build: fix warnings

modules/core/include/opencv2/core/hal/intrin_cpp.hpp

@@ -1047,7 +1047,7 @@ template<typename _Tp, int n> inline bool v_check_any(const v_reg<_Tp, n>& a)
 Return value will be built by combining values _a_ and _b_ using the following scheme:
     result[i] = mask[i] ? a[i] : b[i];
 
-@Note: _mask_ element values are restricted to these values:
+@note: _mask_ element values are restricted to these values:
 - 0: select element from _b_
 - 0xff/0xffff/etc: select element from _a_
 (fully compatible with bitwise-based operator)

modules/videoio/include/opencv2/videoio/container_avi.private.hpp

@@ -106,7 +106,8 @@ protected:
     bool parseMovi(frame_list& in_frame_list)
     {
         //not implemented
-        in_frame_list.empty();
+        CV_UNUSED(in_frame_list);
+        // FIXIT: in_frame_list.empty();
         return true;
     }
     bool parseStrl(char stream_id, Codecs codec_);

modules/videoio/src/cap_gstreamer.cpp

@@ -158,7 +158,7 @@ inline static bool is_gst_element_exists(const std::string & name)
 
 //==================================================================================================
 
-class GStreamerCapture : public IVideoCapture
+class GStreamerCapture CV_FINAL : public IVideoCapture
 {
 private:
     GstElement*   pipeline;
@@ -184,12 +184,12 @@ private:
 public:
     GStreamerCapture();
     ~GStreamerCapture();
-    virtual bool grabFrame();
-    virtual bool retrieveFrame(int /*unused*/, OutputArray dst);
-    virtual double getProperty(int propId) const;
-    virtual bool setProperty(int propId, double value);
-    virtual bool isOpened() const;
-    virtual int getCaptureDomain(); // Return the type of the capture object: CAP_VFW, etc...
+    virtual bool grabFrame() CV_OVERRIDE;
+    virtual bool retrieveFrame(int /*unused*/, OutputArray dst) CV_OVERRIDE;
+    virtual double getProperty(int propId) const CV_OVERRIDE;
+    virtual bool setProperty(int propId, double value) CV_OVERRIDE;
+    virtual bool isOpened() const CV_OVERRIDE;
+    virtual int getCaptureDomain() CV_OVERRIDE; // Return the type of the capture object: CAP_VFW, etc...
     bool open(int id);
     bool open(const String &filename_);
     static void newPad(GstElement * /*elem*/, GstPad     *pad, gpointer    data);
@@ -630,7 +630,7 @@ bool GStreamerCapture::open(const String &filename_)
     const gchar * filename = filename_.c_str();
 
     bool file = false;
-    bool stream = false;
+    //bool stream = false;
     bool manualpipeline = false;
     char *uri = NULL;
     GstElement*   uridecodebin = NULL;
@@ -655,7 +655,7 @@ bool GStreamerCapture::open(const String &filename_)
 #else
         uri = realpath(filename, NULL);
 #endif
-        stream = false;
+        //stream = false;
         if(uri)
         {
             uri = g_filename_to_uri(uri, NULL, NULL);
@@ -680,13 +680,13 @@ bool GStreamerCapture::open(const String &filename_)
                 fprintf(stderr, "GStreamer: Error opening bin: %s\n", err->message);
                 return false;
             }
-            stream = true;
+            //stream = true;
             manualpipeline = true;
         }
     }
     else
     {
-        stream = true;
+        //stream = true;
         uri = g_strdup(filename);
     }
 

modules/videoio/test/test_video_io.cpp

@@ -83,6 +83,7 @@ struct VideoCaptureAPI
         case CAP_ARAVIS: return "CAP_ARAVIS";
         case CAP_OPENCV_MJPEG: return "CAP_OPENCV_MJPEG";
         case CAP_INTEL_MFX: return "CAP_INTEL_MFX";
+        case CAP_XINE: return "CAP_XINE";
         }
         return "unknown";
     }

samples/dnn/object_detection.cpp

@@ -214,7 +214,7 @@ void postprocess(Mat& frame, const std::vector<Mat>& outs, Net& net)
             }
         }
         std::vector<int> indices;
-        NMSBoxes(boxes, confidences, confThreshold, 0.4, indices);
+        NMSBoxes(boxes, confidences, confThreshold, 0.4f, indices);
         for (size_t i = 0; i < indices.size(); ++i)
         {
             int idx = indices[i];