Mp3Recorder.m 转MP3文件？

`#pragma mark - Path Utils
- (NSString *)cafPath
  {
  NSString *cafPath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"tmp.caf"];
  return cafPath;
  }
- (NSString *)mp3Path
  {
  NSString *mp3Path = [NSTemporaryDirectory() stringByAppendingPathComponent:@"mp3.caf"];
  return mp3Path;
  }`

后缀都是.caf

我去tmp文件夹看没有.mp3文件啊？
