previous implementation was not thread/stream safe, since it used constant
memory
new implementation doesn't use any global objects, so it is thread/stream safe
(cherry picked from commit 4f5d30a865bd45f144cc70aed1057ac500a72e0c)
FFmpeg now requires that frames allocated with avcodec_alloc_frame are
freed with avcodec_free_frame.
(cherry picked from commit 77578d415f4d2b22a4ee1989ef0afda73c9d649b)
superres module fails to compile with the following error messages:
[100%] Building CXX object modules/superres/CMakeFiles/opencv_superres.dir/src/super_resolution.cpp.o
/opencv-2.4.10/modules/superres/src/frame_source.cpp: In function 'cv::Ptr<cv::superres::FrameSource> cv::superres::createFrameSource_Video_GPU(const string&)':
/opencv-2.4.10/modules/superres/src/frame_source.cpp:263:16: error: expected type-specifier before 'VideoFrameSource'
/opencv-2.4.10/modules/superres/src/frame_source.cpp:263:16: error: could not convert '(int*)operator new(4ul)' from 'int*' to 'cv::Ptr<cv::superres::FrameSource>'
/opencv-2.4.10/modules/superres/src/frame_source.cpp:263:16: error: expected ';' before 'VideoFrameSource'
/opencv-2.4.10/modules/superres/src/frame_source.cpp:263:41: error: 'VideoFrameSource' was not declared in this scope
/opencv-2.4.10/modules/superres/src/frame_source.cpp:264:1: error: control reaches end of non-void function [-Werror=return-type]
cc1plus: some warnings being treated as errors
make[3]: *** [modules/superres/CMakeFiles/opencv_superres.dir/src/frame_source.cpp.o] Error 1
make[3]: *** Waiting for unfinished jobs....
This is caused because the return value of the createFrameSource_Video_GPU function should be a VideoFrameSource_GPU object.
(cherry picked from commit 2e393ab83362743ba1825ad4b31d4a2925c606b4)
Currently, FFMPEG source files are included in highgui project file regardless of CMake WITH_FFMPEG option.
After applying this PR FFMPEG files are included only if WITH_FFMPEG option is enabled.
In C99 'inline' is not a hint to the compiler to inline the function,
it is an attribute that affects the linkage of the function. 'inline'
functions are required to have a definition in a different compiliation
unit, so compilers are free to delete 'inline' functions if they want to.
This issue can be seen in Clang when compiling at -O0. Clang
will sometimes delete 'inline' functions which creates an invalid
program.
Issue 3746: http://code.opencv.org/issues/3746
