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Revert svn rev 21857, readd first_rtcp_ntp_time in RTPDemuxContext

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In order to sync RTP streams that get their initial RTCP timestamp at
different times, propagate the NTP timestamp of the first RTCP packet
to all other streams.

This makes the timestamps of returned packets start at (near) zero instead
of at any random offset.

Originally committed as revision 22917 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Martin Storsjö 2010-04-20 07:34:28 +00:00
parent 2293a2e67f
commit 2cab6b48ad
3 changed files with 25 additions and 2 deletions
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5
libavformat/rtpdec.c
View File

@ -80,6 +80,8 @@ static int rtcp_parse_packet(RTPDemuxContext *s, const unsigned char *buf, int l
if (buf[1] != 200)
return -1;
s->last_rtcp_ntp_time = AV_RB64(buf + 8);
if (s->first_rtcp_ntp_time == AV_NOPTS_VALUE)
s->first_rtcp_ntp_time = s->last_rtcp_ntp_time;
s->last_rtcp_timestamp = AV_RB32(buf + 16);
return 0;
}
@ -326,6 +328,7 @@ RTPDemuxContext *rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *r
return NULL;
s->payload_type = payload_type;
s->last_rtcp_ntp_time = AV_NOPTS_VALUE;
s->first_rtcp_ntp_time = AV_NOPTS_VALUE;
s->ic = s1;
s->st = st;
s->rtp_payload_data = rtp_payload_data;
@ -433,7 +436,7 @@ static void finalize_packet(RTPDemuxContext *s, AVPacket *pkt, uint32_t timestam
/* compute pts from timestamp with received ntp_time */
delta_timestamp = timestamp - s->last_rtcp_timestamp;
/* convert to the PTS timebase */
addend = av_rescale(s->last_rtcp_ntp_time, s->st->time_base.den, (uint64_t)s->st->time_base.num << 32);
addend = av_rescale(s->last_rtcp_ntp_time - s->first_rtcp_ntp_time, s->st->time_base.den, (uint64_t)s->st->time_base.num << 32);
pkt->pts = addend + delta_timestamp;
}
}

1
libavformat/rtpdec.h
View File

@ -174,6 +174,7 @@ struct RTPDemuxContext {
/* rtcp sender statistics receive */
int64_t last_rtcp_ntp_time; // TODO: move into statistics
int64_t first_rtcp_ntp_time; // TODO: move into statistics
uint32_t last_rtcp_timestamp; // TODO: move into statistics
/* rtcp sender statistics */

21
libavformat/rtsp.c
View File

@ -1796,8 +1796,27 @@ static int rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
return AVERROR_EOF;
if (rt->transport == RTSP_TRANSPORT_RDT) {
ret = ff_rdt_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
} else
} else {
ret = rtp_parse_packet(rtsp_st->transport_priv, pkt, buf, len);
if (ret < 0) {
/* Either bad packet, or a RTCP packet. Check if the
* first_rtcp_ntp_time field was initialized. */
RTPDemuxContext *rtpctx = rtsp_st->transport_priv;
if (rtpctx->first_rtcp_ntp_time != AV_NOPTS_VALUE) {
/* first_rtcp_ntp_time has been initialized for this stream,
* copy the same value to all other uninitialized streams,
* in order to map their timestamp origin to the same ntp time
* as this one. */
int i;
for (i = 0; i < rt->nb_rtsp_streams; i++) {
RTPDemuxContext *rtpctx2 = rtsp_st->transport_priv;
if (rtpctx2 &&
rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE)
rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
}
}
}
}
if (ret < 0)
goto redo;
if (ret == 1)