Hi all,
I was wondering if it is possible to calculate the bandwidth of a download in progress? I am using AVAggregateAssetDownloadTask From Apple's sample code I know the best way to show "download progress" is by doing something like this:
func urlSession(_ session: URLSession, aggregateAssetDownloadTask: AVAggregateAssetDownloadTask,
didLoad timeRange: CMTimeRange, totalTimeRangesLoaded loadedTimeRanges: [NSValue],
timeRangeExpectedToLoad: CMTimeRange, for mediaSelection: AVMediaSelection) {
...
var percentComplete = 0.0
for value in loadedTimeRanges {
let loadedTimeRange: CMTimeRange = value.timeRangeValue
percentComplete +=
loadedTimeRange.duration.seconds / timeRangeExpectedToLoad.duration.seconds
...
// The following values are wrong when comparing actual size of files on disk.
let fetchedBytes = counter.string(fromByteCount: aggregateAssetDownloadTask.countOfBytesReceived)
let expectedBytes = counter.string(fromByteCount: aggregateAssetDownloadTask.countOfBytesExpectedToReceive)
}
}
AVAggregateAssetDownloadTask also has URLSessionTasks field countOfBytesReceived and countOfBytesExpectedToReceive
Trouble is if I try to read either of these two, as per the code above, the count is incorrect. I.e. if I check the size of the movpkg on disk, it is quite off from what countOfBytesReceived states.
My questions are:
- Is a time range calculation still the best way to depict download progress
- Is there a a way to get correct updates of the movpkg size as the download progresses, so that I can calculate speed?