Merge pull request #18493 from TolyaTalamanov:at/wrap-streaming

[G-API Wrap streaming

* Wrap streaming

* Fix build

* Add comments

* Remove comment

* Fix comments to review

* Add test for python pull overload

modules/gapi/include/opencv2/gapi/gcomputation.hpp

@@ -436,7 +436,7 @@ public:
      *
      * @sa @ref gapi_compile_args
      */
-    GStreamingCompiled compileStreaming(GMetaArgs &&in_metas, GCompileArgs &&args = {});
+    GAPI_WRAP GStreamingCompiled compileStreaming(GMetaArgs &&in_metas, GCompileArgs &&args = {});
 
     /**
      * @brief Compile the computation for streaming mode.
@@ -457,7 +457,7 @@ public:
      *
      * @sa @ref gapi_compile_args
      */
-    GStreamingCompiled compileStreaming(GCompileArgs &&args = {});
+    GAPI_WRAP GStreamingCompiled compileStreaming(GCompileArgs &&args = {});
 
     // 2. Direct metadata version
     /**

modules/gapi/include/opencv2/gapi/gproto.hpp

@@ -135,7 +135,7 @@ GRunArg value_of(const GOrigin &origin);
 // Transform run-time computation arguments into a collection of metadata
 // extracted from that arguments
 GMetaArg  GAPI_EXPORTS descr_of(const GRunArg  &arg );
-GMetaArgs GAPI_EXPORTS descr_of(const GRunArgs &args);
+GMetaArgs GAPI_EXPORTS_W descr_of(const GRunArgs &args);
 
 // Transform run-time operation result argument into metadata extracted from that argument
 // Used to compare the metadata, which generated at compile time with the metadata result operation in run time

modules/gapi/include/opencv2/gapi/gstreaming.hpp

@@ -49,11 +49,11 @@ namespace cv {
  *
  * @sa GCompiled
  */
-class GAPI_EXPORTS GStreamingCompiled
+class GAPI_EXPORTS_W_SIMPLE GStreamingCompiled
 {
 public:
     class GAPI_EXPORTS Priv;
-    GStreamingCompiled();
+    GAPI_WRAP GStreamingCompiled();
 
     // FIXME: More overloads?
     /**
@@ -96,7 +96,7 @@ public:
      * @param ins vector of inputs to process.
      * @sa gin
      */
-    void setSource(GRunArgs &&ins);
+    GAPI_WRAP void setSource(GRunArgs &&ins);
 
     /**
      * @brief Specify an input video stream for a single-input
@@ -109,7 +109,7 @@ public:
      * @param s a shared pointer to IStreamSource representing the
      * input video stream.
      */
-    void setSource(const gapi::wip::IStreamSource::Ptr& s);
+    GAPI_WRAP void setSource(const gapi::wip::IStreamSource::Ptr& s);
 
     /**
      * @brief Start the pipeline execution.
@@ -126,7 +126,7 @@ public:
      * start()/stop()/setSource() may be called on the same object in
      * multiple threads in your application.
      */
-    void start();
+    GAPI_WRAP void start();
 
     /**
      * @brief Get the next processed frame from the pipeline.
@@ -150,6 +150,9 @@ public:
      */
     bool pull(cv::GRunArgsP &&outs);
 
+    // NB: Used from python
+    GAPI_WRAP std::tuple<bool, cv::GRunArgs> pull();
+
     /**
      * @brief Try to get the next processed frame from the pipeline.
      *
@@ -172,7 +175,7 @@ public:
      *
      * Throws if the pipeline is not running.
      */
-    void stop();
+    GAPI_WRAP void stop();
 
     /**
      * @brief Test if the pipeline is running.
@@ -184,7 +187,7 @@ public:
      *
      * @return true if the current stream is not over yet.
      */
-    bool running() const;
+    GAPI_WRAP bool running() const;
 
     /// @private
     Priv& priv();

modules/gapi/include/opencv2/gapi/imgproc.hpp

@@ -497,7 +497,7 @@ The median filter uses cv::BORDER_REPLICATE internally to cope with border pixel
 @param ksize aperture linear size; it must be odd and greater than 1, for example: 3, 5, 7 ...
 @sa  boxFilter, gaussianBlur
  */
-GAPI_EXPORTS GMat medianBlur(const GMat& src, int ksize);
+GAPI_EXPORTS_W GMat medianBlur(const GMat& src, int ksize);
 
 /** @brief Erodes an image by using a specific structuring element.
 

modules/gapi/include/opencv2/gapi/streaming/cap.hpp

@@ -103,6 +103,12 @@ protected:
     }
 };
 
+// NB: Overload for using from python
+GAPI_EXPORTS_W cv::Ptr<IStreamSource> inline make_capture_src(const std::string& path)
+{
+    return make_src<GCaptureSource>(path);
+}
+
 } // namespace wip
 } // namespace gapi
 } // namespace cv