Phase 4 (codec + audio capture slice). Adds the publisher-side MoQ
control messages and the Opus encode + microphone capture pieces a
speaker needs. The host-grants-speaker UI flow is deferred — that's
multi-screen UX that should be designed before being implemented.
commonMain (nestsclient.moq):
- 5 new MoqMessageType entries with codec round-trip + tests:
* Announce (0x06): publisher offers a track namespace.
* AnnounceOk (0x07): subscriber acknowledges.
* AnnounceError (0x08): subscriber rejects with error code +
reason phrase.
* Unannounce (0x09): publisher withdraws a previously-announced
namespace.
* SubscribeDone (0x0B): publisher tells the subscriber no more
objects are coming for this subscription, with stream count and
reason.
commonMain (nestsclient.audio):
- New `OpusEncoder` interface — symmetric to `OpusDecoder`, one
instance per outgoing track since Opus state is per-stream.
- New `AudioCapture` interface — `start()`, `readFrame()` returns a
PCM frame or null when stopped, `stop()` releases the mic.
androidMain (nestsclient.audio):
- `MediaCodecOpusEncoder` — wraps `MediaCodec("audio/opus")` encoder
variant (API 29+). 48 kHz mono in, 32 kbit/s VBR Opus out, 20 ms
frames. Drains output queue per encode call.
- `AudioRecordCapture` — wraps `AudioRecord` from
`MediaRecorder.AudioSource.VOICE_COMMUNICATION` so the platform's
echo-cancellation + noise-suppression filters apply when available.
Reads exactly one PCM frame per readFrame() call, retries on
underrun, throws AudioException(DeviceUnavailable) on permission/
resource failures.
commonTest:
- `AnnounceCodecTest` — 7 cases covering each message round-trip,
concatenated decode in sequence, and a guard against accidentally
reordering MoqMessageType enum codes.
Permission already declared:
- `RECORD_AUDIO` is already in amethyst/AndroidManifest.xml — no
manifest change needed.
What this does NOT include:
- A publisher loop class (analogous to AudioRoomPlayer for publish
direction) — can be added when the speak-button wiring lands.
- The host-grants-speaker UI — needs design input.
- STREAM_HEADER_SUBGROUP for stream-based object delivery — datagrams
cover the listener happy-path; streams add reliability that nests
may or may not require.
https://claude.ai/code/session_013nVLALALKaHVgHm9u5Cg8D
Claude
b62e3dd0ec