Purpose: Made minor changes to get the decklink avdevice code to build
using Visual C++.
Notes: Made changes to configure per Hendrik Leppkes's review of first
and second versions of patch. Also made slight alterations per Marton
Balint's reviews.
Comments:
-- configure: Added if enabled decklink section and setting
decklink_indev_extralibs and decklink_outdev_extralibs here for
both mingw and Windows. Also eliminated the setting of these
variables in the mingw section earlier in the file.
-- libavdevice/decklink_common.cpp: Switched the order of the include
of libavformat/internal.h to workaround build issues with Visual
C++. See comment in file for more details.
-- libavdevice/decklink_dec.cpp:
a) Rearranged the include of libavformat/internal.h (for reasons as
described above).
b) Made slight alteration to an argument for call to av_rescale_q() to
workaround a compiler error with Visual C++. This appears to only
be an issue when building C++ files with Visual C++. See comment
in code for more details.
-- libavdevice/decklink_enc.cpp: Rearranged the include of
libavformat/internal.h (for reasons as described above).
Signed-off-by: Aaron Levinson <alevinsn@aracnet.com>
Signed-off-by: Marton Balint <cus@passwd.hu>
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>
Aaron Levinson
Marton Balint
Patrick Felt
Timothy Gu
Deti Fliegl
Ramiro Polla