ref: 9c98fb2bab6125a0614576bf7635981163b1cc79
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 "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_segmentation.h"
#include "vp9/common/vp9_systemdependent.h"
#define ENERGY_MIN (-1)
#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 double q_ratio[MAX_SEGMENTS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
static double rdmult_ratio[MAX_SEGMENTS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
static int segment_id[MAX_SEGMENTS] = { 5, 3, 1, 0, 2, 4, 6, 7 };
#define Q_RATIO(i) q_ratio[(i) - ENERGY_MIN]
#define RDMULT_RATIO(i) rdmult_ratio[(i) - ENERGY_MIN]
#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);
}
double vp9_vaq_rdmult_ratio(int energy) {
ENERGY_IN_BOUNDS(energy);
vp9_clear_system_state();
return RDMULT_RATIO(energy);
}
double vp9_vaq_inv_q_ratio(int energy) {
ENERGY_IN_BOUNDS(energy);
vp9_clear_system_state();
return Q_RATIO(-energy);
}
void vp9_vaq_init() {
int i;
double base_ratio;
assert(ENERGY_SPAN <= MAX_SEGMENTS);
vp9_clear_system_state();
base_ratio = 1.5;
for (i = ENERGY_MIN; i <= ENERGY_MAX; i++) {
Q_RATIO(i) = pow(base_ratio, i/3.0);
}
}
void vp9_vaq_frame_setup(VP9_COMP *cpi) {
VP9_COMMON *cm = &cpi->common;
struct segmentation *seg = &cm->seg;
const double base_q = vp9_convert_qindex_to_q(cm->base_qindex, cm->bit_depth);
const int base_rdmult = vp9_compute_rd_mult(cpi, cm->base_qindex +
cm->y_dc_delta_q);
int i;
if (cm->frame_type == KEY_FRAME ||
cpi->refresh_alt_ref_frame ||
(cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
vp9_enable_segmentation(seg);
vp9_clearall_segfeatures(seg);
seg->abs_delta = SEGMENT_DELTADATA;
vp9_clear_system_state();
for (i = ENERGY_MIN; i <= ENERGY_MAX; i++) {
int qindex_delta, segment_rdmult;
if (Q_RATIO(i) == 1) {
// No need to enable SEG_LVL_ALT_Q for this segment
RDMULT_RATIO(i) = 1;
continue;
}
qindex_delta = vp9_compute_qdelta(&cpi->rc, base_q, base_q * Q_RATIO(i),
cm->bit_depth);
vp9_set_segdata(seg, SEGMENT_ID(i), SEG_LVL_ALT_Q, qindex_delta);
vp9_enable_segfeature(seg, SEGMENT_ID(i), SEG_LVL_ALT_Q);
segment_rdmult = vp9_compute_rd_mult(cpi, cm->base_qindex + qindex_delta +
cm->y_dc_delta_q);
RDMULT_RATIO(i) = (double) segment_rdmult / base_rdmult;
}
}
}
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) {
highbd_variance(x->plane[0].src.buf, x->plane[0].src.stride,
CONVERT_TO_BYTEPTR(vp9_highbd_64_zeros), 0, bw, bh,
&sse, &avg);
sse >>= 2 * (xd->bd - 8);
avg >>= (xd->bd - 8);
} else {
variance(x->plane[0].src.buf, x->plane[0].src.stride,
vp9_64_zeros, 0, bw, bh, &sse, &avg);
}
#else
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 - (((int64_t)avg * avg) / (bw * bh));
return (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 (256 * var) >> num_pels_log2_lookup[bs];
}
}
int vp9_block_energy(VP9_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bs) {
double energy;
unsigned int var = block_variance(cpi, x, bs);
vp9_clear_system_state();
energy = 0.9 * (log(var + 1.0) - 10.0);
return clamp((int)round(energy), ENERGY_MIN, ENERGY_MAX);
}