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20 authors
  1. Feb 12, 2017
    • Angie Chiang's avatar
      Implement shorter-tap first in convolve_round · 118bf67c
      Angie Chiang authored 
      The performance change is 0.004% on lowres

Change-Id: If3702ba6377ac42997e7d49b8959ff16fb182daa
      118bf67c
    • David Barker's avatar
      Fix segfault with loop-restoration on x86. · befcc425
      David Barker authored 
      The WienerInfo struct requires a 16-byte alignment on x86,
since it contains filter coefficients which are loaded using
SSE aligned load instructions. But on 32-bit x86, the default
alignment of aom_malloc/aom_realloc is only 8 bytes, leading
to occasional segfaults.

To fix this, rather than using aom_realloc to resize WienerInfo
structures, we always free and re-allocate them using aom_memalign

BUG=aomedia:345

Change-Id: Ib1b2a42d4a2fa215dcc81ea481c51271ab068a37
      befcc425
  3. Feb 11, 2017
    • Zoe Liu's avatar
      Add a new experiment of REF_ADAPT · b05e5d10
      Zoe Liu authored 
      Noticed that some ALTREF_FRAMEs could have used compound modes for its
prediction but have been labeled as SINGLE_REFERENCE mode in the frame
header. This experiment is to remove the COMPOUND_REFERENCE mode from
the frame-level reference mode choices and only leave SINGLE_REFERENCE
and REFERENCE_MODE_SELECT the two choices in the frame header.

When turning on both ext-refs and ref-adapt, compared against ext-refs
itself, a small gain is achieved. In PSNR, the bitrate saving gains are
as follows:

lowres: Avg -0.120%; BDRate -0.128%
midres: Avg -0.155%; BDRate -0.128%

Change-Id: I2cfff8a6b7eaa65ef863dbdbc4dd086d3b586f8c
      b05e5d10
  5. Feb 10, 2017
    • Steinar Midtskogen's avatar
      Speed up CLPF when there's nothing to clip · f844e6ef
      Steinar Midtskogen authored 
      Gives 7% speed-up in the CLPF processing (measured on SSE4.2).

Change-Id: I934ad85ef2066086a44387030b42e14301b3d428
      f844e6ef
    • Steinar Midtskogen's avatar
      Retune the CLPF kernel · 4f0b3ed8
      Steinar Midtskogen authored 
      CLPF performance had degraded by about 0.5% over the past six months,
which isn't totally surprising since the codec is a moving target.
About half of that degradation comes from the improved 7 bit filter
coefficients.  Therefore, CLPF needs to be retuned for the current
codec.

This patch makes two (normative) changes to the CLPF kernel:

* The clipping function was changed from clamp(x, -s, s) to
      sign(x) * max(0, abs(x) - max(0, abs(x) - s +
             (abs(x) >> (bitdepth - 3 - log2(s)))))
  This adds a rampdown to 0 at -32 and 32 (for 8 bit, -128 & 128
  for 10 bit, etc), so large differences are ignored.

* 8 taps instead of 6 taps:
               1
    4          3
  13 31  ->  13 31
    4          3
               1

AWCY results: low delay  high delay
PSNR:           -0.40%     -0.47%
PSNR HVS:        0.00%     -0.11%
SSIM:           -0.31%     -0.39%
CIEDE 2000:     -0.22%     -0.31%
APSNR:          -0.40%     -0.48%
MS SSIM:         0.01%     -0.12%

About 3/4 of the gains come from the new clipping function.

Change-Id: Idad9dc4004e71a9c7ec81ba62ebd12fb76fb044a
      4f0b3ed8
    • Angie Chiang's avatar
      Turn on adapt_scan by default · 76ebf7ce
      Angie Chiang authored 
      Change-Id: Ibf160e83e7cb1c7dce8b40e7cbead48416440974
      76ebf7ce
    • Angie Chiang's avatar
      Exclusively uses 12-tap filter in convolve_round · 822eea32
      Angie Chiang authored 
      Performance drop by 0.084% on lowres

Change-Id: I2bcaae96b68033a0af7a1da988505623bc14ed94
      822eea32
  7. Feb 09, 2017
  9. Feb 08, 2017
  11. Feb 07, 2017
  13. Feb 06, 2017
    • Angie Chiang's avatar
      Add av1_convolve_2d_facade · 7927a97d
      Angie Chiang authored 
      When convolve_round is on, av1_convolve_2d_facade will be used for
interpolation rather than av1_convolve. Will remove the experiment
code of convolve_round experiment from av1_convolve in another CL.

So far we use 4-bit rounding in the intermediate stage on top of using
post rounding for compound mode after the last stage.

This will give us roughly 0.45% gain on lowres , 0.39% on midres and
roughly 0.6-0.7% on hdres
Altogether, is 1.15% on lowresm, 0.74% on midres and roughly 1.7-1.8% on
hdres

Note that there no restriction usage of 12-tap filter in the CL.
Adding that, we will lose roughly 0.1% again on lowres.

Change-Id: I6332e1d888e28a3b3ddc29711817d66e52cb5cdf
      7927a97d
    • Aℓex Converse's avatar
      ec_multisymbol: Split off new new_tokenset experiment · a9598cd6
      Aℓex Converse authored 
      The new_tokenset experiment replaces the unconstrained tokenset with a
multisymbol alphabet in an inventive way.

Tested configurations:
new_tokenset + ec_adapt, new_tokenset, ec_multisymbol

Change-Id: I846ab2e51c2a1dc3f2f9904ed8c47a8e98f853c5
      a9598cd6
  15. Feb 04, 2017
  17. Feb 03, 2017