1. 04 Nov, 2011 5 commits
  2. 03 Nov, 2011 2 commits
  3. 02 Nov, 2011 1 commit
  4. 01 Nov, 2011 5 commits
  5. 31 Oct, 2011 1 commit
  6. 28 Oct, 2011 2 commits
    • Yaowu Xu's avatar
      added code to clear 2nd order block when appropriate · 88e24f07
      Yaowu Xu authored
      It is discovered that in rare situations the 2nd order block may
      produce a few small magnitude coefficients that has no effect on
      reconstruction. The situations are a combination of low quantizer
      values (high quality) and low energy in residual signals (content
      dependent). This commit added code to detect such cases and reset
      the 2nd order block to all 0.
      
      Patch 1 to 4 used code to do all-zero-check on idct result buffer,
      and tests on derf set showed a consistent gain of .12%-.14% on all
      metrics.But due to a recent change Ie31d90b, the idct result buffer
      is not longer populated. So patch 5&6 use an alternative method to
      detect the situations. Tests on derf set now shows a consistent
      quality gain of .16%-.20%.
      
      As suggested by Jim, Patch 7&8 removed the condition of all first
      order block not having any coefficient, instead we reset 2nd order
      coefficients to all 0 if sum of absolute value of the coefficients
      is small. So it does slightly more than just detecting the oddity
      as discussed above, but tests on derf set now show a consistent
      gain of .20%-.23% on all metrics.
      
      It is worth noting here that this change does not have any effect
      on mid/high quantizer range, it only affects the quantizer value
      18 or blow. Within this range, the change helps compression by up
      to 2.5% on clips in the derf set.
      
      Change-Id: I718e19cf59a4fc2462cb7070832759beb9f7e7dd
      88e24f07
    • Scott LaVarnway's avatar
      Merge "Improved decode_split_mv()" · e0309e15
      Scott LaVarnway authored
      e0309e15
  7. 27 Oct, 2011 4 commits
  8. 26 Oct, 2011 5 commits
  9. 25 Oct, 2011 5 commits
  10. 24 Oct, 2011 7 commits
  11. 21 Oct, 2011 3 commits