mgcp: Add CLI tool to test audio conversion

This tool uses mgcp_transcode.c to convert audio data from stdin to
stdout.

Sponsored-by: On-Waves ehf
diff --git a/openbsc/contrib/testconv/Makefile b/openbsc/contrib/testconv/Makefile
new file mode 100644
index 0000000..90adecc
--- /dev/null
+++ b/openbsc/contrib/testconv/Makefile
@@ -0,0 +1,17 @@
+
+OBJS = testconv_main.o mgcp_transcode.o
+
+CC = gcc
+CFLAGS = -O0 -ggdb -Wall
+LDFLAGS =
+CPPFLAGS = -I../.. -I../../include $(shell pkg-config --cflags libosmocore) $(shell pkg-config --cflags libbcg729)
+LIBS =  ../../src/libmgcp/libmgcp.a ../../src/libcommon/libcommon.a $(shell pkg-config --libs libosmocore) $(shell pkg-config --libs libbcg729) -lgsm -lrt
+
+testconv: $(OBJS)
+	$(CC)  -o $@ $^ $(LDFLAGS) $(LIBS)
+
+testconv_main.o: testconv_main.c
+mgcp_transcode.o: ../../src/osmo-bsc_mgcp/mgcp_transcode.c
+
+$(OBJS):
+	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<