Fix rotation detection for HDR videos (#50854)

Fixes https://github.com/rails/rails/issues/50853

The video analyzer was relying on the positional reference of the Display
Matrix side_data to fetch the rotation value. However, the side_data is
not guaranteed to be in the same position. For instance, HDR videos shot
on iOS have "DOVI configuration record" side_data in the first position,
followed by the "Display Matrix" side data containing the rotation value.

This fix removes the positional reference and explicitely searches for
the "Display Matrix" side_data to retrieve the rotation angle.

activestorage/lib/active_storage/analyzer/video_analyzer.rb

@@ -55,11 +55,15 @@ module ActiveStorage
       def angle
         if tags["rotate"]
           Integer(tags["rotate"])
-        elsif side_data && side_data[0] && side_data[0]["rotation"]
+        elsif display_matrix && display_matrix["rotation"]
-          Integer(side_data[0]["rotation"])
+          Integer(display_matrix["rotation"])
         end
       end
 
+      def display_matrix
+        side_data.detect { |data| data["side_data_type"] == "Display Matrix" }
+      end
+
       def display_aspect_ratio
         if descriptor = video_stream["display_aspect_ratio"]
           if terms = descriptor.split(":", 2)

activestorage/test/analyzer/video_analyzer_test.rb

@@ -29,6 +29,15 @@ class ActiveStorage::Analyzer::VideoAnalyzerTest < ActiveSupport::TestCase
     assert_includes [90, -90], metadata[:angle]
   end
 
+  test "analyzing a rotated HDR video" do
+    blob = create_file_blob(filename: "rotated_hdr_video.mov", content_type: "video/quicktime")
+    metadata = extract_metadata_from(blob)
+
+    assert_equal 1080.0, metadata[:width]
+    assert_equal 1920.0, metadata[:height]
+    assert_equal(-90, metadata[:angle])
+  end
+
   test "analyzing a video with rectangular samples" do
     blob = create_file_blob(filename: "video_with_rectangular_samples.mp4", content_type: "video/mp4")
     metadata = extract_metadata_from(blob)