我尝试将Apple示例代码（FairPlay Streaming Server SDK v4.2.0）用于FairPlay在线播放，但它没有'；行不通

我尝试用HLSCatalogWithFPS-AVContentKeySession苹果示例代码播放fairplay视频。 我只修改了2个func“func requestApplicationCertificate（）抛出->数据”和“func requestContentKeyFromKeySecurityModule（spcData:Data，assetID:String）抛出->数据”，并在stream.plist上添加视频url

func requestApplicationCertificate（）抛出->数据{

    let certificateURL = Bundle.main.url(forResource: "fairplay", withExtension: "cer")

    let applicationCertificate: Data? = try? Data(contentsOf: certificateURL!)

    return applicationCertificate!

}



func requestContentKeyFromKeySecurityModule(spcData: Data, assetID: String) throws -> Data {
    // MARK: ADAPT - You must implement this method to request a CKC from your KSM.

    var ckcData: Data? = nil

    let url = URL(string: "http://drmlab.ott.hinet.net:8064/fpsa/v1.0/?deviceId=NDJhNjQ1MmQtZGFkZC0zNjE3LTllOTUtMmNlNWVlMzYwZmRi")!

    var request = URLRequest(url: url)

    let postString = "spc=\(spcData.base64EncodedString())&assetId=\(assetID)"

    let postData = postString.data(using: .utf8, allowLossyConversion: true)       

    request.httpMethod = "POST"

    request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")

    request.setValue(String(postData!.count), forHTTPHeaderField: "Content-Length")

    request.httpBody = postData

    let session = URLSession.shared

    let semaphore = DispatchSemaphore(value: 0)    

    let task = session.dataTask(with: request) { (data, response, error) in

        guard let data = data, error == nil else {

            print("error=\(error)")

            return

        }      

        print("response = \(response)")       

        let responseData = String(data: data, encoding: .utf8)

        print("responseData = \(responseData)")

        print("ckc = \(ckcData = Data(base64Encoded: responseData!))")

        semaphore.signal()

    }
       task.resume()

    _ = semaphore.wait(timeout: DispatchTime.distantFuture)

    return ckcData!

}

当我收到错误信息时，我如何解决它

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我认为您应该尝试创建base64编码的url安全src数据

let base64spc=spcData.base64EncodedString（）.trimmingCharacters（in:.空格和换行符）
设base64UrlSafe=base64spc.replacingOccurrences（of:“+”，with:“-”）.replacingOccurrences（of:“/”，with:“”）.replacingOccurrences（of:“=”，with:”）
让postString=“spc=\（base64UrlSafe.base64EncodedString（））&assetId=\（assetId）”

错误消息表明服务器无法解析SPC以找到assetId。您是否使用对streamingContentKeyRequestData（…）的调用创建SPC？您的服务器希望您如何通过SPC？（我们没有相关文件）