#############################################################################
#
# ViSP, open source Visual Servoing Platform software.
# Copyright (C) 2005 - 2023 by Inria. All rights reserved.
#
# This software is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# See the file LICENSE.txt at the root directory of this source
# distribution for additional information about the GNU GPL.
#
# For using ViSP with software that can not be combined with the GNU
# GPL, please contact Inria about acquiring a ViSP Professional
# Edition License.
#
# See https://visp.inria.fr for more information.
#
# This software was developed at:
# Inria Rennes - Bretagne Atlantique
# Campus Universitaire de Beaulieu
# 35042 Rennes Cedex
# France
#
# If you have questions regarding the use of this file, please contact
# Inria at visp@inria.fr
#
# This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
# WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# Description:
# Try to find FFMPEG. FFMpeg depend son Zlib.
# Once run this will define:
#
# FFMPEG_FOUND - system has FFMPEG
# FFMPEG_INCLUDE_DIRS - the FFMPEG include directory
# FFMPEG_LIBRARIES - Link these to use FFMPEG
# FFMPEG_LIBAVCODEC_VERSION
# FFMPEG_LIBAVFORMAT_VERSION
# FFMPEG_LIBAVUTIL_VERSION
# FFMPEG_LIBSWSCALE_VERSION
#
#############################################################################

# detection of the FFMPEG headers location
if(MINGW)
  find_path(FFMPEG_INCLUDE_DIR_AVCODEC
    NAMES
      libavcodec/avcodec.h
    PATHS
    "$ENV{MINGW_DIR}/include"
    C:/mingw/include
    PATH_SUFFIXES
      ffmpeg
  )

  find_path(FFMPEG_INCLUDE_DIR_AVFORMAT
    NAMES
      libavformat/avformat.h
    PATHS
    "$ENV{MINGW_DIR}/include"
    C:/mingw/include
    PATH_SUFFIXES
      ffmpeg
  )

  find_path(FFMPEG_INCLUDE_DIR_AVUTIL
    NAMES
      libavutil/avutil.h
    PATHS
    "$ENV{MINGW_DIR}/include"
    C:/mingw/include
    PATH_SUFFIXES
      ffmpeg
  )

  find_path(FFMPEG_INCLUDE_DIR_SWSCALE
    NAMES
      libswscale/swscale.h
    PATHS
    "$ENV{MINGW_DIR}/include"
    C:/mingw/include
    PATH_SUFFIXES
      libswscale
      ffmpeg
  )

  # Detection of the FFMPEG library on Unix
  find_library(FFMPEG_AVUTIL_LIBRARY
    NAMES
      avutil
    PATHS
   "$ENV{MINGW_DIR}/lib64"
    C:/mingw/lib64
  )
  find_library(FFMPEG_AVCODEC_LIBRARY
    NAMES
      avcodec
    PATHS
    "$ENV{MINGW_DIR}/lib64"
    C:/mingw/lib64
  )
  find_library(FFMPEG_AVFORMAT_LIBRARY
    NAMES
      avformat
    PATHS
    "$ENV{MINGW_DIR}/lib64"
    C:/mingw/lib64
  )

  find_library(FFMPEG_AVCORE_LIBRARY
    NAMES
      avcore
    PATHS
    "$ENV{MINGW_DIR}/lib64"
    C:/mingw/lib64
  )

  find_library(FFMPEG_SWSCALE_LIBRARY
    NAMES
      swscale
    PATHS
    "$ENV{MINGW_DIR}/lib64"
    C:/mingw/lib64
  )
else(MINGW)
  find_path(FFMPEG_INCLUDE_DIR_AVCODEC
    NAMES
      libavcodec/avcodec.h
    PATHS
    "/usr/include"
    "/usr/local/include"
    $ENV{FFMPEG_DIR}/include
    $ENV{FFMPEG_DIR}
    PATH_SUFFIXES
      ffmpeg
  )

  find_path(FFMPEG_INCLUDE_DIR_AVFORMAT
    NAMES
      libavformat/avformat.h
    PATHS
    "/usr/include"
    "/usr/local/include"
    $ENV{FFMPEG_DIR}/include
    $ENV{FFMPEG_DIR}
    PATH_SUFFIXES
      ffmpeg
  )

  find_path(FFMPEG_INCLUDE_DIR_AVUTIL
    NAMES
      libavutil/avutil.h
    PATHS
    "/usr/include"
    "/usr/local/include"
    $ENV{FFMPEG_DIR}/include
    $ENV{FFMPEG_DIR}
    PATH_SUFFIXES
      ffmpeg
  )

  find_path(FFMPEG_INCLUDE_DIR_SWSCALE
    NAMES
      libswscale/swscale.h
    PATHS
    "/usr/include"
    "/usr/local/include"
    $ENV{FFMPEG_DIR}/include
    $ENV{FFMPEG_DIR}
    PATH_SUFFIXES
      libswscale
      ffmpeg
  )

  # Detection of the FFMPEG library on Unix
  find_library(FFMPEG_AVUTIL_LIBRARY
    NAMES
      avutil
    PATHS
    /usr/lib
    /usr/local/lib
    /lib
    $ENV{FFMPEG_DIR}/lib
    $ENV{FFMPEG_DIR}/Release
    $ENV{FFMPEG_DIR}
  )
  find_library(FFMPEG_AVCODEC_LIBRARY
    NAMES
      avcodec
    PATHS
    /usr/lib
    /usr/local/lib
    /lib
    $ENV{FFMPEG_DIR}/lib
    $ENV{FFMPEG_DIR}/Release
    $ENV{FFMPEG_DIR}
  )
  find_library(FFMPEG_AVFORMAT_LIBRARY
    NAMES
      avformat
    PATHS
    /usr/lib
    /usr/local/lib
    /lib
    $ENV{FFMPEG_DIR}/lib
    $ENV{FFMPEG_DIR}/Release
    $ENV{FFMPEG_DIR}
  )

  find_library(FFMPEG_AVCORE_LIBRARY
    NAMES
      avcore
    PATHS
    /usr/lib
    /usr/local/lib
    /lib
    $ENV{FFMPEG_DIR}/lib
    $ENV{FFMPEG_DIR}/Release
    $ENV{FFMPEG_DIR}
  )

  find_library(FFMPEG_SWSCALE_LIBRARY
    NAMES
      swscale
    PATHS
    /usr/lib
    /usr/local/lib
    /lib
    $ENV{FFMPEG_DIR}/lib
    $ENV{FFMPEG_DIR}/Release
    $ENV{FFMPEG_DIR}
  )
endif(MINGW)

# FFMpeg depends on Zlib
find_package(ZLIB)

# FFMpeg depends on BZip2
# with CMake 2.6, the CMake bzip2 package material is named FindBZip2.cmake
# while with CMake 2.8, the name is FindBZIP2.cmake
# that is why we need to call FIND_PACKAGE(BZip2) and FIND_PACKAGE(BZIP2)
find_package(BZIP2 QUIET)
# MESSAGE("BZIP2_FOUND: ${BZIP2_FOUND}")
if(NOT BZIP2_FOUND)
  find_package(BZip2 QUIET)
  # MESSAGE("BZIP2_FOUND: ${BZIP2_FOUND}")
endif()

# FFMpeg may depend also on iconv since probably version 1.1.3 where if detected,
# iconv usage is enabled by default
find_package(Iconv QUIET)
#message("Iconv_FOUND: ${Iconv_FOUND}")

if(FFMPEG_INCLUDE_DIR_AVCODEC AND FFMPEG_INCLUDE_DIR_AVFORMAT AND FFMPEG_INCLUDE_DIR_AVUTIL AND FFMPEG_INCLUDE_DIR_SWSCALE AND FFMPEG_SWSCALE_LIBRARY AND FFMPEG_AVFORMAT_LIBRARY AND FFMPEG_AVCODEC_LIBRARY AND FFMPEG_AVUTIL_LIBRARY AND ZLIB_LIBRARIES AND BZIP2_LIBRARIES)
  set(FFMPEG_FOUND TRUE)
  set(FFMPEG_INCLUDE_DIRS
    ${FFMPEG_INCLUDE_DIR_AVCODEC}
    ${FFMPEG_INCLUDE_DIR_AVFORMAT}
    ${FFMPEG_INCLUDE_DIR_AVUTIL}
    ${FFMPEG_INCLUDE_DIR_SWSCALE}
  )
  set(FFMPEG_LIBRARIES
    ${FFMPEG_SWSCALE_LIBRARY}
    ${FFMPEG_AVFORMAT_LIBRARY}
    ${FFMPEG_AVCODEC_LIBRARY}
    ${FFMPEG_AVUTIL_LIBRARY}
  )
  if(FFMPEG_AVCORE_LIBRARY)
    LIST(APPEND FFMPEG_LIBRARIES ${FFMPEG_AVCORE_LIBRARY})
  endif()
  list(APPEND FFMPEG_LIBRARIES ${ZLIB_LIBRARIES} ${BZIP2_LIBRARIES})
  if(Iconv_FOUND)
    list(APPEND FFMPEG_LIBRARIES ${Iconv_LIBRARIES})
  endif()

elseif(MINGW AND FFMPEG_INCLUDE_DIR_AVCODEC AND FFMPEG_INCLUDE_DIR_AVFORMAT AND FFMPEG_INCLUDE_DIR_AVUTIL AND FFMPEG_INCLUDE_DIR_SWSCALE AND FFMPEG_SWSCALE_LIBRARY AND FFMPEG_AVFORMAT_LIBRARY AND FFMPEG_AVCODEC_LIBRARY AND FFMPEG_AVUTIL_LIBRARY AND ZLIB_LIBRARIES)
  # Bzip2 is nor requested with mingw-w64
  set(FFMPEG_FOUND TRUE)
  set(FFMPEG_INCLUDE_DIRS
    ${FFMPEG_INCLUDE_DIR_AVCODEC}
    ${FFMPEG_INCLUDE_DIR_AVFORMAT}
    ${FFMPEG_INCLUDE_DIR_AVUTIL}
    ${FFMPEG_INCLUDE_DIR_SWSCALE}
  )
  set(FFMPEG_LIBRARIES
    ${FFMPEG_SWSCALE_LIBRARY}
    ${FFMPEG_AVFORMAT_LIBRARY}
    ${FFMPEG_AVCODEC_LIBRARY}
    ${FFMPEG_AVUTIL_LIBRARY}
  )
  if(FFMPEG_AVCORE_LIBRARY)
    LIST(APPEND FFMPEG_LIBRARIES ${FFMPEG_AVCORE_LIBRARY})
  endif()
  list(APPEND FFMPEG_LIBRARIES ${ZLIB_LIBRARIES})
  if(Iconv_FOUND)
    list(APPEND FFMPEG_LIBRARIES ${Iconv_LIBRARIES})
  endif()

else()
  set(FFMPEG_FOUND FALSE)
endif()

if(FFMPEG_FOUND)
  if(EXISTS "${FFMPEG_INCLUDE_DIR_AVCODEC}/libavcodec/version_major.h")
    vp_parse_header("${FFMPEG_INCLUDE_DIR_AVCODEC}/libavcodec/version_major.h" LIBAVCODEC_VERSION_LINES LIBAVCODEC_VERSION_MAJOR)
    vp_parse_header("${FFMPEG_INCLUDE_DIR_AVCODEC}/libavcodec/version.h" LIBAVCODEC_VERSION_LINES LIBAVCODEC_VERSION_MINOR LIBAVCODEC_VERSION_MICRO)
  else()
    vp_parse_header("${FFMPEG_INCLUDE_DIR_AVCODEC}/libavcodec/version.h" LIBAVCODEC_VERSION_LINES LIBAVCODEC_VERSION_MAJOR LIBAVCODEC_VERSION_MINOR LIBAVCODEC_VERSION_MICRO)
  endif()
  set(FFMPEG_LIBAVCODEC_VERSION "${LIBAVCODEC_VERSION_MAJOR}.${LIBAVCODEC_VERSION_MINOR}.${LIBAVCODEC_VERSION_MICRO}")

  if(EXISTS "${FFMPEG_INCLUDE_DIR_AVCODEC}/libavformat/version_major.h")
    vp_parse_header("${FFMPEG_INCLUDE_DIR_AVFORMAT}/libavformat/version_major.h" LIBAVFORMAT_VERSION_LINES LIBAVFORMAT_VERSION_MAJOR)
    vp_parse_header("${FFMPEG_INCLUDE_DIR_AVFORMAT}/libavformat/version.h" LIBAVFORMAT_VERSION_LINES LIBAVFORMAT_VERSION_MINOR LIBAVFORMAT_VERSION_MICRO)
  else()
    vp_parse_header("${FFMPEG_INCLUDE_DIR_AVFORMAT}/libavformat/version.h" LIBAVFORMAT_VERSION_LINES LIBAVFORMAT_VERSION_MAJOR LIBAVFORMAT_VERSION_MINOR LIBAVFORMAT_VERSION_MICRO)
  endif()
  set(FFMPEG_LIBAVFORMAT_VERSION "${LIBAVFORMAT_VERSION_MAJOR}.${LIBAVFORMAT_VERSION_MINOR}.${LIBAVFORMAT_VERSION_MICRO}")

  if(EXISTS "${FFMPEG_INCLUDE_DIR_AVCODEC}/libavutil/version_major.h")
    vp_parse_header("${FFMPEG_INCLUDE_DIR_AVUTIL}/libavutil/version_major.h" LIBAVUTIL_VERSION_LINES LIBAVUTIL_VERSION_MAJOR)
    vp_parse_header("${FFMPEG_INCLUDE_DIR_AVUTIL}/libavutil/version.h" LIBAVUTIL_VERSION_LINES LIBAVUTIL_VERSION_MAJOR LIBAVUTIL_VERSION_MINOR LIBAVUTIL_VERSION_MICRO)
  else()
    vp_parse_header("${FFMPEG_INCLUDE_DIR_AVUTIL}/libavutil/version.h" LIBAVUTIL_VERSION_LINES LIBAVUTIL_VERSION_MAJOR LIBAVUTIL_VERSION_MINOR LIBAVUTIL_VERSION_MICRO)
  endif()
  set(FFMPEG_LIBAVUTIL_VERSION "${LIBAVUTIL_VERSION_MAJOR}.${LIBAVUTIL_VERSION_MINOR}.${LIBAVUTIL_VERSION_MICRO}")

  if(EXISTS "${FFMPEG_INCLUDE_DIR_AVCODEC}/libswscale/version_major.h")
    vp_parse_header("${FFMPEG_INCLUDE_DIR_SWSCALE}/libswscale/version_major.h" LIBSWSCALE_VERSION_LINES LIBSWSCALE_VERSION_MAJOR)
    vp_parse_header("${FFMPEG_INCLUDE_DIR_SWSCALE}/libswscale/version.h" LIBSWSCALE_VERSION_LINES LIBSWSCALE_VERSION_MINOR LIBSWSCALE_VERSION_MICRO)
  else()
    vp_parse_header("${FFMPEG_INCLUDE_DIR_SWSCALE}/libswscale/version.h" LIBSWSCALE_VERSION_LINES LIBSWSCALE_VERSION_MAJOR LIBSWSCALE_VERSION_MINOR LIBSWSCALE_VERSION_MICRO)
  endif()
  set(FFMPEG_LIBSWSCALE_VERSION "${LIBSWSCALE_VERSION_MAJOR}.${LIBSWSCALE_VERSION_MINOR}.${LIBSWSCALE_VERSION_MICRO}")
endif()

mark_as_advanced(
  BZIP2_DIR
  FFMPEG_INCLUDE_DIR_AVCODEC
  FFMPEG_INCLUDE_DIR_AVFORMAT
  FFMPEG_INCLUDE_DIR_AVUTIL
  FFMPEG_INCLUDE_DIR_SWSCALE
  FFMPEG_AVUTIL_LIBRARY
  FFMPEG_AVFORMAT_LIBRARY
  FFMPEG_AVCODEC_LIBRARY
  FFMPEG_SWSCALE_LIBRARY
  FFMPEG_AVCORE_LIBRARY
  FFMPEG_INCLUDE_DIRS
  FFMPEG_LIBRARIES
  FFMPEG_LIBAVCODEC_VERSION
  FFMPEG_LIBAVFORMAT_VERSION
  FFMPEG_LIBAVUTIL_VERSION
  FFMPEG_LIBSWSCALE_VERSION
)