See also https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80208

This conflict with the DJGPP libc math.h which includes a PI macro (to
M_PI).

We cannot make DJGPP POSIX only (using -D_POSIX_SOURCE) to avoid this
kind of symbols conflicts due to the lack of both posix_memalign and
memalign (DJGPP non standard function) in that POSIX mode. We currently
rely on memalign for aligned heap allocation.

This conflict with the DJGPP libc which includes a pow2 function¹

We cannot make DJGPP POSIX only (using -D_POSIX_SOURCE) to avoid this
kind of symbols conflicts due to the lack of both posix_memalign and
memalign (DJGPP non standard function) in that POSIX mode. We currently
rely on memalign for aligned heap allocation.

[1]: http://www.delorie.com/djgpp/doc/libc-2.02/libc_536.html

This conflict with the DJGPP libc which includes a pow2 function¹

We cannot make DJGPP POSIX only (using -D_POSIX_SOURCE) to avoid this
kind of symbols conflicts due to the lack of both posix_memalign and
memalign (DJGPP non standard function) in that POSIX mode. We currently
rely on memalign for aligned heap allocation.

[1]: http://www.delorie.com/djgpp/doc/libc-2.02/libc_536.html

* commit '4cf2ffb7':
  idct: Have function pointer prototype match implementation
Merged-by: NClément Bœsch <u@pkh.me>

* commit '39cea657':
  aactab: Move extern keyword to the front of array declarations
Merged-by: NClément Bœsch <u@pkh.me>

* commit '85baef4f':
  vf_drawtext: Move static keyword to beginning of variable declaration

This commit is mostly a noop, see:
d9e2aceb
6d7aa437Merged-by: NClément Bœsch <u@pkh.me>

* commit '636515c3':
  examples/decode_video: remove a stray unrelated comment

This commit is a noop, see 8c4753f7Merged-by: NClément Bœsch <u@pkh.me>

* commit '8191f960':
  examples/decode_video: constify the AVCodec instance
Merged-by: NClément Bœsch <u@pkh.me>

* commit '5b4d7ac7':
  examples/encode_video: use the AVFrame API for allocating the frame
Merged-by: NClément Bœsch <u@pkh.me>

Consistent with other examples.

* commit 'd0a603a5':
  examples/encode_video: set the framerate
Merged-by: NClément Bœsch <u@pkh.me>

* commit 'e0252402':
  examples/encode_video: constify the AVCodec instance
Merged-by: NClément Bœsch <u@pkh.me>

* commit '7b1f0347':
  examples/avcodec: split the remaining two examples into separate files
Merged-by: NClément Bœsch <u@pkh.me>

* commit '90265814':
  examples/decode_audio: constify the AVCodec instance
Merged-by: NClément Bœsch <u@pkh.me>

* commit 'f5df897c':
  examples/avcodec: split audio decoding into a separate example
Merged-by: NClément Bœsch <u@pkh.me>

* commit 'f76698e7':
  examples/encode_audio: use the AVFrame API for allocating the data
Merged-by: NClément Bœsch <u@pkh.me>

* commit 'c00a11ab':
  examples/encode_audio: constify AVCodec instances
Merged-by: NClément Bœsch <u@pkh.me>

* commit '40aaa8da':
  examples/avcodec: split audio encoding into a separate example
Merged-by: NClément Bœsch <u@pkh.me>

Get rid of the "ret" variable, and always use err. Report the packet as
consumed if err is unset. This should be equivalent to the old code,
which obviously required err=0 for p->result>=0 (and otherwise,
p->result must have had the value err was last set to). The code block
added by commit 32a5b631 is also not needed anymore, because the new
code strictly returns err if it's >=0.
Reviewed-by: N"Ronald S. Bultje" <rsbultje@gmail.com>

Reviewed-by: NMichael Niedermayer <michael@niedermayer.cc>
Signed-off-by: NJames Almer <jamrial@gmail.com>

Reviewed-by: NMichael Niedermayer <michael@niedermayer.cc>
Signed-off-by: NJames Almer <jamrial@gmail.com>

Intra-only codecs should either be able to read these items from the
bitstream, or they should be set upon codec initialization. In both
cases, syncing these items at runtime is unnecessary.

In practice, this fixes race conditions for decoders that read these
values from the bitstream.

This prevents a race condition in files with multiple slices per frame.

The patch introduces race conditions.

This allows vp9dsp.h to only include the VP9 types header, and not the
decoder skeleton interface which is for hardware decoders (dxva2/vaapi).