DDS1 chunks are decoded in 2x2 blocks, odd chunk width or height is not
allowed in that case. Also ensure that the decode buffer is big enough
for all blocks being processed.
Bug-Id: CVE-2017-9992
CC: libav-stable@libav.org
It is not necessary to pad to the CTU size. The CB size of 8x8 should be
sufficient, but due to constraints in the Intel driver (the one usable
implementation of this) it has to be padded to 16x16 like in H.264.
This applies a specific fixup to some Bluray streams which contain
redundant PPSs modifying irrelevant parameters of the stream which
confuse other transformations which require correct extradata.
A new single global PPS is created, and all of the redundant PPSs
within the stream are removed.
The use of this SEI is for backward compatibility in HLG HDR systems:
older devices that cannot interpret the "arib-std-b67" transfer will
get the compatible transfer (usually bt709 or bt2020) from the VUI,
while newer devices that can interpret HDR will read the SEI and use
its value instead.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Use AVCodecContext.compression_level rather than a private option,
replacing the H.264-specific quality option (which stays only for
compatibility).
This now works with the H.265 encoder in the i965 driver, as well as
the existing cases with the H.264 encoder.
Add comments to describe the sources of the constraint values expressed here,
and add some more related values which will be used in following patches.
Fix the incorrect values for SPS and PPS count (they are not the same as those
used for H.264), and remove HEVC_MAX_CU_SIZE because it is not used anywhere.
Use the AVFrame.opaque_ref field. The original user's opaque_ref is
wrapped in the lavc struct and then unwrapped before the frame is
returned to the caller.
This new struct will be useful in the following commits.
Use the correct ctxIdxInc calculation for coded_block_flag.
Keep old behavior for old versions of x264 for backward compatibility.
CC: libav-stable@libav.org
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Do not use the one in the SEI directly as that is reset at certain
points.
Inspired by patches from Michael Niedermayer <michaelni@gmx.at> and
Anton Mitrofanov <BugMaster@narod.ru>.
CC: libav-stable@libav.org
This mode apparently does not support decoding of HEVC Main (8 bit).
With D3D11 and Intel drivers on Windows 10 I get green corruption, while
using DXVA2_ModeHEVC_VLD_Main works.
Signed-off-by: Anton Khirnov <anton@khirnov.net>
Otherwise the first decoded frame will still be tagged with the
original transfer instead of the alternative one.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Do not use skip_remaining() to fully wipe the cache, as this could do
a 64-bit shift of a 64-bit variable which is undefined behavior in C.
Instead set the related variables to zero directly.
Thanks to Uoti for pointing out the problem.
CC: libav-stable@libav.org
Avoid anonymously typedeffed structs and enums, drop an unused context member,
fix a small wording mishap, sizeof(type) ---> sizeof(*variable), drop a
needlessly verbose log message, use av_malloc_array() where appropriate.
Now it is possible to adjust compression speed vs R/D when needed
and also skip vintage player compatibility at will.
Signed-off-by: Diego Biurrun <diego@biurrun.de>
version 2013-02-08 Rl
- fixes/optimization in multistrip encoding and codebook size choice,
quality/bitrate is now better than that of the binary proprietary encoder
version 2013-02-12 Rl
- separated codebook training sets, avoided the transfer of wasted bytes,
which yields both better quality and smaller files
- now using the correct colorspace (TODO: move conversion to libswscale)
version 2013-02-14 Rl "Valentine's Day" version:
- made strip division more robust
- minimized bruteforcing the number of strips,
(costs some R/D but speeds up compession a lot), the heuristic
assumption is that score as a function of the number of strips has
one wide minimum which moves slowly, of course not fully true
- simplified codebook generation,
the old code was meant for other optimizations than we actually do
- optimized the codebook generation / error estimation for MODE_MC
version 2013-04-28 Rl
- bugfixed codebook optimization logic
version 2014-01-20 Rl
- made the encoder compatible with vintage decoders
and added some yet unused code for possible future
incremental codebook updates
- fixed a small memory leak
version 2014-01-21 Rl
- believe it or not, now we get even smaller files, with better quality
(which means I missed an optimization earlier :)
Signed-off-by: Diego Biurrun <diego@biurrun.de>
The use of this SEI is for backward compatibility in HLG HDR systems:
older devices that cannot interpret the "arib-std-b67" transfer will
get the compatible transfer (usually bt709 or bt2020) from the VUI,
while newer devices that can interpret HDR will read the SEI and use
its value instead.
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
