获取本地mp3时长

- (void)setUpReadTimeAndRecordTimeWithFilePath:(NSString *)filePath

{

    NSURL *url = [NSURL fileURLWithPath:filePath];

    AVURLAsset *audioAsset = [AVURLAsset URLAssetWithURL:url options:nil];

    CMTime audioDuration = audioAsset.duration;

    float audioDurationSeconds = CMTimeGetSeconds(audioDuration);

    self.readTime = audioDurationSeconds;

    self.recorderTimeLimit = self.readTime;

}