Added WAVE writer and resample port, and also found out why audio quality is poor with DirectSound

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@358 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjmedia/include/pjmedia.h b/pjmedia/include/pjmedia.h
index 8cdc0b7..34264b6 100644
--- a/pjmedia/include/pjmedia.h
+++ b/pjmedia/include/pjmedia.h
@@ -34,6 +34,7 @@
 #include <pjmedia/jbuf.h>
 #include <pjmedia/null_port.h>
 #include <pjmedia/port.h>
+#include <pjmedia/resample.h>
 #include <pjmedia/rtcp.h>
 #include <pjmedia/rtp.h>
 #include <pjmedia/sdp.h>