From c391c7c9be8f53c127fb6ba5c5da210c586e4cf2 Mon Sep 17 00:00:00 2001
From: Austin Van Blanton <imaus10@gmail.com>
Date: Thu, 8 Aug 2013 11:25:56 -0400
Subject: [PATCH] Add DropFrames transform to skip frames in a video

---
 openbr/plugins/frames.cpp | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+), 0 deletions(-)

diff --git a/openbr/plugins/frames.cpp b/openbr/plugins/frames.cpp
index 74aa978..ea06dcf 100644
--- a/openbr/plugins/frames.cpp
+++ b/openbr/plugins/frames.cpp
@@ -48,6 +48,47 @@ private:
 
 BR_REGISTER(Transform, AggregateFrames)
 
+/*!
+ * \ingroup transforms
+ * \brief Only use one frame every n frames.
+ * \author Austin Blanton \cite imaus10
+ *
+ * For a video with m frames, DropFrames will pass on m/n frames.
+ */
+class DropFrames : public TimeVaryingTransform
+{
+    Q_OBJECT
+    Q_PROPERTY(int n READ get_n WRITE set_n RESET reset_n STORED false)
+    BR_PROPERTY(int, n, 1)
+
+public:
+    DropFrames() : TimeVaryingTransform(false) {}
+
+private:
+    void train(const TemplateList &data)
+    {
+        (void) data;
+    }
+
+    void projectUpdate(const Template &src, Template &dst)
+    {
+        if (src.file.get<int>("FrameNumber") % n != 0) return;
+        dst = src;
+    }
+
+    void store(QDataStream &stream) const
+    {
+        (void) stream;
+    }
+
+    void load(QDataStream &stream)
+    {
+        (void) stream;
+    }
+};
+
+BR_REGISTER(Transform, DropFrames)
+
 } // namespace br
 
 #include "frames.moc"
--
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