# ----------------------------------------------------------------------------
#  Detect 3rd-party video IO libraries
# ----------------------------------------------------------------------------

ocv_clear_vars(HAVE_VFW)
if(WITH_VFW)
  try_compile(HAVE_VFW
    "${OpenCV_BINARY_DIR}"
    "${OpenCV_SOURCE_DIR}/cmake/checks/vfwtest.cpp"
    CMAKE_FLAGS "-DLINK_LIBRARIES:STRING=vfw32")
endif(WITH_VFW)

# --- GStreamer ---
ocv_clear_vars(HAVE_GSTREAMER)
# try to find gstreamer 1.x first
if(WITH_GSTREAMER)
  CHECK_MODULE(gstreamer-base-1.0 HAVE_GSTREAMER_BASE)
  CHECK_MODULE(gstreamer-video-1.0 HAVE_GSTREAMER_VIDEO)
  CHECK_MODULE(gstreamer-app-1.0 HAVE_GSTREAMER_APP)
  CHECK_MODULE(gstreamer-riff-1.0 HAVE_GSTREAMER_RIFF)
  CHECK_MODULE(gstreamer-pbutils-1.0 HAVE_GSTREAMER_PBUTILS)

  if(HAVE_GSTREAMER_BASE AND HAVE_GSTREAMER_VIDEO AND HAVE_GSTREAMER_APP AND HAVE_GSTREAMER_RIFF AND HAVE_GSTREAMER_PBUTILS)
      set(HAVE_GSTREAMER TRUE)
      set(GSTREAMER_BASE_VERSION ${ALIASOF_gstreamer-base-1.0_VERSION})
      set(GSTREAMER_VIDEO_VERSION ${ALIASOF_gstreamer-video-1.0_VERSION})
      set(GSTREAMER_APP_VERSION ${ALIASOF_gstreamer-app-1.0_VERSION})
      set(GSTREAMER_RIFF_VERSION ${ALIASOF_gstreamer-riff-1.0_VERSION})
      set(GSTREAMER_PBUTILS_VERSION ${ALIASOF_gstreamer-pbutils-1.0_VERSION})
  endif()

endif(WITH_GSTREAMER)

# gstreamer support was requested but could not find gstreamer 1.x,
# so fallback/try to find gstreamer 0.10
if(WITH_GSTREAMER AND NOT HAVE_GSTREAMER)
  set(WITH_GSTREAMER_0_10 ON)
endif()

# if gstreamer 1.x was not found (fallback on gstreamer 0.10), or we specified
# we wanted gstreamer 0.10 support,
# then try to find it if not gstreamer support has not been found so far.
if(WITH_GSTREAMER_0_10 AND NOT HAVE_GSTREAMER)
  CHECK_MODULE(gstreamer-base-0.10 HAVE_GSTREAMER_BASE)
  CHECK_MODULE(gstreamer-video-0.10 HAVE_GSTREAMER_VIDEO)
  CHECK_MODULE(gstreamer-app-0.10 HAVE_GSTREAMER_APP)
  CHECK_MODULE(gstreamer-riff-0.10 HAVE_GSTREAMER_RIFF)
  CHECK_MODULE(gstreamer-pbutils-0.10 HAVE_GSTREAMER_PBUTILS)

  if(HAVE_GSTREAMER_BASE AND HAVE_GSTREAMER_VIDEO AND HAVE_GSTREAMER_APP AND HAVE_GSTREAMER_RIFF AND HAVE_GSTREAMER_PBUTILS)
      set(HAVE_GSTREAMER TRUE)
      set(GSTREAMER_BASE_VERSION ${ALIASOF_gstreamer-base-0.10_VERSION})
      set(GSTREAMER_VIDEO_VERSION ${ALIASOF_gstreamer-video-0.10_VERSION})
      set(GSTREAMER_APP_VERSION ${ALIASOF_gstreamer-app-0.10_VERSION})
      set(GSTREAMER_RIFF_VERSION ${ALIASOF_gstreamer-riff-0.10_VERSION})
      set(GSTREAMER_PBUTILS_VERSION ${ALIASOF_gstreamer-pbutils-0.10_VERSION})
  endif()
endif(WITH_GSTREAMER_0_10 AND NOT HAVE_GSTREAMER)

# --- unicap ---
ocv_clear_vars(HAVE_UNICAP)
if(WITH_UNICAP)
  CHECK_MODULE(libunicap HAVE_UNICAP_)
  CHECK_MODULE(libucil HAVE_UNICAP_UCIL)
  if(HAVE_UNICAP_ AND HAVE_UNICAP_UCIL)
    set(HAVE_UNICAP TRUE)
  endif()
endif(WITH_UNICAP)

# --- PvApi ---
ocv_clear_vars(HAVE_PVAPI)
if(WITH_PVAPI)
  find_path(PVAPI_INCLUDE_PATH "PvApi.h"
            PATHS /usr/local /opt /usr ENV ProgramFiles ENV ProgramW6432
            PATH_SUFFIXES include "Allied Vision Technologies/GigESDK/inc-pc" "AVT GigE SDK/inc-pc" "GigESDK/inc-pc"
            DOC "The path to PvAPI header")

  if(PVAPI_INCLUDE_PATH)
    if(X86 AND NOT WIN32)
      set(PVAPI_SDK_SUBDIR x86)
    elseif(X86_64)
      set(PVAPI_SDK_SUBDIR x64)
    elseif(ARM)
      set(PVAPI_SDK_SUBDIR arm)
    endif()

    get_filename_component(_PVAPI_LIBRARY "${PVAPI_INCLUDE_PATH}/../lib-pc" ABSOLUTE)
    if(PVAPI_SDK_SUBDIR)
      set(_PVAPI_LIBRARY "${_PVAPI_LIBRARY}/${PVAPI_SDK_SUBDIR}")
    endif()
    if(NOT WIN32 AND CMAKE_COMPILER_IS_GNUCXX)
      set(_PVAPI_LIBRARY "${_PVAPI_LIBRARY}/${CMAKE_OPENCV_GCC_VERSION_MAJOR}.${CMAKE_OPENCV_GCC_VERSION_MINOR}")
    endif()

    if(WIN32)
      if(MINGW)
        set(PVAPI_DEFINITIONS "-DPVDECL=__stdcall")
      endif(MINGW)
      set(PVAPI_LIBRARY "${_PVAPI_LIBRARY}/PvAPI.lib" CACHE PATH "The PvAPI library")
    else(WIN32)
      set(PVAPI_LIBRARY "${_PVAPI_LIBRARY}/${CMAKE_STATIC_LIBRARY_PREFIX}PvAPI${CMAKE_STATIC_LIBRARY_SUFFIX}" CACHE PATH "The PvAPI library")
    endif(WIN32)
    if(EXISTS "${PVAPI_LIBRARY}")
      set(HAVE_PVAPI TRUE)
    endif()
  endif(PVAPI_INCLUDE_PATH)
endif(WITH_PVAPI)

# --- GigEVisionSDK ---
ocv_clear_vars(HAVE_GIGE_API)
if(WITH_GIGEAPI)
  find_path(GIGEAPI_INCLUDE_PATH "GigEVisionSDK.h"
            PATHS /usr/local /var /opt /usr ENV ProgramFiles ENV ProgramW6432
            PATH_SUFFIXES include "Smartek Vision Technologies/GigEVisionSDK/gige_cpp" "GigEVisionSDK/gige_cpp" "GigEVisionSDK/gige_c"
            DOC "The path to Smartek GigEVisionSDK header")
  FIND_LIBRARY(GIGEAPI_LIBRARIES NAMES GigEVisionSDK)
  if(GIGEAPI_LIBRARIES AND GIGEAPI_INCLUDE_PATH)
    set(HAVE_GIGE_API TRUE)
  endif()
endif(WITH_GIGEAPI)

# --- Dc1394 ---
ocv_clear_vars(HAVE_DC1394 HAVE_DC1394_2)
if(WITH_1394)
  if(WIN32 AND MINGW)
      find_path(CMU1394_INCLUDE_PATH "/1394common.h"
                PATH_SUFFIXES include
                DOC "The path to cmu1394 headers")
      find_path(DC1394_2_INCLUDE_PATH "/dc1394/dc1394.h"
                PATH_SUFFIXES include
                DOC "The path to DC1394 2.x headers")
      if(CMU1394_INCLUDE_PATH AND DC1394_2_INCLUDE_PATH)
        set(CMU1394_LIB_DIR  "${CMU1394_INCLUDE_PATH}/../lib"  CACHE PATH "Full path of CMU1394 library directory")
        set(DC1394_2_LIB_DIR "${DC1394_2_INCLUDE_PATH}/../lib" CACHE PATH "Full path of DC1394 2.x library directory")
        if(EXISTS "${CMU1394_LIB_DIR}/lib1394camera.a" AND EXISTS "${DC1394_2_LIB_DIR}/libdc1394.a")
          set(HAVE_DC1394_2 TRUE)
        endif()
      endif()
      if(HAVE_DC1394_2)
        ocv_parse_pkg("libdc1394-2" "${DC1394_2_LIB_DIR}/pkgconfig" "")
        ocv_include_directories(${DC1394_2_INCLUDE_PATH})
        set(HIGHGUI_LIBRARIES ${HIGHGUI_LIBRARIES}
            "${DC1394_2_LIB_DIR}/libdc1394.a"
            "${CMU1394_LIB_DIR}/lib1394camera.a")
      endif(HAVE_DC1394_2)
  else(WIN32 AND MINGW)
    CHECK_MODULE(libdc1394-2 HAVE_DC1394_2)
    if(NOT HAVE_DC1394_2)
      CHECK_MODULE(libdc1394 HAVE_DC1394)
    endif()
  endif(WIN32 AND MINGW)
endif(WITH_1394)

# --- xine ---
ocv_clear_vars(HAVE_XINE)
if(WITH_XINE)
  CHECK_MODULE(libxine HAVE_XINE)
endif(WITH_XINE)

# --- V4L ---
ocv_clear_vars(HAVE_LIBV4L HAVE_CAMV4L HAVE_CAMV4L2 HAVE_VIDEOIO)
if(WITH_V4L)
  if(WITH_LIBV4L)
    CHECK_MODULE(libv4l1 HAVE_LIBV4L1)
    CHECK_MODULE(libv4l2 HAVE_LIBV4L2)
    if(HAVE_LIBV4L1 AND HAVE_LIBV4L2)
      set(HAVE_LIBV4L YES)
    else()
      set(HAVE_LIBV4L NO)
    endif()
  endif()
  CHECK_INCLUDE_FILE(linux/videodev.h HAVE_CAMV4L)
  CHECK_INCLUDE_FILE(linux/videodev2.h HAVE_CAMV4L2)
  CHECK_INCLUDE_FILE(sys/videoio.h HAVE_VIDEOIO)
endif(WITH_V4L)

# --- OpenNI ---
ocv_clear_vars(HAVE_OPENNI HAVE_OPENNI_PRIME_SENSOR_MODULE)
if(WITH_OPENNI)
  include("${OpenCV_SOURCE_DIR}/cmake/OpenCVFindOpenNI.cmake")
endif(WITH_OPENNI)

# --- XIMEA ---
ocv_clear_vars(HAVE_XIMEA)
if(WITH_XIMEA)
  include("${OpenCV_SOURCE_DIR}/cmake/OpenCVFindXimea.cmake")
  if(XIMEA_FOUND)
    set(HAVE_XIMEA TRUE)
  endif()
endif(WITH_XIMEA)

# --- FFMPEG ---
ocv_clear_vars(HAVE_FFMPEG HAVE_FFMPEG_CODEC HAVE_FFMPEG_FORMAT HAVE_FFMPEG_UTIL HAVE_FFMPEG_SWSCALE HAVE_FFMPEG_RESAMPLE HAVE_GENTOO_FFMPEG HAVE_FFMPEG_FFMPEG)
if(WITH_FFMPEG)
  if(WIN32 AND NOT ARM)
    include("${OpenCV_SOURCE_DIR}/3rdparty/ffmpeg/ffmpeg_version.cmake")
  elseif(UNIX)
    CHECK_MODULE(libavcodec HAVE_FFMPEG_CODEC)
    CHECK_MODULE(libavformat HAVE_FFMPEG_FORMAT)
    CHECK_MODULE(libavutil HAVE_FFMPEG_UTIL)
    CHECK_MODULE(libswscale HAVE_FFMPEG_SWSCALE)
    CHECK_MODULE(libavresample HAVE_FFMPEG_RESAMPLE)

    CHECK_INCLUDE_FILE(libavformat/avformat.h HAVE_GENTOO_FFMPEG)
    CHECK_INCLUDE_FILE(ffmpeg/avformat.h HAVE_FFMPEG_FFMPEG)
    if(NOT HAVE_GENTOO_FFMPEG AND NOT HAVE_FFMPEG_FFMPEG)
      if(EXISTS /usr/include/ffmpeg/libavformat/avformat.h OR HAVE_FFMPEG_SWSCALE)
        set(HAVE_GENTOO_FFMPEG TRUE)
      endif()
    endif()
    if(HAVE_FFMPEG_CODEC AND HAVE_FFMPEG_FORMAT AND HAVE_FFMPEG_UTIL AND HAVE_FFMPEG_SWSCALE)
      set(HAVE_FFMPEG TRUE)
    endif()

    if(HAVE_FFMPEG)
      # Find the bzip2 library because it is required on some systems
      FIND_LIBRARY(BZIP2_LIBRARIES NAMES bz2 bzip2)
      if(NOT BZIP2_LIBRARIES)
        # Do an other trial
        FIND_FILE(BZIP2_LIBRARIES NAMES libbz2.so.1 PATHS /lib)
      endif()
    else()
      find_path(FFMPEG_INCLUDE_DIR "libavformat/avformat.h"
                PATHS /usr/local /usr /opt
                PATH_SUFFIXES include
                DOC "The path to FFMPEG headers")
      if(FFMPEG_INCLUDE_DIR)
        set(HAVE_GENTOO_FFMPEG TRUE)
        set(FFMPEG_LIB_DIR "${FFMPEG_INCLUDE_DIR}/../lib" CACHE PATH "Full path of FFMPEG library directory")
        find_library(FFMPEG_CODEC_LIB "avcodec" HINTS "${FFMPEG_LIB_DIR}")
        find_library(FFMPEG_FORMAT_LIB "avformat" HINTS "${FFMPEG_LIB_DIR}")
        find_library(FFMPEG_UTIL_LIB "avutil" HINTS "${FFMPEG_LIB_DIR}")
        find_library(FFMPEG_SWSCALE_LIB "swscale" HINTS "${FFMPEG_LIB_DIR}")
        if(FFMPEG_CODEC_LIB AND FFMPEG_FORMAT_LIB AND
           FFMPEG_UTIL_LIB AND FFMPEG_SWSCALE_LIB)
          set(ALIASOF_libavcodec_VERSION "Unknown")
          set(ALIASOF_libavformat_VERSION "Unknown")
          set(ALIASOF_libavutil_VERSION "Unknown")
          set(ALIASOF_libswscale_VERSION "Unknown")
          set(HAVE_FFMPEG 1)
        endif()
      endif(FFMPEG_INCLUDE_DIR)
      if(HAVE_FFMPEG)
        set(HIGHGUI_LIBRARIES ${HIGHGUI_LIBRARIES}
            ${FFMPEG_CODEC_LIB} ${FFMPEG_FORMAT_LIB}
            ${FFMPEG_UTIL_LIB} ${FFMPEG_SWSCALE_LIB})
        ocv_include_directories(${FFMPEG_INCLUDE_DIR})
      endif(HAVE_FFMPEG)
    endif()
  endif()
endif(WITH_FFMPEG)

# --- VideoInput/DirectShow ---
if(WITH_DSHOW)
  # always have VideoInput on Windows
  set(HAVE_DSHOW 1)
endif(WITH_DSHOW)

# --- VideoInput/Microsoft Media Foundation ---
ocv_clear_vars(HAVE_MSMF)
if(WITH_MSMF)
  check_include_file(Mfapi.h HAVE_MSMF)
endif(WITH_MSMF)

# --- Extra HighGUI libs on Windows ---
if(WIN32)
  list(APPEND HIGHGUI_LIBRARIES comctl32 gdi32 ole32 setupapi ws2_32 vfw32)
  if(MINGW64)
    list(APPEND HIGHGUI_LIBRARIES avifil32 avicap32 winmm msvfw32)
    list(REMOVE_ITEM HIGHGUI_LIBRARIES vfw32)
  elseif(MINGW)
    list(APPEND HIGHGUI_LIBRARIES winmm)
  endif()
endif(WIN32)

# --- Apple AV Foundation ---
if(WITH_AVFOUNDATION)
  set(HAVE_AVFOUNDATION YES)
endif()

# --- QuickTime ---
if (NOT IOS)
  if(WITH_QUICKTIME)
    set(HAVE_QUICKTIME YES)
  elseif(APPLE)
    set(HAVE_QTKIT YES)
  endif()
endif()

# --- Intel Perceptual Computing SDK ---
if(WITH_INTELPERC)
  include("${OpenCV_SOURCE_DIR}/cmake/OpenCVFindIntelPerCSDK.cmake")
endif(WITH_INTELPERC)