Make sure smoother only creates frames with offsets (bug #1029)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2184 65c4cc65-6c06-0410-ace0-fbb531ad65f3

frame.c

@@ -80,7 +80,7 @@ int ast_smoother_feed(struct ast_smoother *s, struct ast_frame *f)
 		ast_log(LOG_WARNING, "Out of smoother space\n");
 		return -1;
 	}
-	if ((f->datalen == s->size) && !s->opt) {
+	if ((f->datalen == s->size) && !s->opt && (f->offset >= AST_MIN_OFFSET)) {
 		if (!s->len) {
 			/* Optimize by sending the frame we just got
 			   on the next read, thus eliminating the douple

include/asterisk/frame.h

@@ -90,10 +90,10 @@ struct ast_frame_chain {
 };
 
 #define AST_FRIENDLY_OFFSET 	64		/*! It's polite for a a new frame to
-										   have at least this number of bytes
-										   of offset before your real frame data
-										   so that additional headers can be
-										   added. */
+						    				have this number of bytes for additional
+											headers.  */
+#define AST_MIN_OFFSET 		32		/*! Make sure we keep at least this much handy */
+
 /*! Need the header be free'd? */
 #define AST_MALLOCD_HDR		(1 << 0)
 /*! Need the data be free'd? */