dnl Perform a check for a GStreamer element using gst-inspect-x.y

dnl

dnl GST_ELEMENT_CHECK(ELEMENT-NAME, MIN-VERSION, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND)

dnl

dnl ELEMENT-NAME        : element factory name (mandatory)

dnl MIN-VERSION         : minimum version required, e.g. 1.0 or 1.0.5 (mandatory)

dnl ACTION-IF_FOUND     : action if element exists and is of the desired version

dnl ACTION-IF-NOT-FOUND : action if element does not exist or is too old

dnl

dnl gstapiversion=`echo $2 | tr '.' '\n' | head -n 2 | tr '\n' '.' | sed 's/\.$//'`

AC_DEFUN([GST_ELEMENT_CHECK],

[

  AC_REQUIRE([PKG_PROG_PKG_CONFIG])

  gstapiversion=`echo "$2" | while IFS=. read a b; do echo "$a.0"; done`

  gsttoolsdir=`$PKG_CONFIG --variable=toolsdir gstreamer-$gstapiversion`

  if test "x$gsttoolsdir" != "x"; then

    gstinspect="$gsttoolsdir/gst-inspect-$gstapiversion"

    AC_MSG_CHECKING(GStreamer $gstapiversion element $1 >= $2)

    if [ $gstinspect --exists --atleast-version=$2 $1 ]; then

      AC_MSG_RESULT([found])

      $3

    else

      if [ $gstinspect --exists $1 ]; then

        AC_MSG_RESULT([found, but too old])

      else

        AC_MSG_RESULT([not found])

      fi

      $4

    fi

  fi

])