Offload 1080p+ subtitle scaling to RKRGA

Signed-off-by: nyanmisaka <nst799610810@gmail.com>

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -6018,9 +6018,10 @@ namespace MediaBrowser.Controller.MediaEncoding
             {
                 if (hasSubs)
                 {
+                    var subMaxH = 1080;
                     if (hasGraphicalSubs)
                     {
-                        var subPreProcFilters = GetGraphicalSubPreProcessFilters(swpInW, swpInH, subW, subH, reqW, reqH, reqMaxW, reqMaxH);
+                        var subPreProcFilters = GetGraphicalSubPreProcessFilters(swpInW, swpInH, subW, subH, reqW, reqH, reqMaxW, subMaxH);
                         subFilters.Add(subPreProcFilters);
                         subFilters.Add("format=bgra");
                     }
@@ -6030,7 +6031,7 @@ namespace MediaBrowser.Controller.MediaEncoding
                         var subFramerate = hasAssSubs ? Math.Min(framerate ?? 25, 60) : 10;
 
                         // alphasrc=s=1280x720:r=10:start=0,format=bgra,subtitles,hwupload
-                        var alphaSrcFilter = GetAlphaSrcFilter(state, swpInW, swpInH, reqW, reqH, reqMaxW, reqMaxH, subFramerate);
+                        var alphaSrcFilter = GetAlphaSrcFilter(state, swpInW, swpInH, reqW, reqH, reqMaxW, subMaxH, subFramerate);
                         var subTextSubtitlesFilter = GetTextSubtitlesFilter(state, true, true);
                         subFilters.Add(alphaSrcFilter);
                         subFilters.Add("format=bgra");
@@ -6039,6 +6040,13 @@ namespace MediaBrowser.Controller.MediaEncoding
 
                     subFilters.Add("hwupload=derive_device=rkmpp");
 
+                    // offload 1080p+ subtitles swscale upscaling from CPU to RGA
+                    var (overlayW, overlayH) = GetFixedOutputSize(swpInW, swpInH, reqW, reqH, reqMaxW, reqMaxH);
+                    if (overlayW.HasValue && overlayH.HasValue && overlayH.Value > subMaxH)
+                    {
+                        subFilters.Add($"vpp_rkrga=w={overlayW.Value}:h={overlayH.Value}:format=bgra:afbc=1");
+                    }
+
                     // try enabling AFBC to save DDR bandwidth
                     var hwOverlayFilter = "overlay_rkrga=eof_action=pass:repeatlast=0:format=nv12";
                     if (isEncoderSupportAfbc)