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rtsp: Use a random offset for trying to open UDP ports for RTP

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This avoids (for all practical cases) the issue of reusing
the same UDP port as for an earlier connection. If the remote
doesn't know the previous session was closed, he might keep
on sending packets to that port. If we always start off trying
to open the same UDP port, we might get those packets intermixed
with the new ones.

This is occasionally an issue when testing RTSP stuff with
DSS, perhaps also with other servers.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Dmitry Volyntsev 2012-01-18 13:46:37 +04:00 committed by Martin Storsjö
parent dbb06b8c0d
commit 58f0978581
1 changed files with 9 additions and 2 deletions
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11
libavformat/rtsp.c
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@ -1105,7 +1105,7 @@ int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
int lower_transport, const char *real_challenge)
{
RTSPState *rt = s->priv_data;
int rtx = 0, j, i, err, interleave = 0;
int rtx = 0, j, i, err, interleave = 0, port_off;
RTSPStream *rtsp_st;
RTSPMessageHeader reply1, *reply = &reply1;
char cmd[2048];
@ -1123,7 +1123,14 @@ int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
/* XXX: we assume the same server is used for the control of each
* RTSP stream */
for (j = rt->rtp_port_min, i = 0; i < rt->nb_rtsp_streams; ++i) {
/* Choose a random starting offset within the first half of the
* port range, to allow for a number of ports to try even if the offset
* happens to be at the end of the random range. */
port_off = av_get_random_seed() % ((rt->rtp_port_max - rt->rtp_port_min)/2);
/* even random offset */
port_off -= port_off & 0x01;
for (j = rt->rtp_port_min + port_off, i = 0; i < rt->nb_rtsp_streams; ++i) {
char transport[2048];
/*