519 lines
20 KiB
Python
519 lines
20 KiB
Python
"""
|
|
Discord Voice Receiver using discord-ext-voice-recv
|
|
|
|
Captures audio from Discord voice channels and streams to STT.
|
|
Uses the discord-ext-voice-recv extension for proper audio receiving support.
|
|
"""
|
|
|
|
import asyncio
|
|
import audioop
|
|
import logging
|
|
from typing import Dict, Optional
|
|
from collections import deque
|
|
|
|
import discord
|
|
from discord.ext import voice_recv
|
|
|
|
from utils.stt_client import STTClient
|
|
|
|
logger = logging.getLogger('voice_receiver')
|
|
|
|
|
|
class VoiceReceiverSink(voice_recv.AudioSink):
|
|
"""
|
|
Audio sink that receives Discord audio and forwards to STT.
|
|
|
|
This sink processes incoming audio from Discord voice channels,
|
|
decodes/resamples as needed, and sends to STT clients for transcription.
|
|
"""
|
|
|
|
def __init__(self, voice_manager, stt_url: str = "ws://miku-stt:8766/ws/stt"):
|
|
"""
|
|
Initialize Voice Receiver.
|
|
|
|
Args:
|
|
voice_manager: The voice manager instance
|
|
stt_url: Base URL for STT WebSocket server with path (port 8766 inside container)
|
|
"""
|
|
super().__init__()
|
|
self.voice_manager = voice_manager
|
|
self.stt_url = stt_url
|
|
|
|
# Store event loop for thread-safe async calls
|
|
# Use get_running_loop() in async context, or store it when available
|
|
try:
|
|
self.loop = asyncio.get_running_loop()
|
|
except RuntimeError:
|
|
# Fallback if not in async context yet
|
|
self.loop = asyncio.get_event_loop()
|
|
|
|
# Per-user STT clients
|
|
self.stt_clients: Dict[int, STTClient] = {}
|
|
|
|
# Audio buffers per user (for resampling state)
|
|
self.audio_buffers: Dict[int, deque] = {}
|
|
|
|
# User info (for logging)
|
|
self.users: Dict[int, discord.User] = {}
|
|
|
|
# Silence tracking for detecting end of speech
|
|
self.last_audio_time: Dict[int, float] = {}
|
|
self.silence_tasks: Dict[int, asyncio.Task] = {}
|
|
self.silence_timeout = 1.0 # seconds of silence before sending "final"
|
|
|
|
# Interruption detection
|
|
self.interruption_start_time: Dict[int, float] = {}
|
|
self.interruption_audio_count: Dict[int, int] = {}
|
|
self.interruption_threshold_time = 0.8 # seconds of speech to count as interruption
|
|
self.interruption_threshold_chunks = 8 # minimum audio chunks to count as interruption
|
|
|
|
# Active flag
|
|
self.active = False
|
|
|
|
logger.info("VoiceReceiverSink initialized")
|
|
|
|
def wants_opus(self) -> bool:
|
|
"""
|
|
Tell discord-ext-voice-recv we want Opus data, NOT decoded PCM.
|
|
|
|
We'll decode it ourselves to avoid decoder errors from discord-ext-voice-recv.
|
|
|
|
Returns:
|
|
True - we want Opus packets, we'll handle decoding
|
|
"""
|
|
return True # Get Opus, decode ourselves to avoid packet router errors
|
|
|
|
def write(self, user: Optional[discord.User], data: voice_recv.VoiceData):
|
|
"""
|
|
Called by discord-ext-voice-recv when audio is received.
|
|
|
|
This is the main callback that receives audio packets from Discord.
|
|
We get Opus data, decode it ourselves, resample, and forward to STT.
|
|
|
|
Args:
|
|
user: Discord user who sent the audio (None if unknown)
|
|
data: Voice data container with pcm, opus, and packet info
|
|
"""
|
|
if not user:
|
|
return # Skip packets from unknown users
|
|
|
|
user_id = user.id
|
|
|
|
# Check if we're listening to this user
|
|
if user_id not in self.stt_clients:
|
|
return
|
|
|
|
try:
|
|
# Get Opus data (we decode ourselves to avoid PacketRouter errors)
|
|
opus_data = data.opus
|
|
|
|
if not opus_data:
|
|
return
|
|
|
|
# Decode Opus to PCM (48kHz stereo int16)
|
|
# Use discord.py's opus decoder with proper error handling
|
|
import discord.opus
|
|
if not hasattr(self, '_opus_decoders'):
|
|
self._opus_decoders = {}
|
|
|
|
# Create decoder for this user if needed
|
|
if user_id not in self._opus_decoders:
|
|
self._opus_decoders[user_id] = discord.opus.Decoder()
|
|
|
|
decoder = self._opus_decoders[user_id]
|
|
|
|
# Decode opus -> PCM (this can fail on corrupt packets, so catch it)
|
|
try:
|
|
pcm_data = decoder.decode(opus_data, fec=False)
|
|
except discord.opus.OpusError as e:
|
|
# Skip corrupted packets silently (common at stream start)
|
|
logger.debug(f"Skipping corrupted opus packet for user {user_id}: {e}")
|
|
return
|
|
|
|
if not pcm_data:
|
|
return
|
|
|
|
# PCM from Discord is 48kHz stereo int16
|
|
# Convert stereo to mono
|
|
if len(pcm_data) % 4 == 0: # Stereo (2 channels * 2 bytes per sample)
|
|
pcm_mono = audioop.tomono(pcm_data, 2, 0.5, 0.5)
|
|
else:
|
|
pcm_mono = pcm_data
|
|
|
|
# Resample from 48kHz to 16kHz for STT
|
|
# Discord sends 20ms chunks: 960 samples @ 48kHz → 320 samples @ 16kHz
|
|
pcm_16k, _ = audioop.ratecv(pcm_mono, 2, 1, 48000, 16000, None)
|
|
|
|
# Send to STT client (schedule on event loop thread-safely)
|
|
asyncio.run_coroutine_threadsafe(
|
|
self._send_audio_chunk(user_id, pcm_16k),
|
|
self.loop
|
|
)
|
|
|
|
except Exception as e:
|
|
logger.error(f"Error processing audio for user {user_id}: {e}", exc_info=True)
|
|
|
|
def cleanup(self):
|
|
"""
|
|
Called when the sink is stopped.
|
|
Cleanup any resources.
|
|
"""
|
|
logger.info("VoiceReceiverSink cleanup")
|
|
# Async cleanup handled separately in stop_all()
|
|
|
|
async def start_listening(self, user_id: int, user: discord.User):
|
|
"""
|
|
Start listening to a specific user.
|
|
|
|
Creates an STT client connection for this user and registers callbacks.
|
|
|
|
Args:
|
|
user_id: Discord user ID
|
|
user: Discord user object
|
|
"""
|
|
if user_id in self.stt_clients:
|
|
logger.warning(f"Already listening to user {user.name} ({user_id})")
|
|
return
|
|
|
|
logger.info(f"Starting to listen to user {user.name} ({user_id})")
|
|
|
|
# Store user info
|
|
self.users[user_id] = user
|
|
|
|
# Initialize audio buffer
|
|
self.audio_buffers[user_id] = deque(maxlen=1000)
|
|
|
|
# Create STT client with callbacks
|
|
stt_client = STTClient(
|
|
user_id=user_id,
|
|
stt_url=self.stt_url,
|
|
on_vad_event=lambda event: asyncio.create_task(
|
|
self._on_vad_event(user_id, event)
|
|
),
|
|
on_partial_transcript=lambda text, timestamp: asyncio.create_task(
|
|
self._on_partial_transcript(user_id, text)
|
|
),
|
|
on_final_transcript=lambda text, timestamp: asyncio.create_task(
|
|
self._on_final_transcript(user_id, text, user)
|
|
),
|
|
on_interruption=lambda prob: asyncio.create_task(
|
|
self._on_interruption(user_id, prob)
|
|
)
|
|
)
|
|
|
|
# Connect to STT server
|
|
try:
|
|
await stt_client.connect()
|
|
self.stt_clients[user_id] = stt_client
|
|
self.active = True
|
|
logger.info(f"✓ STT connected for user {user.name}")
|
|
except Exception as e:
|
|
logger.error(f"Failed to connect STT for user {user.name}: {e}", exc_info=True)
|
|
# Cleanup partial state
|
|
if user_id in self.audio_buffers:
|
|
del self.audio_buffers[user_id]
|
|
if user_id in self.users:
|
|
del self.users[user_id]
|
|
raise
|
|
|
|
async def stop_listening(self, user_id: int):
|
|
"""
|
|
Stop listening to a specific user.
|
|
|
|
Disconnects the STT client and cleans up resources for this user.
|
|
|
|
Args:
|
|
user_id: Discord user ID
|
|
"""
|
|
if user_id not in self.stt_clients:
|
|
logger.warning(f"Not listening to user {user_id}")
|
|
return
|
|
|
|
user = self.users.get(user_id)
|
|
logger.info(f"Stopping listening to user {user.name if user else user_id}")
|
|
|
|
# Disconnect STT client
|
|
stt_client = self.stt_clients[user_id]
|
|
await stt_client.disconnect()
|
|
|
|
# Cleanup
|
|
del self.stt_clients[user_id]
|
|
if user_id in self.audio_buffers:
|
|
del self.audio_buffers[user_id]
|
|
if user_id in self.users:
|
|
del self.users[user_id]
|
|
|
|
# Cancel silence detection task
|
|
if user_id in self.silence_tasks and not self.silence_tasks[user_id].done():
|
|
self.silence_tasks[user_id].cancel()
|
|
del self.silence_tasks[user_id]
|
|
if user_id in self.last_audio_time:
|
|
del self.last_audio_time[user_id]
|
|
|
|
# Clear interruption tracking
|
|
self.interruption_start_time.pop(user_id, None)
|
|
self.interruption_audio_count.pop(user_id, None)
|
|
|
|
# Cleanup opus decoder for this user
|
|
if hasattr(self, '_opus_decoders') and user_id in self._opus_decoders:
|
|
del self._opus_decoders[user_id]
|
|
|
|
# Update active flag
|
|
if not self.stt_clients:
|
|
self.active = False
|
|
|
|
logger.info(f"✓ Stopped listening to user {user.name if user else user_id}")
|
|
|
|
async def stop_all(self):
|
|
"""Stop listening to all users and cleanup all resources."""
|
|
logger.info("Stopping all voice receivers")
|
|
|
|
user_ids = list(self.stt_clients.keys())
|
|
for user_id in user_ids:
|
|
await self.stop_listening(user_id)
|
|
|
|
self.active = False
|
|
logger.info("✓ All voice receivers stopped")
|
|
|
|
async def _send_audio_chunk(self, user_id: int, audio_data: bytes):
|
|
"""
|
|
Send audio chunk to STT client.
|
|
|
|
Buffers audio until we have 512 samples (32ms @ 16kHz) which is what
|
|
Silero VAD expects. Discord sends 320 samples (20ms), so we buffer
|
|
2 chunks and send 640 samples, then the STT server can split it.
|
|
|
|
Args:
|
|
user_id: Discord user ID
|
|
audio_data: PCM audio (int16, 16kHz mono, 320 samples = 640 bytes)
|
|
"""
|
|
stt_client = self.stt_clients.get(user_id)
|
|
if not stt_client or not stt_client.is_connected():
|
|
return
|
|
|
|
try:
|
|
# Get or create buffer for this user
|
|
if user_id not in self.audio_buffers:
|
|
self.audio_buffers[user_id] = deque()
|
|
|
|
buffer = self.audio_buffers[user_id]
|
|
buffer.append(audio_data)
|
|
|
|
# Silero VAD expects 512 samples @ 16kHz (1024 bytes)
|
|
# Discord gives us 320 samples (640 bytes) every 20ms
|
|
# Buffer 2 chunks = 640 samples = 1280 bytes, send as one chunk
|
|
SAMPLES_NEEDED = 512 # What VAD wants
|
|
BYTES_NEEDED = SAMPLES_NEEDED * 2 # int16 = 2 bytes per sample
|
|
|
|
# Check if we have enough buffered audio
|
|
total_bytes = sum(len(chunk) for chunk in buffer)
|
|
|
|
if total_bytes >= BYTES_NEEDED:
|
|
# Concatenate buffered chunks
|
|
combined = b''.join(buffer)
|
|
buffer.clear()
|
|
|
|
# Send in 512-sample (1024-byte) chunks
|
|
for i in range(0, len(combined), BYTES_NEEDED):
|
|
chunk = combined[i:i+BYTES_NEEDED]
|
|
if len(chunk) == BYTES_NEEDED:
|
|
await stt_client.send_audio(chunk)
|
|
else:
|
|
# Put remaining partial chunk back in buffer
|
|
buffer.append(chunk)
|
|
|
|
# Track audio time for silence detection
|
|
import time
|
|
current_time = time.time()
|
|
self.last_audio_time[user_id] = current_time
|
|
|
|
# ===== INTERRUPTION DETECTION =====
|
|
# Check if Miku is speaking and user is interrupting
|
|
# Note: self.voice_manager IS the VoiceSession, not the VoiceManager singleton
|
|
miku_speaking = self.voice_manager.miku_speaking
|
|
logger.debug(f"[INTERRUPTION CHECK] user={user_id}, miku_speaking={miku_speaking}")
|
|
|
|
if miku_speaking:
|
|
# Track interruption
|
|
if user_id not in self.interruption_start_time:
|
|
# First chunk during Miku's speech
|
|
self.interruption_start_time[user_id] = current_time
|
|
self.interruption_audio_count[user_id] = 1
|
|
else:
|
|
# Increment chunk count
|
|
self.interruption_audio_count[user_id] += 1
|
|
|
|
# Calculate interruption duration
|
|
interruption_duration = current_time - self.interruption_start_time[user_id]
|
|
chunk_count = self.interruption_audio_count[user_id]
|
|
|
|
# Check if interruption threshold is met
|
|
if (interruption_duration >= self.interruption_threshold_time and
|
|
chunk_count >= self.interruption_threshold_chunks):
|
|
|
|
# Trigger interruption!
|
|
logger.info(f"🛑 User {user_id} interrupted Miku (duration={interruption_duration:.2f}s, chunks={chunk_count})")
|
|
logger.info(f" → Stopping Miku's TTS and LLM, will process user's speech when finished")
|
|
|
|
# Reset interruption tracking
|
|
self.interruption_start_time.pop(user_id, None)
|
|
self.interruption_audio_count.pop(user_id, None)
|
|
|
|
# Call interruption handler (this sets miku_speaking=False)
|
|
asyncio.create_task(
|
|
self.voice_manager.on_user_interruption(user_id)
|
|
)
|
|
else:
|
|
# Miku not speaking, clear interruption tracking
|
|
self.interruption_start_time.pop(user_id, None)
|
|
self.interruption_audio_count.pop(user_id, None)
|
|
|
|
# Cancel existing silence task if any
|
|
if user_id in self.silence_tasks and not self.silence_tasks[user_id].done():
|
|
self.silence_tasks[user_id].cancel()
|
|
|
|
# Start new silence detection task
|
|
self.silence_tasks[user_id] = asyncio.create_task(
|
|
self._detect_silence(user_id)
|
|
)
|
|
|
|
except Exception as e:
|
|
logger.error(f"Failed to send audio chunk for user {user_id}: {e}")
|
|
|
|
async def _detect_silence(self, user_id: int):
|
|
"""
|
|
Wait for silence timeout and send 'final' command to STT.
|
|
|
|
This is called after each audio chunk. If no more audio arrives within
|
|
the silence_timeout period, we send the 'final' command to get the
|
|
complete transcription.
|
|
|
|
Args:
|
|
user_id: Discord user ID
|
|
"""
|
|
try:
|
|
# Wait for silence timeout
|
|
await asyncio.sleep(self.silence_timeout)
|
|
|
|
# Check if we still have an active STT client
|
|
stt_client = self.stt_clients.get(user_id)
|
|
if not stt_client or not stt_client.is_connected():
|
|
return
|
|
|
|
# Send final command to get complete transcription
|
|
logger.debug(f"Silence detected for user {user_id}, requesting final transcript")
|
|
await stt_client.send_final()
|
|
|
|
except asyncio.CancelledError:
|
|
# Task was cancelled because new audio arrived
|
|
pass
|
|
except Exception as e:
|
|
logger.error(f"Error in silence detection for user {user_id}: {e}")
|
|
|
|
async def _on_vad_event(self, user_id: int, event: dict):
|
|
"""
|
|
Handle VAD event from STT.
|
|
|
|
Args:
|
|
user_id: Discord user ID
|
|
event: VAD event dictionary with 'event' and 'probability' keys
|
|
"""
|
|
user = self.users.get(user_id)
|
|
event_type = event.get('event', 'unknown')
|
|
probability = event.get('probability', 0.0)
|
|
|
|
logger.debug(f"VAD [{user.name if user else user_id}]: {event_type} (prob={probability:.3f})")
|
|
|
|
# Notify voice manager - pass the full event dict
|
|
if hasattr(self.voice_manager, 'on_user_vad_event'):
|
|
await self.voice_manager.on_user_vad_event(user_id, event)
|
|
|
|
async def _on_partial_transcript(self, user_id: int, text: str):
|
|
"""
|
|
Handle partial transcript from STT.
|
|
|
|
Args:
|
|
user_id: Discord user ID
|
|
text: Partial transcript text
|
|
"""
|
|
user = self.users.get(user_id)
|
|
logger.info(f"[VOICE_RECEIVER] Partial [{user.name if user else user_id}]: {text}")
|
|
print(f"[DEBUG] PARTIAL TRANSCRIPT RECEIVED: {text}") # Extra debug
|
|
|
|
# Notify voice manager
|
|
if hasattr(self.voice_manager, 'on_partial_transcript'):
|
|
await self.voice_manager.on_partial_transcript(user_id, text)
|
|
|
|
async def _on_final_transcript(self, user_id: int, text: str, user: discord.User):
|
|
"""
|
|
Handle final transcript from STT.
|
|
|
|
This triggers the LLM response generation.
|
|
|
|
Args:
|
|
user_id: Discord user ID
|
|
text: Final transcript text
|
|
user: Discord user object
|
|
"""
|
|
logger.info(f"[VOICE_RECEIVER] Final [{user.name if user else user_id}]: {text}")
|
|
print(f"[DEBUG] FINAL TRANSCRIPT RECEIVED: {text}") # Extra debug
|
|
|
|
# Notify voice manager - THIS TRIGGERS LLM RESPONSE
|
|
if hasattr(self.voice_manager, 'on_final_transcript'):
|
|
await self.voice_manager.on_final_transcript(user_id, text)
|
|
|
|
async def _on_interruption(self, user_id: int, probability: float):
|
|
"""
|
|
Handle interruption detection from STT.
|
|
|
|
This cancels Miku's current speech if user interrupts.
|
|
|
|
Args:
|
|
user_id: Discord user ID
|
|
probability: Interruption confidence probability
|
|
"""
|
|
user = self.users.get(user_id)
|
|
logger.info(f"Interruption from [{user.name if user else user_id}] (prob={probability:.3f})")
|
|
|
|
# Notify voice manager - THIS CANCELS MIKU'S SPEECH
|
|
if hasattr(self.voice_manager, 'on_user_interruption'):
|
|
await self.voice_manager.on_user_interruption(user_id, probability)
|
|
|
|
def get_listening_users(self) -> list:
|
|
"""
|
|
Get list of users currently being listened to.
|
|
|
|
Returns:
|
|
List of dicts with user_id, username, and connection status
|
|
"""
|
|
return [
|
|
{
|
|
'user_id': user_id,
|
|
'username': user.name if user else 'Unknown',
|
|
'connected': client.is_connected()
|
|
}
|
|
for user_id, (user, client) in
|
|
[(uid, (self.users.get(uid), self.stt_clients.get(uid)))
|
|
for uid in self.stt_clients.keys()]
|
|
]
|
|
|
|
@voice_recv.AudioSink.listener()
|
|
def on_voice_member_speaking_start(self, member: discord.Member):
|
|
"""
|
|
Called when a member starts speaking (green circle appears).
|
|
|
|
This is a virtual event from discord-ext-voice-recv based on packet activity.
|
|
"""
|
|
if member.id in self.stt_clients:
|
|
logger.debug(f"🎤 {member.name} started speaking")
|
|
|
|
@voice_recv.AudioSink.listener()
|
|
def on_voice_member_speaking_stop(self, member: discord.Member):
|
|
"""
|
|
Called when a member stops speaking (green circle disappears).
|
|
|
|
This is a virtual event from discord-ext-voice-recv based on packet activity.
|
|
"""
|
|
if member.id in self.stt_clients:
|
|
logger.debug(f"🔇 {member.name} stopped speaking")
|