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-rw-r--r--rtp.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/rtp.c b/rtp.c
index d0d84453d..208e58287 100644
--- a/rtp.c
+++ b/rtp.c
@@ -93,6 +93,7 @@ struct ast_rtp {
struct ast_frame f;
unsigned char rawdata[8192 + AST_FRIENDLY_OFFSET];
unsigned int ssrc; /*!< Synchronization source, RFC 3550, page 10. */
+ unsigned int rxssrc;
unsigned int lastts;
unsigned int lastdigitts;
unsigned int lastrxts;
@@ -430,6 +431,7 @@ struct ast_frame *ast_rtp_read(struct ast_rtp *rtp)
int ext;
int x;
char iabuf[INET_ADDRSTRLEN];
+ unsigned int ssrc;
unsigned int timestamp;
unsigned int *rtpheader;
struct rtpPayloadType rtpPT;
@@ -485,6 +487,14 @@ struct ast_frame *ast_rtp_read(struct ast_rtp *rtp)
ext = seqno & (1 << 28);
seqno &= 0xffff;
timestamp = ntohl(rtpheader[1]);
+ ssrc = ntohl(rtpheader[2]);
+
+ if (!mark && rtp->rxssrc && rtp->rxssrc != ssrc) {
+ ast_log(LOG_WARNING, "Forcing Marker bit, because SSRC has changed\n");
+ mark = 1;
+ }
+
+ rtp->rxssrc = ssrc;
if (padding) {
/* Remove padding bytes */