQLite | architecture.md §5 |
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| `tools/vccli/` | Headless client that drives/verifies the protocol | — |
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| `clients/apple/`, `clients/windows/` | Native GUIs (M4) | architecture.md §4 |
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---
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## Documentation index (source of truth)
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Read [`docs/`](docs/) before changing behavior. Order:
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1. [docs/README.md](docs/README.md) — overview, locked decisions, glossary
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2. [docs/architecture.md](docs/architecture.md) — core, C ABI, threading, server
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3. [docs/protocol.md](docs/protocol.md) — control plane, Envelope, message catalog
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4. [docs/voice.md](docs/voice.md) — UDP media, Opus, multi-stream, two-sided NR, VAD/PTT
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5. [docs/security.md](docs/security.md) — mandatory encryption, TLS+AEAD, accounts, threat model
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6. [docs/tech-stack.md](docs/tech-stack.md) — libraries, permissive-license rule, tooling
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7. [docs/deployment.md](docs/deployment.md) — zero-config self-host (Docker / binary / source)
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8. [docs/roadmap.md](docs/roadmap.md) — milestones + resolved decisions
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9. [docs/building.md](docs/building.md) — what each CMake preset is for + manual server/`vccli` testing
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---
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## Keeping track of progress
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**[`PROGRESS.md`](PROGRESS.md) is the living status file.** When you finish a task, check it
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off there and note the next step, so the next agent can pick up instantly. Treat it as part of
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the work, not an afterthought — update it in the same commit as the code.
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---
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## House rules (hard constraints)
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- **A clean compile is the floor, not the goal.** "Done" = the milestone's observable exit
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criterion in [`docs/roadmap.md`](docs/roadmap.md) passes (e.g. M1 = two `vccli` actually chat
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over TLS). Encode it as a test. See [`AGENTS.md`](AGENTS.md).
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- **No GPL/LGPL dependencies, ever** (closed-source redistribution is a goal). docs/tech-stack.md §5.
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- **Encryption is mandatory** — never add a plaintext transport path. docs/security.md.
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- **Real-time audio threads** never allocate, lock, or block. docs/architecture.md §3.
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- **Keep docs + code in sync.** Changing a wire format (`voicecat.proto`) or the C ABI
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(`voicecat.h`) is a deliberate, versioned act — update the doc in the same commit (protocol.md §8).
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- Every commit must build (`cmake --build --preset dev`) and pass `ctest --preset dev`.
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