FileData GetMovieMediaFile(NSDictionary info)
{
var url = info[UIImagePickerController.MediaURL] as NSUrl;
if (url == null)
{
return(null);
}
AVUrlAsset asset = new AVUrlAsset(url);
// 文件描述
var track = asset.GetTracks(AVMediaTypes.Video)[0];
TimeSpan ts = TimeSpan.FromSeconds(track.TimeRange.Duration.Seconds);
string desc = $"{ts.Minutes.ToString("D2")}:{ts.Seconds.ToString("D2")}";
// 生成缩略图
string thumbPath = null;
var segs = track.Segments;
if (segs != null && segs.Length > 0)
{
CMTime startTime = CMTime.Invalid;
for (int i = 0; i < segs.Length; i++)
{
if (!segs[i].Empty)
{
startTime = segs[i].TimeMapping.Target.Start;
break;
}
}
if (!startTime.IsInvalid)
{
var assetGen = new AVAssetImageGenerator(asset);
assetGen.AppliesPreferredTrackTransform = true;
using (var firstImg = assetGen.CopyCGImageAtTime(startTime, out var r, out var error))
{
if (error == null)
{
UIImage img = new UIImage(firstImg);
desc += $" ({img.CGImage.Width} x {img.CGImage.Height})";
thumbPath = CreateThumbnail(img, true);
}
}
}
}
var path = System.IO.Path.Combine(Kit.CachePath, Kit.NewGuid + ".mp4");
try
{
File.Move(url.Path, path);
}
catch (Exception ex)
{
Debug.WriteLine($"Unable to move file, trying to copy. {ex.Message}");
try
{
File.Copy(url.Path, path);
File.Delete(url.Path);
}
catch (Exception)
{
Debug.WriteLine($"Unable to copy/delete file, will be left around :( {ex.Message}");
}
}
var fd = new FileData(path, System.IO.Path.GetFileName(path), (ulong)new FileInfo(path).Length);
fd.Desc = desc;
fd.ThumbPath = thumbPath;
return(fd);
}
