1. 18 Oct, 2016 2 commits
  2. 14 Oct, 2016 3 commits
    • Nathan E. Egge's avatar
      Add API for writing trees using a CDF. · 44460148
      Nathan E. Egge authored
      Added aom_write_tree_cdf() and aom_read_tree_cdf() function calls to
       bitwriter.h and bitreader.h respectively.
      These calls take a multisymbol CDF and an index and directly encode the
       symbol using the enabled entropy coder.
      Currently only the daala entropy encoder supports this (enabled with
       --enable-daala_ec) and a compile error is thrown otherwise.
      
      Change-Id: I2fa1e87af4352c94384e0cfdbfd170ac99cf3705
      44460148
    • Nathan E. Egge's avatar
      Use Daala entropy coder to code trees. · 43acafde
      Nathan E. Egge authored
      When building with --enable-daala_ec, calls to aom_write_tree() and
       aom_read_tree() will convert a aom_tree_index structure with associated
       aom_prob probabilities into a CDF on the fly for use with the
       od_ec_encode_cdf_q15().
      The number of symbols in the CDF is capped at 16, and trees that contain
       more than 16 leaf nodes are handled by splitting the most likely, e.g.,
       highest probability symbols, first and coding multiple symbols if
       necessary.
      
      ntt-short-1:
      
               MEDIUM (%) HIGH (%)
          PSNR 0.000227   0.000213
       PSNRHVS 0.000215   0.000205
          SSIM 0.000229   0.000209
      FASTSSIM 0.000229   0.000214
      
      subset1:
      
                RATE (%)  DSNR (dB)
          PSNR -0.00026   0.00002
       PSNRHVS -0.00026   0.00002
          SSIM -0.00026   0.00001
      FASTSSIM -0.00026   0.00001
      
      Change-Id: Icb1a8cb854fd81fdd88fbe4bc6761c7eb4757dfe
      43acafde
    • Nathan E. Egge's avatar
      Use Daala entropy coder to code bits. · 8043cc40
      Nathan E. Egge authored
      When building with --enable-daala_ec, calls to aom_write() and aom_read()
       use the daala entropy coder to write and read bits.
      When the probability is exactly 0.5 (128), then raw bits are used.
      
      ntt-short-1:
      
                MEDIUM (%) HIGH (%)
          PSNR -0.027556  -0.020114
       PSNRHVS -0.027401  -0.020169
          SSIM -0.027587  -0.020151
      FASTSSIM -0.027592  -0.020102
      
      subset1:
      
               RATE (%)  DSNR (dB)
          PSNR 0.03296  -0.00210
       PSNRHVS 0.03537  -0.00281
          SSIM 0.03299  -0.00161
      FASTSSIM 0.03458  -0.00111
      
      Change-Id: I48ad8eb40fc895d62d6e241ea8abc02820d573f7
      8043cc40