mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-25 17:50:36 +00:00
Code Issues 1 Projects Releases Wiki Activity

mpegtsdemux: Protect bitrate estimation against bogus values.

Browse source 
If the estimated bitrate is lower than 188 bytes, there's most likely
something completely wrong with the two samples. If that happens,
force recalculation.

Use guint64 for observation PCR, I saw cases where it would overflow.
This commit is contained in:
Edward Hervey 2009-05-11 16:59:20 +02:00
parent bc062b9acf
commit f9dfc44a67
2 changed files with 18 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
gst/mpegdemux/gstmpegtsdemux.c
View file

@ -2355,14 +2355,27 @@ gst_mpegts_demux_parse_transport_packet (GstMpegTSDemux * demux,
MPEGTS_NORMAL_TS_PACKETSIZE - 1); MPEGTS_NORMAL_TS_PACKETSIZE - 1);
if (demux->pcr[1] != -1 && demux->bitrate == -1) { if (demux->pcr[1] != -1 && demux->bitrate == -1) {
GST_DEBUG_OBJECT (demux, "stream->last_PCR_difference: %" G_GINT64_FORMAT guint64 bitrate;
GST_DEBUG_OBJECT (demux, "pcr[0]:%" G_GUINT64_FORMAT, demux->pcr[0]);
GST_DEBUG_OBJECT (demux, "pcr[1]:%" G_GUINT64_FORMAT, demux->pcr[1]);
GST_DEBUG_OBJECT (demux, "diff in time %" GST_TIME_FORMAT,
GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (demux->pcr[1] - demux->pcr[0])));
GST_DEBUG_OBJECT (demux, "stream->last_PCR_difference: %" G_GUINT64_FORMAT
", demux->num_packets %" G_GUINT64_FORMAT, ", demux->num_packets %" G_GUINT64_FORMAT,
demux->pcr[1] - demux->pcr[0], demux->num_packets); demux->pcr[1] - demux->pcr[0], demux->num_packets);
demux->bitrate = gst_util_uint64_scale (GST_SECOND, bitrate = gst_util_uint64_scale (GST_SECOND,
MPEGTS_NORMAL_TS_PACKETSIZE * demux->num_packets, MPEGTS_NORMAL_TS_PACKETSIZE * demux->num_packets,
MPEGTIME_TO_GSTTIME (demux->pcr[1] - demux->pcr[0])); MPEGTIME_TO_GSTTIME (demux->pcr[1] - demux->pcr[0]));
GST_DEBUG_OBJECT (demux, "bitrate is %" G_GINT64_FORMAT /* somehow... I doubt a bitrate below one packet per second is valid */
" bytes per second", demux->bitrate); if (bitrate > MPEGTS_NORMAL_TS_PACKETSIZE - 1) {
demux->bitrate = bitrate;
GST_DEBUG_OBJECT (demux, "bitrate is %" G_GINT64_FORMAT
" bytes per second", demux->bitrate);
} else {
GST_WARNING_OBJECT (demux, "Couldn't compute valid bitrate, recomputing");
demux->pcr[0] = demux->pcr[1] = -1;
demux->num_packets = -1;
}
} }
demux->num_packets++; demux->num_packets++;
return ret; return ret;

2
gst/mpegdemux/gstmpegtsdemux.h
View file

@ -213,7 +213,7 @@ struct _GstMpegTSDemux {
gint64 bitrate; gint64 bitrate;
/* Two PCRs observations to calculate bitrate */ /* Two PCRs observations to calculate bitrate */
gint64 pcr[2]; guint64 pcr[2];
/* Cached duration estimation */ /* Cached duration estimation */
GstClockTime cache_duration; GstClockTime cache_duration;