1. 19 Jul, 2012 1 commit
    • Jingning Han's avatar
      Adds hybrid transform · 9824230f
      Jingning Han authored
      Adds ADST/DCT hybrid transform coding for Intra4x4 mode.
      The ADST is applied to directions in which the boundary
      pixels are used for prediction, while DCT applied to
      directions without corresponding boundary prediction.
      
      Adds enum TX_TYPE in b_mode_infor to indicate the transform
      type used.
      
      Make coding style consistent with google style.
      Fixed the commented issues.
      
      Experimental results in terms of bit-rate reduction:
      derf:   0.731%
      yt:     0.982%
      std-hd: 0.459%
      hd:     0.725%
      
      Will be looking at 8x8 transforms next.
      
      Change-Id: I46dbd7b80dbb3e8856e9c34fbc58cb3764a12fcf
      9824230f
  2. 18 Jul, 2012 5 commits
  3. 17 Jul, 2012 4 commits
  4. 16 Jul, 2012 5 commits
  5. 12 Jul, 2012 2 commits
  6. 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
  7. 30 Jun, 2012 1 commit
  8. 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
  9. 28 Jun, 2012 2 commits
  10. 27 Jun, 2012 2 commits
  11. 26 Jun, 2012 3 commits
  12. 25 Jun, 2012 1 commit
  13. 20 Jun, 2012 3 commits
  14. 19 Jun, 2012 3 commits
  15. 18 Jun, 2012 3 commits