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private func checkAndRespond(forRequest dataRequest: AVAssetResourceLoadingDataRequest) -> Bool {
        let downloadedData = self.mediaData
        let downloadedDataLength = Int64(downloadedData.count)
        
        let requestRequestedOffset = dataRequest.requestedOffset
        let requestRequestedLength = Int64(dataRequest.requestedLength)
        let requestCurrentOffset = dataRequest.currentOffset
        
        if downloadedDataLength < requestCurrentOffset {
            return false
        }
        
        let downloadedUnreadDataLength = downloadedDataLength - requestCurrentOffset
        let requestUnreadDataLength = requestRequestedOffset + requestRequestedLength - requestCurrentOffset
        let respondDataLength = min(requestUnreadDataLength, downloadedUnreadDataLength)
            
        dataRequest.respond(
            with: downloadedData.subdata(
                in: Range(Int(requestCurrentOffset)...Int(respondDataLength))
            )
        )
        
        let requestEndOffset = requestRequestedOffset + requestRequestedLength
        
        return requestCurrentOffset >= requestEndOffset
    }

if requestCurrentOffset > respondDataLength { return false }