C# MediaItem类代码示例

    public static HtmlString RenderParallaxMediaAttributes(this Item item)
    {
      var targetItem = item.TargetItem(Templates.HasParallaxBackground.Fields.BackgroundMedia);
      var targetMedia = new MediaItem(targetItem);
      var attributeDictionary = new Dictionary<string, string>();
      var mimeType = targetMedia.MimeType.Split('/');
      var mediaType = mimeType[0];
      var mediaFormat = mimeType[1];

      attributeDictionary["type"] = mediaType;
      if (mediaType == "video")
        attributeDictionary["format"] = mediaFormat;
        
      attributeDictionary[mediaType == "video" ? $"url-{mediaFormat}" : "url"] = item.MediaUrl(Templates.HasParallaxBackground.Fields.BackgroundMedia);
      var checkboxField = (Sitecore.Data.Fields.CheckboxField)item.Fields[Templates.HasParallaxBackground.Fields.IsParallaxEnabled];
      attributeDictionary["attachment"] = checkboxField.Checked ? "parallax" : "static";
      if (checkboxField.Checked)
      {
        attributeDictionary["parallaxspeed"] = item.Fields[Templates.HasParallaxBackground.Fields.ParallaxSpeed].Value;
      }

      
      var attributes = attributeDictionary.Select(x => $"data-multibackground-layer-0-{x.Key}='{x.Value}'").ToList();
      attributes.Add("data-multibackground");
      return new HtmlString(string.Join(" ", attributes));
    }

    public override bool Process(MediaItem mediaItem, out ContentDirectoryMessaging.MediaItemChangeType changeType)
    {
      changeType = ContentDirectoryMessaging.MediaItemChangeType.None;

      var rl = mediaItem.GetResourceLocator();
      using (var ra = rl.CreateAccessor())
      {
        var rad = ra as IResourceDeletor;
        if (rad == null)
          return false;

        // First try to delete the file from storage.
        if (rad.Delete())
        {
          changeType = ContentDirectoryMessaging.MediaItemChangeType.Deleted;

          // If the MediaItem was loaded from ML, remove it there as well.
          if (IsManagedByMediaLibrary(mediaItem))
          {
            IContentDirectory cd = ServiceRegistration.Get<IServerConnectionManager>().ContentDirectory;
            if (cd == null)
              return true;

            cd.DeleteMediaItemOrPath(rl.NativeSystemId, rl.NativeResourcePath, true);
            return true;
          }
        }
      }
      return false;
    }

 private static string ConfigureProfile(DlnaForthField dlnaField, MediaItem item, string mediaType)
 {
     //TODO: much better type resolution
     switch(mediaType)
     {
         case MediaLibraryHelper.MIMETYPE_AUDIO:
             dlnaField.ProfileParameter.ProfileName = DlnaProfiles.Mp3;
             dlnaField.FlagsParameter.StreamingMode = true;
             dlnaField.FlagsParameter.InteractiveMode = false;
             dlnaField.FlagsParameter.BackgroundMode = true;
             break;
         case MediaLibraryHelper.MIMETYPE_VIDEO:
             dlnaField.ProfileParameter.ProfileName = DlnaProfiles.MpegPsPal;
             dlnaField.FlagsParameter.StreamingMode = true;
             dlnaField.FlagsParameter.InteractiveMode = false;
             dlnaField.FlagsParameter.BackgroundMode = true;
             break;
         case MediaLibraryHelper.MIMETYPE_IMAGE:
             dlnaField.ProfileParameter.ProfileName = DlnaProfiles.JpegLarge;
             dlnaField.FlagsParameter.StreamingMode = false;
             dlnaField.FlagsParameter.InteractiveMode = true;
             dlnaField.FlagsParameter.BackgroundMode = true;
             break;
     }
     return null;
 }

        protected override String getKey(MediaItem item)
        {
            String key = "";

            if (item.Metadata != null)
            {
                if (item.Metadata.IsImported)
                {
                    key += '0';
                }

                if (!item.Metadata.SupportsXMPMetadata)
                {
                    key += '1';
                }
            }

            if (item.HasTags)
            {
                key += '2';
            }

            if (item.HasGeoTag)
            {
                key += '3';
            }

            if (item.IsReadOnly)
            {
                key += '4';
            }

            return (key);
        }

 /// <summary>
 /// Gets a media URL.
 /// </summary>
 /// <param name="item">The media item.</param>
 /// <param name="options">The query string.</param>
 /// <returns>
 /// The media URL.
 /// </returns>
 public override string GetMediaUrl(MediaItem item, MediaUrlOptions options)
 {
     Assert.ArgumentNotNull(item, "item");
     Assert.ArgumentNotNull(options, "options");
     var flag = options.Thumbnail || HasMediaContent(item);
     if (!flag && item.InnerItem["path"].Length > 0)
     {
         if (!options.LowercaseUrls)
             return item.InnerItem["path"];
         return item.InnerItem["path"].ToLowerInvariant();
     }
     if (options.UseDefaultIcon && !flag)
     {
         return !options.LowercaseUrls ? Themes.MapTheme(Settings.DefaultIcon) : Themes.MapTheme(Settings.DefaultIcon).ToLowerInvariant();
     }
     Assert.IsTrue(Config.MediaPrefixes[0].Length > 0, "media prefixes are not configured properly.");
     var str1 = MediaLinkPrefix;
     if (options.AbsolutePath)
         str1 = options.VirtualFolder + str1;
     else if (str1.StartsWith("/", StringComparison.InvariantCulture))
         str1 = StringUtil.Mid(str1, 1);
     var part2 = MainUtil.EncodePath(str1, '/');
     if (options.AlwaysIncludeServerUrl)
         part2 = FileUtil.MakePath(string.IsNullOrEmpty(options.MediaLinkServerUrl) ? WebUtil.GetServerUrl() : options.MediaLinkServerUrl, part2, '/');
     var str2 = StringUtil.EnsurePrefix('.', StringUtil.GetString(options.RequestExtension, item.Extension, "ashx"));
     var str3 = options.ToString();
     if (str3.Length > 0)
         str2 = str2 + "?" + str3;
     const string str4 = "/sitecore/media library/";
     var path = item.InnerItem.Paths.Path;
     var str5 = MainUtil.EncodePath(!options.UseItemPath || !path.StartsWith(str4, StringComparison.OrdinalIgnoreCase) ? item.ID.ToShortID().ToString() : StringUtil.Mid(path, str4.Length), '/');
     var str6 = part2 + str5 + (options.IncludeExtension ? str2 : string.Empty);
     return !options.LowercaseUrls ? str6 : str6.ToLowerInvariant();
 }

 public IPlayer GetPlayer(MediaItem mediaItem)
 {
   string mimeType;
   string title;
   if (!mediaItem.GetPlayData(out mimeType, out title))
     return null;
   IResourceLocator locator = mediaItem.GetResourceLocator();
   if (!ImagePlayer.CanPlay(locator, mimeType))
     return null;
   ImagePlayer player = new ImagePlayer();
   try
   {
     if (!player.NextItem(mediaItem, StartTime.AtOnce))
     {
       player.Dispose();
       return null;
     }
   }
   catch (Exception e)
   {
     ServiceRegistration.Get<ILogger>().Warn("ImagePlayerBuilder: Error playing media item '{0}'", e, locator);
     player.Dispose();
     return null;
   }
   return player;
 }

    public override int Compare(MediaItem item1, MediaItem item2)
    {
      MediaItemAspect seriesAspectX;
      MediaItemAspect seriesAspectY;
      if (item1.Aspects.TryGetValue(SeriesAspect.ASPECT_ID, out seriesAspectX) && item2.Aspects.TryGetValue(SeriesAspect.ASPECT_ID, out seriesAspectY))
      {
        int seasonX = (int) (seriesAspectX.GetAttributeValue(SeriesAspect.ATTR_SEASON) ?? 0);
        int seasonY = (int) (seriesAspectY.GetAttributeValue(SeriesAspect.ATTR_SEASON) ?? 0);
        int seasonRes = seasonX.CompareTo(seasonY);
        if (seasonRes != 0)
          return seasonRes;

        IEnumerable<int> episodesX = seriesAspectX.GetCollectionAttribute<int>(SeriesAspect.ATTR_EPISODE);
        IEnumerable<int> episodesY = seriesAspectY.GetCollectionAttribute<int>(SeriesAspect.ATTR_EPISODE);
        
        int episodeX = 0;
        int episodeY = 0;
        if (episodesX != null)
          episodeX = episodesX.FirstOrDefault();
        if (episodesY != null)
          episodeY = episodesY.FirstOrDefault();

        int episodeRes = episodeX.CompareTo(episodeY);
        if (episodeRes != 0)
          return episodeRes;
      }
      return base.Compare(item1, item2);
    }

        public List<WpPost> GetPosts(WpImportOptions options)
        {
            Item mediaInnerItem = _db.GetItem(_mediaItemId);
            if (mediaInnerItem == null)
            {
                Logger.Error(String.Format("Media item for import could not be found (id: {0}, db: {1})", _mediaItemId, _db.Name));
                return new List<WpPost>(0);
            }
            MediaItem mediaItem = new MediaItem(mediaInnerItem);

            XmlDocument xmdDoc = new XmlDocument();
            var mediaStream = MediaManager.GetMedia(mediaItem).GetStream();
            if (mediaStream == null || mediaStream.MimeType != "text/xml")
            {
                Logger.Error(String.Format("MediaStream for imported item is null or uploaded file has is incorrect format (id: {0}, db: {1})", _mediaItemId, _db.Name));
                return new List<WpPost>(0);
            }

            xmdDoc.Load(mediaStream.Stream);
            using (var nodeReader = new XmlNodeReader(xmdDoc))
            {
                nodeReader.MoveToContent();
                var xDocument = XDocument.Load(nodeReader);

                var posts = (from item in xDocument.Descendants("item")
                             select new WpPost(item, options)).ToList();
                return posts;
            }
        }

        public static bool ConvertWave2Wma(string waveFilePath, string artist, string title, string genre, int year, out string exceptionMessage)
        {
            //encode
            MediaItem albumItem;
            try
            {
                string jobFilePath = waveFilePath.Replace(".wav", "-job.xej");

                StreamReader reader = new StreamReader(Assembly.GetExecutingAssembly().GetManifestResourceStream("AudioConverter.ExpressionEncoderJob.xej"));
                File.WriteAllText(jobFilePath, reader.ReadToEnd());
                reader.Close();

                Job job = Job.LoadJob(jobFilePath);

                string presetFilePath = waveFilePath.Replace(".wav", "-presets.xml");
                WritePresetFile(presetFilePath, artist, title, genre, year);
                job.MediaItems.Clear();
                albumItem = new MediaItem(waveFilePath);
                job.MediaItems.Add(albumItem);
                job.ApplyPreset(Preset.FromFile(presetFilePath));
                job.Encode();
                exceptionMessage = null;
                return true;
            }
            catch (Exception ex)
            {
                exceptionMessage = ex.Message;
                return false;
            }
        }

        public static void EncodeVideo(FileInfo inputFile, FileInfo outputFile)
        {
            DirectoryInfo outDir = outputFile.Directory;
            if (!outDir.Exists)
            {
                outDir.Create();
            }
            MediaItem mediaItem = new MediaItem(inputFile.FullName);
            int bitrate = GetBitrate(mediaItem);

            using (Job job = new Job())
            {
                job.OutputDirectory = outDir.FullName;
                job.CreateSubfolder = false;
                job.MediaItems.Add(mediaItem);

                SetProfile(mediaItem);

                // We can also use some of the presets. In that case comment the SetProfile line above for something like the one below:

                //    //H264VimeoSD preset settings: Output Format: MP4. Container: MP4. Video Codec: H.264 - Main.
                //    //Video size: 640, 480. Video Bitrate: 2500 Kbps. Video Encoding: CBR SinglePass.
                //    //Audio Codec: AAC. Audio Channels: Stereo. Audio Bitrate: 128 Kbps. Audio Encoding: CBR Single Pass
                //    job.ApplyPreset(Presets.H264VimeoSD);

                job.Encode();
            }
            if (!outputFile.FullName.Equals(mediaItem.ActualOutputFileFullPath, StringComparison.InvariantCultureIgnoreCase))
            {
                throw new Exception(String.Format("The output file specified: '{0}' does not match the actual output file '{1}'", outputFile.FullName, mediaItem.ActualOutputFileFullPath));
            }
        }

        /// <summary>
        ///     Gets the media URL.
        /// </summary>
        /// <param name="item">The item.</param>
        /// <param name="mediaUrlOptions">The media URL options.</param>
        /// <returns></returns>
        public override string GetMediaUrl(MediaItem item, MediaUrlOptions mediaUrlOptions)
        {
            Assert.ArgumentNotNull(item, "item");
            Assert.ArgumentNotNull(mediaUrlOptions, "mediaUrlOptions");

            //Return the standard image if any of the following conditions are met
            if (!IsImage(item) || Context.Database == null || Context.Site.Name == "shell" || !Context.PageMode.IsNormal || !((Item)item).HasChildren)
                return base.GetMediaUrl(item, mediaUrlOptions);

            double pixelDensity = GetCookiePixelDensity();
            if (pixelDensity <= 1)
                return base.GetMediaUrl(item, mediaUrlOptions);

            //Get the first child of the media item (It should be the retina version of the image)
            Item retinaItem = ((Item)item).Children.FirstOrDefault();
            //Return the standard image if width and height are not set on the retina media items
            if (retinaItem == null || String.IsNullOrEmpty(retinaItem["Width"]) || String.IsNullOrEmpty(retinaItem["Height"]))
                return base.GetMediaUrl(item, mediaUrlOptions);
            int retinaWidth = System.Convert.ToInt32(retinaItem["Width"]);
            int retinaHeight = System.Convert.ToInt32(retinaItem["Height"]);
            if (mediaUrlOptions.Width > 0 && mediaUrlOptions.Height > 0
                && retinaWidth >= (mediaUrlOptions.Width * pixelDensity) && retinaHeight >= (mediaUrlOptions.Height * pixelDensity))
            {
                mediaUrlOptions.Width = System.Convert.ToInt32(mediaUrlOptions.Width * pixelDensity);
                mediaUrlOptions.Height = System.Convert.ToInt32(mediaUrlOptions.Height * pixelDensity);
                //Return the retina version with width and height parameters adjusted accordingly
                return base.GetMediaUrl(retinaItem, mediaUrlOptions);
            }
            //Return the retina version
            return base.GetMediaUrl(retinaItem, mediaUrlOptions);
        }

        /// <summary>
        /// We require the command line parameters for the web browser host
        /// Util should be an implementation of IBrowserSiteUtil
        /// </summary>
        /// <param name="mediaItem"></param>
        public void Prepare(MediaItem mediaItem)
        {
            bool useIE = false;

            string siteName;
            SiteUtilBase util;
            if (!MediaItemAspect.TryGetAttribute(mediaItem.Aspects, OnlineVideosAspect.ATTR_SITEUTIL, out siteName) || !OnlineVideoSettings.Instance.SiteUtilsList.TryGetValue(siteName, out util))
            {
                throw new ArgumentException("Could not determine used site util, can't start playback!");
            }

            var browserConfig = util as IBrowserSiteUtil;
            if (browserConfig != null)
            {
                _automationType = browserConfig.ConnectorEntityTypeName;
                _username = browserConfig.UserName;
                _password = browserConfig.Password;
            }
            var emulationSite = util as IBrowserVersionEmulation;
            if (emulationSite != null)
            {
                _emulationLevel = emulationSite.EmulatedVersion;
                useIE = _emulationLevel > 10000;
            }

            _lastError = string.Empty;

            _callback.OnBrowserClosing += _callback_OnBrowserHostClosing;
            _callback.OnBrowserKeyPress += _callback_OnBrowserKeyPress;

            var processName = useIE ? HOST_PROCESS_NAME_IE : HOST_PROCESS_NAME;
            _processPath = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), processName + ".exe");

            GetRunningProcess(processName);
        }

        private static File GetFromXml(XmlNode node)
        {
            var mediaId = GetAttribute(node, "mediaid");
              var src = GetAttribute(node, "src");
              var file = new File
              {
            MediaId = mediaId,
            Source = src
              };
              if (string.IsNullOrEmpty(file.MediaId))
              {
            return file;
              }
              var mediaItemFromMediaId = DatabaseRepository.GetActiveDatabase().GetItem(file.MediaId);

              if (mediaItemFromMediaId == null)
              {
            return file;
              }

              var mediaItem = new MediaItem(mediaItemFromMediaId);
              file.Title = string.IsNullOrEmpty(mediaItem.Title)
            ? mediaItem.DisplayName
            : mediaItem.Title;
              file.Extension = mediaItem.Extension;
              file.FileSize = mediaItem.Size;
              return file;
        }

 public static bool IsValidVideo(MediaItem mediaItem)
 {
   if (mediaItem == null)
     return false;
   string mimeType;
   return MediaItemAspect.TryGetAttribute(mediaItem.Aspects, MediaAspect.ATTR_MIME_TYPE, out mimeType) && mimeType.StartsWith("video/");
 }

    /// <summary>
    /// Constructs a <see cref="BinaryTextureImageSource"/> for thumbnails of the given size from MediaItems.
    /// </summary>
    /// <param name="mediaItem">MediaItem to create thumbnail for.</param>
    /// <param name="thumbnailSize">Requested thumbnail size.</param>
    public static BinaryTextureImageSource CreateThumbnailImageSource(MediaItem mediaItem, int thumbnailSize)
    {
      Guid id = mediaItem.MediaItemId;
      // Local media items don't have an item id
      string key = (id == Guid.Empty ? Guid.NewGuid() : id).ToString();
      byte[] textureData = null;

      // Each resolution is cached separately. If we read cache only and our favourite resolution is not yet in cache,
      // we try to find any other existing.
      if (thumbnailSize <= 96)
      {
        if (mediaItem.Aspects.ContainsKey(ThumbnailSmallAspect.ASPECT_ID))
          textureData = (byte[]) mediaItem.Aspects[ThumbnailSmallAspect.ASPECT_ID].GetAttributeValue(ThumbnailSmallAspect.ATTR_THUMBNAIL);

        if (textureData == null && mediaItem.Aspects.ContainsKey(ThumbnailLargeAspect.ASPECT_ID))
          textureData = (byte[]) mediaItem.Aspects[ThumbnailLargeAspect.ASPECT_ID].GetAttributeValue(ThumbnailLargeAspect.ATTR_THUMBNAIL);
      }
      else
      {
        if (mediaItem.Aspects.ContainsKey(ThumbnailLargeAspect.ASPECT_ID))
          textureData = (byte[]) mediaItem.Aspects[ThumbnailLargeAspect.ASPECT_ID].GetAttributeValue(ThumbnailLargeAspect.ATTR_THUMBNAIL);
        
        if (textureData == null && mediaItem.Aspects.ContainsKey(ThumbnailSmallAspect.ASPECT_ID))
          textureData = (byte[]) mediaItem.Aspects[ThumbnailSmallAspect.ASPECT_ID].GetAttributeValue(ThumbnailSmallAspect.ATTR_THUMBNAIL);
      }
      ImageRotation miRotation;
      bool flipX;
      bool flipY;
      ImageAspect.GetOrientationMetadata(mediaItem, out miRotation, out flipX, out flipY);
      RightAngledRotation rotation = RotationTranslator.TranslateToRightAngledRotation(miRotation);
      return new BinaryTextureImageSource(textureData, rotation, key);
    }