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Les articles publiés sur le site

• hwcontext : Add device derivation

  4 mars 2017, par Mark Thompson

  hwcontext: Add device derivation
  
  Creates a new device context from another of a different type which
  refers to the same underlying hardware.
  

  • [DBH] doc/APIchanges
  • [DBH] libavutil/hwcontext.c
  • [DBH] libavutil/hwcontext.h
  • [DBH] libavutil/hwcontext_internal.h
  • [DBH] libavutil/version.h

• avutil/md5 : fix misaligned reads

  3 mars 2017, par James Almer

  avutil/md5: fix misaligned reads
  
  This makes ubsan happy and also considerably increases performance on
  big endian systems.
  
  Tested on an IBM POWER7 3.55 GHz
  
  Before:
  
  2.24user 0.14system 0:02.39elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
  2.26user 0.11system 0:02.38elapsed 99%CPU (0avgtext+0avgdata 2688maxresident)k
  2.23user 0.15system 0:02.38elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
  2.25user 0.12system 0:02.38elapsed 100%CPU (0avgtext+0avgdata 2624maxresident)k
  2.20user 0.15system 0:02.36elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
  
  After:
  
  1.86user 0.13system 0:02.00elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
  1.89user 0.11system 0:02.01elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
  1.85user 0.14system 0:02.00elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
  1.84user 0.15system 0:01.99elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
  1.89user 0.13system 0:02.02elapsed 99%CPU (0avgtext+0avgdata 2688maxresident)k
  
  Tested-by: Nicolas George <george@nsup.org>
  Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
  Signed-off-by: James Almer <jamrial@gmail.com>
  Signed-off-by: Sean McGovern <gseanmcg@gmail.com>
  

  • [DBH] libavutil/md5.c

• build : Special-case handling of SDL CFLAGS

  2 mars 2017, par Diego Biurrun

  build: Special-case handling of SDL CFLAGS
  
  SDL adds some "special" CFLAGS that interfere with building normal
  binaries. Capture those CFLAGS separately and avoid adding them to
  the general CFLAGS.
  

  • [DBH] configure

• Add ClearVideo decoder

  2 mars 2017, par Kostya Shishkov

  Add ClearVideo decoder
  
  Only I-frames are decoded for now.
  
  Signed-off-by: Diego Biurrun <diego@biurrun.de>
  

  • [DBH] Changelog
  • [DBH] doc/general.texi
  • [DBH] libavcodec/Makefile
  • [DBH] libavcodec/allcodecs.c
  • [DBH] libavcodec/avcodec.h
  • [DBH] libavcodec/clearvideo.c
  • [DBH] libavcodec/codec_desc.c
  • [DBH] libavcodec/version.h
  • [DBH] libavformat/riff.c
  • [DBH] libavformat/rm.c

• pixlet : Fix architecture-dependent code and values

  2 mars 2017, par Vittorio Giovara

  pixlet: Fix architecture-dependent code and values
  
  The constants used in the decoder used floating point precision,
  and this caused different values to be generated on different
  architectures. Additionally on big endian machines, the fate test
  would output bytes in native order, which is different from the one
  hardcoded in the test.
  
  So, eradicate floating point numbers and use fixed point (32.32)
  arithmetics everywhere, replacing constants with precomputed integer
  values, and force the pixel format output to be the same in the fate
  test.
  
  Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DBH] libavcodec/pixlet.c
  • [DBH] tests/fate/video.mak
  • [DBH] tests/ref/fate/pixlet