1. 22 Jul, 2011 1 commit
    • Yunqing Wang's avatar
      Preload reference area to an intermediate buffer in sub-pixel motion search · 20bd1446
      Yunqing Wang authored
      In sub-pixel motion search, the search range is small(+/- 3 pixels).
      Preload whole search area from reference buffer into a 32-byte
      aligned buffer. Then in search, load reference data from this buffer
      instead. This keeps data in cache, and reduces the crossing cache-
      line penalty. For tulip clip, tests on Intel Core2 Quad machine(linux)
      showed encoder speed improvement:
        3.4%   at --rt --cpu-used =-4
        2.8%   at --rt --cpu-used =-3
        2.3%   at --rt --cpu-used =-2
        2.2%   at --rt --cpu-used =-1
      
      Test on Atom notebook showed only 1.1% speed improvement(speed=-4).
      Test on Xeon machine also showed less improvement, since unaligned
      data access latency is greatly reduced in newer cores.
      
      Next, I will apply similar idea to other 2 sub-pixel search functions
      for encoding speed > 4.
      
      Make this change exclusively for x86 platforms.
      
      Change-Id: Ia7bb9f56169eac0f01009fe2b2f2ab5b61d2eb2f
      20bd1446
  2. 18 Jul, 2011 4 commits
    • John Koleszar's avatar
      Improved 1-pass CBR rate control · b5ea2fbc
      John Koleszar authored
      This patch attempts to improve the handling of CBR streams with
      respect to the short term buffering requirements. The "buffer level"
      is changed to be an average over the rc buffer, rather than a long
      running average. Overshoot is also tracked over the same interval
      and the golden frame targets suppressed accordingly to correct for
      overly aggressive boosting.
      
      Testing shows that this is fairly consistently positive in one
      metric or another -- some clips that show significant decreases
      in quality have better buffering characteristics, others show
      improvenents in both.
      
      Change-Id: I924c89aa9bdb210271f2e03311e63de3f1f8f920
      b5ea2fbc
    • John Koleszar's avatar
      Merge "Disable __longjmp_chk protection" · 74ad25a4
      John Koleszar authored
      74ad25a4
    • John Koleszar's avatar
      Merge "Fixed rate histogram calculation" · da39e505
      John Koleszar authored
      da39e505
    • Tero Rintaluoma's avatar
      Fixed rate histogram calculation · fd41cb84
      Tero Rintaluoma authored
      Using small values for --buf-sz= in command line causes
      floating point exception due to division by zero.
      
      Change-Id: Ibfe2d44db922993a78ebc9a4a1087d9625de48ae
      fd41cb84
  3. 15 Jul, 2011 3 commits
  4. 14 Jul, 2011 2 commits
  5. 13 Jul, 2011 11 commits
  6. 12 Jul, 2011 4 commits
  7. 11 Jul, 2011 1 commit
  8. 08 Jul, 2011 6 commits
  9. 07 Jul, 2011 2 commits
  10. 01 Jul, 2011 1 commit
  11. 30 Jun, 2011 5 commits