从ID3标签/转换功能从Java到Objective-C获取专辑图片 [英] Get album artwork from ID3 tag/Convert function from Java to Objective-C

问题描述

我有以下问题要问：

如何使用iOS应用程序编译taglib？

How do you compile taglib with an iOS application?

我有点困惑，因为我将文件夹添加到我的项目中，尝试编译它，但它失败了1640错误。

I'm a bit confused as I added the folder into my project, tried to compile it, but instead it failed with 1640 errors.

我如何制作它成功编译 - 我问的原因是taglib允许从标签中提取专辑图片。

How do I make it successfully compile - the reason why I ask is taglib allows for the extraction of album artwork from a tag.

如果有人知道基于Objective-C的专辑图片提取类它会有所帮助 - 我不知道为什么Apple不会在Core Foundation中添加这样做的方法 - 因为有一些方法可以从ID3标签中提取一些数据。

If anyone knows an Objective-C based album artwork extraction class it would help - I don't know why Apple don't add a way of doing this in Core Foundation - because there are methods for extracting some of the data from an ID3 tag.

我不明白为什么没有一些 Objective-C的方式。

I can't see why there isn't some Objective-C way of doing it.

任何帮助表示感谢。

编辑：

经过几个小时的尝试，我发现了一个Java函数这里似乎做得很好，但我还没有得到关于如何转换的线索它是Objective-C（或者更不用说C ++），因为它的类型似乎与Objective-C / C ++中的类型完全不同。

如果有人知道转换它的方法，它会真的帮助，因为这似乎是我最后的选择，因为我已经尝试了很多其他选项。

After hours upon hours of trying to do this, I've found a Java function here that seems to do the job fine, but I haven't got a clue on how to convert it to Objective-C (or let alone C++ for that matter), as its types seem to be completely different from those that are in Objective-C/C++.

If anyone knows of a way to convert this it would really help, as this seems as my last option as I've tried so many others.

推荐答案

- (void)loadArtworksForFileAtPath:(NSString *)path completion:(void (^)(NSArray *))completion
{
    NSURL *u = [NSURL fileURLWithPath:path];
    AVURLAsset *a = [AVURLAsset URLAssetWithURL:u options:nil];
    NSArray *k = [NSArray arrayWithObjects:@"commonMetadata", nil];

    [a loadValuesAsynchronouslyForKeys:k completionHandler: ^{
        NSArray *artworks = [AVMetadataItem metadataItemsFromArray:a.commonMetadata
             withKey:AVMetadataCommonKeyArtwork keySpace:AVMetadataKeySpaceCommon];

         NSMutableArray *artworkImages = [NSMutableArray array];
         for (AVMetadataItem *i in artworks)
         {
             NSString *keySpace = i.keySpace;
             UIImage *im = nil;

             if ([keySpace isEqualToString:AVMetadataKeySpaceID3])
             {
                 NSDictionary *d = [i.value copyWithZone:nil];
                 im = [UIImage imageWithData:[d objectForKey:@"data"]];
             }
             else if ([keySpace isEqualToString:AVMetadataKeySpaceiTunes])
                 im = [UIImage imageWithData:[i.value copyWithZone:nil]];

             if (im)
                 [artworkImages addObject:im];
         }

         completion(artworkImages);
     }];
}

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