//Generates thumbnails by running ffmpeg on the file, and saving them in a temp folder.
private void GenerateThumbnails()
{
double tween = Duration / (Rows * Columns);
_thumbDir = "temp/temp_" + (FilePath.GetHashCode() + DateTime.Now.Millisecond);
Directory.CreateDirectory(_thumbDir);
var proc = new Process
{
StartInfo = new ProcessStartInfo
{
FileName = "ffmpeg",
Arguments = $"-i \"{FilePath}\" -vf fps=1/{tween} {_thumbDir}/img%05d.png",
UseShellExecute = false,
CreateNoWindow = true
}
};
try
{
proc.Start();
proc.WaitForExit();
proc.Dispose();
}
catch
{
_logger.LogError($"ffmpeg failed to start.");
throw new FfmpegException();
}
int count = 0;
foreach (string s in Directory.GetFiles(_thumbDir))
{
Thumbnails.Add(ThumbnailFactory.CreateThumbnail(s, ++count * tween));
}
}
private bool CreateThumnail()
{
if (HasCurrentThumbnail() == true)
return true;
ThumbnailFactory t = new ThumbnailFactory(ThumbnailSize.Normal);
// can we attempt to create it?
if (!t.CanThumbnail(filename, Mime, CurrentMtime)) {
Console.WriteLine(Catalog.GetString("Cannot create thumbnail for: {0}"), filename);
return false;
}
// Generate and save thumbnail
Pixbuf tmp = t.GenerateThumbnail(filename, Mime);
t.SaveThumbnail(tmp, filename, CurrentMtime);
return true;
}
// Grab thumbnail
public Pixbuf Thumbnail()
{
string existing;
// Totaly ignore removed wps
if (removed)
return null;
// Cached thumb nail? Just make sure it's current
if (ThumbCache != null && HasCurrentThumbnail() == true)
return ThumbCache;
else
ThumbCache = null;
// Attempt to create a new thumbnail (or at least check if there is an old valid one)
if (CreateThumnail() == false)
return null;
ThumbnailFactory t = new ThumbnailFactory(ThumbnailSize.Normal);
// Grab the thumb
existing = t.Lookup(filename, CurrentMtime);
Pixbuf thumb = new Pixbuf(existing);
// Figure out the scale for previews
int x, y;
switch (Res.ResolutionList.AspectType(w,h)) {
case Res.Aspect.ASPECT_43:
x = 64;
y = 48;
break;
case Res.Aspect.ASPECT_WIDE:
x = 64;
y = 36;
break;
case Res.Aspect.ASPECT_OTHER:
default:
x = 64;
y = 64;
break;
}
// for really small images, do our own resizing; hopefully there won't be too many
if (thumb.Width < x || thumb.Height < y) {
ThumbCache = thumb.ScaleSimple(x, y, Gdk.InterpType.Bilinear);
} else {
ThumbCache = Gnome.Thumbnail.ScaleDownPixbuf(thumb, x, y);
}
thumb.Dispose();
return ThumbCache;
}