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• swscale/utils : add helper function to infer colorspace metadata

  28 novembre 2024, par Niklas Haas

  swscale/utils : add helper function to infer colorspace metadata
  Logic is loosely on equivalent decisions in libplacebo. The basic idea is to try
  
  and be a bit conservative by treating AVCOL_*_UNSPECIFIED as a no-op, unless the
  
  other primaries set are non-standard / wide-gamut or HDR. This helps avoid
  
  unintended or unexpected colorspace conversions, while forcing it in cases where
  
  we are almost certain it is needed. The major departure from libplacebo semantics
  
  is that we no default to a 1000:1 contrast ration for SDR displays, instead modelling
  
  them as idealized devices with an infinite contrast ratio.
  In either case, setting SWS_STRICT overrides this behavior in favor of always
  
  requiring explicit colorspace metadata.
  

  • [DH] libswscale/utils.c
  • [DH] libswscale/utils.h

• ffbuild/common : Fix CPPFLAGS applied for compiling C++ files

  12 mai 2022, par Andreas Rheinhardt

  ffbuild/common : Fix CPPFLAGS applied for compiling C++ files
  Currently, $(CPPFLAGS) and $(CFLAGS) are prepended to CXXFLAGS
  
  (the flags for compiling C++) like this :
  
  CXXFLAGS := $(CPPFLAGS) $(CFLAGS) $(CXXFLAGS)
  
  Using " :=" creates a simply expanded variable, i.e. the values
  
  of the variable at the time of assignment are used and later
  
  modifications to them are ignored (using a recursively expanding
  
  variable (i.e. "=" instead of " :=") is not really possible here,
  
  as there would be an infinite loop when evaluating CXXFLAGS).
  Yet we perform later additions to CPPFLAGS : HAVE_AV_CONFIG_H and
  
  BUILDING_libfoo are defined. These do not reach C++ compilations.
  To fix this a trick is employed to prepend to a recursively
  
  expanded variable while keeping it recursively expanded.
  There are two practical consequences of this : C++ files now no longer
  
  include the version.h header, but only the version_major.h header
  
  of their library, saving some recompilations. Furthermore, they
  
  now get some optimized math functions (namely the ones from
  
  lavu/intmath.h instead of the ones from lavu/common.h).
  
  (av_parity() is the only one for which it makes a difference.)
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] ffbuild/common.mak

• avformat/rtsp : Fix timeout option

  30 mai 2021, par Andriy Gelman

  avformat/rtsp : Fix timeout option
  92c40ef882be115e72d2aa02f9032b7ce88f8537 added a listen_timeout option
  
  for sdp. This allowed a user to set variable timeout which was
  
  originally hard coded to 10 seconds.
  The commit used the initial_timeout variable to store the value. But
  
  this variable is shared with rtsp where it's used to infer a "listen"
  
  mode. Thus, the timeout value could not be set in rtsp, and the default
  
  value (initial_timeout = -1) would give 100ms timeout.
  This was attempted to be fixed in c8101aabee654f6d147a4d89f77fa73e18908610,
  
  which changed the meaning of initial_timeout = -1 to be an infinite
  
  timeout. However, it did not address the issue that the timeout could
  
  still not be set. Being able to set the timeout is useful because it
  
  allows to automatically reconfigure from a udp to tcp connection in the
  
  lower transport.
  In this commit this is fixed by using the stimeout variable to
  
  store the timeout value.
  Signed-off-by : Andriy Gelman <andriy.gelman@gmail.com>
  

  • [DH] libavformat/rtsp.c
  • [DH] libavformat/rtsp.h