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qtdemux: Ignore corrupted CTTS box

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If ctts (CompositionOffsetBox) has larger sample_offset
(offset between PTS and DTS) than (2 * duration) of the stream,
assume the ctts box to be corrupted and ignore the box.

https://bugzilla.gnome.org/show_bug.cgi?id=797262
This commit is contained in:
Seungha Yang 2018-11-01 20:37:12 +09:00 committed by Sebastian Dröge
parent a03d29420b
commit 5d542030db
1 changed files with 12 additions and 0 deletions
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12
gst/isomp4/qtdemux.c
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@ -8999,6 +8999,18 @@ qtdemux_stbl_init (GstQTDemux * qtdemux, QtDemuxStream * stream, GNode * stbl)
gst_byte_reader_skip_unchecked (&stream->ctts, 4);
offset = gst_byte_reader_get_int32_be_unchecked (&stream->ctts);
/* HACK: if sample_offset is larger than 2 * duration, ignore the box.
* slightly inaccurate PTS could be more usable than corrupted one */
if (G_UNLIKELY ((ABS (offset) / 2) > stream->duration)) {
GST_WARNING_OBJECT (qtdemux,
"Ignore corrupted ctts, sample_offset %" G_GINT32_FORMAT
" larger than duration %" G_GUINT64_FORMAT,
offset, stream->duration);
stream->cslg_shift = 0;
stream->ctts_present = FALSE;
return TRUE;
}
if (offset < cslg_least)
cslg_least = offset;