1. 02 Apr, 2018 1 commit
  2. 28 Jun, 2017 2 commits
  3. 30 May, 2017 2 commits
  4. 06 Apr, 2017 2 commits
  5. 13 Oct, 2015 2 commits
    • Christophe Gisquet's avatar
      x86: simple_idct: 12bits versions · 7ece8b50
      Christophe Gisquet authored
      On 12 frames of a 444p 12 bits DNxHR sequence, _put function:
      C:         78902 decicycles in idct,  262071 runs,     73 skips
      avx:       32478 decicycles in idct,  262045 runs,     99 skips
      
      Difference between the 2:
      stddev:    0.39 PSNR:104.47 MAXDIFF:    2
      
      This is unavoidable and due to the scale factors used in the x86
      version, which cannot match the C ones.
      
      In addition, the trick of adding an initial bias to the input of a
      pass can overflow, as the input coefficients are already 15bits,
      which is the maximum this function can handle.
      
      Overall, however, the omse on 12 bits samples goes from 0.16916 to
      0.16883. Reducing rowshift by 1 improves to 0.0908, but causes
      overflows.
      Signed-off-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
      7ece8b50
    • Christophe Gisquet's avatar
      x86: simple_idct(_put): 10bits versions · 4369b9dc
      Christophe Gisquet authored
      Modeled from the prores version. Clips to [0;1023] and is bitexact.
      Bitexactness requires to add offsets in different places compared to
      prores or C, and makes the function approximately 2% slower.
      
      For 16 frames of a DNxHD 4:2:2 10bits test sequence:
      
      C:    60861 decicycles in idct, 1048205 runs,    371 skips
      sse2: 27567 decicycles in idct, 1048216 runs,    360 skips
      avx:  26272 decicycles in idct, 1048171 runs,    405 skips
      
      The add version is not implemented, so the corresponding dsp
      function is set to NULL to make it clear in a code executing it.
      Signed-off-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
      4369b9dc
  6. 25 Sep, 2014 1 commit
  7. 08 Aug, 2014 1 commit
  8. 01 Aug, 2014 1 commit
    • Diego Biurrun's avatar
      idct: Split off Xvid IDCT · a786c825
      Diego Biurrun authored
      The Xvid IDCT is only required to decode some Xvid-encoded MPEG-4 files,
      so there is no point in having it as an unconditional part of idctdsp.
      a786c825
  9. 19 Jul, 2014 1 commit
  10. 18 Jul, 2014 2 commits
  11. 30 Jun, 2014 1 commit