videoio: plugins support on Win32

modules/core/include/opencv2/core/operations.hpp

@@ -52,7 +52,11 @@
 #include <cstdio>
 
 #if defined(__GNUC__) || defined(__clang__) // at least GCC 3.1+, clang 3.5+
+#  if defined(__MINGW_PRINTF_FORMAT)  // https://sourceforge.net/p/mingw-w64/wiki2/gnu%20printf/.
+#    define CV_FORMAT_PRINTF(string_idx, first_to_check) __attribute__ ((format (__MINGW_PRINTF_FORMAT, string_idx, first_to_check)))
+#  else
 #    define CV_FORMAT_PRINTF(string_idx, first_to_check) __attribute__ ((format (printf, string_idx, first_to_check)))
+#  endif
 #else
 #  define CV_FORMAT_PRINTF(A, B)
 #endif

modules/core/include/opencv2/core/private.hpp

@@ -872,9 +872,17 @@ Passed subdirectories are used in LIFO order.
 */
 CV_EXPORTS void addDataSearchSubDirectory(const cv::String& subdir);
 
-/** @brief Return location of OpenCV libraries or current executable
+/** @brief Retrieve location of OpenCV libraries or current executable
  */
-CV_EXPORTS std::string getBinLocation();
+CV_EXPORTS bool getBinLocation(std::string& dst);
+
+#if defined(_WIN32)
+/** @brief Retrieve location of OpenCV libraries or current executable
+
+@note WIN32 only
+ */
+CV_EXPORTS bool getBinLocation(std::wstring& dst);
+#endif
 
 //! @}
 

modules/core/include/opencv2/core/utils/filesystem.hpp

@@ -28,6 +28,7 @@ CV_EXPORTS cv::String join(const cv::String& base, const cv::String& path);
 
 /** Get parent directory */
 CV_EXPORTS cv::String getParent(const cv::String &path);
+CV_EXPORTS std::wstring getParent(const std::wstring& path);
 
 /**
  * Generate a list of all files that match the globbing pattern.

modules/core/src/utils/datafile.cpp

@@ -144,11 +144,38 @@ static cv::String getModuleLocation(const void* addr)
     return cv::String();
 }
 
-std::string getBinLocation()
+bool getBinLocation(std::string& dst)
 {
-    return getModuleLocation((void*)getModuleLocation); // use code addr, doesn't work with static linkage!
+    dst = getModuleLocation((void*)getModuleLocation); // using code address, doesn't work with static linkage!
+    return !dst.empty();
 }
 
+#ifdef _WIN32
+bool getBinLocation(std::wstring& dst)
+{
+    void* addr = (void*)getModuleLocation; // using code address, doesn't work with static linkage!
+    HMODULE m = 0;
+#if _WIN32_WINNT >= 0x0501
+    ::GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
+        reinterpret_cast<LPCTSTR>(addr),
+        &m);
+#endif
+    if (m)
+    {
+        wchar_t path[4096];
+        const size_t path_size = sizeof(path)/sizeof(*path);
+        size_t sz = GetModuleFileNameW(m, path, path_size);
+        if (sz > 0 && sz < path_size)
+        {
+            path[sz] = '\0';
+            dst.assign(path, sz);
+            return true;
+        }
+    }
+    return false;
+}
+#endif
+
 cv::String findDataFile(const cv::String& relative_path,
                         const char* configuration_parameter,
                         const std::vector<String>* search_paths,
@@ -292,8 +319,15 @@ cv::String findDataFile(const cv::String& relative_path,
         }
     }
 
-    cv::String module_path = getBinLocation();
+    cv::String module_path;
+    if (getBinLocation(module_path))
+    {
         CV_LOG_DEBUG(NULL, "Detected module path: '" << module_path << '\'');
+    }
+    else
+    {
+        CV_LOG_INFO(NULL, "Can't detect module binaries location");
+    }
 
     if (!has_tested_build_directory &&
         (isSubDirectory(build_dir, module_path) || isSubDirectory(utils::fs::canonical(build_dir), utils::fs::canonical(module_path)))

modules/core/src/utils/filesystem.cpp

@@ -91,6 +91,14 @@ CV_EXPORTS cv::String getParent(const cv::String &path)
     return std::string(path, 0, loc);
 }
 
+CV_EXPORTS std::wstring getParent(const std::wstring& path)
+{
+    std::wstring::size_type loc = path.find_last_of(L"/\\");
+    if (loc == std::wstring::npos)
+        return std::wstring();
+    return std::wstring(path, 0, loc);
+}
+
 #if OPENCV_HAVE_FILESYSTEM_SUPPORT
 
 cv::String canonical(const cv::String& path)

modules/videoio/CMakeLists.txt

@@ -131,7 +131,9 @@ if(TARGET ocv.3rdparty.ximea)
 endif()
 
 if(TARGET ocv.3rdparty.ffmpeg)
-  if("ffmpeg" IN_LIST VIDEOIO_PLUGIN_LIST)
+  if(HAVE_FFMPEG_WRAPPER)
+    list(APPEND tgts ocv.3rdparty.ffmpeg)
+  elseif("ffmpeg" IN_LIST VIDEOIO_PLUGIN_LIST)
     ocv_create_builtin_videoio_plugin("opencv_videoio_ffmpeg" ocv.3rdparty.ffmpeg "cap_ffmpeg.cpp")
   else()
     list(APPEND videoio_hdrs ${CMAKE_CURRENT_LIST_DIR}/src/cap_ffmpeg_impl.hpp)
@@ -202,7 +204,7 @@ ocv_target_link_libraries(${the_module} LINK_PRIVATE ${tgts})
 # copy FFmpeg dll to the output folder
 if(WIN32 AND HAVE_FFMPEG_WRAPPER)
   if(MSVC64 OR MINGW64)
-    set(FFMPEG_SUFFIX _64)
+    set(FFMPEG_SUFFIX "_64")
   endif()
   set(ffmpeg_dir "${OpenCV_BINARY_DIR}/3rdparty/ffmpeg")
   set(ffmpeg_bare_name "opencv_ffmpeg${FFMPEG_SUFFIX}.dll")

modules/videoio/cmake/detect_ffmpeg.cmake

@@ -54,12 +54,10 @@ endif()
 
 #==================================
 
-if(HAVE_FFMPEG)
-  set(defs "HAVE_FFMPEG")
-  if(HAVE_FFMPEG_WRAPPER)
-    list(APPEND defs "HAVE_FFMPEG_WRAPPER")
-  endif()
-  ocv_add_external_target(ffmpeg "${FFMPEG_INCLUDE_DIRS}" "${FFMPEG_LIBRARIES}" "${defs}")
+if(HAVE_FFMPEG_WRAPPER)
+  ocv_add_external_target(ffmpeg "" "" "HAVE_FFMPEG_WRAPPER")
+elseif(HAVE_FFMPEG)
+  ocv_add_external_target(ffmpeg "${FFMPEG_INCLUDE_DIRS}" "${FFMPEG_LIBRARIES}" "HAVE_FFMPEG")
 endif()
 
 set(HAVE_FFMPEG ${HAVE_FFMPEG} PARENT_SCOPE)

modules/videoio/cmake/plugin.cmake

@@ -25,9 +25,22 @@ function(ocv_create_builtin_videoio_plugin name target)
     ocv_target_include_directories(${name} PRIVATE "${OPENCV_MODULE_${mod}_LOCATION}/include")
   endforeach()
 
+  if(WIN32)
+    set(OPENCV_PLUGIN_VERSION "${OPENCV_DLLVERSION}" CACHE STRING "")
+    if(CMAKE_CXX_SIZEOF_DATA_PTR EQUAL 8)
+      set(OPENCV_PLUGIN_ARCH "_64" CACHE STRING "")
+    else()
+      set(OPENCV_PLUGIN_ARCH "" CACHE STRING "")
+    endif()
+  else()
+    set(OPENCV_PLUGIN_VERSION "" CACHE STRING "")
+    set(OPENCV_PLUGIN_ARCH "" CACHE STRING "")
+  endif()
+
   set_target_properties(${name} PROPERTIES
     CXX_STANDARD 11
     CXX_VISIBILITY_PRESET hidden
+    OUTPUT_NAME "${name}${OPENCV_PLUGIN_VERSION}${OPENCV_PLUGIN_ARCH}"
   )
 
   if(WIN32)

modules/videoio/cmake/plugin_standalone.cmake

@@ -28,7 +28,7 @@ function(ocv_create_videoio_plugin default_name target target_desc videoio_src_f
     message(FATAL_ERROR "${target_desc} was not found!")
   endif()
 
-  set(modules_ROOT "${CMAKE_CURRENT_LIST_DIR}/../../..")
+  get_filename_component(modules_ROOT "${CMAKE_CURRENT_LIST_DIR}/../../.." ABSOLUTE)
   set(videoio_ROOT "${modules_ROOT}/videoio")
   set(core_ROOT "${modules_ROOT}/core")
   set(imgproc_ROOT "${modules_ROOT}/imgproc")
@@ -45,22 +45,20 @@ function(ocv_create_videoio_plugin default_name target target_desc videoio_src_f
   )
   target_compile_definitions(${OPENCV_PLUGIN_NAME} PRIVATE BUILD_PLUGIN)
 
-  # Fixes for build
-  target_compile_definitions(${OPENCV_PLUGIN_NAME} PRIVATE __OPENCV_BUILD)
-  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/cvconfig.h" "#pragma once")
-  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/cv_cpu_config.h" "#pragma once")
-  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/opencv2/opencv_modules.hpp" "#pragma once")
-
   target_link_libraries(${OPENCV_PLUGIN_NAME} PRIVATE ${target})
   set_target_properties(${OPENCV_PLUGIN_NAME} PROPERTIES
     CXX_STANDARD 11
     CXX_VISIBILITY_PRESET hidden
   )
 
+  if(DEFINED OPENCV_PLUGIN_MODULE_PREFIX)
+    set_target_properties(${OPENCV_PLUGIN_NAME} PROPERTIES PREFIX "${OPENCV_PLUGIN_MODULE_PREFIX}")
+  endif()
+
   # Hack for Windows
   if(WIN32)
     find_package(OpenCV REQUIRED core imgproc videoio)
-    target_link_libraries(${OPENCV_PLUGIN_NAME} ${OpenCV_LIBS})
+    target_link_libraries(${OPENCV_PLUGIN_NAME} PRIVATE ${OpenCV_LIBS})
   endif()
 
   if(OPENCV_PLUGIN_DESTINATION)
@@ -68,6 +66,8 @@ function(ocv_create_videoio_plugin default_name target target_desc videoio_src_f
     message(STATUS "Output destination: ${OPENCV_PLUGIN_DESTINATION}")
   endif()
 
+  install(TARGETS ${OPENCV_PLUGIN_NAME} LIBRARY DESTINATION . COMPONENT plugins)
+
   message(STATUS "Library name: ${OPENCV_PLUGIN_NAME}")
 
 endfunction()

modules/videoio/src/backend_plugin.cpp

@@ -29,10 +29,43 @@ namespace cv { namespace impl {
 
 #if defined(_WIN32)
 typedef HMODULE LibHandle_t;
-#elif defined(__linux__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__)
+typedef wchar_t FileSystemChar_t;
+typedef std::wstring FileSystemPath_t;
+
+static
+FileSystemPath_t toFileSystemPath(const std::string& p)
+{
+    FileSystemPath_t result;
+    result.resize(p.size());
+    for (size_t i = 0; i < p.size(); i++)
+        result[i] = (wchar_t)p[i];
+    return result;
+}
+static
+std::string toPrintablePath(const FileSystemPath_t& p)
+{
+    std::string result;
+    result.resize(p.size());
+    for (size_t i = 0; i < p.size(); i++)
+    {
+        wchar_t ch = p[i];
+        if ((int)ch >= ' ' && (int)ch < 128)
+            result[i] = (char)ch;
+        else
+            result[i] = '?';
+    }
+    return result;
+}
+#else  // !_WIN32
 typedef void* LibHandle_t;
+typedef char FileSystemChar_t;
+typedef std::string FileSystemPath_t;
+
+static inline FileSystemPath_t toFileSystemPath(const std::string& p) { return p; }
+static inline std::string toPrintablePath(const FileSystemPath_t& p) { return p; }
 #endif
 
+
 static Mutex& getInitializationMutex()
 {
     static Mutex initializationMutex;
@@ -50,12 +83,16 @@ void* getSymbol_(LibHandle_t h, const char* symbolName)
 }
 
 static inline
-LibHandle_t libraryLoad_(const char* filename)
+LibHandle_t libraryLoad_(const FileSystemPath_t& filename)
 {
 #if defined(_WIN32)
-    return LoadLibraryA(filename);
+# ifdef WINRT
+    return LoadPackagedLibrary(filename.c_str(), 0);
+# else
+    return LoadLibraryW(filename.c_str());
+#endif
 #elif defined(__linux__) || defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__)
-    return dlopen(filename, RTLD_LAZY);
+    return dlopen(filename.c_str(), RTLD_LAZY);
 #endif
 }
 
@@ -73,7 +110,7 @@ static inline
 std::string libraryPrefix()
 {
 #if defined(_WIN32)
-    return string();
+    return "";
 #else
     return "lib";
 #endif
@@ -82,9 +119,13 @@ static inline
 std::string librarySuffix()
 {
 #if defined(_WIN32)
-    return ".dll";
-#elif defined(__APPLE__)
-    return ".dylib";
+    const char* suffix = ""
+        CVAUX_STR(CV_MAJOR_VERSION) CVAUX_STR(CV_MINOR_VERSION) CVAUX_STR(CV_SUBMINOR_VERSION)
+    #if (defined _MSC_VER && defined _M_X64) || (defined __GNUC__ && defined __x86_64__)
+        "_64"
+    #endif
+        ".dll";
+    return suffix;
 #else
     return ".so";
 #endif
@@ -96,10 +137,10 @@ class DynamicLib
 {
 private:
     LibHandle_t handle;
-    const std::string fname;
+    const FileSystemPath_t fname;
 
 public:
-    DynamicLib(const std::string &filename)
+    DynamicLib(const FileSystemPath_t& filename)
         : handle(0), fname(filename)
     {
         libraryLoad(filename);
@@ -120,21 +161,21 @@ public:
         }
         void * res = getSymbol_(handle, symbolName);
         if (!res)
-            CV_LOG_ERROR(NULL, "No symbol '" << symbolName << "' in " << fname);
+            CV_LOG_ERROR(NULL, "No symbol '" << symbolName << "' in " << toPrintablePath(fname));
         return res;
     }
-    const std::string& getName() const { return fname; }
+    const std::string getName() const { return toPrintablePath(fname); }
 private:
-    void libraryLoad(const std::string &filename)
+    void libraryLoad(const FileSystemPath_t& filename)
     {
-        handle = libraryLoad_(filename.c_str());
-        CV_LOG_INFO(NULL, "load " << filename << " => " << (handle ? "OK" : "FAILED"));
+        handle = libraryLoad_(filename);
+        CV_LOG_INFO(NULL, "load " << toPrintablePath(filename) << " => " << (handle ? "OK" : "FAILED"));
     }
     void libraryRelease()
     {
-        CV_LOG_INFO(NULL, "unload "<< fname);
         if (handle)
         {
+            CV_LOG_INFO(NULL, "unload "<< toPrintablePath(fname));
             libraryRelease_(handle);
             handle = 0;
         }
@@ -230,39 +271,79 @@ protected:
 };
 
 static
-std::vector<string> getPluginCandidates(const std::string& baseName)
+std::vector<FileSystemPath_t> getPluginCandidates(const std::string& baseName)
 {
     using namespace cv::utils;
     using namespace cv::utils::fs;
+    const string baseName_l = toLowerCase(baseName);
+    const string baseName_u = toUpperCase(baseName);
+    const FileSystemPath_t baseName_l_fs = toFileSystemPath(baseName_l);
+    vector<FileSystemPath_t> paths;
+    const vector<string> paths_ = getConfigurationParameterPaths("OPENCV_VIDEOIO_PLUGIN_PATH", vector<string>());
+    if (paths_.size() != 0)
+    {
+        for (size_t i = 0; i < paths_.size(); i++)
+        {
+            paths.push_back(toFileSystemPath(paths_[i]));
+        }
+    }
+    else
+    {
+        FileSystemPath_t binaryLocation;
+        if (getBinLocation(binaryLocation))
+        {
+            binaryLocation = getParent(binaryLocation);
 #ifndef CV_VIDEOIO_PLUGIN_SUBDIRECTORY
-#define CV_VIDEOIO_PLUGIN_SUBDIRECTORY_STR ""
+            paths.push_back(binaryLocation);
 #else
-#define CV_VIDEOIO_PLUGIN_SUBDIRECTORY_STR CVAUX_STR(CV_VIDEOIO_PLUGIN_SUBDIRECTORY)
+            paths.push_back(binaryLocation + toFileSystemPath("/") + toFileSystemPath(CV_VIDEOIO_PLUGIN_SUBDIRECTORY_STR));
 #endif
-    const vector<string> default_paths = { utils::fs::join(getParent(getBinLocation()), CV_VIDEOIO_PLUGIN_SUBDIRECTORY_STR) };
-    const vector<string> paths = getConfigurationParameterPaths("OPENCV_VIDEOIO_PLUGIN_PATH", default_paths);
-    const string baseName_l = toLowerCase(baseName);
-    const string baseName_u = toUpperCase(baseName);
+        }
+    }
     const string default_expr = libraryPrefix() + "opencv_videoio_" + baseName_l + "*" + librarySuffix();
-    const string expr = getConfigurationParameterString((std::string("OPENCV_VIDEOIO_PLUGIN_") + baseName_u).c_str(), default_expr.c_str());
-    CV_LOG_INFO(NULL, "VideoIO pluigin (" << baseName << "): glob is '" << expr << "', " << paths.size() << " location(s)");
-    vector<string> results;
-    for(const string & path : paths)
+    const string plugin_expr = getConfigurationParameterString((std::string("OPENCV_VIDEOIO_PLUGIN_") + baseName_u).c_str(), default_expr.c_str());
+    vector<FileSystemPath_t> results;
+#ifdef _WIN32
+    FileSystemPath_t moduleName = toFileSystemPath(libraryPrefix() + "opencv_videoio_" + baseName_l + librarySuffix());
+#ifndef WINRT
+    if (baseName_u == "FFMPEG")  // backward compatibility
+    {
+        const wchar_t* ffmpeg_env_path = _wgetenv(L"OPENCV_FFMPEG_DLL_DIR");
+        if (ffmpeg_env_path)
+        {
+            results.push_back(FileSystemPath_t(ffmpeg_env_path) + L"\\" + moduleName);
+        }
+    }
+#endif
+    if (plugin_expr != default_expr)
+    {
+        moduleName = toFileSystemPath(plugin_expr);
+        results.push_back(moduleName);
+    }
+    for (const FileSystemPath_t& path : paths)
+    {
+        results.push_back(path + L"\\" + moduleName);
+    }
+    results.push_back(moduleName);
+#else
+    CV_LOG_INFO(NULL, "VideoIO pluigin (" << baseName << "): glob is '" << plugin_expr << "', " << paths.size() << " location(s)");
+    for (const string & path : paths)
     {
         if (path.empty())
             continue;
         vector<string> candidates;
-        cv::glob(utils::fs::join(path, expr), candidates);
+        cv::glob(utils::fs::join(path, plugin_expr), candidates);
         CV_LOG_INFO(NULL, "    - " << path << ": " << candidates.size());
         copy(candidates.begin(), candidates.end(), back_inserter(results));
     }
+#endif
     CV_LOG_INFO(NULL, "Found " << results.size() << " plugin(s) for " << baseName);
     return results;
 }
 
 void PluginBackendFactory::loadPlugin()
 {
-    for(const std::string & plugin : getPluginCandidates(baseName_))
+    for (const FileSystemPath_t& plugin : getPluginCandidates(baseName_))
     {
         Ptr<DynamicLib> lib = makePtr<DynamicLib>(plugin);
         if (!lib->isLoaded())
@@ -287,7 +368,7 @@ void PluginBackendFactory::loadPlugin()
         }
         catch (...)
         {
-            CV_LOG_INFO(NULL, "Video I/O: exception during plugin initialization: " << plugin << ". SKIP");
+            CV_LOG_WARNING(NULL, "Video I/O: exception during plugin initialization: " << toPrintablePath(plugin) << ". SKIP");
         }
     }
 }

modules/videoio/src/cap_ffmpeg.cpp

@@ -41,11 +41,12 @@
 
 #include "precomp.hpp"
 
-#if defined(HAVE_FFMPEG)
+#if !defined(HAVE_FFMPEG)
+#error "Build configuration error"
+#endif
 
 #include <string>
 
-#if !defined(HAVE_FFMPEG_WRAPPER)
 #include "cap_ffmpeg_impl.hpp"
 
 #define icvCreateFileCapture_FFMPEG_p cvCreateFileCapture_FFMPEG
@@ -58,152 +59,6 @@
 #define icvReleaseVideoWriter_FFMPEG_p cvReleaseVideoWriter_FFMPEG
 #define icvWriteFrame_FFMPEG_p cvWriteFrame_FFMPEG
 
-#else
-
-#include "cap_ffmpeg_api.hpp"
-
-namespace cv { namespace {
-
-static CvCreateFileCapture_Plugin icvCreateFileCapture_FFMPEG_p = 0;
-static CvReleaseCapture_Plugin icvReleaseCapture_FFMPEG_p = 0;
-static CvGrabFrame_Plugin icvGrabFrame_FFMPEG_p = 0;
-static CvRetrieveFrame_Plugin icvRetrieveFrame_FFMPEG_p = 0;
-static CvSetCaptureProperty_Plugin icvSetCaptureProperty_FFMPEG_p = 0;
-static CvGetCaptureProperty_Plugin icvGetCaptureProperty_FFMPEG_p = 0;
-static CvCreateVideoWriter_Plugin icvCreateVideoWriter_FFMPEG_p = 0;
-static CvReleaseVideoWriter_Plugin icvReleaseVideoWriter_FFMPEG_p = 0;
-static CvWriteFrame_Plugin icvWriteFrame_FFMPEG_p = 0;
-
-static cv::Mutex _icvInitFFMPEG_mutex;
-
-#if defined _WIN32
-static const HMODULE cv_GetCurrentModule()
-{
-    HMODULE h = 0;
-#if _WIN32_WINNT >= 0x0501
-    ::GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS | GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
-        reinterpret_cast<LPCTSTR>(cv_GetCurrentModule),
-        &h);
-#endif
-    return h;
-}
-#endif
-
-class icvInitFFMPEG
-{
-public:
-    static void Init()
-    {
-        cv::AutoLock al(_icvInitFFMPEG_mutex);
-        static icvInitFFMPEG init;
-    }
-
-private:
-    #if defined _WIN32
-    HMODULE icvFFOpenCV;
-
-    ~icvInitFFMPEG()
-    {
-        if (icvFFOpenCV)
-        {
-            FreeLibrary(icvFFOpenCV);
-            icvFFOpenCV = 0;
-        }
-    }
-    #endif
-
-    icvInitFFMPEG()
-    {
-#if defined _WIN32
-        const wchar_t* module_name_ = L"opencv_ffmpeg"
-            CVAUX_STRW(CV_MAJOR_VERSION) CVAUX_STRW(CV_MINOR_VERSION) CVAUX_STRW(CV_SUBMINOR_VERSION)
-        #if (defined _MSC_VER && defined _M_X64) || (defined __GNUC__ && defined __x86_64__)
-            L"_64"
-        #endif
-            L".dll";
-    # ifdef WINRT
-        icvFFOpenCV = LoadPackagedLibrary( module_name_, 0 );
-    # else
-        const std::wstring module_name(module_name_);
-
-        const wchar_t* ffmpeg_env_path = _wgetenv(L"OPENCV_FFMPEG_DLL_DIR");
-        std::wstring module_path =
-                ffmpeg_env_path
-                ? ((std::wstring(ffmpeg_env_path) + L"\\") + module_name)
-                : module_name;
-
-        icvFFOpenCV = LoadLibraryW(module_path.c_str());
-        if(!icvFFOpenCV && !ffmpeg_env_path)
-        {
-            HMODULE m = cv_GetCurrentModule();
-            if (m)
-            {
-                wchar_t path[MAX_PATH];
-                const size_t path_size = sizeof(path)/sizeof(*path);
-                size_t sz = GetModuleFileNameW(m, path, path_size);
-                /* Don't handle paths longer than MAX_PATH until that becomes a real issue */
-                if (sz > 0 && sz < path_size)
-                {
-                    wchar_t* s = wcsrchr(path, L'\\');
-                    if (s)
-                    {
-                        s[0] = 0;
-                        module_path = (std::wstring(path) + L"\\") + module_name;
-                        icvFFOpenCV = LoadLibraryW(module_path.c_str());
-                    }
-                }
-            }
-        }
-    # endif
-
-        if( icvFFOpenCV )
-        {
-            icvCreateFileCapture_FFMPEG_p =
-                (CvCreateFileCapture_Plugin)GetProcAddress(icvFFOpenCV, "cvCreateFileCapture_FFMPEG");
-            icvReleaseCapture_FFMPEG_p =
-                (CvReleaseCapture_Plugin)GetProcAddress(icvFFOpenCV, "cvReleaseCapture_FFMPEG");
-            icvGrabFrame_FFMPEG_p =
-                (CvGrabFrame_Plugin)GetProcAddress(icvFFOpenCV, "cvGrabFrame_FFMPEG");
-            icvRetrieveFrame_FFMPEG_p =
-                (CvRetrieveFrame_Plugin)GetProcAddress(icvFFOpenCV, "cvRetrieveFrame_FFMPEG");
-            icvSetCaptureProperty_FFMPEG_p =
-                (CvSetCaptureProperty_Plugin)GetProcAddress(icvFFOpenCV, "cvSetCaptureProperty_FFMPEG");
-            icvGetCaptureProperty_FFMPEG_p =
-                (CvGetCaptureProperty_Plugin)GetProcAddress(icvFFOpenCV, "cvGetCaptureProperty_FFMPEG");
-            icvCreateVideoWriter_FFMPEG_p =
-                (CvCreateVideoWriter_Plugin)GetProcAddress(icvFFOpenCV, "cvCreateVideoWriter_FFMPEG");
-            icvReleaseVideoWriter_FFMPEG_p =
-                (CvReleaseVideoWriter_Plugin)GetProcAddress(icvFFOpenCV, "cvReleaseVideoWriter_FFMPEG");
-            icvWriteFrame_FFMPEG_p =
-                (CvWriteFrame_Plugin)GetProcAddress(icvFFOpenCV, "cvWriteFrame_FFMPEG");
-# endif // _WIN32
-#if 0
-            if( icvCreateFileCapture_FFMPEG_p != 0 &&
-                icvReleaseCapture_FFMPEG_p != 0 &&
-                icvGrabFrame_FFMPEG_p != 0 &&
-                icvRetrieveFrame_FFMPEG_p != 0 &&
-                icvSetCaptureProperty_FFMPEG_p != 0 &&
-                icvGetCaptureProperty_FFMPEG_p != 0 &&
-                icvCreateVideoWriter_FFMPEG_p != 0 &&
-                icvReleaseVideoWriter_FFMPEG_p != 0 &&
-                icvWriteFrame_FFMPEG_p != 0 )
-            {
-                printf("Successfully initialized ffmpeg plugin!\n");
-            }
-            else
-            {
-                printf("Failed to load FFMPEG plugin: module handle=%p\n", icvFFOpenCV);
-            }
-#endif
-        }
-    }
-};
-
-
-}} // namespace
-#endif // HAVE_FFMPEG_WRAPPER
-
-
 
 namespace cv {
 namespace {
@@ -247,11 +102,7 @@ public:
     }
     virtual void close()
     {
-        if (ffmpegCapture
-#if defined(HAVE_FFMPEG_WRAPPER)
-                && icvReleaseCapture_FFMPEG_p
-#endif
-)
+        if (ffmpegCapture)
             icvReleaseCapture_FFMPEG_p( &ffmpegCapture );
         CV_Assert(ffmpegCapture == 0);
         ffmpegCapture = 0;
@@ -268,11 +119,6 @@ protected:
 
 cv::Ptr<cv::IVideoCapture> cvCreateFileCapture_FFMPEG_proxy(const std::string &filename)
 {
-#if defined(HAVE_FFMPEG_WRAPPER)
-    icvInitFFMPEG::Init();
-    if (!icvCreateFileCapture_FFMPEG_p)
-        return cv::Ptr<cv::IVideoCapture>();
-#endif
     cv::Ptr<CvCapture_FFMPEG_proxy> capture = cv::makePtr<CvCapture_FFMPEG_proxy>(filename);
     if (capture && capture->isOpened())
         return capture;
@@ -308,11 +154,7 @@ public:
 
     virtual void close()
     {
-        if (ffmpegWriter
-#if defined(HAVE_FFMPEG_WRAPPER)
-                && icvReleaseVideoWriter_FFMPEG_p
-#endif
-        )
+        if (ffmpegWriter)
             icvReleaseVideoWriter_FFMPEG_p( &ffmpegWriter );
         CV_Assert(ffmpegWriter == 0);
         ffmpegWriter = 0;
@@ -330,11 +172,6 @@ protected:
 
 cv::Ptr<cv::IVideoWriter> cvCreateVideoWriter_FFMPEG_proxy(const std::string& filename, int fourcc, double fps, const cv::Size &frameSize, bool isColor)
 {
-#if defined(HAVE_FFMPEG_WRAPPER)
-    icvInitFFMPEG::Init();
-    if (!icvCreateVideoWriter_FFMPEG_p)
-        return cv::Ptr<cv::IVideoWriter>();
-#endif
     cv::Ptr<CvVideoWriter_FFMPEG_proxy> writer = cv::makePtr<CvVideoWriter_FFMPEG_proxy>(filename, fourcc, fps, frameSize, isColor != 0);
     if (writer && writer->isOpened())
         return writer;
@@ -343,7 +180,7 @@ cv::Ptr<cv::IVideoWriter> cvCreateVideoWriter_FFMPEG_proxy(const std::string& fi
 
 } // namespace
 
-#endif // defined(HAVE_FFMPEG)
+
 
 //==================================================================================================
 

modules/videoio/src/cap_ffmpeg_api.hpp → modules/videoio/src/cap_ffmpeg_legacy_api.hpp

-#ifndef __OPENCV_FFMPEG_H__
-#define __OPENCV_FFMPEG_H__
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+#ifndef __OPENCV_FFMPEG_LEGACY_API_H__
+#define __OPENCV_FFMPEG_LEGACY_API_H__
 
 #ifdef __cplusplus
 extern "C"
@@ -7,7 +10,7 @@ extern "C"
 #endif
 
 #ifndef OPENCV_FFMPEG_API
-#if defined(__OPENCV_BUILD) || defined(BUILD_PLUGIN)
+#if defined(__OPENCV_BUILD)
 #   define OPENCV_FFMPEG_API
 #elif defined _WIN32
 #   define OPENCV_FFMPEG_API __declspec(dllexport)
@@ -18,20 +21,6 @@ extern "C"
 #endif
 #endif
 
-enum
-{
-    CV_FFMPEG_CAP_PROP_POS_MSEC=0,
-    CV_FFMPEG_CAP_PROP_POS_FRAMES=1,
-    CV_FFMPEG_CAP_PROP_POS_AVI_RATIO=2,
-    CV_FFMPEG_CAP_PROP_FRAME_WIDTH=3,
-    CV_FFMPEG_CAP_PROP_FRAME_HEIGHT=4,
-    CV_FFMPEG_CAP_PROP_FPS=5,
-    CV_FFMPEG_CAP_PROP_FOURCC=6,
-    CV_FFMPEG_CAP_PROP_FRAME_COUNT=7,
-    CV_FFMPEG_CAP_PROP_SAR_NUM=40,
-    CV_FFMPEG_CAP_PROP_SAR_DEN=41
-};
-
 typedef struct CvCapture_FFMPEG CvCapture_FFMPEG;
 typedef struct CvVideoWriter_FFMPEG CvVideoWriter_FFMPEG;
 
@@ -50,46 +39,8 @@ OPENCV_FFMPEG_API int cvWriteFrame_FFMPEG(struct CvVideoWriter_FFMPEG* writer, c
                                           int step, int width, int height, int cn, int origin);
 OPENCV_FFMPEG_API void cvReleaseVideoWriter_FFMPEG(struct CvVideoWriter_FFMPEG** writer);
 
-typedef CvCapture_FFMPEG* (*CvCreateFileCapture_Plugin)( const char* filename );
-typedef CvCapture_FFMPEG* (*CvCreateCameraCapture_Plugin)( int index );
-typedef int (*CvGrabFrame_Plugin)( CvCapture_FFMPEG* capture_handle );
-typedef int (*CvRetrieveFrame_Plugin)( CvCapture_FFMPEG* capture_handle, unsigned char** data, int* step,
-                                       int* width, int* height, int* cn );
-typedef int (*CvSetCaptureProperty_Plugin)( CvCapture_FFMPEG* capture_handle, int prop_id, double value );
-typedef double (*CvGetCaptureProperty_Plugin)( CvCapture_FFMPEG* capture_handle, int prop_id );
-typedef void (*CvReleaseCapture_Plugin)( CvCapture_FFMPEG** capture_handle );
-typedef CvVideoWriter_FFMPEG* (*CvCreateVideoWriter_Plugin)( const char* filename, int fourcc,
-                                             double fps, int width, int height, int iscolor );
-typedef int (*CvWriteFrame_Plugin)( CvVideoWriter_FFMPEG* writer_handle, const unsigned char* data, int step,
-                                    int width, int height, int cn, int origin);
-typedef void (*CvReleaseVideoWriter_Plugin)( CvVideoWriter_FFMPEG** writer );
-
-/*
- * For CUDA encoder
- */
-
-OPENCV_FFMPEG_API struct OutputMediaStream_FFMPEG* create_OutputMediaStream_FFMPEG(const char* fileName, int width, int height, double fps);
-OPENCV_FFMPEG_API void release_OutputMediaStream_FFMPEG(struct OutputMediaStream_FFMPEG* stream);
-OPENCV_FFMPEG_API void write_OutputMediaStream_FFMPEG(struct OutputMediaStream_FFMPEG* stream, unsigned char* data, int size, int keyFrame);
-
-typedef struct OutputMediaStream_FFMPEG* (*Create_OutputMediaStream_FFMPEG_Plugin)(const char* fileName, int width, int height, double fps);
-typedef void (*Release_OutputMediaStream_FFMPEG_Plugin)(struct OutputMediaStream_FFMPEG* stream);
-typedef void (*Write_OutputMediaStream_FFMPEG_Plugin)(struct OutputMediaStream_FFMPEG* stream, unsigned char* data, int size, int keyFrame);
-
-/*
- * For CUDA decoder
- */
-
-OPENCV_FFMPEG_API struct InputMediaStream_FFMPEG* create_InputMediaStream_FFMPEG(const char* fileName, int* codec, int* chroma_format, int* width, int* height);
-OPENCV_FFMPEG_API void release_InputMediaStream_FFMPEG(struct InputMediaStream_FFMPEG* stream);
-OPENCV_FFMPEG_API int read_InputMediaStream_FFMPEG(struct InputMediaStream_FFMPEG* stream, unsigned char** data, int* size, int* endOfFile);
-
-typedef struct InputMediaStream_FFMPEG* (*Create_InputMediaStream_FFMPEG_Plugin)(const char* fileName, int* codec, int* chroma_format, int* width, int* height);
-typedef void (*Release_InputMediaStream_FFMPEG_Plugin)(struct InputMediaStream_FFMPEG* stream);
-typedef int (*Read_InputMediaStream_FFMPEG_Plugin)(struct InputMediaStream_FFMPEG* stream, unsigned char** data, int* size, int* endOfFile);
-
 #ifdef __cplusplus
 }
 #endif
 
-#endif
+#endif  // __OPENCV_FFMPEG_LEGACY_API_H__

modules/videoio/src/precomp.hpp

@@ -46,7 +46,9 @@
 #include "opencv2/videoio/legacy/constants_c.h"
 
 #include "opencv2/core/utility.hpp"
+#ifdef __OPENCV_BUILD
 #include "opencv2/core/private.hpp"
+#endif
 
 #include <opencv2/core/utils/configuration.private.hpp>
 #include <opencv2/core/utils/logger.hpp>

modules/videoio/src/videoio_registry.cpp

@@ -58,7 +58,7 @@ static const struct VideoBackendInfo builtin_backends[] =
 {
 #ifdef HAVE_FFMPEG
     DECLARE_STATIC_BACKEND(CAP_FFMPEG, "FFMPEG", MODE_CAPTURE_BY_FILENAME | MODE_WRITER, cvCreateFileCapture_FFMPEG_proxy, 0, cvCreateVideoWriter_FFMPEG_proxy),
-#elif defined(ENABLE_PLUGINS)
+#elif defined(ENABLE_PLUGINS) || defined(HAVE_FFMPEG_WRAPPER)
     DECLARE_DYNAMIC_BACKEND(CAP_FFMPEG, "FFMPEG", MODE_CAPTURE_BY_FILENAME | MODE_WRITER),
 #endif