rtpdec: Emit timestamps for packets before the first RTCP packet, too

Emitted timestamps in each stream start from 0, for the first received
RTP packet. Once an RTCP packet is received, that one is used for
sync, emitting timestamps that fit seamlessly into the earlier ones.

Originally committed as revision 26187 to svn://svn.ffmpeg.org/ffmpeg/trunk

diff --git a/libavformat/rtpdec.c b/libavformat/rtpdec.c
index 77b59a3..7009249 100644 (file)
--- a/libavformat/rtpdec.c
+++ b/libavformat/rtpdec.c
@@ -123,9 +123,13 @@ static int rtcp_parse_packet(RTPDemuxContext *s, const unsigned char *buf, int l
             payload_len = (AV_RB16(buf + 2) + 1) * 4;
 
             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);
+            if (s->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
+                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;
+            }
 
             buf += payload_len;
             len -= payload_len;
@@ -440,8 +444,15 @@ static void finalize_packet(RTPDemuxContext *s, AVPacket *pkt, uint32_t timestam
         delta_timestamp = timestamp - s->last_rtcp_timestamp;
         /* convert to the PTS timebase */
         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 = s->range_start_offset + addend + delta_timestamp;
+        pkt->pts = s->range_start_offset + s->rtcp_ts_offset + addend +
+                   delta_timestamp;
+        return;
     }
+    if (timestamp == RTP_NOTS_VALUE)
+        return;
+    if (!s->base_timestamp)
+        s->base_timestamp = timestamp;
+    pkt->pts = s->range_start_offset + timestamp - s->base_timestamp;
 }
 
 static int rtp_parse_packet_internal(RTPDemuxContext *s, AVPacket *pkt,

diff --git a/libavformat/rtpdec.h b/libavformat/rtpdec.h
index 778ca92..c5a5217 100644 (file)
--- a/libavformat/rtpdec.h
+++ b/libavformat/rtpdec.h
@@ -172,6 +172,7 @@ struct RTPDemuxContext {
     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
+    int64_t rtcp_ts_offset;
 
     /* rtcp sender statistics */
     unsigned int packet_count;     // TODO: move into statistics (outgoing)

diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index 8c9d79c..ca84e5d 100644 (file)
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -1617,11 +1617,21 @@ int ff_rtsp_fetch_packet(AVFormatContext *s, AVPacket *pkt)
                  * in order to map their timestamp origin to the same ntp time
                  * as this one. */
                 int i;
+                AVStream *st = NULL;
+                if (rtsp_st->stream_index >= 0)
+                    st = s->streams[rtsp_st->stream_index];
                 for (i = 0; i < rt->nb_rtsp_streams; i++) {
                     RTPDemuxContext *rtpctx2 = rt->rtsp_streams[i]->transport_priv;
-                    if (rtpctx2 &&
-                        rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE)
+                    AVStream *st2 = NULL;
+                    if (rt->rtsp_streams[i]->stream_index >= 0)
+                        st2 = s->streams[rt->rtsp_streams[i]->stream_index];
+                    if (rtpctx2 && st && st2 &&
+                        rtpctx2->first_rtcp_ntp_time == AV_NOPTS_VALUE) {
                         rtpctx2->first_rtcp_ntp_time = rtpctx->first_rtcp_ntp_time;
+                        rtpctx2->rtcp_ts_offset = av_rescale_q(
+                            rtpctx->rtcp_ts_offset, st->time_base,
+                            st2->time_base);
+                    }
                 }
             }
             if (ret == -RTCP_BYE) {

diff --git a/libavformat/rtspdec.c b/libavformat/rtspdec.c
index 213f709..ad13b17 100644 (file)
--- a/libavformat/rtspdec.c
+++ b/libavformat/rtspdec.c
@@ -67,6 +67,8 @@ static int rtsp_read_play(AVFormatContext *s)
                 if (reply->range_start != AV_NOPTS_VALUE) {
                     rtpctx->last_rtcp_ntp_time  = AV_NOPTS_VALUE;
                     rtpctx->first_rtcp_ntp_time = AV_NOPTS_VALUE;
+                    rtpctx->base_timestamp      = 0;
+                    rtpctx->rtcp_ts_offset      = 0;
                     if (st)
                         rtpctx->range_start_offset =
                             av_rescale_q(reply->range_start, AV_TIME_BASE_Q,