This prevents redundant position computation and make the code faster
(1.1x faster overall).

This value can not be negative.

This doesn't seem to make much of a difference but it can't hurt.

This helps figuring out where the filter is slow:

  70.53%  ffmpeg_g  ffmpeg_g          [.] nlmeans_slice
  25.73%  ffmpeg_g  ffmpeg_g          [.] compute_safe_ssd_integral_image_c
   1.74%  ffmpeg_g  ffmpeg_g          [.] compute_unsafe_ssd_integral_image
   0.82%  ffmpeg_g  ffmpeg_g          [.] ff_mjpeg_decode_sos
   0.51%  ffmpeg_g  [unknown]         [k] 0xffffffff91800a80
   0.24%  ffmpeg_g  ffmpeg_g          [.] weight_averages

(Tested with a large image that takes several seconds to process)

Since this function is irrelevant speed wise, the file's TODO is
updated.

Overall speed appears to be 1.1x faster with no noticeable quality
impact.

before:  ssd_integral_image_c: 49204.6
after:   ssd_integral_image_c: 44272.8

Unrolling by 4 made the biggest difference on odroid-c2 (aarch64);
unrolling by 2 or 8 both raised 46k cycles vs 44k for 4.

Additionally, this is a much better reference when writing SIMD (SIMD
vectorization will just target 16 instead of 4).

ssd_integral_image_c: 49204.6
ssd_integral_image_neon: 28346.8

Similarly to previous commit, this will help writing SIMD code by not
having manual zero-extension in SIMD code

SIMD code will not have to deal with padding itself. Overwriting in that
function may have been possible but involve large overreading of the
sources. Instead, we simply make sure the width to process is always a
multiple of 16. Additionally, there must be some actual area to process
so the SIMD code can have its boundary checks after processing the first
pixels.

This makes nlmeans_slice() slightly faster at least on GCC 7.3.

As per
https://web.archive.org/web/20020803104640/http://www.pcisys.net:80/~melanson/codecs/film-format.txt,

the top bit of the info1 chunk is set as 1 for inter-coded frames and 0
otherwise.

Removes an unneeded copy and does the 5-point permute in-place.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

Saves 1 gpr and 2 instructions and simplifies the macros a bit.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

The structure has reserved bytes, it is required to set the reserved
bytes to 0 for future use.
Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>

Otherwise it will hit an assert in the function
ff_cbs_trace_syntax_element() in cbs.c, line 400.
Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>

Option "4x(MFX_LOOKAHEAD_DS_4x)" is provided but can't be set due to
wrong maximum value.
Signed-off-by: Zhong Li <zhong.li@intel.com>

Signed-off-by: James Almer <jamrial@gmail.com>

The access dependecy is temporary and should fix compilation with
msvc until a proper fix is committed.
Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: Marton Balint <cus@passwd.hu>

Most decoders (pgssubdec, ccaption_dec) are using -1 or UINT32_MAX for a
subtitle event which should be cleared at the next event.
Signed-off-by: Marton Balint <cus@passwd.hu>

Fixes: shift exponent 47 is too large for 32-bit type 'int'
Fixes: 7955/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-6016721977606144

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>

Fixes: assertion failure
Fixes: 7949/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-4819602782552064

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>

This is large enough for all jpeg2000 files i tested. If some need more then this
should be changed to dynamic allocation. Dynamic allocation would need to be done
carefully as these are many relatively small arrays so repeatly reallocating them
would not be good.
The decrease is a clean and simple solution assuming it works for all files.

Fixes: OOM
Fixes: 6534/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-4821490731057152

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>

Fixes: signed integer overflow: 65280 * 196032 cannot be represented in type 'int'
Fixes: 7279/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G2M_fuzzer-5977332473921536

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>

It exists, so why not use it? Helps one get rid of additional
search path related flags in addition to PKG_CONFIG_{PATH,LIBDIR}
when utilizing a cross-prefix separate from the sysroot.

Yet another case of forgotten 0 =! EOF translation. The libbluray
documentation specifically mentions that a read of 0 is EOF.

Reported by Fyr on IRC.

Remove the dead code in av_probe_input_buffer2
Signed-off-by: Jun Zhao <mypopydev@gmail.com>

remove the "ret" to make the code simple and generic.
Signed-off-by: Jun Zhao <mypopydev@gmail.com>

Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Forgotten with the commit which removed support for libxvid_rc.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>