from pydub import AudioSegment
import os
import subprocess

def process_audio(audio_path, bgm_path=None):
    """
    处理音频：混合背景音乐
    """
    audio = AudioSegment.from_file(audio_path)
    
    if bgm_path and os.path.exists(bgm_path):
        bgm = AudioSegment.from_file(bgm_path)
        if len(bgm) < len(audio):
            bgm = bgm * (len(audio) // len(bgm) + 1)
        bgm = bgm[:len(audio)] - 15  # 降低音量
        mixed_audio = audio.overlay(bgm)
    else:
        mixed_audio = audio
    
    return mixed_audio

def export_audio(audio_segment, output_path):
    """
    导出音频文件
    """
    audio_segment.export(output_path, format="wav")