The padding data is assumed to be 0 in several places, notably in
subtitles. This problem was not detected with fate-sub-srt test because
the first element of the side data (x1) is 0 in the test, so the
trailing side data present in the packet wasn't read by the decoder. The
issue can be observed with a large enough x1.
It is also noted in FF_INPUT_BUFFER_PADDING_SIZE doxy that MPEG
bitstreams require that padding with 0, so it might fix other issues.
Refactoring copy_side_data into a separate function so that it can be called
in cases where side data needs to be duplicated.
Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Freeing it in av_destruct_packet(), as is done currently, would mean
that we allow it to be allocated with other means. But that would make
av_packet_new_side_data() unsafe.
Side data is not expected to be large, so copying it if required
shouldn't be a problem.
While we correctly "register" the side data when we split it,
the application (in this case FFmpeg) might not update the
AVPacket pool it uses to finally free the packet, thus
causing a leak.
This also makes the av_dup_packet unnecessary which could
cause an even worse leak in this situation.
Also change the code to not modify the user-provide AVPacket at all.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
p cannot be calculated before av_dup_packet since that one
might change avpkt->data, causing invalid reads and a
non-working range check.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Some code does call av_free_packet() on failed av_new_packets(), this
prevents the freeing of uninitialized pointers.
Originally committed as revision 20801 to svn://svn.ffmpeg.org/ffmpeg/trunk
AVPacket structure now resides also.
Patch by Thilo Borgmann thilo.borgmann googlemail com, see the mailinglist
thread "Google Summer of Code participation" for additional discussion.
Originally committed as revision 18353 to svn://svn.ffmpeg.org/ffmpeg/trunk
Michael Niedermayer
Luca Barbato
Diego Biurrun
Clément Bœsch
Vignesh Venkatasubramanian
Janne Grunau
Anton Khirnov
Andrey Utkin
Mans Rullgard
Martin Storsjö
Reimar Döffinger
Kostya Shishkov
Ramiro Polla
Thilo Borgmann