Four follow-up fixes from the post-audit review (#4 / #5 / #6 / #7).
#6 AcousticEchoCanceler / NoiseSuppressor / AGC on the AudioRecord
session. The VOICE_COMMUNICATION input source engages the platform
echo canceller automatically on most modern Android devices, but a
small set of older / OEM-customised devices only attach AEC under
MODE_IN_COMMUNICATION — which an audio-room app deliberately
avoids. Attaching the standalone audiofx effects to the
AudioRecord's session id covers those devices without rerouting
through the call audio path. All three are best-effort and a no-op
on devices where the source already engages them.
#4 Real audio focus handling. The previous OnAudioFocusChangeListener
was a no-op based on the assumption that the OS would auto-duck
us; it doesn't (CONTENT_TYPE_SPEECH streams aren't auto-ducked).
Inbound phone calls were mixing on top of room audio.
- New `NestAudioFocusBus` (commons) — process-wide enum signal,
decoupled from android.media so commons stays platform-free.
- NestForegroundService translates AUDIOFOCUS_GAIN / LOSS_TRANSIENT*
/ LOSS into the bus enum.
- NestViewModel observes the bus and silences both the listener
playback (effective listen-mute = user OR focus) and the
broadcast mic (effective mic-mute = user OR focus). User-visible
mute states stay the user's choice so a focus regain restores
them automatically.
- The pipeline keeps running while focus is lost (decoder, capture,
network) so unmute is sample-accurate when the call ends.
#5 AudioDeviceCallback observability. Registers a callback in
NestForegroundService that logs Bluetooth / wired / USB headset
attach + detach with device type + name. Doesn't drive playback
decisions — Android's auto-routing handles route swaps — but
makes "audio cut out when I plugged in headphones" reports
correlatable with a concrete event for the first time.
#7 Network-change → fast reconnect. Without this, a Wi-Fi → cellular
handover left the QUIC connection sitting on a now-dead socket
until its PTO fired (~30 s) before the wrapper noticed. Now:
- New `NestNetworkChangeBus` (commons) — collapses bursts of
onLost/onAvailable into a single recycle event.
- NestsListener + NestsSpeaker grow `recycleSession()` (default
no-op); the reconnecting wrappers override to close the inner
session so their orchestrator opens a fresh one.
- NestForegroundService registers a default-network callback;
suppresses the first onAvailable (registration callback)
and only publishes on actual default-network changes.
- NestViewModel observes the bus and calls recycleSession on
both wrappers. The SubscribeHandle re-issuance pump (listener)
and the hot-swap publisher pump (speaker) cut existing
subscriptions / broadcasts onto the new session as soon as
it lands — same paths the JWT-refresh recycle uses.
- Manifest gains ACCESS_NETWORK_STATE for
registerDefaultNetworkCallback.
Claude
6237c02c6f