如何更改 CreationDate 资源值

Question

我正在编写一个录音应用程序，使用户能够 trim 部分以前的录音并将它们连接成一个新录音。

我的问题是：假设我录制了一个小时长的曲目，我想 trim 该曲目的前 2 分钟。当我导出这 2 分钟时，该曲目的创建日期将是 "now"，我需要它与这 2 分钟实际发生的日期相匹配。

所以基本上我正在尝试修改轨道 Url 资源值，但我只想更改创建日期。

有办法吗？或者有没有办法添加新的资源值键？或将所需日期附加到 url?

的方法

func trimStatringPoint(_ from: Date, startOffSet: TimeInterval, duration: TimeInterval, fileName: String, file: URL, completion: fileExportaionBlock?) {

    if let asset = AVURLAsset(url: file) as AVAsset? {
        var trimmedFileUrl = documentsDirectory().appendingPathComponent(fileName)
        let exporter = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetAppleM4A)
        exporter?.outputFileType = AVFileTypeAppleM4A
        exporter?.outputURL = trimmedFileUrl
        let start = CMTimeMake(Int64(startOffSet), 1)
        let end = CMTimeMake(Int64(startOffSet + duration), 1)
        exporter?.timeRange = CMTimeRangeFromTimeToTime(start, end)

        exporter?.exportAsynchronously { handler in

            if exporter?.status != AVAssetExportSessionStatus.completed {
                print("Error while exporting \(exporter?.error?.localizedDescription ?? "unknown")")
                completion?(nil)
                return
            }
        }
        //------------------------------------------------------
        // this code needs to be replaced
        do {
                var resourceValus = URLResourceValues()
                resourceValus.creationDate = from
                try trimmedFileUrl.setResourceValues(resourceValus)
        } catch {
            deleteFile(atPath: trimmedFileUrl)
            print("Error while setting date - \(error.localizedDescription)")
            completion?(nil)
            return
        }
        //------------------------------------------------------
        completion?(trimmedFileUrl)
    }

Answer 1

您试过修改导出录音的元数据吗？ https://developer.apple.com/documentation/avfoundation/avmetadatacommonkeycreationdate

AVMutableMetadataItem *item = [AVMutableMetadataItem metadataItem];
metaItem.key = AVMetadataCommonKeyCreationDate;
metaItem.keySpace = AVMetadataKeySpaceCommon;
metaItem.value = [NSDate date];
NSArray *metadata = @{ metaItem };
AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:composition presetName:AVAssetExportPresetMediumQuality];
    exportSession.metadata = metadata;

如何更改 CreationDate 资源值

How to change CreationDate Resource Value

ios

swift

swift3

avfoundation

nsfilemanager