Fixes ticket #6124.

Fixes Ticket1536
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Program terminated with signal SIGSEGV, Segmentation fault.
  #0  0x0000000000aff8a4 in vaTerminate ()
  #1  0x0000000000ae50ce in vaapi_device_free (ctx=<optimized out>) at libavutil/hwcontext_vaapi.c:882
  #2  0x0000000000ae1f9e in hwdevice_ctx_free (opaque=<optimized out>, data=<optimized out>) at libavutil/hwcontext.c:66
  #3  0x0000000000ad856f in buffer_replace (src=0x0, dst=0x7fffa26ef1b8) at libavutil/buffer.c:119
  #4  av_buffer_unref (buf=buf@entry=0x7fffa26ef1f8) at libavutil/buffer.c:129
  #5  0x0000000000ae299f in av_hwdevice_ctx_create (pdevice_ref=0x170ac50 <hw_device_ctx>, type=type@entry=AV_HWDEVICE_TYPE_VAAPI, device=<optimized out>,
      opts=opts@entry=0x0, flags=flags@entry=0) at libavutil/hwcontext.c:494
  #6  0x0000000000400968 in vaapi_device_init (device=<optimized out>) at ffmpeg_vaapi.c:223
Signed-off-by: Mark Thompson <sw@jkqxz.net>

Fixes: 454/fuzz-3-ffmpeg_SUBTITLE_AV_CODEC_ID_MOV_TEXT_fuzzer

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

Implements support for height/width expressions in vf_scale_vaapi,
by refactoring common code into a new libavfilter/scale.c
Signed-off-by: Mark Thompson <sw@jkqxz.net>

Also disable ff_rv34_idct_dc_add_mmx on x86_64 as the presence of sse2
is guaranteed in such builds.
Signed-off-by: James Almer <jamrial@gmail.com>

Also disable ff_vp8_idct_dc_add_mmx on x86_64 as the presence of sse2
is guaranteed in such builds.
Signed-off-by: James Almer <jamrial@gmail.com>

Change the encoding of the original developer name from ISO-8859-1 to UTF-8.
Remove the stale/completed TODO list.
Fix two small typos.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Fixes out of array read
Fixes: 510/clusterfuzz-testcase-5737865715646464

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

* commit '9064777d':
  checkasm: add HEVC test for testing IDCT DC
Merged-by: Clément Bœsch <cboesch@gopro.com>

* commit '7f549b83':
  riff: don't overwrite bps from WAVEFORMATEX if EXTENSIBLE doesn't contain that data.

Only cosmetics, the change was already present.
Merged-by: Clément Bœsch <cboesch@gopro.com>

* commit '6135c3b6':
  Revert "avprobe: Zero the allocated avio buffer memory"

This commit is a noop, see 591cf8aaMerged-by: Clément Bœsch <cboesch@gopro.com>

* commit 'f637046d':
  libavutil: Always use some GCC style attributes on clang
Merged-by: Clément Bœsch <cboesch@gopro.com>

* commit '6f9e34ba':
  arm: Check for support for the .fpu directive
Merged-by: Clément Bœsch <cboesch@gopro.com>

* commit 'ed9b2a51':
  mov: Rework the check for invalid indexes in stsc

This commit is a noop, see 3c058f57.

The proposed fix breaks seeking in multiple_stsd.mp4 (ticket #3962) and
playback of wwwq_cut.mp4 (ticket #2991).
Merged-by: Matthieu Bouron <matthieu.bouron@gmail.com>

Certain alpha run lengths (for SHQ1/SHQ3/SHQ5) could be stored in
both long and short versions, and we would only accept the short version,
returning -1 (invalid code) for the others. This could cause an
out-of-bounds write on malicious input, as discovered by
Andreas Cadhalpun during fuzzing.

Fix by simply allowing both versions, leaving no invalid codes
in the alpha VLC.
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

For a pure video tile effect, and enabling better integration of playback windows
into other programs. It would improve the looks in many situations and avoid ugly
hacks like this: http://stackoverflow.com/q/31465630/315024Signed-off-by: Lucas Sandery <lucas-sandery@users.noreply.github.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

Improves u263_b-frames_5.avi
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

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

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

Multichannel joint stereo simply interleaves stereo pairs (6ch: 2ch + 2ch + 2ch), so each pair is decoded separatedly.

***

To test my changes, I converted examples to wav with ffmpeg.exe (old and new), and compared them to see they are byte-exact.

Regular 2ch files (JS and normal) were straightforward to test.

For multichannel, to check each JS pair is correctly decoded separatedly I did:
- manually demux 6ch.msf into 3 pairs and convert them (2ch_1.wav + 2ch_2.wav + 2ch_3.wav)
- convert the 6ch.msf file to wav (with my changes)
- manually demux the 6ch.wav into 3 pairs (6ch_d1.wav + 6ch_d2.wav + 6ch_d3.wav)
- compare each pair (ex. 2ch_3.wav vs 6ch_d3.wav): all pairs are byte-exact.

The new code just processes each JS pair separatedly, there are no algorithm changes.
It could be improved a bit but I'm not sure about typical styles.
I've only seen 6ch .MSF (probably the AT3 spec only supports 2ch audio).
Signed-off-by: bnnm <bananaman255@gmail.com>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Fixes: u263_b-frames_1.avi
Fixes part of Ticket1536

return -1 is used here as it is used in similar code in this function, I intend
to replace it by proper error codes in the whole function.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

* commit '90bc4232':
  mov: Wrap stsc index and count compare in a separate function

The mov_stsc_index_valid() function is replaced with a macro to prevent
signdness issues (index is not always signed, and count is always
unsigned currently).

The comparison is also adjusted to reduce the risk of overflows.
Merged-by: Clément Bœsch <u@pkh.me>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Retain the ranges of frame indexes when applying edit list in
mov_fix_index. The index ranges are then used to keep track of the frame
index of the current sample. In case of a discontinuity in frame indexes
due to edit, update the auxiliary info position accordingly.
Reviewed-by: Sasi Inguva <isasi@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

* commit '209ee680':
  mov: Fix stsc_count comparison

This commit is a noop, see 3c058f57Merged-by: Clément Bœsch <u@pkh.me>

Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>

* commit 'a1f6a2df':
  ratecontrol: Reorder functions to avoid forward declarations

Merged, but this seems to break the clear separation of 1-pass vs
2-pass.
Merged-by: Clément Bœsch <u@pkh.me>

* commit 'd639dcda':
  ratecontrol: Move Xvid-related functions to the place they are actually used
Merged-by: Clément Bœsch <u@pkh.me>

* commit '44972e22':
  ratecontrol: Move mpegenc-only function where it is used

This commit is a noop. ff_write_pass1_stats() is used in snowenc as
well.
Merged-by: Clément Bœsch <u@pkh.me>

Requested-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

The code relies on their validity and otherwise can try to access a NULL
object->rle pointer, causing segmentation faults.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

The assumption this is based on is wrong, the code is not always run with bitexact flags

This reverts commit a956164e, reversing
changes made to f6005907.
Approved-by: James Almer <jamrial@gmail.com>