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qtdemux: Parse ctts version

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Negative composition time offsets are only allowed with version 1 of the
box, however we parse it as a signed value also for version 0 boxes as
unfortunately there are such files out there and it's unlikely to have
(valid) huge composition offsets.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1294>
This commit is contained in:
Sebastian Dröge 2021-11-02 17:43:17 +02:00 committed by GStreamer Marge Bot
parent 284dd5443f
commit 767e8bf668
1 changed files with 8 additions and 3 deletions
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11
subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
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@ -9368,12 +9368,17 @@ qtdemux_stbl_init (GstQTDemux * qtdemux, QtDemuxStream * stream, GNode * stbl)
! !qtdemux_tree_get_child_by_type_full (stbl, FOURCC_ctts,
&stream->ctts) ? TRUE : FALSE) == TRUE) {
GstByteReader cslg = GST_BYTE_READER_INIT (NULL, 0);
guint8 ctts_version;
/* copy atom data into a new buffer for later use */
stream->ctts.data = g_memdup2 (stream->ctts.data, stream->ctts.size);
/* skip version + flags */
if (!gst_byte_reader_skip (&stream->ctts, 1 + 3)
/* version 1 has signed offsets */
if (!gst_byte_reader_get_uint8 (&stream->ctts, &ctts_version))
goto corrupt_file;
/* flags */
if (!gst_byte_reader_skip (&stream->ctts, 3)
|| !gst_byte_reader_get_uint32_be (&stream->ctts,
&stream->n_composition_times))
goto corrupt_file;
@ -9443,7 +9448,7 @@ qtdemux_stbl_init (GstQTDemux * qtdemux, QtDemuxStream * stream, GNode * stbl)
}
if (cslg_least < 0)
stream->cslg_shift = ABS (cslg_least);
stream->cslg_shift = -cslg_least;
else
stream->cslg_shift = 0;