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/*
* Copyright (c) 2016, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include <assert.h>
#include <limits.h>
#include "config/aom_scale_rtcd.h"
#include "aom_dsp/aom_dsp_common.h"
#include "aom_dsp/psnr.h"
#include "aom_mem/aom_mem.h"
#include "aom_ports/mem.h"
#include "av1/common/av1_loopfilter.h"
#include "av1/common/onyxc_int.h"
#include "av1/common/quant_common.h"
#include "av1/encoder/av1_quantize.h"
#include "av1/encoder/encoder.h"
#include "av1/encoder/picklpf.h"
static void yv12_copy_plane(const YV12_BUFFER_CONFIG *src_bc,
YV12_BUFFER_CONFIG *dst_bc, int plane) {
switch (plane) {
case 0: aom_yv12_copy_y(src_bc, dst_bc); break;
case 1: aom_yv12_copy_u(src_bc, dst_bc); break;
case 2: aom_yv12_copy_v(src_bc, dst_bc); break;
default: assert(plane >= 0 && plane <= 2); break;
}
}
int av1_get_max_filter_level(const AV1_COMP *cpi) {
if (cpi->oxcf.pass == 2) {
return cpi->twopass.section_intra_rating > 8 ? MAX_LOOP_FILTER * 3 / 4
: MAX_LOOP_FILTER;
} else {
return MAX_LOOP_FILTER;
}
}
static int64_t try_filter_frame(const YV12_BUFFER_CONFIG *sd,
AV1_COMP *const cpi, int filt_level,
int partial_frame, int plane, int dir) {
AV1_COMMON *const cm = &cpi->common;
int64_t filt_err;
assert(plane >= 0 && plane <= 2);
int filter_level[2] = { filt_level, filt_level };
if (plane == 0 && dir == 0) filter_level[1] = cm->lf.filter_level[1];
if (plane == 0 && dir == 1) filter_level[0] = cm->lf.filter_level[0];
// set base filters for use of get_filter_level when in DELTA_Q_LF mode
switch (plane) {
case 0:
cm->lf.filter_level[0] = filter_level[0];
cm->lf.filter_level[1] = filter_level[1];
break;
case 1: cm->lf.filter_level_u = filter_level[0]; break;
case 2: cm->lf.filter_level_v = filter_level[0]; break;
}
// TODO(any): please enable multi-thread and remove the flag when loop
// filter mask is compatible with multi-thread.
#if LOOP_FILTER_BITMASK
av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, 0, plane,
plane + 1, partial_frame);
#else
if (cpi->num_workers > 1)
av1_loop_filter_frame_mt(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, plane,
plane + 1, partial_frame, cpi->workers,
cpi->num_workers, &cpi->lf_row_sync);
else
av1_loop_filter_frame(cm->frame_to_show, cm, &cpi->td.mb.e_mbd, plane,
plane + 1, partial_frame);
#endif
filt_err = aom_get_sse_plane(sd, cm->frame_to_show, plane,
cm->seq_params.use_highbitdepth);
// Re-instate the unfiltered frame
yv12_copy_plane(&cpi->last_frame_uf, cm->frame_to_show, plane);
return filt_err;
}
static int search_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi,
int partial_frame,
const int *last_frame_filter_level,
double *best_cost_ret, int plane, int dir) {
const AV1_COMMON *const cm = &cpi->common;
const int min_filter_level = 0;
const int max_filter_level = av1_get_max_filter_level(cpi);
int filt_direction = 0;
int64_t best_err;
int filt_best;
MACROBLOCK *x = &cpi->td.mb;
// Start the search at the previous frame filter level unless it is now out of
// range.
int lvl;
switch (plane) {
case 0: lvl = last_frame_filter_level[dir]; break;
case 1: lvl = last_frame_filter_level[2]; break;
case 2: lvl = last_frame_filter_level[3]; break;
default: assert(plane >= 0 && plane <= 2); return 0;
}
int filt_mid = clamp(lvl, min_filter_level, max_filter_level);
int filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
// Sum squared error at each filter level
int64_t ss_err[MAX_LOOP_FILTER + 1];
// Set each entry to -1
memset(ss_err, 0xFF, sizeof(ss_err));
yv12_copy_plane(cm->frame_to_show, &cpi->last_frame_uf, plane);
best_err = try_filter_frame(sd, cpi, filt_mid, partial_frame, plane, dir);
filt_best = filt_mid;
ss_err[filt_mid] = best_err;
while (filter_step > 0) {
const int filt_high = AOMMIN(filt_mid + filter_step, max_filter_level);
const int filt_low = AOMMAX(filt_mid - filter_step, min_filter_level);
// Bias against raising loop filter in favor of lowering it.
int64_t bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
if ((cpi->oxcf.pass == 2) && (cpi->twopass.section_intra_rating < 20))
bias = (bias * cpi->twopass.section_intra_rating) / 20;
// yx, bias less for large block size
if (cm->tx_mode != ONLY_4X4) bias >>= 1;
if (filt_direction <= 0 && filt_low != filt_mid) {
// Get Low filter error score
if (ss_err[filt_low] < 0) {
ss_err[filt_low] =
try_filter_frame(sd, cpi, filt_low, partial_frame, plane, dir);
}
// If value is close to the best so far then bias towards a lower loop
// filter value.
if (ss_err[filt_low] < (best_err + bias)) {
// Was it actually better than the previous best?
if (ss_err[filt_low] < best_err) {
best_err = ss_err[filt_low];
}
filt_best = filt_low;
}
}
// Now look at filt_high
if (filt_direction >= 0 && filt_high != filt_mid) {
if (ss_err[filt_high] < 0) {
ss_err[filt_high] =
try_filter_frame(sd, cpi, filt_high, partial_frame, plane, dir);
}
// If value is significantly better than previous best, bias added against
// raising filter value
if (ss_err[filt_high] < (best_err - bias)) {
best_err = ss_err[filt_high];
filt_best = filt_high;
}
}
// Half the step distance if the best filter value was the same as last time
if (filt_best == filt_mid) {
filter_step /= 2;
filt_direction = 0;
} else {
filt_direction = (filt_best < filt_mid) ? -1 : 1;
filt_mid = filt_best;
}
}
// Update best error
best_err = ss_err[filt_best];
if (best_cost_ret) *best_cost_ret = RDCOST_DBL(x->rdmult, 0, best_err);
return filt_best;
}
void av1_pick_filter_level(const YV12_BUFFER_CONFIG *sd, AV1_COMP *cpi,
LPF_PICK_METHOD method) {
AV1_COMMON *const cm = &cpi->common;
const int num_planes = av1_num_planes(cm);
struct loopfilter *const lf = &cm->lf;
(void)sd;
lf->sharpness_level = 0;
cpi->td.mb.rdmult = cpi->rd.RDMULT;
if (method == LPF_PICK_MINIMAL_LPF) {
lf->filter_level[0] = 0;
lf->filter_level[1] = 0;
} else if (method >= LPF_PICK_FROM_Q) {
const int min_filter_level = 0;
const int max_filter_level = av1_get_max_filter_level(cpi);
const int q = av1_ac_quant_Q3(cm->base_qindex, 0, cm->seq_params.bit_depth);
// These values were determined by linear fitting the result of the
// searched level for 8 bit depth:
// Keyframes: filt_guess = q * 0.06699 - 1.60817
// Other frames: filt_guess = q * 0.02295 + 2.48225
//
// And high bit depth separately:
// filt_guess = q * 0.316206 + 3.87252
int filt_guess;
switch (cm->seq_params.bit_depth) {
case AOM_BITS_8:
filt_guess = (cm->frame_type == KEY_FRAME)
? ROUND_POWER_OF_TWO(q * 17563 - 421574, 18)
: ROUND_POWER_OF_TWO(q * 6017 + 650707, 18);
break;
case AOM_BITS_10:
filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 4060632, 20);
break;
case AOM_BITS_12:
filt_guess = ROUND_POWER_OF_TWO(q * 20723 + 16242526, 22);
break;
default:
assert(0 &&
"bit_depth should be AOM_BITS_8, AOM_BITS_10 "
"or AOM_BITS_12");
return;
}
if (cm->seq_params.bit_depth != AOM_BITS_8 && cm->frame_type == KEY_FRAME)
filt_guess -= 4;
// TODO(chengchen): retrain the model for Y, U, V filter levels
lf->filter_level[0] = clamp(filt_guess, min_filter_level, max_filter_level);
lf->filter_level[1] = clamp(filt_guess, min_filter_level, max_filter_level);
lf->filter_level_u = clamp(filt_guess, min_filter_level, max_filter_level);
lf->filter_level_v = clamp(filt_guess, min_filter_level, max_filter_level);
} else {
const int last_frame_filter_level[4] = { lf->filter_level[0],
lf->filter_level[1],
lf->filter_level_u,
lf->filter_level_v };
lf->filter_level[0] = lf->filter_level[1] =
search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,
last_frame_filter_level, NULL, 0, 2);
lf->filter_level[0] =
search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,
last_frame_filter_level, NULL, 0, 0);
lf->filter_level[1] =
search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,
last_frame_filter_level, NULL, 0, 1);
if (num_planes > 1) {
lf->filter_level_u =
search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,
last_frame_filter_level, NULL, 1, 0);
lf->filter_level_v =
search_filter_level(sd, cpi, method == LPF_PICK_FROM_SUBIMAGE,
last_frame_filter_level, NULL, 2, 0);
}
}
}
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