# AM_PATH_AVIFILE 0.1.0
# CXXFLAGS and LIBS for avifile
# taken from Autostar Sandbox, http://autostars.sourceforge.net/
# constructed by careful cross-pollination from various sources and lots of
# hard labour

dnl Usage:
dnl AM_PATH_AVIFILE(MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl Test for avifile, and defines
dnl - AVIFILE_CXXFLAGS (C++ compiler flags)
dnl - AVIFILE_LDFLAGS (linker flags, stripping and path)
dnl as well as set HAVE_AVIFILE to yes or no
dnl
dnl FIXME: should define AVIFILE_VERSION
dnl
dnl prerequisites:
dnl - working C++ compiler
dnl - usable libstdc++
dnl - AC_PATH_XTRA

AC_DEFUN([AM_PATH_AVIFILE],
[
    AC_REQUIRE([AC_PROG_CXX])
    AC_REQUIRE([AC_PATH_XTRA])
    HAVE_AVIFILE=no

    dnl first look for avifile-config
    AC_PATH_PROG(AVIFILE_CONFIG, avifile-config, no)
    min_avifile_version=ifelse([$1], ,0.7.0, $1)
    if test "x$AVIFILE_CONFIG" != "xno"; then
	dnl now that we have it, we need to save libs and cflags
	AVIFILE_LDFLAGS=`avifile-config --libs`
	AVIFILE_CXXFLAGS=`avifile-config --cflags`
	AC_SUBST(AVIFILE_LDFLAGS)
	AC_SUBST(AVIFILE_CXXFLAGS)
	HAVE_AVIFILE=yes
    fi

    dnl we got this far, now start checking if we have the right version
    if test x$HAVE_AVIFILE = xyes ; then
	AC_MSG_CHECKING(for avifile - version >= $min_avifile_version)
	dnl first get the version number from avifile-config
	avifile_major_version=`$AVIFILE_CONFIG $avifile_args --version | \
	     sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
	avifile_minor_version=`$AVIFILE_CONFIG $avifile_args --version | \
	     sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
	avifile_micro_version=`$AVIFILE_CONFIG $avifile_config_args --version | \
	     sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`

	dnl now run a short C app that tells us if the version is ok or not
	dnl all of this is boilerplate code from other examples
	rm -f conf.avifiletest
	AC_TRY_RUN([
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int
main ()
{
  int major, minor, micro;
  char ver[50];

  system ("touch conf.avifiletest");

  /* HP/UX 9 (%@#!) writes to sscanf strings */
  strncpy(ver, "$min_avifile_version", sizeof(ver) - 1);
  if (sscanf(ver, "%d.%d.%d", &major, &minor, &micro) != 3)
  {
    printf ("%s, bad version string\n", "$min_avifile_version");
    exit (1);
  }
  if (($avifile_major_version > major) ||
     (($avifile_major_version == major) && ($avifile_minor_version > minor)) ||
     (($avifile_major_version == major) && ($avifile_minor_version == minor) && ($avifile_micro_version >= micro)))
    return 0;
  else
  {
    printf ("\n*** 'avifile-config --version' returned %d.%d.%d, but the minimum version\n", $avifile_major_version, $avifile_minor_version, $avifile_micro_version);
    printf ("*** of AVIFILE required is %d.%d.%d. If avifile-config is correct, then it is\n", major, minor, micro);
    printf ("*** best to upgrade to the required version.\n");
    printf ("*** If avifile-config was wrong, set the environment variable AVIFILE_CONFIG\n");
    printf ("*** to point to the correct copy of avifile-config, and remove the file\n");
    printf ("*** config.cache (if it exists) before re-running configure\n");
    return 1;
  }
}
    ],
    [
	AC_MSG_RESULT(yes)
	HAVE_AVIFILE=yes
    ],
    [
        HAVE_AVIFILE=no
    ])
    fi

    if test x$HAVE_AVIFILE = xyes ; then
	dnl now try to compile a sample test app

	dnl first save whatever language we're currently testing in
	dnl AC_LANG_SAVE
	dnl AC_LANG_CPLUSPLUS
	AC_LANG_PUSH(C++)
	ac_save_CXXFLAGS=$CXXFLAGS
	ac_save_LDFLAGS=$LDFLAGS
	dnl add X flags, because it looks like avifile needs libXv and libXxf86vm
	CXXFLAGS="$CXXFLAGS $AVIFILE_CXXFLAGS"
	LDFLAGS="$LDFLAGS $AVIFILE_LDFLAGS $X_LIBS -lXv -lXxf86vm"

	AC_MSG_CHECKING(compilation of avifile test program)
	dnl try the compile
	AC_TRY_LINK([
#include <stdio.h>
#include <stdlib.h>
#include <avifile.h>
#include <creators.h>
	], [
/* function body */
IVideoDecoder *decoder;
BITMAPINFOHEADER bh;

decoder = Creators::CreateVideoDecoder(bh) ],
	[ AC_MSG_RESULT(succeeded) ],
	[ AC_MSG_RESULT(failed) ; HAVE_AVIFILE=no ] )
	AC_LANG_RESTORE
	CXXFLAGS="$ac_save_CXXFLAGS"
	LDFLAGS="$ac_save_LDFLAGS"
    fi
])