/// <summary>
/// Generate the thumbnail image for this display object and save it to the file system. The routine may decide that
/// a file does not need to be generated, usually because it already exists. However, it will always be
/// created if the relevant flag is set on the parent <see cref="IGalleryObject" />. (Example: If
/// <see cref="IGalleryObject.RegenerateThumbnailOnSave" /> = true, the thumbnail file will always be created.) No data is
/// persisted to the data store.
/// </summary>
public override void GenerateAndSaveFile()
{
// If necessary, generate and save the thumbnail version of the video.
if (!(IsThumbnailImageRequired()))
{
return; // No thumbnail image required.
}
IGallerySettings gallerySetting = Factory.LoadGallerySetting(GalleryObject.GalleryId);
// Generate a temporary filename to store the thumbnail created by FFmpeg.
string tmpVideoThumbnailPath = Path.Combine(AppSetting.Instance.TempUploadDirectory, String.Concat(Guid.NewGuid().ToString(), ".jpg"));
// Request that FFmpeg create the thumbnail. If successful, the file will be created.
FFmpeg.GenerateThumbnail(GalleryObject.Original.FileNamePhysicalPath, tmpVideoThumbnailPath, gallerySetting.VideoThumbnailPosition, GalleryObject.GalleryId);
// Verify image was created from video, trying again using a different video position setting if necessary.
ValidateVideoThumbnail(tmpVideoThumbnailPath, gallerySetting.VideoThumbnailPosition);
// Determine file name and path of the thumbnail image. If a file name has already been previously
// calculated for this media object, re-use it. Otherwise generate a unique name.
var newFilename = GalleryObject.Thumbnail.FileName;
var newFilePath = GalleryObject.Thumbnail.FileNamePhysicalPath;
if (String.IsNullOrEmpty(newFilePath))
{
var thumbnailPath = HelperFunctions.MapAlbumDirectoryStructureToAlternateDirectory(this.GalleryObject.Original.FileInfo.DirectoryName, gallerySetting.FullThumbnailPath, gallerySetting.FullMediaObjectPath);
newFilename = GenerateJpegFilename(thumbnailPath, gallerySetting.ThumbnailFileNamePrefix);
newFilePath = Path.Combine(thumbnailPath, newFilename);
}
if (File.Exists(tmpVideoThumbnailPath))
{
// FFmpeg successfully created a thumbnail image the same size as the video. Now resize it to the width and height we need.
var size = ImageHelper.SaveImageFileAsJpeg(tmpVideoThumbnailPath, newFilePath, gallerySetting.MaxThumbnailLength, false, gallerySetting.ThumbnailImageJpegQuality);
var rotatedSize = ExecuteAutoRotation(newFilePath, gallerySetting.ThumbnailImageJpegQuality);
if (!rotatedSize.IsEmpty)
{
size = rotatedSize;
}
GalleryObject.Thumbnail.Width = (int)size.Width;
GalleryObject.Thumbnail.Height = (int)size.Height;
//using (Bitmap originalBitmap = new Bitmap(tmpVideoThumbnailPath))
//{
// var newSize = CalculateWidthAndHeight(new Size(originalBitmap.Width, originalBitmap.Height), gallerySetting.MaxThumbnailLength, false);
// // Get JPEG quality value (0 - 100). This is ignored if imgFormat = GIF.
// int jpegQuality = gallerySetting.ThumbnailImageJpegQuality;
// // Generate the new image and save to disk.
// var size = ImageHelper.SaveImageFile(originalBitmap, newFilePath, ImageFormat.Jpeg, newSize.Width, newSize.Height, jpegQuality);
// var rotatedSize = ExecuteAutoRotation(newFilePath, jpegQuality);
// if (!rotatedSize.IsEmpty)
// {
// size = rotatedSize;
// }
// GalleryObject.Thumbnail.Width = (int)size.Width;
// GalleryObject.Thumbnail.Height = (int)size.Height;
//}
try
{
// Now delete the thumbnail image created by FFmpeg, but no worries if an error happens. The file is in the temp directory
// which is cleaned out each time the app starts anyway.
File.Delete(tmpVideoThumbnailPath);
}
catch (IOException ex)
{
EventController.RecordError(ex, AppSetting.Instance, GalleryObject.GalleryId, Factory.LoadGallerySettings());
}
catch (UnauthorizedAccessException ex)
{
EventController.RecordError(ex, AppSetting.Instance, GalleryObject.GalleryId, Factory.LoadGallerySettings());
}
catch (NotSupportedException ex)
{
EventController.RecordError(ex, AppSetting.Instance, GalleryObject.GalleryId, Factory.LoadGallerySettings());
}
}
else
{
// FFmpeg didn't run or no thumbnail image was created by FFmpeg. Build a generic video thumbnail.
var thumbImagePath = Path.Combine(AppSetting.Instance.WebRootPath, GlobalConstants.GenericThumbnailDirectory, GlobalConstants.GenericVideoThumbnailFileName);
var size = ImageHelper.SaveImageFileAsJpeg(thumbImagePath, newFilePath, gallerySetting.MaxThumbnailLength, true, gallerySetting.ThumbnailImageJpegQuality);
GalleryObject.Thumbnail.Width = size.Width;
GalleryObject.Thumbnail.Height = size.Height;
//using (var ms = new MemoryStream(Resources.GenericThumbnailImage_Video))
//{
// using (var originalBitmap = new Bitmap(ms))
// {
// var newSize = CalculateWidthAndHeight(new Size(originalBitmap.Width, originalBitmap.Height), gallerySetting.MaxThumbnailLength, true);
// // Get JPEG quality value (0 - 100).
// int jpegQuality = gallerySetting.ThumbnailImageJpegQuality;
// // Generate the new image and save to disk.
// var size = ImageHelper.SaveImageFile(originalBitmap, newFilePath, ImageFormat.Jpeg, newSize.Width, newSize.Height, jpegQuality);
// GalleryObject.Thumbnail.Width = (int)size.Width;
// GalleryObject.Thumbnail.Height = (int)size.Height;
// }
//}
}
GalleryObject.Thumbnail.FileName = newFilename;
GalleryObject.Thumbnail.FileNamePhysicalPath = newFilePath;
int fileSize = (int)(GalleryObject.Thumbnail.FileInfo.Length / 1024);
GalleryObject.Thumbnail.FileSizeKB = (fileSize < 1 ? 1 : fileSize); // Very small files should be 1, not 0.
}
