cmake/Modules/FindFFmpeg.cmake

# - Try to find ffmpeg libraries
#     (libavcodec, libavformat, libavutil, libswscale)
# 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
#

if (FFMPEG_LIBRARIES AND FFMPEG_INCLUDE_DIR)
  # in cache already
  set(FFMPEG_FOUND TRUE)
else (FFMPEG_LIBRARIES AND FFMPEG_INCLUDE_DIR)

  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_LIBSWSCALE
    NAMES swscale
    PATHS ${_FFMPEG_SWSCALE_LIBRARY_DIRS} /usr/lib /usr/local/lib /opt/local/lib /sw/lib
  )

  find_library(FFMPEG_LIBSWRESAMPLE
    NAMES swresample
    PATHS ${_FFMPEG_SWSCALE_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_LIBSWSCALE}
      ${FFMPEG_LIBSWRESAMPLE}
    )

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

endif (FFMPEG_LIBRARIES AND FFMPEG_INCLUDE_DIR)