# - Try to find ffmpeg libraries (libavcodec, libavformat and libavutil)
# Once done this will define
#
# FFMPEG_FOUND - system has ffmpeg or libav
# FFMPEG_INCLUDE_DIR - the ffmpeg include directory
# FFMPEG_LIBRARIES - Link these to use ffmpeg
# FFMPEG_LIBAVCODEC
# FFMPEG_LIBAVFORMAT
# FFMPEG_LIBAVUTIL
#
# Copyright (c) 2008 Andreas Schneider <mail@cynapses.org>
# Modified for other libraries by Lasse Kärkkäinen <tronic>
# Modified for Hedgewars by Stepik777
# Modified for FFmpeg-example Tuukka Pasanen 2018
#
# Redistribution and use is allowed according to the terms of the New
# BSD license.
#

include(FindPackageHandleStandardArgs)

find_package_handle_standard_args(FFMPEG
    FOUND_VAR FFMPEG_FOUND
    REQUIRED_VARS
        FFMPEG_LIBRARY
        FFMPEG_INCLUDE_DIR
    VERSION_VAR FFMPEG_VERSION
)

if(FFMPEG_LIBRARIES AND FFMPEG_INCLUDE_DIR)
  # in cache already
  set(FFMPEG_FOUND TRUE)
else()
  # use pkg-config to get the directories and then use these values
  # in the FIND_PATH() and FIND_LIBRARY() calls
  find_package(PkgConfig)
  if(PKG_CONFIG_FOUND)
    pkg_check_modules(_FFMPEG_AVCODEC libavcodec)
    pkg_check_modules(_FFMPEG_AVFORMAT libavformat)
    pkg_check_modules(_FFMPEG_AVUTIL libavutil)
    pkg_check_modules(_FFMPEG_AVDEVICE libavdevice)
  endif()

  find_path(FFMPEG_AVCODEC_INCLUDE_DIR
    NAMES libavcodec/avcodec.h
    PATHS ${_FFMPEG_AVCODEC_INCLUDE_DIRS}
      /usr/include
      /usr/local/include
      /opt/local/include
      /sw/include
    PATH_SUFFIXES ffmpeg libav)

  find_library(FFMPEG_LIBAVCODEC
    NAMES avcodec
    PATHS ${_FFMPEG_AVCODEC_LIBRARY_DIRS}
      /usr/lib
      /usr/local/lib
      /opt/local/lib
      /sw/lib)

  find_library(FFMPEG_LIBAVFORMAT
    NAMES avformat
    PATHS ${_FFMPEG_AVFORMAT_LIBRARY_DIRS}
      /usr/lib
      /usr/local/lib
      /opt/local/lib
      /sw/lib)

  find_library(FFMPEG_LIBAVUTIL
    NAMES avutil
    PATHS ${_FFMPEG_AVUTIL_LIBRARY_DIRS}
      /usr/lib
      /usr/local/lib
      /opt/local/lib
      /sw/lib)

    find_library(FFMPEG_LIBAVDEVICE
      NAMES avutil
      PATHS ${_FFMPEG_AVDEVICE_LIBRARY_DIRS}
        /usr/lib
        /usr/local/lib
        /opt/local/lib
        /sw/lib)

  if(FFMPEG_LIBAVCODEC AND FFMPEG_LIBAVFORMAT)
    set(FFMPEG_FOUND TRUE)
  endif()

  if(FFMPEG_FOUND)
    set(FFMPEG_INCLUDE_DIR ${FFMPEG_AVCODEC_INCLUDE_DIR})
    set(FFMPEG_LIBRARIES
      ${FFMPEG_LIBAVCODEC}
      ${FFMPEG_LIBAVFORMAT}
      ${FFMPEG_LIBAVUTIL}
      ${FFMPEG_LIBAVDEVICE})
  endif()

  if(FFMPEG_FOUND)
    if(NOT FFMPEG_FIND_QUIETLY)
      message(STATUS
      "Found FFMPEG or Libav: ${FFMPEG_LIBRARIES}, ${FFMPEG_INCLUDE_DIR}")
    endif()
  else()
    if(FFMPEG_FIND_REQUIRED)
      message(FATAL_ERROR
      "Could not find libavcodec or libavformat or libavutil")
    endif()
  endif()
endif()