feature/network_audio (#6)

- make the device work standalone with webui
- add support for aes67
- may more things

Co-authored-by: pstruebi <struebin.patrick.com>
Reviewed-on: https://gitea.pstruebi.xyz/auracaster/bumble-auracast/pulls/6

src/auracast/utils/webrtc_audio_input.py

@@ -0,0 +1,42 @@
+import asyncio
+import numpy as np
+import logging
+
+class WebRTCAudioInput:
+    """
+    Buffer PCM samples from WebRTC and provide an async generator interface for chunked frames.
+    """
+    def __init__(self):
+        self.buffer = np.array([], dtype=np.int16)
+        self.lock = asyncio.Lock()
+        self.data_available = asyncio.Event()
+        self.closed = False
+
+    async def frames(self, frame_size: int):
+        """
+        Async generator yielding exactly frame_size samples as numpy arrays.
+        """
+        while not self.closed:
+            async with self.lock:
+                if len(self.buffer) >= frame_size:
+                    chunk = self.buffer[:frame_size]
+                    self.buffer = self.buffer[frame_size:]
+                    logging.debug(f"WebRTCAudioInput: Yielding {frame_size} samples, buffer now has {len(self.buffer)} samples remaining.")
+                    yield chunk
+                else:
+                    self.data_available.clear()
+            await self.data_available.wait()
+
+    async def put_samples(self, samples: np.ndarray):
+        """
+        Add new PCM samples (1D np.int16 array, mono) to the buffer.
+        """
+        async with self.lock:
+            self.buffer = np.concatenate([self.buffer, samples])
+            logging.debug(f"WebRTCAudioInput: Added {len(samples)} samples, buffer now has {len(self.buffer)} samples.")
+            self.data_available.set()
+
+    async def close(self):
+        """Mark the input closed so frames() stops yielding."""
+        self.closed = True
+        self.data_available.set()