Purpose: avdevice/decklink: Removed pthread dependency by replacing
semaphore used in code appropriately.  Doing so makes it easier to
build ffmpeg using Visual C++ on Windows.  This is a contination of
Kyle Schwarz's "avdevice/decklink: Remove pthread dependency" patch
that is available at https://patchwork.ffmpeg.org/patch/2654/ .  This
patch wasn't accepted, and as far as I can tell, there was no
follow-up after it was rejected.

Notes: Used Visual Studio 2015 (with update 3) for this.

Comments:

-- configure: Eliminated pthreads dependency for decklink_indev_deps
   and decklink_outdev_deps and replaced with threads dependency

-- libavdevice/decklink_common.cpp / .h:
a) Eliminated semaphore and replaced with a combination of a mutex,
   condition variable, and a counter (frames_buffer_available_spots).
b) Removed include of pthread.h and semaphore.h and now using
   libavutil/thread.h instead.

-- libavdevice/decklink_dec.cpp: Eliminated include of pthread.h and
   semaphore.h.

-- libavdevice/decklink_enc.cpp:
a) Eliminated include of pthread.h and semaphore.h.
b) Replaced use of semaphore with the equivalent using a combination
   of a mutex, condition variable, and a counter
   (frames_buffer_available_spots).  In theory, libavutil/thread.h and
   the associated code could have been modified instead to add
   cross-platform implementations of the sem_ functions, but an
   inspection of the ffmpeg source base indicates that there are only
   two cases in which semaphores are used (including this one that was
   replaced), so it was deemed to not be worth the effort.
Signed-off-by: Marton Balint <cus@passwd.hu>

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

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

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

The file is based on libopus, analyzed by Rostislav Pehlivanov.

refer to:
https://git.libav.org/?p=libav.git;a=commitdiff;h=0a4b9d0ccd10b3c39105f99bd320f696f69a75a2
add hls encrypt options looks like libav's libavformat/hlsenc.c
Reviewed-by: Moritz Barsnick <barsnick@gmx.net>
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

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

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

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>

Found-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: James Almer <jamrial@gmail.com>

* commit '92e6b31c':
  dxva2: Adjust multiple inclusion guard names to follow convention

This commit is a noop, see 180f9a09Merged-by: James Almer <jamrial@gmail.com>

* commit 'dbfe60ca':
  vf_hwupload_cuda: Add min/max limits for device option

This commit is a noop, see4df5a6a26a8aa08bbc6d027c2fb44fcf870e98d7
Merged-by: James Almer <jamrial@gmail.com>

* commit '4efea4ce':
  APIChanges: Mention where release 12 was cut

This commit is a noop.
Merged-by: James Almer <jamrial@gmail.com>

* commit '3f75e511':
  avio: Keep track of the amount of data written
Merged-by: James Almer <jamrial@gmail.com>

* commit 'fc85646a':
  libopusdec: fix out-of-bounds read
  libschroedingerdec: fix leaking of framewithpts
  libschroedingerdec: don't produce empty frames

This commit is a noop, see

a86ebbf7
3c0328d5
8c8f543bMerged-by: James Almer <jamrial@gmail.com>

Made appropriate changes to be able to successfully
build C++ files using a Visual C++ build on Windows.

Based on an earlier patch by Kyle Schwarz.

Comments:

-- compat/w32pthreads.h: Made appropriate changes to w32pthreads.h to
   get it to build when it is being included in a C++ file and built
   with Visual C++.  This is mostly a copy of Kyle Schwarz's patch as
   described above.

-- configure:
a) Now calling set_ccvars CXX to cause the various CXX_ variables to
   be setup properly.  For example, with MSVC (Microsoft Visual C++),
   this causes CXX_O to be set to -Fo$@ instead of using the default
   value.  The default value does not work with Visual C++.  This
   change will also have the impact of correcting CXX_O (and possibly
   CXX_C) for other compilers, although this is really only relevant
   for the Intel compiler, in addition to MSVC.
b) Now using cl for the C++ compiler for the MSVC toolchain.  This is
   currently only relevant for building the
   Blackmagic/Decklink-related files under avdevice.
Signed-off-by: Hendrik Leppkes <h.leppkes@gmail.com>

* commit 'd3da8a00':
  omx: Fix allocation check

This commit is a noop, see 16a75304Merged-by: James Almer <jamrial@gmail.com>

* commit 'd32bdadd':
  qsvdec: Fix memory leak on error

This commit is a noop, see b6f80b16Merged-by: James Almer <jamrial@gmail.com>

* commit '6a93b596':
  compat/atomics: add typecasts in atomic_compare_exchange_strong()
Merged-by: James Almer <jamrial@gmail.com>

* commit '2170017a':
  avutil: fix data race in av_get_cpu_flags()

This commit is a noop, see fed50c43Merged-by: James Almer <jamrial@gmail.com>

* commit 'd5759701':
  libkvazaar: Add missing header #includes
Merged-by: James Almer <jamrial@gmail.com>

* commit '892acc70':
  configure: Fail if cuda was enabled and is not available

This commit is a noop. Our CUDA implementation is autodectected.
Merged-by: James Almer <jamrial@gmail.com>

Based on a dependency addition from fbec58da

* commit 'f55c0a64':
  build: Drop stray golomb dependencies
Merged-by: James Almer <jamrial@gmail.com>

* commit 'fbec58da':
  build: Add an internal component for hevc_ps code

This commit is a noop, see 498e9e8eMerged-by: James Almer <jamrial@gmail.com>

* commit 'f912fd76':
  Add missing #includes for standalone spherical-information-related headers
  fate: Add spherical and stereo3d mov tests
  avprobe: Allow specifying multiple stream entries to be shown

This commit is a noop.
Merged-by: James Almer <jamrial@gmail.com>

* commit 'e90137c0':
  mov: Export spherical information
  lavc: Add spherical packet side data API
  lavu: Add AVSphericalMapping type and frame side data

This commit is a noop, see
8f58ecc3
e7a6f8c9
4dcdecf4Merged-by: James Almer <jamrial@gmail.com>

* commit '075acbb6':
  lavu: Add a video section to Doxygen documentation
Merged-by: James Almer <jamrial@gmail.com>

* commit '624aa8ab':
  build: Add missing Makefile entries and ifdefs for QSV hwaccels
Merged-by: James Almer <jamrial@gmail.com>

* commit 'c833c203':
  build: Ensure that the "all" target appears before all Makefile includes
Merged-by: James Almer <jamrial@gmail.com>

* commit '6bd9590b':
  build: Have old H.264/HEVC nvenc encoders select their new counterparts
Merged-by: James Almer <jamrial@gmail.com>

* commit '3e105d08':
  build: Move entries related to building TOOLS to a subdirectory Makefile
Merged-by: James Almer <jamrial@gmail.com>

* commit '4104cc56':
  build: Warn that reconfiguration is necessary if version.h files changed
Merged-by: James Almer <jamrial@gmail.com>

* commit 'f22da2cd':
  configure: add -fPIE instead of -pie to C flags for ThreadSanitizer

This commit is a noop, see 3f55752cMerged-by: James Almer <jamrial@gmail.com>

* commit '404cb747':
  configure: Pass CFLAGS_HEADERS through the right CFLAGS filter
Merged-by: James Almer <jamrial@gmail.com>

* commit '9265364b':
  build: Separate avisynth and avxsynth support

Mostly noop, since it could break linux configure with --enable-avisynth,
and the configure code which was simplified isn't even present in
ffmpeg.

Only merged the cosmetic re-ordering in the Makefile.
Merged-by: Hendrik Leppkes <h.leppkes@gmail.com>

Fixes some valgrind warnings.
Reviewed-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: Matthew Gregan <kinetik@flim.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>