ref: 59c9e1d87ef33bc82fca82cfcf5202d4b86c92e7
dir: /vp9/encoder/vp9_aq_variance.c/
/*
* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <math.h>
#include "vpx_ports/mem.h"
#include "vpx_ports/system_state.h"
#include "vp9/encoder/vp9_aq_variance.h"
#include "vp9/common/vp9_seg_common.h"
#include "vp9/encoder/vp9_ratectrl.h"
#include "vp9/encoder/vp9_rd.h"
#include "vp9/encoder/vp9_encodeframe.h"
#include "vp9/encoder/vp9_segmentation.h"
#define ENERGY_MIN (-4)
#define ENERGY_MAX (1)
#define ENERGY_SPAN (ENERGY_MAX - ENERGY_MIN + 1)
#define ENERGY_IN_BOUNDS(energy) \
assert((energy) >= ENERGY_MIN && (energy) <= ENERGY_MAX)
static const double rate_ratio[MAX_SEGMENTS] = { 2.5, 2.0, 1.5, 1.0,
0.75, 1.0, 1.0, 1.0 };
static const int segment_id[ENERGY_SPAN] = { 0, 1, 1, 2, 3, 4 };
#define SEGMENT_ID(i) segment_id[(i)-ENERGY_MIN]
DECLARE_ALIGNED(16, static const uint8_t, vp9_64_zeros[64]) = { 0 };
#if CONFIG_VP9_HIGHBITDEPTH
DECLARE_ALIGNED(16, static const uint16_t, vp9_highbd_64_zeros[64]) = { 0 };
#endif
unsigned int vp9_vaq_segment_id(int energy) {
ENERGY_IN_BOUNDS(energy);
return SEGMENT_ID(energy);
}
void vp9_vaq_frame_setup(VP9_COMP *cpi) {
VP9_COMMON *cm = &cpi->common;
struct segmentation *seg = &cm->seg;
int i;
if (frame_is_intra_only(cm) || cm->error_resilient_mode ||
cpi->refresh_alt_ref_frame || cpi->force_update_segmentation ||
(cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
vp9_enable_segmentation(seg);
vp9_clearall_segfeatures(seg);
seg->abs_delta = SEGMENT_DELTADATA;
vpx_clear_system_state();
for (i = 0; i < MAX_SEGMENTS; ++i) {
int qindex_delta =
vp9_compute_qdelta_by_rate(&cpi->rc, cm->frame_type, cm->base_qindex,
rate_ratio[i], cm->bit_depth);
// We don't allow qindex 0 in a segment if the base value is not 0.
// Q index 0 (lossless) implies 4x4 encoding only and in AQ mode a segment
// Q delta is sometimes applied without going back around the rd loop.
// This could lead to an illegal combination of partition size and q.
if ((cm->base_qindex != 0) && ((cm->base_qindex + qindex_delta) == 0)) {
qindex_delta = -cm->base_qindex + 1;
}
// No need to enable SEG_LVL_ALT_Q for this segment.
if (rate_ratio[i] == 1.0) {
continue;
}
vp9_set_segdata(seg, i, SEG_LVL_ALT_Q, qindex_delta);
vp9_enable_segfeature(seg, i, SEG_LVL_ALT_Q);
}
}
}
/* TODO(agrange, paulwilkins): The block_variance calls the unoptimized versions
* of variance() and highbd_8_variance(). It should not.
*/
static void aq_variance(const uint8_t *a, int a_stride, const uint8_t *b,
int b_stride, int w, int h, unsigned int *sse,
int *sum) {
int i, j;
*sum = 0;
*sse = 0;
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
const int diff = a[j] - b[j];
*sum += diff;
*sse += diff * diff;
}
a += a_stride;
b += b_stride;
}
}
#if CONFIG_VP9_HIGHBITDEPTH
static void aq_highbd_variance64(const uint8_t *a8, int a_stride,
const uint8_t *b8, int b_stride, int w, int h,
uint64_t *sse, int64_t *sum) {
int i, j;
uint16_t *a = CONVERT_TO_SHORTPTR(a8);
uint16_t *b = CONVERT_TO_SHORTPTR(b8);
*sum = 0;
*sse = 0;
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
const int diff = a[j] - b[j];
*sum += diff;
*sse += diff * diff;
}
a += a_stride;
b += b_stride;
}
}
#endif // CONFIG_VP9_HIGHBITDEPTH
static unsigned int block_variance(VP9_COMP *cpi, MACROBLOCK *x,
BLOCK_SIZE bs) {
MACROBLOCKD *xd = &x->e_mbd;
unsigned int var, sse;
int right_overflow =
(xd->mb_to_right_edge < 0) ? ((-xd->mb_to_right_edge) >> 3) : 0;
int bottom_overflow =
(xd->mb_to_bottom_edge < 0) ? ((-xd->mb_to_bottom_edge) >> 3) : 0;
if (right_overflow || bottom_overflow) {
const int bw = 8 * num_8x8_blocks_wide_lookup[bs] - right_overflow;
const int bh = 8 * num_8x8_blocks_high_lookup[bs] - bottom_overflow;
int avg;
#if CONFIG_VP9_HIGHBITDEPTH
if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
uint64_t sse64 = 0;
int64_t sum64 = 0;
aq_highbd_variance64(x->plane[0].src.buf, x->plane[0].src.stride,
CONVERT_TO_BYTEPTR(vp9_highbd_64_zeros), 0, bw, bh,
&sse64, &sum64);
sse = (unsigned int)(sse64 >> (2 * (xd->bd - 8)));
avg = (int)(sum64 >> (xd->bd - 8));
} else {
aq_variance(x->plane[0].src.buf, x->plane[0].src.stride, vp9_64_zeros, 0,
bw, bh, &sse, &avg);
}
#else
aq_variance(x->plane[0].src.buf, x->plane[0].src.stride, vp9_64_zeros, 0,
bw, bh, &sse, &avg);
#endif // CONFIG_VP9_HIGHBITDEPTH
var = sse - (unsigned int)(((int64_t)avg * avg) / (bw * bh));
return (unsigned int)(((uint64_t)256 * var) / (bw * bh));
} else {
#if CONFIG_VP9_HIGHBITDEPTH
if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
var =
cpi->fn_ptr[bs].vf(x->plane[0].src.buf, x->plane[0].src.stride,
CONVERT_TO_BYTEPTR(vp9_highbd_64_zeros), 0, &sse);
} else {
var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf, x->plane[0].src.stride,
vp9_64_zeros, 0, &sse);
}
#else
var = cpi->fn_ptr[bs].vf(x->plane[0].src.buf, x->plane[0].src.stride,
vp9_64_zeros, 0, &sse);
#endif // CONFIG_VP9_HIGHBITDEPTH
return (unsigned int)(((uint64_t)256 * var) >> num_pels_log2_lookup[bs]);
}
}
double vp9_log_block_var(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
unsigned int var = block_variance(cpi, x, bs);
vpx_clear_system_state();
return log(var + 1.0);
}
#define DEFAULT_E_MIDPOINT 10.0
static int scale_block_energy(VP9_COMP *cpi, unsigned int block_var) {
double energy;
double energy_midpoint;
energy_midpoint =
(cpi->oxcf.pass == 2) ? cpi->twopass.mb_av_energy : DEFAULT_E_MIDPOINT;
energy = log(block_var + 1.0) - energy_midpoint;
return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
}
#undef DEFAULT_E_MIDPOINT
// Get the range of sub block energy values;
void vp9_get_sub_block_energy(VP9_COMP *cpi, MACROBLOCK *mb, int mi_row,
int mi_col, BLOCK_SIZE bsize, int *min_e,
int *max_e) {
VP9_COMMON *const cm = &cpi->common;
const int bw = num_8x8_blocks_wide_lookup[bsize];
const int bh = num_8x8_blocks_high_lookup[bsize];
const int xmis = VPXMIN(cm->mi_cols - mi_col, bw);
const int ymis = VPXMIN(cm->mi_rows - mi_row, bh);
int x, y;
if (xmis < bw || ymis < bh) {
vp9_setup_src_planes(mb, cpi->Source, mi_row, mi_col);
*min_e = vp9_block_energy(cpi, mb, bsize);
*max_e = *min_e;
} else {
unsigned int var;
// Because scale_block_energy is non-decreasing, we can find the min/max
// block variance and scale afterwards. This avoids a costly scaling at
// every iteration.
unsigned int min_var = UINT_MAX;
unsigned int max_var = 0;
for (y = 0; y < ymis; ++y) {
for (x = 0; x < xmis; ++x) {
vp9_setup_src_planes(mb, cpi->Source, mi_row + y, mi_col + x);
vpx_clear_system_state();
var = block_variance(cpi, mb, BLOCK_8X8);
vpx_clear_system_state();
min_var = VPXMIN(min_var, var);
max_var = VPXMAX(max_var, var);
}
}
*min_e = scale_block_energy(cpi, min_var);
*max_e = scale_block_energy(cpi, max_var);
}
// Re-instate source pointers back to what they should have been on entry.
vp9_setup_src_planes(mb, cpi->Source, mi_row, mi_col);
}
int vp9_block_energy(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
unsigned int var;
vpx_clear_system_state();
var = block_variance(cpi, x, bs);
vpx_clear_system_state();
return scale_block_energy(cpi, var);
}