From af04f4f97b48be9349f576906c4d249f70e72909 Mon Sep 17 00:00:00 2001
From: sdcb <sdflysha@qq.com>
Date: Sun, 16 Jul 2023 15:14:40 +0800
Subject: [PATCH] Fix a finalized-lazy memory leak issue

---
 build/00-common.linq                      |  2 +-
 src/Sdcb.PaddleOCR/PaddleOcrRecognizer.cs | 48 ++++++++++++++---------
 2 files changed, 31 insertions(+), 19 deletions(-)

diff --git a/build/00-common.linq b/build/00-common.linq
index 6741c5c..f5b55f8 100644
--- a/build/00-common.linq
+++ b/build/00-common.linq
@@ -25,7 +25,7 @@ static ProjectVersion[] Projects = new[]
 	new ProjectVersion("Sdcb.Mkldnn", "0.19-preview.1"), // 0.19
 	new ProjectVersion("Sdcb.Paddle2Onnx", "1.0.0-preview.2"), // 1.0.0-rc.2
 	new ProjectVersion("Sdcb.PaddleInference", "2.5.0-preview.3"),
-	new ProjectVersion("Sdcb.PaddleOCR", "2.6.0.6-preview.4"), 
+	new ProjectVersion("Sdcb.PaddleOCR", "2.6.0.6-preview.5"), 
 	new ProjectVersion("Sdcb.PaddleOCR.Models.Online", "2.6.0.6-preview.4"), 
 	new ProjectVersion("Sdcb.PaddleOCR.Models.LocalV3", "2.6.0.6-preview.4"), 
 	new ProjectVersion("Sdcb.PaddleDetection", "2.3.1"), 
diff --git a/src/Sdcb.PaddleOCR/PaddleOcrRecognizer.cs b/src/Sdcb.PaddleOCR/PaddleOcrRecognizer.cs
index 721406a..1908956 100644
--- a/src/Sdcb.PaddleOCR/PaddleOcrRecognizer.cs
+++ b/src/Sdcb.PaddleOCR/PaddleOcrRecognizer.cs
@@ -113,28 +113,40 @@ private PaddleOcrRecognizerResult[] RunMulti(Mat[] srcs)
             return 1.0 * size.Width / size.Height * modelHeight;
         }));
 
-        Mat[] normalizeds = srcs
-            .Select(src =>
-            {
-                using Mat channel3 = src.Channels() switch
+        Mat[] normalizeds = null!;
+        try
+        {
+            normalizeds = srcs
+                .Select(src =>
                 {
-                    4 => src.CvtColor(ColorConversionCodes.RGBA2BGR),
-                    1 => src.CvtColor(ColorConversionCodes.GRAY2RGB),
-                    3 => src.Clone(),
-                    var x => throw new Exception($"Unexpect src channel: {x}, allow: (1/3/4)")
-                };
-                using Mat resized = ResizePadding(channel3, modelHeight, maxWidth);
-                return Normalize(resized);
-            })
-            .ToArray();
+                    using Mat channel3 = src.Channels() switch
+                    {
+                        4 => src.CvtColor(ColorConversionCodes.RGBA2BGR),
+                        1 => src.CvtColor(ColorConversionCodes.GRAY2RGB),
+                        3 => src.Clone(),
+                        var x => throw new Exception($"Unexpect src channel: {x}, allow: (1/3/4)")
+                    };
+                    using Mat resized = ResizePadding(channel3, modelHeight, maxWidth);
+                    return Normalize(resized);
+                })
+                .ToArray();
 
-        using (PaddleTensor input = _p.GetInputTensor(_p.InputNames[0]))
+            using (PaddleTensor input = _p.GetInputTensor(_p.InputNames[0]))
+            {
+                int channel = normalizeds[0].Channels();
+                input.Shape = new[] { normalizeds.Length, channel, modelHeight, maxWidth };
+                float[] data = ExtractMat(normalizeds, channel, modelHeight, maxWidth);
+                input.SetData(data);
+            }
+        }
+        finally
         {
-            int channel = normalizeds[0].Channels();
-            input.Shape = new[] { normalizeds.Length, channel, modelHeight, maxWidth };
-            float[] data = ExtractMat(normalizeds, channel, modelHeight, maxWidth);
-            input.SetData(data);
+            foreach (Mat normalized in normalizeds)
+            {
+                normalized.Dispose();
+            }
         }
+
         if (!_p.Run())
         {
             throw new Exception($"PaddlePredictor(Recognizer) run failed.");