流式传输 - 如何使用AVAsset获取歌曲名称

Question

我正在尝试从网址加载强大并获取当前正在播放的歌曲的标题。

宋正在播放。一切都很好，直到我点击这个“得到歌曲标题”的墙。可悲的是NSLog(@"key = %@, value = %@", key, value);没有任何回报。几乎被困在这里。

AVURLAsset *newAsset =[AVURLAsset assetWithURL:audioFileURL];
    [newAsset loadValuesAsynchronouslyForKeys:keys completionHandler:^{

        NSError *error = nil;
        AVKeyValueStatus durationStatus = [newAsset statusOfValueForKey:@"commonMetadata" error:&error];

        switch (durationStatus) {
            case AVKeyValueStatusLoaded: {
                playerItem = [AVPlayerItem playerItemWithAsset:newAsset];
                self.player = [AVPlayer playerWithPlayerItem:playerItem];

                NSArray *songMeta = [newAsset commonMetadata];

                for (AVMetadataItem *item in songMeta ) {
                    NSString *key = [item commonKey];
                    NSString *value = [item stringValue];
                    NSLog(@"key = %@, value = %@", key, value);
                }

                break;
            }
            case AVKeyValueStatusFailed:
                NSLog(@"Failed");
                break;
            default:
                NSLog(@"Default");
                break;
        }
    }];

由于