Create realtime_transcriber.py

realtime_transcriber.py

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+import asyncio
+from websockets import connect, Data, ClientConnection
+import json
+import numpy as np
+import base64
+import soundfile as sf
+import io
+from pydub import AudioSegment
+
+# Load OpenAI API key from environment (dotenv is optional)
+import os
+from dotenv import load_dotenv
+load_dotenv()
+
+OPENAI_API_KEY = os.environ.get("OPENAI_API_KEY")
+if not OPENAI_API_KEY:
+    raise ValueError("OPENAI_API_KEY environment variable must be set")
+
+WEBSOCKET_URI = "wss://api.openai.com/v1/realtime?intent=transcription"
+WEBSOCKET_HEADERS = {
+    "Authorization": "Bearer " + OPENAI_API_KEY,
+    "OpenAI-Beta": "realtime=v1"
+}
+
+connections = {}
+
+class WebSocketClient:
+    def __init__(self, uri: str, headers: dict, client_id: str):
+        self.uri = uri
+        self.headers = headers
+        self.websocket: ClientConnection = None
+        self.queue = asyncio.Queue(maxsize=10)
+        self.loop = None
+        self.client_id = client_id
+        self.transcript = ""
+
+    async def connect(self):
+        try:
+            self.websocket = await connect(self.uri, additional_headers=self.headers)
+            print("✅ Connected to OpenAI WebSocket")
+
+            with open("openai_transcription_settings.json", "r") as f:
+                settings = f.read()
+                await self.websocket.send(settings)
+
+            await asyncio.gather(self.receive_messages(), self.send_audio_chunks())
+        except Exception as e:
+            print(f"❌ WebSocket error: {e}")
+
+    def run(self):
+        self.loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(self.loop)
+        self.loop.run_until_complete(self.connect())
+
+    def process_websocket_message(self, message: Data):
+        message_object = json.loads(message)
+        if message_object["type"] != "error":
+            if message_object["type"] == "conversation.item.input_audio_transcription.delta":
+                delta = message_object["delta"]
+                self.transcript += delta
+            elif message_object["type"] == "conversation.item.input_audio_transcription.completed":
+                self.transcript += ' ' if len(self.transcript) and self.transcript[-1] != ' ' else ''
+        else:
+            print(f"⚠️ Error received: {message}")
+
+    async def send_audio_chunks(self):
+        while True:
+            sample_rate, audio_array = await self.queue.get()
+            if self.websocket:
+                if audio_array.ndim > 1:
+                    audio_array = audio_array.mean(axis=1)
+                audio_array = audio_array.astype(np.float32)
+                audio_array /= np.max(np.abs(audio_array)) if np.max(np.abs(audio_array)) > 0 else 1.0
+                audio_array_int16 = (audio_array * 32767).astype(np.int16)
+
+                buffer = io.BytesIO()
+                sf.write(buffer, audio_array_int16, sample_rate, format='WAV', subtype='PCM_16')
+                buffer.seek(0)
+                segment = AudioSegment.from_file(buffer, format="wav")
+                resampled = segment.set_frame_rate(24000)
+
+                out_buf = io.BytesIO()
+                resampled.export(out_buf, format="wav")
+                out_buf.seek(0)
+
+                b64_audio = base64.b64encode(out_buf.read()).decode("utf-8")
+                await self.websocket.send(json.dumps({
+                    "type": "input_audio_buffer.append",
+                    "audio": b64_audio
+                }))
+
+    async def receive_messages(self):
+        async for message in self.websocket:
+            self.process_websocket_message(message)
+
+    def enqueue_audio_chunk(self, sample_rate: int, chunk_array: np.ndarray):
+        if not self.queue.full():
+            asyncio.run_coroutine_threadsafe(self.queue.put((sample_rate, chunk_array)), self.loop)
+
+    async def close(self):
+        if self.websocket:
+            await self.websocket.close()
+            connections.pop(self.client_id)