From 9e181699598b4741ebe7ab63262bd7328ccdffbc Mon Sep 17 00:00:00 2001
From: Alexander Smorkalov <2536374+asmorkalov@users.noreply.github.com>
Date: Wed, 4 Jun 2025 16:30:50 +0300
Subject: [PATCH] Merge pull request #27355 from
 asmorkalov:as/gapi_control_msmf

Check MS Media Foundation availability in G-API too #27355

Tries to address https://github.com/opencv/opencv-python/issues/771

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [ ] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [ ] The feature is well documented and sample code can be built with the project CMake
---
 modules/gapi/CMakeLists.txt                              | 9 +++++++++
 .../onevpl/demux/async_mfp_demux_data_provider.cpp       | 8 +++++---
 .../onevpl/demux/async_mfp_demux_data_provider.hpp       | 6 +++---
 3 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/modules/gapi/CMakeLists.txt b/modules/gapi/CMakeLists.txt
index f18290ca7d..29b20cabf6 100644
--- a/modules/gapi/CMakeLists.txt
+++ b/modules/gapi/CMakeLists.txt
@@ -380,6 +380,15 @@ if(WIN32)
   ocv_target_link_libraries(${the_module} PRIVATE wsock32 ws2_32)
 endif()
 
+ocv_option(OPENCV_GAPI_MSMF "Build G-API with MS Media Foundation support" HAVE_MSMF)
+if(HAVE_MSMF AND OPENCV_GAPI_MSMF)
+  if(TARGET opencv_test_gapi)
+    ocv_target_compile_definitions(opencv_test_gapi PRIVATE -DHAVE_GAPI_MSMF)
+  endif()
+  ocv_target_compile_definitions(${the_module} PRIVATE -DHAVE_GAPI_MSMF)
+  ocv_target_link_libraries(${the_module} PRIVATE ocv.3rdparty.msmf)
+endif()
+
 if(HAVE_DIRECTML)
   ocv_target_compile_definitions(${the_module} PRIVATE HAVE_DIRECTML=1)
 endif()
diff --git a/modules/gapi/src/streaming/onevpl/demux/async_mfp_demux_data_provider.cpp b/modules/gapi/src/streaming/onevpl/demux/async_mfp_demux_data_provider.cpp
index becd893e09..a4eb4546f1 100644
--- a/modules/gapi/src/streaming/onevpl/demux/async_mfp_demux_data_provider.cpp
+++ b/modules/gapi/src/streaming/onevpl/demux/async_mfp_demux_data_provider.cpp
@@ -14,7 +14,9 @@ namespace cv {
 namespace gapi {
 namespace wip {
 namespace onevpl {
-#ifdef _WIN32
+
+#ifdef HAVE_GAPI_MSMF
+
 static HRESULT create_media_source(const std::string& url, IMFMediaSource **ppSource) {
     wchar_t sURL[MAX_PATH];
     GAPI_Assert(url.size() < MAX_PATH && "Windows MAX_PATH limit was reached");
@@ -785,7 +787,7 @@ bool MFPAsyncDemuxDataProvider::empty() const {
            (processing_locked_buffer_storage.size() == 0) &&
            (get_locked_buffer_size() == 0);
 }
-#else // _WIN32
+#else // HAVE_GAPI_MSMF
 
 MFPAsyncDemuxDataProvider::MFPAsyncDemuxDataProvider(const std::string&) {
     GAPI_Error("Unsupported: Microsoft Media Foundation is not available");
@@ -804,7 +806,7 @@ bool MFPAsyncDemuxDataProvider::empty() const {
     GAPI_Error("Unsupported: Microsoft Media Foundation is not available");
     return true;
 }
-#endif // _WIN32
+#endif // HAVE_GAPI_MSMF
 } // namespace onevpl
 } // namespace wip
 } // namespace gapi
diff --git a/modules/gapi/src/streaming/onevpl/demux/async_mfp_demux_data_provider.hpp b/modules/gapi/src/streaming/onevpl/demux/async_mfp_demux_data_provider.hpp
index aab237f413..057e41e429 100644
--- a/modules/gapi/src/streaming/onevpl/demux/async_mfp_demux_data_provider.hpp
+++ b/modules/gapi/src/streaming/onevpl/demux/async_mfp_demux_data_provider.hpp
@@ -16,7 +16,7 @@
 #include "streaming/onevpl/onevpl_export.hpp"
 #include <opencv2/gapi/streaming/onevpl/data_provider_interface.hpp>
 
-#ifdef _WIN32
+#ifdef HAVE_GAPI_MSMF
 #define NOMINMAX
 #include <mfapi.h>
 #include <mfidl.h>
@@ -104,7 +104,7 @@ private:
 } // namespace gapi
 } // namespace cv
 
-#else // _WIN32
+#else // HAVE_GAPI_MSMF
 namespace cv {
 namespace gapi {
 namespace wip {
@@ -121,6 +121,6 @@ struct GAPI_EXPORTS MFPAsyncDemuxDataProvider : public IDataProvider {
 } // namespace gapi
 } // namespace cv
 
-#endif // _WIN32
+#endif // HAVE_GAPI_MSMF
 #endif // HAVE_ONEVPL
 #endif // GAPI_STREAMING_ONEVPL_DEMUX_ASYNC_MFP_DEMUX_DATA_PROVIDER_HPP