ref: d0312379991b81f2aec5a1fa4a50406ca764cdee
parent: 3d1e8c9a85d0bb16049cb1622f1d2d9a034c5379
author: Paul Wilkins <paulwilkins@google.com>
date: Fri Nov 7 11:32:50 EST 2014
Add variance restriction to AQ2. Add an additional restriction to bit/complexity based segmentation based on spatial variance. Only lower Q when both the number of bits spent in the initial encoding pass and the spatial complexity are below a threshold. This will prevent the low Q segments being used just because there is a surfeit of bits. Small metrics gains especially opsnr. derf ~0.2% std-hd ~0.3% Change-Id: I6a8496d466d673f9b0e2b2ca6304ea7b6d8e1cce
--- a/vp9/encoder/vp9_aq_complexity.c
+++ b/vp9/encoder/vp9_aq_complexity.c
@@ -11,8 +11,9 @@
#include <limits.h>
#include <math.h>
+#include "vp9/encoder/vp9_aq_variance.h"
+#include "vp9/encoder/vp9_encodeframe.h"
#include "vp9/common/vp9_seg_common.h"
-
#include "vp9/encoder/vp9_segmentation.h"
#define AQ_C_SEGMENTS 3
@@ -22,6 +23,7 @@
{{1.0, 1.0, 1.0}, {1.0, 2.0, 1.0}, {1.0, 1.5, 2.5}};static const double aq_c_transitions[AQ_C_STRENGTHS][AQ_C_SEGMENTS] =
{{1.0, 1.0, 1.0}, {1.0, 0.25, 0.0}, {1.0, 0.5, 0.25}};+static const double aq_c_var_thresholds[AQ_C_SEGMENTS] = {100.0, 12.0, 10.0}; static int get_aq_c_strength(int q_index, vpx_bit_depth_t bit_depth) {// Approximate base quatizer (truncated to int)
@@ -94,7 +96,7 @@
// An "aq_strength" value determines how many segments are supported,
// the set of transition points to use and the extent of the quantizer
// adjustment for each segment (configured in vp9_setup_in_frame_q_adj()).
-void vp9_select_in_frame_q_segment(VP9_COMP *cpi,
+void vp9_select_in_frame_q_segment(VP9_COMP *cpi, BLOCK_SIZE bs,
int mi_row, int mi_col,
int output_enabled, int projected_rate) {VP9_COMMON *const cm = &cpi->common;
@@ -118,7 +120,11 @@
(bw * bh);
const int aq_strength = get_aq_c_strength(cm->base_qindex, cm->bit_depth);
const int active_segments = aq_c_active_segments[aq_strength];
+ double logvar;
+ vp9_setup_src_planes(&cpi->mb, cpi->Source, mi_row, mi_col);
+ logvar = vp9_log_block_var(cpi, &cpi->mb, bs);
+
// The number of segments considered and the transition points used to
// select them is determined by the "aq_strength" value.
// Currently this loop only supports segments that reduce Q (i.e. where
@@ -127,8 +133,9 @@
// with no Q adjustment.
segment = active_segments - 1;
while (segment > 0) {- if (projected_rate <
- (target_rate * aq_c_transitions[aq_strength][segment])) {+ if ((projected_rate <
+ target_rate * aq_c_transitions[aq_strength][segment]) &&
+ (logvar < aq_c_var_thresholds[segment])) {break;
}
--segment;
--- a/vp9/encoder/vp9_aq_complexity.h
+++ b/vp9/encoder/vp9_aq_complexity.h
@@ -19,9 +19,9 @@
struct VP9_COMP;
// Select a segment for the current SB64.
-void vp9_select_in_frame_q_segment(struct VP9_COMP *cpi, int mi_row, int mi_col,
+void vp9_select_in_frame_q_segment(struct VP9_COMP *cpi, BLOCK_SIZE bs,
+ int mi_row, int mi_col,
int output_enabled, int projected_rate);
-
// This function sets up a set of segments with delta Q values around
// the baseline frame quantizer.
--- a/vp9/encoder/vp9_aq_variance.c
+++ b/vp9/encoder/vp9_aq_variance.c
@@ -126,12 +126,14 @@
}
}
-int vp9_block_energy(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {- double energy;
+double vp9_log_block_var(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {unsigned int var = block_variance(cpi, x, bs);
-
vp9_clear_system_state();
+ return log(var + 1.0);
+}
- energy = 0.9 * (log(var + 1.0) - 10.0);
+int vp9_block_energy(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {+ double energy;
+ energy = 0.9 * (vp9_log_block_var(cpi, x, bs) - 10.0);
return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
}
--- a/vp9/encoder/vp9_aq_variance.h
+++ b/vp9/encoder/vp9_aq_variance.h
@@ -22,6 +22,7 @@
void vp9_vaq_frame_setup(VP9_COMP *cpi);
int vp9_block_energy(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs);
+double vp9_log_block_var(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs);
#ifdef __cplusplus
} // extern "C"
--- a/vp9/encoder/vp9_encodeframe.c
+++ b/vp9/encoder/vp9_encodeframe.c
@@ -1699,7 +1699,7 @@
// and and if necessary apply a Q delta using segmentation to get
// closer to the target.
if ((cpi->oxcf.aq_mode == COMPLEXITY_AQ) && cm->seg.update_map) {- vp9_select_in_frame_q_segment(cpi, mi_row, mi_col,
+ vp9_select_in_frame_q_segment(cpi, bsize, mi_row, mi_col,
output_enabled, chosen_rdc.rate);
}
encode_sb(cpi, tile_info, tp, mi_row, mi_col, output_enabled, bsize,
@@ -2438,7 +2438,7 @@
// and and if necessary apply a Q delta using segmentation to get
// closer to the target.
if ((cpi->oxcf.aq_mode == COMPLEXITY_AQ) && cm->seg.update_map)
- vp9_select_in_frame_q_segment(cpi, mi_row, mi_col, output_enabled,
+ vp9_select_in_frame_q_segment(cpi, bsize, mi_row, mi_col, output_enabled,
best_rdc.rate);
encode_sb(cpi, tile_info, tp, mi_row, mi_col, output_enabled,
bsize, pc_tree);
@@ -2943,7 +2943,7 @@
// and and if necessary apply a Q delta using segmentation to get
// closer to the target.
if ((oxcf->aq_mode == COMPLEXITY_AQ) && cm->seg.update_map) {- vp9_select_in_frame_q_segment(cpi, mi_row, mi_col, output_enabled,
+ vp9_select_in_frame_q_segment(cpi, bsize, mi_row, mi_col, output_enabled,
best_rdc.rate);
}
encode_sb_rt(cpi, tile_info, tp, mi_row, mi_col, output_enabled,
--
⑨