[x265] [PATCH] [branches master, 3.4, 3.5] Fixes inconsistency in rskip 2 at slow presets
Srikanth Kurapati
srikanth.kurapati at multicorewareinc.com
Tue Oct 6 07:40:15 CEST 2020
>From b5b5194847c924bafcae7293d9a56fcc5a98339b Mon Sep 17 00:00:00 2001
From: Srikanth Kurapati <srikanth.kurapati at multicorewareinc.com>
Date: Wed, 30 Sep 2020 12:39:25 +0530
Subject: [PATCH] Fixes inconsistency in rskip 2 for slow presets
Considers the following based on rd levels
a) colocated CTU depth information.
b) skip decisions based on neighbour costs/residual bits.
---
doc/reST/cli.rst | 6 ++++--
source/encoder/analysis.cpp | 23 ++++++++---------------
source/test/regression-tests.txt | 2 +-
source/x265cli.cpp | 5 ++---
4 files changed, 15 insertions(+), 21 deletions(-)
diff --git a/doc/reST/cli.rst b/doc/reST/cli.rst
index 1a1de9f50..a9f77c290 100755
--- a/doc/reST/cli.rst
+++ b/doc/reST/cli.rst
@@ -854,11 +854,13 @@ the prediction quad-tree.
+----------+------------+----------------------------------------------------------------+
| RD Level | Rskip Mode | Skip Recursion Heuristic
|
+==========+============+================================================================+
- | 0 - 4 | 1 | Neighbour costs and CU homogenity.
|
+ | 0 - 4 | 1 | Neighbour costs and CU homogeneity.
|
+----------+------------+----------------------------------------------------------------+
| 5 - 6 | 1 | Comparison with inter2Nx2N.
|
+----------+------------+----------------------------------------------------------------+
- | 0 - 6 | 2 | CU edge density.
|
+ | 0 - 6 | 2 | Neighbour costs and CU edge density.
|
+
+----------+------------+----------------------------------------------------------------+
+ | 5 - 6 | 2 | Comparison with inter2Nx2N and CU edge
density. |
+----------+------------+----------------------------------------------------------------+
Provides minimal quality degradation at good performance gains for
non-zero modes.
diff --git a/source/encoder/analysis.cpp b/source/encoder/analysis.cpp
index aabf386ca..18a7b2988 100644
--- a/source/encoder/analysis.cpp
+++ b/source/encoder/analysis.cpp
@@ -1319,17 +1319,13 @@ SplitData Analysis::compressInterCU_rd0_4(const
CUData& parentCTU, const CUGeom&
skipRecursion = md.bestMode->cu.isSkipped(0);
if (mightSplit && !skipRecursion)
{
- if (depth >= minDepth && m_param->recursionSkipMode ==
RDCOST_BASED_RSKIP)
+ if (depth >= minDepth)
{
if (depth)
skipRecursion = recursionDepthCheck(parentCTU,
cuGeom, *md.bestMode);
- if (m_bHD && !skipRecursion && m_param->rdLevel == 2
&& md.fencYuv.m_size != MAX_CU_SIZE)
+ if (!skipRecursion)
skipRecursion = complexityCheckCU(*md.bestMode);
}
- else if (cuGeom.log2CUSize >= MAX_LOG2_CU_SIZE - 1 &&
m_param->recursionSkipMode == EDGE_BASED_RSKIP)
- {
- skipRecursion = complexityCheckCU(*md.bestMode);
- }
}
}
@@ -2025,8 +2021,8 @@ SplitData Analysis::compressInterCU_rd5_6(const
CUData& parentCTU, const CUGeom&
if (m_param->recursionSkipMode == RDCOST_BASED_RSKIP && depth
&& m_modeDepth[depth - 1].bestMode)
skipRecursion = md.bestMode &&
!md.bestMode->cu.getQtRootCbf(0);
- else if (cuGeom.log2CUSize >= MAX_LOG2_CU_SIZE - 1 &&
m_param->recursionSkipMode == EDGE_BASED_RSKIP)
- skipRecursion = md.bestMode &&
complexityCheckCU(*md.bestMode);
+ else if (m_param->recursionSkipMode == EDGE_BASED_RSKIP &&
(!depth || (depth && m_modeDepth[depth - 1].bestMode)))
+ skipRecursion = md.bestMode &&
(complexityCheckCU(*md.bestMode) || !md.bestMode->cu.getQtRootCbf(0));
}
if (m_param->bAnalysisType == AVC_INFO && md.bestMode &&
cuGeom.numPartitions <= 16 && m_param->analysisLoadReuseLevel == 7)
skipRecursion = true;
@@ -3535,7 +3531,7 @@ bool Analysis::recursionDepthCheck(const CUData&
parentCTU, const CUGeom& cuGeom
bool Analysis::complexityCheckCU(const Mode& bestMode)
{
- if (m_param->recursionSkipMode == RDCOST_BASED_RSKIP)
+ if (m_param->recursionSkipMode == RDCOST_BASED_RSKIP && m_bHD &&
m_param->rdLevel == 2 && bestMode.fencYuv->m_size != MAX_CU_SIZE)
{
uint32_t mean = 0;
uint32_t homo = 0;
@@ -3555,10 +3551,8 @@ bool Analysis::complexityCheckCU(const Mode&
bestMode)
if (homo < (.1 * mean))
return true;
-
- return false;
}
- else
+ else if (bestMode.fencYuv->m_size >= MAX_CU_SIZE - 1 &&
m_param->recursionSkipMode == EDGE_BASED_RSKIP)
{
int blockType = bestMode.cu.m_log2CUSize[0] - LOG2_UNIT_SIZE;
int shift = bestMode.cu.m_log2CUSize[0] * LOG2_UNIT_SIZE;
@@ -3570,11 +3564,10 @@ bool Analysis::complexityCheckCU(const Mode&
bestMode)
uint32_t pixelCount = 1 << shift;
double cuEdgeVariance = (ss - ((double)sum * sum / pixelCount)) /
pixelCount;
- if (cuEdgeVariance > (double)m_param->edgeVarThreshold)
- return false;
- else
+ if (cuEdgeVariance < (double)m_param->edgeVarThreshold)
return true;
}
+ return false;
}
uint32_t Analysis::calculateCUVariance(const CUData& ctu, const CUGeom&
cuGeom)
diff --git a/source/test/regression-tests.txt
b/source/test/regression-tests.txt
index 22673d469..23237a263 100644
--- a/source/test/regression-tests.txt
+++ b/source/test/regression-tests.txt
@@ -162,7 +162,7 @@ sintel_trailer_2k_1920x1080_24.yuv, --preset medium
--hist-scenecut --hist-thres
sintel_trailer_2k_1920x1080_24.yuv, --preset medium --hist-scenecut
--hist-threshold 0.02
sintel_trailer_2k_1920x1080_24.yuv, --preset ultrafast --hist-scenecut
--hist-threshold 0.02
crowd_run_1920x1080_50.yuv, --preset faster --ctu 32 --rskip 2
--rskip-edge-threshold 5
-crowd_run_1920x1080_50.yuv, --preset fast --ctu 64 --rskip 2
--rskip-edge-threshold 5 --aq-mode 4
+crowd_run_1920x1080_50.yuv, --preset medium --ctu 32 --rskip 2
--rskip-edge-threshold 5
crowd_run_1920x1080_50.yuv, --preset slow --ctu 32 --rskip 2
--rskip-edge-threshold 5 --hist-scenecut --hist-threshold 0.1
crowd_run_1920x1080_50.yuv, --preset slower --ctu 16 --rskip 2
--rskip-edge-threshold 5 --hist-scenecut --hist-threshold 0.1 --aq-mode 4
diff --git a/source/x265cli.cpp b/source/x265cli.cpp
index c28dd7f8c..0c74bf7b6 100755
--- a/source/x265cli.cpp
+++ b/source/x265cli.cpp
@@ -127,9 +127,8 @@ namespace X265_NS {
H0(" --[no-]ssim-rd Enable ssim rate distortion
optimization, 0 to disable. Default %s\n", OPT(param->bSsimRd));
H0(" --[no-]rd-refine Enable QP based RD refinement
for rd levels 5 and 6. Default %s\n", OPT(param->bEnableRdRefine));
H0(" --[no-]early-skip Enable early SKIP detection.
Default %s\n", OPT(param->bEnableEarlySkip));
- H0(" --rskip <mode> Set mode for early exit from
recursion. Mode 1: exit using rdcost & CU homogenity. Mode 2: exit using CU
edge density.\n"
- " Mode 0: disabled. Default
%d\n", param->recursionSkipMode);
- H1(" --rskip-edge-threshold Threshold in terms of
percentage (integer of range [0,100]) for minimum edge density in CUs used
to prun the recursion depth. Applicable only for rskip mode 2. Value is
preset dependent. Default: %.f\n", param->edgeVarThreshold*100.0f);
+ H0(" --rskip <Integer> Enable recursion skip for
early exit from CTU analysis during inter prediction. 1: exit using RD cost
& CU homogeneity. 2: exit using RD cost and CU edge density. 0: disabled.
Default %d\n", param->recursionSkipMode);
+ H1(" --rskip-edge-threshold Threshold in terms of
percentage (an integer of range [0,100]) for minimum edge density in CU's
used to prune the recursion depth. Applicable only to rskip mode 2. Value
is preset dependent. Default: %.f\n", param->edgeVarThreshold*100.0f);
H1(" --[no-]tskip-fast Enable fast intra transform
skipping. Default %s\n", OPT(param->bEnableTSkipFast));
H1(" --[no-]splitrd-skip Enable skipping split RD
analysis when sum of split CU rdCost larger than one split CU rdCost for
Intra CU. Default %s\n", OPT(param->bEnableSplitRdSkip));
H1(" --nr-intra <integer> An integer value in range of
0 to 2000, which denotes strength of noise reduction in intra CUs. Default
0\n");
--
2.20.1.windows.1
--
*With Regards,*
*Srikanth Kurapati.*
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