caojunfei
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audio_codebuddy


			
				
					
						
						
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js"><span class="cstat-no" title="statement not covered" >/**<span class="fstat-no" title="function not covered" ><span class="branch-0 cbranch-no" title="branch not covered" ></span></span></span>
 * FFmpeg 处理器使用示例
 * 演示如何在 OSS 模式下处理音频/视频
 */
&nbsp;
import { FFmpegProcessor } from './ffmpeg.processor';
&nbsp;
// ==================== 示例 1: 合并多个音频（OSS URL） ====================
<span class="cstat-no" title="statement not covered" >async function mergeAudioFromOSS() {</span>
  // OSS 音频 URL 数组
<span class="cstat-no" title="statement not covered" >  const audioUrls = [</span>
<span class="cstat-no" title="statement not covered" >    'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/part1.mp3',</span>
<span class="cstat-no" title="statement not covered" >    'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/part2.mp3',</span>
<span class="cstat-no" title="statement not covered" >    'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/part3.mp3',</span>
<span class="cstat-no" title="statement not covered" >  ];</span>
&nbsp;
  // 自动下载、合并、上传
<span class="cstat-no" title="statement not covered" >  const mergedUrl = await FFmpegProcessor.mergeAudio(audioUrls, 'mp3');</span>
<span class="cstat-no" title="statement not covered" >  console.log('合并后的音频:', mergedUrl);</span>
  // 输出: https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/xxx/merged.mp3
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ==================== 示例 2: 混合音频和视频 ====================
<span class="cstat-no" title="statement not covered" >async function mergeAudioVideo() {</span>
<span class="cstat-no" title="statement not covered" >  const audioUrl = 'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/narration.mp3';</span>
<span class="cstat-no" title="statement not covered" >  const videoUrl = 'https://bucket.oss-cn-hangzhou.aliyuncs.com/video/456/visual.mp4';</span>
<span class="cstat-no" title="statement not covered" >  const bgmUrl = 'https://bucket.oss-cn-hangzhou.aliyuncs.com/material/bgm.mp3';</span>
&nbsp;
  // 合并音频、视频和背景音乐
<span class="cstat-no" title="statement not covered" >  const finalUrl = await FFmpegProcessor.mergeAudioVideo(</span>
<span class="cstat-no" title="statement not covered" >    audioUrl,</span>
<span class="cstat-no" title="statement not covered" >    videoUrl,</span>
<span class="cstat-no" title="statement not covered" >    bgmUrl,</span>
<span class="cstat-no" title="statement not covered" >    0.3 // 背景音乐音量 30%</span>
<span class="cstat-no" title="statement not covered" >  );</span>
<span class="cstat-no" title="statement not covered" >  console.log('最终视频:', finalUrl);</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ==================== 示例 3: 获取音频时长 ====================
<span class="cstat-no" title="statement not covered" >async function getAudioDuration() {</span>
<span class="cstat-no" title="statement not covered" >  const audioUrl = 'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/audio.mp3';</span>
  
  // 自动下载、获取时长、清理临时文件
<span class="cstat-no" title="statement not covered" >  const duration = await FFmpegProcessor.getDuration(audioUrl);</span>
<span class="cstat-no" title="statement not covered" >  console.log(`音频时长: ${duration}秒`);</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ==================== 示例 4: 转换音频格式 ====================
<span class="cstat-no" title="statement not covered" >async function convertAudioFormat() {</span>
<span class="cstat-no" title="statement not covered" >  const wavUrl = 'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/audio.wav';</span>
  
  // WAV 转 MP3
<span class="cstat-no" title="statement not covered" >  const mp3Url = await FFmpegProcessor.convertFormat(wavUrl, 'mp3', '192k');</span>
<span class="cstat-no" title="statement not covered" >  console.log('MP3 文件:', mp3Url);</span>
  
  // MP3 转 AAC
<span class="cstat-no" title="statement not covered" >  const aacUrl = await FFmpegProcessor.convertFormat(mp3Url, 'aac', '128k');</span>
<span class="cstat-no" title="statement not covered" >  console.log('AAC 文件:', aacUrl);</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ==================== 示例 5: 裁剪音频 ====================
<span class="cstat-no" title="statement not covered" >async function trimAudio() {</span>
<span class="cstat-no" title="statement not covered" >  const audioUrl = 'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/full.mp3';</span>
  
  // 从 10 秒开始，裁剪 30 秒
<span class="cstat-no" title="statement not covered" >  const trimmedUrl = await FFmpegProcessor.trimAudio(audioUrl, 10, 30);</span>
<span class="cstat-no" title="statement not covered" >  console.log('裁剪后的音频:', trimmedUrl);</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ==================== 示例 6: 调整音量 ====================
<span class="cstat-no" title="statement not covered" >async function adjustVolume() {</span>
<span class="cstat-no" title="statement not covered" >  const audioUrl = 'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/audio.mp3';</span>
  
  // 音量加倍
<span class="cstat-no" title="statement not covered" >  const louderUrl = await FFmpegProcessor.adjustVolume(audioUrl, 2.0);</span>
<span class="cstat-no" title="statement not covered" >  console.log('音量加倍:', louderUrl);</span>
  
  // 音量减半
<span class="cstat-no" title="statement not covered" >  const quieterUrl = await FFmpegProcessor.adjustVolume(audioUrl, 0.5);</span>
<span class="cstat-no" title="statement not covered" >  console.log('音量减半:', quieterUrl);</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ==================== 示例 7: 混合使用本地和 OSS 文件 ====================
<span class="cstat-no" title="statement not covered" >async function mixLocalAndOSS() {</span>
  // 混合本地文件和 OSS URL
<span class="cstat-no" title="statement not covered" >  const mixedUrls = [</span>
<span class="cstat-no" title="statement not covered" >    './uploads/audio/123/local.mp3',           // 本地文件</span>
<span class="cstat-no" title="statement not covered" >    '/uploads/audio/456/another.mp3',          // 本地文件</span>
<span class="cstat-no" title="statement not covered" >    'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/789/remote.mp3', // OSS</span>
<span class="cstat-no" title="statement not covered" >  ];</span>
&nbsp;
  // FFmpegProcessor 会自动处理
<span class="cstat-no" title="statement not covered" >  const mergedUrl = await FFmpegProcessor.mergeAudio(mixedUrls, 'mp3');</span>
<span class="cstat-no" title="statement not covered" >  console.log('合并结果:', mergedUrl);</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ==================== 示例 8: 在 TTS 服务中使用 ====================
// 在 tts.service.ts 中的使用示例
<span class="cstat-no" title="statement not covered" >async function ttsServiceExample() {</span>
<span class="cstat-no" title="statement not covered" >  const segmentFiles = [</span>
<span class="cstat-no" title="statement not covered" >    'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/segment_0.mp3',</span>
<span class="cstat-no" title="statement not covered" >    'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/segment_1.mp3',</span>
<span class="cstat-no" title="statement not covered" >    'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/segment_2.mp3',</span>
<span class="cstat-no" title="statement not covered" >  ];</span>
&nbsp;
  // 合并所有分段
<span class="cstat-no" title="statement not covered" >  const finalAudioUrl = await FFmpegProcessor.mergeAudio(segmentFiles, 'mp3');</span>
  
  // 获取时长
<span class="cstat-no" title="statement not covered" >  const duration = await FFmpegProcessor.getDuration(finalAudioUrl);</span>
  
<span class="cstat-no" title="statement not covered" >  console.log('最终音频:', finalAudioUrl);</span>
<span class="cstat-no" title="statement not covered" >  console.log('时长:', duration, '秒');</span>
  
<span class="cstat-no" title="statement not covered" >  return {</span>
<span class="cstat-no" title="statement not covered" >    audioUrl: finalAudioUrl,</span>
<span class="cstat-no" title="statement not covered" >    duration,</span>
<span class="cstat-no" title="statement not covered" >  };</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ==================== 示例 9: 视频生成中使用 ====================
// 在 video-generator 中的使用示例
<span class="cstat-no" title="statement not covered" >async function videoGeneratorExample() {</span>
<span class="cstat-no" title="statement not covered" >  const chapter = {</span>
<span class="cstat-no" title="statement not covered" >    audioUrl: 'https://bucket.oss-cn-hangzhou.aliyuncs.com/audio/123/audio.mp3',</span>
<span class="cstat-no" title="statement not covered" >    videoUrl: 'https://bucket.oss-cn-hangzhou.aliyuncs.com/video/456/visual.mp4',</span>
<span class="cstat-no" title="statement not covered" >  };</span>
&nbsp;
  // 合并音频和视频
<span class="cstat-no" title="statement not covered" >  const finalVideoUrl = await FFmpegProcessor.mergeAudioVideo(</span>
<span class="cstat-no" title="statement not covered" >    chapter.audioUrl,</span>
<span class="cstat-no" title="statement not covered" >    chapter.videoUrl</span>
<span class="cstat-no" title="statement not covered" >  );</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >  console.log('最终视频:', finalVideoUrl);</span>
<span class="cstat-no" title="statement not covered" >  return finalVideoUrl;</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
// ==================== 处理流程说明 ====================
/*
使用 OSS 时的 FFmpeg 处理流程：
&nbsp;
1. 检测输入 URL 类型
   - 本地路径（/uploads/ 或 ./） -&gt; 直接使用
   - 远程 URL（http/https） -&gt; 下载到临时目录
&nbsp;
2. 执行 FFmpeg 处理
   - 合并音频
   - 合并音视频
   - 格式转换
   - 裁剪/调整音量
   - 等等...
&nbsp;
3. 上传结果到 OSS
   - 使用 storageService.uploadAudio() 或 uploadVideo()
   - 自动根据 STORAGE_TYPE 选择存储方式
&nbsp;
4. 清理临时文件
   - 自动删除下载的临时文件
   - 自动删除处理后的临时文件
&nbsp;
注意：
- 所有临时文件保存在 server/temp/ 目录
- 处理完成后自动清理
- 支持失败时的异常清理（finally 块）
*/
&nbsp;
// ==================== 性能优化建议 ====================
/*
1. 并发下载
   - 多个文件可以并发下载
   - 使用 Promise.all() 加速
&nbsp;
2. 临时文件管理
   - 定期清理 temp 目录
   - 使用 cron 任务定时清理
&nbsp;
3. 超时设置
   - 下载超时: 60秒
   - 合并超时: 5-10分钟
   - 根据实际情况调整
&nbsp;
4. 错误处理
   - 捕获异常并清理临时文件
   - 记录详细日志便于调试
*/
&nbsp;
export {
  mergeAudioFromOSS,
  mergeAudioVideo,
  getAudioDuration,
  convertAudioFormat,
  trimAudio,
  adjustVolume,
  mixLocalAndOSS,
  ttsServiceExample,
  videoGeneratorExample,
};
&nbsp;</pre></td></tr></table></pre>

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