opencv/modules/videoio/cmake/detect_dshow.cmake

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CMake
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# --- VideoInput/DirectShow ---
if(NOT HAVE_DSHOW AND MSVC AND NOT MSVC_VERSION LESS 1500)
set(HAVE_DSHOW TRUE)
endif()
if(NOT HAVE_DSHOW)
check_include_file(dshow.h HAVE_DSHOW)
endif()
if(HAVE_DSHOW)
ocv_add_external_target(dshow "" "" "HAVE_DSHOW")
endif()