diff options
Diffstat (limited to 'libavformat/rtsp.c')
| -rw-r--r-- | libavformat/rtsp.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c index 0e56d37a1f..487e910c17 100644 --- a/libavformat/rtsp.c +++ b/libavformat/rtsp.c @@ -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]; /* |