fix: 改用soundfile保存音频，解决torchaudio格式问题

requirements.txt

@@ -4,4 +4,5 @@ python-multipart==0.0.9
 torch==2.2.0
 torchaudio==2.2.0
 transformers==4.38.0
-ChatTTS==0.1.1
+ChatTTS
+soundfile==0.12.1

server.py

@@ -124,11 +124,15 @@ def save_audio(audio_tensor: torch.Tensor, filename: str) -> str:
     filepath = os.path.join(AUDIO_DIR, filename)
     
     # 确保 tensor 正确形状
-    if audio_tensor.dim() == 1:
-        audio_tensor = audio_tensor.unsqueeze(0)
+    if audio_tensor.dim() == 2:
+        audio_tensor = audio_tensor.squeeze(0)
     
-    # 保存为 WAV
-    torchaudio.save(filepath, audio_tensor, SAMPLE_RATE, format="wav")
+    # 转换为 numpy
+    audio_np = audio_tensor.cpu().numpy() if audio_tensor.is_cuda else audio_tensor.numpy()
+    
+    # 使用 soundfile 保存
+    import soundfile as sf
+    sf.write(filepath, audio_np, SAMPLE_RATE)
     
     return filepath