mozilla
/
aom
зеркало из
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
21 202 коммитов 3 Ветки 0 Теги 64 MiB
Граф коммитов

10 Коммитов

Автор SHA1 Сообщение Дата
Alex Converse 8c687d2feb ans: Cleanup rans writing routines 
* Replace struct rans_sym parameter with values. It only had two entries.
* Document functions.
* Use longer variable names.

TODO: Refactor the unit tests.

Change-Id: Idad65117dab565786697015ef07070e1c308d963
 2017-02-13 21:01:51 +00:00
Alex Converse c54692b5ac ans: Switch from uABS to rABS 
This is in preparation for expanding the state range.

No discernible compression impact

ans_multioff@2017-01-25T20:58:18.756Z -> ans_multioff_rabs@2017-01-26T01:05:12.801Z

     PSNR | PSNR Cb | PSNR Cr | PSNR HVS |    SSIM | MS SSIM | CIEDE 2000
  -0.0001 | -0.0001 | -0.0001 |  -0.0001 | -0.0001 | -0.0001 | -0.0001

https://arewecompressedyet.com/?job=ans_multioff%402017-01-25T20%3A58%3A18.756Z&job=ans_multioff_rabs%402017-01-26T01%3A05%3A12.801Z

Change-Id: Ie1817991190f1de6d9c31e0c97f77efbd5869d35
 2017-02-04 02:40:26 +00:00
Alex Converse 822513c88c ans: Support a larger state range in reverse serialization 
Change-Id: Ic3a6f9d16a16f347fb36b94e6dca70d9436b984e
 2017-01-27 01:11:38 +00:00
Alex Converse b0be6411db ans: Use a fixed N-symbol window 
Accept a small compression loss is in exchange for a fixed sized encoder
side buffering requirement.

subset1:
rans_base@2016-12-02T22:55:56.809Z -> rans_nsym@2016-12-02T22:58:19.859Z

    PSNR | PSNR Cb | PSNR Cr | PSNR HVS |   SSIM | MS SSIM | CIEDE 2000
  0.0304 |  0.0303 |  0.0305 |   0.0317 | 0.0312 |  0.0309 |     0.0301

Change-Id: I09dd143e4f1638b97dc9bba7023efa837a7d48c7
 2016-12-12 21:28:43 +00:00
Alex Converse b0bbd60685 ans: Allow compressed buffer reversal 
The final ANS state gets further compacted because aliasing the super
frame marker is not an issue.

Change-Id: I26208accb117a6748abb6f1c32c28fadbc48de09
 2016-12-03 02:35:06 +00:00
Alex Converse fa9c9d1cc0 Adjust how the final ANS state is written. 
The new prefixes are
0: 15 bits of state are added to the base state.
10: 22 bits of state are added to the base state.
110: Reserved for super frame marker
111: 29 bits of state are added to the base state.

The likelihood of any final state is proportional to 1 / state. Given a
state range of [2**15, 2 **23) this should save on average 0.4 bits
per serialized final state.

BDRATE
subset1: -.000%
lowres: -.010%

Change-Id: I8e66e4a6667f5692c541083e6d6edc35ff411181
 2016-11-28 23:25:46 +00:00
Alex Converse 64e2f105a7 Use divide by multiply in the ans writer. 
Change-Id: Ide4e9b3a605571ec41c265347217e103df8d0821
 2016-10-21 09:54:41 -07:00
Alex Converse 62a94a649d Switch rANS to 15 bit precision, and adjust L_BASE. 
This causes rANS to operate at the same precision as the Daala EC.

aom/master stats: rans10uabs8lbase12 → rans15uabs8lbase15

objective-1-fast
PSNR YCbCr:      0.01%      0.01%      0.01%
   PSNRHVS:      0.01%
      SSIM:      0.01%
    MSSSIM:      0.01%
 CIEDE2000:      0.01%

subset1
PSNR YCbCr:     -0.01%     -0.00%     -0.00%
   PSNRHVS:     -0.01%
      SSIM:     -0.01%
    MSSSIM:     -0.01%
 CIEDE2000:     -0.01%

(cherry picked from aom/master commit ddbc2e2a68)

Change-Id: I6ef0a4f6198784b3712a61af9f105d560a22eaea
 2016-10-14 14:05:50 -07:00
Alex Converse 9ed1a2ff44 Remove custom rans types 
(cherry picked from aom/master commit 11206c60d9)

Includes renames in a bunch of places not handled by the original
due to differing tree states.

Change-Id: Ic74d9d8850b8c80a51e55e425bbf472a67e2653f
 2016-10-13 05:53:58 +00:00
Alex Converse 7fe2ae8e88 Port ANS from aom/master 25aaf40 
Reconciles the following commits from aom/master to nextgenv2:
- 25aaf40bbc
- 87073de569

Change-Id: Ideda50a6ec75485cb4fa7437c69f4e58d6a2ca73
 2016-09-28 12:07:00 -07:00