- Default to PTT (push-to-talk) on call connect: mic muted until user holds button
- Toggle switch between PTT and free voice mode in active call controls
- PTT button: press-and-hold unmutes mic, release mutes again
- Voice message bubble (waveform + duration) appears after each PTT send
- Mute button hidden in PTT mode (mic controlled by PTT button)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
voice-agent agent.py:
- Module docstring explains lk.agent.state lifecycle
(initializing → listening → thinking → speaking)
- Explains how RoomIO publishes state as participant attribute
- Documents BackgroundAudioPlayer with all available built-in clips
Flutter agent_call_page.dart:
- Documents _agentState field and all possible values
- Documents ParticipantAttributesChanged listener with UI mapping
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- voice-agent: enable BackgroundAudioPlayer with keyboard typing sound
during LLM thinking state (auto-plays when agent enters "thinking",
stops when "speaking" starts)
- Flutter: monitor lk.agent.state participant attribute from LiveKit
agent, show pulsing dots animation + "思考中..." text when thinking,
avatar border changes to warning color with pulsing glow ring
- Both call mode and chat mode headers show thinking state
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Problem:
- Text input area caused BOTTOM OVERFLOWED BY 135 PIXELS when keyboard opened
- Input bar overlapped with call control buttons
- Sent messages were not displayed on screen (only SnackBar feedback)
Solution — split into two distinct layouts:
1. Call Mode (default):
- Full-screen call UI: avatar, waveform, duration, large control buttons
- Keyboard button in controls toggles to chat mode
- No text input elements — clean voice-only interface
2. Chat Mode (tap keyboard button):
- Compact call header: green status dot + "iAgent" + duration + inline
mute/end/speaker/collapse controls
- Scrollable message list (Expanded widget — properly handles keyboard)
- User messages: right-aligned blue bubbles with attachment thumbnails
- Agent responses: left-aligned gray bubbles with robot avatar
- Input bar at bottom: attachment picker + text field + send button
Message display:
- User-sent text/attachments tracked in _messages list, shown as bubbles
- Agent responses sent back via LiveKit data channel (topic='text_reply')
from voice-agent → Flutter, displayed as assistant bubbles
- Auto-scroll to latest message
Voice-agent change (agent.py):
- After session.say(response), publish response text back to Flutter via
ctx.room.local_participant.publish_data() with topic='text_reply'
- Flutter listens for DataReceivedEvent to display agent responses
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Enable users to send text messages, images, and files to the Agent
while an active voice call is in progress. This addresses the case
where spoken instructions are unclear or screenshots/documents need
to be shared for analysis.
## Architecture
Data flows through LiveKit data channel (not direct HTTP):
Flutter → publishData(topic='text_inject') → voice-agent
→ llm.inject_text_message() → POST /api/v1/agent/tasks (same session)
→ collect streamed response → session.say() → TTS playback
This preserves the constraint that voice-agent owns the agent-service
sessionId — Flutter never contacts agent-service directly.
## Flutter UI (agent_call_page.dart)
- Add keyboard toggle button to active call controls (4-button row)
- Collapsible text input area with attachment picker (+) and send button
- Attachment support: gallery multi-select, camera, file picker
(images max 1024x1024 quality 80%, PDF supported, max 5 attachments)
- Horizontal scrolling attachment preview with delete buttons
- 200KB payload size check before LiveKit data channel send
- Layout adapts: Spacer flex 1/3 toggle, reduced bottom padding
## voice-agent (agent.py)
- Register data_received event listener after session.start()
- Filter for topic='text_inject', parse JSON payload
- Call llm.inject_text_message(text, attachments) and TTS via session.say()
- Use asyncio.ensure_future() wrapper for async handler (matches
existing disconnect handler pattern for sync EventEmitter)
## AgentServiceLLM (agent_llm.py)
- New inject_text_message(text, attachments) method on AgentServiceLLM
- Reuses same _agent_session_id for conversation context continuity
- WS+HTTP streaming: connect, pre-subscribe, POST /tasks with
attachments field, collect full text response, return string
- _injecting flag prevents concurrent _do_stream from clearing
session ID on abort errors while inject is in progress
- Same systemPrompt/voiceMode/engineType as voice pipeline
No agent-service changes required — attachments already supported
end-to-end (JSONB storage → multimodal content blocks → Claude).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Full-stack implementation allowing users to choose between Claude Agent SDK
(default, with tool approval, skill injection, session resume) and Claude API
(direct, lower latency) in Flutter settings. Agent SDK mode wraps prompts with
voice-conversation instructions for concise spoken Chinese output.
Data flow: Flutter Settings → SharedPreferences → POST /livekit/token →
RoomAgentDispatch metadata → voice-agent → AgentServiceLLM(engine_type)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Flutter (agent_call_page.dart):
- Add ConnectOptions with 15s timeouts for connection/peerConnection/iceRestart
- Add RoomReconnectingEvent/RoomAttemptReconnectEvent/RoomReconnectedEvent
listeners with "网络重连中" UI indicator during reconnection
- Add TimeoutException detection in _friendlyError()
voice-agent (agent.py):
- Wrap entrypoint() in try-except with full traceback logging
- Register room disconnect listener to close httpx clients (instead of
finally block, since session.start() returns while session runs in bg)
- Add asyncio import for ensure_future cleanup
voice-agent LLM proxy (agent_llm.py):
- Add retry with exponential backoff (max 2 retries, 1s/3s delays) for
network errors (ConnectError/ConnectTimeout/OSError) and WS InvalidStatusCode
- Extract _do_stream() method for single-attempt logic
- Add WebSocket connection params: open_timeout=10, ping_interval=20,
ping_timeout=10 for keepalive and faster dead-connection detection
- Use granular httpx.Timeout(connect=10, read=30, write=10, pool=10)
- Increase WS recv timeout from 5s to 30s to reduce unnecessary loops
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add user-configurable TTS voice and tone style settings that flow from
the Flutter app through the backend to the voice-agent at call time.
## Flutter App (it0_app)
### Domain Layer
- app_settings.dart: Add `ttsVoice` (default: 'coral') and `ttsStyle`
(default: '') fields to AppSettings entity with copyWith support
### Data Layer
- settings_datasource.dart: Add SharedPreferences keys
`settings_tts_voice` and `settings_tts_style` for local persistence
in loadSettings(), saveSettings(), and clearSettings()
### Presentation Layer
- settings_providers.dart: Add `setTtsVoice()` and `setTtsStyle()`
methods to SettingsNotifier for Riverpod state management
- settings_page.dart: Add "语音" settings group between Notifications
and Security groups with:
- Voice picker: 13 OpenAI voices with gender/style labels
(e.g. "女 · 温暖", "男 · 沉稳", "中性") in a BottomSheet
- Style picker: 5 presets (专业干练/温柔耐心/轻松活泼/严肃正式/科幻AI)
as ChoiceChips + custom text input field + reset button
### Call Flow
- agent_call_page.dart: Send `tts_voice` and `tts_style` in the POST
body when requesting a LiveKit token at call initiation
## Backend
### voice-service (Python/FastAPI)
- livekit_token.py: Accept optional `tts_voice` and `tts_style` via
Pydantic TokenRequest body model; embed them in RoomAgentDispatch
metadata JSON alongside auth_header (backward compatible)
### voice-agent (Python/LiveKit Agents)
- agent.py: Extract `tts_voice` and `tts_style` from ctx.job.metadata;
use them when creating openai_plugin.TTS() — user-selected voice
overrides config default, user-selected style overrides default
instructions. Falls back to config defaults when not provided.
## Data Flow
Flutter Settings → SharedPreferences → POST /livekit/token body →
voice-service embeds in RoomAgentDispatch metadata →
voice-agent reads from ctx.job.metadata → TTS creation
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Use Hardware.instance.setSpeakerphoneOn() to switch between speaker
and earpiece modes. Default to speaker on.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
livekit_client 2.6.4 no longer has audioBitrate parameter.
Default AudioPublishOptions auto-selects optimal speech bitrate.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Server side (session_router.py):
- /reconnect now accepts sessions in "active" state (not just "disconnected")
- When client reconnects to an active session, the old WebSocket/pipeline is
automatically replaced when the new WebSocket connects
- Only truly terminal states (e.g. "ended") return 409
Flutter side (agent_call_page.dart):
- Distinguish terminal errors (404 session gone, 409 ended) from transient
errors (network timeout, server unreachable) in reconnect loop
- Terminal errors break immediately instead of wasting retry attempts
- Extract _connectWebSocket() helper for cleaner reconnect flow
- Add DioException handling for proper HTTP status code inspection
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Root cause: PcmPlayer called openPlayer() without audio session config,
so Android defaulted to earpiece-only mode. When the mic was actively
recording, playback was silently suppressed — the agent's TTS audio was
sent successfully over WebSocket but never reached the speaker.
Changes:
1. PcmPlayer (pcm_player.dart):
- Added audio_session package for proper audio session management
- Configure AudioSession with playAndRecord category so mic + speaker
work simultaneously
- Set voiceCommunication usage to enable Android hardware AEC (echo
cancellation) — prevents feedback loops when speaker is active
- defaultToSpeaker routes output to loudspeaker instead of earpiece
- Restored setSpeakerOn() method stub (used by UI toggle)
2. AgentCallPage (agent_call_page.dart):
- Fixed fire-and-forget bug: _pcmPlayer.feed() returns Future but was
called without await, causing interleaved feedUint8FromStream calls
- Added _feedChain serializer to guarantee sequential audio feeding
3. Dependencies:
- Added audio_session package to pubspec.yaml
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Local /synthesize and /transcribe endpoints now auto-load Kokoro/Whisper
models on first call instead of returning 503 when not pre-loaded at
startup. This allows switching between Local and OpenAI providers in the
Flutter test page without requiring server restart.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Remove shared interceptors from the binary Dio instance to prevent
request dedup/retry interceptors from interfering with audio downloads.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replace hardcoded Colors.grey with Theme.of(context).colorScheme for
result containers and status text so they're readable in both light
and dark themes.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add openai package to voice-service requirements
- Add /api/v1/test/tts/synthesize-openai (tts-1/tts-1-hd/gpt-4o-mini-tts)
- Add /api/v1/test/stt/transcribe-openai (gpt-4o-transcribe/whisper-1)
- Add OPENAI_API_KEY and OPENAI_BASE_URL env vars to voice-service
- Flutter test page: SegmentedButton to toggle Local/OpenAI provider
- All endpoints maintain same response format for easy comparison
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Remove record package dependency, use FlutterSoundRecorder instead
- Use permission_handler for microphone permission (already in pubspec)
- Proper temp file path via path_provider
- Cleanup temp files after upload
- Single package (flutter_sound) handles both recording and playback
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The record package requires a valid file path. Empty string caused
ENOENT (No such file or directory) on Android.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Claude API engine now uses streaming API (messages.stream) for real-time
text delta output instead of waiting for full response
- Agent controller accepts optional engineType body parameter to allow
callers (e.g. voice pipeline) to select a specific engine
- Fix voice_test_page.dart compilation error: replace audioplayers (not
installed) with flutter_sound (already in pubspec.yaml)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Root cause: Pipecat's WebsocketServerTransport creates its own WebSocket
server on (host,port) and expects FrameProcessor subclasses. Our code was
passing a FastAPI WebSocket object as 'host' and using plain STT/TTS/VAD
service classes that aren't FrameProcessors. The pipeline crashed immediately
when receiving audio, causing "disconnects when speaking".
Changes:
- **base_pipeline.py**: Complete rewrite — replaced Pipecat Pipeline with
direct async loop: WebSocket → VAD → STT → Claude LLM → TTS → WebSocket.
Supports barge-in (interrupt TTS when user speaks), audio chunking, and
24kHz→16kHz TTS resampling.
- **session_router.py**: Pass WebSocket directly to pipeline instead of
wrapping in AppTransport.
- **app_transport.py**: Deprecated (no longer needed).
- **kokoro_service.py**: Fix misaki compatibility (MutableToken→MToken
rename), use correct Chinese voice 'zf_xiaoxiao', handle torch tensors.
- **main.py**: Apply misaki monkey-patch before importing kokoro.
- **settings.py**: Change default TTS voice from 'zh_female_1' (non-existent)
to 'zf_xiaoxiao' (valid Kokoro-82M Chinese female voice).
- **requirements.txt**: Remove pipecat-ai dependency, pin kokoro==0.3.5 +
misaki==0.7.17, add Chinese NLP deps (pypinyin, cn2an, jieba, ordered-set).
- **agent_call_page.dart**: Wrap each cleanup step in try/catch to ensure
Navigator.pop() always executes after call ends. Add 3s timeout on session
delete request.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Addresses reliability gaps in the real-time voice WebSocket connection
between Flutter client and Python voice-service backend.
Backend (voice-service):
- Heartbeat: new _heartbeat_sender coroutine sends JSON ping text frames
every 15s alongside the Pipecat pipeline; failed send = dead connection
- Session preservation: on WebSocket disconnect, sessions are now marked
"disconnected" with a timestamp instead of being deleted, allowing
reconnection within a configurable TTL (default 60s)
- Reconnect endpoint: POST /sessions/{id}/reconnect verifies the session
is alive and in "disconnected" state, returns fresh websocket_url
- Reconnect-aware WS handler: detects "disconnected" sessions, cancels
stale pipeline tasks, creates a new pipeline, sends "session.resumed"
- Background cleanup: asyncio loop every 30s removes sessions that have
been disconnected longer than session_ttl
- Structured event protocol: text frames = JSON control messages
(ping/pong/session.resumed/session.ended/error), binary = PCM audio
- New settings: session_ttl (60s), heartbeat_interval (15s),
heartbeat_timeout (45s)
Flutter (agent_call_page.dart):
- Heartbeat monitoring: tracks last server ping timestamp, triggers
reconnect if no ping received in 45s (3 missed intervals)
- Auto-reconnect: exponential backoff (1s→2s→4s→8s→16s), max 5 attempts;
calls /reconnect endpoint to verify session, rebuilds WebSocket,
resets audio buffer, restarts heartbeat
- Reconnecting UI: yellow warning banner "重新连接中... (N/5)" with
spinner overlay during reconnection attempts
- WebSocket data routing: _onWsData distinguishes String (JSON control)
from binary (audio) frames, handles ping/session.resumed/session.ended
- User-initiated disconnect guard: _userEndedCall flag prevents reconnect
attempts when user intentionally hangs up
- session_id field compatibility: supports session_id/sessionId/id
Flutter (pcm_player.dart):
- Jitter buffer: queues incoming PCM chunks, starts playback only after
accumulating 4800 bytes (150ms at 16kHz 16-bit mono) to smooth out
network timing variance
- reset() method: clears buffer on reconnect to discard stale audio
- Buffer underrun handling: re-enters buffering phase if queue empties
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Web Admin:
- Update browser title to "iAgent Admin Console"
- Translation: en appTitle "iAgent", zh appTitle "我智能体"
- Sidebar: en "iAgent Admin", zh "我智能体"
- Settings placeholder: "iAgent Platform" / "我智能体平台"
- Update alt tags on logo images
Flutter:
- MaterialApp title: "iAgent"
- Chat: "Ask iAgent..." / "Start a conversation with iAgent"
- Terminal: "iAgent Remote Terminal"
- Agent call: "iAgent Calling" / "iAgent"
Logo SVG: text changed from "AI AGENT" to "iAgent"
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
hailin