1. 17 Jul, 2012 4 commits
  2. 16 Jul, 2012 5 commits
  3. 12 Jul, 2012 2 commits
  4. 09 Jul, 2012 1 commit
    • Yaowu Xu's avatar
      change to enable encoder to clamp UV motion vector · a81baae7
      Yaowu Xu authored
      This is to avoid a rare encoder/decoder mismatch for MB using SPLITMV
      mode. In decoder, the UV mv can be determined to need clamp, but the
      flag is never set in encoder motion vector selection process, and the
      clamp is not done in encoding in encoder.
      
      Change-Id: I60520d3f790354c7855dadf03f0978ea9b77e2c0
      a81baae7
  5. 30 Jun, 2012 1 commit
  6. 29 Jun, 2012 4 commits
    • Christian Duvivier's avatar
      Get rid of some cast. · 5a5ced3e
      Christian Duvivier authored
      Change-Id: Iff5ccf2400bcb7b78c7b70f289ea65c982efddd5
      5a5ced3e
    • Christian Duvivier's avatar
      Fix warnings. · c5b70370
      Christian Duvivier authored
      Change-Id: I6dd27a0ea661e6f10a55d7841021b66ae4fc72ae
      c5b70370
    • Daniel Kang's avatar
      Add 8x8 fDCT unit test. · 26641c74
      Daniel Kang authored
      Also factorize ACMRandom to acm_random.h.
      
      Change-Id: I3b6eeb36fcbf7ae6dd3d2892bc40348f5c17982b
      26641c74
    • Hui Su's avatar
      Add lossless compression mode. · e44ee38a
      Hui Su authored
      This commit adds lossless compression capability to the experimental
      branch. The lossless experiment can be enabled using --enable-lossless
      in configure. When the experiment is enabled, the encoder will use
      lossless compression mode by command line option --lossless, and the
      decoder automatically recognizes a losslessly encoded clip and decodes
      accordingly.
      
      To achieve the lossless coding, this commit has changed the following:
          1. To encode at lossless mode, encoder forces the use of unit
      quantizer, i.e, Q 0, where effective quantization is 1. Encoder also
      disables the usage of 8x8 transform and allows only 4x4 transform;
          2. At Q 0, the first order 4x4  DCT/IDCT have been switched over
      to a pair of forward and inverse Walsh-Hadamard Transform
      (http://goo.gl/EIsfy),  with proper scaling applied to match the range
      of the original 4x4 DCT/IDCT pair;
          3. At Q 0, the second order remains to use the previous
      walsh-hadamard transform pair. However, to maintain the reversibility
      in second order transform at Q 0, scaling down is applied to first
      order DC coefficients prior to forward transform, and scaling up is
      applied to the second order output prior to quantization. Symmetric
      upscaling and downscaling are added around inverse second order
      transform;
          4. At lossless mode, encoder also disables a number of minor
      features to ensure no loss is introduced, these features includes:
              a. Trellis quantization optimization
              b. Loop filtering
              c. Aggressive zero-binning, rounding and zero-bin boosting
              d. Mode based zero-bin boosting
      
      Lossless coding test was performed on all clips within the derf set,
      to verify that the commit has achieved lossless compression for all
      clips. The average compression ratio is around 2.57 to 1.
      (http://goo.gl/dEShs)
      
      Change-Id: Ia3aba7dd09df40dd590f93b9aba134defbc64e34
      e44ee38a
  7. 28 Jun, 2012 2 commits
  8. 27 Jun, 2012 2 commits
  9. 26 Jun, 2012 3 commits
  10. 25 Jun, 2012 1 commit
  11. 20 Jun, 2012 3 commits
  12. 19 Jun, 2012 3 commits
  13. 18 Jun, 2012 4 commits
  14. 15 Jun, 2012 2 commits
    • Deb Mukherjee's avatar
      Adaptive entropy coding of coefficients, modes, mv. · 1fe85a35
      Deb Mukherjee authored
      This patch incorporates adaptive entropy coding of coefficient tokens,
      and mode/mv information based on distributions encountered in a frame.
      Specifically, there is an initial forward update to the probabilities
      in the bitstream as before for coding the symbols in the frame, however
      at the end of decoding each frame, the forward update to the
      probabilities is reverted and instead the probabilities are updated
      towards the actual distributions encountered within the frame.
      The amount of update is weighted by the number of hits within each
      context.
      
      Results on derf/hd/std-hd are all up by 1.6%.
      
      On derf, the most of the gains come from coefficients, however for the
      hd and std-hd sets, the most of the gains come from the mode/mv
      information updates.
      
      Change-Id: I708c0e11fdacafee04940fe7ae159ba6844005fd
      1fe85a35
    • Daniel Kang's avatar
  15. 12 Jun, 2012 3 commits
    • Daniel Kang's avatar
      Adds x86inc.asm and update idct/dequant mmx · 7a000715
      Daniel Kang authored
      Updates idct/dequant mmx assembly to work with vpnext instead of vp8.
      
      Also adds x86inc.asm
      
      Change-Id: I6e147d5e89177ae449271e97e50d082eb11b078e
      7a000715
    • Yaowu Xu's avatar
      changed to use a fixed number for update probabity · 074a38b1
      Yaowu Xu authored
      This commit is to remove two arrays, which contain the probabilities
      of how likely each probability in coef_probs table is updated. The
      commit changed to use a fixed number "252".
      
      Surprisedly, the overall impact on quality is close to zero, which
      basically says the two big static arrays are not helpful at all.
      derf: -0.016%, -0.020%
      std-hd: 0.000%, -0.013%
      yt: -0.022%, +0.007%
      yt-hd: -0.038%, +0.034%
      
      Change-Id: Ifee94d28a37dcab4f1d2b994bd5b07575be42b72
      074a38b1
    • Yaowu Xu's avatar
      Added the ability to accumulate coef stats across encodings · bb25083d
      Yaowu Xu authored
      This commit added the ability to accumulate the coef stats across
      different encodings using an intermediate binary stats files. The
      accumulation happens only the binary stats file exists in current
      directory. The encoder needs to be built with "ENTROPY_STATS" to
      allow the output. The commit also fixed a few formating issues in
      output stats file.
      
      Change-Id: Ib1a41180aa554845cf51e4421a230b128a3a82b4
      bb25083d