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• build : Generate pkg-config files from Make and not from configure

  20 décembre 2016, par Diego Biurrun

  build : Generate pkg-config files from Make and not from configure
  This moves work from the configure to the Make stage where it can
  
  be parallelized and ensures that pkgconfig files are updated when
  
  library versions change.
  Bug-Id : 449
  

  • [DBH] Makefile
  • [DBH] avbuild/.gitignore
  • [DBH] avbuild/library.mak
  • [DBH] avbuild/pkgconfig_generate.sh
  • [DBH] configure
  • [DBH] libavcodec/Makefile
  • [DBH] libavdevice/Makefile
  • [DBH] libavfilter/Makefile
  • [DBH] libavformat/Makefile
  • [DBH] libavresample/Makefile
  • [DBH] libavutil/Makefile
  • [DBH] libswscale/Makefile

• imdct15 : replace the FFT with a faster PFA FFT algorithm

  4 janvier 2017, par Rostislav Pehlivanov

  imdct15 : replace the FFT with a faster PFA FFT algorithm
  This commit replaces the current inefficient non-power-of-two FFT with a
  
  much faster FFT based on the Prime Factor Algorithm.
  
  Although it is already much faster than the old algorithm without SIMD,
  
  the new algorithm makes use of the already very throughouly SIMD’d power
  
  of two FFT, which improves performance even more across all platforms
  
  which we have SIMD support for.
  Most of the work was done by Peter Barfuss, who passed the code to me to
  
  implement into the iMDCT and the current codebase. The code for a
  
  5-point and 15-point FFT was derived from the previous implementation,
  
  although it was optimized and simplified, which will make its future
  
  SIMD easier. The 15-point FFT is currently using 6% of the current
  
  overall decoder overhead.
  The FFT can now easily be used as a forward transform by simply not
  
  multiplying the 5-point FFT’s imaginary component by -1 (which comes
  
  from the fact that changing the complex exponential’s angle by -1 also
  
  changes the output by that) and by multiplying the "theta" angle of the
  
  main exptab by -1. Hence the deliberately left multiplication by -1 at
  
  the end.
  FATE passes, and performance reports on other platforms/CPUs are
  
  welcome.
  Performance comparisons :
  iMDCT, PFA :
  
  101127 decicycles in speed,   32765 runs,      3 skips
  
  iMDCT, Old :
  
  211022 decicycles in speed,   32768 runs,      0 skips
  Standalone FFT, 300000 transforms of size 960 :
  
      PFA        Old FFT     kiss_fft    libfftw3f
  
      3.659695s, 15.726912s, 13.300789s, 1.182222s
  Being only 3x slower than libfftw3f is a big achievement by itself.
  There appears to be something capping the performance in the iMDCT side
  
  of things, possibly during the pre-stage reindexing. However, it is
  
  certainly fast enough for now.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/imdct15.c
  • [DH] libavcodec/imdct15.h

• Annual Release of External-Videos plugin – we’ve hit v1.0

  13 janvier 2017, par silvia

  This is the annual release of my external-videos wordpress plugin and with the help of Andrew Nimmolo I’m proud to annouce we’ve reached version 1.0 !

  So yes, my external-videos wordpress plugin is now roughly 7 years old, who would have thought ! During the year, I don’t get the luxury of spending time on maintaining this open source love child of mine, but at Christmas, my bad conscience catches up with me – every year ! I then spend some time going through bug reports, upgrading the plugin to the latest wordpress version, upgrading to the latest video site APIs, testing functionality and of course making a new release.

  This year has been quite special. The power of open source has kicked in and a new developer took an interest in external-videos. Andrew Nimmolo submitted patches over all of 2016. He decided to bring the external-videos plugin into the new decade with a huge update to the layout of the settings pages, general improvements, and an all-round update of all the video site APIs which included removing their overly complex SDKs and going straight for the REST APIs.

  Therefore, I’m very proud to be able to release version 1.0 today. Thanks, Andrew !

  Enjoy – and I look forward to many more contributions – have a Happy 2017 !

  —

  NOTE : If you’re upgrading from an older version, you might need to remove and re-add your social video sites because the API details have changed a bit. Also, we noticed that there were layout issues on WordPress 4.3.7, so try and make sure your WordPress version is up to date.