我想在Swift中流式传输来自Internet的音频，但还没有找到正确的功能示例。在Objective-CAVPlayerItem*playerItem=[AVPlayerItemplayerItemWithURL:[NSURLURLWithString:streamURL]];[playerItemaddObserver:selfforKeyPath:@"timedMetadata"options:NSKeyValueObservingOptionNewcontext:nil];music=[AVPlayerplayerWithPlayerItem:playerItem];[musi