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• lavf : Add an MPEG-DASH ISOFF segmenting muxer

  6 octobre 2014, par Martin Storsjö

  lavf : Add an MPEG-DASH ISOFF segmenting muxer
  This is mostly to serve as a reference example on how to segment
  
  the output from the mp4 muxer, capable of writing the segment
  
  list in four different ways :
  
   SegmentTemplate with SegmentTimeline
  
   SegmentTemplate with implicit segments
  
   SegmentList with individual files
  
   SegmentList with one single file per track, and byte ranges
  The muxer is able to serve live content (with optional windowing)
  
  or create a static segmented MPD.
  In advanced cases, users will probably want to do the segmenting
  
  in their own application code.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] Changelog
  • [DH] configure
  • [DH] libavformat/Makefile
  • [DH] libavformat/allformats.c
  • [DH] libavformat/dashenc.c
  • [DH] libavformat/version.h

• lavu : add an API function to return the Libav version string

  2 juillet 2015, par wm4

  lavu : add an API function to return the Libav version string
  This returns something like "v12_dev0-1332-g333a27c". This is much more
  
  useful than the individual library versions, of which there are too
  
  many, and which are very hard to map back to releases or git commits.
  Signed-off-by : Janne Grunau <janne-libav@jannau.net>
  

  • [DBH] .gitignore
  • [DBH] Makefile
  • [DBH] cmdutils.c
  • [DBH] doc/APIchanges
  • [DBH] libavutil/avutil.h
  • [DBH] libavutil/utils.c

• arm : Add NEON optimizations for 10 and 12 bit vp9 loop filter

  5 janvier 2017, par Martin Storsjö

  arm : Add NEON optimizations for 10 and 12 bit vp9 loop filter
  This work is sponsored by, and copyright, Google.
  This is pretty much similar to the 8 bpp version, but in some senses
  
  simpler. All input pixels are 16 bits, and all intermediates also fit
  
  in 16 bits, so there’s no lengthening/narrowing in the filter at all.
  For the full 16 pixel wide filter, we can only process 4 pixels at a time
  
  (using an implementation very much similar to the one for 8 bpp),
  
  but we can do 8 pixels at a time for the 4 and 8 pixel wide filters with
  
  a different implementation of the core filter.
  Examples of relative speedup compared to the C version, from checkasm :
  
                                     Cortex    A7     A8     A9    A53
  
  vp9_loop_filter_h_4_8_10bpp_neon :          1.83   2.16   1.40   2.09
  
  vp9_loop_filter_h_8_8_10bpp_neon :          1.39   1.67   1.24   1.70
  
  vp9_loop_filter_h_16_8_10bpp_neon :         1.56   1.47   1.10   1.81
  
  vp9_loop_filter_h_16_16_10bpp_neon :        1.94   1.69   1.33   2.24
  
  vp9_loop_filter_mix2_h_44_16_10bpp_neon :   2.01   2.27   1.67   2.39
  
  vp9_loop_filter_mix2_h_48_16_10bpp_neon :   1.84   2.06   1.45   2.19
  
  vp9_loop_filter_mix2_h_84_16_10bpp_neon :   1.89   2.20   1.47   2.29
  
  vp9_loop_filter_mix2_h_88_16_10bpp_neon :   1.69   2.12   1.47   2.08
  
  vp9_loop_filter_mix2_v_44_16_10bpp_neon :   3.16   3.98   2.50   4.05
  
  vp9_loop_filter_mix2_v_48_16_10bpp_neon :   2.84   3.64   2.25   3.77
  
  vp9_loop_filter_mix2_v_84_16_10bpp_neon :   2.65   3.45   2.16   3.54
  
  vp9_loop_filter_mix2_v_88_16_10bpp_neon :   2.55   3.30   2.16   3.55
  
  vp9_loop_filter_v_4_8_10bpp_neon :          2.85   3.97   2.24   3.68
  
  vp9_loop_filter_v_8_8_10bpp_neon :          2.27   3.19   1.96   3.08
  
  vp9_loop_filter_v_16_8_10bpp_neon :         3.42   2.74   2.26   4.40
  
  vp9_loop_filter_v_16_16_10bpp_neon :        2.86   2.44   1.93   3.88
  The speedup vs C code measured in checkasm is around 1.1-4x.
  
  These numbers are quite inconclusive though, since the checkasm test
  
  runs multiple filterings on top of each other, so later rounds might
  
  end up with different codepaths (different decisions on which filter
  
  to apply, based on input pixel differences).
  Based on START_TIMER/STOP_TIMER wrapping around a few individual
  
  functions, the speedup vs C code is around 2-4x.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/arm/Makefile
  • [DH] libavcodec/arm/vp9dsp_init_16bpp_arm_template.c
  • [DH] libavcodec/arm/vp9lpf_16bpp_neon.S