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libavformat/rtpdec: fix issue with conversion from unsigned to signed

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When receiving an RTCP packet, the difference between the last RTCP
timestamp and the base timestamp may be negative. As these timestamps
are of the uint32_t type, the result becomes a large integer. Cast
the difference to int32_t to avoid this issue.

The result of this issue is very large start times for RTSP
streams, and difficulty to restart correctly after a pause.

Signed-off-by: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Gilles Chanteperdrix 2015-02-20 07:14:53 +01:00 committed by Michael Niedermayer
parent e3cc93aacf
commit 73029abddc
1 changed files with 1 additions and 1 deletions
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2
libavformat/rtpdec.c
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@ -161,7 +161,7 @@ static int rtcp_parse_packet(RTPDemuxContext *s, const unsigned char *buf,
s->first_rtcp_ntp_time = s->last_rtcp_ntp_time;
if (!s->base_timestamp)
s->base_timestamp = s->last_rtcp_timestamp;
s->rtcp_ts_offset = s->last_rtcp_timestamp - s->base_timestamp;
s->rtcp_ts_offset = (int32_t)(s->last_rtcp_timestamp - s->base_timestamp);
}
break;