Jingning Han [Mon, 25 Mar 2019 18:27:14 +0000 (11:27 -0700)]
Unify the transform and quantization process
Unify the transform and quantization process for 4x4 - 16x16
transform block sizes. This doesn't affect the encoding speed
visibly. Remove it to reduce the maintenance load.
Jerome Jiang [Thu, 21 Mar 2019 21:17:15 +0000 (14:17 -0700)]
vp9 postproc neon: Remove the condition on mb cols.
VP8 and VP9 have different padding on buffer stride.
VP8 microblock is 16x16 so the buffer stride needs to be divisible by
16. Thus UV buffer stride is divisible by 8.
VP9 microblock is 8x8 so the buffer stride is only extended to be
divisible by 8. Then UV buffer stride isn't divisible by 8.
Marco Paniconi [Thu, 21 Mar 2019 17:36:31 +0000 (10:36 -0700)]
vp9-screen: Adjust speed features at speed 8
Keep loopfilter on, and use half-pel instead of full.
This reduces big quality gap between the speed 8 and 7,
but still keeps speed 8 about 30-40% faster than speed 7.
Tested on screenshare clips with scroll and slide changes.
Marco Paniconi [Wed, 20 Mar 2019 20:39:48 +0000 (13:39 -0700)]
vp9-rtc: Fixes for low-resoln
The force smooth_filter should only be used
for noisy content, so for now keep it off and
add TODO. Also fix/adjust low-resoln condition
and threshold in cyclic refresh.
Marco Paniconi [Fri, 15 Mar 2019 16:13:45 +0000 (09:13 -0700)]
vp9-rtc: Adjustments for base layer in screen.
On scene/content changes for base layer of screen:
reduce 32x32 split threshold, bias rdcost for flat
blocks if sse_y is non-zero, and avoid early exit on
intra-check.
Paul Wilkins [Wed, 13 Mar 2019 16:20:23 +0000 (16:20 +0000)]
Improve key frame detection
Improve detection of key frames especially in low contrast
and low motion regions.
This patch adds a function to the key frame detection to test
for specific patterns in the intra signal in the first pass stats
that tend to be indicative of a key frame.
This is intended to compliment the existing code and finds some
scene cuts that were previously being misssed.
Tested on two clips where the existing code was struggling to
identify the key frames this patch improved detection as follows.
Film clip 1: (detected / actual)
Old (2/5) New (5/5)
Film Clip 2
Old 4/11 and one false +, New 7/11 and 1 false +.
Short 4K Film Scene
Old 1/2 New 2/2
In testing so far I have not seen many extra false +'s though
it is likely that there will be some cases and this may need
further tweaking.
One one of our longer form film test reels ~20k frames)
the change picked up around 35 key frames that were
previously missed, mainly in darker scenes. There were a few
extra (or different) false positives cause by bright flashes or
explosions but these were cases where there was little
difference between inter and intra coding.
Marco Paniconi [Fri, 15 Mar 2019 00:27:58 +0000 (17:27 -0700)]
vp9-rtc: Some adjustments for low-resolns real-time
Force smooth_interpol filter for low resolutions at high Q,
avoid the loopfilter strength reduction for similar conditon,
and reduce thresh_motion for cyclic refresh turnoff.
Jingning Han [Thu, 14 Mar 2019 15:28:44 +0000 (08:28 -0700)]
Refactor tile boundary condition for intra prediction
Explicitly compare the block location against tile coordinate to
decide if intra prediction boundary is available. No coding stats
will be changed by this refactoring.
Marco Paniconi [Wed, 13 Mar 2019 20:46:12 +0000 (13:46 -0700)]
vp9-svc: Reorganize the simulcast mode
Set the lst/gld/alt_fb_idx and refresh flags for
key frames at the start of encoding (in svc_set_params).
This then avoids new code/function in update_references()
and in copy_flags_ref_update().
Jingning Han [Tue, 5 Mar 2019 18:45:16 +0000 (10:45 -0800)]
Set up Wiener variance for macroblocks in a frame
This commit introduces a Wiener variance term. For each block in
the source frame, we first estimate its film grain noise level
using median filter in the transform domain. Each transform
coefficient is then processed using Wiener filter to account for
the impact on the energy level due to film grain noise. The result
leads to a second moment of the denoised signal.
Paul Wilkins [Thu, 28 Feb 2019 14:10:12 +0000 (14:10 +0000)]
Change to mode early breakout rules for FILM mode.
The biggest offender in terms of preventing retention of film
grain in high rate film content is the use of DC-PRED mode.
Some of the directional modes whilst not strictly preserving
grain do better at at least preserving some texture.
This change blocks the early breakout of the rd loop based
on the reference frame giving the best result so far. In practice,
unless DC-PRED was chosen as the best mode so far, the other
directional intra modes would not even be considered.
As the film grain mode also tends to bias against DC-PRED (or
intra in general) this was pretty much blocking all use of directional
intra modes.
The patch also allows for a broader spectrum of DC modes at the
16x16 transform level than previously.
Marco Paniconi [Sat, 9 Mar 2019 05:00:48 +0000 (21:00 -0800)]
vp9-screen: Rework the mode skip logic for screen
Don't force skip of zero-golden reference when
zero_temp_sad_source = 0, as it be may the
inter-layer reference. And remove the flatness conditon
when superblock is static.
Marco Paniconi [Fri, 8 Mar 2019 18:04:31 +0000 (10:04 -0800)]
vp9-screen: Fix to screen wth layered encoding
zero_temp_sad_source is only computed when
compute_source_sad_onepass and sf->use_source_sad are
on, which currently is only for the top layer of the
layered encoding. So qualify the usage of
zero_temp_sad_source on those flags.
This affects the quality/speed of the lower layers of
screen content mode when SVC (quality layers) are used.
Marco Paniconi [Thu, 7 Mar 2019 04:28:26 +0000 (20:28 -0800)]
vp9-rtc: Improve mode check on flat blocks in screen mode
For nonrd-pickmode in screen content mode: modify logic for
inter and intra mode check for spatially flat blocks.
Condition skip of non-zero/zero inter mode based on
zero_temp_sad_source, and force intra/DC check regardless.
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