1520 lines
62 KiB
Python
1520 lines
62 KiB
Python
"""Full duplex audio pipeline for AI voice conversation.
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This module implements the core duplex pipeline that orchestrates:
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- VAD (Voice Activity Detection)
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- EOU (End of Utterance) Detection
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- ASR (Automatic Speech Recognition) - optional
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- LLM (Language Model)
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- TTS (Text-to-Speech)
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Inspired by pipecat's frame-based architecture and active-call's
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event-driven design.
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"""
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import asyncio
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import json
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import time
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from typing import Any, Dict, List, Optional, Tuple
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import numpy as np
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from loguru import logger
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from app.config import settings
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from core.conversation import ConversationManager, ConversationState
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from core.events import get_event_bus
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from core.tool_executor import execute_server_tool
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from core.transports import BaseTransport
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from models.ws_v1 import ev
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from processors.eou import EouDetector
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from processors.vad import SileroVAD, VADProcessor
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from services.asr import BufferedASRService
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from services.base import BaseASRService, BaseLLMService, BaseTTSService, LLMMessage, LLMStreamEvent
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from services.llm import MockLLMService, OpenAILLMService
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from services.siliconflow_asr import SiliconFlowASRService
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from services.siliconflow_tts import SiliconFlowTTSService
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from services.streaming_text import extract_tts_sentence, has_spoken_content
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from services.tts import EdgeTTSService, MockTTSService
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class DuplexPipeline:
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"""
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Full duplex audio pipeline for AI voice conversation.
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Handles bidirectional audio flow with:
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- User speech detection and transcription
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- AI response generation
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- Text-to-speech synthesis
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- Barge-in (interruption) support
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Architecture (inspired by pipecat):
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User Audio → VAD → EOU → [ASR] → LLM → TTS → Audio Out
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↓
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Barge-in Detection → Interrupt
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"""
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_SENTENCE_END_CHARS = frozenset({"。", "！", "？", ".", "!", "?", "\n"})
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_SENTENCE_TRAILING_CHARS = frozenset({"。", "！", "？", ".", "!", "?", "…", "~", "～", "\n"})
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_SENTENCE_CLOSERS = frozenset({'"', "'", "”", "’", ")", "]", "}", "）", "】", "」", "』", "》"})
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_MIN_SPLIT_SPOKEN_CHARS = 6
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_TOOL_WAIT_TIMEOUT_SECONDS = 15.0
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_SERVER_TOOL_TIMEOUT_SECONDS = 15.0
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_DEFAULT_TOOL_SCHEMAS: Dict[str, Dict[str, Any]] = {
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"search": {
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"name": "search",
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"description": "Search the internet for recent information",
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"parameters": {
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"type": "object",
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"properties": {"query": {"type": "string"}},
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"required": ["query"],
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},
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},
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"calculator": {
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"name": "calculator",
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"description": "Evaluate a math expression",
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"parameters": {
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"type": "object",
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"properties": {"expression": {"type": "string"}},
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"required": ["expression"],
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},
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},
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"weather": {
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"name": "weather",
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"description": "Get weather by city name",
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"parameters": {
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"type": "object",
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"properties": {"city": {"type": "string"}},
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"required": ["city"],
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},
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},
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"translate": {
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"name": "translate",
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"description": "Translate text to target language",
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"parameters": {
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"type": "object",
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"properties": {
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"text": {"type": "string"},
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"target_lang": {"type": "string"},
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},
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"required": ["text", "target_lang"],
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},
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},
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"knowledge": {
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"name": "knowledge",
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"description": "Query knowledge base by question",
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"parameters": {
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"type": "object",
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"properties": {
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"query": {"type": "string"},
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"kb_id": {"type": "string"},
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},
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"required": ["query"],
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},
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},
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"current_time": {
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"name": "current_time",
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"description": "Get current local time",
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"parameters": {
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"type": "object",
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"properties": {},
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"required": [],
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},
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},
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"code_interpreter": {
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"name": "code_interpreter",
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"description": "Execute Python code in a controlled environment",
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"parameters": {
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"type": "object",
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"properties": {"code": {"type": "string"}},
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"required": ["code"],
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},
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},
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"turn_on_camera": {
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"name": "turn_on_camera",
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"description": "Turn on camera on client device",
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"parameters": {
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"type": "object",
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"properties": {},
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"required": [],
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},
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},
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"turn_off_camera": {
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"name": "turn_off_camera",
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"description": "Turn off camera on client device",
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"parameters": {
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"type": "object",
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"properties": {},
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"required": [],
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},
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},
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"increase_volume": {
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"name": "increase_volume",
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"description": "Increase speaker volume",
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"parameters": {
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"type": "object",
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"properties": {"step": {"type": "integer"}},
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"required": [],
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},
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},
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"decrease_volume": {
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"name": "decrease_volume",
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"description": "Decrease speaker volume",
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"parameters": {
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"type": "object",
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"properties": {"step": {"type": "integer"}},
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"required": [],
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},
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},
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}
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def __init__(
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self,
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transport: BaseTransport,
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session_id: str,
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llm_service: Optional[BaseLLMService] = None,
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tts_service: Optional[BaseTTSService] = None,
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asr_service: Optional[BaseASRService] = None,
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system_prompt: Optional[str] = None,
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greeting: Optional[str] = None
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):
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"""
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Initialize duplex pipeline.
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Args:
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transport: Transport for sending audio/events
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session_id: Session identifier
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llm_service: LLM service (defaults to OpenAI)
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tts_service: TTS service (defaults to EdgeTTS)
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asr_service: ASR service (optional)
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system_prompt: System prompt for LLM
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greeting: Optional greeting to speak on start
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"""
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self.transport = transport
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self.session_id = session_id
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self.event_bus = get_event_bus()
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# Initialize VAD
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self.vad_model = SileroVAD(
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model_path=settings.vad_model_path,
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sample_rate=settings.sample_rate
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)
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self.vad_processor = VADProcessor(
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vad_model=self.vad_model,
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threshold=settings.vad_threshold
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)
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# Initialize EOU detector
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self.eou_detector = EouDetector(
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silence_threshold_ms=settings.vad_eou_threshold_ms,
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min_speech_duration_ms=settings.vad_min_speech_duration_ms
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)
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# Initialize services
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self.llm_service = llm_service
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self.tts_service = tts_service
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self.asr_service = asr_service # Will be initialized in start()
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# Track last sent transcript to avoid duplicates
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self._last_sent_transcript = ""
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# Conversation manager
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self.conversation = ConversationManager(
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system_prompt=system_prompt,
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greeting=greeting
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)
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# State
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self._running = True
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self._is_bot_speaking = False
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self._current_turn_task: Optional[asyncio.Task] = None
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self._audio_buffer: bytes = b""
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max_buffer_seconds = settings.max_audio_buffer_seconds if hasattr(settings, "max_audio_buffer_seconds") else 30
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self._max_audio_buffer_bytes = int(settings.sample_rate * 2 * max_buffer_seconds)
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# Keep a short rolling pre-speech window so VAD transition latency
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# does not clip the first phoneme/character sent to ASR.
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pre_speech_ms = settings.asr_pre_speech_ms if hasattr(settings, "asr_pre_speech_ms") else 240
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self._asr_pre_speech_bytes = int(settings.sample_rate * 2 * (pre_speech_ms / 1000.0))
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self._pre_speech_buffer: bytes = b""
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# Add a tiny trailing silence tail before final ASR to avoid
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# clipping the last phoneme at utterance boundaries.
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asr_final_tail_ms = settings.asr_final_tail_ms if hasattr(settings, "asr_final_tail_ms") else 120
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self._asr_final_tail_bytes = int(settings.sample_rate * 2 * (asr_final_tail_ms / 1000.0))
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self._last_vad_status: str = "Silence"
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self._process_lock = asyncio.Lock()
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# Priority outbound dispatcher (lower value = higher priority).
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self._outbound_q: asyncio.PriorityQueue[Tuple[int, int, str, Any]] = asyncio.PriorityQueue()
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self._outbound_seq = 0
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self._outbound_task: Optional[asyncio.Task] = None
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self._drop_outbound_audio = False
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# Interruption handling
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self._interrupt_event = asyncio.Event()
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# Latency tracking - TTFB (Time to First Byte)
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self._turn_start_time: Optional[float] = None
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self._first_audio_sent: bool = False
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# Barge-in filtering - require minimum speech duration to interrupt
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self._barge_in_speech_start_time: Optional[float] = None
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self._barge_in_min_duration_ms: int = settings.barge_in_min_duration_ms if hasattr(settings, 'barge_in_min_duration_ms') else 50
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self._barge_in_speech_frames: int = 0 # Count speech frames
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self._barge_in_silence_frames: int = 0 # Count silence frames during potential barge-in
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self._barge_in_silence_tolerance: int = 3 # Allow up to 3 silence frames (60ms at 20ms chunks)
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# Runtime overrides injected from session.start metadata
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self._runtime_llm: Dict[str, Any] = {}
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self._runtime_asr: Dict[str, Any] = {}
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self._runtime_tts: Dict[str, Any] = {}
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self._runtime_output: Dict[str, Any] = {}
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self._runtime_system_prompt: Optional[str] = None
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self._runtime_first_turn_mode: str = "bot_first"
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self._runtime_greeting: Optional[str] = None
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self._runtime_generated_opener_enabled: Optional[bool] = None
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self._runtime_barge_in_enabled: Optional[bool] = None
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self._runtime_barge_in_min_duration_ms: Optional[int] = None
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self._runtime_knowledge: Dict[str, Any] = {}
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self._runtime_knowledge_base_id: Optional[str] = None
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self._runtime_tools: List[Any] = []
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self._runtime_tool_executor: Dict[str, str] = {}
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self._pending_tool_waiters: Dict[str, asyncio.Future] = {}
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self._early_tool_results: Dict[str, Dict[str, Any]] = {}
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self._completed_tool_call_ids: set[str] = set()
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logger.info(f"DuplexPipeline initialized for session {session_id}")
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def apply_runtime_overrides(self, metadata: Optional[Dict[str, Any]]) -> None:
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"""
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Apply runtime overrides from WS session.start metadata.
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Expected metadata shape:
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{
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"systemPrompt": "...",
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"greeting": "...",
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"services": {
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"llm": {...},
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"asr": {...},
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"tts": {...}
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}
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}
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"""
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if not metadata:
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return
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if "systemPrompt" in metadata:
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self._runtime_system_prompt = str(metadata.get("systemPrompt") or "")
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if self._runtime_system_prompt:
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self.conversation.system_prompt = self._runtime_system_prompt
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if "firstTurnMode" in metadata:
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raw_mode = str(metadata.get("firstTurnMode") or "").strip().lower()
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self._runtime_first_turn_mode = "user_first" if raw_mode == "user_first" else "bot_first"
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if "greeting" in metadata:
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greeting_payload = metadata.get("greeting")
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if isinstance(greeting_payload, dict):
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self._runtime_greeting = str(greeting_payload.get("text") or "")
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generated_flag = self._coerce_bool(greeting_payload.get("generated"))
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if generated_flag is not None:
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self._runtime_generated_opener_enabled = generated_flag
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else:
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self._runtime_greeting = str(greeting_payload or "")
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self.conversation.greeting = self._runtime_greeting or None
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generated_opener_flag = self._coerce_bool(metadata.get("generatedOpenerEnabled"))
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if generated_opener_flag is not None:
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self._runtime_generated_opener_enabled = generated_opener_flag
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services = metadata.get("services") or {}
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if isinstance(services, dict):
|
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if isinstance(services.get("llm"), dict):
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self._runtime_llm = services["llm"]
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||
if isinstance(services.get("asr"), dict):
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self._runtime_asr = services["asr"]
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if isinstance(services.get("tts"), dict):
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self._runtime_tts = services["tts"]
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output = metadata.get("output") or {}
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||
if isinstance(output, dict):
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self._runtime_output = output
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barge_in = metadata.get("bargeIn")
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||
if isinstance(barge_in, dict):
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barge_in_enabled = self._coerce_bool(barge_in.get("enabled"))
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||
if barge_in_enabled is not None:
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||
self._runtime_barge_in_enabled = barge_in_enabled
|
||
min_duration = barge_in.get("minDurationMs")
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||
if isinstance(min_duration, (int, float, str)):
|
||
try:
|
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self._runtime_barge_in_min_duration_ms = max(0, int(min_duration))
|
||
except (TypeError, ValueError):
|
||
self._runtime_barge_in_min_duration_ms = None
|
||
|
||
knowledge_base_id = metadata.get("knowledgeBaseId")
|
||
if knowledge_base_id is not None:
|
||
kb_id = str(knowledge_base_id).strip()
|
||
self._runtime_knowledge_base_id = kb_id or None
|
||
|
||
knowledge = metadata.get("knowledge")
|
||
if isinstance(knowledge, dict):
|
||
self._runtime_knowledge = knowledge
|
||
kb_id = str(knowledge.get("kbId") or knowledge.get("knowledgeBaseId") or "").strip()
|
||
if kb_id:
|
||
self._runtime_knowledge_base_id = kb_id
|
||
|
||
tools_payload = metadata.get("tools")
|
||
if isinstance(tools_payload, list):
|
||
self._runtime_tools = tools_payload
|
||
self._runtime_tool_executor = self._resolved_tool_executor_map()
|
||
elif "tools" in metadata:
|
||
self._runtime_tools = []
|
||
self._runtime_tool_executor = {}
|
||
|
||
if self.llm_service and hasattr(self.llm_service, "set_knowledge_config"):
|
||
self.llm_service.set_knowledge_config(self._resolved_knowledge_config())
|
||
if self.llm_service and hasattr(self.llm_service, "set_tool_schemas"):
|
||
self.llm_service.set_tool_schemas(self._resolved_tool_schemas())
|
||
|
||
@staticmethod
|
||
def _coerce_bool(value: Any) -> Optional[bool]:
|
||
if isinstance(value, bool):
|
||
return value
|
||
if isinstance(value, (int, float)):
|
||
return bool(value)
|
||
if isinstance(value, str):
|
||
normalized = value.strip().lower()
|
||
if normalized in {"1", "true", "yes", "on", "enabled"}:
|
||
return True
|
||
if normalized in {"0", "false", "no", "off", "disabled"}:
|
||
return False
|
||
return None
|
||
|
||
def _tts_output_enabled(self) -> bool:
|
||
enabled = self._coerce_bool(self._runtime_tts.get("enabled"))
|
||
if enabled is not None:
|
||
return enabled
|
||
|
||
output_mode = str(self._runtime_output.get("mode") or "").strip().lower()
|
||
if output_mode in {"text", "text_only", "text-only"}:
|
||
return False
|
||
|
||
return True
|
||
|
||
def _generated_opener_enabled(self) -> bool:
|
||
return self._runtime_generated_opener_enabled is True
|
||
|
||
def _bot_starts_first(self) -> bool:
|
||
return self._runtime_first_turn_mode != "user_first"
|
||
|
||
def _barge_in_enabled(self) -> bool:
|
||
if self._runtime_barge_in_enabled is not None:
|
||
return self._runtime_barge_in_enabled
|
||
return True
|
||
|
||
def _resolved_barge_in_min_duration_ms(self) -> int:
|
||
if self._runtime_barge_in_min_duration_ms is not None:
|
||
return self._runtime_barge_in_min_duration_ms
|
||
return self._barge_in_min_duration_ms
|
||
|
||
async def _generate_runtime_greeting(self) -> Optional[str]:
|
||
if not self.llm_service:
|
||
return None
|
||
|
||
prompt_hint = (self._runtime_greeting or "").strip()
|
||
system_context = (self.conversation.system_prompt or self._runtime_system_prompt or "").strip()
|
||
# Keep context concise to avoid overloading greeting generation.
|
||
if len(system_context) > 1200:
|
||
system_context = system_context[:1200]
|
||
system_prompt = (
|
||
"你是语音通话助手的开场白生成器。"
|
||
"请只输出一句自然、简洁、友好的中文开场白。"
|
||
"不要使用引号，不要使用 markdown，不要加解释。"
|
||
)
|
||
user_prompt = "请生成一句中文开场白（不超过25个汉字）。"
|
||
if system_context:
|
||
user_prompt += f"\n\n以下是该助手的系统提示词，请据此决定语气、角色和边界：\n{system_context}"
|
||
if prompt_hint:
|
||
user_prompt += f"\n\n额外风格提示：{prompt_hint}"
|
||
|
||
try:
|
||
generated = await self.llm_service.generate(
|
||
[
|
||
LLMMessage(role="system", content=system_prompt),
|
||
LLMMessage(role="user", content=user_prompt),
|
||
],
|
||
temperature=0.7,
|
||
max_tokens=64,
|
||
)
|
||
except Exception as exc:
|
||
logger.warning(f"Failed to generate runtime greeting: {exc}")
|
||
return None
|
||
|
||
text = (generated or "").strip()
|
||
if not text:
|
||
return None
|
||
return text.strip().strip('"').strip("'")
|
||
|
||
async def start(self) -> None:
|
||
"""Start the pipeline and connect services."""
|
||
try:
|
||
# Connect LLM service
|
||
if not self.llm_service:
|
||
llm_api_key = self._runtime_llm.get("apiKey") or settings.openai_api_key
|
||
llm_base_url = self._runtime_llm.get("baseUrl") or settings.openai_api_url
|
||
llm_model = self._runtime_llm.get("model") or settings.llm_model
|
||
llm_provider = (self._runtime_llm.get("provider") or "openai").lower()
|
||
|
||
if llm_provider == "openai" and llm_api_key:
|
||
self.llm_service = OpenAILLMService(
|
||
api_key=llm_api_key,
|
||
base_url=llm_base_url,
|
||
model=llm_model,
|
||
knowledge_config=self._resolved_knowledge_config(),
|
||
)
|
||
else:
|
||
logger.warning("No OpenAI API key - using mock LLM")
|
||
self.llm_service = MockLLMService()
|
||
|
||
if hasattr(self.llm_service, "set_knowledge_config"):
|
||
self.llm_service.set_knowledge_config(self._resolved_knowledge_config())
|
||
if hasattr(self.llm_service, "set_tool_schemas"):
|
||
self.llm_service.set_tool_schemas(self._resolved_tool_schemas())
|
||
|
||
await self.llm_service.connect()
|
||
|
||
tts_output_enabled = self._tts_output_enabled()
|
||
|
||
# Connect TTS service only when audio output is enabled.
|
||
if tts_output_enabled:
|
||
if not self.tts_service:
|
||
tts_provider = (self._runtime_tts.get("provider") or settings.tts_provider).lower()
|
||
tts_api_key = self._runtime_tts.get("apiKey") or settings.siliconflow_api_key
|
||
tts_voice = self._runtime_tts.get("voice") or settings.tts_voice
|
||
tts_model = self._runtime_tts.get("model") or settings.siliconflow_tts_model
|
||
tts_speed = float(self._runtime_tts.get("speed") or settings.tts_speed)
|
||
|
||
if tts_provider == "siliconflow" and tts_api_key:
|
||
self.tts_service = SiliconFlowTTSService(
|
||
api_key=tts_api_key,
|
||
voice=tts_voice,
|
||
model=tts_model,
|
||
sample_rate=settings.sample_rate,
|
||
speed=tts_speed
|
||
)
|
||
logger.info("Using SiliconFlow TTS service")
|
||
else:
|
||
self.tts_service = EdgeTTSService(
|
||
voice=tts_voice,
|
||
sample_rate=settings.sample_rate
|
||
)
|
||
logger.info("Using Edge TTS service")
|
||
|
||
try:
|
||
await self.tts_service.connect()
|
||
except Exception as e:
|
||
logger.warning(f"TTS backend unavailable ({e}); falling back to MockTTS")
|
||
self.tts_service = MockTTSService(
|
||
sample_rate=settings.sample_rate
|
||
)
|
||
await self.tts_service.connect()
|
||
else:
|
||
self.tts_service = None
|
||
logger.info("TTS output disabled by runtime metadata")
|
||
|
||
# Connect ASR service
|
||
if not self.asr_service:
|
||
asr_provider = (self._runtime_asr.get("provider") or settings.asr_provider).lower()
|
||
asr_api_key = self._runtime_asr.get("apiKey") or settings.siliconflow_api_key
|
||
asr_model = self._runtime_asr.get("model") or settings.siliconflow_asr_model
|
||
asr_interim_interval = int(self._runtime_asr.get("interimIntervalMs") or settings.asr_interim_interval_ms)
|
||
asr_min_audio_ms = int(self._runtime_asr.get("minAudioMs") or settings.asr_min_audio_ms)
|
||
|
||
if asr_provider == "siliconflow" and asr_api_key:
|
||
self.asr_service = SiliconFlowASRService(
|
||
api_key=asr_api_key,
|
||
model=asr_model,
|
||
sample_rate=settings.sample_rate,
|
||
interim_interval_ms=asr_interim_interval,
|
||
min_audio_for_interim_ms=asr_min_audio_ms,
|
||
on_transcript=self._on_transcript_callback
|
||
)
|
||
logger.info("Using SiliconFlow ASR service")
|
||
else:
|
||
self.asr_service = BufferedASRService(
|
||
sample_rate=settings.sample_rate
|
||
)
|
||
logger.info("Using Buffered ASR service (no real transcription)")
|
||
|
||
await self.asr_service.connect()
|
||
|
||
logger.info("DuplexPipeline services connected")
|
||
if not self._outbound_task or self._outbound_task.done():
|
||
self._outbound_task = asyncio.create_task(self._outbound_loop())
|
||
|
||
# Resolve greeting once per session start.
|
||
# Always emit text opener event so text-only sessions can display it.
|
||
if self._bot_starts_first():
|
||
greeting_to_speak = self.conversation.greeting
|
||
if self._generated_opener_enabled():
|
||
generated_greeting = await self._generate_runtime_greeting()
|
||
if generated_greeting:
|
||
greeting_to_speak = generated_greeting
|
||
self.conversation.greeting = generated_greeting
|
||
if greeting_to_speak:
|
||
await self._send_event(
|
||
ev(
|
||
"assistant.response.final",
|
||
text=greeting_to_speak,
|
||
trackId=self.session_id,
|
||
),
|
||
priority=20,
|
||
)
|
||
if tts_output_enabled:
|
||
await self._speak(greeting_to_speak)
|
||
|
||
except Exception as e:
|
||
logger.error(f"Failed to start pipeline: {e}")
|
||
raise
|
||
|
||
async def _enqueue_outbound(self, kind: str, payload: Any, priority: int) -> None:
|
||
"""Queue outbound message with priority ordering."""
|
||
self._outbound_seq += 1
|
||
await self._outbound_q.put((priority, self._outbound_seq, kind, payload))
|
||
|
||
async def _send_event(self, event: Dict[str, Any], priority: int = 20) -> None:
|
||
await self._enqueue_outbound("event", event, priority)
|
||
|
||
async def _send_audio(self, pcm_bytes: bytes, priority: int = 50) -> None:
|
||
await self._enqueue_outbound("audio", pcm_bytes, priority)
|
||
|
||
async def _outbound_loop(self) -> None:
|
||
"""Single sender loop that enforces priority for interrupt events."""
|
||
while True:
|
||
_priority, _seq, kind, payload = await self._outbound_q.get()
|
||
try:
|
||
if kind == "stop":
|
||
return
|
||
if kind == "audio":
|
||
if self._drop_outbound_audio:
|
||
continue
|
||
await self.transport.send_audio(payload)
|
||
elif kind == "event":
|
||
await self.transport.send_event(payload)
|
||
except Exception as e:
|
||
logger.error(f"Outbound send error ({kind}): {e}")
|
||
finally:
|
||
self._outbound_q.task_done()
|
||
|
||
async def process_audio(self, pcm_bytes: bytes) -> None:
|
||
"""
|
||
Process incoming audio chunk.
|
||
|
||
This is the main entry point for audio from the user.
|
||
|
||
Args:
|
||
pcm_bytes: PCM audio data (16-bit, mono, 16kHz)
|
||
"""
|
||
if not self._running:
|
||
return
|
||
|
||
try:
|
||
async with self._process_lock:
|
||
if pcm_bytes:
|
||
self._pre_speech_buffer += pcm_bytes
|
||
if len(self._pre_speech_buffer) > self._asr_pre_speech_bytes:
|
||
self._pre_speech_buffer = self._pre_speech_buffer[-self._asr_pre_speech_bytes:]
|
||
|
||
# 1. Process through VAD
|
||
vad_result = self.vad_processor.process(pcm_bytes, settings.chunk_size_ms)
|
||
|
||
vad_status = "Silence"
|
||
if vad_result:
|
||
event_type, probability = vad_result
|
||
vad_status = "Speech" if event_type == "speaking" else "Silence"
|
||
|
||
# Emit VAD event
|
||
await self.event_bus.publish(event_type, {
|
||
"trackId": self.session_id,
|
||
"probability": probability
|
||
})
|
||
await self._send_event(
|
||
ev(
|
||
"input.speech_started" if event_type == "speaking" else "input.speech_stopped",
|
||
trackId=self.session_id,
|
||
probability=probability,
|
||
),
|
||
priority=30,
|
||
)
|
||
else:
|
||
# No state change - keep previous status
|
||
vad_status = self._last_vad_status
|
||
|
||
# Update state based on VAD
|
||
if vad_status == "Speech" and self._last_vad_status != "Speech":
|
||
await self._on_speech_start(current_chunk=pcm_bytes)
|
||
|
||
self._last_vad_status = vad_status
|
||
|
||
# 2. Check for barge-in (user speaking while bot speaking)
|
||
# Filter false interruptions by requiring minimum speech duration
|
||
if self._is_bot_speaking and self._barge_in_enabled():
|
||
if vad_status == "Speech":
|
||
# User is speaking while bot is speaking
|
||
self._barge_in_silence_frames = 0 # Reset silence counter
|
||
|
||
if self._barge_in_speech_start_time is None:
|
||
# Start tracking speech duration
|
||
self._barge_in_speech_start_time = time.time()
|
||
self._barge_in_speech_frames = 1
|
||
logger.debug("Potential barge-in detected, tracking duration...")
|
||
else:
|
||
self._barge_in_speech_frames += 1
|
||
# Check if speech duration exceeds threshold
|
||
speech_duration_ms = (time.time() - self._barge_in_speech_start_time) * 1000
|
||
if speech_duration_ms >= self._resolved_barge_in_min_duration_ms():
|
||
logger.info(f"Barge-in confirmed after {speech_duration_ms:.0f}ms of speech ({self._barge_in_speech_frames} frames)")
|
||
await self._handle_barge_in()
|
||
else:
|
||
# Silence frame during potential barge-in
|
||
if self._barge_in_speech_start_time is not None:
|
||
self._barge_in_silence_frames += 1
|
||
# Allow brief silence gaps (VAD flickering)
|
||
if self._barge_in_silence_frames > self._barge_in_silence_tolerance:
|
||
# Too much silence - reset barge-in tracking
|
||
logger.debug(f"Barge-in cancelled after {self._barge_in_silence_frames} silence frames")
|
||
self._barge_in_speech_start_time = None
|
||
self._barge_in_speech_frames = 0
|
||
self._barge_in_silence_frames = 0
|
||
elif self._is_bot_speaking and not self._barge_in_enabled():
|
||
self._barge_in_speech_start_time = None
|
||
self._barge_in_speech_frames = 0
|
||
self._barge_in_silence_frames = 0
|
||
|
||
# 3. Buffer audio for ASR
|
||
if vad_status == "Speech" or self.conversation.state == ConversationState.LISTENING:
|
||
self._audio_buffer += pcm_bytes
|
||
if len(self._audio_buffer) > self._max_audio_buffer_bytes:
|
||
# Keep only the most recent audio to cap memory usage
|
||
self._audio_buffer = self._audio_buffer[-self._max_audio_buffer_bytes:]
|
||
await self.asr_service.send_audio(pcm_bytes)
|
||
|
||
# For SiliconFlow ASR, trigger interim transcription periodically
|
||
# The service handles timing internally via start_interim_transcription()
|
||
|
||
# 4. Check for End of Utterance - this triggers LLM response
|
||
if self.eou_detector.process(vad_status):
|
||
await self._on_end_of_utterance()
|
||
|
||
except Exception as e:
|
||
logger.error(f"Pipeline audio processing error: {e}", exc_info=True)
|
||
|
||
async def process_text(self, text: str) -> None:
|
||
"""
|
||
Process text input (chat command).
|
||
|
||
Allows direct text input to bypass ASR.
|
||
|
||
Args:
|
||
text: User text input
|
||
"""
|
||
if not self._running:
|
||
return
|
||
|
||
logger.info(f"Processing text input: {text[:50]}...")
|
||
|
||
# Cancel any current speaking
|
||
await self._stop_current_speech()
|
||
|
||
# Start new turn
|
||
await self.conversation.end_user_turn(text)
|
||
self._current_turn_task = asyncio.create_task(self._handle_turn(text))
|
||
|
||
async def interrupt(self) -> None:
|
||
"""Interrupt current bot speech (manual interrupt command)."""
|
||
await self._handle_barge_in()
|
||
|
||
async def _on_transcript_callback(self, text: str, is_final: bool) -> None:
|
||
"""
|
||
Callback for ASR transcription results.
|
||
|
||
Streams transcription to client for display.
|
||
|
||
Args:
|
||
text: Transcribed text
|
||
is_final: Whether this is the final transcription
|
||
"""
|
||
# Avoid sending duplicate transcripts
|
||
if text == self._last_sent_transcript and not is_final:
|
||
return
|
||
|
||
self._last_sent_transcript = text
|
||
|
||
# Send transcript event to client
|
||
await self._send_event({
|
||
**ev(
|
||
"transcript.final" if is_final else "transcript.delta",
|
||
trackId=self.session_id,
|
||
text=text,
|
||
)
|
||
}, priority=30)
|
||
|
||
if not is_final:
|
||
logger.info(f"[ASR] ASR interim: {text[:100]}")
|
||
logger.debug(f"Sent transcript ({'final' if is_final else 'interim'}): {text[:50]}...")
|
||
|
||
async def _on_speech_start(self, current_chunk: bytes = b"") -> None:
|
||
"""Handle user starting to speak."""
|
||
if self.conversation.state in (ConversationState.IDLE, ConversationState.INTERRUPTED):
|
||
await self.conversation.start_user_turn()
|
||
self._audio_buffer = b""
|
||
self._last_sent_transcript = ""
|
||
self.eou_detector.reset()
|
||
|
||
# Clear ASR buffer and start interim transcriptions
|
||
if hasattr(self.asr_service, 'clear_buffer'):
|
||
self.asr_service.clear_buffer()
|
||
if hasattr(self.asr_service, 'start_interim_transcription'):
|
||
await self.asr_service.start_interim_transcription()
|
||
# Prime ASR with a short pre-speech context window so the utterance
|
||
# start isn't lost while waiting for VAD to transition to Speech.
|
||
pre_roll = self._pre_speech_buffer
|
||
if current_chunk and len(pre_roll) > len(current_chunk):
|
||
pre_roll = pre_roll[:-len(current_chunk)]
|
||
elif current_chunk:
|
||
pre_roll = b""
|
||
if pre_roll:
|
||
await self.asr_service.send_audio(pre_roll)
|
||
self._audio_buffer = pre_roll
|
||
|
||
logger.debug("User speech started")
|
||
|
||
async def _on_end_of_utterance(self) -> None:
|
||
"""Handle end of user utterance."""
|
||
if self.conversation.state not in (ConversationState.LISTENING, ConversationState.INTERRUPTED):
|
||
return
|
||
|
||
# Add a tiny trailing silence tail to stabilize final-token decoding.
|
||
if self._asr_final_tail_bytes > 0:
|
||
final_tail = b"\x00" * self._asr_final_tail_bytes
|
||
await self.asr_service.send_audio(final_tail)
|
||
|
||
# Stop interim transcriptions
|
||
if hasattr(self.asr_service, 'stop_interim_transcription'):
|
||
await self.asr_service.stop_interim_transcription()
|
||
|
||
# Get final transcription from ASR service
|
||
user_text = ""
|
||
|
||
if hasattr(self.asr_service, 'get_final_transcription'):
|
||
# SiliconFlow ASR - get final transcription
|
||
user_text = await self.asr_service.get_final_transcription()
|
||
elif hasattr(self.asr_service, 'get_and_clear_text'):
|
||
# Buffered ASR - get accumulated text
|
||
user_text = self.asr_service.get_and_clear_text()
|
||
|
||
# Skip if no meaningful text
|
||
if not user_text or not user_text.strip():
|
||
logger.debug("[EOU] Detected but no transcription - skipping")
|
||
# Reset for next utterance
|
||
self._audio_buffer = b""
|
||
self._last_sent_transcript = ""
|
||
# Return to idle; don't force LISTENING which causes buffering on silence
|
||
await self.conversation.set_state(ConversationState.IDLE)
|
||
return
|
||
|
||
logger.info(f"[EOU] Detected - user said: {user_text[:100]}...")
|
||
|
||
# For ASR backends that already emitted final via callback,
|
||
# avoid duplicating transcript.final on EOU.
|
||
if user_text != self._last_sent_transcript:
|
||
await self._send_event({
|
||
**ev(
|
||
"transcript.final",
|
||
trackId=self.session_id,
|
||
text=user_text,
|
||
)
|
||
}, priority=25)
|
||
|
||
# Clear buffers
|
||
self._audio_buffer = b""
|
||
self._last_sent_transcript = ""
|
||
|
||
# Process the turn - trigger LLM response
|
||
# Cancel any existing turn to avoid overlapping assistant responses
|
||
await self._stop_current_speech()
|
||
await self.conversation.end_user_turn(user_text)
|
||
self._current_turn_task = asyncio.create_task(self._handle_turn(user_text))
|
||
|
||
def _resolved_knowledge_config(self) -> Dict[str, Any]:
|
||
cfg: Dict[str, Any] = {}
|
||
if isinstance(self._runtime_knowledge, dict):
|
||
cfg.update(self._runtime_knowledge)
|
||
kb_id = self._runtime_knowledge_base_id or str(
|
||
cfg.get("kbId") or cfg.get("knowledgeBaseId") or ""
|
||
).strip()
|
||
if kb_id:
|
||
cfg["kbId"] = kb_id
|
||
cfg.setdefault("enabled", True)
|
||
return cfg
|
||
|
||
def _resolved_tool_schemas(self) -> List[Dict[str, Any]]:
|
||
schemas: List[Dict[str, Any]] = []
|
||
for item in self._runtime_tools:
|
||
if isinstance(item, str):
|
||
base = self._DEFAULT_TOOL_SCHEMAS.get(item)
|
||
if base:
|
||
schemas.append(
|
||
{
|
||
"type": "function",
|
||
"function": {
|
||
"name": base["name"],
|
||
"description": base.get("description") or "",
|
||
"parameters": base.get("parameters") or {"type": "object", "properties": {}},
|
||
},
|
||
}
|
||
)
|
||
continue
|
||
|
||
if not isinstance(item, dict):
|
||
continue
|
||
|
||
fn = item.get("function")
|
||
if isinstance(fn, dict) and fn.get("name"):
|
||
fn_name = str(fn.get("name"))
|
||
executor = str(item.get("executor") or item.get("run_on") or "").strip().lower()
|
||
if executor in {"client", "server"}:
|
||
self._runtime_tool_executor[fn_name] = executor
|
||
schemas.append(
|
||
{
|
||
"type": "function",
|
||
"function": {
|
||
"name": str(fn.get("name")),
|
||
"description": str(fn.get("description") or item.get("description") or ""),
|
||
"parameters": fn.get("parameters") or {"type": "object", "properties": {}},
|
||
},
|
||
}
|
||
)
|
||
continue
|
||
|
||
if item.get("name"):
|
||
fn_name = str(item.get("name"))
|
||
executor = str(item.get("executor") or item.get("run_on") or "").strip().lower()
|
||
if executor in {"client", "server"}:
|
||
self._runtime_tool_executor[fn_name] = executor
|
||
schemas.append(
|
||
{
|
||
"type": "function",
|
||
"function": {
|
||
"name": str(item.get("name")),
|
||
"description": str(item.get("description") or ""),
|
||
"parameters": item.get("parameters") or {"type": "object", "properties": {}},
|
||
},
|
||
}
|
||
)
|
||
return schemas
|
||
|
||
def _resolved_tool_executor_map(self) -> Dict[str, str]:
|
||
result: Dict[str, str] = {}
|
||
for item in self._runtime_tools:
|
||
if not isinstance(item, dict):
|
||
continue
|
||
fn = item.get("function")
|
||
if isinstance(fn, dict) and fn.get("name"):
|
||
name = str(fn.get("name"))
|
||
else:
|
||
name = str(item.get("name") or "").strip()
|
||
if not name:
|
||
continue
|
||
executor = str(item.get("executor") or item.get("run_on") or "").strip().lower()
|
||
if executor in {"client", "server"}:
|
||
result[name] = executor
|
||
return result
|
||
|
||
def _tool_name(self, tool_call: Dict[str, Any]) -> str:
|
||
fn = tool_call.get("function")
|
||
if isinstance(fn, dict):
|
||
return str(fn.get("name") or "").strip()
|
||
return ""
|
||
|
||
def _tool_executor(self, tool_call: Dict[str, Any]) -> str:
|
||
name = self._tool_name(tool_call)
|
||
if name and name in self._runtime_tool_executor:
|
||
return self._runtime_tool_executor[name]
|
||
# Default to server execution unless explicitly marked as client.
|
||
return "server"
|
||
|
||
async def _emit_tool_result(self, result: Dict[str, Any], source: str) -> None:
|
||
await self._send_event(
|
||
{
|
||
**ev(
|
||
"assistant.tool_result",
|
||
trackId=self.session_id,
|
||
source=source,
|
||
result=result,
|
||
)
|
||
},
|
||
priority=22,
|
||
)
|
||
|
||
async def handle_tool_call_results(self, results: List[Dict[str, Any]]) -> None:
|
||
"""Handle client tool execution results."""
|
||
if not isinstance(results, list):
|
||
return
|
||
|
||
for item in results:
|
||
if not isinstance(item, dict):
|
||
continue
|
||
call_id = str(item.get("tool_call_id") or item.get("id") or "").strip()
|
||
if not call_id:
|
||
continue
|
||
if call_id in self._completed_tool_call_ids:
|
||
continue
|
||
|
||
waiter = self._pending_tool_waiters.get(call_id)
|
||
if waiter and not waiter.done():
|
||
waiter.set_result(item)
|
||
self._completed_tool_call_ids.add(call_id)
|
||
continue
|
||
self._early_tool_results[call_id] = item
|
||
self._completed_tool_call_ids.add(call_id)
|
||
|
||
async def _wait_for_single_tool_result(self, call_id: str) -> Dict[str, Any]:
|
||
if call_id in self._completed_tool_call_ids and call_id not in self._early_tool_results:
|
||
return {
|
||
"tool_call_id": call_id,
|
||
"status": {"code": 208, "message": "tool_call result already handled"},
|
||
"output": "",
|
||
}
|
||
if call_id in self._early_tool_results:
|
||
self._completed_tool_call_ids.add(call_id)
|
||
return self._early_tool_results.pop(call_id)
|
||
|
||
loop = asyncio.get_running_loop()
|
||
future = loop.create_future()
|
||
self._pending_tool_waiters[call_id] = future
|
||
try:
|
||
return await asyncio.wait_for(future, timeout=self._TOOL_WAIT_TIMEOUT_SECONDS)
|
||
except asyncio.TimeoutError:
|
||
self._completed_tool_call_ids.add(call_id)
|
||
return {
|
||
"tool_call_id": call_id,
|
||
"status": {"code": 504, "message": "tool_call timeout"},
|
||
"output": "",
|
||
}
|
||
finally:
|
||
self._pending_tool_waiters.pop(call_id, None)
|
||
|
||
def _normalize_stream_event(self, item: Any) -> LLMStreamEvent:
|
||
if isinstance(item, LLMStreamEvent):
|
||
return item
|
||
if isinstance(item, str):
|
||
return LLMStreamEvent(type="text_delta", text=item)
|
||
if isinstance(item, dict):
|
||
event_type = str(item.get("type") or "")
|
||
if event_type in {"text_delta", "tool_call", "done"}:
|
||
return LLMStreamEvent(
|
||
type=event_type, # type: ignore[arg-type]
|
||
text=item.get("text"),
|
||
tool_call=item.get("tool_call"),
|
||
)
|
||
return LLMStreamEvent(type="done")
|
||
|
||
async def _handle_turn(self, user_text: str) -> None:
|
||
"""
|
||
Handle a complete conversation turn.
|
||
|
||
Uses sentence-by-sentence streaming TTS for lower latency.
|
||
|
||
Args:
|
||
user_text: User's transcribed text
|
||
"""
|
||
try:
|
||
# Start latency tracking
|
||
self._turn_start_time = time.time()
|
||
self._first_audio_sent = False
|
||
|
||
full_response = ""
|
||
messages = self.conversation.get_messages()
|
||
max_rounds = 3
|
||
|
||
await self.conversation.start_assistant_turn()
|
||
self._is_bot_speaking = True
|
||
self._interrupt_event.clear()
|
||
self._drop_outbound_audio = False
|
||
|
||
first_audio_sent = False
|
||
for _ in range(max_rounds):
|
||
if self._interrupt_event.is_set():
|
||
break
|
||
|
||
sentence_buffer = ""
|
||
pending_punctuation = ""
|
||
round_response = ""
|
||
tool_calls: List[Dict[str, Any]] = []
|
||
allow_text_output = True
|
||
|
||
async for raw_event in self.llm_service.generate_stream(messages):
|
||
if self._interrupt_event.is_set():
|
||
break
|
||
|
||
event = self._normalize_stream_event(raw_event)
|
||
if event.type == "tool_call":
|
||
tool_call = event.tool_call if isinstance(event.tool_call, dict) else None
|
||
if not tool_call:
|
||
continue
|
||
allow_text_output = False
|
||
executor = self._tool_executor(tool_call)
|
||
enriched_tool_call = dict(tool_call)
|
||
enriched_tool_call["executor"] = executor
|
||
tool_calls.append(enriched_tool_call)
|
||
await self._send_event(
|
||
{
|
||
**ev(
|
||
"assistant.tool_call",
|
||
trackId=self.session_id,
|
||
tool_call=enriched_tool_call,
|
||
)
|
||
},
|
||
priority=22,
|
||
)
|
||
continue
|
||
|
||
if event.type != "text_delta":
|
||
continue
|
||
|
||
text_chunk = event.text or ""
|
||
if not text_chunk:
|
||
continue
|
||
|
||
if not allow_text_output:
|
||
continue
|
||
|
||
full_response += text_chunk
|
||
round_response += text_chunk
|
||
sentence_buffer += text_chunk
|
||
await self.conversation.update_assistant_text(text_chunk)
|
||
|
||
await self._send_event(
|
||
{
|
||
**ev(
|
||
"assistant.response.delta",
|
||
trackId=self.session_id,
|
||
text=text_chunk,
|
||
)
|
||
},
|
||
# Keep delta/final on the same event priority so FIFO seq
|
||
# preserves stream order (avoid late-delta after final).
|
||
priority=20,
|
||
)
|
||
|
||
while True:
|
||
split_result = extract_tts_sentence(
|
||
sentence_buffer,
|
||
end_chars=self._SENTENCE_END_CHARS,
|
||
trailing_chars=self._SENTENCE_TRAILING_CHARS,
|
||
closers=self._SENTENCE_CLOSERS,
|
||
min_split_spoken_chars=self._MIN_SPLIT_SPOKEN_CHARS,
|
||
hold_trailing_at_buffer_end=True,
|
||
force=False,
|
||
)
|
||
if not split_result:
|
||
break
|
||
sentence, sentence_buffer = split_result
|
||
if not sentence:
|
||
continue
|
||
|
||
sentence = f"{pending_punctuation}{sentence}".strip()
|
||
pending_punctuation = ""
|
||
if not sentence:
|
||
continue
|
||
|
||
if not has_spoken_content(sentence):
|
||
pending_punctuation = sentence
|
||
continue
|
||
|
||
if self._tts_output_enabled() and not self._interrupt_event.is_set():
|
||
if not first_audio_sent:
|
||
await self._send_event(
|
||
{
|
||
**ev(
|
||
"output.audio.start",
|
||
trackId=self.session_id,
|
||
)
|
||
},
|
||
priority=10,
|
||
)
|
||
first_audio_sent = True
|
||
|
||
await self._speak_sentence(
|
||
sentence,
|
||
fade_in_ms=0,
|
||
fade_out_ms=8,
|
||
)
|
||
|
||
remaining_text = f"{pending_punctuation}{sentence_buffer}".strip()
|
||
if (
|
||
self._tts_output_enabled()
|
||
and remaining_text
|
||
and has_spoken_content(remaining_text)
|
||
and not self._interrupt_event.is_set()
|
||
):
|
||
if not first_audio_sent:
|
||
await self._send_event(
|
||
{
|
||
**ev(
|
||
"output.audio.start",
|
||
trackId=self.session_id,
|
||
)
|
||
},
|
||
priority=10,
|
||
)
|
||
first_audio_sent = True
|
||
await self._speak_sentence(
|
||
remaining_text,
|
||
fade_in_ms=0,
|
||
fade_out_ms=8,
|
||
)
|
||
|
||
if not tool_calls:
|
||
break
|
||
|
||
tool_results: List[Dict[str, Any]] = []
|
||
for call in tool_calls:
|
||
call_id = str(call.get("id") or "").strip()
|
||
if not call_id:
|
||
continue
|
||
executor = str(call.get("executor") or "server").strip().lower()
|
||
if executor == "client":
|
||
result = await self._wait_for_single_tool_result(call_id)
|
||
await self._emit_tool_result(result, source="client")
|
||
tool_results.append(result)
|
||
continue
|
||
|
||
try:
|
||
result = await asyncio.wait_for(
|
||
execute_server_tool(call),
|
||
timeout=self._SERVER_TOOL_TIMEOUT_SECONDS,
|
||
)
|
||
except asyncio.TimeoutError:
|
||
result = {
|
||
"tool_call_id": call_id,
|
||
"name": self._tool_name(call) or "unknown_tool",
|
||
"output": {"message": "server tool timeout"},
|
||
"status": {"code": 504, "message": "server_tool_timeout"},
|
||
}
|
||
await self._emit_tool_result(result, source="server")
|
||
tool_results.append(result)
|
||
|
||
messages = [
|
||
*messages,
|
||
LLMMessage(
|
||
role="assistant",
|
||
content=round_response.strip(),
|
||
),
|
||
LLMMessage(
|
||
role="system",
|
||
content=(
|
||
"Tool execution results are available. "
|
||
"Continue answering the user naturally using these results. "
|
||
"Do not request the same tool again in this turn.\n"
|
||
f"tool_calls={json.dumps(tool_calls, ensure_ascii=False)}\n"
|
||
f"tool_results={json.dumps(tool_results, ensure_ascii=False)}"
|
||
),
|
||
),
|
||
]
|
||
|
||
if full_response and not self._interrupt_event.is_set():
|
||
await self._send_event(
|
||
{
|
||
**ev(
|
||
"assistant.response.final",
|
||
trackId=self.session_id,
|
||
text=full_response,
|
||
)
|
||
},
|
||
priority=20,
|
||
)
|
||
|
||
# Send track end
|
||
if first_audio_sent:
|
||
await self._send_event({
|
||
**ev(
|
||
"output.audio.end",
|
||
trackId=self.session_id,
|
||
)
|
||
}, priority=10)
|
||
|
||
# End assistant turn
|
||
await self.conversation.end_assistant_turn(
|
||
was_interrupted=self._interrupt_event.is_set()
|
||
)
|
||
|
||
except asyncio.CancelledError:
|
||
logger.info("Turn handling cancelled")
|
||
await self.conversation.end_assistant_turn(was_interrupted=True)
|
||
except Exception as e:
|
||
logger.error(f"Turn handling error: {e}", exc_info=True)
|
||
await self.conversation.end_assistant_turn(was_interrupted=True)
|
||
finally:
|
||
self._is_bot_speaking = False
|
||
# Reset barge-in tracking when bot finishes speaking
|
||
self._barge_in_speech_start_time = None
|
||
self._barge_in_speech_frames = 0
|
||
self._barge_in_silence_frames = 0
|
||
|
||
async def _speak_sentence(self, text: str, fade_in_ms: int = 0, fade_out_ms: int = 8) -> None:
|
||
"""
|
||
Synthesize and send a single sentence.
|
||
|
||
Args:
|
||
text: Sentence to speak
|
||
fade_in_ms: Fade-in duration for sentence start chunks
|
||
fade_out_ms: Fade-out duration for sentence end chunks
|
||
"""
|
||
if not self._tts_output_enabled():
|
||
return
|
||
|
||
if not text.strip() or self._interrupt_event.is_set() or not self.tts_service:
|
||
return
|
||
|
||
logger.info(f"[TTS] split sentence: {text!r}")
|
||
|
||
try:
|
||
is_first_chunk = True
|
||
async for chunk in self.tts_service.synthesize_stream(text):
|
||
# Check interrupt at the start of each iteration
|
||
if self._interrupt_event.is_set():
|
||
logger.debug("TTS sentence interrupted")
|
||
break
|
||
|
||
# Track and log first audio packet latency (TTFB)
|
||
if not self._first_audio_sent and self._turn_start_time:
|
||
ttfb_ms = (time.time() - self._turn_start_time) * 1000
|
||
self._first_audio_sent = True
|
||
logger.info(f"[TTFB] Server first audio packet latency: {ttfb_ms:.0f}ms (session {self.session_id})")
|
||
|
||
# Send TTFB event to client
|
||
await self._send_event({
|
||
**ev(
|
||
"metrics.ttfb",
|
||
trackId=self.session_id,
|
||
latencyMs=round(ttfb_ms),
|
||
)
|
||
}, priority=25)
|
||
|
||
# Double-check interrupt right before sending audio
|
||
if self._interrupt_event.is_set():
|
||
break
|
||
|
||
smoothed_audio = self._apply_edge_fade(
|
||
pcm_bytes=chunk.audio,
|
||
sample_rate=chunk.sample_rate,
|
||
fade_in=is_first_chunk,
|
||
fade_out=bool(chunk.is_final),
|
||
fade_in_ms=fade_in_ms,
|
||
fade_out_ms=fade_out_ms,
|
||
)
|
||
is_first_chunk = False
|
||
|
||
await self._send_audio(smoothed_audio, priority=50)
|
||
except asyncio.CancelledError:
|
||
logger.debug("TTS sentence cancelled")
|
||
except Exception as e:
|
||
logger.error(f"TTS sentence error: {e}")
|
||
|
||
def _apply_edge_fade(
|
||
self,
|
||
pcm_bytes: bytes,
|
||
sample_rate: int,
|
||
fade_in: bool = False,
|
||
fade_out: bool = False,
|
||
fade_in_ms: int = 0,
|
||
fade_out_ms: int = 8,
|
||
) -> bytes:
|
||
"""Apply short edge fades to reduce click/pop at sentence boundaries."""
|
||
if not pcm_bytes or (not fade_in and not fade_out):
|
||
return pcm_bytes
|
||
|
||
try:
|
||
samples = np.frombuffer(pcm_bytes, dtype="<i2").astype(np.float32)
|
||
if samples.size == 0:
|
||
return pcm_bytes
|
||
|
||
if fade_in and fade_in_ms > 0:
|
||
fade_in_samples = int(sample_rate * (fade_in_ms / 1000.0))
|
||
fade_in_samples = max(1, min(fade_in_samples, samples.size))
|
||
samples[:fade_in_samples] *= np.linspace(0.0, 1.0, fade_in_samples, endpoint=True)
|
||
if fade_out:
|
||
fade_out_samples = int(sample_rate * (fade_out_ms / 1000.0))
|
||
fade_out_samples = max(1, min(fade_out_samples, samples.size))
|
||
samples[-fade_out_samples:] *= np.linspace(1.0, 0.0, fade_out_samples, endpoint=True)
|
||
|
||
return np.clip(samples, -32768, 32767).astype("<i2").tobytes()
|
||
except Exception:
|
||
# Fallback: never block audio delivery on smoothing failure.
|
||
return pcm_bytes
|
||
|
||
async def _speak(self, text: str) -> None:
|
||
"""
|
||
Synthesize and send speech.
|
||
|
||
Args:
|
||
text: Text to speak
|
||
"""
|
||
if not self._tts_output_enabled():
|
||
return
|
||
|
||
if not text.strip() or not self.tts_service:
|
||
return
|
||
|
||
try:
|
||
self._drop_outbound_audio = False
|
||
# Start latency tracking for greeting
|
||
speak_start_time = time.time()
|
||
first_audio_sent = False
|
||
|
||
# Send track start event
|
||
await self._send_event({
|
||
**ev(
|
||
"output.audio.start",
|
||
trackId=self.session_id,
|
||
)
|
||
}, priority=10)
|
||
|
||
self._is_bot_speaking = True
|
||
|
||
# Stream TTS audio
|
||
async for chunk in self.tts_service.synthesize_stream(text):
|
||
if self._interrupt_event.is_set():
|
||
logger.info("TTS interrupted by barge-in")
|
||
break
|
||
|
||
# Track and log first audio packet latency (TTFB)
|
||
if not first_audio_sent:
|
||
ttfb_ms = (time.time() - speak_start_time) * 1000
|
||
first_audio_sent = True
|
||
logger.info(f"[TTFB] Greeting first audio packet latency: {ttfb_ms:.0f}ms (session {self.session_id})")
|
||
|
||
# Send TTFB event to client
|
||
await self._send_event({
|
||
**ev(
|
||
"metrics.ttfb",
|
||
trackId=self.session_id,
|
||
latencyMs=round(ttfb_ms),
|
||
)
|
||
}, priority=25)
|
||
|
||
# Send audio to client
|
||
await self._send_audio(chunk.audio, priority=50)
|
||
|
||
# Small delay to prevent flooding
|
||
await asyncio.sleep(0.01)
|
||
|
||
# Send track end event
|
||
await self._send_event({
|
||
**ev(
|
||
"output.audio.end",
|
||
trackId=self.session_id,
|
||
)
|
||
}, priority=10)
|
||
|
||
except asyncio.CancelledError:
|
||
logger.info("TTS cancelled")
|
||
raise
|
||
except Exception as e:
|
||
logger.error(f"TTS error: {e}")
|
||
finally:
|
||
self._is_bot_speaking = False
|
||
|
||
async def _handle_barge_in(self) -> None:
|
||
"""Handle user barge-in (interruption)."""
|
||
if not self._is_bot_speaking:
|
||
return
|
||
|
||
logger.info("Barge-in detected - interrupting bot speech")
|
||
|
||
# Reset barge-in tracking
|
||
self._barge_in_speech_start_time = None
|
||
self._barge_in_speech_frames = 0
|
||
self._barge_in_silence_frames = 0
|
||
|
||
# IMPORTANT: Signal interruption FIRST to stop audio sending
|
||
self._interrupt_event.set()
|
||
self._is_bot_speaking = False
|
||
self._drop_outbound_audio = True
|
||
|
||
# Send interrupt event to client IMMEDIATELY
|
||
# This must happen BEFORE canceling services, so client knows to discard in-flight audio
|
||
await self._send_event({
|
||
**ev(
|
||
"response.interrupted",
|
||
trackId=self.session_id,
|
||
)
|
||
}, priority=0)
|
||
|
||
# Cancel TTS
|
||
if self.tts_service:
|
||
await self.tts_service.cancel()
|
||
|
||
# Cancel LLM
|
||
if self.llm_service and hasattr(self.llm_service, 'cancel'):
|
||
self.llm_service.cancel()
|
||
|
||
# Interrupt conversation only if there is no active turn task.
|
||
# When a turn task exists, it will handle end_assistant_turn() to avoid double callbacks.
|
||
if not (self._current_turn_task and not self._current_turn_task.done()):
|
||
await self.conversation.interrupt()
|
||
|
||
# Reset for new user turn
|
||
await self.conversation.start_user_turn()
|
||
self._audio_buffer = b""
|
||
self.eou_detector.reset()
|
||
|
||
async def _stop_current_speech(self) -> None:
|
||
"""Stop any current speech task."""
|
||
self._drop_outbound_audio = True
|
||
if self._current_turn_task and not self._current_turn_task.done():
|
||
self._interrupt_event.set()
|
||
self._current_turn_task.cancel()
|
||
try:
|
||
await self._current_turn_task
|
||
except asyncio.CancelledError:
|
||
pass
|
||
|
||
# Ensure underlying services are cancelled to avoid leaking work/audio
|
||
if self.tts_service:
|
||
await self.tts_service.cancel()
|
||
if self.llm_service and hasattr(self.llm_service, 'cancel'):
|
||
self.llm_service.cancel()
|
||
|
||
self._is_bot_speaking = False
|
||
self._interrupt_event.clear()
|
||
|
||
async def cleanup(self) -> None:
|
||
"""Cleanup pipeline resources."""
|
||
logger.info(f"Cleaning up DuplexPipeline for session {self.session_id}")
|
||
|
||
self._running = False
|
||
await self._stop_current_speech()
|
||
if self._outbound_task and not self._outbound_task.done():
|
||
await self._enqueue_outbound("stop", None, priority=-1000)
|
||
await self._outbound_task
|
||
self._outbound_task = None
|
||
|
||
# Disconnect services
|
||
if self.llm_service:
|
||
await self.llm_service.disconnect()
|
||
if self.tts_service:
|
||
await self.tts_service.disconnect()
|
||
if self.asr_service:
|
||
await self.asr_service.disconnect()
|
||
|
||
def _get_timestamp_ms(self) -> int:
|
||
"""Get current timestamp in milliseconds."""
|
||
import time
|
||
return int(time.time() * 1000)
|
||
|
||
@property
|
||
def is_speaking(self) -> bool:
|
||
"""Check if bot is currently speaking."""
|
||
return self._is_bot_speaking
|
||
|
||
@property
|
||
def state(self) -> ConversationState:
|
||
"""Get current conversation state."""
|
||
return self.conversation.state
|