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/*
* Copyright (c) 2010 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 <assert.h>
#include <limits.h>
#include "vp9/common/vp9_onyxc_int.h"
#include "vp9/encoder/vp9_onyx_int.h"
#include "vp9/encoder/vp9_picklpf.h"
#include "vp9/encoder/vp9_quantize.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_scale/vpx_scale.h"
#include "vp9/common/vp9_alloccommon.h"
#include "vp9/common/vp9_loopfilter.h"
#include "./vpx_scale_rtcd.h"
static int get_min_filter_level(VP9_COMP *cpi, int base_qindex) {
return 0;
}
static int get_max_filter_level(VP9_COMP *cpi, int base_qindex) {
return cpi->twopass.section_intra_rating > 8 ? MAX_LOOP_FILTER * 3 / 4
: MAX_LOOP_FILTER;
}
// Stub function for now Alt LF not used
void vp9_set_alt_lf_level(VP9_COMP *cpi, int filt_val) {
}
void vp9_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi, int partial) {
MACROBLOCKD *const xd = &cpi->mb.e_mbd;
VP9_COMMON *const cm = &cpi->common;
struct loopfilter *const lf = &cm->lf;
const int min_filter_level = get_min_filter_level(cpi, cm->base_qindex);
const int max_filter_level = get_max_filter_level(cpi, cm->base_qindex);
int best_err = 0;
int filt_err = 0;
int filt_best;
int filt_direction = 0;
// Start the search at the previous frame filter level unless it is now out of
// range.
int filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level);
int filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
lf->sharpness_level = cm->frame_type == KEY_FRAME ? 0
: cpi->oxcf.sharpness;
// Make a copy of the unfiltered / processed recon buffer
vpx_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
// Get baseline error score
vp9_set_alt_lf_level(cpi, filt_mid);
vp9_loop_filter_frame(cm, xd, filt_mid, 1, partial);
best_err = vp9_calc_ss_err(sd, cm->frame_to_show);
filt_best = filt_mid;
// Re-instate the unfiltered frame
vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
while (filter_step > 0) {
const int filt_high = MIN(filt_mid + filter_step, max_filter_level);
const int filt_low = MAX(filt_mid - filter_step, min_filter_level);
// Bias against raising loop filter in favor of lowering it.
int bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
if (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
vp9_set_alt_lf_level(cpi, filt_low);
vp9_loop_filter_frame(cm, xd, filt_low, 1, partial);
filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
// Re-instate the unfiltered frame
vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
// If value is close to the best so far then bias towards a lower loop
// filter value.
if ((filt_err - bias) < best_err) {
// Was it actually better than the previous best?
if (filt_err < best_err)
best_err = filt_err;
filt_best = filt_low;
}
}
// Now look at filt_high
if (filt_direction >= 0 && filt_high != filt_mid) {
vp9_set_alt_lf_level(cpi, filt_high);
vp9_loop_filter_frame(cm, xd, filt_high, 1, partial);
filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
// Re-instate the unfiltered frame
vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
// Was it better than the previous best?
if (filt_err < (best_err - bias)) {
best_err = filt_err;
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 = filter_step / 2;
filt_direction = 0;
} else {
filt_direction = (filt_best < filt_mid) ? -1 : 1;
filt_mid = filt_best;
}
}
lf->filter_level = filt_best;
}
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