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mpegtsdemux: Protect bitrate estimation against bogus values.

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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
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21
gst/mpegdemux/gstmpegtsdemux.c
View file

@ -2355,14 +2355,27 @@ gst_mpegts_demux_parse_transport_packet (GstMpegTSDemux * demux,
MPEGTS_NORMAL_TS_PACKETSIZE - 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->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,
MPEGTIME_TO_GSTTIME (demux->pcr[1] - demux->pcr[0]));
GST_DEBUG_OBJECT (demux, "bitrate is %" G_GINT64_FORMAT
" bytes per second", demux->bitrate);
/* somehow... I doubt a bitrate below one packet per second is valid */
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++;
return ret;

2
gst/mpegdemux/gstmpegtsdemux.h
View file

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