fixes #226 - We're holding locks on images

MediaBrowser.Controller/Drawing/ImageHeader.cs

@@ -1,4 +1,6 @@
-using MediaBrowser.Model.Logging;
+using System.Threading.Tasks;
+using MediaBrowser.Common.IO;
+using MediaBrowser.Model.Logging;
 using System;
 using System.Collections.Generic;
 using System.Drawing;
@@ -39,7 +41,7 @@ namespace MediaBrowser.Controller.Drawing
         /// <param name="logger">The logger.</param>
         /// <returns>The dimensions of the specified image.</returns>
         /// <exception cref="ArgumentException">The image was of an unrecognised format.</exception>
-        public static Size GetDimensions(string path, ILogger logger)
+        public static async Task<Size> GetDimensions(string path, ILogger logger)
         {
             try
             {
@@ -54,11 +56,17 @@ namespace MediaBrowser.Controller.Drawing
             catch
             {
                 logger.Info("Failed to read image header for {0}. Doing it the slow way.", path);
+            }
 
-                using (var fs = File.OpenRead(path))
+            // Buffer to memory stream to avoid image locking file
+            using (var fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, true))
             {
+                using (var memoryStream = new MemoryStream())
+                {
+                    await fs.CopyToAsync(memoryStream).ConfigureAwait(false);
+
                     // Co it the old fashioned way
-                    using (var b = Image.FromStream(fs, true, false))
+                    using (var b = Image.FromStream(memoryStream, true, false))
                     {
                         return b.Size;
                     }

MediaBrowser.Controller/Drawing/ImageManager.cs

@@ -172,21 +172,26 @@ namespace MediaBrowser.Controller.Drawing
 
             try
             {
-                using (var fileStream = File.OpenRead(originalImagePath))
+                using (var fileStream = new FileStream(originalImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, true))
                 {
+                    // Copy to memory stream to avoid Image locking file
+                    using (var memoryStream = new MemoryStream())
+                    {
+                        await fileStream.CopyToAsync(memoryStream).ConfigureAwait(false);
+
                         using (var originalImage = Image.FromStream(fileStream, true, false))
                         {
                             var newWidth = Convert.ToInt32(newSize.Width);
                             var newHeight = Convert.ToInt32(newSize.Height);
 
                             // Graphics.FromImage will throw an exception if the PixelFormat is Indexed, so we need to handle that here
-                        var thumbnail = !ImageExtensions.IsPixelFormatSupportedByGraphicsObject(originalImage.PixelFormat) ? new Bitmap(originalImage, newWidth, newHeight) : new Bitmap(newWidth, newHeight, originalImage.PixelFormat);
+                            using (var thumbnail = !ImageExtensions.IsPixelFormatSupportedByGraphicsObject(originalImage.PixelFormat) ? new Bitmap(originalImage, newWidth, newHeight) : new Bitmap(newWidth, newHeight, originalImage.PixelFormat))
-
+                            {
                                 // Preserve the original resolution
                                 thumbnail.SetResolution(originalImage.HorizontalResolution, originalImage.VerticalResolution);
 
-                        var thumbnailGraph = Graphics.FromImage(thumbnail);
+                                using (var thumbnailGraph = Graphics.FromImage(thumbnail))
-
+                                {
                                     thumbnailGraph.CompositingQuality = CompositingQuality.HighQuality;
                                     thumbnailGraph.SmoothingMode = SmoothingMode.HighQuality;
                                     thumbnailGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
@@ -197,12 +202,12 @@ namespace MediaBrowser.Controller.Drawing
 
                                     var outputFormat = originalImage.RawFormat;
 
-                        using (var memoryStream = new MemoryStream())
+                                    using (var outputMemoryStream = new MemoryStream())
                                     {
                                         // Save to the memory stream
-                            thumbnail.Save(outputFormat, memoryStream, quality.Value);
+                                        thumbnail.Save(outputFormat, outputMemoryStream, quality.Value);
 
-                            var bytes = memoryStream.ToArray();
+                                        var bytes = outputMemoryStream.ToArray();
 
                                         var outputTask = toStream.WriteAsync(bytes, 0, bytes.Length);
 
@@ -211,9 +216,10 @@ namespace MediaBrowser.Controller.Drawing
 
                                         await outputTask.ConfigureAwait(false);
                                     }
+                                }
+                            }
 
-                        thumbnailGraph.Dispose();
+                        }
-                        thumbnail.Dispose();
                     }
                 }
             }
@@ -320,9 +326,7 @@ namespace MediaBrowser.Controller.Drawing
                     // Cache file doesn't exist no biggie
                 }
 
-                _logger.Debug("Getting image size for {0}", imagePath);
+                var size = await ImageHeader.GetDimensions(imagePath, _logger).ConfigureAwait(false);
-
-                var size = ImageHeader.GetDimensions(imagePath, _logger);
 
                 // Update the file system cache
                 File.WriteAllText(fullCachePath, size.Width.ToString(UsCulture) + @"|" + size.Height.ToString(UsCulture));
@@ -468,9 +472,14 @@ namespace MediaBrowser.Controller.Drawing
             
             try
             {
-                using (var fileStream = File.OpenRead(originalImagePath))
+                using (var fileStream = new FileStream(originalImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, true))
                 {
-                    using (var originalImage = (Bitmap)Image.FromStream(fileStream, true, false))
+                    // Copy to memory stream to avoid Image locking file
+                    using (var memoryStream = new MemoryStream())
+                    {
+                        await fileStream.CopyToAsync(memoryStream).ConfigureAwait(false);
+
+                        using (var originalImage = (Bitmap)Image.FromStream(memoryStream, true, false))
                         {
                             var outputFormat = originalImage.RawFormat;
 
@@ -484,6 +493,7 @@ namespace MediaBrowser.Controller.Drawing
                         }
                     }
                 }
+            }
             catch (Exception ex)
             {
                 // We have to have a catch-all here because some of the .net image methods throw a plain old Exception
@@ -547,9 +557,14 @@ namespace MediaBrowser.Controller.Drawing
 
             try
             {
-                using (var fileStream = File.OpenRead(originalImagePath))
+                using (var fileStream = new FileStream(originalImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, true))
                 {
-                    using (var originalImage = Image.FromStream(fileStream, true, false))
+                    // Copy to memory stream to avoid Image locking file
+                    using (var memoryStream = new MemoryStream())
+                    {
+                        await fileStream.CopyToAsync(memoryStream).ConfigureAwait(false);
+
+                        using (var originalImage = Image.FromStream(memoryStream, true, false))
                         {
                             //Pass the image through registered enhancers
                             using (var newImage = await ExecuteImageEnhancers(supportedEnhancers, originalImage, item, imageType, imageIndex).ConfigureAwait(false))
@@ -563,6 +578,7 @@ namespace MediaBrowser.Controller.Drawing
                         }
                     }
                 }
+            }
             finally
             {
                 semaphore.Release();
@@ -650,8 +666,6 @@ namespace MediaBrowser.Controller.Drawing
             {
                 var typeName = enhancer.GetType().Name;
 
-                _logger.Debug("Running {0} for {1}", typeName, item.Path ?? item.Name ?? "--Unknown--");
-
                 try
                 {
                     result = await enhancer.EnhanceImageAsync(item, result, imageType, imageIndex).ConfigureAwait(false);