mgcp: Add RTP audio transcoding
This patch implements audio transcoding between the formats GSM,
PCMA, L16, and optionally G.729.
The feature needs to be enabled by using the autoconf option
'--enable-mgcp-transcoding'. In this case mgcp_transcode.c will
be compiled and linked to osmo-bsc_mgcp, and the transcoding
functions provided will be registered as processing callbacks.
If G.729 support is required, libcg729 needs to be installed and
'--with-g729' must be passed to ./configure.
Ticket: OW#1111
Sponsored-by: On-Waves ehf
diff --git a/openbsc/configure.ac b/openbsc/configure.ac
index 26a7b62..72f6e6a 100644
--- a/openbsc/configure.ac
+++ b/openbsc/configure.ac
@@ -57,6 +57,21 @@
AM_CONDITIONAL(BUILD_SMPP, test "x$osmo_ac_build_smpp" = "xyes")
AC_SUBST(osmo_ac_build_smpp)
+# Enable/disable transcoding within osmo-bsc_mgcp?
+AC_ARG_ENABLE([mgcp-transcoding], [AS_HELP_STRING([--enable-mgcp-transcoding], [Build the MGCP gateway with internal transcoding enabled.])],
+ [osmo_ac_mgcp_transcoding="$enableval"],[osmo_ac_mgcp_transcoding="no"])
+AC_ARG_WITH([g729], [AS_HELP_STRING([--with-g729], [Enable G.729 encoding/decoding.])], [osmo_ac_with_g729="$withval"],[osmo_ac_with_g729="no"])
+
+if test "$osmo_ac_mgcp_transcoding" = "yes" ; then
+ AC_SEARCH_LIBS(gsm_create, gsm)
+ if test "$osmo_ac_with_g729" = "yes" ; then
+ PKG_CHECK_MODULES(LIBBCG729, libbcg729 >= 0.1, [AC_DEFINE([HAVE_BCG729], [1], [Use bgc729 decoder/encoder])])
+ fi
+ AC_DEFINE(BUILD_MGCP_TRANSCODING, 1, [Define if we want to build the MGCP gateway with transcoding support])
+fi
+AM_CONDITIONAL(BUILD_MGCP_TRANSCODING, test "x$osmo_ac_mgcp_transcoding" = "xyes")
+AC_SUBST(osmo_ac_mgcp_transcoding)
+
found_libgtp=yes
PKG_CHECK_MODULES(LIBGTP, libgtp, , found_libgtp=no)