echo-cancel: orc-ify some bits for optimisation

This uses Orc to optimise an inner loop in the core NLMS function of the
Adrian echo canceller.

1 files changed, 56 insertions, 0 deletions

diff --git a/m4/orc.m4 b/m4/orc.m4
new file mode 100644
index 00000000..92bf21e9
--- /dev/null
+++ b/m4/orc.m4
@@ -0,0 +1,56 @@
+dnl pkg-config-based checks for Orc
+
+dnl specific:
+dnl ORC_CHECK([REQUIRED_VERSION])
+
+AC_DEFUN([ORC_CHECK],
+[
+  ORC_REQ=ifelse([$1], , "0.4.5", [$1])
+
+  AC_ARG_ENABLE(orc,
+  AC_HELP_STRING([--enable-orc],[use Orc if installed]),
+  [case "${enableval}" in
+    auto) enable_orc=auto ;;
+    yes) enable_orc=yes ;;
+    no)  enable_orc=no ;;
+    *) AC_MSG_ERROR(bad value ${enableval} for --enable-orc) ;;
+  esac
+  ],
+  [enable_orc=auto]) dnl Default value
+
+  if test "x$enable_orc" != "xno" ; then
+    PKG_CHECK_MODULES(ORC, orc-0.4 >= $ORC_REQ, [
+      AC_DEFINE(HAVE_ORC, 1, [Use Orc])
+      ORCC=`$PKG_CONFIG --variable=orcc orc-0.4`
+      AC_SUBST(ORCC)
+      HAVE_ORC=yes
+    ], [
+      if test "x$enable_orc" = "xyes" ; then
+        AC_MSG_ERROR([--enable-orc specified, but Orc >= $ORC_REQ not found])
+      fi
+      AC_DEFINE(DISABLE_ORC, 1, [Disable Orc])
+      HAVE_ORC=no
+    ])
+  else
+    AC_DEFINE(DISABLE_ORC, 1, [Disable Orc])
+    HAVE_ORC=no
+  fi
+  AM_CONDITIONAL(HAVE_ORC, test "x$HAVE_ORC" = "xyes")
+
+]))
+
+AC_DEFUN([ORC_OUTPUT],
+[
+  if test "$HAVE_ORC" = yes ; then
+    printf "configure: *** Orc acceleration enabled.\n"
+  else
+    if test "x$enable_orc" = "xno" ; then
+      printf "configure: *** Orc acceleration disabled by --disable-orc.  Slower code paths\n"
+      printf "               will be used.\n"
+    else
+      printf "configure: *** Orc acceleration disabled.  Requires Orc >= $ORC_REQ, which was\n"
+      printf "               not found.  Slower code paths will be used.\n"
+    fi
+  fi
+  printf "\n"
+])