131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <assert.h>
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#include <limits.h>
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#include "vp9/common/vp9_onyxc_int.h"
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#include "vp9/encoder/vp9_onyx_int.h"
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#include "vp9/encoder/vp9_picklpf.h"
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#include "vp9/encoder/vp9_quantize.h"
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#include "vpx_mem/vpx_mem.h"
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#include "vpx_scale/vpx_scale.h"
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#include "vp9/common/vp9_alloccommon.h"
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#include "vp9/common/vp9_loopfilter.h"
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#include "./vpx_scale_rtcd.h"
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static int get_min_filter_level(VP9_COMP *cpi, int base_qindex) {
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return 0;
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}
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static int get_max_filter_level(VP9_COMP *cpi, int base_qindex) {
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return cpi->twopass.section_intra_rating > 8 ? MAX_LOOP_FILTER * 3 / 4
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: MAX_LOOP_FILTER;
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}
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// Stub function for now Alt LF not used
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void vp9_set_alt_lf_level(VP9_COMP *cpi, int filt_val) {
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}
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void vp9_pick_filter_level(YV12_BUFFER_CONFIG *sd, VP9_COMP *cpi, int partial) {
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MACROBLOCKD *const xd = &cpi->mb.e_mbd;
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VP9_COMMON *const cm = &cpi->common;
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struct loopfilter *const lf = &cm->lf;
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const int min_filter_level = get_min_filter_level(cpi, cm->base_qindex);
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const int max_filter_level = get_max_filter_level(cpi, cm->base_qindex);
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int best_err = 0;
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int filt_err = 0;
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int filt_best;
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int filt_direction = 0;
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// Start the search at the previous frame filter level unless it is now out of
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// range.
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int filt_mid = clamp(lf->filter_level, min_filter_level, max_filter_level);
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int filter_step = filt_mid < 16 ? 4 : filt_mid / 4;
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lf->sharpness_level = cm->frame_type == KEY_FRAME ? 0
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: cpi->oxcf.sharpness;
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// Make a copy of the unfiltered / processed recon buffer
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vpx_yv12_copy_y(cm->frame_to_show, &cpi->last_frame_uf);
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// Get baseline error score
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vp9_set_alt_lf_level(cpi, filt_mid);
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vp9_loop_filter_frame(cm, xd, filt_mid, 1, partial);
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best_err = vp9_calc_ss_err(sd, cm->frame_to_show);
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filt_best = filt_mid;
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// Re-instate the unfiltered frame
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vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
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while (filter_step > 0) {
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const int filt_high = MIN(filt_mid + filter_step, max_filter_level);
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const int filt_low = MAX(filt_mid - filter_step, min_filter_level);
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// Bias against raising loop filter in favor of lowering it.
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int bias = (best_err >> (15 - (filt_mid / 8))) * filter_step;
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if (cpi->twopass.section_intra_rating < 20)
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bias = bias * cpi->twopass.section_intra_rating / 20;
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// yx, bias less for large block size
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if (cm->tx_mode != ONLY_4X4)
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bias >>= 1;
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if (filt_direction <= 0 && filt_low != filt_mid) {
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// Get Low filter error score
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vp9_set_alt_lf_level(cpi, filt_low);
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vp9_loop_filter_frame(cm, xd, filt_low, 1, partial);
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filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
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// Re-instate the unfiltered frame
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vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
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// If value is close to the best so far then bias towards a lower loop
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// filter value.
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if ((filt_err - bias) < best_err) {
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// Was it actually better than the previous best?
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if (filt_err < best_err)
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best_err = filt_err;
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filt_best = filt_low;
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}
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}
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// Now look at filt_high
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if (filt_direction >= 0 && filt_high != filt_mid) {
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vp9_set_alt_lf_level(cpi, filt_high);
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vp9_loop_filter_frame(cm, xd, filt_high, 1, partial);
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filt_err = vp9_calc_ss_err(sd, cm->frame_to_show);
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// Re-instate the unfiltered frame
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vpx_yv12_copy_y(&cpi->last_frame_uf, cm->frame_to_show);
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// Was it better than the previous best?
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if (filt_err < (best_err - bias)) {
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best_err = filt_err;
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filt_best = filt_high;
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}
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}
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// Half the step distance if the best filter value was the same as last time
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if (filt_best == filt_mid) {
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filter_step = filter_step / 2;
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filt_direction = 0;
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} else {
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filt_direction = (filt_best < filt_mid) ? -1 : 1;
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filt_mid = filt_best;
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}
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}
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lf->filter_level = filt_best;
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}
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