dnl Todo: Add Audacity / FFmpeg license
dnl
dnl Please increment the serial number below whenever you alter this macro
dnl for the benefit of automatic macro update systems
# audacity_checklib_ffmpeg.m4 serial 1
dnl Check for a copy of ffmpeg, whoose headers we will use for the importer
AC_DEFUN([AUDACITY_CHECKLIB_FFMPEG], [
   AC_ARG_WITH(ffmpeg,
               [AS_HELP_STRING([--with-ffmpeg],
                               [use ffmpeg for import and export support ])],
               FFMPEG_ARGUMENT=$withval,
               FFMPEG_ARGUMENT="unspecified")

   if false ; then
      AC_DEFINE(USE_FFMPEG, 1,
                [Define if ffmpeg (multi-format import and export) support should be enabled])
   fi

   dnl Check for a system copy of ffmpeg to use. For now I'm insiting on a
   dnl current version to make maintenance easier. We need both avcodec and
   dnl avformat, so I'm going to check for both

   PKG_CHECK_MODULES(AVCODEC, libavcodec >= 51.53,
                     avcodec_available_system="yes",
                     avcodec_available_system="no")
   PKG_CHECK_MODULES(AVFORMAT, libavformat >= 52.12,
                     avformat_available_system="yes",
                     avformat_available_system="no")

   FFMPEG_SYSTEM_AVAILABLE="no"
   if test "x$avcodec_available_system" = "xyes" ; then
      if test "x$avformat_available_system" = "xyes" ; then
	     FFMPEG_SYSTEM_AVAILABLE="yes"
         FFMPEG_SYSTEM_CXXFLAGS="$AVCODEC_CFLAGS $AVFORMAT_CFLAGS"
         FFMPEG_SYSTEM_CPPSYMBOLS="USE_FFMPEG"
		 dnl build the extra object files needed to use FFmpeg. Paths inside
		 dnl the audacity src/ dir, as this is subsitiuted into src/Makefile.in
		 FFMPEG_SYSTEM_OPTOBJS="import/ImportFFmpeg.o export/ExportFFmpeg.o \
		 	export/ExportFFmpegDialogs.o"
         AC_MSG_NOTICE([FFmpeg library available as system library])
      fi
   fi
   if test "x$FFMPEG_SYSTEM_AVAILABLE" = "xno" ; then
      AC_MSG_NOTICE([FFmpeg library NOT available as system library])
   fi

   dnl see if ffmpeg is available locally, or rather that we have some headers
   dnl in lib-src/ffmpeg/ we can use.
   FFMPEG_LOCAL_AVAILABLE="no"
   AC_CHECK_FILE(${srcdir}/lib-src/ffmpeg/libavcodec/avcodec.h,
                 avcodec_h_found="yes",
                 avcodec_h_found="no")

   AC_CHECK_FILE(${srcdir}/lib-src/ffmpeg/libavformat/avformat.h,
                 avformat_h_found="yes",
                 avformat_h_found="no")

   if test "x$avcodec_h_found" = "xyes" ; then
      if test "x$avformat_h_found" = "xyes" ; then
         FFMPEG_LOCAL_AVAILABLE="yes"
         FFMPEG_LOCAL_LIBS=""
         FFMPEG_LOCAL_CXXFLAGS='-I$(top_srcdir)/lib-src/ffmpeg'
         FFMPEG_LOCAL_CPPSYMBOLS="USE_FFMPEG"
         dnl build the extra object files needed to use FFmpeg. Paths inside
         dnl the audacity src/ dir, as this is subsitiuted into src/Makefile.in
         FFMPEG_LOCAL_OPTOBJS="import/ImportFFmpeg.o export/ExportFFmpeg.o \
            export/ExportFFmpegDialogs.o"
         AC_MSG_NOTICE([FFmpeg headers are available in the local tree])
      fi
   fi
   if test "x$FFMPEG_LOCAL_AVAILABLE" = "xno" ; then
      AC_MSG_NOTICE([ffmpeg library is NOT available in the local tree])
   fi
])