Fix TTS error by updating save_pcm_to_wav to handle 16-bit audio samples correctly using NumPy tobytes()

app.py

@@ -69,13 +69,16 @@ NLLB_LANGUAGE_CODES = {
 
 # Function to save PCM data as a WAV file
 def save_pcm_to_wav(pcm_data: list, sample_rate: int, output_path: str):
+    # Convert pcm_data to a NumPy array of 16-bit integers
+    pcm_array = np.array(pcm_data, dtype=np.int16)
+    
     with wave.open(output_path, 'wb') as wav_file:
         # Set WAV parameters: 1 channel (mono), 2 bytes per sample (16-bit), sample rate
         wav_file.setnchannels(1)
         wav_file.setsampwidth(2)  # 16-bit audio
         wav_file.setframerate(sample_rate)
-        # Convert PCM data (list of integers) to bytes
-        wav_file.writeframes(bytes(pcm_data))
+        # Write the 16-bit PCM data as bytes (little-endian)
+        wav_file.writeframes(pcm_array.tobytes())
 
 # Function to clean up old audio files
 def cleanup_old_audio_files():