# - Try to find FFMPEG
# Once done this will define
#  
#  FFMPEG_FOUND    - system has FFMPEG
#  FFMPEG_INCLUDE_DIR  - the include directories
#  FFMPEG_LIBRARY_DIR  - the directory containing the libraries
#  FFMPEG_LIBRARIES  - link these to use FFMPEG
#  FFMPEG_SWSCALE_FOUND  - FFMPEG also has SWSCALE
#   

SET( FFMPEG_HEADERS avformat.h avcodec.h avutil.h avdevice.h )
SET( FFMPEG_PATH_SUFFIXES libavformat libavcodec libavutil libavdevice libffmpeg )
SET( FFMPEG_SWS_HEADERS swscale.h )
SET( FFMPEG_SWS_PATH_SUFFIXES libswscale )

if( WIN32 )
   SET( FFMPEG_LIBRARIES avformat-52.lib avcodec-51.lib avutil-49.lib avdevice-52.lib )
   SET( FFMPEG_SWS_LIBRARIES swscale-0.lib )
   SET( FFMPEG_LIBRARY_DIR $ENV{FFMPEGDIR}\\lib )
   SET( FFMPEG_INCLUDE_PATHS $ENV{FFMPEGDIR}\\include )

   # check to see if we can find swscale
   SET( TMP_ TMP-NOTFOUND )
   FIND_PATH( TMP_ ${FFMPEG_SWS_LIBRARIES}
        PATHS ${FFMPEG_LIBRARY_DIR} )
   IF ( TMP_ )
      SET( SWSCALE_FOUND TRUE )
   ENDIF( TMP_ )
else( WIN32 )
   SET( FFMPEG_LIBRARIES avformat avcodec avutil avdevice )
   SET( FFMPEG_SWS_LIBRARIES swscale )
   INCLUDE(FindPkgConfig)
   if ( PKG_CONFIG_FOUND )
      pkg_check_modules( AVFORMAT libavformat )
      pkg_check_modules( AVCODEC libavcodec )
      pkg_check_modules( AVUTIL libavutil )
      pkg_check_modules( AVDEVICE libavdevice )
      pkg_check_modules( SWSCALE libswscale )
   endif ( PKG_CONFIG_FOUND )

   SET( FFMPEG_LIBRARY_DIR   ${AVFORMAT_LIBRARY_DIRS}
           ${AVCODEC_LIBRARY_DIRS}
           ${AVUTIL_LIBRARY_DIRS}
           ${AVDEVICE_LIBRARY_DIRS} )
   SET( FFMPEG_INCLUDE_PATHS ${AVFORMAT_INCLUDE_DIRS}
           ${AVCODEC_INCLUDE_DIRS}
           ${AVUTIL_INCLUDE_DIRS}
           ${AVDEVICE_INCLUDE_DIRS} )
endif( WIN32 )

# add in swscale if found
IF ( SWSCALE_FOUND )
   SET( FFMPEG_LIBRARY_DIR   ${FFMPEG_LIBRARY_DIR}
               ${SWSCALE_LIBRARY_DIRS} )
   SET( FFMPEG_INCLUDE_PATHS ${FFMPEG_INCLUDE_PATHS}
               ${SWSCALE_INCLUDE_DIRS} )
   SET( FFMPEG_HEADERS       ${FFMPEG_HEADERS}
               ${FFMPEG_SWS_HEADERS} )
   SET( FFMPEG_PATH_SUFFIXES ${FFMPEG_PATH_SUFFIXES}
               ${FFMPEG_SWS_PATH_SUFFIXES} )
   SET( FFMPEG_LIBRARIES     ${FFMPEG_LIBRARIES}
               ${FFMPEG_SWS_LIBRARIES} )
ENDIF ( SWSCALE_FOUND )

# find includes
SET( INC_SUCCESS 0 )
SET( TMP_ TMP-NOTFOUND )
SET( FFMPEG_INCLUDE_DIR ${FFMPEG_INCLUDE_PATHS} )
FOREACH( INC_ ${FFMPEG_HEADERS} )
   message( "checking: " ${INC_} )

   FIND_PATH( TMP_ ${INC_}
        PATHS ${FFMPEG_INCLUDE_PATHS}
        PATH_SUFFIXES ${FFMPEG_PATH_SUFFIXES} )
   IF ( TMP_ )
      message( "found: " ${TMP_} )
      MATH( EXPR INC_SUCCESS ${INC_SUCCESS}+1 )
      SET( FFMPEG_INCLUDE_DIR ${FFMPEG_INCLUDE_DIR} ${TMP_} )
   ENDIF ( TMP_ )
   SET( TMP_ TMP-NOTFOUND )
ENDFOREACH( INC_ )

# clear out duplicates
if(NOT "${FFMPEG_INCLUDE_DIR}" MATCHES "")
  LIST( REMOVE_DUPLICATES FFMPEG_INCLUDE_DIR )
endif(NOT "${FFMPEG_INCLUDE_DIR}" MATCHES "")
if(NOT "${FFMPEG_LIBRARY_DIR}" MATCHES "")
  LIST( REMOVE_DUPLICATES FFMPEG_LIBRARY_DIR )
endif(NOT "${FFMPEG_LIBRARY_DIR}" MATCHES "")

# find the full paths of the libraries
SET( TMP_ TMP-NOTFOUND )
IF ( NOT WIN32 )
   FOREACH( LIB_ ${FFMPEG_LIBRARIES} )
      FIND_LIBRARY( TMP_ NAMES ${LIB_} PATHS ${FFMPEG_LIBRARY_DIR} )
      IF ( TMP_ )
   SET( FFMPEG_LIBRARIES_FULL ${FFMPEG_LIBRARIES_FULL} ${TMP_} )
      ENDIF ( TMP_ )
      SET( TMP_ TMP-NOTFOUND )
   ENDFOREACH( LIB_ )
   SET ( FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES_FULL} )
ENDIF( NOT WIN32 )

LIST( LENGTH FFMPEG_HEADERS LIST_SIZE_ )

SET( FFMPEG_FOUND FALSE )
SET( FFMPEG_SWSCALE_FOUND FALSE )
IF ( ${INC_SUCCESS} EQUAL ${LIST_SIZE_} )
   SET( FFMPEG_FOUND TRUE )
   SET( FFMPEG_SWSCALE_FOUND ${SWSCALE_FOUND} )
ENDIF ( ${INC_SUCCESS} EQUAL ${LIST_SIZE_} )