dnl Process this file with autoconf to produce a configure script.

AC_PREREQ(2.52)
AC_INIT(configure.in)
AM_CONFIG_HEADER(config.h)

GAP_MAJOR_VERSION=2
GAP_MINOR_VERSION=6
GAP_MICRO_VERSION=0
GAP_VERSION=$GAP_MAJOR_VERSION.$GAP_MINOR_VERSION.$GAP_MICRO_VERSION
VERSION=$GAP_VERSION
GAP_VERSION_WITH_DATE="$GAP_VERSION; 2009/05/19"

AC_SUBST(GAP_MAJOR_VERSION)
AC_SUBST(GAP_MINOR_VERSION)
AC_SUBST(GAP_MICRO_VERSION)
AC_SUBST(GAP_VERSION)
AC_SUBST(GAP_VERSION_WITH_DATE)
	
AC_DEFINE_UNQUOTED(GAP_MAJOR_VERSION, $GAP_MAJOR_VERSION,
				      [gimp-gap major release number])
AC_DEFINE_UNQUOTED(GAP_MINOR_VERSION, $GAP_MINOR_VERSION,
				      [gimp-gap minor release number])
AC_DEFINE_UNQUOTED(GAP_MICRO_VERSION, $GAP_MICRO_VERSION,
				      [gimp-gap micro release number])

AC_DEFINE_UNQUOTED(GAP_VERSION_WITH_DATE, "$GAP_VERSION_WITH_DATE",
				      [gimp-gap version string for registrating gap plug-ins])

AM_INIT_AUTOMAKE(gimp-gap, $VERSION)

AM_MAINTAINER_MODE

AC_CANONICAL_HOST

AC_PROG_CC
AC_ISC_POSIX
AM_PROG_CC_STDC
AC_HEADER_STDC

AC_PROG_RANLIB

ACLOCAL="$ACLOCAL $ACLOCAL_FLAGS"

GETTEXT_PACKAGE=gimp20-gap
AC_SUBST(GETTEXT_PACKAGE)
AC_DEFINE_UNQUOTED(GETTEXT_PACKAGE, "$GETTEXT_PACKAGE",
                   [The gettext translation domain.])

AC_CHECK_HEADERS(unistd.h)
AC_CHECK_FUNCS(bind_textdomain_codeset)


PKG_CHECK_MODULES(GIMP, gimp-2.0 >= 2.6.0 gimpui-2.0 >= 2.6.0 gimpthumb-2.0)

GIMP_DATA_DIR=`$PKG_CONFIG gimp-2.0 --variable=gimpdatadir`
GIMP_PLUGIN_DIR=`$PKG_CONFIG gimp-2.0 --variable=gimplibdir`

AC_SUBST(GIMP_DATA_DIR)
AC_SUBST(GIMP_PLUGIN_DIR)


PKG_CHECK_MODULES(GLIB, glib-2.0 >= 2.8.0)

NEW_LINE="
"

AC_MSG_CHECKING([for target architecture])
case x"$target" in
  xNONE | x)
    target_or_host="$host" ;;
  *)
    target_or_host="$target" ;;
esac
AC_MSG_RESULT([$target_or_host])

dnl check if gmake is available
EXGMAKE=make
AC_CHECK_PROG(GMAKE_AVAILABLE, gmake, yes, no)
if test $GMAKE_AVAILABLE = yes; then
  EXGMAKE=gmake
fi
AC_SUBST(EXGMAKE)

dnl prefix and suffix of librarynames (for win32 environment)
dnl notes:
dnl older gimp-gap releases automatically used .lib suffix (MSVC style) when build runs in MinGW
dnl Win32 environment. (see notes on bug #324854 reported 2005.12.23 for details)
dnl Now i have setup a MinGW build environment based on gcc where
dnl ffmpeg-0.5 libraries are built in unix typical stlye ending with extension .a
dnl i added the configure option --enable-win32libnames to support
dnl old behaviour (but build with MSVC is not tested and not fully supported and probably may fail)

MINGW_LIBPREF="lib"
MINGW_LIBSUF=".a"

AC_ARG_ENABLE(win32libnames,
              [  --enable-win32libnames     use MSVC style for library extension .lib instead of .a on MinGW environment])
  if test "x$enable_win32libnames" = "xyes"; then
    MINGW_LIBPREF=""
    MINGW_LIBSUF=".lib"
  fi
  

AC_MSG_CHECKING([for native Win32])
case "$target_or_host" in
  *-*-mingw*)
    os_win32=yes
    PATHSEP=';'
    LIBPREF="$MINGW_LIBPREF"
    LIBSUF="$MINGW_LIBSUF"
    ;;
  *)
    os_win32=no
    PATHSEP=':'
    LIBPREF="lib"
    LIBSUF=".a"
    ;;
esac
AC_MSG_RESULT([$os_win32])
AC_SUBST(PATHSEP)
AC_SUBST(LIBPREF)
AC_SUBST(LIBSUF)
AM_CONDITIONAL(OS_WIN32, test "$os_win32" = "yes")

dnl Test for unix-frontends
dnl -----------------------
AC_ARG_ENABLE(unixfrontends,
              [  --enable-unix-frontends     build with UNIX specific frontends for OLD programs xanim and mpeg encoders])
  if test "x$enable_unix_frontends" = "xyes"; then

    dnl disable unix frontends per default on win32 systems (unless explicte specified yes)
    if test "x$os_win32" = "xyes"; then
       enable_unix_frontends=no
       frontends_warning="
WARNING: the --enable-unix-frontends is ignored on  Windows build
"
    else
       frontends_warning="
gimp-gap is configured with Linux/UNIX specific frontends for OLD  xanim
and OLD mpeg encoders.
"
    fi

  else
     enable_unix_frontends=no
  fi

AM_CONDITIONAL(GAP_UNIX_FRONTENDS, test "x$enable_unix_frontends" != "xno")


dnl check for bzip2 library (for ffmpeg matroskadec )
dnl the check result does not matter unless libavformat is linked or built later on.
FF_BZIP2=""
ffbz2_warn=""
AC_ARG_ENABLE(ff_libbz2,
              [  --disable-ff-libbz2          configure libavformat without libbz2 disables matroskadec bz2 support])
  if test "x$enable_ff_libbz2" != "xno"; then
    AC_CHECK_LIB(bz2, BZ2_bzDecompressInit,
        [AC_CHECK_HEADER(bzlib.h,
          FF_BZIP2="-lbz2",
          ffbz2_warn="$NEW_LINE ** bzip2 header file (bzlib.h) not found (limited support for ffmpeg matroskadec codec )")],
      ffbz2_warn="bzip2 library (libbz2) not found (there will be limited support)")    
  fi


dnl ## libmp3lame lame/lame.h lame_init -lmp3lame -lm

dnl check for libmp3lame library (useful for ffmpeg audio MP3 support)
dnl the check result does not matter unless libavformat is linked or built later on.
FF_LIBMP3LAME=""
mp3lame_warn=""
AC_ARG_ENABLE(ff_libmp3lame,
              [  --disable-ff-libmp3lame          configure libavformat without libmp3lame])
  if test "x$enable_ff_libmp3lame" != "xno"; then
    AC_CHECK_LIB(mp3lame, lame_init,
        [AC_CHECK_HEADER(lame/lame.h,
          FF_LIBMP3LAME="-lmp3lame",
          mp3lame_warn="$NEW_LINE ** mp3lame header file (lame/lame.h) not found (not critical)")],
      mp3lame_warn="mp3lame library (libmp3lame) not found (not critical)")    
  fi
dnl

dnl check for faac library (useful for better ffmpeg audio support)
dnl FAAC is an open source MPEG-4 and MPEG-2 AAC encoder, it is licensed under the LGPL 
dnl the check result does not matter unless libavformat is linked or built later on.
FF_LIBFAAC=""
faac_warn=""
AC_ARG_ENABLE(ff_libfaac,
              [  --disable-ff-libfaac          configure libavformat without libfaac])
  if test "x$enable_ff_libfaac" != "xno"; then
    AC_CHECK_LIB(faac, faacEncGetVersion,
        [AC_CHECK_HEADER(faac.h,
          FF_LIBFAAC="-lfaac",
          faac_warn="$NEW_LINE ** faac header file (faac.h) not found (not critical)")],
      faac_warn="faac library (libfaac) not found (not critical)")    
  fi
dnl

dnl check for faad library (useful for better ffmpeg audio support)
dnl FAAC is an open source MPEG-4 and MPEG-2 AAC encoder, it is licensed under the LGPL 
dnl the check result does not matter unless libavformat is linked or built later on.
FF_LIBFAAD=""
faad_warn=""
AC_ARG_ENABLE(ff_libfaad,
              [  --disable-ff-libfaad          configure libavformat without libfaad])
  if test "x$enable_ff_libfaad" != "xno"; then
    AC_CHECK_LIB(faad, NeAACDecOpen,
        [AC_CHECK_HEADER(faad.h,
          FF_LIBFAAD="-lfaad",
          faad_warn="$NEW_LINE ** faad header file (faad.h) not found (not critical)")],
      faad_warn="faad library (libfaad) not found (not critical)")    

    dnl additional check for faad1 library (that is also sufficient for building ffmpeg 0.5)

    if test "x$FF_LIBFAAD" = "x"; then
      AC_CHECK_LIB(faad, faacDecOpen,
        [AC_CHECK_HEADER(faad.h,
          FF_LIBFAAD="-lfaad",
          faad_warn="$NEW_LINE ** faad header file (faad.h) not found (not critical)")],
        faad_warn="faad library (libfaad) not found (not critical)")    
    fi

  fi
dnl



dnl check for x264 library (additional for ffmpeg video codec support)
dnl ### TODO check are no longer sufficient for recent ffmpeg 2009.01.31.
dnl ### check shall verify the condition "X264_BUILD >= 65
dnl ### Note that the missing check it is not critical, since ffmpeg configure script has such a check
dnl ###      and turns off x264 support when older versions are detected, and prints an error like this:
dnl ###          ERROR: libx264 version must be >= 0.65.
dnl the check result does not matter unless libavformat is linked or built later on.
FF_LIBX264=""
x264_warn=""
AC_ARG_ENABLE(ff_libx264,
              [  --disable-ff-libx264         configure libavformat without optional open source variant of H264 video codec])
  if test "x$enable_ff_libx264" != "xno"; then
    AC_CHECK_LIB(x264, x264_encoder_open,
      [AC_CHECK_HEADER(x264.h,
          FF_LIBX264="-lx264",
          x264_warn="$NEW_LINE x264 header file (x264.h) not found (not critical, but no open H264 video codec support)")],
      x264_warn="$NEW_LINE x264 library (libx264) not found (not critical, but no open H264 video codec support)")   
  fi


dnl check for xvid library (additional for ffmpeg open xvid video codec support)
dnl the check result does not matter unless libavformat is linked or built later on.
xvid_warn=""
FF_LIBXVID=""
AC_ARG_ENABLE(ff_libxvid,
              [  --disable-ff-libxvid         configure libavformat without optional open source variant of xvid video codec])
  if test "x$enable_ff_libxvid" != "xno"; then
    AC_CHECK_LIB(xvidcore, xvid_global,
      [AC_CHECK_HEADER(xvid.h,
          FF_LIBXVID="-lxvidcore",
          xvid_warn="$NEW_LINE xvid header file (xvid.h) not found (not critical, but no open xvid video codec support)")],
      xvid_warn="$NEW_LINE xvid library (libxvidcore) not found (not critical, but no open xvid video codec support)")   
  fi



dnl Test for videoapisupport
dnl ------------------------
AC_ARG_ENABLE(videoapisupport,
              [  --disable-videoapi-support   don't build with videoapi support])
  if test "x$enable_videoapi_support" != "xno"; then
    AC_DEFINE(GAP_ENABLE_VIDEOAPI_SUPPORT, 1,
              [Define to 1 to enable videoapi support])
  else
        videoapi_warning="
gimp-gap is configured without video API (libgapvidapi.a)
   There will be NO access to videofiles (mpeg, avi...) in the storyboard
   plug-in and the videoextract plug-in will not work at all.
   To compile with video API run configure with
   the --enable-videoapi-support option.
"

  fi

AM_CONDITIONAL(GAP_VIDEOAPI_SUPPORT, test "x$enable_videoapi_support" != "xno")


dnl get name of current and parent dir
pwd_dir=`pwd`
cd ..
parent_dir=`pwd`
cd "$pwd_dir"
extern_libs_dir="$pwd_dir/extern_libs"

dnl Test for video libavformat (FFMPEG)
dnl -----------------------------------
dnl the ffmpeg libs are both used as decoder implementations in the GAP Video API (GVA)
dnl and in the ffmpeg videoencoder  plug-in
dnl ffmpeg should compile on many operating systems, including UNIX and WINDOWS systems
dnl
dnl the current gimp-gap preferes static linking with ffmpeg (svn snaphots 2007.03.01 or later)
dnl therefore the ffmpeg sourcetree should be specified --with-ffmpegdir=DIR
dnl a permanent ffmpeg installation is not required in that case, but the libraries 
dnl   libavutil.a libavformat.a and libavcodec.a
dnl must be already built there. 
dnl
dnl
FFMPEG_DIRNAME="ffmpeg"
FFMPEG_TARBALL="$extern_libs_dir/ffmpeg.tar.gz"

dnl where to find the ffmpeg sourcedir (expanded ffmpeg tarball)
FFMPEG_DIR="$extern_libs_dir/$FFMPEG_DIRNAME"

AC_ARG_WITH(ffmpegsrcdir, [  --with-ffmpegsrcdir=DIR      specify where to find ffmpeg src directory DIR (this is a developers option to bypass the included ffmpeg sourcetree)],
if eval "test x$with_ffmpegsrcdir != x"; then
  if eval "test x$with_ffmpegsrcdir != xyes"; then
    if test -d "$with_ffmpegsrcdir"; then
      FFMPEG_DIR=$with_ffmpegsrcdir
    else
      echo "** ERROR option --with-ffmpegsrcdir must refere to a directory"
      echo "** $with_ffmpegsrcdir  is not a directory"
    fi
  fi
fi)


dnl assume ffmpeg libs build "no" (in case disabled)
build_ffmpeg_libs_yesno="no"

AC_ARG_WITH(ff-extra-cflags, [  --with-ff-extra-cflags=cflags    specify extra c-compiler flags for compiling ffmpeg],
   FF_EXTRA_CFLAGS=$with_ff_extra_cflags)

AC_ARG_WITH(ff-extra-ldflags, [  --with-ff-extra-ldflags=ldflags    specify extra linker flags for linking ffmpeg libs],
   FF_EXTRA_LDFLAGS=$with_ff_extra_ldflags)


moved_old_ffmpeg_warn=""
AC_ARG_ENABLE(libavformat,
              [  --disable-libavformat        don't build with libavformat/libavcodec/libavutil])
  if test "x$enable_libavformat" != "xno"; then
    dnl

    dnl check if old ffmpeg version(s) that were once part of GIMP-GAP are still there .
    dnl typically for SVN users after an svn update. note that ffmpeg source tree
    dnl is not under svn control and is derived from the tarball.

    FF_FILE_AVCODEC_H="$FFMPEG_DIR/libavcodec/avcodec.h"
    FF_FILE_AVFORMAT_H="$FFMPEG_DIR/libavformat/avformat.h"

    echo "checking $FF_FILE_AVCODEC_H for old content"
    
    ffmpeg_dir_is_old="no"
    if test -f "$FF_FILE_AVCODEC_H"; then
      if  grep '#define LIBAVCODEC_VERSION      51.47.2' $FF_FILE_AVCODEC_H >/dev/null; then
        ffmpeg_dir_is_old="yes"
      fi
    fi
    echo "checking files $FF_FILE_AVFORMAT_H for old content"
    if test -f "$FF_FILE_AVFORMAT_H"; then
      if  grep 'avformat_alloc_context' $FF_FILE_AVFORMAT_H >/dev/null; then
        echo "checking ffmpeg/libavformat/avformat.h supports avformat_alloc_context (OK)"
      else
        ffmpeg_dir_is_old="yes"
      fi
    fi
    
    if eval "test x$ffmpeg_dir_is_old = xyes"; then
        mv "$FFMPEG_DIR" "$FFMPEG_DIR-OLD"
        echo "** UPDATE of ffmpeg forced, moving $FFMPEG_DIR  to $FFMPEG_DIR-OLD"
        moved_old_ffmpeg_warn="
INFORMATION: old ffmpeg was moved to $FFMPEG_DIR-OLD
(you may delete the old ffmpeg directory)
"
    fi

    AC_DEFINE(ENABLE_GVA_LIBAVFORMAT, 1,
              [Define to 1 to enable compile and link with libavformat])
    dnl
    if test -d "$FFMPEG_DIR"; then
      dnl
      echo "FFMPEG sourcetree found at dir: $FFMPEG_DIR"
    else
      if test -f "$FFMPEG_TARBALL"; then
        cd "$extern_libs_dir"
        echo "extracting tarball: $FFMPEG_TARBALL"
	gzip -d -c "$FFMPEG_TARBALL" | tar -x
	cd "$pwd_dir"
      else
        echo "** error FFMPEG tarball not found, file: $FFMPEG_TARBALL"
      fi
    fi
    dnl
    dnl
    if test -d "$FFMPEG_DIR"; then
      dnl
      echo "FFMPEG sourcetree found at dir: $FFMPEG_DIR"
      dnl
      dnl STATIC linking of the ffmpeg libs libavformat.a libavcodec.a libavutil.a
      dnl from sourcedirectory
      dnl
      dnl   sequence of libs does matter  1. libavformat.a  2. libavcodec.a 3. libavutil.a
      dnl
      dnl Note: on minGW ffmpeg static libraries have suffix .lib (and not .a)
      dnl  
      build_ffmpeg_libs_yesno="yes"
      FFMPEG_LIBAVFORMAT_A="$FFMPEG_DIR/libavformat/${LIBPREF}avformat${LIBSUF}"
      FFMPEG_LIBAVCODEC_A="$FFMPEG_DIR/libavcodec/${LIBPREF}avcodec${LIBSUF}"
      FFMPEG_LIBAVUTIL_A="$FFMPEG_DIR/libavutil/${LIBPREF}avutil${LIBSUF}"
      FFMPEG_LIBAVDEVICE_A="$FFMPEG_DIR/libavdevice/${LIBPREF}avdevice${LIBSUF}"
      dnl
      dnl ffmpeg can be configured to use external codec libs x264, xvid ....
      dnl options for ffmpeg ext libs configuration will be passed to ffmpeg/configure
      dnl if some of those libs are installed (and not explicitly disabled)
      
      FFMPEG_EXTLIBS="$FF_LIBX264 $FF_LIBXVID $FF_BZIP2 $FF_LIBMP3LAME $FF_LIBFAAC $FF_LIBFAAD"
      if  test "x$os_win32" = "xyes"; then
        FFMPEG_EXTLIBS="$FFMPEG_EXTLIBS -lws2_32"
      fi

      GAP_VLIBS_FFMPEG="  $FFMPEG_LIBAVDEVICE_A $FFMPEG_LIBAVFORMAT_A $FFMPEG_LIBAVCODEC_A $FFMPEG_LIBAVUTIL_A $FFMPEG_EXTLIBS "
      GAP_VINCS_FFMPEG=" -I$FFMPEG_DIR -I$FFMPEG_DIR/libavcodec -I$FFMPEG_DIR/libavformat -I$FFMPEG_DIR/libavutil -I$FFMPEG_DIR/libavdevice "

      vid_ffmpeg_warning="
          $x264_warn
          $xvid_warn
          $ffbz2_warn 
          $mp3lame_warn 
          $faac_warn 
          $faad_warn
          "

      dnl read configure options for the external lib from a file      
      dnl the current simple implementation requires all options in one line
      FFMPEG_CONFIGURE_OPTIONS=`cat "$extern_libs_dir/configure_options_ffmpeg.txt" | grep -v '^#'`
      
      ff_pass_through_flags=""
      if test "x$prefix" != "x"; then
         if test "$prefix" != "NONE"; then
            ff_pass_through_flags=" --prefix=$prefix $ff_pass_through_flags"
         fi
      fi
      
      if test "x$FF_EXTRA_CFLAGS" != "x"; then
      	 ff_pass_through_flags=" $ff_pass_through_flags --extra-cflags=$FF_EXTRA_CFLAGS "
      fi
      
      if test "x$FF_EXTRA_LDFLAGS" != "x"; then
      	 ff_pass_through_flags=" $ff_pass_through_flags --extra-ldflags=$FF_EXTRA_LDFLAGS "
      fi

      if test "x$CC" != "x"; then
      	 ff_pass_through_flags=" $ff_pass_through_flags --cc=$CC "
      fi
      
      FFMPEG_CONFIGURE_OPTIONS=" $ff_pass_through_flags $FFMPEG_CONFIGURE_OPTIONS"
 
 

      dnl configure ffmpeg bzip2 usage
      if test "x$FF_BZIP2" != "x"; then
      	 FFMPEG_CONFIGURE_OPTIONS="$FFMPEG_CONFIGURE_OPTIONS --enable-bzlib"
      else
      	 FFMPEG_CONFIGURE_OPTIONS="$FFMPEG_CONFIGURE_OPTIONS --disable-bzlib"
      fi

      dnl configure ffmpeg with optional audio libraries --enable-libmp3lame --enable-libfaac --enable-libfaad
      if test "x$FF_LIBMP3LAME" != "x"; then
      	 FFMPEG_CONFIGURE_OPTIONS="$FFMPEG_CONFIGURE_OPTIONS --enable-libmp3lame"
      fi
      if test "x$FF_LIBFAAC" != "x"; then
      	 FFMPEG_CONFIGURE_OPTIONS="$FFMPEG_CONFIGURE_OPTIONS --enable-libfaac"
      fi
      if test "x$FF_LIBFAAD" != "x"; then
      	 FFMPEG_CONFIGURE_OPTIONS="$FFMPEG_CONFIGURE_OPTIONS --enable-libfaad"
      fi

      dnl configure ffmpeg libx264 usage (for optional H.264 codec support via libx264)
      if test "x$FF_LIBX264" != "x"; then
      	 FFMPEG_CONFIGURE_OPTIONS="$FFMPEG_CONFIGURE_OPTIONS --enable-libx264"
      fi

      dnl configure ffmpeg libxvid usage (for optional open xvid codec support via libxvid)
      if test "x$FF_LIBXVID" != "x"; then
      	 FFMPEG_CONFIGURE_OPTIONS="$FFMPEG_CONFIGURE_OPTIONS --enable-libxvid"
      fi
      
      if  test "x$os_win32" = "xyes"; then
         dnl here we could check for required win32 api version on MonGW Win32 Systems.
         dnl for now always disable devices on MinGW (that requires latest win32 api to compile)
         dnl disabling devices is not critical since GIMP-GAP does not use ffmpeg features that
         dnl require other access than plain videofile io.
      	 FFMPEG_CONFIGURE_OPTIONS="$FFMPEG_CONFIGURE_OPTIONS --disable-devices"
      fi

      echo "================================="
      echo "Calling FFMPEG configure script options: $FFMPEG_CONFIGURE_OPTIONS"
      echo "================================="
      
      cd "$FFMPEG_DIR"
      ./configure $FFMPEG_CONFIGURE_OPTIONS
      FF_CONFIGURE_RETCODE=$?
      cd "$pwd_dir"
      
      echo "================================="
      echo "FFMPEG configure script done options: $FFMPEG_CONFIGURE_OPTIONS"
      echo "FFMPEG configure retcode: $FF_CONFIGURE_RETCODE"
      echo "================================="

      if test "$FF_CONFIGURE_RETCODE" != "0"; then
         vid_ffmpeg_warning="ffmpeg configure script FAILED (--disable-libavformat was activated due to this ERROR)"
         build_ffmpeg_libs_yesno="no"
      fi
      
      dnl
      dnl
    else
      vid_ffmpeg_warning="
** ERROR: ffmpeg sourcetree was not found at:       
$FFMPEG_DIR

  this directory should be created automatically by extracting
  the tarball $FFMPEG_TARBALL

  if this tarball is not included in your gimp-gap distribution
  you can get the ffmpeg tarball at:
    http://www.ffmpeg.org/
    or http://ffmpeg.mplayerhq.hu/download.html
    (old http://ffmpeg.sourceforge.net)
  
  The configure option --disable-libavformat was activated due to this ERROR.
  (This reduces the number of supported videoformats both for read and write
   access.)

"
      dnl options for dynamic linking. (currently not supported via configure script)
      dnl GAP_VINCS_FFMPEG=" -I/usr/include/ffmpeg"
      dnl GAP_VLIBS_FFMPEG=" -lavcodec -lavformat -lavutil"
      dnl
    fi
  else
        vid_ffmpeg_warning="
gimp-gap is configured without libavformat
   This reduces the number of supported videoformats both for read and write
   access. libavformat, libavcodec and libavutil are part of $FFMPEG_DIRNAME.
"
        GAP_VLIBS_FFMPEG=" "
        GAP_VINCS_FFMPEG=" "
  fi

AM_CONDITIONAL(ENABLE_GVA_LIBAVFORMAT_SUPPORT, test "x$enable_libavformat" != "xno")


dnl Test for video libmpeg3
dnl ------------------------
dnl libmpeg3 is used in one of the decoder implementations in the GAP
dnl Video API (GVA) as far as i know this lib is available only on
dnl UNIX systems dnl the current gimp-gap includes the libmpeg3-1.8
dnl as (unmaintained) sourcetree and calls the libmpeg3 configure
dnl script.  The generated Makefile will call the libmpeg3 original
dnl Makefile to build the library libmpeg3.a linking with gimp-gap
dnl modules is now done statically.
dnl
REQ_LIBMPEG3_VERSION="1.8"


dnl where to find the libmpeg3 sourcedir
LMPEG3_DIR="$extern_libs_dir/libmpeg3"
LIBMPEG3_TARBALL="$extern_libs_dir/libmpeg3.tar.gz"

AC_ARG_WITH(libmpeg3srcdir, [  --with-libmpeg3srcdir=DIR    specify where to find libmpeg3 src directory DIR  (this is a developers option to bypass the included libmpeg3 sourcetree)],
if eval "test x$with_libmpeg3srcdir != x"; then
  if eval "test x$with_libmpeg3srcdir != xyes"; then
    if test -d "$with_libmpeg3srcdir"; then
      LMPEG3_DIR=$with_libmpeg3srcdir
    else
      echo "** ERROR option --with-libmpeg3srcdir must refere to a directory"
      echo "** $with_libmpeg3srcdir  is not a directory"
    fi
  fi
fi)


dnl assume libmpeg3 build "no" (in case disabled or linked as prebuilt library)
build_libmpeg3_lib_yesno="no"
preinst_libmpeg3_specified="no"
vid_mpeg3_warning=""
libmpeg3_info_msg="
## gimp-gap is now configured without libmpeg3
   This is not critical, GIMP-GAP uses libmpeg3 in the video API 
   as additional video decoding engine for MPEG videos. 
   The main decoding engine based on ffmpeg also supports MPEG.
   libmpeg3 is limited to UNIX/LINUX operating systems.
   This gimp-gap release includes the sourcecode of libmpeg3
   (this is a duplicate of the original code libmpeg3-$REQ_LIBMPEG3_VERSION copied from: 
   http:/prdownloads.sourceforge.net/heroines/libmpeg3-1.8-src.tar.bz2
   old: http://www.heroinewarrior.com/download.php3)
   
"


libmpeg3_dependencies_ok="yes"

dnl check for pthread library (required for libmpeg3)
dnl the check result does not matter unless libmpeg3 is linked or built later on.
pthread_err=""
AC_CHECK_LIB(pthread, pthread_create,
	[AC_CHECK_HEADER(pthread.h,
          GAP_PTHREAD_LIB=" -lpthread",
          pthread_err="pthread header file (pthread.h) not found")],
	pthread_err="pthread library (libpthread) not found")

if test "x$pthread_err" != "x"; then
   libmpeg3_dependencies_ok="no"
fi


dnl check for the nasm assembler program (required for build of libmpeg3)
dnl the check result does not matter unless libmpeg3 is linked or built later on.
nasm_err=""
AC_CHECK_PROG(HAVE_NASM_ASSEMBLER, nasm, yes, no)
if test "x$HAVE_NASM_ASSEMBLER" = "xno"; then
   nasm_err=" the nasm assembler (required to build libmpeg3) was not found. nasm is available at nasm.sourceforge.net "
   libmpeg3_dependencies_ok="no"
fi





AC_ARG_ENABLE(libmpeg3,
              [  --disable-libmpeg3           don't build with libmpeg3])
AC_ARG_WITH(preinstalled-libmpeg3incdir, 
              [  --with-preinstalled-libmpeg3incdir=DIR    force link with an already installed libmpeg3 library and specify where to find libmpeg3 headerfiles])
AC_ARG_WITH(preinstalled-libmpeg3, 
              [  --with-preinstalled-libmpeg3=FILE         full pathname of the preinstalled libmpeg3.a libraryfile])

dnl
dnl checks for prebuilt libmpeg3
dnl usually installed at /usr/local/lib  or /usr/lib
dnl

if test "x$with_preinstalled_libmpeg3" != "x"; then
  preinst_libmpeg3_specified="yes"
  if test "x$pthread_err" != "x"; then
    enable_libmpeg3="no"
    vid_mpeg3_warning="
** WARNING: cant build with libmpeg3 (libmpeg3 depends on pthread library)
$pthread_err
$nasm_err
$libmpeg3_info_msg
"
  fi
  
  if test "x$enable_libmpeg3" != "xno"; then


    if test -f "$with_preinstalled_libmpeg3"; then
       GAP_VLIBS_MPEG3=" $with_preinstalled_libmpeg3"
       AC_DEFINE(ENABLE_GVA_LIBMPEG3, 1,
             [Define to 1 to enable compile and link with prebuilt libmpeg3])
    else
      vid_mpeg3_warning="$libmpeg3_info_msg
** ERROR option --with-preinstalled-libmpeg3 must refere to the file libmpeg3.a including full pathname.
   Maybe you should try to build libmpeg3 from the included sourcetree
   (dont specify --with-preinstalled-libmpeg3 in that case)
"
    fi
  fi
fi

if test "x$with_preinstalled_libmpeg3incdir" != "x"; then
  preinst_libmpeg3_err=""
  if test "x$preinst_libmpeg3_specified" != "xyes"; then
      vid_mpeg3_warning="$libmpeg3_info_msg
** ERROR option --with-preinstalled-libmpeg3incdir also requires the option --with-preinstalled-libmpeg3.
"
  
  fi;
  if test "x$enable_libmpeg3" != "xno"; then
    if test -f "$with_preinstalled_libmpeg3incdir/libmpeg3.h"; then
      if test -d "$with_preinstalled_libmpeg3incdir/audio"; then
	:
      else
	preinst_libmpeg3_err="$with_preinstalled_libmpeg3incdir has no subdirectory named audio"
      fi
      if test -d "$with_preinstalled_libmpeg3incdir/video"; then
	:
      else
	preinst_libmpeg3_err="$with_preinstalled_libmpeg3incdir has no subdirectory named video"
      fi
    else
      preinst_libmpeg3_err="file not found: $with_preinstalled_libmpeg3incdir/libmpeg3.h"
    fi
    
    if test "x$preinst_libmpeg3_err" != "x"; then
      vid_mpeg3_warning="$libmpeg3_info_msg
** ERROR option --with-preinstalled-libmpeg3incdir must refere to a directory with audio and video subdir.
** $preinst_libmpeg3_err
   Maybe you should try to build libmpeg3 from the included sourcetree
   (dont specify --with-preinstalled-libmpeg3incdir in that case)
"
    fi
    
    
    if test "x$vid_mpeg3_warning" != "x"; then
      GAP_VLIBS_MPEG3=" "
      GAP_VINCS_MPEG3=" "
      enable_libmpeg3="no"
    else
      LMPEG3_DIR="$with_preinstalled_libmpeg3incdir"
      GAP_VINCS_MPEG3=" -I$LMPEG3_DIR -I$LMPEG3_DIR/audio -I$LMPEG3_DIR/video "
    fi
  fi
fi



if test "x$preinst_libmpeg3_specified" != "xyes"; then

dnl  compile ability test is now disabled for libmpeg3
dnl     Note that this check once was introduced because old libmpeg3-1.5.4 did not compile
dnl     with recent gcc compiler versions.
dnl     libmpeg3-1.8 did compile fine on my openSuse 11.1 system
dnl       gcc (SUSE Linux) 4.3.2 [gcc-4_3-branch revision 141291]

dnl   if test "x$enable_libmpeg3" != "no"; then
dnl     dnl
dnl     dnl First of all check if the compiler is able to handle the libmpeg3
dnl     dnl code.
dnl     dnl
dnl 
dnl     AC_MSG_CHECKING([if libmpeg3 code can be compiled])
dnl     AC_COMPILE_IFELSE([
dnl int main(void) {
dnl   unsigned char *data;
dnl   *((unsigned short*)data)++ = 0x0;
dnl   return 0;
dnl }],, enable_libmpeg3=no)
dnl     AC_MSG_RESULT($enable_libmpeg3)
dnl 
dnl   fi


  if test "x$enable_libmpeg3" != "xno"; then
    dnl
    dnl the original tarball from http:www.heroinewarrior.com of
    dnl libmpeg3-1.8 comes without installation help for the library
    dnl and its headers.  but (some ?) LINUX distributors provide
    dnl installation rpm packages for libmpeg3
    dnl
    dnl some older libmpeg3-1.5 rpm packages (from my SuSE 8.2
    dnl distribution) are NOT compatible with the new API, and have
    dnl limited functions -- AC3 is turned off -- other packages (like
    dnl the current debian) disable CSS decryption.
    dnl
    dnl one solution to face those problems is to get the tarball with
    dnl the full sourcetree of the libmpeg3-1.8 library configure
    dnl and make the libmpeg3 from sourcetree and then link statically
    dnl by specifying the option --with-libmpeg3srcdir.
    dnl
    dnl libmpeg3 needs the assembler nasm to compile and checks this
    dnl requirement in its configuration script.
    dnl

    dnl check if old version off ffmpeg is already there 
    dnl (typically for already existing svn build after 1st svn update to new version)

    LIBMPEG3_PRIVATE_H="$LMPEG3_DIR/mpeg3private.h"

    if test -f "$LIBMPEG3_PRIVATE_H"; then
      if  grep '#define MPEG3_MAJOR   1' $LIBMPEG3_PRIVATE_H >/dev/null; then
        if  grep '#define MPEG3_MINOR   5' $LIBMPEG3_PRIVATE_H >/dev/null; then
         if  grep '#define MPEG3_RELEASE 4' $LIBMPEG3_PRIVATE_H >/dev/null; then
           mv "$LMPEG3_DIR" "$LMPEG3_DIR-OLD"
           echo "** UPDATE of libmpeg3 forced, moving $LMPEG3_DIR  to $LMPEG3_DIR-OLD"
           moved_old_libmpeg3_warn="
INFORMATION: old libmpeg3 was moved to  $LMPEG3_DIR-OLD
(you may delete the old libmpeg3 directory)
"
          fi
        fi
      fi
    fi



    if test "x$libmpeg3_dependencies_ok" != "xyes"; then
      enable_libmpeg3="no"
      vid_mpeg3_warning="
** WARNING: cant build with libmpeg3 (libmpeg3 depends on pthread library and the nasm assembler)
$pthread_err
$nasm_err
$libmpeg3_info_msg
"

    else
      machine_dependent_odir=`uname --machine`
      dnl
      if test -d "$LMPEG3_DIR"; then
	dnl
	echo "libmpeg3 sourcetree found at dir: $LMPEG3_DIR"
      else
	if test -f "$LIBMPEG3_TARBALL"; then
          cd "$extern_libs_dir"
	  echo "extracting tarball: $LIBMPEG3_TARBALL"
	  gzip -d -c "$LIBMPEG3_TARBALL" | tar -x
	  cd "$pwd_dir"
	else
          echo "** error LIBMPEG3 tarball not found, file: $LIBMPEG3_TARBALL"
	fi
      fi
      dnl
      if test -d "$LMPEG3_DIR"; then
	dnl
	echo "LIBMPEG3 sourcetree found at dir: $LMPEG3_DIR"
	dnl
	build_libmpeg3_lib_yesno="yes"
	LMPEG3_A="$LMPEG3_DIR/$machine_dependent_odir/libmpeg3.a"
	dnl
	GAP_VLIBS_MPEG3=" $LMPEG3_A "
	GAP_VINCS_MPEG3=" -I$LMPEG3_DIR -I$LMPEG3_DIR/audio -I$LMPEG3_DIR/video "
	AC_DEFINE(ENABLE_GVA_LIBMPEG3, 1,
             [Define to 1 to enable compile and link with libmpeg3])

	dnl read configure options for the external lib from a file      
	dnl the current simple implementation requires all options in one line
	LIBMPEG3_CONFIGURE_OPTIONS=`cat "$extern_libs_dir/configure_options_libmpeg3.txt"`

	echo "================================="
	echo "Calling LIBMPEG3 configure script options: $LIBMPEG3_CONFIGURE_OPTIONS"
	echo "================================="



	cd "$LMPEG3_DIR"
	./configure $LIBMPEG3_CONFIGURE_OPTIONS
	cd "$pwd_dir"

	echo "================================="
	echo "LIBMPEG3 configure script done options: $LIBMPEG3_CONFIGURE_OPTIONS"
	echo "================================="

	dnl
      else
	GAP_VLIBS_MPEG3=" "
	GAP_VINCS_MPEG3=" "
	vid_mpeg3_warning="
** ERROR: libmpeg3 source directory was not found at:
$LMPEG3_DIR

  this directory should be created automatically by extracting
  the tarball $LIBMPEG3_TARBALL

  if this tarball is not included in your gimp-gap distribution
  you can get the source tarball libmpeg3-$REQ_LIBMPEG3_VERSION at:
    http:/prdownloads.sourceforge.net/heroines/libmpeg3-1.8-src.tar.bz2
    old: http://www.heroinewarrior.com/download.php3
  
  The configure option --disable-libmpeg3 was activated due to this ERROR.
  (This reduces the number of supported videoformats for read access.
   access.)

"
      fi
    fi
  else
    if test "x$enable_videoapi_support" != "xno"; then
      vid_mpeg3_warning="$libmpeg3_info_msg $vid_mpeg3_warning"
      GAP_VLIBS_MPEG3=" "
      GAP_VINCS_MPEG3=" "
    fi
  fi
fi

AM_CONDITIONAL(ENABLE_GVA_LIBMPEG3_SUPPORT, test "x$enable_libmpeg3" != "xno")



dnl Test for XVID codec
dnl ------------------------
dnl the xvid codec lib is used in the AVI videoencoder plug-in for
dnl MPEG4 support xvid should compile on many operating systems,
dnl including UNIX and WINDOWS systems (ffmpeg has its own builtin
dnl MPEG4 codec implementation and does not depend on this codec)
dnl
AC_ARG_ENABLE(libxvidcore,
              [  --disable-libxvidcore        don't build with libxvidcore])
  if test "x$enable_libxvidcore" != "xno"; then
    dnl
    dnl check for libxvidcore
    dnl
    xvid_err=""
    AC_CHECK_LIB(xvidcore, xvid_encore,
      [AC_CHECK_HEADER(xvid.h,
        GAP_VLIBS_XVIDCORE=" -lxvidcore",
        xvid_err="xvid header file (xvid.h) not found")],
      xvid_err="xvid library (libxvidcore) not found")

    if test "x$xvid_err" = "x"; then
      AC_DEFINE(ENABLE_LIBXVIDCORE, 1,
                [Define to 1 to enable compile and link with libxvidcore])
      GAP_VLIBS_XVIDCORE=" -lxvidcore"
      dnl GAP_VINCS_XVIDCORE=" -I/usr/local/include"
    else
        vid_xvidcore_warning="
** WARNING: $xvid_err
   The AVI encoder plug-in is built without MPEG4 support.
   You can get the xvid codec at:  http://www.xvid.org/downloads.html
"
        GAP_VLIBS_XVIDCORE=" "
        GAP_VINCS_XVIDCORE=" "
    fi
  else
        vid_xvidcore_warning="
gimp-gap is configured without libxvidcore
   The AVI encoder plug-in is built without MPEG4 support.
   You can get the xvid codec at:  http://www.xvid.org/downloads.html
"
        GAP_VLIBS_XVIDCORE=" "
        GAP_VINCS_XVIDCORE=" "

  fi

AM_CONDITIONAL(ENABLE_LIBXVIDCORE_SUPPORT, test "x$enable_libxvidcore" != "xno")


AC_SUBST(GAP_VLIBS_FFMPEG)
AC_SUBST(GAP_VINCS_FFMPEG)
AC_SUBST(GAP_VLIBS_MPEG3)
AC_SUBST(GAP_VINCS_MPEG3)
AC_SUBST(GAP_PTHREAD_LIB)
AC_SUBST(GAP_VLIBS_XVIDCORE)
AC_SUBST(GAP_VINCS_XVIDCORE)

AC_SUBST(FFMPEG_DIR)
AC_SUBST(FFMPEG_LIBAVFORMAT_A)
AC_SUBST(FFMPEG_LIBAVCODEC_A)
AC_SUBST(FFMPEG_LIBAVUTIL_A)
AC_SUBST(LMPEG3_DIR)
AC_SUBST(LMPEG3_A)

GAPVIDEOAPI_EXTLIBS="\$(GAP_VLIBS_FFMPEG) \$(GAP_VLIBS_MPEG3) -lpng -lz \$(GAP_PTHREAD_LIB) -lm"
GAPVIDEOAPI_EXTINCS="\$(GAP_VINCS_FFMPEG) \$(GAP_VINCS_MPEG3)"
AC_SUBST(GAPVIDEOAPI_EXTLIBS)
AC_SUBST(GAPVIDEOAPI_EXTINCS)

dnl 
dnl TODO: check for required gthread version, 
dnl and disable GAP_USE_GTHREAD if not available
dnl
GTHREAD_LIBS="-lgthread-2.0"
AC_SUBST(GTHREAD_LIBS)



dnl Test for audiosupport
dnl audiosupport currently is based on wavplay that is available on UNIX systems
dnl (the wavplay client does not compile on Windows)
dnl ------------------------
AC_ARG_ENABLE(audio_support,
              [  --disable-audio-support      don't build with audio support])
  if test "x$os_win32" = "xyes"; then
     enable_audio_support=no
  fi

  if test "x$enable_audio_support" != "xno"; then
    AC_CHECK_PROG(WAVPLAY_SERVER, wavplay, yes, no)
      if test $WAVPLAY_SERVER = no; then
        audio_warning="
Audio support will be compiled in but will not work because the wavplay
executable was not found. For audio support the wavplay audioserver must
be installed at runtime.
"
      fi

    AC_DEFINE(GAP_ENABLE_AUDIO_SUPPORT, 1,
              [Define to 1 to enable audio support])
  fi

AM_CONDITIONAL(GAP_AUDIO_SUPPORT, test "x$enable_audio_support" != "xno")

dnl optional compile preview widget with GDK-pixbuf support
dnl 
AC_ARG_ENABLE(gdkpixbuf_pview,
              [  --enable-gdkpixbuf-pview     use GdkPixbuf thumbnail rendering (default=no)])
  if test "x$enable_gdkpixbuf_pview" = "xyes"; then
    AC_DEFINE(GAP_PVIEW_USE_GDK_PIXBUF_RENDERING, 1,
              [use Gdk for Pixbuf rendering in gap preview widget])
  fi



AM_CONDITIONAL(BUILD_FFMPEG_LIBS, test "x$build_ffmpeg_libs_yesno" != "xno")
AM_CONDITIONAL(BUILD_LIBMPEG3_LIB, test "x$build_libmpeg3_lib_yesno" != "xno")


GAPLIBDIR=${libdir}/$PACKAGE-$GAP_MAJOR_VERSION.$GAP_MINOR_VERSION



IT_PROG_INTLTOOL([0.35.0])
AM_GLIB_GNU_GETTEXT

LOCALEDIR='$(prefix)/$(DATADIRNAME)/locale'


dnl Use -Wall if we have gcc.
changequote(,)dnl
if test "x$GCC" = "xyes"; then
  case " $CFLAGS " in
  *[\ \	]-Wall[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -Wall" ;;
  esac

  case " $CFLAGS " in
  *[\ \	]-fPIC[\ \	]*) ;;
  *) CFLAGS="$CFLAGS -fPIC" ;;
  esac

fi
changequote([,])dnl


########################
# Disable deprecated API
########################

if ! $PKG_CONFIG --atleast-version=2.11.0 glib-2.0; then
  CPPFLAGS="${CPPFLAGS} -DG_DISABLE_DEPRECATED"
fi

if ! $PKG_CONFIG --atleast-version=2.9.0 gtk+-2.0; then
  CPPFLAGS="${CPPFLAGS} -DGDK_PIXBUF_DISABLE_DEPRECATED -DGDK_DISABLE_DEPRECATED -DGTK_DISABLE_DEPRECATED"
fi

if ! $PKG_CONFIG --atleast-version=1.13.0 pango; then
  CPPFLAGS="${CPPFLAGS} -DPANGO_DISABLE_DEPRECATED"
fi

if ! $PKG_CONFIG --atleast-version=2.7.0 gimp-2.0; then
  CPPFLAGS="${CPPFLAGS} -DGIMP_DISABLE_DEPRECATED"
fi


AC_SUBST(GAPLIBDIR)
AC_SUBST(LOCALEDIR)
AC_SUBST(BUILD_FFMPEG_LIBS)
AC_SUBST(BUILD_LIBMPEG3_LIB)

AC_OUTPUT([
Makefile
libgapbase/Makefile
extern_libs/Makefile
images/Makefile
gap/Makefile
libwavplayclient/Makefile
libgapvidapi/Makefile
libgapvidutil/Makefile
vid_common/Makefile
vid_enc_avi/Makefile
vid_enc_ffmpeg/Makefile
vid_enc_rawframes/Makefile
vid_enc_single/Makefile
po/Makefile.in
docs/Makefile
docs/howto/Makefile
docs/howto/txt/Makefile
docs/reference/Makefile
docs/reference/txt/Makefile
])

AC_MSG_RESULT($frontends_warning $audio_warning $videoapi_warning $moved_old_ffmpeg_warn $moved_old_libmpeg3_warn $vid_ffmpeg_warning $vid_mpeg3_warning $vid_quicktime_warning $vid_xvidcore_warning)