feat: 添加浅色主题支持

- 配置浅色主题配色方案和 CSS 变量
- 修复组件在浅色模式下的样式适配
- 统一文字颜色类名使用 CSS 变量
- 优化玻璃效果在浅色主题下的显示

audio_utils.py

@@ -0,0 +1,161 @@
+"""
+音频处理辅助工具
+支持格式转换、音频切片等
+"""
+
+import os
+import subprocess
+from typing import Tuple, Optional
+import numpy as np
+
+
+def get_audio_info(audio_path: str) -> dict:
+    """
+    获取音频文件信息
+    
+    Returns:
+        dict: {
+            "duration": float,  # 秒
+            "sample_rate": int,
+            "channels": int,
+            "format": str
+        }
+    """
+    try:
+        import soundfile as sf
+        info = sf.info(audio_path)
+        return {
+            "duration": info.duration,
+            "sample_rate": info.samplerate,
+            "channels": info.channels,
+            "format": info.format
+        }
+    except ImportError:
+        # 降级方案：使用 ffprobe
+        import json
+        cmd = [
+            "ffprobe", "-v", "quiet",
+            "-print_format", "json",
+            "-show_format", "-show_streams",
+            audio_path
+        ]
+        result = subprocess.run(cmd, capture_output=True, text=True)
+        data = json.loads(result.stdout)
+        
+        audio_stream = next((s for s in data.get("streams", []) if s.get("codec_type") == "audio"), {})
+        duration = float(data.get("format", {}).get("duration", 0))
+        
+        return {
+            "duration": duration,
+            "sample_rate": int(audio_stream.get("sample_rate", 16000)),
+            "channels": int(audio_stream.get("channels", 1)),
+            "format": audio_stream.get("codec_name", "unknown")
+        }
+
+
+def convert_to_wav(input_path: str, output_path: Optional[str] = None, sample_rate: int = 16000) -> str:
+    """
+    转换音频为 WAV 格式（16kHz 单声道）
+    
+    Args:
+        input_path: 输入文件路径
+        output_path: 输出文件路径（可选）
+        sample_rate: 采样率，默认 16000
+    
+    Returns:
+        输出文件路径
+    """
+    if output_path is None:
+        output_path = tempfile.NamedTemporaryFile(suffix=".wav", delete=False).name
+    
+    cmd = [
+        "ffmpeg", "-y",  # 覆盖已存在的文件
+        "-i", input_path,
+        "-ar", str(sample_rate),  # 采样率
+        "-ac", "1",  # 单声道
+        "-acodec", "pcm_s16le",  # 16bit PCM
+        output_path
+    ]
+    
+    subprocess.run(cmd, capture_output=True, check=True)
+    return output_path
+
+
+def slice_audio(audio_path: str, start: float, end: float, output_path: Optional[str] = None) -> str:
+    """
+    切片音频
+    
+    Args:
+        audio_path: 输入文件路径
+        start: 开始时间（秒）
+        end: 结束时间（秒）
+        output_path: 输出文件路径
+    
+    Returns:
+        输出文件路径
+    """
+    if output_path is None:
+        output_path = tempfile.NamedTemporaryFile(suffix=".wav", delete=False).name
+    
+    cmd = [
+        "ffmpeg", "-y",
+        "-i", audio_path,
+        "-ss", str(start),
+        "-to", str(end),
+        "-c", "copy",  # 无损复制
+        output_path
+    ]
+    
+    subprocess.run(cmd, capture_output=True, check=True)
+    return output_path
+
+
+def merge_audio(audio_paths: list, output_path: Optional[str] = None) -> str:
+    """
+    合并多个音频文件
+    
+    Args:
+        audio_paths: 音频文件路径列表
+        output_path: 输出文件路径
+    
+    Returns:
+        输出文件路径
+    """
+    if output_path is None:
+        output_path = tempfile.NamedTemporaryFile(suffix=".wav", delete=False).name
+    
+    # 创建临时文件列表
+    list_file = tempfile.NamedTemporaryFile(mode='w', suffix='.txt', delete=False)
+    for path in audio_paths:
+        list_file.write(f"file '{path}'\n")
+    list_file.close()
+    
+    cmd = [
+        "ffmpeg", "-y",
+        "-f", "concat",
+        "-safe", "0",
+        "-i", list_file.name,
+        "-c", "copy",
+        output_path
+    ]
+    
+    subprocess.run(cmd, capture_output=True, check=True)
+    
+    # 清理临时文件
+    os.unlink(list_file.name)
+    
+    return output_path
+
+
+def is_ffmpeg_available() -> bool:
+    """检查 ffmpeg 是否可用"""
+    try:
+        subprocess.run(["ffmpeg", "-version"], capture_output=True, check=True)
+        return True
+    except (subprocess.CalledProcessError, FileNotFoundError):
+        return False
+
+
+if __name__ == "__main__":
+    # 测试
+    print("FFmpeg 可用:", is_ffmpeg_available())