tracker/kinect: get metadata only on first frame

2 files changed, 29 insertions, 21 deletions

diff --git a/tracker-kinect-face/camera_kinect_ir.cpp b/tracker-kinect-face/camera_kinect_ir.cpp
index 15bb7dca..f80eb73f 100644
--- a/tracker-kinect-face/camera_kinect_ir.cpp
+++ b/tracker-kinect-face/camera_kinect_ir.cpp
@@ -198,34 +198,40 @@ bool CameraKinectIr::get_frame_(cv::Mat& frame)
     if (SUCCEEDED(hr))
     {
         INT64 nTime = 0;
-        IFrameDescription* frameDescription = NULL;
-        int nWidth = 0;
-        int nHeight = 0;
-        float diagonalFieldOfView = 0.0f;
         UINT nBufferSize = 0;
         UINT16 *pBuffer = NULL;
 
         hr = iInfraredFrame->get_RelativeTime(&nTime);
 
-        if (SUCCEEDED(hr))
+        if (first_frame)
         {
-            hr = iInfraredFrame->get_FrameDescription(&frameDescription);
-        }
+            IFrameDescription* frameDescription = NULL;
 
-        // TODO: should not request those info for a every frame really
-        if (SUCCEEDED(hr))
-        {
-            hr = frameDescription->get_Width(&nWidth);
-        }
+            if (SUCCEEDED(hr))
+            {
+                hr = iInfraredFrame->get_FrameDescription(&frameDescription);
+            }
 
-        if (SUCCEEDED(hr))
-        {
-            hr = frameDescription->get_Height(&nHeight);
-        }
+            // TODO: should not request those info for a every frame really
+            if (SUCCEEDED(hr))
+            {
+                hr = frameDescription->get_Width(&width);
+            }
 
-        if (SUCCEEDED(hr))
-        {
-            hr = frameDescription->get_DiagonalFieldOfView(&diagonalFieldOfView);
+            if (SUCCEEDED(hr))
+            {
+                hr = frameDescription->get_Height(&height);
+            }
+
+            if (SUCCEEDED(hr))
+            {
+                hr = frameDescription->get_DiagonalFieldOfView(&fov);
+            }
+
+            if (SUCCEEDED(hr))
+                first_frame = false;
+
+            SafeRelease(frameDescription);
         }
         
         if (SUCCEEDED(hr))
@@ -255,8 +261,6 @@ bool CameraKinectIr::get_frame_(cv::Mat& frame)
             //
             success = true;
         }
-
-        SafeRelease(frameDescription);
     }
 
 
diff --git a/tracker-kinect-face/camera_kinect_ir.h b/tracker-kinect-face/camera_kinect_ir.h
index cb525f72..d5b25baa 100644
--- a/tracker-kinect-face/camera_kinect_ir.h
+++ b/tracker-kinect-face/camera_kinect_ir.h
@@ -68,6 +68,10 @@ private:
     video::frame iFrame;
     cv::Mat iMatFrame;
     cv::Mat raw8;
+
+    float fov = 0;
+    int width = 0, height = 0;
+    bool first_frame = true;
 };
 
 }