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• lavfi/af_dynaudnorm : replace round by lrint

  16 décembre 2015, par Ganesh Ajjanagadde

  lavfi/af_dynaudnorm : replace round by lrint
  lrint is at least as fast, uses a superior rounding mode, and avoids an
  
  implicit cast.
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  

  • [DH] libavfilter/af_dynaudnorm.c

• lavfi/vf_crop : replace round by lrint

  16 décembre 2015, par Ganesh Ajjanagadde

  lavfi/vf_crop : replace round by lrint
  lrint is at least as fast, avoids an implicit cast, and uses a superior
  
  rounding mode.
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  

  • [DH] libavfilter/vf_crop.c

• How to add Qt to an existing C program and compile ?

  26 juin 2015, par El Sampsa

  I have a small Qt program I have compiled with qmake and make. When I launch make, I get the following commands for compilation :

  g++ -c -m64 -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++-64 -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -I/usr/lib/x86_64-linux-gnu -I/usr/include/SDL -I. -o simpleqt.o simpleqt.cpp

  (.. lets call that (**)) and

  g++ -m64 -Wl,-O1 -o qt simpleqt.o -L/usr/lib/x86_64-linux-gnu -lSDL -lX11 -lQtGui -lQtCore -lpthread

  .. and the program is compiled without problems.

  On the other hand, I have the ffmpeg library which has the "ffplay" program. I want to put some Qt things into ffplay. In the ffmpeg config files I tell to the make process (using "common.mak") that it should be verbose and when issuing "make ffplay", it gives me the following monster :

  gcc -I. -I./ -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DZLIB_CONST -I/home/sampsa/ffmpeg/build/include -std=c99 -fomit-frame-pointer -pthread -I/usr/include/freetype2 -I/usr/include/fribidi -I/usr/include/freetype2 -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/include/SDL -g -Wdeclaration-after-statement -Wall -Wdisabled-optimization -Wpointer-arith -Wredundant-decls -Wwrite-strings -Wtype-limits -Wundef -Wmissing-prototypes -Wno-pointer-to-int-cast -Wstrict-prototypes -Wempty-body -Wno-parentheses -Wno-switch -Wno-format-zero-length -Wno-pointer-sign -O3 -fno-math-errno -fno-signed-zeros -fno-tree-vectorize -Werror=format-security -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=return-type -Werror=vla -Wformat -Wno-maybe-uninitialized -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/include/SDL -MMD -MF ffplay.d -MT ffplay.o -c -o ffplay.o ffplay.c

  (lets call that monster (++)).

  So far, so good, I have two commands, one (**) for compiling Qt programs and another one (++) for another project (in this case, ffmpeg’s ffplay)

  How do I combine these two ?

  I have tried merging the flags in (**) into command (++). It compiles OK, but the moment I am adding

  #include <qtgui> 
  
  </qtgui>

  into "ffplay.c", all hell breaks loose and the compiler tells me (among many other things) :

  In file included from /usr/include/qt4/QtCore/qobjectdefs.h:45:0,
  from /usr/include/qt4/QtCore/qobject.h:47,
  from /usr/include/qt4/QtCore/qabstracteventdispatcher.h:45,
  from /usr/include/qt4/QtCore/QtCore:3,
  from /usr/include/qt4/QtGui/QtGui:3,
  from ffplay2.c:61 :
  /usr/include/qt4/QtCore/qnamespace.h:51:1 : warning : return type defaults to ‘int’ [enabled by default]
  QT_MODULE(Core)
  ^
  /usr/include/qt4/QtCore/qnamespace.h:51:1 : warning : function declaration isn’t a prototype [-Wstrict-prototypes]
  /usr/include/qt4/QtCore/qnamespace.h : In function ‘QT_MODULE’ :
  /usr/include/qt4/QtCore/qnamespace.h:54:1 : error : unknown type name ‘namespace’
  namespace
  ^
  ...
  ...

  If I combine flags in (**) to (++) and change the compiler from "gcc" to "g++", I get all kinds of errors, this time related to the "ffplay.c" source code.

  What is going on ?