refactor(engine): 修改虚拟环境设置，修改音频工具函数

- 更新虚拟环境目录名为 .venv
- 调整音频块采集速率默认值为 10
- 为 AudioStream 类添加重设音频块大小的方法
- 更新依赖文件 requirements.txt

engine/utils/__init__.py

@@ -1,4 +1,9 @@
-from .audioprcs import merge_chunk_channels, resample_chunk_mono, resample_mono_chunk
+from .audioprcs import (
+    merge_chunk_channels,
+    resample_chunk_mono,
+    resample_chunk_mono_np,
+    resample_mono_chunk
+)
 from .sysout import stdout, stdout_cmd, stdout_obj, stderr
 from .thdata import thread_data
 from .server import start_server

engine/utils/audioprcs.py

@@ -55,6 +55,37 @@ def resample_chunk_mono(chunk: bytes, channels: int, orig_sr: int, target_sr: in
     return chunk_mono_r.tobytes()
 
 
+def resample_chunk_mono_np(chunk: bytes, channels: int, orig_sr: int, target_sr: int, mode="sinc_best") -> np.ndarray:
+    """
+    将当前多通道音频数据块转换成单通道音频数据块，然后进行重采样，返回 Numpy 数组
+
+    Args:
+        chunk: 多通道音频数据块
+        channels: 通道数
+        orig_sr: 原始采样率
+        target_sr: 目标采样率
+        mode: 重采样模式，可选：'sinc_best' | 'sinc_medium' | 'sinc_fastest' | 'zero_order_hold' | 'linear'
+
+    Return:
+        单通道音频数据块
+    """
+    if channels == 1:
+        chunk_mono = np.frombuffer(chunk, dtype=np.int16)
+        chunk_mono = chunk_mono.astype(np.float32)
+    else:
+        # (length * channels,)
+        chunk_np = np.frombuffer(chunk, dtype=np.int16)
+        # (length, channels)
+        chunk_np = chunk_np.reshape(-1, channels)
+        # (length,)
+        chunk_mono = np.mean(chunk_np.astype(np.float32), axis=1)
+
+    ratio = target_sr / orig_sr
+    chunk_mono_r = samplerate.resample(chunk_mono, ratio, converter_type=mode)
+    chunk_mono_r = np.round(chunk_mono_r).astype(np.int16)
+    return chunk_mono_r
+
+
 def resample_mono_chunk(chunk: bytes, orig_sr: int, target_sr: int, mode="sinc_best") -> bytes:
     """
     将当前单通道音频块进行重采样