iOS -- 获取音频长度

1.获取音频毫秒长度

AVURLAsset *audioAsset=[AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:[self.dic getStringValueForKey:@"path" defaultValue:@""] ]options:nil];
    CMTime audioDuration = audioAsset.duration;
    float audioDurationSeconds = CMTimeGetSeconds(audioDuration);

2.获取音视频总秒数

    NSDictionary *opts = [NSDictionary dictionaryWithObject:@(NO) forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
    AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:[self.dic getStringValueForKey:@"path" defaultValue:@"" ]]  options:opts]; // 初始化视频媒体文件
    NSUInteger second = 0;
    second = ceil(urlAsset.duration.value / urlAsset.duration.timescale); // 获取视频总时长,单位秒