示例#1
0
        // Returns false is no snapshot generation was required, true otherwise
        private async Task <Boolean> GenerateThumbnail(VideoItem videoItem)
        {
            if (videoItem.IsPictureLoaded)
            {
                return(false);
            }
            try
            {
                if (ContinueIndexing != null)
                {
                    await ContinueIndexing.Task;
                    ContinueIndexing = null;
                }

                WriteableBitmap      image = null;
                StorageItemThumbnail thumb = null;
                // If file is a mkv, we save the thumbnail in a VideoPic folder so we don't consume CPU and resources each launch
                if (VLCFileExtensions.MFSupported.Contains(videoItem.Type.ToLower()))
                {
                    if (await videoItem.LoadFileFromPath())
                    {
                        thumb = await ThumbsService.GetThumbnail(videoItem.File);
                    }
                }
                // If MF thumbnail generation failed or wasn't supported:
                if (thumb == null)
                {
                    if (await videoItem.LoadFileFromPath() || !string.IsNullOrEmpty(videoItem.Token))
                    {
                        var res = await ThumbsService.GetScreenshot(videoItem.GetMrlAndFromType(true).Item2);

                        image = res?.Bitmap();
                    }
                }

                if (thumb == null && image == null)
                {
                    return(false);
                }
                // RunAsync won't await on the lambda it receives, so we need to do it ourselves
                var tcs = new TaskCompletionSource <bool>();
                await DispatchHelper.InvokeAsync(CoreDispatcherPriority.Low, async() =>
                {
                    if (thumb != null)
                    {
                        image = new WriteableBitmap((int)thumb.OriginalWidth, (int)thumb.OriginalHeight);
                        await image.SetSourceAsync(thumb);
                    }
                    await DownloadAndSaveHelper.WriteableBitmapToStorageFile(image, videoItem.Id.ToString());
                    videoItem.IsPictureLoaded = true;
                    tcs.SetResult(true);
                });

                await tcs.Task;
                videoDatabase.Update(videoItem);
                return(true);
            }
            catch (Exception ex)
            {
                LogHelper.Log(ex.ToString());
            }
            return(false);
        }