634 lines
23 KiB
Python
634 lines
23 KiB
Python
#!/usr/bin/env python3
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"""
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WAV file client for testing duplex voice conversation.
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This client reads audio from a WAV file, sends it to the server,
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and saves a stereo WAV file with the input audio on the left channel
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and the AI's voice response on the right channel.
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Usage:
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python examples/wav_client.py --input input.wav --output response.wav
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python examples/wav_client.py --input input.wav --output response.wav --url ws://localhost:8000/ws
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python examples/wav_client.py --input input.wav --output response.wav --wait-time 10
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python wav_client.py --input ../data/audio_examples/two_utterances.wav -o response.wav
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Requirements:
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pip install soundfile websockets numpy
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"""
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import argparse
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import asyncio
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import json
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import sys
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import time
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import wave
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from pathlib import Path
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from urllib.parse import parse_qsl, urlencode, urlsplit, urlunsplit
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try:
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import numpy as np
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except ImportError:
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print("Please install numpy: pip install numpy")
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sys.exit(1)
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try:
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import soundfile as sf
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except ImportError:
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print("Please install soundfile: pip install soundfile")
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sys.exit(1)
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try:
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import websockets
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except ImportError:
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print("Please install websockets: pip install websockets")
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sys.exit(1)
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class WavFileClient:
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"""
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WAV file client for voice conversation testing.
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Features:
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- Read audio from WAV file
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- Send audio to WebSocket server
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- Receive and save stereo conversation audio
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- Event logging
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"""
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def __init__(
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self,
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url: str,
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input_file: str,
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output_file: str,
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assistant_id: str = "default",
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channel: str = "wav_client",
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sample_rate: int = 16000,
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chunk_duration_ms: int = 20,
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wait_time: float = 15.0,
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verbose: bool = False,
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track_debug: bool = False,
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tail_silence_ms: int = 800,
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):
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"""
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Initialize WAV file client.
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Args:
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url: WebSocket server URL
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input_file: Input WAV file path
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output_file: Output WAV file path
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sample_rate: Audio sample rate (Hz)
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chunk_duration_ms: Audio chunk duration (ms) for sending
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wait_time: Time to wait for response after sending (seconds)
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verbose: Enable verbose output
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"""
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self.url = url
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self.input_file = Path(input_file)
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self.output_file = Path(output_file)
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self.assistant_id = assistant_id
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self.channel = channel
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self.sample_rate = sample_rate
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self.chunk_duration_ms = chunk_duration_ms
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self.chunk_samples = int(sample_rate * chunk_duration_ms / 1000)
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self.wait_time = wait_time
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self.verbose = verbose
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self.track_debug = track_debug
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self.tail_silence_ms = max(0, int(tail_silence_ms))
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self.frame_bytes = 640 # 16k mono pcm_s16le, 20ms
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# WebSocket connection
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self.ws = None
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self.running = False
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# Audio buffers
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self.input_audio = np.array([], dtype=np.int16)
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self.received_audio = bytearray()
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self.output_segments: list[dict[str, object]] = []
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self.current_output_segment: bytearray | None = None
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# Statistics
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self.bytes_sent = 0
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self.bytes_received = 0
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# TTFB tracking (per response)
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self.send_start_time = None
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self.response_start_time = None # set on each output.audio.start
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self.waiting_for_first_audio = False
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self.ttfb_ms = None # last TTFB for summary
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self.ttfb_list = [] # TTFB for each response
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# State tracking
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self.track_started = False
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self.track_ended = False
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self.send_completed = False
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self.session_ready = False
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# Events log
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self.events_log = []
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def log_event(self, direction: str, message: str) -> None:
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"""Log an event with timestamp."""
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timestamp = time.time()
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self.events_log.append(
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{
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"timestamp": timestamp,
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"direction": direction,
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"message": message,
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}
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)
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try:
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print(f"{direction} {message}")
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except UnicodeEncodeError:
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safe_message = message.encode("ascii", errors="replace").decode("ascii")
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print(f"{direction} {safe_message}")
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@staticmethod
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def _event_ids_suffix(event: dict) -> str:
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data = event.get("data") if isinstance(event.get("data"), dict) else {}
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keys = ("turn_id", "utterance_id", "response_id", "tool_call_id", "tts_id")
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parts = []
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for key in keys:
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value = data.get(key, event.get(key))
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if value:
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parts.append(f"{key}={value}")
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return f" [{' '.join(parts)}]" if parts else ""
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def _session_url(self) -> str:
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parts = urlsplit(self.url)
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query = dict(parse_qsl(parts.query, keep_blank_values=True))
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query["assistant_id"] = self.assistant_id
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return urlunsplit((parts.scheme, parts.netloc, parts.path, urlencode(query), parts.fragment))
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def _current_timeline_sample(self) -> int:
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"""Return current sample position relative to input send start."""
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if self.send_start_time is None:
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return 0
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elapsed_seconds = max(0.0, time.time() - self.send_start_time)
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return int(round(elapsed_seconds * self.sample_rate))
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def _start_output_segment(self) -> None:
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"""Create a new assistant-audio segment if one is not active."""
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if self.current_output_segment is not None:
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return
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self.current_output_segment = bytearray()
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self.output_segments.append(
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{
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"start_sample": self._current_timeline_sample(),
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"audio": self.current_output_segment,
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}
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)
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def _close_output_segment(self) -> None:
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"""Close the active assistant-audio segment, if any."""
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self.current_output_segment = None
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def _build_input_track(self) -> np.ndarray:
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"""Build the saved left channel using the streamed input audio."""
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input_track = self.input_audio.astype(np.int16, copy=True)
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tail_samples = int(round(self.sample_rate * self.tail_silence_ms / 1000.0))
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if tail_samples <= 0:
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return input_track
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if input_track.size == 0:
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return np.zeros(tail_samples, dtype=np.int16)
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return np.concatenate((input_track, np.zeros(tail_samples, dtype=np.int16)))
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def _build_output_track(self) -> np.ndarray:
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"""Build the saved right channel using received assistant audio."""
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if not self.output_segments:
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return np.zeros(0, dtype=np.int16)
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total_samples = max(
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int(segment["start_sample"]) + (len(segment["audio"]) // 2)
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for segment in self.output_segments
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)
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mixed_track = np.zeros(total_samples, dtype=np.int32)
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for segment in self.output_segments:
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start_sample = int(segment["start_sample"])
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segment_audio = np.frombuffer(bytes(segment["audio"]), dtype=np.int16).astype(np.int32)
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if segment_audio.size == 0:
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continue
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end_sample = start_sample + segment_audio.size
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mixed_track[start_sample:end_sample] += segment_audio
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np.clip(mixed_track, -32768, 32767, out=mixed_track)
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return mixed_track.astype(np.int16)
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async def connect(self) -> None:
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"""Connect to WebSocket server."""
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session_url = self._session_url()
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self.log_event("->", f"Connecting to {session_url}...")
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self.ws = await websockets.connect(session_url)
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self.running = True
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self.log_event("->", "Connected!")
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await self.send_command(
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{
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"type": "session.start",
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"audio": {
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"encoding": "pcm_s16le",
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"sample_rate_hz": self.sample_rate,
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"channels": 1,
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},
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"metadata": {
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"channel": self.channel,
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"source": "wav_client",
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},
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}
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)
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async def send_command(self, cmd: dict) -> None:
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"""Send JSON command to server."""
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if self.ws:
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await self.ws.send(json.dumps(cmd))
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self.log_event("->", f"Command: {cmd.get('type', 'unknown')}")
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async def send_hangup(self, reason: str = "Session complete") -> None:
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"""Send hangup command."""
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await self.send_command({"type": "session.stop", "reason": reason})
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def load_wav_file(self) -> tuple[np.ndarray, int]:
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"""
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Load and prepare WAV file for sending.
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Returns:
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Tuple of (audio_data as int16 numpy array, original sample rate)
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"""
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if not self.input_file.exists():
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raise FileNotFoundError(f"Input file not found: {self.input_file}")
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audio_data, file_sample_rate = sf.read(self.input_file)
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self.log_event("->", f"Loaded: {self.input_file}")
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self.log_event("->", f" Original sample rate: {file_sample_rate} Hz")
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self.log_event("->", f" Duration: {len(audio_data) / file_sample_rate:.2f}s")
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if len(audio_data.shape) > 1:
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audio_data = audio_data.mean(axis=1)
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self.log_event("->", " Converted stereo to mono")
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if file_sample_rate != self.sample_rate:
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duration = len(audio_data) / file_sample_rate
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num_samples = int(duration * self.sample_rate)
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indices = np.linspace(0, len(audio_data) - 1, num_samples)
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audio_data = np.interp(indices, np.arange(len(audio_data)), audio_data)
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self.log_event("->", f" Resampled to {self.sample_rate} Hz")
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if audio_data.dtype != np.int16:
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max_val = np.max(np.abs(audio_data))
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if max_val > 1.0:
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audio_data = audio_data / max_val
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audio_data = (audio_data * 32767).astype(np.int16)
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self.log_event("->", f" Prepared: {len(audio_data)} samples ({len(audio_data) / self.sample_rate:.2f}s)")
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self.input_audio = audio_data.copy()
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return audio_data, file_sample_rate
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async def audio_sender(self, audio_data: np.ndarray) -> None:
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"""Send audio data to server in chunks."""
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total_samples = len(audio_data)
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chunk_size = self.chunk_samples
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sent_samples = 0
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self.send_start_time = time.time()
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self.log_event("->", f"Starting audio transmission ({total_samples} samples)...")
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while sent_samples < total_samples and self.running:
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end_sample = min(sent_samples + chunk_size, total_samples)
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chunk = audio_data[sent_samples:end_sample]
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chunk_bytes = chunk.tobytes()
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if len(chunk_bytes) % self.frame_bytes != 0:
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pad = self.frame_bytes - (len(chunk_bytes) % self.frame_bytes)
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chunk_bytes += b"\x00" * pad
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if self.ws:
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await self.ws.send(chunk_bytes)
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self.bytes_sent += len(chunk_bytes)
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sent_samples = end_sample
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if self.verbose and sent_samples % (self.sample_rate // 2) == 0:
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progress = (sent_samples / total_samples) * 100
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print(f" Sending: {progress:.0f}%", end="\r")
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await asyncio.sleep(self.chunk_duration_ms / 1000)
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if self.tail_silence_ms > 0 and self.ws:
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tail_frames = max(1, self.tail_silence_ms // 20)
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silence = b"\x00" * self.frame_bytes
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for _ in range(tail_frames):
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await self.ws.send(silence)
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self.bytes_sent += len(silence)
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await asyncio.sleep(0.02)
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self.log_event("->", f"Sent trailing silence: {self.tail_silence_ms}ms")
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self.send_completed = True
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elapsed = time.time() - self.send_start_time
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self.log_event("->", f"Audio transmission complete ({elapsed:.2f}s, {self.bytes_sent / 1024:.1f} KB)")
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async def receiver(self) -> None:
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"""Receive messages from server."""
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try:
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while self.running:
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try:
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message = await asyncio.wait_for(self.ws.recv(), timeout=0.1)
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if isinstance(message, bytes):
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self.bytes_received += len(message)
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self.received_audio.extend(message)
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self._start_output_segment()
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self.current_output_segment.extend(message)
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if self.waiting_for_first_audio and self.response_start_time is not None:
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ttfb_ms = (time.time() - self.response_start_time) * 1000
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self.ttfb_ms = ttfb_ms
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self.ttfb_list.append(ttfb_ms)
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self.waiting_for_first_audio = False
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self.log_event("<-", f"[TTFB] First audio latency: {ttfb_ms:.0f}ms")
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duration_ms = len(message) / (self.sample_rate * 2) * 1000
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total_ms = len(self.received_audio) / (self.sample_rate * 2) * 1000
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if self.verbose:
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print(f"<- Audio: +{duration_ms:.0f}ms (total: {total_ms:.0f}ms)", end="\r")
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else:
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event = json.loads(message)
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await self._handle_event(event)
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except asyncio.TimeoutError:
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continue
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except websockets.ConnectionClosed:
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self.log_event("<-", "Connection closed")
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self.running = False
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break
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except asyncio.CancelledError:
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pass
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except Exception as exc:
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self.log_event("!", f"Receiver error: {exc}")
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self.running = False
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async def _handle_event(self, event: dict) -> None:
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"""Handle incoming event."""
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event_type = event.get("type", "unknown")
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ids = self._event_ids_suffix(event)
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if self.track_debug:
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print(f"[track-debug] event={event_type} trackId={event.get('trackId')}{ids}")
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if event_type == "session.started":
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self.session_ready = True
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self.log_event("<-", f"Session ready!{ids}")
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elif event_type == "config.resolved":
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config = event.get("config", {})
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self.log_event("<-", f"Config resolved (output={config.get('output', {})}){ids}")
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elif event_type == "input.speech_started":
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self.log_event("<-", f"Speech detected{ids}")
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elif event_type == "input.speech_stopped":
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self.log_event("<-", f"Silence detected{ids}")
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elif event_type == "transcript.delta":
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text = event.get("text", "")
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display_text = text[:60] + "..." if len(text) > 60 else text
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print(f" [listening] {display_text}".ljust(80), end="\r")
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elif event_type == "transcript.final":
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text = event.get("text", "")
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print(" " * 80, end="\r")
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self.log_event("<-", f"You: {text}{ids}")
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elif event_type == "metrics.ttfb":
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latency_ms = event.get("latencyMs", 0)
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self.log_event("<-", f"[TTFB] Server latency: {latency_ms}ms")
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elif event_type == "assistant.response.delta":
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text = event.get("text", "")
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if self.verbose and text:
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self.log_event("<-", f"LLM: {text}{ids}")
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elif event_type == "assistant.response.final":
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text = event.get("text", "")
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if text:
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summary = text[:100] + ("..." if len(text) > 100 else "")
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self.log_event("<-", f"LLM Response (final): {summary}{ids}")
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elif event_type == "output.audio.start":
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self.track_started = True
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self.response_start_time = time.time()
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self.waiting_for_first_audio = True
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self._close_output_segment()
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self.log_event("<-", f"Bot started speaking{ids}")
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elif event_type == "output.audio.end":
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self.track_ended = True
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self._close_output_segment()
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self.log_event("<-", f"Bot finished speaking{ids}")
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elif event_type == "response.interrupted":
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self._close_output_segment()
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self.log_event("<-", f"Bot interrupted!{ids}")
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elif event_type == "error":
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self.log_event("!", f"Error: {event.get('message')}{ids}")
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elif event_type == "session.stopped":
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self.log_event("<-", f"Session stopped: {event.get('reason')}{ids}")
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self.running = False
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else:
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self.log_event("<-", f"Event: {event_type}{ids}")
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def save_output_wav(self) -> None:
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"""Save the conversation to a stereo WAV file."""
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input_track = self._build_input_track()
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output_track = self._build_output_track()
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if input_track.size == 0 and output_track.size == 0:
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self.log_event("!", "No audio available to save")
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return
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if not self.received_audio:
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self.log_event("!", "No assistant audio received; saving silent right channel")
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total_samples = max(input_track.size, output_track.size)
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if input_track.size < total_samples:
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input_track = np.pad(input_track, (0, total_samples - input_track.size))
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if output_track.size < total_samples:
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output_track = np.pad(output_track, (0, total_samples - output_track.size))
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stereo_audio = np.column_stack((input_track, output_track)).astype(np.int16, copy=False)
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self.output_file.parent.mkdir(parents=True, exist_ok=True)
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with wave.open(str(self.output_file), "wb") as wav_file:
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wav_file.setnchannels(2)
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wav_file.setsampwidth(2) # 16-bit
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wav_file.setframerate(self.sample_rate)
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wav_file.writeframes(stereo_audio.tobytes())
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duration = total_samples / self.sample_rate
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self.log_event("->", f"Saved stereo output: {self.output_file}")
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self.log_event("->", f" Duration: {duration:.2f}s ({total_samples} samples/channel)")
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self.log_event("->", " Channels: left=input, right=assistant")
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self.log_event("->", f" Size: {stereo_audio.nbytes / 1024:.1f} KB")
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async def run(self) -> None:
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"""Run the WAV file test."""
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try:
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audio_data, _ = self.load_wav_file()
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await self.connect()
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receiver_task = asyncio.create_task(self.receiver())
|
|
|
|
ready_start = time.time()
|
|
while self.running and not self.session_ready:
|
|
if time.time() - ready_start > 8.0:
|
|
raise TimeoutError("Timeout waiting for session.started")
|
|
await asyncio.sleep(0.05)
|
|
|
|
await self.audio_sender(audio_data)
|
|
|
|
self.log_event("->", f"Waiting {self.wait_time}s for response...")
|
|
|
|
wait_start = time.time()
|
|
while self.running and (time.time() - wait_start) < self.wait_time:
|
|
if self.track_ended and self.send_completed:
|
|
await asyncio.sleep(1.0)
|
|
break
|
|
await asyncio.sleep(0.1)
|
|
|
|
self.running = False
|
|
receiver_task.cancel()
|
|
|
|
try:
|
|
await receiver_task
|
|
except asyncio.CancelledError:
|
|
pass
|
|
|
|
self.save_output_wav()
|
|
self._print_summary()
|
|
|
|
except FileNotFoundError as exc:
|
|
print(f"Error: {exc}")
|
|
sys.exit(1)
|
|
except ConnectionRefusedError:
|
|
print(f"Error: Could not connect to {self.url}")
|
|
print("Make sure the server is running.")
|
|
sys.exit(1)
|
|
except Exception as exc:
|
|
print(f"Error: {exc}")
|
|
import traceback
|
|
|
|
traceback.print_exc()
|
|
sys.exit(1)
|
|
finally:
|
|
await self.close()
|
|
|
|
def _print_summary(self) -> None:
|
|
"""Print session summary."""
|
|
print("\n" + "=" * 50)
|
|
print("Session Summary")
|
|
print("=" * 50)
|
|
print(f" Input file: {self.input_file}")
|
|
print(f" Output file: {self.output_file}")
|
|
print(f" Bytes sent: {self.bytes_sent / 1024:.1f} KB")
|
|
print(f" Bytes received: {self.bytes_received / 1024:.1f} KB")
|
|
if self.ttfb_list:
|
|
if len(self.ttfb_list) == 1:
|
|
print(f" TTFB: {self.ttfb_list[0]:.0f} ms")
|
|
else:
|
|
values = ", ".join(f"{ttfb:.0f}ms" for ttfb in self.ttfb_list)
|
|
print(f" TTFB (per response): {values}")
|
|
if self.received_audio:
|
|
duration = len(self.received_audio) / (self.sample_rate * 2)
|
|
print(f" Response duration: {duration:.2f}s")
|
|
print("=" * 50)
|
|
|
|
async def close(self) -> None:
|
|
"""Close the connection."""
|
|
self.running = False
|
|
if self.ws:
|
|
try:
|
|
await self.ws.close()
|
|
except Exception:
|
|
pass
|
|
|
|
|
|
async def main():
|
|
parser = argparse.ArgumentParser(
|
|
description="WAV file client for testing duplex voice conversation"
|
|
)
|
|
parser.add_argument(
|
|
"--input",
|
|
"-i",
|
|
required=True,
|
|
help="Input WAV file path",
|
|
)
|
|
parser.add_argument(
|
|
"--output",
|
|
"-o",
|
|
required=True,
|
|
help="Output WAV file path for stereo conversation audio",
|
|
)
|
|
parser.add_argument(
|
|
"--url",
|
|
default="ws://localhost:8000/ws",
|
|
help="WebSocket server URL (default: ws://localhost:8000/ws)",
|
|
)
|
|
parser.add_argument(
|
|
"--sample-rate",
|
|
type=int,
|
|
default=16000,
|
|
help="Target sample rate for audio (default: 16000)",
|
|
)
|
|
parser.add_argument(
|
|
"--assistant-id",
|
|
default="default",
|
|
help="Assistant identifier used in websocket query parameter",
|
|
)
|
|
parser.add_argument(
|
|
"--channel",
|
|
default="wav_client",
|
|
help="Client channel name",
|
|
)
|
|
parser.add_argument(
|
|
"--chunk-duration",
|
|
type=int,
|
|
default=20,
|
|
help="Chunk duration in ms for sending (default: 20)",
|
|
)
|
|
parser.add_argument(
|
|
"--wait-time",
|
|
"-w",
|
|
type=float,
|
|
default=15.0,
|
|
help="Time to wait for response after sending (default: 15.0)",
|
|
)
|
|
parser.add_argument(
|
|
"--verbose",
|
|
"-v",
|
|
action="store_true",
|
|
help="Enable verbose output",
|
|
)
|
|
parser.add_argument(
|
|
"--track-debug",
|
|
action="store_true",
|
|
help="Print event trackId for protocol debugging",
|
|
)
|
|
parser.add_argument(
|
|
"--tail-silence-ms",
|
|
type=int,
|
|
default=800,
|
|
help="Trailing silence to send after WAV playback for EOU detection (default: 800)",
|
|
)
|
|
|
|
args = parser.parse_args()
|
|
|
|
client = WavFileClient(
|
|
url=args.url,
|
|
input_file=args.input,
|
|
output_file=args.output,
|
|
assistant_id=args.assistant_id,
|
|
channel=args.channel,
|
|
sample_rate=args.sample_rate,
|
|
chunk_duration_ms=args.chunk_duration,
|
|
wait_time=args.wait_time,
|
|
verbose=args.verbose,
|
|
track_debug=args.track_debug,
|
|
tail_silence_ms=args.tail_silence_ms,
|
|
)
|
|
|
|
await client.run()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
try:
|
|
asyncio.run(main())
|
|
except KeyboardInterrupt:
|
|
print("\nInterrupted by user") |