implemented sample build in fallback mode without interop

cmake/OpenCVFindVA.cmake

@@ -12,7 +12,7 @@ endif()
 
 if(VA_INCLUDE_DIR)
     set(HAVE_VA TRUE)
-    set(VA_LIBRARIES "-lva")
+    set(VA_LIBRARIES "-lva" "-lva-x11")
 else()
     set(HAVE_VA FALSE)
     message(WARNING "libva installation is not found.")

samples/CMakeLists.txt

@@ -22,7 +22,7 @@ if((NOT ANDROID) AND HAVE_OPENGL)
   add_subdirectory(opengl)
 endif()
 
-if(UNIX AND NOT ANDROID AND HAVE_VA_INTEL)
+if(UNIX AND NOT ANDROID AND (HAVE_VA OR HAVE_VA_INTEL))
   add_subdirectory(va_intel)
 endif()
 

samples/va_intel/CMakeLists.txt

@@ -17,7 +17,7 @@ if(BUILD_EXAMPLES AND OCV_DEPENDENCIES_FOUND)
     set(the_target "example_${project}_${name}")
     add_executable(${the_target} ${srcs})
 
-    ocv_target_link_libraries(${the_target} ${OPENCV_LINKER_LIBS} ${OPENCV_VA_INTEL_SAMPLES_REQUIRED_DEPS} ${VA_INTEL_LIBRARIES})
+    ocv_target_link_libraries(${the_target} ${OPENCV_LINKER_LIBS} ${OPENCV_VA_INTEL_SAMPLES_REQUIRED_DEPS} ${VA_LIBRARIES} ${VA_INTEL_LIBRARIES})
 
     set_target_properties(${the_target} PROPERTIES
       OUTPUT_NAME "${project}-example-${name}"

samples/va_intel/display.cpp.inc

@@ -7,24 +7,38 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include "cvconfig.h"
+
 #include <va/va.h>
+#if defined(HAVE_VA_INTEL)
 # include <va/va_drm.h>
+#elif defined(HAVE_VA)
+# include <va/va_x11.h>
+# include <X11/Xlib.h>
+#endif //HAVE_VA_INTEL / HAVE_VA
+
+namespace va {
+
+#if defined(HAVE_VA_INTEL) || defined(HAVE_VA)
+
+bool openDisplay();
+void closeDisplay();
+
+VADisplay display = NULL;
+bool initialized = false;
+
+#endif //HAVE_VA_INTEL || HAVE_VA
+
+#if defined(HAVE_VA_INTEL)
 
 #define VA_INTEL_PCI_DIR "/sys/bus/pci/devices"
 #define VA_INTEL_DRI_DIR "/dev/dri/"
 #define VA_INTEL_PCI_DISPLAY_CONTROLLER_CLASS 0x03
 
-namespace va {
-
 static unsigned readId(const char* devName, const char* idName);
 static int findAdapter(unsigned desiredVendorId);
 
-bool openDisplay();
-void closeDisplay();
-
 int drmfd = -1;
-VADisplay display = NULL;
-bool initialized = false;
 
 class Directory
 {
@@ -205,4 +219,53 @@ void closeDisplay()
     }
 }
 
+#elif defined(HAVE_VA)
+
+static Display* x11Display = 0;
+
+bool openDisplay()
+{
+    if (!initialized)
+    {
+        display = 0;
+
+        x11Display = XOpenDisplay("");
+        if (x11Display != 0)
+        {
+            display = vaGetDisplay(x11Display);
+            if (display)
+            {
+                int majorVersion = 0, minorVersion = 0;
+                if (vaInitialize(display, &majorVersion, &minorVersion) == VA_STATUS_SUCCESS)
+                {
+                    initialized = true;
+                    return true;
+                }
+                display = 0;
+            }
+            XCloseDisplay(x11Display);
+            x11Display = 0;
+        }
+
+        return false; // Can't initialize X11/VA display
+    }
+    return true;
+}
+
+void closeDisplay()
+{
+    if (initialized)
+    {
+        if (display)
+            vaTerminate(display);
+        if (x11Display)
+            XCloseDisplay(x11Display);
+        display = 0;
+        x11Display = 0;
+        initialized = false;
+    }
+}
+
+#endif // HAVE_VA_INTEL / HAVE_VA
+
 } // namespace va

samples/va_intel/va_intel_interop.cpp

@@ -42,6 +42,7 @@
 #include "opencv2/core.hpp"
 #include "opencv2/imgproc.hpp"
 #include "opencv2/core/va_intel.hpp"
+#include "cvconfig.h"
 
 #define CHECK_VASTATUS(va_status,func)                                  \
 if (va_status != VA_STATUS_SUCCESS) {                                   \
@@ -362,14 +363,20 @@ public:
         {
             int n = 0;
             m_files[0] = m_files[1] = 0;
+#if defined(HAVE_VA_INTEL)
             m_interop = true;
+#elif defined(HAVE_VA)
+            m_interop = false;
+#endif //HAVE_VA_INTEL / HAVE_VA
             for (int i = 1; i < m_argc; ++i)
             {
                 const char *arg = m_argv[i];
                 if (arg[0] == '-') // option
                 {
+#if defined(HAVE_VA_INTEL)
                     if (!strcmp(arg, "-f"))
                         m_interop = false;
+#endif //HAVE_VA_INTEL
                 }
                 else // parameter
                 {
@@ -400,8 +407,15 @@ int main(int argc, char** argv)
     if (!cmd.run())
     {
         fprintf(stderr,
+#if defined(HAVE_VA_INTEL)
                 "Usage: va_intel_interop [-f] file1 file2\n\n"
+                "Interop ON/OFF version\n\n"
                 "where:  -f    option indicates interop is off (fallback mode); interop is on by default\n"
+#elif defined(HAVE_VA)
+                "Usage: va_intel_interop file1 file2\n\n"
+                "Interop OFF only version\n\n"
+                "where:\n"
+#endif //HAVE_VA_INTEL / HAVE_VA
                 "        file1 is to be created, contains original surface data (NV12)\n"
                 "        file2 is to be created, contains processed surface data (NV12)\n");
         exit(0);