Fix audio type conversion (#259)

* Fix conversion between audio dtypes

* Run Pytest in CI

* Add pytest tests path in pyproject.toml

* Fix usages

* Use other PR's test format (more or less)

* Support legacy arguments

* Fix pyproject.toml and test location

* Omit `test` arg in CI, given by pyproject.toml

---------

Co-authored-by: Freddy Boulton <alfonsoboulton@gmail.com>

demo/nextjs_voice_chat/backend/server.py

@@ -1,6 +1,6 @@
 import fastapi
 from fastrtc import ReplyOnPause, Stream, AlgoOptions, SileroVadOptions
-from fastrtc.utils import audio_to_bytes
+from fastrtc.utils import audio_to_bytes, audio_to_float32
 from openai import OpenAI
 import logging
 import time
@@ -78,8 +78,8 @@ def echo(audio):
     )
 
     for audio_chunk in audio_stream:
-        audio_array = (
-            np.frombuffer(audio_chunk, dtype=np.int16).astype(np.float32) / 32768.0
+        audio_array = audio_to_float32(
+            np.frombuffer(audio_chunk, dtype=np.int16)
         )
         yield (24000, audio_array)