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• avcodec/ffv1enc : replace the remaining log2() by magic

  30 mars, par Michael Niedermayer

  avcodec/ffv1enc: replace the remaining log2() by magic
  
  big secret, reading a float as the corresponding integer is a good
  approximation of log2() for numbers not too close to 1.0. At the same
  time it maintains strict monotonicity
  
  this reduces run time from 19sec to 17sec for the slowest of my testcases
  (with default remap_optimizer 3)
  
  Compression is about the same:
  
  -rw-r----- 1 michael michael  497603370 Mar 30 15:23 float-303503-fixed-40-optim-3-1log2F.nut
  -rw-r----- 1 michael michael  497603374 Mar 28 11:27 float-303503-fixed-40-optim-3b.nut
  -rw-r----- 1 michael michael  549938852 Mar 28 11:27 float-303503-float16-40-optim-3b.nut
  -rw-r----- 1 michael michael  549938857 Mar 30 15:23 float-303503-float16-40-optim-3-1log2F.nut
  -rw-r----- 1 michael michael 1150827841 Mar 28 11:28 float-303503-float-40-optim-3b.nut
  -rw-r----- 1 michael michael 1150832913 Mar 30 15:22 float-303503-float-40-optim-3ref-log2F2.nut
  
  Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/ffv1enc.c

• avcodec/ffv1enc : replace 3 double precision log2() by 1 single precision log2()

  30 mars, par Michael Niedermayer

  avcodec/ffv1enc: replace 3 double precision log2() by 1 single precision log2()
  
  This makes the remap finding heuristic much faster
  
  Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/ffv1enc.c

• avcodec/hevc/hevcdec : Use bitfield instead of array of flags

  30 mars, par Andreas Rheinhardt

  avcodec/hevc/hevcdec: Use bitfield instead of array of flags
  
  It is simpler, avoids several loops and also makes GCC no longer
  emit bogus -Wstringop-overflow= warnings.
  
  Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/hevc/hevcdec.c

• avcodec/ac3dec : Read spx flags at once, not one bit at a time

  30 mars, par Andreas Rheinhardt

  avcodec/ac3dec: Read spx flags at once, not one bit at a time
  
  Doing so gets rid of a stupid GCC -Wstringop-overflow= warning
  (GCC somehow believes that fbw_channels can be 7 with the old
  form of the code, so that channel_uses_spx[7] would be written
  to, but now it no longer believes so).
  
  Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/ac3dec.c

• avcodec/dct : Make declarations and definitions match

  30 mars, par Andreas Rheinhardt

  avcodec/dct: Make declarations and definitions match
  
  GCC considers declarations using a parameter of pointer
  type (or equivalently a parameter using an array of unspecified
  dimensions) to be inconsistent with a declaration using
  a known-length array type and emits a -Warray-parameter warning
  for several ff_j_rev_dct* functions for this.
  
  This patch makes the declarations match the actual definitions
  to suppress these (IMO nonsensical) warnings.
  
  Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/dct.h
  • [DH] libavcodec/jrevdct.c