dnl macros for X-related detections

dnl AC_SUBST's HAVE_X, X_CFLAGS, X_LIBS

AC_DEFUN([AG_GST_CHECK_X],

[

  AC_PATH_XTRA

  ac_cflags_save="$CFLAGS"

  ac_cppflags_save="$CPPFLAGS"

  CFLAGS="$CFLAGS $X_CFLAGS"

  CPPFLAGS="$CPPFLAGS $X_CFLAGS"

  dnl now try to find the HEADER

  HAVE_X="no"

  AC_CHECK_HEADER([X11/Xlib.h], [

    dnl and then the library with the most uniquitous function

    AC_CHECK_LIB(X11, [XSync], [HAVE_X="yes"], [], [$X_LIBS $X_PRE_LIBS $X_EXTRA_LIBS])

  ], [], [AC_INCLUDES_DEFAULT])

  if test "x$HAVE_X" = "xno"

  then

    AC_MSG_NOTICE([cannot find X11 development files])

  else

    dnl this is much more than we want

    X_LIBS="$X_LIBS $X_PRE_LIBS $X_EXTRA_LIBS"

    dnl AC_PATH_XTRA only defines the path needed to find the X libs,

    dnl it does not add the libs; therefore we add them here

    X_LIBS="$X_LIBS -lX11"

    AC_SUBST(X_CFLAGS)

    AC_SUBST(X_LIBS)

  fi

  AC_SUBST(HAVE_X)

  CFLAGS="$ac_cflags_save"

  CPPFLAGS="$ac_cppflags_save"

])

dnl *** XVideo ***

dnl Look for the PIC library first, Debian requires it.

dnl Check debian-devel archives for gory details.

dnl 20020110:

dnl At the moment XFree86 doesn't distribute shared libXv due

dnl to unstable API.  On many platforms you CAN NOT link a shared

dnl lib to a static non-PIC lib.  This is what the xvideo GStreamer

dnl plug-in wants to do.  So Debian distributes a PIC compiled

dnl version of the static lib for plug-ins to link to when it is

dnl inappropriate to link the main application to libXv directly.

dnl FIXME: add check if this platform can support linking to a

dnl        non-PIC libXv, if not then don not use Xv.

dnl FIXME: perhaps warn user if they have a shared libXv since

dnl        this is an error until XFree86 starts shipping one

AC_DEFUN([AG_GST_CHECK_XV],

[

  if test x$HAVE_X = xyes; then

    AC_CHECK_LIB(Xv_pic, XvQueryExtension,

                 HAVE_XVIDEO="yes", HAVE_XVIDEO="no",

                 $X_LIBS -lXext)

    if test x$HAVE_XVIDEO = xyes; then

      XVIDEO_LIBS="-lXv_pic -lXext"

      AC_SUBST(XVIDEO_LIBS)

    else

      dnl try again using something else if we didn't find it first

      if test x$HAVE_XVIDEO = xno; then

        AC_CHECK_LIB(Xv, XvQueryExtension,

                   HAVE_XVIDEO="yes", HAVE_XVIDEO="no",

                   $X_LIBS -lXext)

        if test x$HAVE_XVIDEO = xyes; then

          XVIDEO_LIBS="-lXv -lXext"

          AC_SUBST(XVIDEO_LIBS)

        fi

      fi

    fi

  fi

])