# AS_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 AS_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(AS_AVIFILE, 
[
  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` -lstdc++
    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>

char*
my_strdup (char *str)
{
  char *new_str;
  
  if (str)
  {
    new_str = (char *) malloc ((strlen (str) + 1) * sizeof (char));
    strcpy (new_str, str);
  }
  else
    new_str = NULL;
  
  return new_str;
}

int
main ()
{
  int major, minor, micro;
  char *tmp_version;

  system ("touch conf.avifiletest");

  /* HP/UX 9 (%@#!) writes to sscanf strings */
  tmp_version = my_strdup ("$min_avifile_version");
  if (sscanf (tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) 
  {
    printf ("%s, bad version string\n", "$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="$XXCFLAGS $AVIFILE_CXXFLAGS" 
    LDFLAGS="$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)
      HAVE_AVIFILE="yes",
      AC_MSG_RESULT(failed)
      HAVE_AVIFILE="no",
    )
    AC_LANG_RESTORE
    CXXFLAGS="$ac_save_CXXFLAGS"
    LDFLAGS="$ac_save_LDFLAGS"
  fi
])