Merge pull request #15957 from cudawarped:fix_cudacodec_python

Fix cudacodec python

* Add python bindings to cudacodec.

* Allow args with CV_OUT GpuMat& or CV_OUT cuda::GpuMat& to generate python bindings that allow the argument to be an optional output in the same way as OutputArray.

* Add wrapper flag to indicate that an OutputArray is a GpuMat.

* python: drop CV_GPU, extra checks in test

* Remove "cuda::GpuMat" check rom python parser

modules/python/src2/gen2.py

@@ -349,8 +349,7 @@ class ArgInfo(object):
         self.py_outputarg = False
 
     def isbig(self):
-        return self.tp == "Mat" or self.tp == "vector_Mat" or self.tp == "cuda::GpuMat"\
-               or self.tp == "UMat" or self.tp == "vector_UMat" # or self.tp.startswith("vector")
+        return self.tp in ["Mat", "vector_Mat", "GpuMat", "UMat", "vector_UMat"] # or self.tp.startswith("vector")
 
     def crepr(self):
         return "ArgInfo(\"%s\", %d)" % (self.name, self.outputarg)

modules/python/src2/hdr_parser.py

@@ -913,9 +913,9 @@ class CppHeaderParser(object):
                         else:
                             decls.append(decl)
 
-                            if self._generate_gpumat_decls and "cv.cuda." in decl[0]:
+                            if self._generate_gpumat_decls and "cv.cuda" in decl[0]:
                                 # If function takes as one of arguments Mat or vector<Mat> - we want to create the
-                                # same declaration working with GpuMat (this is important for T-Api access)
+                                # same declaration working with GpuMat
                                 args = decl[3]
                                 has_mat = len(list(filter(lambda x: x[0] in {"Mat", "vector_Mat"}, args))) > 0
                                 if has_mat: