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h265parser: Fix NAL size check for identification

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Unlike H264, H265 requires 2 bytes after the start code to allow NAL
identification. This would otherwise report a broken NAL and skip
important data.

Fixes #1287

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1251>
This commit is contained in:
Nicolas Dufresne 2020-05-06 22:18:12 -04:00
parent 4332dc195d
commit 9029631f75
1 changed files with 7 additions and 0 deletions
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7
gst-libs/gst/codecparsers/gsth265parser.c
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@ -1414,6 +1414,13 @@ gst_h265_parser_identify_nalu_unchecked (GstH265Parser * parser,
nalu->sc_offset = offset + off1;
/* The scanner ensures one byte passed the start code but to
* identify an HEVC NAL, we need 2. */
if (size - nalu->sc_offset - 3 < 2) {
GST_DEBUG ("Not enough bytes after start code to identify");
return GST_H265_PARSER_NO_NAL;
}
/* sc might have 2 or 3 0-bytes */
if (nalu->sc_offset > 0 && data[nalu->sc_offset - 1] == 00)
nalu->sc_offset--;