Encoding of AVMetadataItem

问题:

I have a AVMetadataItem which has fields encoded in CP1251 (Cyrillic). After reading item.stringValue I get garbage - incorrectly encoded string. I've tried converting that string to raw UTF8 and then creating a new string using the CP1251 encoding - no luck, result is nil. Tried taking the item.dataValue - no dice, it contains a raw list data (starting with bplist...).

Any ideas are very appreciated.

Thanks in advance.

回答1:

Swift 2.0 solution:

let origTitleMeta: NSData = (<AVMetadataItem>.timedMetadata?.first?.stringValue?.dataUsingEncoding(NSISOLatin1StringEncoding, allowLossyConversion: true))!

let convertedTitleMeta: String = String(data: origMeta, encoding: NSUTF8StringEncoding)!

回答2:

I've ended up using Mike Ash's NSPropertyListReader_binary1 and getting the raw data and then mangling it so that NSString would it it's encoding.

Horrible - but worked.

回答3:

I have AVMetadataItem extension for this:

extension AVMetadataItem {

    /// stringValue: ISO-8859-1 → UTF-8
    var utf8String: String? {
        guard let data = stringValue?.data(using: String.Encoding.isoLatin1, allowLossyConversion: true) else {
            return nil
        }
        return String(data: data as Data, encoding: String.Encoding.utf8)
    }
}

回答4:

Swift 3.0 solution:

let data: Data = item.timedMetadata!.first!.stringValue.data(using: String.Encoding.isoLatin1, allowLossyConversion: true)!

let title: String = String(data: data as Data, encoding: String.Encoding.utf8)!